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gecko-dev/widget/nsIWidget.h

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/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsIWidget_h__
#define nsIWidget_h__
#include "nsISupports.h"
#include "nsColor.h"
#include "nsRect.h"
#include "nsStringGlue.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
#include "nsWidgetInitData.h"
#include "nsTArray.h"
#include "nsITheme.h"
#include "nsITimer.h"
#include "nsXULAppAPI.h"
#include "mozilla/EventForwards.h"
#include "mozilla/layers/LayersTypes.h"
#include "mozilla/RefPtr.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/gfx/Point.h"
#include "nsDataHashtable.h"
#include "nsIObserver.h"
#include "Units.h"
// forward declarations
class nsIRollupListener;
class imgIContainer;
class nsIContent;
class ViewWrapper;
class nsIWidgetListener;
class nsIntRegion;
class nsIScreen;
namespace mozilla {
class CompositorVsyncDispatcher;
namespace dom {
class TabChild;
}
namespace plugins {
class PluginWidgetChild;
}
namespace layers {
class Composer2D;
class CompositorChild;
class LayerManager;
class LayerManagerComposite;
class PLayerTransactionChild;
struct ScrollableLayerGuid;
}
namespace gfx {
class DrawTarget;
}
namespace widget {
class TextEventDispatcher;
}
}
/**
* Callback function that processes events.
*
* The argument is actually a subtype (subclass) of WidgetEvent which carries
* platform specific information about the event. Platform specific code
* knows how to deal with it.
*
* The return value determines whether or not the default action should take
* place.
*/
typedef nsEventStatus (* EVENT_CALLBACK)(mozilla::WidgetGUIEvent* aEvent);
// Hide the native window system's real window type so as to avoid
// including native window system types and APIs. This is necessary
// to ensure cross-platform code.
typedef void* nsNativeWidget;
/**
* Flags for the GetNativeData and SetNativeData functions
*/
#define NS_NATIVE_WINDOW 0
#define NS_NATIVE_GRAPHIC 1
#define NS_NATIVE_TMP_WINDOW 2
#define NS_NATIVE_WIDGET 3
#define NS_NATIVE_DISPLAY 4
#define NS_NATIVE_REGION 5
#define NS_NATIVE_OFFSETX 6
#define NS_NATIVE_OFFSETY 7
#define NS_NATIVE_PLUGIN_PORT 8
#define NS_NATIVE_SCREEN 9
// The toplevel GtkWidget containing this nsIWidget:
#define NS_NATIVE_SHELLWIDGET 10
// Has to match to NPNVnetscapeWindow, and shareable across processes
// HWND on Windows and XID on X11
#define NS_NATIVE_SHAREABLE_WINDOW 11
#define NS_NATIVE_OPENGL_CONTEXT 12
#ifdef XP_MACOSX
#define NS_NATIVE_PLUGIN_PORT_QD 100
#define NS_NATIVE_PLUGIN_PORT_CG 101
#endif
#ifdef XP_WIN
#define NS_NATIVE_TSF_THREAD_MGR 100
#define NS_NATIVE_TSF_CATEGORY_MGR 101
#define NS_NATIVE_TSF_DISPLAY_ATTR_MGR 102
#define NS_NATIVE_ICOREWINDOW 103 // winrt specific
#endif
#if defined(MOZ_WIDGET_GTK)
// set/get nsPluginNativeWindowGtk, e10s specific
#define NS_NATIVE_PLUGIN_OBJECT_PTR 104
#endif
// See RegisterPluginWindowForRemoteUpdates
#define NS_NATIVE_PLUGIN_ID 105
#define NS_IWIDGET_IID \
{ 0x316E4600, 0x15DB, 0x47AE, \
{ 0xBF, 0xE4, 0x5B, 0xCD, 0xFF, 0x80, 0x80, 0x83 } };
/*
* Window shadow styles
* Also used for the -moz-window-shadow CSS property
*/
#define NS_STYLE_WINDOW_SHADOW_NONE 0
#define NS_STYLE_WINDOW_SHADOW_DEFAULT 1
#define NS_STYLE_WINDOW_SHADOW_MENU 2
#define NS_STYLE_WINDOW_SHADOW_TOOLTIP 3
#define NS_STYLE_WINDOW_SHADOW_SHEET 4
/**
* Transparency modes
*/
enum nsTransparencyMode {
eTransparencyOpaque = 0, // Fully opaque
eTransparencyTransparent, // Parts of the window may be transparent
eTransparencyGlass, // Transparent parts of the window have Vista AeroGlass effect applied
eTransparencyBorderlessGlass // As above, but without a border around the opaque areas when there would otherwise be one with eTransparencyGlass
};
/**
* Cursor types.
*/
enum nsCursor { ///(normal cursor, usually rendered as an arrow)
eCursor_standard,
///(system is busy, usually rendered as a hourglass or watch)
eCursor_wait,
///(Selecting something, usually rendered as an IBeam)
eCursor_select,
///(can hyper-link, usually rendered as a human hand)
eCursor_hyperlink,
///(north/south/west/east edge sizing)
eCursor_n_resize,
eCursor_s_resize,
eCursor_w_resize,
eCursor_e_resize,
///(corner sizing)
eCursor_nw_resize,
eCursor_se_resize,
eCursor_ne_resize,
eCursor_sw_resize,
eCursor_crosshair,
eCursor_move,
eCursor_help,
eCursor_copy, // CSS3
eCursor_alias,
eCursor_context_menu,
eCursor_cell,
eCursor_grab,
eCursor_grabbing,
eCursor_spinning,
eCursor_zoom_in,
eCursor_zoom_out,
eCursor_not_allowed,
eCursor_col_resize,
eCursor_row_resize,
eCursor_no_drop,
eCursor_vertical_text,
eCursor_all_scroll,
eCursor_nesw_resize,
eCursor_nwse_resize,
eCursor_ns_resize,
eCursor_ew_resize,
eCursor_none,
// This one better be the last one in this list.
eCursorCount
};
enum nsTopLevelWidgetZPlacement { // for PlaceBehind()
eZPlacementBottom = 0, // bottom of the window stack
eZPlacementBelow, // just below another widget
eZPlacementTop // top of the window stack
};
/**
* Before the OS goes to sleep, this topic is notified.
*/
#define NS_WIDGET_SLEEP_OBSERVER_TOPIC "sleep_notification"
/**
* After the OS wakes up, this topic is notified.
*/
#define NS_WIDGET_WAKE_OBSERVER_TOPIC "wake_notification"
/**
* Before the OS suspends the current process, this topic is notified. Some
* OS will kill processes that are suspended instead of resuming them.
* For that reason this topic may be useful to safely close down resources.
*/
#define NS_WIDGET_SUSPEND_PROCESS_OBSERVER_TOPIC "suspend_process_notification"
/**
* After the current process resumes from being suspended, this topic is
* notified.
*/
#define NS_WIDGET_RESUME_PROCESS_OBSERVER_TOPIC "resume_process_notification"
/**
* Preference for receiving IME updates
*
* If mWantUpdates is not NOTIFY_NOTHING, nsTextStateManager will observe text
* change and/or selection change and call nsIWidget::NotifyIME() with
* NOTIFY_IME_OF_SELECTION_CHANGE and/or NOTIFY_IME_OF_TEXT_CHANGE.
* Please note that the text change observing cost is very expensive especially
* on an HTML editor has focus.
* If the IME implementation on a particular platform doesn't care about
* NOTIFY_IME_OF_SELECTION_CHANGE and/or NOTIFY_IME_OF_TEXT_CHANGE,
* they should set mWantUpdates to NOTIFY_NOTHING to avoid the cost.
* If the IME implementation needs notifications even while our process is
* deactive, it should also set NOTIFY_DURING_DEACTIVE.
*/
struct nsIMEUpdatePreference {
typedef uint8_t Notifications;
enum : Notifications
{
NOTIFY_NOTHING = 0,
NOTIFY_SELECTION_CHANGE = 1 << 0,
NOTIFY_TEXT_CHANGE = 1 << 1,
NOTIFY_POSITION_CHANGE = 1 << 2,
// NOTIFY_MOUSE_BUTTON_EVENT_ON_CHAR is used when mouse button is pressed
// or released on a character in the focused editor. The notification is
// notified to IME as a mouse event. If it's consumed by IME, NotifyIME()
// returns NS_SUCCESS_EVENT_CONSUMED. Otherwise, it returns NS_OK if it's
// handled without any error.
NOTIFY_MOUSE_BUTTON_EVENT_ON_CHAR = 1 << 3,
// Following values indicate when widget needs or doesn't need notification.
NOTIFY_CHANGES_CAUSED_BY_COMPOSITION = 1 << 6,
// NOTE: NOTIFY_DURING_DEACTIVE isn't supported in environments where two
// or more compositions are possible. E.g., Mac and Linux (GTK).
NOTIFY_DURING_DEACTIVE = 1 << 7,
// Changes are notified in following conditions if the instance is
// just constructed. If some platforms don't need change notifications
// in some of following conditions, the platform should remove following
// flags before returing the instance from nsIWidget::GetUpdatePreference().
