KeyboardLayout.h
/* -*- 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 KeyboardLayout_h__
#define KeyboardLayout_h__
#include "nscore.h"
#include "nsAutoPtr.h"
#include "nsString.h"
#include "nsWindowBase.h"
#include "nsWindowDefs.h"
#include "mozilla/Attributes.h"
#include "mozilla/EventForwards.h"
#include <windows.h>
#define NS_NUM_OF_KEYS 70
#define VK_OEM_1 0xBA // ';:' for US
#define VK_OEM_PLUS 0xBB // '+' any country
#define VK_OEM_COMMA 0xBC
#define VK_OEM_MINUS 0xBD // '-' any country
#define VK_OEM_PERIOD 0xBE
#define VK_OEM_2 0xBF
#define VK_OEM_3 0xC0
// '/?' for Brazilian (ABNT)
#define VK_ABNT_C1 0xC1
// Separator in Numpad for Brazilian (ABNT) or JIS keyboard for Mac.
#define VK_ABNT_C2 0xC2
#define VK_OEM_4 0xDB
#define VK_OEM_5 0xDC
#define VK_OEM_6 0xDD
#define VK_OEM_7 0xDE
#define VK_OEM_8 0xDF
#define VK_OEM_102 0xE2
#define VK_OEM_CLEAR 0xFE
class nsIIdleServiceInternal;
struct nsModifierKeyState;
namespace mozilla {
namespace widget {
static const uint32_t sModifierKeyMap[][3] = {
{ nsIWidget::CAPS_LOCK, VK_CAPITAL, 0 },
{ nsIWidget::NUM_LOCK, VK_NUMLOCK, 0 },
{ nsIWidget::SHIFT_L, VK_SHIFT, VK_LSHIFT },
{ nsIWidget::SHIFT_R, VK_SHIFT, VK_RSHIFT },
{ nsIWidget::CTRL_L, VK_CONTROL, VK_LCONTROL },
{ nsIWidget::CTRL_R, VK_CONTROL, VK_RCONTROL },
{ nsIWidget::ALT_L, VK_MENU, VK_LMENU },
{ nsIWidget::ALT_R, VK_MENU, VK_RMENU }
};
class KeyboardLayout;
class ModifierKeyState
{
public:
ModifierKeyState();
ModifierKeyState(bool aIsShiftDown, bool aIsControlDown, bool aIsAltDown);
ModifierKeyState(Modifiers aModifiers);
MOZ_ALWAYS_INLINE void Update();
MOZ_ALWAYS_INLINE void Unset(Modifiers aRemovingModifiers);
void Set(Modifiers aAddingModifiers);
void InitInputEvent(WidgetInputEvent& aInputEvent) const;
bool IsShift() const;
bool IsControl() const;
MOZ_ALWAYS_INLINE bool IsAlt() const;
MOZ_ALWAYS_INLINE bool IsAltGr() const;
MOZ_ALWAYS_INLINE bool IsWin() const;
MOZ_ALWAYS_INLINE bool IsCapsLocked() const;
MOZ_ALWAYS_INLINE bool IsNumLocked() const;
MOZ_ALWAYS_INLINE bool IsScrollLocked() const;
MOZ_ALWAYS_INLINE Modifiers GetModifiers() const;
private:
Modifiers mModifiers;
MOZ_ALWAYS_INLINE void EnsureAltGr();
void InitMouseEvent(WidgetInputEvent& aMouseEvent) const;
};
struct UniCharsAndModifiers
{
// Dead-key + up to 4 characters
char16_t mChars[5];
Modifiers mModifiers[5];
uint32_t mLength;
UniCharsAndModifiers() : mLength(0) {}
UniCharsAndModifiers operator+(const UniCharsAndModifiers& aOther) const;
UniCharsAndModifiers& operator+=(const UniCharsAndModifiers& aOther);
/**
* Append a pair of unicode character and the final modifier.
