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TextEvents.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/. */
#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/FontRange.h"
#include "mozilla/TextRange.h"
#include "mozilla/WritingModes.h"
#include "mozilla/dom/KeyboardEventBinding.h"
#include "nsCOMPtr.h"
#include "nsISelectionController.h"
#include "nsISelectionListener.h"
#include "nsITransferable.h"
#include "nsRect.h"
#include "nsString.h"
#include "nsTArray.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 {
enum : uint32_t
{
eKeyLocationStandard = dom::KeyboardEventBinding::DOM_KEY_LOCATION_STANDARD,
eKeyLocationLeft = dom::KeyboardEventBinding::DOM_KEY_LOCATION_LEFT,
eKeyLocationRight = dom::KeyboardEventBinding::DOM_KEY_LOCATION_RIGHT,
eKeyLocationNumpad = dom::KeyboardEventBinding::DOM_KEY_LOCATION_NUMPAD
};
const nsCString GetDOMKeyCodeName(uint32_t aKeyCode);
namespace dom {
class PBrowserParent;
class PBrowserChild;
} // namespace dom
namespace plugins {
class PPluginInstanceChild;
} // namespace plugins
enum class AccessKeyType
{
// Handle access key for chrome.
eChrome,
// Handle access key for content.
eContent,
// Don't handle access key.
eNone
};
/******************************************************************************
* 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()
: mCharCode(0)
, mIgnoreShift(0)
{
}
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::IgnoreModifierState
*
* This stores flags for modifiers that should be ignored when matching
* XBL handlers.
******************************************************************************/
struct IgnoreModifierState
{
// When mShift is true, Shift key state will be ignored.
bool mShift;
// When mOS is true, OS key state will be ignored.
bool mOS;
IgnoreModifierState()
: mShift(false)
, mOS(false)
{
}
};
/******************************************************************************
* mozilla::WidgetKeyboardEvent
******************************************************************************/
class WidgetKeyboardEvent : public WidgetInputEvent
{
private:
friend class dom::PBrowserParent;
friend class dom::PBrowserChild;
friend struct IPC::ParamTraits<WidgetKeyboardEvent>;
protected:
WidgetKeyboardEvent()
: mNativeKeyEvent(nullptr)
, mKeyCode(0)
, mCharCode(0)
, mPseudoCharCode(0)
, mLocation(eKeyLocationStandard)
, mUniqueId(0)
#ifdef XP_MACOSX
, mNativeModifierFlags(0)
, mNativeKeyCode(0)
#endif // #ifdef XP_MACOSX
, mKeyNameIndex(KEY_NAME_INDEX_Unidentified)
, mCodeNameIndex(CODE_NAME_INDEX_UNKNOWN)
, mIsRepeat(false)
, mIsComposing(false)
, mIsSynthesizedByTIP(false)
, mEditCommandsForSingleLineEditorInitialized(false)
, mEditCommandsForMultiLineEditorInitialized(false)
, mEditCommandsForRichTextEditorInitialized(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(eKeyLocationStandard)
, mUniqueId(0)
#ifdef XP_MACOSX
, mNativeModifierFlags(0)
, mNativeKeyCode(0)
#endif // #ifdef XP_MACOSX
, mKeyNameIndex(KEY_NAME_INDEX_Unidentified)
, mCodeNameIndex(CODE_NAME_INDEX_UNKNOWN)
, mIsRepeat(false)
, mIsComposing(false)
, mIsSynthesizedByTIP(false)
, mEditCommandsForSingleLineEditorInitialized(false)
, mEditCommandsForMultiLineEditorInitialized(false)
, mEditCommandsForRichTextEditorInitialized(false)
{
// If this is a keyboard event on a plugin, it shouldn't fired on content.
if (IsKeyEventOnPlugin()) {
mFlags.mOnlySystemGroupDispatchInContent = true;
StopCrossProcessForwarding();
}
}
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);
}
bool IsInputtingText() const
{
// NOTE: On some keyboard layout, some characters are inputted with Control
// key or Alt key, but at that time, widget unset the modifier flag
// from eKeyPress event.