DEFAULT_CONDITIONS_OF_NOTIFYING_CHANGES =
NOTIFY_CHANGES_CAUSED_BY_COMPOSITION
};
nsIMEUpdatePreference()
: mWantUpdates(DEFAULT_CONDITIONS_OF_NOTIFYING_CHANGES)
{
}
explicit nsIMEUpdatePreference(Notifications aWantUpdates)
: mWantUpdates(aWantUpdates | DEFAULT_CONDITIONS_OF_NOTIFYING_CHANGES)
{
}
void DontNotifyChangesCausedByComposition()
{
mWantUpdates &= ~DEFAULT_CONDITIONS_OF_NOTIFYING_CHANGES;
}
bool WantSelectionChange() const
{
return !!(mWantUpdates & NOTIFY_SELECTION_CHANGE);
}
bool WantTextChange() const
{
return !!(mWantUpdates & NOTIFY_TEXT_CHANGE);
}
bool WantPositionChanged() const
{
return !!(mWantUpdates & NOTIFY_POSITION_CHANGE);
}
bool WantChanges() const
{
return WantSelectionChange() || WantTextChange();
}
bool WantMouseButtonEventOnChar() const
{
return !!(mWantUpdates & NOTIFY_MOUSE_BUTTON_EVENT_ON_CHAR);
}
bool WantChangesCausedByComposition() const
{
return WantChanges() &&
!!(mWantUpdates & NOTIFY_CHANGES_CAUSED_BY_COMPOSITION);
}
bool WantDuringDeactive() const
{
return !!(mWantUpdates & NOTIFY_DURING_DEACTIVE);
}
Notifications mWantUpdates;
};
/*
* Contains IMEStatus plus information about the current
* input context that the IME can use as hints if desired.
*/
namespace mozilla {
namespace widget {
struct IMEState {
/**
* IME enabled states, the mEnabled value of
* SetInputContext()/GetInputContext() should be one value of following
* values.
*
* WARNING: If you change these values, you also need to edit:
* nsIDOMWindowUtils.idl
* nsContentUtils::GetWidgetStatusFromIMEStatus
*/
enum Enabled {
/**
* 'Disabled' means the user cannot use IME. So, the IME open state should
* be 'closed' during 'disabled'.
*/
DISABLED,
/**
* 'Enabled' means the user can use IME.
*/
ENABLED,
/**
* 'Password' state is a special case for the password editors.
* E.g., on mac, the password editors should disable the non-Roman
* keyboard layouts at getting focus. Thus, the password editor may have
* special rules on some platforms.
*/
PASSWORD,
/**
* This state is used when a plugin is focused.
* When a plug-in is focused content, we should send native events
* directly. Because we don't process some native events, but they may
* be needed by the plug-in.
*/
PLUGIN
};
Enabled mEnabled;
/**
* IME open states the mOpen value of SetInputContext() should be one value of
* OPEN, CLOSE or DONT_CHANGE_OPEN_STATE. GetInputContext() should return
* OPEN, CLOSE or OPEN_STATE_NOT_SUPPORTED.
*/
enum Open {
/**
* 'Unsupported' means the platform cannot return actual IME open state.
* This value is used only by GetInputContext().
*/
OPEN_STATE_NOT_SUPPORTED,
/**
* 'Don't change' means the widget shouldn't change IME open state when
* SetInputContext() is called.
*/
DONT_CHANGE_OPEN_STATE = OPEN_STATE_NOT_SUPPORTED,
/**
* 'Open' means that IME should compose in its primary language (or latest
* input mode except direct ASCII character input mode). Even if IME is
* opened by this value, users should be able to close IME by theirselves.
* Web contents can specify this value by |ime-mode: active;|.
*/
OPEN,
/**
* 'Closed' means that IME shouldn't handle key events (or should handle
* as ASCII character inputs on mobile device). Even if IME is closed by
* this value, users should be able to open IME by theirselves.
* Web contents can specify this value by |ime-mode: inactive;|.
*/
CLOSED
};
Open mOpen;
IMEState() : mEnabled(ENABLED), mOpen(DONT_CHANGE_OPEN_STATE) { }
explicit IMEState(Enabled aEnabled, Open aOpen = DONT_CHANGE_OPEN_STATE) :
mEnabled(aEnabled), mOpen(aOpen)
{
}
// Returns true if the user can input characters.
// This means that a plain text editor, an HTML editor, a password editor or
// a plain text editor whose ime-mode is "disabled".
bool IsEditable() const
{
return mEnabled == ENABLED || mEnabled == PASSWORD;
}
// Returns true if the user might be able to input characters.
// This means that a plain text editor, an HTML editor, a password editor,
// a plain text editor whose ime-mode is "disabled" or a windowless plugin
// has focus.
bool MaybeEditable() const
{
return IsEditable() || mEnabled == PLUGIN;
}
};
struct InputContext {
InputContext()
: mNativeIMEContext(nullptr)
, mOrigin(XRE_IsParentProcess() ? ORIGIN_MAIN : ORIGIN_CONTENT)
{}
bool IsPasswordEditor() const
{
return mHTMLInputType.LowerCaseEqualsLiteral("password");
}
IMEState mIMEState;
/* The type of the input if the input is a html input field */
nsString mHTMLInputType;
/* The type of the inputmode */
nsString mHTMLInputInputmode;
/* A hint for the action that is performed when the input is submitted */
nsString mActionHint;
/* Native IME context for the widget. This doesn't come from the argument of
SetInputContext(). If there is only one context in the process, this may
be nullptr. */
void* mNativeIMEContext;
/**
* mOrigin indicates whether this focus event refers to main or remote content.
*/
enum Origin
{
// Adjusting focus of content on the main process
ORIGIN_MAIN,
// Adjusting focus of content in a remote process
ORIGIN_CONTENT
};
Origin mOrigin;
bool IsOriginMainProcess() const
{
return mOrigin == ORIGIN_MAIN;
}
bool IsOriginContentProcess() const
{
return mOrigin == ORIGIN_CONTENT;
}
bool IsOriginCurrentProcess() const
{
if (XRE_IsParentProcess()) {
return IsOriginMainProcess();
}
return IsOriginContentProcess();
}
};
struct InputContextAction {
/**
* mCause indicates what action causes calling nsIWidget::SetInputContext().
* It must be one of following values.
*/
enum Cause {
// The cause is unknown but originated from content. Focus might have been
// changed by content script.
CAUSE_UNKNOWN,
// The cause is unknown but originated from chrome. Focus might have been
// changed by chrome script.
CAUSE_UNKNOWN_CHROME,
// The cause is user's keyboard operation.
CAUSE_KEY,
// The cause is user's mouse operation.
CAUSE_MOUSE
};
Cause mCause;
/**
* mFocusChange indicates what happened for focus.
*/
enum FocusChange {
FOCUS_NOT_CHANGED,
// A content got focus.
GOT_FOCUS,
// Focused content lost focus.
LOST_FOCUS,
// Menu got pseudo focus that means focused content isn't changed but
// keyboard events will be handled by menu.
MENU_GOT_PSEUDO_FOCUS,
// Menu lost pseudo focus that means focused content will handle keyboard
// events.
MENU_LOST_PSEUDO_FOCUS
};
FocusChange mFocusChange;
bool ContentGotFocusByTrustedCause() const {
return (mFocusChange == GOT_FOCUS &&
mCause != CAUSE_UNKNOWN);
}
bool UserMightRequestOpenVKB() const {
return (mFocusChange == FOCUS_NOT_CHANGED &&
mCause == CAUSE_MOUSE);
}
InputContextAction() :
mCause(CAUSE_UNKNOWN), mFocusChange(FOCUS_NOT_CHANGED)
{
}
explicit InputContextAction(Cause aCause,
FocusChange aFocusChange = FOCUS_NOT_CHANGED) :
mCause(aCause), mFocusChange(aFocusChange)
{
}
};
/**
* Size constraints for setting the minimum and maximum size of a widget.
* Values are in device pixels.
*/
struct SizeConstraints {
SizeConstraints()
: mMaxSize(NS_MAXSIZE, NS_MAXSIZE)
{
}
SizeConstraints(mozilla::LayoutDeviceIntSize aMinSize,
mozilla::LayoutDeviceIntSize aMaxSize)
: mMinSize(aMinSize),
mMaxSize(aMaxSize)
{
}
mozilla::LayoutDeviceIntSize mMinSize;
mozilla::LayoutDeviceIntSize mMaxSize;
};
// IMEMessage is shared by IMEStateManager and TextComposition.
// Update values in GeckoEditable.java if you make changes here.
// XXX Negative values are used in Android...
typedef int8_t IMEMessageType;
enum IMEMessage : IMEMessageType
{
// An editable content is getting focus
NOTIFY_IME_OF_FOCUS = 1,
// An editable content is losing focus
NOTIFY_IME_OF_BLUR,
// Selection in the focused editable content is changed
NOTIFY_IME_OF_SELECTION_CHANGE,
// Text in the focused editable content is changed
NOTIFY_IME_OF_TEXT_CHANGE,
// Composition string has been updated
NOTIFY_IME_OF_COMPOSITION_UPDATE,
// Position or size of focused element may be changed.
