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gecko-dev/layout/base/nsIPresShell.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* 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/.
*
* This Original Code has been modified by IBM Corporation.
* Modifications made by IBM described herein are
* Copyright (c) International Business Machines
* Corporation, 2000
*
* Modifications to Mozilla code or documentation
* identified per MPL Section 3.3
*
* Date Modified by Description of modification
* 05/03/2000 IBM Corp. Observer related defines for reflow
*/
/* a presentation of a document, part 2 */
#ifndef nsIPresShell_h___
#define nsIPresShell_h___
#include "mozilla/ArenaObjectID.h"
#include "mozilla/EventForwards.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/StyleSetHandle.h"
#include "mozilla/StyleSheetHandle.h"
#include "mozilla/WeakPtr.h"
#include "gfxPoint.h"
#include "nsTHashtable.h"
#include "nsHashKeys.h"
#include "nsISupports.h"
#include "nsIContent.h"
#include "nsQueryFrame.h"
#include "nsCoord.h"
#include "nsColor.h"
#include "nsFrameManagerBase.h"
#include "nsRect.h"
#include "nsRegionFwd.h"
#include "mozFlushType.h"
#include "nsWeakReference.h"
#include <stdio.h> // for FILE definition
#include "nsChangeHint.h"
#include "nsRefPtrHashtable.h"
#include "nsClassHashtable.h"
#include "nsPresArena.h"
#include "nsMargin.h"
#include "nsFrameState.h"
#ifdef MOZ_B2G
#include "nsIHardwareKeyHandler.h"
#endif
class nsDocShell;
class nsIDocument;
class nsIFrame;
class nsPresContext;
class nsViewManager;
class nsView;
class nsRenderingContext;
class nsIPageSequenceFrame;
class nsCanvasFrame;
class nsAString;
class nsCaret;
namespace mozilla {
class AccessibleCaretEventHub;
class CSSStyleSheet;
} // namespace mozilla
class nsFrameSelection;
class nsFrameManager;
class nsILayoutHistoryState;
class nsIReflowCallback;
class nsIDOMNode;
class nsCSSFrameConstructor;
class nsISelection;
template<class E> class nsCOMArray;
class nsWeakFrame;
class nsIScrollableFrame;
class gfxContext;
class nsIDOMEvent;
class nsDisplayList;
class nsDisplayListBuilder;
class nsPIDOMWindowOuter;
struct nsPoint;
class nsINode;
struct nsRect;
class nsRegion;
class nsRefreshDriver;
class nsARefreshObserver;
class nsAPostRefreshObserver;
#ifdef ACCESSIBILITY
class nsAccessibilityService;
namespace mozilla {
namespace a11y {
class DocAccessible;
} // namespace a11y
} // namespace mozilla
#endif
struct nsArenaMemoryStats;
class nsITimer;
typedef short SelectionType;
namespace mozilla {
class EventStates;
namespace dom {
class Element;
class Touch;
class Selection;
class ShadowRoot;
} // namespace dom
namespace layers {
class LayerManager;
} // namespace layers
namespace gfx {
class SourceSurface;
} // namespace gfx
} // namespace mozilla
// Flags to pass to SetCapturingContent
//
// when assigning capture, ignore whether capture is allowed or not
#define CAPTURE_IGNOREALLOWED 1
// true if events should be targeted at the capturing content or its children
#define CAPTURE_RETARGETTOELEMENT 2
// true if the current capture wants drags to be prevented
#define CAPTURE_PREVENTDRAG 4
// true when the mouse is pointer locked, and events are sent to locked element
#define CAPTURE_POINTERLOCK 8
typedef struct CapturingContentInfo {
// capture should only be allowed during a mousedown event
bool mAllowed;
bool mPointerLock;
bool mRetargetToElement;
bool mPreventDrag;
mozilla::StaticRefPtr<nsIContent> mContent;
} CapturingContentInfo;
// a75573d6-34c8-4485-8fb7-edcb6fc70e12
#define NS_IPRESSHELL_IID \
{ 0xa75573d6, 0x34c8, 0x4485, \
{ 0x8f, 0xb7, 0xed, 0xcb, 0x6f, 0xc7, 0x0e, 0x12 } }
// debug VerifyReflow flags
#define VERIFY_REFLOW_ON 0x01
#define VERIFY_REFLOW_NOISY 0x02
#define VERIFY_REFLOW_ALL 0x04
#define VERIFY_REFLOW_DUMP_COMMANDS 0x08
#define VERIFY_REFLOW_NOISY_RC 0x10
#define VERIFY_REFLOW_REALLY_NOISY_RC 0x20
#define VERIFY_REFLOW_DURING_RESIZE_REFLOW 0x40
#undef NOISY_INTERRUPTIBLE_REFLOW
enum nsRectVisibility {
nsRectVisibility_kVisible,
nsRectVisibility_kAboveViewport,
nsRectVisibility_kBelowViewport,
nsRectVisibility_kLeftOfViewport,
nsRectVisibility_kRightOfViewport
};
/**
* Presentation shell interface. Presentation shells are the
* controlling point for managing the presentation of a document. The
* presentation shell holds a live reference to the document, the
* presentation context, the style manager, the style set and the root
* frame. <p>
*
* When this object is Release'd, it will release the document, the
* presentation context, the style manager, the style set and the root
* frame.
*/
class nsIPresShell : public nsISupports
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_IPRESSHELL_IID)
protected:
typedef mozilla::layers::LayerManager LayerManager;
typedef mozilla::gfx::SourceSurface SourceSurface;
enum eRenderFlag {
STATE_IGNORING_VIEWPORT_SCROLLING = 0x1,
STATE_DRAWWINDOW_NOT_FLUSHING = 0x2
};
typedef uint8_t RenderFlags; // for storing the above flags
public:
/**
* All callers are responsible for calling |Destroy| after calling
* |EndObservingDocument|. It needs to be separate only because form
* controls incorrectly store their data in the frames rather than the
* content model and printing calls |EndObservingDocument| multiple
* times to make form controls behave nicely when printed.
*/
virtual void Destroy() = 0;
bool IsDestroying() { return mIsDestroying; }
/**
* Make a one-way transition into a "zombie" state. In this state,
* no reflow is done, no painting is done, and no refresh driver
* ticks are processed. This is a dangerous state: it can leave
* areas of the composition target unpainted if callers aren't
* careful. (Don't let your zombie presshell out of the shed.)
*
* This is used in cases where a presshell is created for reasons
* other than reflow/painting.
*/
virtual void MakeZombie() = 0;
/**
* All frames owned by the shell are allocated from an arena. They
* are also recycled using free lists. Separate free lists are
* maintained for each frame type (aID), which must always correspond
* to the same aSize value. AllocateFrame returns zero-filled memory.
* AllocateFrame is infallible and will abort on out-of-memory.
*/
void* AllocateFrame(nsQueryFrame::FrameIID aID, size_t aSize)
{
#ifdef DEBUG
mPresArenaAllocCount++;
#endif
void* result = mFrameArena.AllocateByFrameID(aID, aSize);
memset(result, 0, aSize);
return result;
}
void FreeFrame(nsQueryFrame::FrameIID aID, void* aPtr)
{
#ifdef DEBUG
mPresArenaAllocCount--;
#endif
if (!mIsDestroying)
mFrameArena.FreeByFrameID(aID, aPtr);
}
/**
* This is for allocating other types of objects (not frames). Separate free
* lists are maintained for each type (aID), which must always correspond to
* the same aSize value. AllocateByObjectID returns zero-filled memory.
* AllocateByObjectID is infallible and will abort on out-of-memory.
*/
void* AllocateByObjectID(mozilla::ArenaObjectID aID, size_t aSize)
{
#ifdef DEBUG
mPresArenaAllocCount++;
#endif
void* result = mFrameArena.AllocateByObjectID(aID, aSize);
memset(result, 0, aSize);
return result;
}
void FreeByObjectID(mozilla::ArenaObjectID aID, void* aPtr)
{
#ifdef DEBUG
mPresArenaAllocCount--;
#endif
if (!mIsDestroying)
mFrameArena.FreeByObjectID(aID, aPtr);
}
/**
* Other objects closely related to the frame tree that are allocated
* from a separate set of per-size free lists. Note that different types
* of objects that has the same size are allocated from the same list.
