mozilla
/
gecko-dev
зеркало из https://github.com/mozilla/gecko-dev.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
gecko-dev/widget/TextEvents.h

1015 строки
31 KiB
C++
Исходник Ответственный История

/* -*- 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/. */
#ifndef mozilla_TextEvents_h__
#define mozilla_TextEvents_h__
#include <stdint.h>
#include "mozilla/Assertions.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/EventForwards.h" // for KeyNameIndex, temporarily
#include "mozilla/TextRange.h"
#include "mozilla/FontRange.h"
#include "nsCOMPtr.h"
#include "nsIDOMKeyEvent.h"
#include "nsISelectionController.h"
#include "nsISelectionListener.h"
#include "nsITransferable.h"
#include "nsRect.h"
#include "nsStringGlue.h"
#include "nsTArray.h"
#include "WritingModes.h"
class nsStringHashKey;
template<class, class> class nsDataHashtable;
/******************************************************************************
* virtual keycode values
******************************************************************************/
enum
{
#define NS_DEFINE_VK(aDOMKeyName, aDOMKeyCode) NS_##aDOMKeyName = aDOMKeyCode,
#include "mozilla/VirtualKeyCodeList.h"
#undef NS_DEFINE_VK
NS_VK_UNKNOWN = 0xFF
};
namespace mozilla {
const nsCString GetDOMKeyCodeName(uint32_t aKeyCode);
namespace dom {
class PBrowserParent;
class PBrowserChild;
} // namespace dom
namespace plugins {
class PPluginInstanceChild;
} // namespace plugins
/******************************************************************************
* mozilla::AlternativeCharCode
*
* This stores alternative charCode values of a key event with some modifiers.
* The stored values proper for testing shortcut key or access key.
******************************************************************************/
struct AlternativeCharCode
{
AlternativeCharCode() :
mUnshiftedCharCode(0), mShiftedCharCode(0)
{
}
AlternativeCharCode(uint32_t aUnshiftedCharCode, uint32_t aShiftedCharCode) :
mUnshiftedCharCode(aUnshiftedCharCode), mShiftedCharCode(aShiftedCharCode)
{
}
uint32_t mUnshiftedCharCode;
uint32_t mShiftedCharCode;
};
/******************************************************************************
* mozilla::ShortcutKeyCandidate
*
* This stores a candidate of shortcut key combination.
******************************************************************************/
struct ShortcutKeyCandidate
{
ShortcutKeyCandidate(uint32_t aCharCode, bool aIgnoreShift)
: mCharCode(aCharCode)
, mIgnoreShift(aIgnoreShift)
{
}
// The mCharCode value which must match keyboard shortcut definition.
uint32_t mCharCode;
// true if Shift state can be ignored. Otherwise, Shift key state must
// match keyboard shortcut definition.
bool mIgnoreShift;
};
/******************************************************************************
* mozilla::WidgetKeyboardEvent
******************************************************************************/
class WidgetKeyboardEvent : public WidgetInputEvent
{
private:
friend class dom::PBrowserParent;
friend class dom::PBrowserChild;
protected:
WidgetKeyboardEvent()
: mNativeKeyEvent(nullptr)
, mKeyCode(0)
, mCharCode(0)
, mPseudoCharCode(0)
, mLocation(nsIDOMKeyEvent::DOM_KEY_LOCATION_STANDARD)
, mAccessKeyForwardedToChild(false)
, mUniqueId(0)
#ifdef XP_MACOSX
, mNativeModifierFlags(0)
, mNativeKeyCode(0)
#endif // #ifdef XP_MACOSX
, mKeyNameIndex(mozilla::KEY_NAME_INDEX_Unidentified)
, mCodeNameIndex(CODE_NAME_INDEX_UNKNOWN)
, mInputMethodAppState(eNotHandled)
, mIsChar(false)
, mIsRepeat(false)
, mIsComposing(false)
, mIsReserved(false)
, mIsSynthesizedByTIP(false)
{
}
public:
virtual WidgetKeyboardEvent* AsKeyboardEvent() override { return this; }
WidgetKeyboardEvent(bool aIsTrusted, EventMessage aMessage,
nsIWidget* aWidget,
EventClassID aEventClassID = eKeyboardEventClass)
: WidgetInputEvent(aIsTrusted, aMessage, aWidget, aEventClassID)
, mNativeKeyEvent(nullptr)
, mKeyCode(0)
, mCharCode(0)
, mPseudoCharCode(0)
, mLocation(nsIDOMKeyEvent::DOM_KEY_LOCATION_STANDARD)
, mAccessKeyForwardedToChild(false)
, mUniqueId(0)
#ifdef XP_MACOSX
, mNativeModifierFlags(0)
, mNativeKeyCode(0)
#endif // #ifdef XP_MACOSX
, mKeyNameIndex(mozilla::KEY_NAME_INDEX_Unidentified)
, mCodeNameIndex(CODE_NAME_INDEX_UNKNOWN)
, mInputMethodAppState(eNotHandled)
, mIsChar(false)
, mIsRepeat(false)
, mIsComposing(false)
, mIsReserved(false)
, mIsSynthesizedByTIP(false)
{
// If this is a keyboard event on a plugin, it shouldn't fired on content.