NOTIFY_IME_OF_POSITION_CHANGE,
// Mouse button event is fired on a character in focused editor
NOTIFY_IME_OF_MOUSE_BUTTON_EVENT,
// Request to commit current composition to IME
// (some platforms may not support)
REQUEST_TO_COMMIT_COMPOSITION,
// Request to cancel current composition to IME
// (some platforms may not support)
REQUEST_TO_CANCEL_COMPOSITION
};
struct IMENotification
{
IMENotification()
: mMessage(static_cast<IMEMessage>(-1))
{}
MOZ_IMPLICIT IMENotification(IMEMessage aMessage)
: mMessage(aMessage)
{
switch (aMessage) {
case NOTIFY_IME_OF_SELECTION_CHANGE:
mSelectionChangeData.mCausedByComposition = false;
break;
case NOTIFY_IME_OF_TEXT_CHANGE:
mTextChangeData.mStartOffset = 0;
mTextChangeData.mOldEndOffset = 0;
mTextChangeData.mNewEndOffset = 0;
mTextChangeData.mCausedByComposition = false;
break;
case NOTIFY_IME_OF_MOUSE_BUTTON_EVENT:
mMouseButtonEventData.mEventMessage = 0;
mMouseButtonEventData.mOffset = UINT32_MAX;
mMouseButtonEventData.mCursorPos.Set(nsIntPoint(0, 0));
mMouseButtonEventData.mCharRect.Set(nsIntRect(0, 0, 0, 0));
mMouseButtonEventData.mButton = -1;
mMouseButtonEventData.mButtons = 0;
mMouseButtonEventData.mModifiers = 0;
default:
break;
}
}
IMEMessage mMessage;
union
{
// NOTIFY_IME_OF_SELECTION_CHANGE specific data
struct
{
bool mCausedByComposition;
} mSelectionChangeData;
// NOTIFY_IME_OF_TEXT_CHANGE specific data
struct
{
uint32_t mStartOffset;
uint32_t mOldEndOffset;
uint32_t mNewEndOffset;
bool mCausedByComposition;
uint32_t OldLength() const { return mOldEndOffset - mStartOffset; }
uint32_t NewLength() const { return mNewEndOffset - mStartOffset; }
int32_t AdditionalLength() const
{
return static_cast<int32_t>(mNewEndOffset - mOldEndOffset);
}
bool IsInInt32Range() const
{
return mStartOffset <= INT32_MAX &&
mOldEndOffset <= INT32_MAX &&
mNewEndOffset <= INT32_MAX;
}
} mTextChangeData;
// NOTIFY_IME_OF_MOUSE_BUTTON_EVENT specific data
struct
{
// The value of WidgetEvent::message
uint32_t mEventMessage;
// Character offset from the start of the focused editor under the cursor
uint32_t mOffset;
// Cursor position in pixels relative to the widget
struct
{
int32_t mX;
int32_t mY;
void Set(const nsIntPoint& aPoint)
{
mX = aPoint.x;
mY = aPoint.y;
}
nsIntPoint AsIntPoint() const
{
return nsIntPoint(mX, mY);
}
} mCursorPos;
// Character rect in pixels under the cursor relative to the widget
struct
{
int32_t mX;
int32_t mY;
int32_t mWidth;
int32_t mHeight;
void Set(const nsIntRect& aRect)
{
mX = aRect.x;
mY = aRect.y;
mWidth = aRect.width;
mHeight = aRect.height;
}
nsIntRect AsIntRect() const
{
return nsIntRect(mX, mY, mWidth, mHeight);
}
} mCharRect;
// The value of WidgetMouseEventBase::button and buttons
int16_t mButton;
int16_t mButtons;
// The value of WidgetInputEvent::modifiers
Modifiers mModifiers;
} mMouseButtonEventData;
};
bool IsCausedByComposition() const
{
switch (mMessage) {
case NOTIFY_IME_OF_SELECTION_CHANGE:
return mSelectionChangeData.mCausedByComposition;
case NOTIFY_IME_OF_TEXT_CHANGE:
return mTextChangeData.mCausedByComposition;
default:
return false;
}
}
};
struct AutoObserverNotifier {
AutoObserverNotifier(nsIObserver* aObserver,
const char* aTopic)
: mObserver(aObserver)
, mTopic(aTopic)
{
}
void SkipNotification()
{
mObserver = nullptr;
}
uint64_t SaveObserver()
{
if (!mObserver) {
return 0;
}
uint64_t observerId = ++sObserverId;
sSavedObservers.Put(observerId, mObserver);
SkipNotification();
return observerId;
}
~AutoObserverNotifier()
{
if (mObserver) {
mObserver->Observe(nullptr, mTopic, nullptr);
}
}
static void NotifySavedObserver(const uint64_t& aObserverId,
const char* aTopic)
{
nsCOMPtr<nsIObserver> observer = sSavedObservers.Get(aObserverId);
if (!observer) {
MOZ_ASSERT(aObserverId == 0, "We should always find a saved observer for nonzero IDs");
return;
}
sSavedObservers.Remove(aObserverId);
observer->Observe(nullptr, aTopic, nullptr);
}
private:
nsCOMPtr<nsIObserver> mObserver;
const char* mTopic;
private:
static uint64_t sObserverId;
static nsDataHashtable<nsUint64HashKey, nsCOMPtr<nsIObserver>> sSavedObservers;
};
} // namespace widget
} // namespace mozilla
/**
* The base class for all the widgets. It provides the interface for
* all basic and necessary functionality.
*/
class nsIWidget : public nsISupports {
protected:
typedef mozilla::dom::TabChild TabChild;
public:
typedef mozilla::layers::Composer2D Composer2D;
typedef mozilla::layers::CompositorChild CompositorChild;
typedef mozilla::layers::LayerManager LayerManager;
typedef mozilla::layers::LayerManagerComposite LayerManagerComposite;
typedef mozilla::layers::LayersBackend LayersBackend;
typedef mozilla::layers::PLayerTransactionChild PLayerTransactionChild;
typedef mozilla::widget::IMEMessage IMEMessage;
typedef mozilla::widget::IMENotification IMENotification;
typedef mozilla::widget::IMEState IMEState;
typedef mozilla::widget::InputContext InputContext;
typedef mozilla::widget::InputContextAction InputContextAction;
typedef mozilla::widget::SizeConstraints SizeConstraints;
typedef mozilla::widget::TextEventDispatcher TextEventDispatcher;
typedef mozilla::CompositorVsyncDispatcher CompositorVsyncDispatcher;
// Used in UpdateThemeGeometries.
struct ThemeGeometry {
// The ThemeGeometryType value for the themed widget, see
// nsITheme::ThemeGeometryTypeForWidget.
nsITheme::ThemeGeometryType mType;
// The device-pixel rect within the window for the themed widget
nsIntRect mRect;
ThemeGeometry(nsITheme::ThemeGeometryType aType, const nsIntRect& aRect)
: mType(aType)
, mRect(aRect)
{ }
};
NS_DECLARE_STATIC_IID_ACCESSOR(NS_IWIDGET_IID)
nsIWidget()
: mLastChild(nullptr)
, mPrevSibling(nullptr)
, mOnDestroyCalled(false)
, mWindowType(eWindowType_child)
, mZIndex(0)
{
ClearNativeTouchSequence(nullptr);
}
/**
* Create and initialize a widget.
*
* All the arguments can be null in which case a top level window
* with size 0 is created. The event callback function has to be
* provided only if the caller wants to deal with the events this
* widget receives. The event callback is basically a preprocess
* hook called synchronously. The return value determines whether
* the event goes to the default window procedure or it is hidden
* to the os. The assumption is that if the event handler returns
* false the widget does not see the event. The widget should not
* automatically clear the window to the background color. The
* calling code must handle paint messages and clear the background
* itself.
*
* In practice at least one of aParent and aNativeParent will be null. If
* both are null the widget isn't parented (e.g. context menus or
* independent top level windows).
*
* The dimensions given in aRect are specified in the parent's
* coordinate system, or for parentless widgets such as top-level
* windows, in global CSS pixels.
*
* @param aParent parent nsIWidget
* @param aNativeParent native parent widget
* @param aRect the widget dimension
* @param aInitData data that is used for widget initialization
*
*/
NS_IMETHOD Create(nsIWidget *aParent,
nsNativeWidget aNativeParent,
const nsIntRect &aRect,
nsWidgetInitData *aInitData = nullptr) = 0;
/**
* Allocate, initialize, and return a widget that is a child of
* |this|. The returned widget (if nonnull) has gone through the
* equivalent of CreateInstance(widgetCID) + Create(...).
*
* |CreateChild()| lets widget backends decide whether to parent
* the new child widget to this, nonnatively parent it, or both.
* This interface exists to support the PuppetWidget backend,
* which is entirely non-native. All other params are the same as
* for |Create()|.
*
* |aForceUseIWidgetParent| forces |CreateChild()| to only use the
* |nsIWidget*| this, not its native widget (if it exists), when
* calling |Create()|. This is a timid hack around poorly
* understood code, and shouldn't be used in new code.
*/
virtual already_AddRefed<nsIWidget>
CreateChild(const nsIntRect &aRect,
nsWidgetInitData *aInitData = nullptr,
bool aForceUseIWidgetParent = false) = 0;
/**
* Attach to a top level widget.
*
* In cases where a top level chrome widget is being used as a content
* container, attach a secondary listener and update the device
* context. The primary widget listener will continue to be called for
* notifications relating to the top-level window, whereas other
* notifications such as painting and events will instead be called via
* the attached listener. SetAttachedWidgetListener should be used to
* assign the attached listener.
*
* aUseAttachedEvents if true, events are sent to the attached listener
* instead of the normal listener.
*/
NS_IMETHOD AttachViewToTopLevel(bool aUseAttachedEvents) = 0;
/**
* Accessor functions to get and set the attached listener. Used by
* nsView in connection with AttachViewToTopLevel above.
*/
virtual void SetAttachedWidgetListener(nsIWidgetListener* aListener) = 0;
virtual nsIWidgetListener* GetAttachedWidgetListener() = 0;
/**
* Accessor functions to get and set the listener which handles various
* actions for the widget.
*/
//@{
virtual nsIWidgetListener* GetWidgetListener() = 0;
virtual void SetWidgetListener(nsIWidgetListener* alistener) = 0;
//@}
/**
* Close and destroy the internal native window.
* This method does not delete the widget.
*/
NS_IMETHOD Destroy(void) = 0;
/**
* Destroyed() returns true if Destroy() has been called already.
* Otherwise, false.
*/
bool Destroyed() const { return mOnDestroyCalled; }
/**
* Reparent a widget
*
* Change the widget's parent. Null parents are allowed.