return mMessage == eKeyPress &&
mCharCode &&
!(mModifiers & (MODIFIER_ALT |
MODIFIER_CONTROL |
MODIFIER_META |
MODIFIER_OS));
}
bool IsInputtingLineBreak() const
{
return mMessage == eKeyPress &&
mKeyNameIndex == KEY_NAME_INDEX_Enter &&
!(mModifiers & (MODIFIER_ALT |
MODIFIER_CONTROL |
MODIFIER_META |
MODIFIER_OS));
}
/**
* ShouldKeyPressEventBeFiredOnContent() should be called only when the
* instance is eKeyPress event. This returns true when the eKeyPress
* event should be fired even on content in the default event group.
*/
bool ShouldKeyPressEventBeFiredOnContent() const
{
MOZ_DIAGNOSTIC_ASSERT(mMessage == eKeyPress);
if (IsInputtingText() || IsInputtingLineBreak()) {
return true;
}
// Ctrl + Enter won't cause actual input in our editor.
// However, the other browsers fire keypress event in any platforms.
// So, for compatibility with them, we should fire keypress event for
// Ctrl + Enter too.
return mMessage == eKeyPress &&
mKeyNameIndex == KEY_NAME_INDEX_Enter &&
!(mModifiers & (MODIFIER_ALT |
MODIFIER_META |
MODIFIER_OS |
MODIFIER_SHIFT));
}
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->mEditCommandsForSingleLineEditor = mEditCommandsForSingleLineEditor;
result->mEditCommandsForMultiLineEditor = mEditCommandsForMultiLineEditor;
result->mEditCommandsForRichTextEditor = mEditCommandsForRichTextEditor;
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 eKeyLocation*
uint32_t mLocation;
// Unique id associated with a keydown / keypress event. 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 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 whether the event is synthesized from Text Input Processor
// or an actual event from nsAppShell.
bool mIsSynthesizedByTIP;
/**
* Retrieves all edit commands from mWidget. This shouldn't be called when
* the instance is an untrusted event, doesn't have widget or in non-chrome
* process.
*/
void InitAllEditCommands();
/**
* Retrieves edit commands from mWidget only for aType. This shouldn't be
* called when the instance is an untrusted event or doesn't have widget.
*/
void InitEditCommandsFor(nsIWidget::NativeKeyBindingsType aType);
/**
* PreventNativeKeyBindings() makes the instance to not cause any edit
* actions even if it matches with a native key binding.
*/
void PreventNativeKeyBindings()
{
mEditCommandsForSingleLineEditor.Clear();
mEditCommandsForMultiLineEditor.Clear();
mEditCommandsForRichTextEditor.Clear();
mEditCommandsForSingleLineEditorInitialized = true;
mEditCommandsForMultiLineEditorInitialized = true;
mEditCommandsForRichTextEditorInitialized = true;
}
/**
* EditCommandsConstRef() returns reference to edit commands for aType.
*/
const nsTArray<CommandInt>&
EditCommandsConstRef(nsIWidget::NativeKeyBindingsType aType) const
{
return const_cast<WidgetKeyboardEvent*>(this)->EditCommandsRef(aType);
}
/**
* IsEditCommandsInitialized() returns true if edit commands for aType
* was already initialized. Otherwise, false.
*/
bool IsEditCommandsInitialized(
nsIWidget::NativeKeyBindingsType aType) const
{
return const_cast<WidgetKeyboardEvent*>(this)->
IsEditCommandsInitializedRef(aType);
}
#ifdef DEBUG
/**
* AreAllEditCommandsInitialized() returns true if edit commands for all
* types were already initialized. Otherwise, false.
*/
bool AreAllEditCommandsInitialized() const
{
return mEditCommandsForSingleLineEditorInitialized &&
mEditCommandsForMultiLineEditorInitialized &&
mEditCommandsForRichTextEditorInitialized;
}
#endif // #ifdef DEBUG
/**
* Execute edit commands for aType.
*
* @return true if the caller should do nothing anymore.
* false, otherwise.