* AllocateMisc does *not* clear the memory that it returns.
* AllocateMisc is infallible and will abort on out-of-memory.
*
* @deprecated use AllocateByObjectID/FreeByObjectID instead
*/
void* AllocateMisc(size_t aSize)
{
#ifdef DEBUG
mPresArenaAllocCount++;
#endif
return mFrameArena.AllocateBySize(aSize);
}
void FreeMisc(size_t aSize, void* aPtr)
{
#ifdef DEBUG
mPresArenaAllocCount--;
#endif
if (!mIsDestroying)
mFrameArena.FreeBySize(aSize, aPtr);
}
template<typename T>
void RegisterArenaRefPtr(mozilla::ArenaRefPtr<T>* aPtr)
{
mFrameArena.RegisterArenaRefPtr(aPtr);
}
template<typename T>
void DeregisterArenaRefPtr(mozilla::ArenaRefPtr<T>* aPtr)
{
mFrameArena.DeregisterArenaRefPtr(aPtr);
}
void ClearArenaRefPtrs(mozilla::ArenaObjectID aObjectID)
{
mFrameArena.ClearArenaRefPtrs(aObjectID);
}
nsIDocument* GetDocument() const { return mDocument; }
nsPresContext* GetPresContext() const { return mPresContext; }
nsViewManager* GetViewManager() const { return mViewManager; }
#ifdef ACCESSIBILITY
/**
* Return the document accessible for this pres shell if there is one.
*/
mozilla::a11y::DocAccessible* GetDocAccessible() const
{
return mDocAccessible;
}
/**
* Set the document accessible for this pres shell.
*/
void SetDocAccessible(mozilla::a11y::DocAccessible* aDocAccessible)
{
mDocAccessible = aDocAccessible;
}
#endif
#ifdef MOZILLA_INTERNAL_API
mozilla::StyleSetHandle StyleSet() const { return mStyleSet; }
nsCSSFrameConstructor* FrameConstructor() const { return mFrameConstructor; }
nsFrameManager* FrameManager() const {
// reinterpret_cast is valid since nsFrameManager does not add
// any members over nsFrameManagerBase.
return reinterpret_cast<nsFrameManager*>
(const_cast<nsIPresShell*>(this)->mFrameManager);
}
#endif
/* Enable/disable author style level. Disabling author style disables the entire
* author level of the cascade, including the HTML preshint level.
*/
// XXX these could easily be inlined, but there is a circular #include
// problem with nsStyleSet.
void SetAuthorStyleDisabled(bool aDisabled);
bool GetAuthorStyleDisabled() const;
/*
* Called when stylesheets are added/removed/enabled/disabled to
* recompute style and clear other cached data as needed. This will
* not reconstruct style synchronously; if you need to do that, call
* FlushPendingNotifications to flush out style reresolves.
*
* This handles the the addition and removal of the various types of
* style rules that can be in CSS style sheets, such as @font-face
* rules and @counter-style rules.
*
* It requires that StyleSheetAdded, StyleSheetRemoved,
* StyleSheetApplicableStateChanged, StyleRuleAdded, StyleRuleRemoved,
* or StyleRuleChanged has been called on the style sheets that have
* changed.
*
* // XXXbz why do we have this on the interface anyway? The only consumer
* is calling AddOverrideStyleSheet/RemoveOverrideStyleSheet, and I think
* those should just handle reconstructing style data...
*/
void RestyleForCSSRuleChanges();
/**
* Update the style set somehow to take into account changed prefs which
* affect document styling.
*/
virtual void UpdatePreferenceStyles() = 0;
/**
* FrameSelection will return the Frame based selection API.
* You cannot go back and forth anymore with QI between nsIDOM sel and
* nsIFrame sel.
*/
already_AddRefed<nsFrameSelection> FrameSelection();
/**
* ConstFrameSelection returns an object which methods are safe to use for
* example in nsIFrame code.
*/
const nsFrameSelection* ConstFrameSelection() const { return mSelection; }
// Make shell be a document observer. If called after Destroy() has
// been called on the shell, this will be ignored.
virtual void BeginObservingDocument() = 0;
// Make shell stop being a document observer
virtual void EndObservingDocument() = 0;
/**
* Return whether Initialize() was previously called.
*/
bool DidInitialize() const { return mDidInitialize; }
/**
* Perform initialization. Constructs the frame for the root content
* object and then enqueues a reflow of the frame model into the
* specified width and height.
*
* The coordinates for aWidth and aHeight must be in standard nscoords.
*
* Callers of this method must hold a reference to this shell that
* is guaranteed to survive through arbitrary script execution.
* Calling Initialize can execute arbitrary script.
*/
virtual nsresult Initialize(nscoord aWidth, nscoord aHeight) = 0;
/**
* Reflow the frame model into a new width and height. The
* coordinates for aWidth and aHeight must be in standard nscoord's.
*/
virtual nsresult ResizeReflow(nscoord aWidth, nscoord aHeight) = 0;
/**
* Do the same thing as ResizeReflow but even if ResizeReflowOverride was
* called previously.
*/
virtual nsresult ResizeReflowIgnoreOverride(nscoord aWidth, nscoord aHeight) = 0;
/**
* Returns true if ResizeReflowOverride has been called.
*/
virtual bool GetIsViewportOverridden() = 0;
/**
* Return true if the presshell expects layout flush.
*/
virtual bool IsLayoutFlushObserver() = 0;
/**
* Called when document load completes.
*/
virtual void LoadComplete() = 0;
/**
* This calls through to the frame manager to get the root frame.
*/
virtual nsIFrame* GetRootFrameExternal() const;
nsIFrame* GetRootFrame() const {
#ifdef MOZILLA_INTERNAL_API
return mFrameManager->GetRootFrame();
#else
return GetRootFrameExternal();
#endif
}
/*
* Get root scroll frame from FrameManager()->GetRootFrame().
*/
nsIFrame* GetRootScrollFrame() const;
/*
* The same as GetRootScrollFrame, but returns an nsIScrollableFrame
*/
nsIScrollableFrame* GetRootScrollFrameAsScrollable() const;
/*
* The same as GetRootScrollFrame, but returns an nsIScrollableFrame.
* Can be called by code not linked into gklayout.
*/
virtual nsIScrollableFrame* GetRootScrollFrameAsScrollableExternal() const;
/*
* Gets nearest scrollable frame from current focused content or DOM
* selection if there is no focused content. The frame is scrollable with
* overflow:scroll or overflow:auto in some direction when aDirection is
* eEither. Otherwise, this returns a nearest frame that is scrollable in
* the specified direction.
*/
enum ScrollDirection { eHorizontal, eVertical, eEither };
nsIScrollableFrame* GetFrameToScrollAsScrollable(ScrollDirection aDirection);
/**
* Returns the page sequence frame associated with the frame hierarchy.
* Returns nullptr if not a paginated view.
*/
virtual nsIPageSequenceFrame* GetPageSequenceFrame() const = 0;
/**
* Returns the canvas frame associated with the frame hierarchy.
* Returns nullptr if is XUL document.
*/
virtual nsCanvasFrame* GetCanvasFrame() const = 0;
/**
* Gets the placeholder frame associated with the specified frame. This is
* a helper frame that forwards the request to the frame manager.
*/
virtual nsIFrame* GetPlaceholderFrameFor(nsIFrame* aFrame) const = 0;
/**
* Tell the pres shell that a frame needs to be marked dirty and needs
* Reflow. It's OK if this is an ancestor of the frame needing reflow as
* long as the ancestor chain between them doesn't cross a reflow root.
*
* The bit to add should be NS_FRAME_IS_DIRTY, NS_FRAME_HAS_DIRTY_CHILDREN
* or nsFrameState(0); passing 0 means that dirty bits won't be set on the
* frame or its ancestors/descendants, but that intrinsic widths will still
* be marked dirty. Passing aIntrinsicDirty = eResize and aBitToAdd = 0
* would result in no work being done, so don't do that.