mFlags.mOnlySystemGroupDispatchInContent =
mFlags.mNoCrossProcessBoundaryForwarding = IsKeyEventOnPlugin();
}
static bool IsKeyDownOrKeyDownOnPlugin(EventMessage aMessage)
{
return aMessage == eKeyDown || aMessage == eKeyDownOnPlugin;
}
bool IsKeyDownOrKeyDownOnPlugin() const
{
return IsKeyDownOrKeyDownOnPlugin(mMessage);
}
static bool IsKeyUpOrKeyUpOnPlugin(EventMessage aMessage)
{
return aMessage == eKeyUp || aMessage == eKeyUpOnPlugin;
}
bool IsKeyUpOrKeyUpOnPlugin() const
{
return IsKeyUpOrKeyUpOnPlugin(mMessage);
}
static bool IsKeyEventOnPlugin(EventMessage aMessage)
{
return aMessage == eKeyDownOnPlugin || aMessage == eKeyUpOnPlugin;
}
bool IsKeyEventOnPlugin() const
{
return IsKeyEventOnPlugin(mMessage);
}
virtual WidgetEvent* Duplicate() const override
{
MOZ_ASSERT(mClass == eKeyboardEventClass,
"Duplicate() must be overridden by sub class");
// Not copying widget, it is a weak reference.
WidgetKeyboardEvent* result =
new WidgetKeyboardEvent(false, mMessage, nullptr);
result->AssignKeyEventData(*this, true);
result->mFlags = mFlags;
return result;
}
// OS translated Unicode chars which are used for accesskey and accelkey
// handling. The handlers will try from first character to last character.
nsTArray<AlternativeCharCode> mAlternativeCharCodes;
// DOM KeyboardEvent.key only when mKeyNameIndex is KEY_NAME_INDEX_USE_STRING.
nsString mKeyValue;
// DOM KeyboardEvent.code only when mCodeNameIndex is
// CODE_NAME_INDEX_USE_STRING.
nsString mCodeValue;
#ifdef XP_MACOSX
// Values given by a native NSEvent, for use with Cocoa NPAPI plugins.
nsString mNativeCharacters;
nsString mNativeCharactersIgnoringModifiers;
// If this is non-empty, create a text event for plugins instead of a
// keyboard event.
nsString mPluginTextEventString;
#endif // #ifdef XP_MACOSX
// OS-specific native event can optionally be preserved
void* mNativeKeyEvent;
// A DOM keyCode value or 0. If a keypress event whose mCharCode is 0, this
// should be 0.
uint32_t mKeyCode;
// If the instance is a keypress event of a printable key, this is a UTF-16
// value of the key. Otherwise, 0. This value must not be a control
// character when some modifiers are active. Then, this value should be an
// unmodified value except Shift and AltGr.
uint32_t mCharCode;
// mPseudoCharCode is valid only when mMessage is an eKeyDown event.
