gecko-dev/widget/TextEvents.h

493 lines
14 KiB
C++

/* -*- 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/EventForwards.h" // for KeyNameIndex, temporarily
#include "mozilla/TextRange.h"
#include "nsCOMPtr.h"
#include "nsIDOMKeyEvent.h"
#include "nsITransferable.h"
#include "nsRect.h"
#include "nsStringGlue.h"
#include "nsTArray.h"
/******************************************************************************
* virtual keycode values
******************************************************************************/
#define NS_DEFINE_VK(aDOMKeyName, aDOMKeyCode) NS_##aDOMKeyName = aDOMKeyCode
enum
{
#include "nsVKList.h"
};
#undef NS_DEFINE_VK
#define kLatestSeqno UINT32_MAX
namespace mozilla {
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(uint32_t aUnshiftedCharCode, uint32_t aShiftedCharCode) :
mUnshiftedCharCode(aUnshiftedCharCode), mShiftedCharCode(aShiftedCharCode)
{
}
uint32_t mUnshiftedCharCode;
uint32_t mShiftedCharCode;
};
/******************************************************************************
* mozilla::WidgetKeyboardEvent
******************************************************************************/
class WidgetKeyboardEvent : public WidgetInputEvent
{
private:
friend class dom::PBrowserParent;
friend class dom::PBrowserChild;
WidgetKeyboardEvent()
{
}
public:
virtual WidgetKeyboardEvent* AsKeyboardEvent() MOZ_OVERRIDE { return this; }
WidgetKeyboardEvent(bool aIsTrusted, uint32_t aMessage, nsIWidget* aWidget) :
WidgetInputEvent(aIsTrusted, aMessage, aWidget, NS_KEY_EVENT),
keyCode(0), charCode(0),
location(nsIDOMKeyEvent::DOM_KEY_LOCATION_STANDARD),
isChar(false), mIsRepeat(false),
mKeyNameIndex(mozilla::KEY_NAME_INDEX_Unidentified),
mNativeKeyEvent(nullptr),
mUniqueId(0)
{
}
virtual WidgetEvent* Duplicate() const MOZ_OVERRIDE
{
MOZ_ASSERT(eventStructType == NS_KEY_EVENT,
"Duplicate() must be overridden by sub class");
// Not copying widget, it is a weak reference.
WidgetKeyboardEvent* result =
new WidgetKeyboardEvent(false, message, nullptr);
result->AssignKeyEventData(*this, true);
result->mFlags = mFlags;
return result;
}
// A DOM keyCode value or 0. If a keypress event whose charCode is 0, this
// should be 0.
uint32_t keyCode;
// 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 charCode;
// One of nsIDOMKeyEvent::DOM_KEY_LOCATION_*
uint32_t location;
// OS translated Unicode chars which are used for accesskey and accelkey
// handling. The handlers will try from first character to last character.
nsTArray<AlternativeCharCode> alternativeCharCodes;
// Indicates whether the event signifies a printable character
bool isChar;
// Indicates whether the event is generated by auto repeat or not.
// if this is keyup event, always false.
bool mIsRepeat;
// DOM KeyboardEvent.key
KeyNameIndex mKeyNameIndex;
// DOM KeyboardEvent.key only when mKeyNameIndex is KEY_NAME_INDEX_USE_STRING.
nsString mKeyValue;
// OS-specific native event can optionally be preserved
void* mNativeKeyEvent;
// 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;
void GetDOMKeyName(nsAString& aKeyName)
{
if (mKeyNameIndex == KEY_NAME_INDEX_USE_STRING) {
aKeyName = mKeyValue;
return;
}
GetDOMKeyName(mKeyNameIndex, aKeyName);
}
static void GetDOMKeyName(mozilla::KeyNameIndex aKeyNameIndex,
nsAString& aKeyName);
void AssignKeyEventData(const WidgetKeyboardEvent& aEvent, bool aCopyTargets)
{
AssignInputEventData(aEvent, aCopyTargets);
keyCode = aEvent.keyCode;
charCode = aEvent.charCode;
location = aEvent.location;
alternativeCharCodes = aEvent.alternativeCharCodes;
isChar = aEvent.isChar;
mIsRepeat = aEvent.mIsRepeat;
mKeyNameIndex = aEvent.mKeyNameIndex;
mKeyValue = aEvent.mKeyValue;
// Don't copy mNativeKeyEvent because it may be referred after its instance
// is destroyed.
mNativeKeyEvent = nullptr;
mUniqueId = aEvent.mUniqueId;
}
};
/******************************************************************************
* mozilla::WidgetTextEvent
*
* XXX WidgetTextEvent is fired with compositionupdate event almost every time.