*/
enum IntrinsicDirty {
// XXXldb eResize should be renamed
eResize, // don't mark any intrinsic widths dirty
eTreeChange, // mark intrinsic widths dirty on aFrame and its ancestors
eStyleChange // Do eTreeChange, plus all of aFrame's descendants
};
enum ReflowRootHandling {
ePositionOrSizeChange, // aFrame is changing position or size
eNoPositionOrSizeChange, // ... NOT changing ...
eInferFromBitToAdd // is changing iff (aBitToAdd == NS_FRAME_IS_DIRTY)
// Note: With eStyleChange, these can also apply to out-of-flows
// in addition to aFrame.
};
virtual void FrameNeedsReflow(nsIFrame *aFrame,
IntrinsicDirty aIntrinsicDirty,
nsFrameState aBitToAdd,
ReflowRootHandling aRootHandling =
eInferFromBitToAdd) = 0;
/**
* Calls FrameNeedsReflow on all fixed position children of the root frame.
*/
virtual void MarkFixedFramesForReflow(IntrinsicDirty aIntrinsicDirty);
/**
* Tell the presshell that the given frame's reflow was interrupted. This
* will mark as having dirty children a path from the given frame (inclusive)
* to the nearest ancestor with a dirty subtree, or to the reflow root
* currently being reflowed if no such ancestor exists (inclusive). This is
* to be done immediately after reflow of the current reflow root completes.
* This method must only be called during reflow, and the frame it's being
* called on must be in the process of being reflowed when it's called. This
* method doesn't mark any intrinsic widths dirty and doesn't add any bits
* other than NS_FRAME_HAS_DIRTY_CHILDREN.
*/
virtual void FrameNeedsToContinueReflow(nsIFrame *aFrame) = 0;
virtual void CancelAllPendingReflows() = 0;
virtual void NotifyCounterStylesAreDirty() = 0;
/**
* Destroy the frames for aContent. Note that this may destroy frames
* for an ancestor instead - aDestroyedFramesFor contains the content node
* where frames were actually destroyed (which should be used in the
* CreateFramesFor call). The frame tree state will be captured before
* the frames are destroyed in the frame constructor.
*/
virtual void DestroyFramesFor(nsIContent* aContent,
nsIContent** aDestroyedFramesFor) = 0;
/**
* Create new frames for aContent. It will use the last captured layout
* history state captured in the frame constructor to restore the state
* in the new frame tree.
*/
virtual void CreateFramesFor(nsIContent* aContent) = 0;
/**
* Recreates the frames for a node
*/
virtual nsresult RecreateFramesFor(nsIContent* aContent) = 0;
void PostRecreateFramesFor(mozilla::dom::Element* aElement);
void RestyleForAnimation(mozilla::dom::Element* aElement,
nsRestyleHint aHint);
// ShadowRoot has APIs that can change styles so we only
// want to restyle elements in the ShadowRoot and not the whole
// document.
virtual void RecordShadowStyleChange(mozilla::dom::ShadowRoot* aShadowRoot) = 0;
/**
* Determine if it is safe to flush all pending notifications
* @param aIsSafeToFlush true if it is safe, false otherwise.
*
*/
virtual bool IsSafeToFlush() const = 0;
/**
* Flush pending notifications of the type specified. This method
* will not affect the content model; it'll just affect style and
* frames. Callers that actually want up-to-date presentation (other
* than the document itself) should probably be calling
* nsIDocument::FlushPendingNotifications.
*
* @param aType the type of notifications to flush
*/
virtual void FlushPendingNotifications(mozFlushType aType) = 0;
virtual void FlushPendingNotifications(mozilla::ChangesToFlush aType) = 0;
/**
* Callbacks will be called even if reflow itself fails for
* some reason.
*/
virtual nsresult PostReflowCallback(nsIReflowCallback* aCallback) = 0;
virtual void CancelReflowCallback(nsIReflowCallback* aCallback) = 0;
virtual void ClearFrameRefs(nsIFrame* aFrame) = 0;
/**
* Get a reference rendering context. This is a context that should not
* be rendered to, but is suitable for measuring text and performing
* other non-rendering operations. Guaranteed to return non-null.
*/
virtual already_AddRefed<gfxContext> CreateReferenceRenderingContext() = 0;
/**
* Informs the pres shell that the document is now at the anchor with
* the given name. If |aScroll| is true, scrolls the view of the
* document so that the anchor with the specified name is displayed at
* the top of the window. If |aAnchorName| is empty, then this informs
* the pres shell that there is no current target, and |aScroll| must
* be false. If |aAdditionalScrollFlags| is nsIPresShell::SCROLL_SMOOTH_AUTO
* and |aScroll| is true, the scrolling may be performed with an animation.
*/
virtual nsresult GoToAnchor(const nsAString& aAnchorName, bool aScroll,
uint32_t aAdditionalScrollFlags = 0) = 0;
/**
* Tells the presshell to scroll again to the last anchor scrolled to by
* GoToAnchor, if any. This scroll only happens if the scroll
* position has not changed since the last GoToAnchor. This is called
* by nsDocumentViewer::LoadComplete. This clears the last anchor
* scrolled to by GoToAnchor (we don't want to keep it alive if it's
* removed from the DOM), so don't call this more than once.
*/
virtual nsresult ScrollToAnchor() = 0;
enum {
SCROLL_TOP = 0,
SCROLL_BOTTOM = 100,
SCROLL_LEFT = 0,
SCROLL_RIGHT = 100,
SCROLL_CENTER = 50,
SCROLL_MINIMUM = -1
};
enum WhenToScroll {
SCROLL_ALWAYS,
SCROLL_IF_NOT_VISIBLE,
SCROLL_IF_NOT_FULLY_VISIBLE
};
typedef struct ScrollAxis {
int16_t mWhereToScroll;
WhenToScroll mWhenToScroll : 8;
bool mOnlyIfPerceivedScrollableDirection : 1;
/**
* @param aWhere: Either a percentage or a special value.
* nsIPresShell defines:
* * (Default) SCROLL_MINIMUM = -1: The visible area is
* scrolled to show the entire frame. If the frame is too
* large, the top and left edges are given precedence.
* * SCROLL_TOP = 0: The frame's upper edge is aligned with the
* top edge of the visible area.
* * SCROLL_BOTTOM = 100: The frame's bottom edge is aligned
* with the bottom edge of the visible area.
* * SCROLL_LEFT = 0: The frame's left edge is aligned with the
* left edge of the visible area.
* * SCROLL_RIGHT = 100: The frame's right edge is aligned with
* the right edge of the visible area.
* * SCROLL_CENTER = 50: The frame is centered along the axis
* the ScrollAxis is used for.
*
* Other values are treated as a percentage, and the point
* "percent" down the frame is placed at the point "percent"
* down the visible area.
* @param aWhen:
* * (Default) SCROLL_IF_NOT_FULLY_VISIBLE: Move the frame only
* if it is not fully visible (including if it's not visible
* at all). Note that in this case if the frame is too large to
* fit in view, it will only be scrolled if more of it can fit
* than is already in view.
* * SCROLL_IF_NOT_VISIBLE: Move the frame only if none of it
* is visible.
* * SCROLL_ALWAYS: Move the frame regardless of its current
* visibility.
* @param aOnlyIfPerceivedScrollableDirection:
* If the direction is not a perceived scrollable direction (i.e.
* no scrollbar showing and less than one device pixel of
* scrollable distance), don't scroll. Defaults to false.
*/
explicit ScrollAxis(int16_t aWhere = SCROLL_MINIMUM,
WhenToScroll aWhen = SCROLL_IF_NOT_FULLY_VISIBLE,
bool aOnlyIfPerceivedScrollableDirection = false) :
mWhereToScroll(aWhere), mWhenToScroll(aWhen),
mOnlyIfPerceivedScrollableDirection(aOnlyIfPerceivedScrollableDirection)
{}
} ScrollAxis;
/**
* Scrolls the view of the document so that the primary frame of the content
* is displayed in the window. Layout is flushed before scrolling.
*
* @param aContent The content object of which primary frame should be
* scrolled into view.
* @param aVertical How to align the frame vertically and when to do so.
* This is a ScrollAxis of Where and When.
* @param aHorizontal How to align the frame horizontally and when to do so.