// This stores mCharCode value of keypress event which is fired with same
// key value and same modifier state.
uint32_t mPseudoCharCode;
// One of nsIDOMKeyEvent::DOM_KEY_LOCATION_*
uint32_t mLocation;
// True if accesskey handling was forwarded to the child via
// TabParent::HandleAccessKey. In this case, parent process menu access key
// handling should be delayed until it is determined that there exists no
// overriding access key in the content process.
bool mAccessKeyForwardedToChild;
// Unique id associated with a keydown / keypress event. Used in identifing
// keypress events for removal from async event dispatch queue in metrofx
// after preventDefault is called on keydown events. It's ok if this wraps
// over long periods.
uint32_t mUniqueId;
#ifdef XP_MACOSX
// Values given by a native NSEvent, for use with Cocoa NPAPI plugins.
uint32_t mNativeModifierFlags;
uint16_t mNativeKeyCode;
#endif // #ifdef XP_MACOSX
// DOM KeyboardEvent.key
KeyNameIndex mKeyNameIndex;
// DOM KeyboardEvent.code
CodeNameIndex mCodeNameIndex;
// Indicates that the event is being handled by input method app
typedef uint8_t InputMethodAppStateType;
enum InputMethodAppState : InputMethodAppStateType
{
eNotHandled, // not yet handled by intput method app
eHandling, // being handled by intput method app
eHandled // handled by input method app
};
InputMethodAppState mInputMethodAppState;
// Indicates whether the event signifies a printable character
bool mIsChar;
// Indicates whether the event is generated by auto repeat or not.
// if this is keyup event, always false.
bool mIsRepeat;
// Indicates whether the event is generated during IME (or deadkey)
// composition. This is initialized by EventStateManager. So, key event
// dispatchers don't need to initialize this.
bool mIsComposing;
// Indicates if the key combination is reserved by chrome. This is set by
// nsXBLWindowKeyHandler at capturing phase of the default event group.
bool mIsReserved;
// Indicates whether the event is synthesized from Text Input Processor
// or an actual event from nsAppShell.
bool mIsSynthesizedByTIP;
// If the key should cause keypress events, this returns true.
// Otherwise, false.
bool ShouldCauseKeypressEvents() const;
// mCharCode value of non-eKeyPress events is always 0. However, if
// non-eKeyPress event has one or more alternative char code values,
// its first item should be the mCharCode value of following eKeyPress event.
// PseudoCharCode() returns mCharCode value for eKeyPress event,
// the first alternative char code value of non-eKeyPress event or 0.
uint32_t PseudoCharCode() const
{
return mMessage == eKeyPress ? mCharCode : mPseudoCharCode;
}
void SetCharCode(uint32_t aCharCode)
{
if (mMessage == eKeyPress) {
mCharCode = aCharCode;
} else {
mPseudoCharCode = aCharCode;
}
}
void GetDOMKeyName(nsAString& aKeyName)
{
if (mKeyNameIndex == KEY_NAME_INDEX_USE_STRING) {
aKeyName = mKeyValue;
return;
}
GetDOMKeyName(mKeyNameIndex, aKeyName);
}
void GetDOMCodeName(nsAString& aCodeName)
{
if (mCodeNameIndex == CODE_NAME_INDEX_USE_STRING) {
aCodeName = mCodeValue;
return;
}
GetDOMCodeName(mCodeNameIndex, aCodeName);
}
bool IsModifierKeyEvent() const
{
return GetModifierForKeyName(mKeyNameIndex) != MODIFIER_NONE;
}
/**
* Get the candidates for shortcut key.
*
* @param aCandidates [out] the candidate shortcut key combination list.
* the first item is most preferred.
*/
void GetShortcutKeyCandidates(ShortcutKeyCandidateArray& aCandidates);
/**
* Get the candidates for access key.
*
* @param aCandidates [out] the candidate access key list.
* the first item is most preferred.
*/
void GetAccessKeyCandidates(nsTArray<uint32_t>& aCandidates);
static void Shutdown();
/**
* ComputeLocationFromCodeValue() returns one of .mLocation value
* (nsIDOMKeyEvent::DOM_KEY_LOCATION_*) which is the most preferred value
* for the specified specified code value.
*/
static uint32_t ComputeLocationFromCodeValue(CodeNameIndex aCodeNameIndex);
/**
* ComputeKeyCodeFromKeyNameIndex() return a .mKeyCode value which can be
* mapped from the specified key value. Note that this returns 0 if the
* key name index is KEY_NAME_INDEX_Unidentified or KEY_NAME_INDEX_USE_STRING.