* This wastes performance and the cost of mantaining each platform's
* implementation. Therefore, we should merge WidgetTextEvent and
* WidgetCompositionEvent. Then, DOM compositionupdate should be fired
* from TextComposition automatically.
******************************************************************************/
class WidgetTextEvent : public WidgetGUIEvent
{
private:
friend class dom::PBrowserParent;
friend class dom::PBrowserChild;
friend class plugins::PPluginInstanceChild;
WidgetTextEvent()
: mSeqno(kLatestSeqno)
, rangeCount(0)
, rangeArray(nullptr)
, isChar(false)
{
}
public:
uint32_t mSeqno;
public:
virtual WidgetTextEvent* AsTextEvent() MOZ_OVERRIDE { return this; }
WidgetTextEvent(bool aIsTrusted, uint32_t aMessage, nsIWidget* aWidget)
: WidgetGUIEvent(aIsTrusted, aMessage, aWidget, NS_TEXT_EVENT)
, mSeqno(kLatestSeqno)
, rangeCount(0)
, rangeArray(nullptr)
, isChar(false)
{
}
virtual WidgetEvent* Duplicate() const MOZ_OVERRIDE
{
MOZ_ASSERT(eventStructType == NS_TEXT_EVENT,
"Duplicate() must be overridden by sub class");
// Not copying widget, it is a weak reference.
WidgetTextEvent* result = new WidgetTextEvent(false, message, nullptr);
result->AssignTextEventData(*this, true);
result->mFlags = mFlags;
return result;
}
// The composition string or the commit string.
nsString theText;
// Count of rangeArray.
uint32_t rangeCount;
// Pointer to the first item of the ranges (clauses).
// Note that the range array may not specify a caret position; in that
// case there will be no range of type NS_TEXTRANGE_CARETPOSITION in the
// array.
TextRangeArray rangeArray;
// Indicates whether the event signifies printable text.
// XXX This is not a standard, and most platforms don't set this properly.
// So, perhaps, we can get rid of this.
bool isChar;
void AssignTextEventData(const WidgetTextEvent& aEvent, bool aCopyTargets)
{
AssignGUIEventData(aEvent, aCopyTargets);
isChar = aEvent.isChar;
// Currently, we don't need to copy the other members because they are
// for internal use only (not available from JS).
}
bool IsComposing() const
{
for (uint32_t i = 0; i < rangeCount; i++) {
if (rangeArray[i].IsClause()) {
return true;
}
}
return false;
}
};
/******************************************************************************
* mozilla::WidgetCompositionEvent
******************************************************************************/
class WidgetCompositionEvent : public WidgetGUIEvent
{
private:
friend class mozilla::dom::PBrowserParent;
friend class mozilla::dom::PBrowserChild;
WidgetCompositionEvent()
: mSeqno(kLatestSeqno)
{
}
public:
uint32_t mSeqno;
public:
virtual WidgetCompositionEvent* AsCompositionEvent() MOZ_OVERRIDE
{
return this;
}
WidgetCompositionEvent(bool aIsTrusted, uint32_t aMessage,
nsIWidget* aWidget)
: WidgetGUIEvent(aIsTrusted, aMessage, aWidget, NS_COMPOSITION_EVENT)
, mSeqno(kLatestSeqno)
{
// XXX compositionstart is cancelable in draft of DOM3 Events.
// However, it doesn't make sense for us, we cannot cancel composition
// when we send compositionstart event.
mFlags.mCancelable = false;
}
virtual WidgetEvent* Duplicate() const MOZ_OVERRIDE
{
MOZ_ASSERT(eventStructType == NS_COMPOSITION_EVENT,
"Duplicate() must be overridden by sub class");
// Not copying widget, it is a weak reference.