*/
void Append(char16_t aUniChar, Modifiers aModifiers);
void Clear() { mLength = 0; }
bool IsEmpty() const { return !mLength; }
void FillModifiers(Modifiers aModifiers);
bool UniCharsEqual(const UniCharsAndModifiers& aOther) const;
bool UniCharsCaseInsensitiveEqual(const UniCharsAndModifiers& aOther) const;
nsString ToString() const { return nsString(mChars, mLength); }
};
struct DeadKeyEntry;
class DeadKeyTable;
class VirtualKey
{
public:
// 0 - Normal
// 1 - Shift
// 2 - Control
// 3 - Control + Shift
// 4 - Alt
// 5 - Alt + Shift
// 6 - Alt + Control (AltGr)
// 7 - Alt + Control + Shift (AltGr + Shift)
// 8 - CapsLock
// 9 - CapsLock + Shift
// 10 - CapsLock + Control
// 11 - CapsLock + Control + Shift
// 12 - CapsLock + Alt
// 13 - CapsLock + Alt + Shift
// 14 - CapsLock + Alt + Control (CapsLock + AltGr)
// 15 - CapsLock + Alt + Control + Shift (CapsLock + AltGr + Shift)
enum ShiftStateFlag
{
STATE_SHIFT = 0x01,
STATE_CONTROL = 0x02,
STATE_ALT = 0x04,
STATE_CAPSLOCK = 0x08
};
typedef uint8_t ShiftState;
static ShiftState ModifiersToShiftState(Modifiers aModifiers);
static Modifiers ShiftStateToModifiers(ShiftState aShiftState);
private:
union KeyShiftState
{
struct
{
char16_t Chars[4];
} Normal;
struct
{
const DeadKeyTable* Table;
char16_t DeadChar;
} DeadKey;
};
KeyShiftState mShiftStates[16];
uint16_t mIsDeadKey;
void SetDeadKey(ShiftState aShiftState, bool aIsDeadKey)
{
if (aIsDeadKey) {
mIsDeadKey |= 1 << aShiftState;
} else {
mIsDeadKey &= ~(1 << aShiftState);
}
}
public:
static void FillKbdState(PBYTE aKbdState, const ShiftState aShiftState);
bool IsDeadKey(ShiftState aShiftState) const
{
return (mIsDeadKey & (1 << aShiftState)) != 0;
}
void AttachDeadKeyTable(ShiftState aShiftState,
const DeadKeyTable* aDeadKeyTable)
{
mShiftStates[aShiftState].DeadKey.Table = aDeadKeyTable;
}
void SetNormalChars(ShiftState aShiftState, const char16_t* aChars,
uint32_t aNumOfChars);
void SetDeadChar(ShiftState aShiftState, char16_t aDeadChar);
const DeadKeyTable* MatchingDeadKeyTable(const DeadKeyEntry* aDeadKeyArray,
uint32_t aEntries) const;
inline char16_t GetCompositeChar(ShiftState aShiftState,
char16_t aBaseChar) const;
UniCharsAndModifiers GetNativeUniChars(ShiftState aShiftState) const;
UniCharsAndModifiers GetUniChars(ShiftState aShiftState) const;
};
class MOZ_STACK_CLASS NativeKey
{
friend class KeyboardLayout;
public:
struct FakeCharMsg
{
UINT mCharCode;
UINT mScanCode;
bool mIsDeadKey;
bool mConsumed;
FakeCharMsg() :
mCharCode(0), mScanCode(0), mIsDeadKey(false), mConsumed(false)
{
}
MSG GetCharMsg(HWND aWnd) const
{
MSG msg;
msg.hwnd = aWnd;
msg.message = mIsDeadKey ? WM_DEADCHAR : WM_CHAR;
msg.wParam = static_cast<WPARAM>(mCharCode);
msg.lParam = static_cast<LPARAM>(mScanCode << 16);
msg.time = 0;
msg.pt.x = msg.pt.y = 0;
return msg;
}
};
NativeKey(nsWindowBase* aWidget,
const MSG& aMessage,
const ModifierKeyState& aModKeyState,
nsTArray<FakeCharMsg>* aFakeCharMsgs = nullptr);
/**
* Handle WM_KEYDOWN message or WM_SYSKEYDOWN message. The instance must be
* initialized with WM_KEYDOWN or WM_SYSKEYDOWN.
* Returns true if dispatched keydown event or keypress event is consumed.
* Otherwise, false.
*/
bool HandleKeyDownMessage(bool* aEventDispatched = nullptr) const;
/**
* Handles WM_CHAR message or WM_SYSCHAR message. The instance must be
* initialized with WM_KEYDOWN, WM_SYSKEYDOWN or them.