*
* @param aNewParent new parent
*/
NS_IMETHOD SetParent(nsIWidget* aNewParent) = 0;
/**
* Return the parent Widget of this Widget or nullptr if this is a
* top level window
*
* @return the parent widget or nullptr if it does not have a parent
*
*/
virtual nsIWidget* GetParent(void) = 0;
/**
* Return the top level Widget of this Widget
*
* @return the top level widget
*/
virtual nsIWidget* GetTopLevelWidget() = 0;
/**
* Return the top (non-sheet) parent of this Widget if it's a sheet,
* or nullptr if this isn't a sheet (or some other error occurred).
* Sheets are only supported on some platforms (currently only OS X).
*
* @return the top (non-sheet) parent widget or nullptr
*
*/
virtual nsIWidget* GetSheetWindowParent(void) = 0;
/**
* Return the physical DPI of the screen containing the window ...
* the number of device pixels per inch.
*/
virtual float GetDPI() = 0;
/**
* Returns the CompositorVsyncDispatcher associated with this widget
*/
virtual CompositorVsyncDispatcher* GetCompositorVsyncDispatcher() = 0;
/**
* Return the default scale factor for the window. This is the
* default number of device pixels per CSS pixel to use. This should
* depend on OS/platform settings such as the Mac's "UI scale factor"
* or Windows' "font DPI". This will take into account Gecko preferences
* overriding the system setting.
*/
mozilla::CSSToLayoutDeviceScale GetDefaultScale();
/**
* Return the Gecko override of the system default scale, if any;
* returns <= 0.0 if the system scale should be used as-is.
* nsIWidget::GetDefaultScale() [above] takes this into account.
* It is exposed here so that code that wants to check for a
* default-scale override without having a widget on hand can
* easily access the same value.
* Note that any scale override is a browser-wide value, whereas
* the default GetDefaultScale value (when no override is present)
* may vary between widgets (or screens).
*/
static double DefaultScaleOverride();
/**
* Return the first child of this widget. Will return null if
* there are no children.
*/
nsIWidget* GetFirstChild() const {
return mFirstChild;
}
/**
* Return the last child of this widget. Will return null if
* there are no children.
*/
nsIWidget* GetLastChild() const {
return mLastChild;
}
/**
* Return the next sibling of this widget
*/
nsIWidget* GetNextSibling() const {
return mNextSibling;
}
/**
* Set the next sibling of this widget
*/
void SetNextSibling(nsIWidget* aSibling) {
mNextSibling = aSibling;
}
/**
* Return the previous sibling of this widget
*/
nsIWidget* GetPrevSibling() const {
return mPrevSibling;
}
/**
* Set the previous sibling of this widget
*/
void SetPrevSibling(nsIWidget* aSibling) {
mPrevSibling = aSibling;
}
/**
* Show or hide this widget
*
* @param aState true to show the Widget, false to hide it
*
*/
NS_IMETHOD Show(bool aState) = 0;
/**
* Make the window modal
*
*/
NS_IMETHOD SetModal(bool aModal) = 0;
/**
* The maximum number of simultaneous touch contacts supported by the device.
* In the case of devices with multiple digitizers (e.g. multiple touch screens),
* the value will be the maximum of the set of maximum supported contacts by
* each individual digitizer.
*/
virtual uint32_t GetMaxTouchPoints() const = 0;
/**
* Returns whether the window is visible
*
*/
virtual bool IsVisible() const = 0;
/**
* Perform platform-dependent sanity check on a potential window position.
* This is guaranteed to work only for top-level windows.
*
* @param aAllowSlop: if true, allow the window to slop offscreen;
* the window should be partially visible. if false,
* force the entire window onscreen (or at least
* the upper-left corner, if it's too large).
* @param aX in: an x position expressed in screen coordinates.
* out: the x position constrained to fit on the screen(s).
* @param aY in: an y position expressed in screen coordinates.
* out: the y position constrained to fit on the screen(s).
* @return vapid success indication. but see also the parameters.
*
**/
NS_IMETHOD ConstrainPosition(bool aAllowSlop,
int32_t *aX,
int32_t *aY) = 0;
/**
* NOTE:
*
* For a top-level window widget, the "parent's coordinate system" is the
* "global" display pixel coordinate space, *not* device pixels (which
* may be inconsistent between multiple screens, at least in the Mac OS
* case with mixed hi-dpi and lo-dpi displays). This applies to all the
* following Move and Resize widget APIs.
*
* The display-/device-pixel distinction becomes important for (at least)
* Mac OS X with Hi-DPI (retina) displays, and Windows when the UI scale
* factor is set to other than 100%.
*
* The Move and Resize methods take floating-point parameters, rather than
* integer ones. This is important when manipulating top-level widgets,
* where the coordinate system may not be an integral multiple of the
* device-pixel space.
**/
/**
* Move this widget.
*
* Coordinates refer to the top-left of the widget. For toplevel windows
* with decorations, this is the top-left of the titlebar and frame .
*
* @param aX the new x position expressed in the parent's coordinate system
* @param aY the new y position expressed in the parent's coordinate system
*
**/
NS_IMETHOD Move(double aX, double aY) = 0;
/**
* Reposition this widget so that the client area has the given offset.
*
* @param aX the new x offset of the client area expressed as an
* offset from the origin of the client area of the parent
* widget (for root widgets and popup widgets it is in
* screen coordinates)
* @param aY the new y offset of the client area expressed as an
* offset from the origin of the client area of the parent
* widget (for root widgets and popup widgets it is in
* screen coordinates)
*
**/
NS_IMETHOD MoveClient(double aX, double aY) = 0;
/**
* Resize this widget. Any size constraints set for the window by a
* previous call to SetSizeConstraints will be applied.
*
* @param aWidth the new width expressed in the parent's coordinate system
* @param aHeight the new height expressed in the parent's coordinate system
* @param aRepaint whether the widget should be repainted
*
*/
NS_IMETHOD Resize(double aWidth,
double aHeight,
bool aRepaint) = 0;
/**
* Move or resize this widget. Any size constraints set for the window by
* a previous call to SetSizeConstraints will be applied.
*
* @param aX the new x position expressed in the parent's coordinate system
* @param aY the new y position expressed in the parent's coordinate system
* @param aWidth the new width expressed in the parent's coordinate system
* @param aHeight the new height expressed in the parent's coordinate system
* @param aRepaint whether the widget should be repainted if the size changes
*
*/
NS_IMETHOD Resize(double aX,
double aY,
double aWidth,
double aHeight,
bool aRepaint) = 0;
/**
* Resize the widget so that the inner client area has the given size.
*
* @param aWidth the new width of the client area.
* @param aHeight the new height of the client area.
* @param aRepaint whether the widget should be repainted
*
*/
NS_IMETHOD ResizeClient(double aWidth,
double aHeight,
bool aRepaint) = 0;
/**
* Resize and reposition the widget so tht inner client area has the given
* offset and size.
*
* @param aX the new x offset of the client area expressed as an
* offset from the origin of the client area of the parent
* widget (for root widgets and popup widgets it is in
* screen coordinates)
* @param aY the new y offset of the client area expressed as an
* offset from the origin of the client area of the parent
* widget (for root widgets and popup widgets it is in
* screen coordinates)
* @param aWidth the new width of the client area.
* @param aHeight the new height of the client area.
* @param aRepaint whether the widget should be repainted
*
*/
NS_IMETHOD ResizeClient(double aX,
double aY,
double aWidth,
double aHeight,
bool aRepaint) = 0;
/**
* Sets the widget's z-index.
*/
virtual void SetZIndex(int32_t aZIndex) = 0;
/**
* Gets the widget's z-index.
*/
int32_t GetZIndex()
{
return mZIndex;
}
/**
* Position this widget just behind the given widget. (Used to
* control z-order for top-level widgets. Get/SetZIndex by contrast
* control z-order for child widgets of other widgets.)
* @param aPlacement top, bottom, or below a widget
* (if top or bottom, param aWidget is ignored)
* @param aWidget widget to place this widget behind
* (only if aPlacement is eZPlacementBelow).
* null is equivalent to aPlacement of eZPlacementTop
* @param aActivate true to activate the widget after placing it
*/
NS_IMETHOD PlaceBehind(nsTopLevelWidgetZPlacement aPlacement,
nsIWidget *aWidget, bool aActivate) = 0;
/**
* Minimize, maximize or normalize the window size.
* Takes a value from nsSizeMode (see nsIWidgetListener.h)
*/
NS_IMETHOD SetSizeMode(int32_t aMode) = 0;
/**
* Return size mode (minimized, maximized, normalized).
* Returns a value from nsSizeMode (see nsIWidgetListener.h)
*/
virtual int32_t SizeMode() = 0;
/**
* Enable or disable this Widget
*
* @param aState true to enable the Widget, false to disable it.
*
*/
NS_IMETHOD Enable(bool aState) = 0;
/**
* Ask whether the widget is enabled
*/
virtual bool IsEnabled() const = 0;
/**
* Request activation of this window or give focus to this widget.
*
* @param aRaise If true, this function requests activation of this
* widget's toplevel window.
* If false, the appropriate toplevel window (which in
* the case of popups may not be this widget's toplevel
* window) is already active.
*/
NS_IMETHOD SetFocus(bool aRaise = false) = 0;
/**
* Get this widget's outside dimensions relative to its parent widget. For
* popup widgets the returned rect is in screen coordinates and not
* relative to its parent widget.
*
* @param aRect On return it holds the x, y, width and height of
* this widget.
*/
NS_IMETHOD GetBounds(nsIntRect &aRect) = 0;
/**
* Get this widget's outside dimensions in global coordinates. This
* includes any title bar on the window.