WidgetCompositionEvent* result =
new WidgetCompositionEvent(false, message, 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 data;
void AssignCompositionEventData(const WidgetCompositionEvent& aEvent,
bool aCopyTargets)
{
AssignGUIEventData(aEvent, aCopyTargets);
data = aEvent.data;
}
};
/******************************************************************************
* mozilla::WidgetQueryContentEvent
******************************************************************************/
class WidgetQueryContentEvent : public WidgetGUIEvent
{
private:
friend class dom::PBrowserParent;
friend class dom::PBrowserChild;
WidgetQueryContentEvent()
{
MOZ_CRASH("WidgetQueryContentEvent is created without proper arguments");
}
public:
virtual WidgetQueryContentEvent* AsQueryContentEvent() MOZ_OVERRIDE
{
return this;
}
WidgetQueryContentEvent(bool aIsTrusted, uint32_t aMessage,
nsIWidget* aWidget) :
WidgetGUIEvent(aIsTrusted, aMessage, aWidget, NS_QUERY_CONTENT_EVENT),
mSucceeded(false), mWasAsync(false)
{
}
virtual WidgetEvent* Duplicate() const MOZ_OVERRIDE
{
// This event isn't an internal event of any DOM event.
MOZ_CRASH("WidgetQueryContentEvent doesn't support Duplicate()");
return nullptr;
}
void InitForQueryTextContent(uint32_t aOffset, uint32_t aLength)
{
NS_ASSERTION(message == NS_QUERY_TEXT_CONTENT,
"wrong initializer is called");
mInput.mOffset = aOffset;
mInput.mLength = aLength;
}
void InitForQueryCaretRect(uint32_t aOffset)
{
NS_ASSERTION(message == NS_QUERY_CARET_RECT,
"wrong initializer is called");
mInput.mOffset = aOffset;
}
void InitForQueryTextRect(uint32_t aOffset, uint32_t aLength)
{
NS_ASSERTION(message == NS_QUERY_TEXT_RECT,
"wrong initializer is called");
mInput.mOffset = aOffset;
mInput.mLength = aLength;
}
void InitForQueryDOMWidgetHittest(const mozilla::LayoutDeviceIntPoint& aPoint)
{
NS_ASSERTION(message == NS_QUERY_DOM_WIDGET_HITTEST,
"wrong initializer is called");
refPoint = aPoint;
}
uint32_t GetSelectionStart(void) const
{
NS_ASSERTION(message == NS_QUERY_SELECTED_TEXT,
"not querying selection");
return mReply.mOffset + (mReply.mReversed ? mReply.mString.Length() : 0);
}
uint32_t GetSelectionEnd(void) const
{
NS_ASSERTION(message == NS_QUERY_SELECTED_TEXT,
"not querying selection");
return mReply.mOffset + (mReply.mReversed ? 0 : mReply.mString.Length());
}
bool mSucceeded;
bool mWasAsync;
struct
{
uint32_t mOffset;
uint32_t mLength;
} mInput;
struct
{
void* mContentsRoot;
uint32_t mOffset;
nsString mString;
// Finally, the coordinates is system coordinates.
nsIntRect mRect;
// The return widget has the caret. This is set at all query events.
nsIWidget* mFocusedWidget;
// 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;
// used by NS_QUERY_SELECTION_AS_TRANSFERABLE
nsCOMPtr<nsITransferable> mTransferable;
} 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()
: mSeqno(kLatestSeqno)
, mOffset(0)
, mLength(0)
, mReversed(false)
, mExpandToClusterBoundary(true)
, mSucceeded(false)
{
}
public:
uint32_t mSeqno;
public:
virtual WidgetSelectionEvent* AsSelectionEvent() MOZ_OVERRIDE
{
return this;
}
WidgetSelectionEvent(bool aIsTrusted, uint32_t aMessage, nsIWidget* aWidget)
: WidgetGUIEvent(aIsTrusted, aMessage, aWidget, NS_SELECTION_EVENT)
, mSeqno(kLatestSeqno)
, mOffset(0)
, mLength(0)
, mReversed(false)
, mExpandToClusterBoundary(true)
, mSucceeded(false)
{
}
virtual WidgetEvent* Duplicate() const MOZ_OVERRIDE
{
// This event isn't an internal event of any DOM event.
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;
};
} // namespace mozilla
#endif // mozilla_TextEvents_h__