* Returns true if dispatched keypress event is consumed. Otherwise, false.
*/
bool HandleCharMessage(const MSG& aCharMsg,
bool* aEventDispatched = nullptr) const;
/**
* Handles keyup message. Returns true if the event is consumed.
* Otherwise, false.
*/
bool HandleKeyUpMessage(bool* aEventDispatched = nullptr) const;
/**
* Handles WM_APPCOMMAND message. Returns true if the event is consumed.
* Otherwise, false.
*/
bool HandleAppCommandMessage() const;
private:
nsRefPtr<nsWindowBase> mWidget;
HKL mKeyboardLayout;
MSG mMsg;
uint32_t mDOMKeyCode;
KeyNameIndex mKeyNameIndex;
CodeNameIndex mCodeNameIndex;
ModifierKeyState mModKeyState;
// mVirtualKeyCode distinguishes left key or right key of modifier key.
uint8_t mVirtualKeyCode;
// mOriginalVirtualKeyCode doesn't distinguish left key or right key of
// modifier key. However, if the given keycode is VK_PROCESS, it's resolved
// to a keycode before it's handled by IME.
uint8_t mOriginalVirtualKeyCode;
// mCommittedChars indicates the inputted characters which is committed by
// the key. If dead key fail to composite a character, mCommittedChars
// indicates both the dead characters and the base characters.
UniCharsAndModifiers mCommittedCharsAndModifiers;
WORD mScanCode;
bool mIsExtended;
bool mIsDeadKey;
// mIsPrintableKey is true if the key may be a printable key without
// any modifier keys. Otherwise, false.
// Please note that the event may not cause any text input even if this
// is true. E.g., it might be dead key state or Ctrl key may be pressed.
bool mIsPrintableKey;
nsTArray<FakeCharMsg>* mFakeCharMsgs;
// When a keydown event is dispatched at handling WM_APPCOMMAND, the computed
// virtual keycode is set to this. Even if we consume WM_APPCOMMAND message,
// Windows may send WM_KEYDOWN and WM_KEYUP message for them.
// At that time, we should not dispatch key events for them.
static uint8_t sDispatchedKeyOfAppCommand;
NativeKey()
{
MOZ_CRASH("The default constructor of NativeKey isn't available");
}
void InitWithAppCommand();
/**
* Returns true if the key event is caused by auto repeat.
*/
bool IsRepeat() const
{
switch (mMsg.message) {
case WM_KEYDOWN:
case WM_SYSKEYDOWN:
case WM_CHAR:
case WM_SYSCHAR:
case WM_DEADCHAR:
case WM_SYSDEADCHAR:
return ((mMsg.lParam & (1 << 30)) != 0);
case WM_APPCOMMAND:
if (mVirtualKeyCode) {
// If we can map the WM_APPCOMMAND to a virtual keycode, we can trust
// the result of GetKeyboardState().
BYTE kbdState[256];
memset(kbdState, 0, sizeof(kbdState));
::GetKeyboardState(kbdState);
return !!kbdState[mVirtualKeyCode];
}
// If there is no virtual keycode for the command, we dispatch both
// keydown and keyup events from WM_APPCOMMAND handler. Therefore,
// even if WM_APPCOMMAND is caused by auto key repeat, web apps receive
// a pair of DOM keydown and keyup events. I.e., KeyboardEvent.repeat
// should be never true of such keys.
return false;
default:
return false;
}
}
UINT GetScanCodeWithExtendedFlag() const;
// The result is one of nsIDOMKeyEvent::DOM_KEY_LOCATION_*.
uint32_t GetKeyLocation() const;
/**
* "Kakutei-Undo" of ATOK or WXG (both of them are Japanese IME) causes
* strange WM_KEYDOWN/WM_KEYUP/WM_CHAR message pattern. So, when this
* returns true, the caller needs to be careful for processing the messages.