* This means that this method is useful only for non-printable keys.
*/
static uint32_t ComputeKeyCodeFromKeyNameIndex(KeyNameIndex aKeyNameIndex);
/**
* GetModifierForKeyName() returns a value of Modifier which is activated
* by the aKeyNameIndex.
*/
static Modifier GetModifierForKeyName(KeyNameIndex aKeyNameIndex);
/**
* IsLockableModifier() returns true if aKeyNameIndex is a lockable modifier
* key such as CapsLock and NumLock.
*/
static bool IsLockableModifier(KeyNameIndex aKeyNameIndex);
static void GetDOMKeyName(KeyNameIndex aKeyNameIndex,
nsAString& aKeyName);
static void GetDOMCodeName(CodeNameIndex aCodeNameIndex,
nsAString& aCodeName);
static KeyNameIndex GetKeyNameIndex(const nsAString& aKeyValue);
static CodeNameIndex GetCodeNameIndex(const nsAString& aCodeValue);
static const char* GetCommandStr(Command aCommand);
void AssignKeyEventData(const WidgetKeyboardEvent& aEvent, bool aCopyTargets)
{
AssignInputEventData(aEvent, aCopyTargets);
mKeyCode = aEvent.mKeyCode;
mCharCode = aEvent.mCharCode;
mPseudoCharCode = aEvent.mPseudoCharCode;
mLocation = aEvent.mLocation;
mAlternativeCharCodes = aEvent.mAlternativeCharCodes;
mIsChar = aEvent.mIsChar;
mIsRepeat = aEvent.mIsRepeat;
mIsComposing = aEvent.mIsComposing;
mIsReserved = aEvent.mIsReserved;
mAccessKeyForwardedToChild = aEvent.mAccessKeyForwardedToChild;
mKeyNameIndex = aEvent.mKeyNameIndex;
mCodeNameIndex = aEvent.mCodeNameIndex;
mKeyValue = aEvent.mKeyValue;
mCodeValue = aEvent.mCodeValue;
// Don't copy mNativeKeyEvent because it may be referred after its instance
// is destroyed.
mNativeKeyEvent = nullptr;
mUniqueId = aEvent.mUniqueId;
#ifdef XP_MACOSX
mNativeKeyCode = aEvent.mNativeKeyCode;
mNativeModifierFlags = aEvent.mNativeModifierFlags;
mNativeCharacters.Assign(aEvent.mNativeCharacters);
mNativeCharactersIgnoringModifiers.
Assign(aEvent.mNativeCharactersIgnoringModifiers);
mPluginTextEventString.Assign(aEvent.mPluginTextEventString);
#endif
mInputMethodAppState = aEvent.mInputMethodAppState;
mIsSynthesizedByTIP = aEvent.mIsSynthesizedByTIP;
}
private:
static const char16_t* const kKeyNames[];
static const char16_t* const kCodeNames[];
typedef nsDataHashtable<nsStringHashKey,
KeyNameIndex> KeyNameIndexHashtable;
typedef nsDataHashtable<nsStringHashKey,
CodeNameIndex> CodeNameIndexHashtable;
static KeyNameIndexHashtable* sKeyNameIndexHashtable;
static CodeNameIndexHashtable* sCodeNameIndexHashtable;
};
/******************************************************************************
* mozilla::InternalBeforeAfterKeyboardEvent
*
* This is extended from WidgetKeyboardEvent and is mapped to DOM event
* "BeforeAfterKeyboardEvent".
*
* Event mMessage: eBeforeKeyDown
* eBeforeKeyUp
* eAfterKeyDown
* eAfterKeyUp
******************************************************************************/
class InternalBeforeAfterKeyboardEvent : public WidgetKeyboardEvent
{
private:
friend class dom::PBrowserParent;
friend class dom::PBrowserChild;
InternalBeforeAfterKeyboardEvent()
{
}
public:
// Extra member for InternalBeforeAfterKeyboardEvent. Indicates whether
// default actions of keydown/keyup event is prevented.