*/
typedef void (*DoCommandCallback)(Command, void*);
bool ExecuteEditCommands(nsIWidget::NativeKeyBindingsType aType,
DoCommandCallback aCallback,
void* aCallbackData);
// 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);
}
/**
* GetFallbackKeyCodeOfPunctuationKey() returns a DOM keyCode value for
* aCodeNameIndex. This is keyCode value of the key when active keyboard
* layout is ANSI (US), JIS or ABNT keyboard layout (the latter 2 layouts
* are used only when ANSI doesn't have the key). The result is useful
* if the key doesn't produce ASCII character with active keyboard layout
* nor with alternative ASCII capable keyboard layout.
*/
static uint32_t
GetFallbackKeyCodeOfPunctuationKey(CodeNameIndex aCodeNameIndex);
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) const;
/**
* 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) const;
/**
* Check whether the modifiers match with chrome access key or
* content access key.
*/
bool ModifiersMatchWithAccessKey(AccessKeyType aType) const;
/**
* Return active modifiers which may match with access key.
* For example, even if Alt is access key modifier, then, when Control,
* CapseLock and NumLock are active, this returns only MODIFIER_CONTROL.
*/
Modifiers ModifiersForAccessKeyMatching() const;
/**
* Return access key modifiers.
*/
static Modifiers AccessKeyModifiers(AccessKeyType aType);
static void Shutdown();
/**
* ComputeLocationFromCodeValue() returns one of .mLocation value
* (eKeyLocation*) which is the most preferred value for the 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;
mIsRepeat = aEvent.mIsRepeat;
mIsComposing = aEvent.mIsComposing;
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
mIsSynthesizedByTIP = aEvent.mIsSynthesizedByTIP;
// Don't copy mEditCommandsFor*Editor because it may require a lot of
// memory space. For example, if the event is dispatched but grabbed by
// a JS variable, they are not necessary anymore.
mEditCommandsForSingleLineEditorInitialized =
aEvent.mEditCommandsForSingleLineEditorInitialized;
mEditCommandsForMultiLineEditorInitialized =
aEvent.mEditCommandsForMultiLineEditorInitialized;
mEditCommandsForRichTextEditorInitialized =
aEvent.mEditCommandsForRichTextEditorInitialized;
}
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;
// mEditCommandsFor*Editor store edit commands. This should be initialized
// with InitEditCommandsFor().
// XXX Ideally, this should be array of Command rather than CommandInt.
// However, ParamTraits isn't aware of enum array.
nsTArray<CommandInt> mEditCommandsForSingleLineEditor;
nsTArray<CommandInt> mEditCommandsForMultiLineEditor;
nsTArray<CommandInt> mEditCommandsForRichTextEditor;
nsTArray<CommandInt>& EditCommandsRef(nsIWidget::NativeKeyBindingsType aType)
{
switch (aType) {
case nsIWidget::NativeKeyBindingsForSingleLineEditor:
return mEditCommandsForSingleLineEditor;
case nsIWidget::NativeKeyBindingsForMultiLineEditor:
return mEditCommandsForMultiLineEditor;
case nsIWidget::NativeKeyBindingsForRichTextEditor:
return mEditCommandsForRichTextEditor;
default:
MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE(
"Invalid native key binding type");
}
}
// mEditCommandsFor*EditorInitialized are set to true when
// InitEditCommandsFor() initializes edit commands for the type.
bool mEditCommandsForSingleLineEditorInitialized;
bool mEditCommandsForMultiLineEditorInitialized;
bool mEditCommandsForRichTextEditorInitialized;
bool& IsEditCommandsInitializedRef(nsIWidget::NativeKeyBindingsType aType)
{
switch (aType) {
case nsIWidget::NativeKeyBindingsForSingleLineEditor:
return mEditCommandsForSingleLineEditorInitialized;
case nsIWidget::NativeKeyBindingsForMultiLineEditor:
return mEditCommandsForMultiLineEditorInitialized;
case nsIWidget::NativeKeyBindingsForRichTextEditor:
return mEditCommandsForRichTextEditorInitialized;
default:
MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE(
"Invalid native key binding type");
}
}
static int32_t GenericAccessModifierKeyPref();
static int32_t ChromeAccessModifierMaskPref();
static int32_t ContentAccessModifierMaskPref();
};
/******************************************************************************
* 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;
}