* This is a ScrollAxis of Where and When.
* @param aFlags If SCROLL_FIRST_ANCESTOR_ONLY is set, only the nearest
* scrollable ancestor is scrolled, otherwise all
* scrollable ancestors may be scrolled if necessary.
* If SCROLL_OVERFLOW_HIDDEN is set then we may scroll in a
* direction even if overflow:hidden is specified in that
* direction; otherwise we will not scroll in that direction
* when overflow:hidden is set for that direction.
* If SCROLL_NO_PARENT_FRAMES is set then we only scroll
* nodes in this document, not in any parent documents which
* contain this document in a iframe or the like.
* If SCROLL_SMOOTH is set and CSSOM-VIEW scroll-behavior
* is enabled, we will scroll smoothly using
* nsIScrollableFrame::ScrollMode::SMOOTH_MSD; otherwise,
* nsIScrollableFrame::ScrollMode::INSTANT will be used.
* If SCROLL_SMOOTH_AUTO is set, the CSSOM-View
* scroll-behavior attribute is set to 'smooth' on the
* scroll frame, and CSSOM-VIEW scroll-behavior is enabled,
* we will scroll smoothly using
* nsIScrollableFrame::ScrollMode::SMOOTH_MSD; otherwise,
* nsIScrollableFrame::ScrollMode::INSTANT will be used.
*/
virtual nsresult ScrollContentIntoView(nsIContent* aContent,
ScrollAxis aVertical,
ScrollAxis aHorizontal,
uint32_t aFlags) = 0;
enum {
SCROLL_FIRST_ANCESTOR_ONLY = 0x01,
SCROLL_OVERFLOW_HIDDEN = 0x02,
SCROLL_NO_PARENT_FRAMES = 0x04,
SCROLL_SMOOTH = 0x08,
SCROLL_SMOOTH_AUTO = 0x10
};
/**
* Scrolls the view of the document so that the given area of a frame
* is visible, if possible. Layout is not flushed before scrolling.
*
* @param aRect relative to aFrame
* @param aVertical see ScrollContentIntoView and ScrollAxis
* @param aHorizontal see ScrollContentIntoView and ScrollAxis
* @param aFlags if SCROLL_FIRST_ANCESTOR_ONLY is set, only the
* nearest scrollable ancestor is scrolled, otherwise all
* scrollable ancestors may be scrolled if necessary
* if SCROLL_OVERFLOW_HIDDEN is set then we may scroll in a direction
* even if overflow:hidden is specified in that direction; otherwise
* we will not scroll in that direction when overflow:hidden is
* set for that direction
* If SCROLL_NO_PARENT_FRAMES is set then we only scroll
* nodes in this document, not in any parent documents which
* contain this document in a iframe or the like.
* @return true if any scrolling happened, false if no scrolling happened
*/
virtual bool ScrollFrameRectIntoView(nsIFrame* aFrame,
const nsRect& aRect,
ScrollAxis aVertical,
ScrollAxis aHorizontal,
uint32_t aFlags) = 0;
/**
* Determine if a rectangle specified in the frame's coordinate system
* intersects the viewport "enough" to be considered visible.
* @param aFrame frame that aRect coordinates are specified relative to
* @param aRect rectangle in twips to test for visibility
* @param aMinTwips is the minimum distance in from the edge of the viewport
* that an object must be to be counted visible
* @return nsRectVisibility_kVisible if the rect is visible
* nsRectVisibility_kAboveViewport
* nsRectVisibility_kBelowViewport
* nsRectVisibility_kLeftOfViewport
* nsRectVisibility_kRightOfViewport rectangle is outside the viewport
* in the specified direction
*/
virtual nsRectVisibility GetRectVisibility(nsIFrame *aFrame,
const nsRect &aRect,
nscoord aMinTwips) const = 0;
/**
* Suppress notification of the frame manager that frames are
* being destroyed.
*/
virtual void SetIgnoreFrameDestruction(bool aIgnore) = 0;
/**
* Notification sent by a frame informing the pres shell that it is about to
* be destroyed.
* This allows any outstanding references to the frame to be cleaned up
*/
virtual void NotifyDestroyingFrame(nsIFrame* aFrame) = 0;
/**
* Get the AccessibleCaretEventHub, if it exists. AddRefs it.
*/
virtual already_AddRefed<mozilla::AccessibleCaretEventHub> GetAccessibleCaretEventHub() const = 0;
/**
* Get the caret, if it exists. AddRefs it.
*/
virtual already_AddRefed<nsCaret> GetCaret() const = 0;
/**
* Set the current caret to a new caret. To undo this, call RestoreCaret.
*/
virtual void SetCaret(nsCaret *aNewCaret) = 0;
/**
* Restore the caret to the original caret that this pres shell was created
* with.
*/
virtual void RestoreCaret() = 0;
/**
* Should the images have borders etc. Actual visual effects are determined
* by the frames. Visual effects may not effect layout, only display.
* Takes effect on next repaint, does not force a repaint itself.
*
* @param aInEnable if true, visual selection effects are enabled
* if false visual selection effects are disabled
*/
NS_IMETHOD SetSelectionFlags(int16_t aInEnable) = 0;
/**
* Gets the current state of non text selection effects
* @return current state of non text selection,
* as set by SetDisplayNonTextSelection
*/
int16_t GetSelectionFlags() const { return mSelectionFlags; }
virtual mozilla::dom::Selection* GetCurrentSelection(SelectionType aType) = 0;
/**
* Interface to dispatch events via the presshell
* @note The caller must have a strong reference to the PresShell.
*/
virtual nsresult HandleEventWithTarget(
mozilla::WidgetEvent* aEvent,
nsIFrame* aFrame,
nsIContent* aContent,
nsEventStatus* aStatus) = 0;
/**
* Dispatch event to content only (NOT full processing)
* @note The caller must have a strong reference to the PresShell.
*/
virtual nsresult HandleDOMEventWithTarget(
nsIContent* aTargetContent,
mozilla::WidgetEvent* aEvent,
nsEventStatus* aStatus) = 0;
/**
* Dispatch event to content only (NOT full processing)
* @note The caller must have a strong reference to the PresShell.
*/
virtual nsresult HandleDOMEventWithTarget(nsIContent* aTargetContent,
nsIDOMEvent* aEvent,
nsEventStatus* aStatus) = 0;
/**
* Dispatch AfterKeyboardEvent with specific target.
*/
virtual void DispatchAfterKeyboardEvent(nsINode* aTarget,
const mozilla::WidgetKeyboardEvent& aEvent,
bool aEmbeddedCancelled) = 0;
/**
* Return whether or not the event is valid to be dispatched
*/
virtual bool CanDispatchEvent(
const mozilla::WidgetGUIEvent* aEvent = nullptr) const = 0;
/**
* Gets the current target event frame from the PresShell
*/
virtual nsIFrame* GetEventTargetFrame() = 0;
/**
* Gets the current target event frame from the PresShell
*/
virtual already_AddRefed<nsIContent> GetEventTargetContent(
mozilla::WidgetEvent* aEvent) = 0;
/**
* Get and set the history state for the current document
*/
virtual nsresult CaptureHistoryState(nsILayoutHistoryState** aLayoutHistoryState) = 0;
/**
* Determine if reflow is currently locked
* returns true if reflow is locked, false otherwise
*/
bool IsReflowLocked() const { return mIsReflowing; }
/**
* Called to find out if painting is suppressed for this presshell. If it is suppressd,
* we don't allow the painting of any layer but the background, and we don't
* recur into our children.
*/
bool IsPaintingSuppressed() const { return mPaintingSuppressed; }
/**
* Pause painting by freezing the refresh driver of this and all parent
* presentations. This may not have the desired effect if this pres shell
* has its own refresh driver.
*/
virtual void PausePainting() = 0;
/**
* Resume painting by thawing the refresh driver of this and all parent
* presentations. This may not have the desired effect if this pres shell
* has its own refresh driver.
*/
virtual void ResumePainting() = 0;
/**
* Unsuppress painting.
*/
virtual void UnsuppressPainting() = 0;
/**
* Called to disable nsITheme support in a specific presshell.