Nullable<bool> mEmbeddedCancelled;
virtual InternalBeforeAfterKeyboardEvent* AsBeforeAfterKeyboardEvent() override
{
return this;
}
InternalBeforeAfterKeyboardEvent(bool aIsTrusted, EventMessage aMessage,
nsIWidget* aWidget)
: WidgetKeyboardEvent(aIsTrusted, aMessage, aWidget,
eBeforeAfterKeyboardEventClass)
{
}
virtual WidgetEvent* Duplicate() const override
{
MOZ_ASSERT(mClass == eBeforeAfterKeyboardEventClass,
"Duplicate() must be overridden by sub class");
// Not copying widget, it is a weak reference.
InternalBeforeAfterKeyboardEvent* result =
new InternalBeforeAfterKeyboardEvent(false, mMessage, nullptr);
result->AssignBeforeAfterKeyEventData(*this, true);
result->mFlags = mFlags;
return result;
}
void AssignBeforeAfterKeyEventData(
const InternalBeforeAfterKeyboardEvent& aEvent,
bool aCopyTargets)
{
AssignKeyEventData(aEvent, aCopyTargets);
mEmbeddedCancelled = aEvent.mEmbeddedCancelled;
}
void AssignBeforeAfterKeyEventData(
const WidgetKeyboardEvent& aEvent,
bool aCopyTargets)
{
AssignKeyEventData(aEvent, aCopyTargets);
}
};
/******************************************************************************
* mozilla::WidgetCompositionEvent
******************************************************************************/
class WidgetCompositionEvent : public WidgetGUIEvent
{
private:
friend class mozilla::dom::PBrowserParent;
friend class mozilla::dom::PBrowserChild;
WidgetCompositionEvent()
{
}
public:
virtual WidgetCompositionEvent* AsCompositionEvent() override
{
return this;
}
WidgetCompositionEvent(bool aIsTrusted, EventMessage aMessage,
nsIWidget* aWidget)
: WidgetGUIEvent(aIsTrusted, aMessage, aWidget, eCompositionEventClass)
, mNativeIMEContext(aWidget)
, mOriginalMessage(eVoidEvent)
{
}
virtual WidgetEvent* Duplicate() const override
{
MOZ_ASSERT(mClass == eCompositionEventClass,
"Duplicate() must be overridden by sub class");
// Not copying widget, it is a weak reference.
WidgetCompositionEvent* result =
new WidgetCompositionEvent(false, mMessage, nullptr);
result->AssignCompositionEventData(*this, true);
result->mFlags = mFlags;
return result;
}
// The composition string or the commit string. If the instance is a
// compositionstart event, this is initialized with selected text by
// TextComposition automatically.
nsString mData;
RefPtr<TextRangeArray> mRanges;
// mNativeIMEContext stores the native IME context which causes the
// composition event.
widget::NativeIMEContext mNativeIMEContext;
// If the instance is a clone of another event, mOriginalMessage stores
// the another event's mMessage.
EventMessage mOriginalMessage;
void AssignCompositionEventData(const WidgetCompositionEvent& aEvent,
bool aCopyTargets)
{
AssignGUIEventData(aEvent, aCopyTargets);
mData = aEvent.mData;
mOriginalMessage = aEvent.mOriginalMessage;
mRanges = aEvent.mRanges;
// Currently, we don't need to copy the other members because they are
// for internal use only (not available from JS).
