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8c296bbcd4
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296 lines
9.7 KiB
C++
296 lines
9.7 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim:expandtab:shiftwidth=4:tabstop=4:
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef __nsGdkKeyUtils_h__
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#define __nsGdkKeyUtils_h__
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#include "nsEvent.h"
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#include "nsTArray.h"
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#include <gdk/gdk.h>
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namespace mozilla {
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namespace widget {
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/**
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* KeymapWrapper is a wrapper class of GdkKeymap. GdkKeymap doesn't support
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* all our needs, therefore, we need to access lower level APIs.
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* But such code is usually complex and might be slow. Against such issues,
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* we should cache some information.
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*
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* This class provides only static methods. The methods is using internal
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* singleton instance which is initialized by default GdkKeymap. When the
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* GdkKeymap is destroyed, the singleton instance will be destroyed.
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*/
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class KeymapWrapper
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{
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public:
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/**
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* Compute an our DOM keycode from a GDK keyval.
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*/
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static uint32_t ComputeDOMKeyCode(const GdkEventKey* aGdkKeyEvent);
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/**
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* Returns a GDK keyval which is related to the aDOMKeyCode. However,
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* it may not be same as original value since there are some lost
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* information.
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*/
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static guint GuessGDKKeyval(uint32_t aDOMKeyCode);
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/**
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* Modifier is list of modifiers which we support in widget level.
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*/
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enum Modifier {
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NOT_MODIFIER = 0x0000,
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CAPS_LOCK = 0x0001,
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NUM_LOCK = 0x0002,
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SCROLL_LOCK = 0x0004,
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SHIFT = 0x0008,
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CTRL = 0x0010,
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ALT = 0x0020,
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META = 0x0040,
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SUPER = 0x0080,
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HYPER = 0x0100,
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ALTGR = 0x0200
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};
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/**
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* Modifiers is used for combination of Modifier.
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* E.g., |Modifiers modifiers = (SHIFT | CTRL);| means Shift and Ctrl.
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*/
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typedef uint32_t Modifiers;
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/**
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* GetCurrentModifierState() returns current modifier key state.
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* The "current" means actual state of hardware keyboard when this is
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* called. I.e., if some key events are not still dispatched by GDK,
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* the state may mismatch with GdkEventKey::state.
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*
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* @return Current modifier key state.
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*/
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static guint GetCurrentModifierState();
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/**
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* AreModifiersCurrentlyActive() checks the "current" modifier state
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* on aGdkWindow with the keymap of the singleton instance.
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*
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* @param aModifiers One or more of Modifier values except
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* NOT_MODIFIER.
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* @return TRUE if all of modifieres in aModifiers are
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* active. Otherwise, FALSE.
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*/
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static bool AreModifiersCurrentlyActive(Modifiers aModifiers);
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/**
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* AreModifiersActive() just checks whether aModifierState indicates
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* all modifiers in aModifiers are active or not.
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*
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* @param aModifiers One or more of Modifier values except
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* NOT_MODIFIER.
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* @param aModifierState GDK's modifier states.
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* @return TRUE if aGdkModifierType indecates all of
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* modifiers in aModifier are active.
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* Otherwise, FALSE.
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*/
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static bool AreModifiersActive(Modifiers aModifiers,
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guint aModifierState);
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/**
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* InitInputEvent() initializes the aInputEvent with aModifierState.
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*/
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static void InitInputEvent(nsInputEvent& aInputEvent,
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guint aModifierState);
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/**
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* InitKeyEvent() intializes aKeyEvent's modifier key related members
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* and keycode related values.
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*
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* @param aKeyEvent It's an nsKeyEvent which needs to be
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* initialized.
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* @param aGdkKeyEvent A native GDK key event.
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*/
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static void InitKeyEvent(nsKeyEvent& aKeyEvent, GdkEventKey* aGdkKeyEvent);
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/**
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* IsKeyPressEventNecessary() returns TRUE when aGdkKeyEvent should cause
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* a DOM keypress event. Otherwise, FALSE.
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*/
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static bool IsKeyPressEventNecessary(GdkEventKey* aGdkKeyEvent);
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protected:
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/**
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* GetInstance() returns a KeymapWrapper instance.
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*
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* @return A singleton instance of KeymapWrapper.
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*/
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static KeymapWrapper* GetInstance();
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KeymapWrapper();
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~KeymapWrapper();
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bool mInitialized;
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/**
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* Initializing methods.
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*/
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void Init();
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void InitBySystemSettings();
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/**
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* mModifierKeys stores each hardware key information.
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*/
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struct ModifierKey {
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guint mHardwareKeycode;
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guint mMask;
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ModifierKey(guint aHardwareKeycode) :
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mHardwareKeycode(aHardwareKeycode), mMask(0)
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{
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}
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};
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nsTArray<ModifierKey> mModifierKeys;
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/**
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* GetModifierKey() returns modifier key information of the hardware
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* keycode. If the key isn't a modifier key, returns NULL.