*/
void DisableThemeSupport()
{
// Doesn't have to be dynamic. Just set the bool.
mIsThemeSupportDisabled = true;
}
/**
* Indicates whether theme support is enabled.
*/
bool IsThemeSupportEnabled() const { return !mIsThemeSupportDisabled; }
/**
* Get the set of agent style sheets for this presentation
*/
virtual nsresult GetAgentStyleSheets(
nsTArray<mozilla::StyleSheetHandle::RefPtr>& aSheets) = 0;
/**
* Replace the set of agent style sheets
*/
virtual nsresult SetAgentStyleSheets(
const nsTArray<mozilla::StyleSheetHandle::RefPtr>& aSheets) = 0;
/**
* Add an override style sheet for this presentation
*/
virtual nsresult AddOverrideStyleSheet(mozilla::StyleSheetHandle aSheet) = 0;
/**
* Remove an override style sheet
*/
virtual nsresult RemoveOverrideStyleSheet(mozilla::StyleSheetHandle aSheet) = 0;
/**
* Reconstruct frames for all elements in the document
*/
virtual nsresult ReconstructFrames() = 0;
/**
* Notify that a content node's state has changed
*/
virtual void ContentStateChanged(nsIDocument* aDocument,
nsIContent* aContent,
mozilla::EventStates aStateMask) = 0;
/**
* See if reflow verification is enabled. To enable reflow verification add
* "verifyreflow:1" to your NSPR_LOG_MODULES environment variable
* (any non-zero debug level will work). Or, call SetVerifyReflowEnable
* with true.
*/
static bool GetVerifyReflowEnable();
/**
* Set the verify-reflow enable flag.
*/
static void SetVerifyReflowEnable(bool aEnabled);
virtual nsIFrame* GetAbsoluteContainingBlock(nsIFrame* aFrame);
#ifdef MOZ_REFLOW_PERF
virtual void DumpReflows() = 0;
virtual void CountReflows(const char * aName, nsIFrame * aFrame) = 0;
virtual void PaintCount(const char * aName,
nsRenderingContext* aRenderingContext,
nsPresContext * aPresContext,
nsIFrame * aFrame,
const nsPoint& aOffset,
uint32_t aColor) = 0;
virtual void SetPaintFrameCount(bool aOn) = 0;
virtual bool IsPaintingFrameCounts() = 0;
#endif
#ifdef DEBUG
// Debugging hooks
virtual void ListStyleContexts(nsIFrame *aRootFrame, FILE *out,
int32_t aIndent = 0) = 0;
virtual void ListStyleSheets(FILE *out, int32_t aIndent = 0) = 0;
virtual void VerifyStyleTree() = 0;
#endif
#ifdef ACCESSIBILITY
/**
* Return true if accessibility is active.
*/
static bool IsAccessibilityActive();
/**
* Return accessibility service if accessibility is active.
*/
static nsAccessibilityService* AccService();
#endif
/**
* Stop all active elements (plugins and the caret) in this presentation and
* in the presentations of subdocuments. Resets painting to a suppressed state.
* XXX this should include image animations
*/
virtual void Freeze() = 0;
bool IsFrozen() { return mFrozen; }
/**
* Restarts active elements (plugins) in this presentation and in the
* presentations of subdocuments, then do a full invalidate of the content area.
*/
virtual void Thaw() = 0;
virtual void FireOrClearDelayedEvents(bool aFireEvents) = 0;
/**
* When this shell is disconnected from its containing docshell, we
* lose our container pointer. However, we'd still like to be able to target
* user events at the docshell's parent. This pointer allows us to do that.
* It should not be used for any other purpose.
*/
void SetForwardingContainer(const mozilla::WeakPtr<nsDocShell> &aContainer);
/**
* Render the document into an arbitrary gfxContext
* Designed for getting a picture of a document or a piece of a document
* Note that callers will generally want to call FlushPendingNotifications
* to get an up-to-date view of the document
* @param aRect is the region to capture into the offscreen buffer, in the
* root frame's coordinate system (if aIgnoreViewportScrolling is false)
* or in the root scrolled frame's coordinate system
* (if aIgnoreViewportScrolling is true). The coordinates are in appunits.
* @param aFlags see below;
* set RENDER_IS_UNTRUSTED if the contents may be passed to malicious
* agents. E.g. we might choose not to paint the contents of sensitive widgets
* such as the file name in a file upload widget, and we might choose not
* to paint themes.
* set RENDER_IGNORE_VIEWPORT_SCROLLING to ignore
* clipping and scrollbar painting due to scrolling in the viewport
* set RENDER_CARET to draw the caret if one would be visible
* (by default the caret is never drawn)
* set RENDER_USE_LAYER_MANAGER to force rendering to go through
* the layer manager for the window. This may be unexpectedly slow
* (if the layer manager must read back data from the GPU) or low-quality
* (if the layer manager reads back pixel data and scales it
* instead of rendering using the appropriate scaling). It may also
* slow everything down if the area rendered does not correspond to the
* normal visible area of the window.
* set RENDER_ASYNC_DECODE_IMAGES to avoid having images synchronously
* decoded during rendering.
* (by default images decode synchronously with RenderDocument)
* set RENDER_DOCUMENT_RELATIVE to render the document as if there has been
* no scrolling and interpret |aRect| relative to the document instead of the
* CSS viewport. Only considered if RENDER_IGNORE_VIEWPORT_SCROLLING is set
* or the document is in ignore viewport scrolling mode
* (nsIPresShell::SetIgnoreViewportScrolling/IgnoringViewportScrolling).
* @param aBackgroundColor a background color to render onto
* @param aRenderedContext the gfxContext to render to. We render so that
* one CSS pixel in the source document is rendered to one unit in the current
* transform.
*/
enum {
RENDER_IS_UNTRUSTED = 0x01,
RENDER_IGNORE_VIEWPORT_SCROLLING = 0x02,
RENDER_CARET = 0x04,
RENDER_USE_WIDGET_LAYERS = 0x08,
RENDER_ASYNC_DECODE_IMAGES = 0x10,
RENDER_DOCUMENT_RELATIVE = 0x20,
RENDER_DRAWWINDOW_NOT_FLUSHING = 0x40
};
virtual nsresult RenderDocument(const nsRect& aRect, uint32_t aFlags,
nscolor aBackgroundColor,
gfxContext* aRenderedContext) = 0;
enum {
RENDER_AUTO_SCALE = 0x80
};
/**
* Renders a node aNode to a surface and returns it. The aRegion may be used
* to clip the rendering. This region is measured in CSS pixels from the
* edge of the presshell area. The aPoint, aScreenRect and aFlags arguments
* function in a similar manner as RenderSelection.
*/
virtual already_AddRefed<mozilla::gfx::SourceSurface>
RenderNode(nsIDOMNode* aNode,
nsIntRegion* aRegion,
nsIntPoint& aPoint,
nsIntRect* aScreenRect,
uint32_t aFlags) = 0;
/**
* Renders a selection to a surface and returns it. This method is primarily
* intended to create the drag feedback when dragging a selection.
*
* aScreenRect will be filled in with the bounding rectangle of the
* selection area on screen.
*
* If the area of the selection is large and the RENDER_AUTO_SCALE flag is
* set, the image will be scaled down. The argument aPoint is used in this
* case as a reference point when determining the new screen rectangle after
* scaling. Typically, this will be the mouse position, so that the screen
* rectangle is positioned such that the mouse is over the same point in the
* scaled image as in the original. When scaling does not occur, the mouse
* point isn't used because the position can be determined from the displayed
* frames.
*/
virtual already_AddRefed<mozilla::gfx::SourceSurface>
RenderSelection(nsISelection* aSelection,
nsIntPoint& aPoint,
nsIntRect* aScreenRect,
uint32_t aFlags) = 0;
void AddWeakFrameInternal(nsWeakFrame* aWeakFrame);
virtual void AddWeakFrameExternal(nsWeakFrame* aWeakFrame);
void AddWeakFrame(nsWeakFrame* aWeakFrame)
{
#ifdef MOZILLA_INTERNAL_API
AddWeakFrameInternal(aWeakFrame);
#else
AddWeakFrameExternal(aWeakFrame);
#endif
}
void RemoveWeakFrameInternal(nsWeakFrame* aWeakFrame);
virtual void RemoveWeakFrameExternal(nsWeakFrame* aWeakFrame);
void RemoveWeakFrame(nsWeakFrame* aWeakFrame)
{
#ifdef MOZILLA_INTERNAL_API
RemoveWeakFrameInternal(aWeakFrame);
#else
RemoveWeakFrameExternal(aWeakFrame);
#endif
}
#ifdef DEBUG
nsIFrame* GetDrawEventTargetFrame() { return mDrawEventTargetFrame; }
#endif
/**
* Stop or restart non synthetic test mouse event handling on *all*
* presShells.
*
* @param aDisable If true, disable all non synthetic test mouse
* events on all presShells. Otherwise, enable them.
*/
virtual void DisableNonTestMouseEvents(bool aDisable) = 0;
/**
* Record the background color of the most recently drawn canvas. This color
* is composited on top of the user's default background color and then used
* to draw the background color of the canvas. See PresShell::Paint,
* PresShell::PaintDefaultBackground, and nsDocShell::SetupNewViewer;
* bug 488242, bug 476557 and other bugs mentioned there.
*/
void SetCanvasBackground(nscolor aColor) { mCanvasBackgroundColor = aColor; }
nscolor GetCanvasBackground() { return mCanvasBackgroundColor; }
/**
* Use the current frame tree (if it exists) to update the background
* color of the most recently drawn canvas.
*/
virtual void UpdateCanvasBackground() = 0;
/**
* Add a solid color item to the bottom of aList with frame aFrame and bounds
* aBounds. Checks first if this needs to be done by checking if aFrame is a
* canvas frame (if the FORCE_DRAW flag is passed then this check is skipped).
* aBackstopColor is composed behind the background color of the canvas, it is
* transparent by default.
*/
enum {
FORCE_DRAW = 0x01
};
virtual void AddCanvasBackgroundColorItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds,
nscolor aBackstopColor = NS_RGBA(0,0,0,0),
uint32_t aFlags = 0) = 0;
/**
* Add a solid color item to the bottom of aList with frame aFrame and
* bounds aBounds representing the dark grey background behind the page of a
* print preview presentation.
*/
virtual void AddPrintPreviewBackgroundItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds) = 0;
/**
* Computes the backstop color for the view: transparent if in a transparent
* widget, otherwise the PresContext default background color. This color is
* only visible if the contents of the view as a whole are translucent.
*/
virtual nscolor ComputeBackstopColor(nsView* aDisplayRoot) = 0;
void ObserveNativeAnonMutationsForPrint(bool aObserve)
{
mObservesMutationsForPrint = aObserve;
}
bool ObservesNativeAnonMutationsForPrint()
{
return mObservesMutationsForPrint;
}
virtual nsresult SetIsActive(bool aIsActive, bool aIsHidden = true) = 0;
bool IsActive()
{
return mIsActive;
}
// mouse capturing
static CapturingContentInfo gCaptureInfo;
struct PointerCaptureInfo
{
nsCOMPtr<nsIContent> mPendingContent;
nsCOMPtr<nsIContent> mOverrideContent;
bool mReleaseContent;
bool mPrimaryState;
explicit PointerCaptureInfo(nsIContent* aPendingContent, bool aPrimaryState) :
mPendingContent(aPendingContent), mReleaseContent(false), mPrimaryState(aPrimaryState)
{
MOZ_COUNT_CTOR(PointerCaptureInfo);
}
~PointerCaptureInfo()
{
MOZ_COUNT_DTOR(PointerCaptureInfo);
}
bool Empty()
{
return !(mPendingContent || mOverrideContent);
}
};
// Keeps a map between pointerId and element that currently capturing pointer
// with such pointerId. If pointerId is absent in this map then nobody is
// capturing it. Additionally keep information about pending capturing content.
// Additionally keep information about primaryState of pointer event.
static nsClassHashtable<nsUint32HashKey, PointerCaptureInfo>* gPointerCaptureList;
struct PointerInfo
{
bool mActiveState;
uint16_t mPointerType;
bool mPrimaryState;
PointerInfo(bool aActiveState, uint16_t aPointerType, bool aPrimaryState) :
mActiveState(aActiveState), mPointerType(aPointerType), mPrimaryState(aPrimaryState) {}
};
// Keeps information about pointers such as pointerId, activeState, pointerType, primaryState
static nsClassHashtable<nsUint32HashKey, PointerInfo>* gActivePointersIds;
static void DispatchGotOrLostPointerCaptureEvent(bool aIsGotCapture,
uint32_t aPointerId,
uint16_t aPointerType,
bool aIsPrimary,
nsIContent* aCaptureTarget);
static void SetPointerCapturingContent(uint32_t aPointerId, nsIContent* aContent);
static void ReleasePointerCapturingContent(uint32_t aPointerId);
static nsIContent* GetPointerCapturingContent(uint32_t aPointerId);
// CheckPointerCaptureState checks cases, when got/lostpointercapture events should be fired.
// Function returns true, if any of events was fired; false, if no one event was fired.
static bool CheckPointerCaptureState(uint32_t aPointerId);
// GetPointerInfo returns true if pointer with aPointerId is situated in device, false otherwise.
// aActiveState is additional information, which shows state of pointer like button state for mouse.
static bool GetPointerInfo(uint32_t aPointerId, bool& aActiveState);
// GetPointerType returns pointer type like mouse, pen or touch for pointer event with pointerId
static uint16_t GetPointerType(uint32_t aPointerId);
// GetPointerPrimaryState returns state of attribute isPrimary for pointer event with pointerId
static bool GetPointerPrimaryState(uint32_t aPointerId);
/**
* When capturing content is set, it traps all mouse events and retargets
* them at this content node. If capturing is not allowed
* (gCaptureInfo.mAllowed is false), then capturing is not set. However, if
* the CAPTURE_IGNOREALLOWED flag is set, the allowed state is ignored and
* capturing is set regardless. To disable capture, pass null for the value
* of aContent.
*
* If CAPTURE_RETARGETTOELEMENT is set, all mouse events are targeted at
* aContent only. Otherwise, mouse events are targeted at aContent or its
* descendants. That is, descendants of aContent receive mouse events as
* they normally would, but mouse events outside of aContent are retargeted
* to aContent.
*
* If CAPTURE_PREVENTDRAG is set then drags are prevented from starting while
* this capture is active.
*
* If CAPTURE_POINTERLOCK is set, similar to CAPTURE_RETARGETTOELEMENT, then
* events are targeted at aContent, but capturing is held more strongly (i.e.,
* calls to SetCapturingContent won't unlock unless CAPTURE_POINTERLOCK is
* set again).
*/
static void SetCapturingContent(nsIContent* aContent, uint8_t aFlags);
/**
* Return the active content currently capturing the mouse if any.
*/
static nsIContent* GetCapturingContent()
{
return gCaptureInfo.mContent;
}
/**
* Allow or disallow mouse capturing.
*/
static void AllowMouseCapture(bool aAllowed)
{
gCaptureInfo.mAllowed = aAllowed;
}
/**
* Returns true if there is an active mouse capture that wants to prevent
* drags.
*/
static bool IsMouseCapturePreventingDrag()
{
return gCaptureInfo.mPreventDrag && gCaptureInfo.mContent;
}
/**
* Keep track of how many times this presshell has been rendered to
* a window.
*/
uint64_t GetPaintCount() { return mPaintCount; }
void IncrementPaintCount() { ++mPaintCount; }
/**
* Get the root DOM window of this presShell.
*/
virtual already_AddRefed<nsPIDOMWindowOuter> GetRootWindow() = 0;
/**
* Get the layer manager for the widget of the root view, if it has
* one.
*/
virtual LayerManager* GetLayerManager() = 0;
/**
* Return true iff there is a widget rendering this presShell and that
* widget is APZ-enabled.
*/
virtual bool AsyncPanZoomEnabled() = 0;
/**
* Track whether we're ignoring viewport scrolling for the purposes
* of painting. If we are ignoring, then layers aren't clipped to
* the CSS viewport and scrollbars aren't drawn.
*/
virtual void SetIgnoreViewportScrolling(bool aIgnore) = 0;
bool IgnoringViewportScrolling() const
{ return mRenderFlags & STATE_IGNORING_VIEWPORT_SCROLLING; }
/**
* Set a "resolution" for the document, which if not 1.0 will
* allocate more or fewer pixels for rescalable content by a factor
* of |resolution| in both dimensions. Return NS_OK iff the
* resolution bounds are sane, and the resolution of this was
* actually updated.
*
* The resolution defaults to 1.0.
*/
virtual nsresult SetResolution(float aResolution) = 0;
float GetResolution() const { return mResolution.valueOr(1.0); }
virtual float GetCumulativeResolution() = 0;
/**
* Calculate the cumulative scale resolution from this document up to
* but not including the root document.
*/
virtual float GetCumulativeNonRootScaleResolution() = 0;
/**
* Was the current resolution set by the user or just default initialized?
*/
bool IsResolutionSet() { return mResolution.isSome(); }
/**
* Similar to SetResolution() but also increases the scale of the content
* by the same amount.
*/
virtual nsresult SetResolutionAndScaleTo(float aResolution) = 0;
/**
* Return whether we are scaling to the set resolution.
* This is initially false; it's set to true by a call to
* SetResolutionAndScaleTo(), and set to false by a call to SetResolution().
*/
virtual bool ScaleToResolution() const = 0;
/**
* Returns whether we are in a DrawWindow() call that used the
* DRAWWINDOW_DO_NOT_FLUSH flag.
*/
bool InDrawWindowNotFlushing() const
{ return mRenderFlags & STATE_DRAWWINDOW_NOT_FLUSHING; }
/**
* Set the isFirstPaint flag.
*/
void SetIsFirstPaint(bool aIsFirstPaint) { mIsFirstPaint = aIsFirstPaint; }
/**
* Get the isFirstPaint flag.
*/
bool GetIsFirstPaint() const { return mIsFirstPaint; }
uint32_t GetPresShellId() { return mPresShellId; }
/**
* Dispatch a mouse move event based on the most recent mouse position if
* this PresShell is visible. This is used when the contents of the page
* moved (aFromScroll is false) or scrolled (aFromScroll is true).
*/
virtual void SynthesizeMouseMove(bool aFromScroll) = 0;
enum PaintFlags {
/* Update the layer tree and paint PaintedLayers. If this is not specified,
* we may still have to do it if the layer tree lost PaintedLayer contents
* we need for compositing. */
PAINT_LAYERS = 0x01,
/* Composite layers to the window. */
PAINT_COMPOSITE = 0x02,
/* Sync-decode images. */
PAINT_SYNC_DECODE_IMAGES = 0x04
};
virtual void Paint(nsView* aViewToPaint, const nsRegion& aDirtyRegion,
uint32_t aFlags) = 0;
virtual nsresult HandleEvent(nsIFrame* aFrame,
mozilla::WidgetGUIEvent* aEvent,
bool aDontRetargetEvents,
nsEventStatus* aEventStatus,
nsIContent** aTargetContent = nullptr) = 0;
virtual bool ShouldIgnoreInvalidation() = 0;
/**
* Notify that we're going to call Paint with PAINT_LAYERS
* on the pres shell for a widget (which might not be this one, since
* WillPaint is called on all presshells in the same toplevel window as the
* painted widget). This is issued at a time when it's safe to modify
* widget geometry.
*/
virtual void WillPaint() = 0;
/**
* Notify that we're going to call Paint with PAINT_COMPOSITE.
* Fires on the presshell for the painted widget.
* This is issued at a time when it's safe to modify widget geometry.
*/
virtual void WillPaintWindow() = 0;
/**
* Notify that we called Paint with PAINT_COMPOSITE.
* Fires on the presshell for the painted widget.
* This is issued at a time when it's safe to modify widget geometry.
*/
virtual void DidPaintWindow() = 0;
/**
* Ensures that the refresh driver is running, and schedules a view
* manager flush on the next tick.
*
* @param aType PAINT_DELAYED_COMPRESS : Schedule a paint to be executed after a delay, and
* put FrameLayerBuilder in 'compressed' mode that avoids short cut optimizations.
*/
enum PaintType {
PAINT_DEFAULT,
PAINT_DELAYED_COMPRESS
};
virtual void ScheduleViewManagerFlush(PaintType aType = PAINT_DEFAULT) = 0;
virtual void ClearMouseCaptureOnView(nsView* aView) = 0;
virtual bool IsVisible() = 0;
virtual void DispatchSynthMouseMove(mozilla::WidgetGUIEvent* aEvent,
bool aFlushOnHoverChange) = 0;
virtual void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
nsArenaMemoryStats *aArenaObjectsSize,
size_t *aPresShellSize,
size_t *aStyleSetsSize,
size_t *aTextRunsSize,
size_t *aPresContextSize) = 0;
/**
* Methods that retrieve the cached font inflation preferences.
*/
uint32_t FontSizeInflationEmPerLine() const {
return mFontSizeInflationEmPerLine;
}
uint32_t FontSizeInflationMinTwips() const {
return mFontSizeInflationMinTwips;
}
uint32_t FontSizeInflationLineThreshold() const {
return mFontSizeInflationLineThreshold;
}
bool FontSizeInflationForceEnabled() const {
return mFontSizeInflationForceEnabled;
}
bool FontSizeInflationDisabledInMasterProcess() const {
return mFontSizeInflationDisabledInMasterProcess;
}
/**
* Determine if font size inflation is enabled. This value is cached until
* it becomes dirty.
*
* @returns true, if font size inflation is enabled; false otherwise.
*/
bool FontSizeInflationEnabled();
/**
* Notify the pres shell that an event occurred making the current value of
* mFontSizeInflationEnabled invalid. This will schedule a recomputation of
* whether font size inflation is enabled on the next call to
* FontSizeInflationEnabled().
*/
void NotifyFontSizeInflationEnabledIsDirty()
{
mFontSizeInflationEnabledIsDirty = true;
}
virtual void AddInvalidateHiddenPresShellObserver(nsRefreshDriver *aDriver) = 0;
void InvalidatePresShellIfHidden();
void CancelInvalidatePresShellIfHidden();
//////////////////////////////////////////////////////////////////////////////
// Approximate frame visibility tracking public API.
//////////////////////////////////////////////////////////////////////////////
/// Schedule an update of the list of approximately visible frames "soon".
/// This lets the refresh driver know that we want a visibility update in the
/// near future. The refresh driver applies its own heuristics and throttling
/// to decide when to actually perform the visibility update.
virtual void ScheduleApproximateFrameVisibilityUpdateSoon() = 0;
/// Schedule an update of the list of approximately visible frames "now". The
/// update runs asynchronously, but it will be posted to the event loop
/// immediately. Prefer the "soon" variation of this method when possible, as
/// this variation ignores the refresh driver's heuristics.
virtual void ScheduleApproximateFrameVisibilityUpdateNow() = 0;
/// Clears the current list of approximately visible frames on this pres shell
/// and replaces it with frames that are in the display list @aList.
virtual void RebuildApproximateFrameVisibilityDisplayList(const nsDisplayList& aList) = 0;
virtual void RebuildApproximateFrameVisibility(nsRect* aRect = nullptr,
bool aRemoveOnly = false) = 0;
/// Adds @aFrame to the list of frames which were visible within the
/// displayport during the last paint.
virtual void MarkFrameVisibleInDisplayPort(nsIFrame* aFrame) = 0;
/// Marks @aFrame nonvisible and removes it from all lists of visible frames.
virtual void MarkFrameNonvisible(nsIFrame* aFrame) = 0;
/// Whether we should assume all frames are visible.
virtual bool AssumeAllFramesVisible() = 0;
/**
* Returns whether the document's style set's rule processor for the
* specified level of the cascade is shared by multiple style sets.
*
* @param aSheetType One of the nsIStyleSheetService.*_SHEET constants.
*/
nsresult HasRuleProcessorUsedByMultipleStyleSets(uint32_t aSheetType,
bool* aRetVal);
bool IsInFullscreenChange() const { return mIsInFullscreenChange; }
void SetIsInFullscreenChange(bool aValue);
/**
* Refresh observer management.