*/
bool IsIMEDoingKakuteiUndo() const;
bool IsKeyDownMessage() const
{
return (mMsg.message == WM_KEYDOWN || mMsg.message == WM_SYSKEYDOWN);
}
bool IsKeyUpMessage() const
{
return (mMsg.message == WM_KEYUP || mMsg.message == WM_SYSKEYUP);
}
bool IsPrintableCharMessage(const MSG& aMSG) const
{
return IsPrintableCharMessage(aMSG.message);
}
bool IsPrintableCharMessage(UINT aMessage) const
{
return (aMessage == WM_CHAR || aMessage == WM_SYSCHAR);
}
bool IsCharMessage(const MSG& aMSG) const
{
return IsCharMessage(aMSG.message);
}
bool IsCharMessage(UINT aMessage) const
{
return (IsPrintableCharMessage(aMessage) || IsDeadCharMessage(aMessage));
}
bool IsDeadCharMessage(const MSG& aMSG) const
{
return IsDeadCharMessage(aMSG.message);
}
bool IsDeadCharMessage(UINT aMessage) const
{
return (aMessage == WM_DEADCHAR || aMessage == WM_SYSDEADCHAR);
}
bool IsSysCharMessage(const MSG& aMSG) const
{
return IsSysCharMessage(aMSG.message);
}
bool IsSysCharMessage(UINT aMessage) const
{
return (aMessage == WM_SYSCHAR || aMessage == WM_SYSDEADCHAR);
}
bool MayBeSameCharMessage(const MSG& aCharMsg1, const MSG& aCharMsg2) const;
bool IsFollowedByDeadCharMessage() const;
/**
* GetFollowingCharMessage() returns following char message of handling
* keydown event. If the message is found, this method returns true.
* Otherwise, returns false.
*
* WARNING: Even if this returns true, aCharMsg may be WM_NULL or its
* hwnd may be different window.
*/
bool GetFollowingCharMessage(MSG& aCharMsg) const;
/**
* Whether the key event can compute virtual keycode from the scancode value.
*/
bool CanComputeVirtualKeyCodeFromScanCode() const;
/**
* Wraps MapVirtualKeyEx() with MAPVK_VSC_TO_VK.
*/
uint8_t ComputeVirtualKeyCodeFromScanCode() const;
/**
* Wraps MapVirtualKeyEx() with MAPVK_VSC_TO_VK_EX.
*/
uint8_t ComputeVirtualKeyCodeFromScanCodeEx() const;
/**
* Wraps MapVirtualKeyEx() with MAPVK_VK_TO_VSC_EX or MAPVK_VK_TO_VSC.
*/
uint16_t ComputeScanCodeExFromVirtualKeyCode(UINT aVirtualKeyCode) const;
/**
* Wraps MapVirtualKeyEx() with MAPVK_VSC_TO_VK and MAPVK_VK_TO_CHAR.
*/
char16_t ComputeUnicharFromScanCode() const;
/**
* Initializes the aKeyEvent with the information stored in the instance.
*/
void InitKeyEvent(WidgetKeyboardEvent& aKeyEvent,
const ModifierKeyState& aModKeyState) const;
void InitKeyEvent(WidgetKeyboardEvent& aKeyEvent) const;
/**
* Dispatches a command event for aEventCommand.
* Returns true if the event is consumed. Otherwise, false.
*/
bool DispatchCommandEvent(uint32_t aEventCommand) const;
/**
* Dispatches the key event. Returns true if the event is consumed.
* Otherwise, false.
*/
bool DispatchKeyEvent(WidgetKeyboardEvent& aKeyEvent,
const MSG* aMsgSentToPlugin = nullptr) const;
/**
* DispatchKeyPressEventsWithKeyboardLayout() dispatches keypress event(s)
* with the information provided by KeyboardLayout class.
*/
bool DispatchKeyPressEventsWithKeyboardLayout() const;
/**
* Remove all following WM_CHAR, WM_SYSCHAR and WM_DEADCHAR messages for the
* WM_KEYDOWN or WM_SYSKEYDOWN message. Additionally, dispatches plugin
* events if it's necessary.
* Returns true if the widget is destroyed. Otherwise, false.
*/
bool DispatchPluginEventsAndDiscardsCharMessages() const;
/**
* DispatchKeyPressEventForFollowingCharMessage() dispatches keypress event
* for following WM_*CHAR message which is removed and set to aCharMsg.
* Returns true if the event is consumed. Otherwise, false.
*/
bool DispatchKeyPressEventForFollowingCharMessage(const MSG& aCharMsg) const;
/**
* Checkes whether the key event down message is handled without following
* WM_CHAR messages. For example, if following WM_CHAR message indicates
* control character input, the WM_CHAR message is unclear whether it's
* caused by a printable key with Ctrl or just a function key such as Enter
* or Backspace.
*/
bool NeedsToHandleWithoutFollowingCharMessages() const;
};
class KeyboardLayout
{
friend class NativeKey;
private:
KeyboardLayout();
~KeyboardLayout();
static KeyboardLayout* sInstance;
static nsIIdleServiceInternal* sIdleService;
struct DeadKeyTableListEntry
{
DeadKeyTableListEntry* next;
uint8_t data[1];
};
HKL mKeyboardLayout;
VirtualKey mVirtualKeys[NS_NUM_OF_KEYS];
DeadKeyTableListEntry* mDeadKeyTableListHead;
int32_t mActiveDeadKey; // -1 = no active dead-key
VirtualKey::ShiftState mDeadKeyShiftState;
bool mIsOverridden : 1;
bool mIsPendingToRestoreKeyboardLayout : 1;
static inline int32_t GetKeyIndex(uint8_t aVirtualKey);
static int CompareDeadKeyEntries(const void* aArg1, const void* aArg2,
void* aData);
static bool AddDeadKeyEntry(char16_t aBaseChar, char16_t aCompositeChar,
DeadKeyEntry* aDeadKeyArray, uint32_t aEntries);
bool EnsureDeadKeyActive(bool aIsActive, uint8_t aDeadKey,
const PBYTE aDeadKeyKbdState);
uint32_t GetDeadKeyCombinations(uint8_t aDeadKey,
const PBYTE aDeadKeyKbdState,
uint16_t aShiftStatesWithBaseChars,
DeadKeyEntry* aDeadKeyArray,
uint32_t aMaxEntries);
void DeactivateDeadKeyState();
const DeadKeyTable* AddDeadKeyTable(const DeadKeyEntry* aDeadKeyArray,
uint32_t aEntries);
void ReleaseDeadKeyTables();
/**
* Loads the specified keyboard layout. This method always clear the dead key
* state.
*/
void LoadLayout(HKL aLayout);
/**
* InitNativeKey() must be called when actually widget receives WM_KEYDOWN or
* WM_KEYUP. This method is stateful. This saves current dead key state at
* WM_KEYDOWN. Additionally, computes current inputted character(s) and set
* them to the aNativeKey.
*/
void InitNativeKey(NativeKey& aNativeKey,
const ModifierKeyState& aModKeyState);
public:
static KeyboardLayout* GetInstance();
static void Shutdown();
static void NotifyIdleServiceOfUserActivity();
static bool IsPrintableCharKey(uint8_t aVirtualKey);
/**
* IsDeadKey() returns true if aVirtualKey is a dead key with aModKeyState.
* This method isn't stateful.
*/
bool IsDeadKey(uint8_t aVirtualKey,
const ModifierKeyState& aModKeyState) const;
/**
* GetUniCharsAndModifiers() returns characters which is inputted by the
* aVirtualKey with aModKeyState. This method isn't stateful.
*/
UniCharsAndModifiers GetUniCharsAndModifiers(
uint8_t aVirtualKey,
const ModifierKeyState& aModKeyState) const;
/**
* OnLayoutChange() must be called before the first keydown message is
* received. LoadLayout() changes the keyboard state, that causes breaking
* dead key state. Therefore, we need to load the layout before the first
* keydown message.
*/
void OnLayoutChange(HKL aKeyboardLayout)
{
MOZ_ASSERT(!mIsOverridden);
LoadLayout(aKeyboardLayout);
}
/**
* OverrideLayout() loads the specified keyboard layout.
*/
void OverrideLayout(HKL aLayout)
{
mIsOverridden = true;
LoadLayout(aLayout);
}
/**
* RestoreLayout() loads the current keyboard layout of the thread.
*/
void RestoreLayout()
{
mIsOverridden = false;
mIsPendingToRestoreKeyboardLayout = true;
}
uint32_t ConvertNativeKeyCodeToDOMKeyCode(UINT aNativeKeyCode) const;
/**
* ConvertNativeKeyCodeToKeyNameIndex() returns KeyNameIndex value for
* non-printable keys (except some special keys like space key).
*/
KeyNameIndex ConvertNativeKeyCodeToKeyNameIndex(uint8_t aVirtualKey) const;
/**
* ConvertScanCodeToCodeNameIndex() returns CodeNameIndex value for
* the given scan code. aScanCode can be over 0xE000 since this method
* doesn't use Windows API.
*/
static CodeNameIndex ConvertScanCodeToCodeNameIndex(UINT aScanCode);
HKL GetLayout() const
{
return mIsPendingToRestoreKeyboardLayout ? ::GetKeyboardLayout(0) :
mKeyboardLayout;
}
/**
* This wraps MapVirtualKeyEx() API with MAPVK_VK_TO_VSC.
*/
WORD ComputeScanCodeForVirtualKeyCode(uint8_t aVirtualKeyCode) const;
/**
* Implementation of nsIWidget::SynthesizeNativeKeyEvent().
*/
nsresult SynthesizeNativeKeyEvent(nsWindowBase* aWidget,
int32_t aNativeKeyboardLayout,
int32_t aNativeKeyCode,
uint32_t aModifierFlags,
const nsAString& aCharacters,
const nsAString& aUnmodifiedCharacters);
};
class RedirectedKeyDownMessageManager
{
public:
/*
* If a window receives WM_KEYDOWN message or WM_SYSKEYDOWM message which is
* a redirected message, NativeKey::DispatchKeyDownAndKeyPressEvent()
* prevents to dispatch NS_KEY_DOWN event because it has been dispatched
* before the message was redirected. However, in some cases, WM_*KEYDOWN
* message handler may not handle actually. Then, the message handler needs
* to forget the redirected message and remove WM_CHAR message or WM_SYSCHAR
* message for the redirected keydown message. AutoFlusher class is a helper
* class for doing it. This must be created in the stack.
*/
class MOZ_STACK_CLASS AutoFlusher final
{
public:
AutoFlusher(nsWindowBase* aWidget, const MSG &aMsg) :
mCancel(!RedirectedKeyDownMessageManager::IsRedirectedMessage(aMsg)),
mWidget(aWidget), mMsg(aMsg)
{
}
~AutoFlusher()
{
if (mCancel) {
return;
}
// Prevent unnecessary keypress event
if (!mWidget->Destroyed()) {
RedirectedKeyDownMessageManager::RemoveNextCharMessage(mMsg.hwnd);
}
// Foreget the redirected message
RedirectedKeyDownMessageManager::Forget();
}
void Cancel() { mCancel = true; }
private:
bool mCancel;
nsRefPtr<nsWindowBase> mWidget;
const MSG &mMsg;
};
static void WillRedirect(const MSG& aMsg, bool aDefualtPrevented)
{
sRedirectedKeyDownMsg = aMsg;
sDefaultPreventedOfRedirectedMsg = aDefualtPrevented;
}
static void Forget()
{
sRedirectedKeyDownMsg.message = WM_NULL;
}
static void PreventDefault() { sDefaultPreventedOfRedirectedMsg = true; }
static bool DefaultPrevented() { return sDefaultPreventedOfRedirectedMsg; }
static bool IsRedirectedMessage(const MSG& aMsg);
/**
* RemoveNextCharMessage() should be called by WM_KEYDOWN or WM_SYSKEYDOWM
* message handler. If there is no WM_(SYS)CHAR message for it, this
* method does nothing.
* NOTE: WM_(SYS)CHAR message is posted by TranslateMessage() API which is
* called in message loop. So, WM_(SYS)KEYDOWN message should have
* WM_(SYS)CHAR message in the queue if the keydown event causes character
* input.
*/
static void RemoveNextCharMessage(HWND aWnd);
private:
// sRedirectedKeyDownMsg is WM_KEYDOWN message or WM_SYSKEYDOWN message which
// is reirected with SendInput() API by
// widget::NativeKey::DispatchKeyDownAndKeyPressEvent()
static MSG sRedirectedKeyDownMsg;
static bool sDefaultPreventedOfRedirectedMsg;
};
} // namespace widget
} // namespace mozilla
#endif