}
bool IsComposing() const
{
return mRanges && mRanges->IsComposing();
}
uint32_t TargetClauseOffset() const
{
return mRanges ? mRanges->TargetClauseOffset() : 0;
}
uint32_t TargetClauseLength() const
{
uint32_t length = UINT32_MAX;
if (mRanges) {
length = mRanges->TargetClauseLength();
}
return length == UINT32_MAX ? mData.Length() : length;
}
uint32_t RangeCount() const
{
return mRanges ? mRanges->Length() : 0;
}
bool CausesDOMTextEvent() const
{
return mMessage == eCompositionChange ||
mMessage == eCompositionCommit ||
mMessage == eCompositionCommitAsIs;
}
bool CausesDOMCompositionEndEvent() const
{
return mMessage == eCompositionEnd ||
mMessage == eCompositionCommit ||
mMessage == eCompositionCommitAsIs;
}
bool IsFollowedByCompositionEnd() const
{
return IsFollowedByCompositionEnd(mOriginalMessage);
}
static bool IsFollowedByCompositionEnd(EventMessage aEventMessage)
{
return aEventMessage == eCompositionCommit ||
aEventMessage == eCompositionCommitAsIs;
}
};
/******************************************************************************
* mozilla::WidgetQueryContentEvent
******************************************************************************/
class WidgetQueryContentEvent : public WidgetGUIEvent
{
private:
friend class dom::PBrowserParent;
friend class dom::PBrowserChild;
WidgetQueryContentEvent()
: mSucceeded(false)
, mUseNativeLineBreak(true)
, mWithFontRanges(false)
{
MOZ_CRASH("WidgetQueryContentEvent is created without proper arguments");
}
public:
virtual WidgetQueryContentEvent* AsQueryContentEvent() override
{
return this;
}
WidgetQueryContentEvent(bool aIsTrusted, EventMessage aMessage,
nsIWidget* aWidget)
: WidgetGUIEvent(aIsTrusted, aMessage, aWidget, eQueryContentEventClass)
, mSucceeded(false)
, mUseNativeLineBreak(true)
, mWithFontRanges(false)
{
}
WidgetQueryContentEvent(EventMessage aMessage,
const WidgetQueryContentEvent& aOtherEvent)
: WidgetGUIEvent(aOtherEvent.IsTrusted(), aMessage,
const_cast<nsIWidget*>(aOtherEvent.mWidget.get()),
eQueryContentEventClass)
, mSucceeded(false)
, mUseNativeLineBreak(aOtherEvent.mUseNativeLineBreak)
, mWithFontRanges(false)
{
}
virtual WidgetEvent* Duplicate() const override
{
// This event isn't an internal event of any DOM event.
NS_ASSERTION(!IsAllowedToDispatchDOMEvent(),
"WidgetQueryContentEvent needs to support Duplicate()");
MOZ_CRASH("WidgetQueryContentEvent doesn't support Duplicate()");
}
struct Options final
{
bool mUseNativeLineBreak;
bool mRelativeToInsertionPoint;
explicit Options()
: mUseNativeLineBreak(true)
, mRelativeToInsertionPoint(false)
{
}
explicit Options(const WidgetQueryContentEvent& aEvent)
: mUseNativeLineBreak(aEvent.mUseNativeLineBreak)
, mRelativeToInsertionPoint(aEvent.mInput.mRelativeToInsertionPoint)
{
}
};
void Init(const Options& aOptions)
{
mUseNativeLineBreak = aOptions.mUseNativeLineBreak;
mInput.mRelativeToInsertionPoint = aOptions.mRelativeToInsertionPoint;
MOZ_ASSERT(mInput.IsValidEventMessage(mMessage));
}
void InitForQueryTextContent(int64_t aOffset, uint32_t aLength,
const Options& aOptions = Options())
{
NS_ASSERTION(mMessage == eQueryTextContent,
"wrong initializer is called");
mInput.mOffset = aOffset;
mInput.mLength = aLength;
Init(aOptions);
MOZ_ASSERT(mInput.IsValidOffset());
}
void InitForQueryCaretRect(int64_t aOffset,
const Options& aOptions = Options())
{
NS_ASSERTION(mMessage == eQueryCaretRect,
"wrong initializer is called");
mInput.mOffset = aOffset;
Init(aOptions);
MOZ_ASSERT(mInput.IsValidOffset());
}
void InitForQueryTextRect(int64_t aOffset, uint32_t aLength,
const Options& aOptions = Options())
{
NS_ASSERTION(mMessage == eQueryTextRect,
"wrong initializer is called");
mInput.mOffset = aOffset;
mInput.mLength = aLength;