*/
protected:
virtual bool AddRefreshObserverExternal(nsARefreshObserver* aObserver,
mozFlushType aFlushType);
bool AddRefreshObserverInternal(nsARefreshObserver* aObserver,
mozFlushType aFlushType);
virtual bool RemoveRefreshObserverExternal(nsARefreshObserver* aObserver,
mozFlushType aFlushType);
bool RemoveRefreshObserverInternal(nsARefreshObserver* aObserver,
mozFlushType aFlushType);
/**
* Do computations necessary to determine if font size inflation is enabled.
* This value is cached after computation, as the computation is somewhat
* expensive.
*/
void RecomputeFontSizeInflationEnabled();
public:
bool AddRefreshObserver(nsARefreshObserver* aObserver,
mozFlushType aFlushType) {
#ifdef MOZILLA_INTERNAL_API
return AddRefreshObserverInternal(aObserver, aFlushType);
#else
return AddRefreshObserverExternal(aObserver, aFlushType);
#endif
}
bool RemoveRefreshObserver(nsARefreshObserver* aObserver,
mozFlushType aFlushType) {
#ifdef MOZILLA_INTERNAL_API
return RemoveRefreshObserverInternal(aObserver, aFlushType);
#else
return RemoveRefreshObserverExternal(aObserver, aFlushType);
#endif
}
virtual bool AddPostRefreshObserver(nsAPostRefreshObserver* aObserver);
virtual bool RemovePostRefreshObserver(nsAPostRefreshObserver* aObserver);
/**
* Initialize and shut down static variables.
*/
static void InitializeStatics();
static void ReleaseStatics();
// If a frame in the subtree rooted at aFrame is capturing the mouse then
// clears that capture.
static void ClearMouseCapture(nsIFrame* aFrame);
void SetScrollPositionClampingScrollPortSize(nscoord aWidth, nscoord aHeight);
bool IsScrollPositionClampingScrollPortSizeSet() {
return mScrollPositionClampingScrollPortSizeSet;
}
nsSize GetScrollPositionClampingScrollPortSize() {
NS_ASSERTION(mScrollPositionClampingScrollPortSizeSet, "asking for scroll port when its not set?");
return mScrollPositionClampingScrollPortSize;
}
virtual void WindowSizeMoveDone() = 0;
virtual void SysColorChanged() = 0;
virtual void ThemeChanged() = 0;
virtual void BackingScaleFactorChanged() = 0;
/**
* Documents belonging to an invisible DocShell must not be painted ever.
*/
bool IsNeverPainting() {
return mIsNeverPainting;
}
void SetNeverPainting(bool aNeverPainting) {
mIsNeverPainting = aNeverPainting;
}
bool HasPendingReflow() const
{ return mReflowScheduled || mReflowContinueTimer; }
void SyncWindowProperties(nsView* aView);
#ifdef ANDROID
virtual nsIDocument* GetTouchEventTargetDocument() = 0;
#endif
protected:
friend class nsRefreshDriver;
// IMPORTANT: The ownership implicit in the following member variables
// has been explicitly checked. If you add any members to this class,
// please make the ownership explicit (pinkerton, scc).
// These are the same Document and PresContext owned by the DocViewer.
// we must share ownership.
nsCOMPtr<nsIDocument> mDocument;
RefPtr<nsPresContext> mPresContext;
mozilla::StyleSetHandle mStyleSet; // [OWNS]
nsCSSFrameConstructor* mFrameConstructor; // [OWNS]
nsViewManager* mViewManager; // [WEAK] docViewer owns it so I don't have to
nsPresArena mFrameArena;
RefPtr<nsFrameSelection> mSelection;
// Pointer into mFrameConstructor - this is purely so that FrameManager() and
// GetRootFrame() can be inlined:
nsFrameManagerBase* mFrameManager;
mozilla::WeakPtr<nsDocShell> mForwardingContainer;
nsRefreshDriver* MOZ_UNSAFE_REF("These two objects hold weak references "
"to each other, and the validity of this "
"member is ensured by the logic in nsIPresShell.")
mHiddenInvalidationObserverRefreshDriver;
#ifdef ACCESSIBILITY
mozilla::a11y::DocAccessible* mDocAccessible;
#endif
// At least on Win32 and Mac after interupting a reflow we need to post
// the resume reflow event off a timer to avoid event starvation because
// posted messages are processed before other messages when the modal
// moving/sizing loop is running, see bug 491700 for details.
nsCOMPtr<nsITimer> mReflowContinueTimer;
#ifdef MOZ_B2G
// Forward hardware key events to the input-method-app
nsCOMPtr<nsIHardwareKeyHandler> mHardwareKeyHandler;
#endif // MOZ_B2G
#ifdef DEBUG
nsIFrame* mDrawEventTargetFrame;
// Ensure that every allocation from the PresArena is eventually freed.
uint32_t mPresArenaAllocCount;
#endif
// Count of the number of times this presshell has been painted to a window.
uint64_t mPaintCount;
nsSize mScrollPositionClampingScrollPortSize;
// A list of weak frames. This is a pointer to the last item in the list.
nsWeakFrame* mWeakFrames;
// Most recent canvas background color.
nscolor mCanvasBackgroundColor;
// Used to force allocation and rendering of proportionally more or
// less pixels in both dimensions.
mozilla::Maybe<float> mResolution;
int16_t mSelectionFlags;
// Flags controlling how our document is rendered. These persist
// between paints and so are tied with retained layer pixels.
// PresShell flushes retained layers when the rendering state
// changes in a way that prevents us from being able to (usefully)
// re-use old pixels.
RenderFlags mRenderFlags;
// Indicates that the whole document must be restyled. Changes to scoped
// style sheets are recorded in mChangedScopeStyleRoots rather than here
// in mStylesHaveChanged.
bool mStylesHaveChanged : 1;
bool mDidInitialize : 1;
bool mIsDestroying : 1;
bool mIsZombie : 1;
bool mIsReflowing : 1;
// Indicates that the whole document is performing fullscreen change,
// in which case, we need to defer dispatching resize event and freeze
// the refresh driver to avoid unnecessary reflow.
bool mIsInFullscreenChange : 1;
// For all documents we initially lock down painting.
bool mPaintingSuppressed : 1;
// Whether or not form controls should use nsITheme in this shell.
bool mIsThemeSupportDisabled : 1;
bool mIsActive : 1;
bool mFrozen : 1;
bool mIsFirstPaint : 1;
bool mObservesMutationsForPrint : 1;
// If true, we have a reflow scheduled. Guaranteed to be false if
// mReflowContinueTimer is non-null.
bool mReflowScheduled : 1;
bool mSuppressInterruptibleReflows : 1;
bool mScrollPositionClampingScrollPortSizeSet : 1;
uint32_t mPresShellId;
// List of subtrees rooted at style scope roots that need to be restyled.
// When a change to a scoped style sheet is made, we add the style scope
// root to this array rather than setting mStylesHaveChanged = true, since
// we know we don't need to restyle the whole document. However, if in the
// same update block we have already had other changes that require
// the whole document to be restyled (i.e., mStylesHaveChanged is already
// true), then we don't bother adding the scope root here.
AutoTArray<RefPtr<mozilla::dom::Element>,1> mChangedScopeStyleRoots;
static nsIContent* gKeyDownTarget;
// Cached font inflation values. This is done to prevent changing of font
// inflation until a page is reloaded.
uint32_t mFontSizeInflationEmPerLine;
uint32_t mFontSizeInflationMinTwips;
uint32_t mFontSizeInflationLineThreshold;
bool mFontSizeInflationForceEnabled;
bool mFontSizeInflationDisabledInMasterProcess;
bool mFontSizeInflationEnabled;
bool mPaintingIsFrozen;
// Dirty bit indicating that mFontSizeInflationEnabled needs to be recomputed.
bool mFontSizeInflationEnabledIsDirty;
// If a document belongs to an invisible DocShell, this flag must be set
// to true, so we can avoid any paint calls for widget related to this
// presshell.
bool mIsNeverPainting;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIPresShell, NS_IPRESSHELL_IID)
#endif /* nsIPresShell_h___ */
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