*
* @param aRect On return it holds the x, y, width and height of
* this widget.
*/
NS_IMETHOD GetScreenBounds(nsIntRect &aRect) = 0;
/**
* Similar to GetScreenBounds except that this function will always
* get the size when the widget is in the nsSizeMode_Normal size mode
* even if the current size mode is not nsSizeMode_Normal.
* This method will fail if the size mode is not nsSizeMode_Normal and
* the platform doesn't have the ability.
* This method will always succeed if the current size mode is
* nsSizeMode_Normal.
*
* @param aRect On return it holds the x, y, width and height of
* this widget.
*/
NS_IMETHOD GetRestoredBounds(nsIntRect &aRect) = 0;
/**
* Get this widget's client area bounds, if the window has a 3D border
* appearance this returns the area inside the border. The position is the
* position of the client area relative to the client area of the parent
* widget (for root widgets and popup widgets it is in screen coordinates).
*
* @param aRect On return it holds the x. y, width and height of
* the client area of this widget.
*/
NS_IMETHOD GetClientBounds(nsIntRect &aRect) = 0;
/**
* Get the non-client area dimensions of the window.
*
*/
NS_IMETHOD GetNonClientMargins(nsIntMargin &margins) = 0;
/**
* Sets the non-client area dimensions of the window. Pass -1 to restore
* the system default frame size for that border. Pass zero to remove
* a border, or pass a specific value adjust a border. Units are in
* pixels. (DPI dependent)
*
* Platform notes:
* Windows: shrinking top non-client height will remove application
* icon and window title text. Glass desktops will refuse to set
* dimensions between zero and size < system default.
*
*/
NS_IMETHOD SetNonClientMargins(nsIntMargin &margins) = 0;
/**
* Get the client offset from the window origin.
*
* @return the x and y of the offset.
*
*/
virtual nsIntPoint GetClientOffset() = 0;
/**
* Equivalent to GetClientBounds but only returns the size.
*/
virtual mozilla::gfx::IntSize GetClientSize() {
// Dependeing on the backend, overloading this method may be useful if
// if requesting the client offset is expensive.
nsIntRect rect;
GetClientBounds(rect);
return mozilla::gfx::IntSize(rect.width, rect.height);
}
/**
* Set the background color for this widget
*
* @param aColor the new background color
*
*/
virtual void SetBackgroundColor(const nscolor &aColor) { }
/**
* Get the cursor for this widget.
*
* @return this widget's cursor.
*/
virtual nsCursor GetCursor(void) = 0;
/**
* Set the cursor for this widget
*
* @param aCursor the new cursor for this widget
*/
NS_IMETHOD SetCursor(nsCursor aCursor) = 0;
/**
* If a cursor type is currently cached locally for this widget, clear the
* cached cursor to force an update on the next SetCursor call.
*/
virtual void ClearCachedCursor() = 0;
/**
* Sets an image as the cursor for this widget.
*
* @param aCursor the cursor to set
* @param aX the X coordinate of the hotspot (from left).
* @param aY the Y coordinate of the hotspot (from top).
* @retval NS_ERROR_NOT_IMPLEMENTED if setting images as cursors is not
* supported
*/
NS_IMETHOD SetCursor(imgIContainer* aCursor,
uint32_t aHotspotX, uint32_t aHotspotY) = 0;
/**
* Get the window type of this widget.
*/
nsWindowType WindowType() { return mWindowType; }
/**
* Determines if this widget is one of the three types of plugin widgets.
*/
bool IsPlugin() {
return mWindowType == eWindowType_plugin ||
mWindowType == eWindowType_plugin_ipc_chrome ||
mWindowType == eWindowType_plugin_ipc_content;
}
/**
* Set the transparency mode of the top-level window containing this widget.
* So, e.g., if you call this on the widget for an IFRAME, the top level
* browser window containing the IFRAME actually gets set. Be careful.
*
* This can fail if the platform doesn't support
* transparency/glass. By default widgets are not
* transparent. This will also fail if the toplevel window is not
* a Mozilla window, e.g., if the widget is in an embedded
* context.
*
* After transparency/glass has been enabled, the initial alpha channel
* value for all pixels is 1, i.e., opaque.
* If the window is resized then the alpha channel values for
* all pixels are reset to 1.
* Pixel RGB color values are already premultiplied with alpha channel values.
*/
virtual void SetTransparencyMode(nsTransparencyMode aMode) = 0;
/**
* Get the transparency mode of the top-level window that contains this
* widget.
*/
virtual nsTransparencyMode GetTransparencyMode() = 0;
/**
* This represents a command to set the bounds and clip region of
* a child widget.
*/
struct Configuration {
nsIWidget* mChild;
uintptr_t mWindowID; // e10s specific, the unique plugin port id
bool mVisible; // e10s specific, widget visibility
nsIntRect mBounds;
nsTArray<nsIntRect> mClipRegion;
};
/**
* Sets the clip region of each mChild (which must actually be a child
* of this widget) to the union of the pixel rects given in
* mClipRegion, all relative to the top-left of the child
* widget. Clip regions are not implemented on all platforms and only
* need to actually work for children that are plugins.
*
* Also sets the bounds of each child to mBounds.
*
* This will invalidate areas of the children that have changed, but
* does not need to invalidate any part of this widget.
*
* Children should be moved in the order given; the array is
* sorted so to minimize unnecessary invalidation if children are
* moved in that order.
*/
virtual nsresult ConfigureChildren(const nsTArray<Configuration>& aConfigurations) = 0;
virtual nsresult SetWindowClipRegion(const nsTArray<nsIntRect>& aRects,
bool aIntersectWithExisting) = 0;
/**
* Appends to aRects the rectangles constituting this widget's clip
* region. If this widget is not clipped, appends a single rectangle
* (0, 0, bounds.width, bounds.height).
*/
virtual void GetWindowClipRegion(nsTArray<nsIntRect>* aRects) = 0;
/**
* Register or unregister native plugin widgets which receive Configuration
* data from the content process via the compositor.
*
* Lookups are used by the main thread via the compositor to lookup widgets
* based on a unique window id. On Windows and Linux this is the
* NS_NATIVE_PLUGIN_PORT (hwnd/XID). This tracking maintains a reference to
* widgets held. Consumers are responsible for removing widgets from this
* list.
*/
virtual void RegisterPluginWindowForRemoteUpdates() = 0;
virtual void UnregisterPluginWindowForRemoteUpdates() = 0;
static nsIWidget* LookupRegisteredPluginWindow(uintptr_t aWindowID);
/**
* Iterates across the list of registered plugin widgets and updates thier
* visibility based on which plugins are included in the 'visible' list.
*
* The compositor knows little about tabs, but it does know which plugin
* widgets are currently included in the visible layer tree. It calls this
* helper to hide widgets it knows nothing about.
*/
static void UpdateRegisteredPluginWindowVisibility(nsTArray<uintptr_t>& aVisibleList);
/**
* Set the shadow style of the window.
*
* Ignored on child widgets and on non-Mac platforms.
*/
NS_IMETHOD SetWindowShadowStyle(int32_t aStyle) = 0;
/*
* On Mac OS X, this method shows or hides the pill button in the titlebar
* that's used to collapse the toolbar.
*
* Ignored on child widgets and on non-Mac platforms.
*/
virtual void SetShowsToolbarButton(bool aShow) = 0;
/*
* On Mac OS X Lion, this method shows or hides the full screen button in
* the titlebar that handles native full screen mode.
*
* Ignored on child widgets, non-Mac platforms, & pre-Lion Mac.
*/
virtual void SetShowsFullScreenButton(bool aShow) = 0;
enum WindowAnimationType {
eGenericWindowAnimation,
eDocumentWindowAnimation
};
/**
* Sets the kind of top-level window animation this widget should have. On
* Mac OS X, this causes a particular kind of animation to be shown when the
* window is first made visible.
*
* Ignored on child widgets and on non-Mac platforms.
*/
virtual void SetWindowAnimationType(WindowAnimationType aType) = 0;
/**
* Specifies whether the window title should be drawn even if the window
* contents extend into the titlebar. Ignored on windows that don't draw
* in the titlebar. Only implemented on OS X.
*/
virtual void SetDrawsTitle(bool aDrawTitle) {}
/**
* Indicates whether the widget should attempt to make titlebar controls
* easier to see on dark titlebar backgrounds.
*/
virtual void SetUseBrightTitlebarForeground(bool aBrightForeground) {}
/**
* Hide window chrome (borders, buttons) for this widget.
*
*/
NS_IMETHOD HideWindowChrome(bool aShouldHide) = 0;
/**
* Put the toplevel window into or out of fullscreen mode.
* If aTargetScreen is given, attempt to go fullscreen on that screen,
* if possible. (If not, it behaves as if aTargetScreen is null.)
* If !aFullScreen, aTargetScreen is ignored.
* aTargetScreen support is currently only implemented on Windows.
*/
NS_IMETHOD MakeFullScreen(bool aFullScreen, nsIScreen* aTargetScreen = nullptr) = 0;
/**
* Invalidate a specified rect for a widget so that it will be repainted
* later.
*/
NS_IMETHOD Invalidate(const nsIntRect & aRect) = 0;
enum LayerManagerPersistence
{
LAYER_MANAGER_CURRENT = 0,
LAYER_MANAGER_PERSISTENT
};
/**
* Return the widget's LayerManager. The layer tree for that
* LayerManager is what gets rendered to the widget.
*
* @param aAllowRetaining an outparam that states whether the returned
* layer manager should be used for retained layers
*/
inline LayerManager* GetLayerManager(bool* aAllowRetaining = nullptr)
{
return GetLayerManager(nullptr, mozilla::layers::LayersBackend::LAYERS_NONE,
LAYER_MANAGER_CURRENT, aAllowRetaining);
}
inline LayerManager* GetLayerManager(LayerManagerPersistence aPersistence,
bool* aAllowRetaining = nullptr)
{
return GetLayerManager(nullptr, mozilla::layers::LayersBackend::LAYERS_NONE,
aPersistence, aAllowRetaining);
}
/**
* Like GetLayerManager(), but prefers creating a layer manager of
* type |aBackendHint| instead of what would normally be created.
* LayersBackend::LAYERS_NONE means "no hint".
*/
virtual LayerManager* GetLayerManager(PLayerTransactionChild* aShadowManager,
LayersBackend aBackendHint,
LayerManagerPersistence aPersistence = LAYER_MANAGER_CURRENT,
bool* aAllowRetaining = nullptr) = 0;
/**
* Called before each layer manager transaction to allow any preparation
* for DrawWindowUnderlay/Overlay that needs to be on the main thread.
*
* Always called on the main thread.
*/
virtual void PrepareWindowEffects() = 0;
/**
* Called when shutting down the LayerManager to clean-up any cached resources.
*
* Always called from the compositing thread, which may be the main-thread if
* OMTC is not enabled.
*/
virtual void CleanupWindowEffects() = 0;
/**
* Called before rendering using OMTC. Returns false when the widget is
* not ready to be rendered (for example while the window is closed).
*
* Always called from the compositing thread, which may be the main-thread if
* OMTC is not enabled.
*/
virtual bool PreRender(LayerManagerComposite* aManager) = 0;
/**
* Called after rendering using OMTC. Not called when rendering was
* cancelled by a negative return value from PreRender.
*
* Always called from the compositing thread, which may be the main-thread if
* OMTC is not enabled.
*/
virtual void PostRender(LayerManagerComposite* aManager) = 0;
/**
* Called before the LayerManager draws the layer tree.
*
* Always called from the compositing thread.
*/
virtual void DrawWindowUnderlay(LayerManagerComposite* aManager, nsIntRect aRect) = 0;
/**
* Called after the LayerManager draws the layer tree
*
* Always called from the compositing thread.
*/
virtual void DrawWindowOverlay(LayerManagerComposite* aManager, nsIntRect aRect) = 0;
/**
* Return a DrawTarget for the window which can be composited into.
*
* Called by BasicCompositor on the compositor thread for OMTC drawing
* before each composition.
*/
virtual mozilla::TemporaryRef<mozilla::gfx::DrawTarget> StartRemoteDrawing() = 0;
/**
* Ensure that what was painted into the DrawTarget returned from
* StartRemoteDrawing reaches the screen.
*
* Called by BasicCompositor on the compositor thread for OMTC drawing
* after each composition.
*/
virtual void EndRemoteDrawing() = 0;
/**
* Clean up any resources used by Start/EndRemoteDrawing.
*
* Called by BasicCompositor on the compositor thread for OMTC drawing
* when the compositor is destroyed.
*/
virtual void CleanupRemoteDrawing() = 0;
/**
* Called when Gecko knows which themed widgets exist in this window.
* The passed array contains an entry for every themed widget of the right
* type (currently only NS_THEME_MOZ_MAC_UNIFIED_TOOLBAR and
* NS_THEME_TOOLBAR) within the window, except for themed widgets which are
* transformed or have effects applied to them (e.g. CSS opacity or
* filters).
* This could sometimes be called during display list construction
* outside of painting.
* If called during painting, it will be called before we actually
* paint anything.
*/
virtual void UpdateThemeGeometries(const nsTArray<ThemeGeometry>& aThemeGeometries) = 0;
/**
* Informs the widget about the region of the window that is opaque.
*
* @param aOpaqueRegion the region of the window that is opaque.
*/
virtual void UpdateOpaqueRegion(const nsIntRegion &aOpaqueRegion) {}
/**
* Informs the widget about the region of the window that is draggable.
*/
virtual void UpdateWindowDraggingRegion(const nsIntRegion& aRegion) {}
/**
* Internal methods
*/
//@{
virtual void AddChild(nsIWidget* aChild) = 0;
virtual void RemoveChild(nsIWidget* aChild) = 0;
virtual void* GetNativeData(uint32_t aDataType) = 0;
virtual void SetNativeData(uint32_t aDataType, uintptr_t aVal) = 0;
virtual void FreeNativeData(void * data, uint32_t aDataType) = 0;//~~~
//@}
/**
* Set the widget's title.
* Must be called after Create.
*
* @param aTitle string displayed as the title of the widget
*/
NS_IMETHOD SetTitle(const nsAString& aTitle) = 0;
/**
* Set the widget's icon.
* Must be called after Create.
*
* @param anIconSpec string specifying the icon to use; convention is to pass
* a resource: URL from which a platform-dependent resource
* file name will be constructed
*/
NS_IMETHOD SetIcon(const nsAString& anIconSpec) = 0;
/**
* Return this widget's origin in screen coordinates. The untyped version
* exists temporarily to ease conversion to typed coordinates.
*
* @return screen coordinates stored in the x,y members
*/
virtual mozilla::LayoutDeviceIntPoint WidgetToScreenOffset() = 0;
virtual nsIntPoint WidgetToScreenOffsetUntyped() {
return mozilla::LayoutDeviceIntPoint::ToUntyped(WidgetToScreenOffset());
}
/**
* Given the specified client size, return the corresponding window size,
* which includes the area for the borders and titlebar. This method
* should work even when the window is not yet visible.
*/
virtual mozilla::LayoutDeviceIntSize ClientToWindowSize(
const mozilla::LayoutDeviceIntSize& aClientSize) = 0;
/**
* Dispatches an event to the widget
*
*/
NS_IMETHOD DispatchEvent(mozilla::WidgetGUIEvent* event,
nsEventStatus & aStatus) = 0;
/**
* Dispatches an event that must be handled by APZ first, when APZ is
* enabled. If invoked in the child process, it is forwarded to the
* parent process synchronously.
*/
virtual nsEventStatus DispatchAPZAwareEvent(mozilla::WidgetInputEvent* aEvent) = 0;
/**
* Dispatches an event that must be transformed by APZ first, but is not
* actually handled by APZ. If invoked in the child process, it is
* forwarded to the parent process synchronously.
*/
virtual nsEventStatus DispatchInputEvent(mozilla::WidgetInputEvent* aEvent) = 0;
/**
* Confirm an APZ-aware event target. This should be used when APZ will
* not need a layers update to process the event.
*/
virtual void SetConfirmedTargetAPZC(uint64_t aInputBlockId,
const nsTArray<mozilla::layers::ScrollableLayerGuid>& aTargets) const = 0;
/**
* Enables the dropping of files to a widget (XXX this is temporary)
*
*/
NS_IMETHOD EnableDragDrop(bool aEnable) = 0;
/**
* Enables/Disables system mouse capture.
* @param aCapture true enables mouse capture, false disables mouse capture
*
*/
NS_IMETHOD CaptureMouse(bool aCapture) = 0;
/**
* Classify the window for the window manager. Mostly for X11.
*/
NS_IMETHOD SetWindowClass(const nsAString& xulWinType) = 0;
/**
* Enables/Disables system capture of any and all events that would cause a
* popup to be rolled up. aListener should be set to a non-null value for
* any popups that are not managed by the popup manager.
* @param aDoCapture true enables capture, false disables capture
*
*/
NS_IMETHOD CaptureRollupEvents(nsIRollupListener* aListener, bool aDoCapture) = 0;
/**
* Bring this window to the user's attention. This is intended to be a more
* gentle notification than popping the window to the top or putting up an
* alert. See, for example, Win32 FlashWindow or the NotificationManager on
* the Mac. The notification should be suppressed if the window is already
* in the foreground and should be dismissed when the user brings this window
* to the foreground.
* @param aCycleCount Maximum number of times to animate the window per system
* conventions. If set to -1, cycles indefinitely until
* window is brought into the foreground.
*/
NS_IMETHOD GetAttention(int32_t aCycleCount) = 0;
/**
* Ask whether there user input events pending. All input events are
* included, including those not targeted at this nsIwidget instance.
*/
virtual bool HasPendingInputEvent() = 0;
/**
* Set the background color of the window titlebar for this widget. On Mac,
* for example, this will remove the grey gradient and bottom border and
* instead show a single, solid color.
*
* Ignored on any platform that does not support it. Ignored by widgets that
* do not represent windows.
*
* @param aColor The color to set the title bar background to. Alpha values
* other than fully transparent (0) are respected if possible
* on the platform. An alpha of 0 will cause the window to
* draw with the default style for the platform.
*
* @param aActive Whether the color should be applied to active or inactive
* windows.
*/
NS_IMETHOD SetWindowTitlebarColor(nscolor aColor, bool aActive) = 0;
/**
* If set to true, the window will draw its contents into the titlebar
* instead of below it.
*
* Ignored on any platform that does not support it. Ignored by widgets that
* do not represent windows.
* May result in a resize event, so should only be called from places where
* reflow and painting is allowed.
*
* @param aState Whether drawing into the titlebar should be activated.
*/
virtual void SetDrawsInTitlebar(bool aState) = 0;
/*
* Determine whether the widget shows a resize widget. If it does,
* aResizerRect returns the resizer's rect.
*
* Returns false on any platform that does not support it.
*
* @param aResizerRect The resizer's rect in device pixels.
* @return Whether a resize widget is shown.
*/
virtual bool ShowsResizeIndicator(nsIntRect* aResizerRect) = 0;
/**
* Return the popup that was last rolled up, or null if there isn't one.
*/
virtual nsIContent* GetLastRollup() = 0;
/**
* Begin a window resizing drag, based on the event passed in.
*/
NS_IMETHOD BeginResizeDrag(mozilla::WidgetGUIEvent* aEvent,
int32_t aHorizontal,
int32_t aVertical) = 0;
/**
* Begin a window moving drag, based on the event passed in.
*/
NS_IMETHOD BeginMoveDrag(mozilla::WidgetMouseEvent* aEvent) = 0;
enum Modifiers {
CAPS_LOCK = 0x01, // when CapsLock is active
NUM_LOCK = 0x02, // when NumLock is active
SHIFT_L = 0x0100,
SHIFT_R = 0x0200,
CTRL_L = 0x0400,
CTRL_R = 0x0800,
ALT_L = 0x1000, // includes Option
ALT_R = 0x2000,
COMMAND_L = 0x4000,
COMMAND_R = 0x8000,
HELP = 0x10000,
FUNCTION = 0x100000,
NUMERIC_KEY_PAD = 0x01000000 // when the key is coming from the keypad
};
/**
* Utility method intended for testing. Dispatches native key events
* to this widget to simulate the press and release of a key.
* @param aNativeKeyboardLayout a *platform-specific* constant.
* On Mac, this is the resource ID for a 'uchr' or 'kchr' resource.
* On Windows, it is converted to a hex string and passed to
* LoadKeyboardLayout, see
* http://msdn.microsoft.com/en-us/library/ms646305(VS.85).aspx
* @param aNativeKeyCode a *platform-specific* keycode.
* On Windows, this is the virtual key code.
* @param aModifiers some combination of the above 'Modifiers' flags;
* not all flags will apply to all platforms. Mac ignores the _R
* modifiers. Windows ignores COMMAND, NUMERIC_KEY_PAD, HELP and
* FUNCTION.
* @param aCharacters characters that the OS would decide to generate
* from the event. On Windows, this is the charCode passed by
* WM_CHAR.
* @param aUnmodifiedCharacters characters that the OS would decide
* to generate from the event if modifier keys (other than shift)
* were assumed inactive. Needed on Mac, ignored on Windows.
* @param aObserver the observer that will get notified once the events
* have been dispatched.
* @return NS_ERROR_NOT_AVAILABLE to indicate that the keyboard
* layout is not supported and the event was not fired
*/
virtual nsresult SynthesizeNativeKeyEvent(int32_t aNativeKeyboardLayout,
int32_t aNativeKeyCode,
uint32_t aModifierFlags,
const nsAString& aCharacters,
const nsAString& aUnmodifiedCharacters,
nsIObserver* aObserver) = 0;
/**
* Utility method intended for testing. Dispatches native mouse events
* may even move the mouse cursor. On Mac the events are guaranteed to
* be sent to the window containing this widget, but on Windows they'll go
* to whatever's topmost on the screen at that position, so for
* cross-platform testing ensure that your window is at the top of the
* z-order.
* @param aPoint screen location of the mouse, in device
* pixels, with origin at the top left
* @param aNativeMessage *platform-specific* event type (e.g. on Mac,
* NSMouseMoved; on Windows, MOUSEEVENTF_MOVE, MOUSEEVENTF_LEFTDOWN etc)
* @param aModifierFlags *platform-specific* modifier flags (ignored
* on Windows)
* @param aObserver the observer that will get notified once the events
* have been dispatched.
*/
virtual nsresult SynthesizeNativeMouseEvent(mozilla::LayoutDeviceIntPoint aPoint,
uint32_t aNativeMessage,
uint32_t aModifierFlags,
nsIObserver* aObserver) = 0;
/**
* A shortcut to SynthesizeNativeMouseEvent, abstracting away the native message.
* aPoint is location in device pixels to which the mouse pointer moves to.
* @param aObserver the observer that will get notified once the events
* have been dispatched.
*/
virtual nsresult SynthesizeNativeMouseMove(mozilla::LayoutDeviceIntPoint aPoint,
nsIObserver* aObserver) = 0;
/**
* Utility method intended for testing. Dispatching native mouse scroll
* events may move the mouse cursor.
*
* @param aPoint Mouse cursor position in screen coordinates.
* In device pixels, the origin at the top left of
* the primary display.
* @param aNativeMessage Platform native message.
* @param aDeltaX The delta value for X direction. If the native
* message doesn't indicate X direction scrolling,
* this may be ignored.
* @param aDeltaY The delta value for Y direction. If the native
* message doesn't indicate Y direction scrolling,
* this may be ignored.
* @param aDeltaZ The delta value for Z direction. If the native
* message doesn't indicate Z direction scrolling,
* this may be ignored.
* @param aModifierFlags Must be values of Modifiers, or zero.
* @param aAdditionalFlags See nsIDOMWidnowUtils' consts and their
* document.
* @param aObserver The observer that will get notified once the
* events have been dispatched.
*/
virtual nsresult SynthesizeNativeMouseScrollEvent(mozilla::LayoutDeviceIntPoint aPoint,
uint32_t aNativeMessage,
double aDeltaX,
double aDeltaY,
double aDeltaZ,
uint32_t aModifierFlags,
uint32_t aAdditionalFlags,
nsIObserver* aObserver) = 0;
/*
* TouchPointerState states for SynthesizeNativeTouchPoint. Match
* touch states in nsIDOMWindowUtils.idl.
*/
enum TouchPointerState {
// The pointer is in a hover state above the digitizer
TOUCH_HOVER = (1 << 0),
// The pointer is in contact with the digitizer
TOUCH_CONTACT = (1 << 1),
// The pointer has been removed from the digitizer detection area
TOUCH_REMOVE = (1 << 2),
// The pointer has been canceled. Will cancel any pending os level
// gestures that would triggered as a result of completion of the
// input sequence. This may not cancel moz platform related events
// that might get tirggered by input already delivered.
TOUCH_CANCEL = (1 << 3),
// ALL_BITS used for validity checking during IPC serialization
ALL_BITS = (1 << 4) - 1
};
/*
* Create a new or update an existing touch pointer on the digitizer.
* To trigger os level gestures, individual touch points should
* transition through a complete set of touch states which should be
* sent as individual messages.
*
* @param aPointerId The touch point id to create or update.
* @param aPointerState one or more of the touch states listed above
* @param aScreenX, aScreenY screen coords of this event
* @param aPressure 0.0 -> 1.0 float val indicating pressure
* @param aOrientation 0 -> 359 degree value indicating the
* orientation of the pointer. Use 90 for normal taps.
* @param aObserver The observer that will get notified once the events
* have been dispatched.
*/
virtual nsresult SynthesizeNativeTouchPoint(uint32_t aPointerId,
TouchPointerState aPointerState,
nsIntPoint aPointerScreenPoint,
double aPointerPressure,
uint32_t aPointerOrientation,
nsIObserver* aObserver) = 0;
/*
* Helper for simulating a simple tap event with one touch point. When
* aLongTap is true, simulates a native long tap with a duration equal to
* ui.click_hold_context_menus.delay. This pref is compatible with the
* apzc long tap duration. Defaults to 1.5 seconds.
* @param aObserver The observer that will get notified once the events
* have been dispatched.
*/
virtual nsresult SynthesizeNativeTouchTap(nsIntPoint aPointerScreenPoint,
bool aLongTap,
nsIObserver* aObserver);
/*
* Cancels all active simulated touch input points and pending long taps.
* Native widgets should track existing points such that they can clear the
* digitizer state when this call is made.
* @param aObserver The observer that will get notified once the touch
* sequence has been cleared.
*/
virtual nsresult ClearNativeTouchSequence(nsIObserver* aObserver);
private:
class LongTapInfo
{
public:
LongTapInfo(int32_t aPointerId, nsIntPoint& aPoint,
mozilla::TimeDuration aDuration,
nsIObserver* aObserver) :
mPointerId(aPointerId),
mPosition(aPoint),
mDuration(aDuration),
mObserver(aObserver),
mStamp(mozilla::TimeStamp::Now())
{
}
int32_t mPointerId;
nsIntPoint mPosition;
mozilla::TimeDuration mDuration;
nsCOMPtr<nsIObserver> mObserver;
mozilla::TimeStamp mStamp;
};
static void OnLongTapTimerCallback(nsITimer* aTimer, void* aClosure);
nsAutoPtr<LongTapInfo> mLongTapTouchPoint;
nsCOMPtr<nsITimer> mLongTapTimer;
static int32_t sPointerIdCounter;
public:
/**
* Activates a native menu item at the position specified by the index
* string. The index string is a string of positive integers separated
* by the "|" (pipe) character. The last integer in the string represents
* the item index in a submenu located using the integers preceding it.
*
* Example: 1|0|4
* In this string, the first integer represents the top-level submenu
* in the native menu bar. Since the integer is 1, it is the second submeu
* in the native menu bar. Within that, the first item (index 0) is a
* submenu, and we want to activate the 5th item within that submenu.
*/
virtual nsresult ActivateNativeMenuItemAt(const nsAString& indexString) = 0;
/**
* This is used for native menu system testing.
*
* Updates a native menu at the position specified by the index string.
* The index string is a string of positive integers separated by the "|"
* (pipe) character.
*
* Example: 1|0|4
* In this string, the first integer represents the top-level submenu
* in the native menu bar. Since the integer is 1, it is the second submeu
* in the native menu bar. Within that, the first item (index 0) is a
* submenu, and we want to update submenu at index 4 within that submenu.
*
* If this is called with an empty string it forces a full reload of the
* menu system.
*/
virtual nsresult ForceUpdateNativeMenuAt(const nsAString& indexString) = 0;
/**
* Notify IME of the specified notification.
*
* @return If the notification is mouse button event and it's consumed by
* IME, this returns NS_SUCCESS_EVENT_CONSUMED.
*/
NS_IMETHOD NotifyIME(const IMENotification& aIMENotification) = 0;
/**
* Start plugin IME. If this results in a string getting committed, the
* result is in aCommitted (otherwise aCommitted is empty).
*
* aKeyboardEvent The event with which plugin IME is to be started
* panelX and panelY Location in screen coordinates of the IME input panel
* (should be just under the plugin)
* aCommitted The string committed during IME -- otherwise empty
*/
NS_IMETHOD StartPluginIME(const mozilla::WidgetKeyboardEvent& aKeyboardEvent,
int32_t aPanelX, int32_t aPanelY,
nsString& aCommitted) = 0;
/**
* Tells the widget whether or not a plugin (inside the widget) has the
* keyboard focus. Should be sent when the keyboard focus changes too or
* from a plugin.
*
* aFocused Whether or not a plugin is focused
*/
NS_IMETHOD SetPluginFocused(bool& aFocused) = 0;
/*
* Notifies the input context changes.
*/
NS_IMETHOD_(void) SetInputContext(const InputContext& aContext,
const InputContextAction& aAction) = 0;
/*
* Get current input context.
*/
NS_IMETHOD_(InputContext) GetInputContext() = 0;
/*
* Given a WidgetKeyboardEvent, this method synthesizes a corresponding
* native (OS-level) event for it. This method allows tests to simulate
* keystrokes that trigger native key bindings (which require a native
* event).
*/
NS_IMETHOD AttachNativeKeyEvent(mozilla::WidgetKeyboardEvent& aEvent) = 0;
/*
* Execute native key bindings for aType.
*/
typedef void (*DoCommandCallback)(mozilla::Command, void*);
enum NativeKeyBindingsType
{
NativeKeyBindingsForSingleLineEditor,
NativeKeyBindingsForMultiLineEditor,
NativeKeyBindingsForRichTextEditor
};
NS_IMETHOD_(bool) ExecuteNativeKeyBinding(
NativeKeyBindingsType aType,
const mozilla::WidgetKeyboardEvent& aEvent,
DoCommandCallback aCallback,
void* aCallbackData) = 0;
/*
* Get toggled key states.
* aKeyCode should be NS_VK_CAPS_LOCK or NS_VK_NUM_LOCK or
* NS_VK_SCROLL_LOCK.
* aLEDState is the result for current LED state of the key.
* If the LED is 'ON', it returns TRUE, otherwise, FALSE.
* If the platform doesn't support the LED state (or we cannot get the
* state), this method returns NS_ERROR_NOT_IMPLEMENTED.
*/
NS_IMETHOD GetToggledKeyState(uint32_t aKeyCode, bool* aLEDState) = 0;
/*
* Retrieves preference for IME updates
*/
virtual nsIMEUpdatePreference GetIMEUpdatePreference() = 0;
/*
* Call this method when a dialog is opened which has a default button.
* The button's rectangle should be supplied in aButtonRect.
*/
NS_IMETHOD OnDefaultButtonLoaded(const nsIntRect &aButtonRect) = 0;
/**
* Compute the overridden system mouse scroll speed on the root content of
* web pages. The widget may set the same value as aOriginalDelta. E.g.,
* when the system scrolling settings were customized, widget can respect
* the will of the user.
*
* This is called only when the mouse wheel event scrolls the root content
* of the web pages by line. In other words, this isn't called when the
* mouse wheel event is used for zoom, page scroll and other special
* actions. And also this isn't called when the user doesn't use the
* system wheel speed settings.
*
* @param aOriginalDeltaX The X delta value of the current mouse wheel
* scrolling event.
* @param aOriginalDeltaX The Y delta value of the current mouse wheel
* scrolling event.
* @param aOverriddenDeltaX The overridden mouse scrolling speed along X
* axis. This value may be same as aOriginalDeltaX.
* @param aOverriddenDeltaY The overridden mouse scrolling speed along Y
* axis. This value may be same as aOriginalDeltaY.
*/
NS_IMETHOD OverrideSystemMouseScrollSpeed(double aOriginalDeltaX,
double aOriginalDeltaY,
double& aOverriddenDeltaX,
double& aOverriddenDeltaY) = 0;
/**
* Return true if this process shouldn't use platform widgets, and
* so should use PuppetWidgets instead. If this returns true, the
* result of creating and using a platform widget is undefined,
* and likely to end in crashes or other buggy behavior.
*/
static bool
UsePuppetWidgets()
{
return XRE_GetProcessType() == GeckoProcessType_Content;
}
/**
* Allocate and return a "puppet widget" that doesn't directly
* correlate to a platform widget; platform events and data must
* be fed to it. Currently used in content processes. NULL is
* returned if puppet widgets aren't supported in this build
* config, on this platform, or for this process type.
*
* This function is called "Create" to match CreateInstance().
* The returned widget must still be nsIWidget::Create()d.
*/
static already_AddRefed<nsIWidget>
CreatePuppetWidget(TabChild* aTabChild);
/**
* Allocate and return a "plugin proxy widget", a subclass of PuppetWidget
* used in wrapping a PPluginWidget connection for remote widgets. Note
* this call creates the base object, it does not create the widget. Use
* nsIWidget's Create to do this.
*/
static already_AddRefed<nsIWidget>
CreatePluginProxyWidget(TabChild* aTabChild,
mozilla::plugins::PluginWidgetChild* aActor);
/**
* Reparent this widget's native widget.
* @param aNewParent the native widget of aNewParent is the new native
* parent widget
*/
NS_IMETHOD ReparentNativeWidget(nsIWidget* aNewParent) = 0;
/**
* Return the internal format of the default framebuffer for this
* widget.
*/
virtual uint32_t GetGLFrameBufferFormat() { return 0; /*GL_NONE*/ }
/**
* Return true if widget has it's own GL context
*/
virtual bool HasGLContext() { return false; }
/**
* Returns true to indicate that this widget paints an opaque background
* that we want to be visible under the page, so layout should not force
* a default background.
*/
virtual bool WidgetPaintsBackground() { return false; }
virtual bool NeedsPaint() {
if (!IsVisible()) {
return false;
}
nsIntRect bounds;
nsresult rv = GetBounds(bounds);
NS_ENSURE_SUCCESS(rv, false);
return !bounds.IsEmpty();
}
/**
* Get the natural bounds of this widget. This method is only
* meaningful for widgets for which Gecko implements screen
* rotation natively. When this is the case, GetBounds() returns
* the widget bounds taking rotation into account, and
* GetNaturalBounds() returns the bounds *not* taking rotation
* into account.
*
* No code outside of the composition pipeline should know or care
* about this. If you're not an agent of the compositor, you
* probably shouldn't call this method.
*/
virtual nsIntRect GetNaturalBounds() {
nsIntRect bounds;
GetBounds(bounds);
return bounds;
}
/**
* Set size constraints on the window size such that it is never less than
* the specified minimum size and never larger than the specified maximum
* size. The size constraints are sizes of the outer rectangle including
* the window frame and title bar. Use 0 for an unconstrained minimum size
* and NS_MAXSIZE for an unconstrained maximum size. Note that this method
* does not necessarily change the size of a window to conform to this size,
* thus Resize should be called afterwards.
*
* @param aConstraints: the size constraints in device pixels
*/
virtual void SetSizeConstraints(const SizeConstraints& aConstraints) = 0;
/**
* Return the size constraints currently observed by the widget.
*
* @return the constraints in device pixels
*/
virtual const SizeConstraints& GetSizeConstraints() const = 0;
/**
* If this is owned by a TabChild, return that. Otherwise return
* null.
*/
virtual TabChild* GetOwningTabChild() { return nullptr; }
/**
* If this isn't directly compositing to its window surface,
* return the compositor which is doing that on our behalf.
*/
virtual CompositorChild* GetRemoteRenderer()
{ return nullptr; }
/**
* If this widget has a more efficient composer available for its
* native framebuffer, return it.
*
* This can be called from a non-main thread, but that thread must
* hold a strong reference to this.
*/
virtual Composer2D* GetComposer2D()
{ return nullptr; }
/**
* Some platforms (only cocoa right now) round widget coordinates to the
* nearest even pixels (see bug 892994), this function allows us to
* determine how widget coordinates will be rounded.
*/
virtual int32_t RoundsWidgetCoordinatesTo() { return 1; }
/**
* GetTextEventDispatcher() returns TextEventDispatcher belonging to the
* widget. Note that this never returns nullptr.
*/
NS_IMETHOD_(TextEventDispatcher*) GetTextEventDispatcher() = 0;
protected:
/**
* Like GetDefaultScale, but taking into account only the system settings
* and ignoring Gecko preferences.
*/
virtual double GetDefaultScaleInternal() { return 1.0; }
// keep the list of children. We also keep track of our siblings.
// The ownership model is as follows: parent holds a strong ref to
// the first element of the list, and each element holds a strong
// ref to the next element in the list. The prevsibling and
// lastchild pointers are weak, which is fine as long as they are
// maintained properly.
nsCOMPtr<nsIWidget> mFirstChild;
nsIWidget* MOZ_NON_OWNING_REF mLastChild;
nsCOMPtr<nsIWidget> mNextSibling;
nsIWidget* MOZ_NON_OWNING_REF mPrevSibling;
// When Destroy() is called, the sub class should set this true.
bool mOnDestroyCalled;
nsWindowType mWindowType;
int32_t mZIndex;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIWidget, NS_IWIDGET_IID)
#endif // nsIWidget_h__
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