Init(aOptions);
MOZ_ASSERT(mInput.IsValidOffset());
}
void InitForQuerySelectedText(SelectionType aSelectionType,
const Options& aOptions = Options())
{
MOZ_ASSERT(mMessage == eQuerySelectedText);
MOZ_ASSERT(aSelectionType != SelectionType::eNone);
mInput.mSelectionType = aSelectionType;
Init(aOptions);
}
void InitForQueryDOMWidgetHittest(const mozilla::LayoutDeviceIntPoint& aPoint)
{
NS_ASSERTION(mMessage == eQueryDOMWidgetHittest,
"wrong initializer is called");
mRefPoint = aPoint;
}
void InitForQueryTextRectArray(uint32_t aOffset, uint32_t aLength,
const Options& aOptions = Options())
{
NS_ASSERTION(mMessage == eQueryTextRectArray,
"wrong initializer is called");
mInput.mOffset = aOffset;
mInput.mLength = aLength;
Init(aOptions);
}
void RequestFontRanges()
{
NS_ASSERTION(mMessage == eQueryTextContent,
"not querying text content");
mWithFontRanges = true;
}
uint32_t GetSelectionStart(void) const
{
NS_ASSERTION(mMessage == eQuerySelectedText,
"not querying selection");
return mReply.mOffset + (mReply.mReversed ? mReply.mString.Length() : 0);
}
uint32_t GetSelectionEnd(void) const
{
NS_ASSERTION(mMessage == eQuerySelectedText,
"not querying selection");
return mReply.mOffset + (mReply.mReversed ? 0 : mReply.mString.Length());
}
mozilla::WritingMode GetWritingMode(void) const
{
NS_ASSERTION(mMessage == eQuerySelectedText ||
mMessage == eQueryCaretRect ||
mMessage == eQueryTextRect,
"not querying selection or text rect");
return mReply.mWritingMode;
}
bool mSucceeded;
bool mUseNativeLineBreak;
bool mWithFontRanges;
struct Input final
{
uint32_t EndOffset() const
{
CheckedInt<uint32_t> endOffset =
CheckedInt<uint32_t>(mOffset) + mLength;
return NS_WARN_IF(!endOffset.isValid()) ? UINT32_MAX : endOffset.value();
}
int64_t mOffset;
uint32_t mLength;
SelectionType mSelectionType;
// If mOffset is true, mOffset is relative to the start offset of
// composition if there is, otherwise, the start of the first selection
// range.
bool mRelativeToInsertionPoint;
Input()
: mOffset(0)
, mLength(0)
, mSelectionType(SelectionType::eNormal)
, mRelativeToInsertionPoint(false)
{
}
bool IsValidOffset() const
{
return mRelativeToInsertionPoint || mOffset >= 0;
}
bool IsValidEventMessage(EventMessage aEventMessage) const
{
if (!mRelativeToInsertionPoint) {
return true;
}
switch (aEventMessage) {
case eQueryTextContent:
case eQueryCaretRect:
case eQueryTextRect:
return true;
default:
return false;
}
}
bool MakeOffsetAbsolute(uint32_t aInsertionPointOffset)
{
if (NS_WARN_IF(!mRelativeToInsertionPoint)) {
return true;
}
mRelativeToInsertionPoint = false;
// If mOffset + aInsertionPointOffset becomes negative value,
// we should assume the absolute offset is 0.
if (mOffset < 0 && -mOffset > aInsertionPointOffset) {
mOffset = 0;
return true;
}
// Otherwise, we don't allow too large offset.
CheckedInt<uint32_t> absOffset = mOffset + aInsertionPointOffset;
if (NS_WARN_IF(!absOffset.isValid())) {
mOffset = UINT32_MAX;
return false;
}
mOffset = absOffset.value();
return true;
}
} mInput;
struct Reply final
{
void* mContentsRoot;
uint32_t mOffset;
// mTentativeCaretOffset is used by only eQueryCharacterAtPoint.
// This is the offset where caret would be if user clicked at the mRefPoint.
uint32_t mTentativeCaretOffset;
nsString mString;
// mRect is used by eQueryTextRect, eQueryCaretRect, eQueryCharacterAtPoint
// and eQueryEditorRect. The coordinates is system coordinates relative to
// the top level widget of mFocusedWidget. E.g., if a <xul:panel> which
// is owned by a window has focused editor, the offset of mRect is relative
// to the owner window, not the <xul:panel>.
mozilla::LayoutDeviceIntRect mRect;
// The return widget has the caret. This is set at all query events.