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*/
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ModifierKey* GetModifierKey(guint aHardwareKeycode);
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/**
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* mModifierMasks is bit masks for each modifier. The index should be one
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* of ModifierIndex values.
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*/
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enum ModifierIndex {
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INDEX_NUM_LOCK,
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INDEX_SCROLL_LOCK,
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INDEX_ALT,
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INDEX_META,
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INDEX_SUPER,
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INDEX_HYPER,
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INDEX_ALTGR,
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COUNT_OF_MODIFIER_INDEX
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};
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guint mModifierMasks[COUNT_OF_MODIFIER_INDEX];
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guint GetModifierMask(Modifier aModifier) const;
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/**
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* @param aGdkKeyval A GDK defined modifier key value such as
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* GDK_Shift_L.
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* @return Returns Modifier values for aGdkKeyval.
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* If the given key code isn't a modifier key,
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* returns NOT_MODIFIER.
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*/
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static Modifier GetModifierForGDKKeyval(guint aGdkKeyval);
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#ifdef PR_LOGGING
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static const char* GetModifierName(Modifier aModifier);
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#endif // PR_LOGGING
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/**
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* mGdkKeymap is a wrapped instance by this class.
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*/
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GdkKeymap* mGdkKeymap;
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/**
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* Pointer of the singleton instance.
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*/
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static KeymapWrapper* sInstance;
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/**
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* Signal handlers.
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*/
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static void OnKeysChanged(GdkKeymap* aKeymap, KeymapWrapper* aKeymapWrapper);
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static void OnDestroyKeymap(KeymapWrapper* aKeymapWrapper,
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GdkKeymap *aGdkKeymap);
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/**
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* GetCharCodeFor() Computes what character is inputted by the key event
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* with aModifierState and aGroup.
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*
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* @param aGdkKeyEvent Native key event, must not be NULL.
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* @param aModifierState Combination of GdkModifierType which you
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* want to test with aGdkKeyEvent.
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* @param aGroup Set group in the mGdkKeymap.
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* @return charCode which is inputted by aGdkKeyEvent.
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* If failed, this returns 0.
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*/
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static uint32_t GetCharCodeFor(const GdkEventKey *aGdkKeyEvent);
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uint32_t GetCharCodeFor(const GdkEventKey *aGdkKeyEvent,
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guint aModifierState,
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gint aGroup);
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/**
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* GetKeyLevel() returns level of the aGdkKeyEvent in mGdkKeymap.
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*
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* @param aGdkKeyEvent Native key event, must not be NULL.
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* @return Using level. Typically, this is 0 or 1.
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* If failed, this returns -1.
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*/
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gint GetKeyLevel(GdkEventKey *aGdkKeyEvent);
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/**
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* GetFirstLatinGroup() returns group of mGdkKeymap which can input an
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* ASCII character by GDK_A.
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*
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* @return group value of GdkEventKey.
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*/
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gint GetFirstLatinGroup();
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/**
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* IsLatinGroup() checkes whether the keyboard layout of aGroup is
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* ASCII alphabet inputtable or not.
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*
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* @param aGroup The group value of GdkEventKey.
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* @return TRUE if the keyboard layout can input
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* ASCII alphabet. Otherwise, FALSE.
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*/
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bool IsLatinGroup(guint8 aGroup);
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/**
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* IsBasicLatinLetterOrNumeral() Checks whether the aCharCode is an
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* alphabet or a numeric character in ASCII.
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*
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* @param aCharCode Charcode which you want to test.
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* @return TRUE if aCharCode is an alphabet or a numeric
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* in ASCII range. Otherwise, FALSE.
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*/
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static bool IsBasicLatinLetterOrNumeral(uint32_t aCharCode);
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/**
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* GetGDKKeyvalWithoutModifier() returns the keyval for aGdkKeyEvent when
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* ignoring the modifier state except NumLock. (NumLock is a key to change
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* some key's meaning.)
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*/
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static guint GetGDKKeyvalWithoutModifier(const GdkEventKey *aGdkKeyEvent);
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/**
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* GetDOMKeyCodeFromKeyPairs() returns DOM keycode for aGdkKeyval if
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* it's in KeyPair table.
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*/
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static uint32_t GetDOMKeyCodeFromKeyPairs(guint aGdkKeyval);
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/**
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* InitKeypressEvent() intializes keyCode, charCode and
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* alternativeCharCodes of keypress event.
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*
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* @param aKeyEvent An NS_KEY_PRESS event, must not be NULL.
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* The modifier related members and keyCode must
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* be initialized already.
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* @param aGdkKeyEvent A native key event which causes dispatching
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* aKeyEvent.
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*/
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void InitKeypressEvent(nsKeyEvent& aKeyEvent, GdkEventKey* aGdkKeyEvent);
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};
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} // namespace widget
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} // namespace mozilla
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#endif /* __nsGdkKeyUtils_h__ */
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