nsIWidget* mFocusedWidget;
// mozilla::WritingMode value at the end (focus) of the selection
mozilla::WritingMode mWritingMode;
// Used by eQuerySelectionAsTransferable
nsCOMPtr<nsITransferable> mTransferable;
// Used by eQueryTextContent with font ranges requested
AutoTArray<mozilla::FontRange, 1> mFontRanges;
// Used by eQueryTextRectArray
nsTArray<mozilla::LayoutDeviceIntRect> mRectArray;
// true if selection is reversed (end < start)
bool mReversed;
// true if the selection exists
bool mHasSelection;
// true if DOM element under mouse belongs to widget
bool mWidgetIsHit;
Reply()
: mContentsRoot(nullptr)
, mOffset(NOT_FOUND)
, mTentativeCaretOffset(NOT_FOUND)
, mFocusedWidget(nullptr)
, mReversed(false)
, mHasSelection(false)
, mWidgetIsHit(false)
{
}
} mReply;
enum
{
NOT_FOUND = UINT32_MAX
};
// values of mComputedScrollAction
enum
{
SCROLL_ACTION_NONE,
SCROLL_ACTION_LINE,
SCROLL_ACTION_PAGE
};
};
/******************************************************************************
* mozilla::WidgetSelectionEvent
******************************************************************************/
class WidgetSelectionEvent : public WidgetGUIEvent
{
private:
friend class mozilla::dom::PBrowserParent;
friend class mozilla::dom::PBrowserChild;
WidgetSelectionEvent()
: mOffset(0)
, mLength(0)
, mReversed(false)
, mExpandToClusterBoundary(true)
, mSucceeded(false)
, mUseNativeLineBreak(true)
{
}
public:
virtual WidgetSelectionEvent* AsSelectionEvent() override
{
return this;
}
WidgetSelectionEvent(bool aIsTrusted, EventMessage aMessage,
nsIWidget* aWidget)
: WidgetGUIEvent(aIsTrusted, aMessage, aWidget, eSelectionEventClass)
, mOffset(0)
, mLength(0)
, mReversed(false)
, mExpandToClusterBoundary(true)
, mSucceeded(false)
, mUseNativeLineBreak(true)
, mReason(nsISelectionListener::NO_REASON)
{
}
virtual WidgetEvent* Duplicate() const override
{
// This event isn't an internal event of any DOM event.
NS_ASSERTION(!IsAllowedToDispatchDOMEvent(),
"WidgetSelectionEvent needs to support Duplicate()");
MOZ_CRASH("WidgetSelectionEvent doesn't support Duplicate()");
return nullptr;
}
// Start offset of selection
uint32_t mOffset;
// Length of selection
uint32_t mLength;
// Selection "anchor" should be in front
bool mReversed;
// Cluster-based or character-based
bool mExpandToClusterBoundary;
// true if setting selection succeeded.
bool mSucceeded;
// true if native line breaks are used for mOffset and mLength
bool mUseNativeLineBreak;
// Fennec provides eSetSelection reason codes for downstream
// use in AccessibleCaret visibility logic.
int16_t mReason;
};
/******************************************************************************
* mozilla::InternalEditorInputEvent
******************************************************************************/
class InternalEditorInputEvent : public InternalUIEvent
{
private:
InternalEditorInputEvent()
: mIsComposing(false)
{
}
public:
virtual InternalEditorInputEvent* AsEditorInputEvent() override
{
return this;
}
InternalEditorInputEvent(bool aIsTrusted, EventMessage aMessage,
nsIWidget* aWidget)
: InternalUIEvent(aIsTrusted, aMessage, aWidget, eEditorInputEventClass)
, mIsComposing(false)
{
}
virtual WidgetEvent* Duplicate() const override
{
MOZ_ASSERT(mClass == eEditorInputEventClass,
"Duplicate() must be overridden by sub class");
// Not copying widget, it is a weak reference.
InternalEditorInputEvent* result =
new InternalEditorInputEvent(false, mMessage, nullptr);
result->AssignEditorInputEventData(*this, true);
result->mFlags = mFlags;
return result;
}
bool mIsComposing;
void AssignEditorInputEventData(const InternalEditorInputEvent& aEvent,
bool aCopyTargets)
{
AssignUIEventData(aEvent, aCopyTargets);
mIsComposing = aEvent.mIsComposing;
}
};
} // namespace mozilla
#endif // mozilla_TextEvents_h__
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку