forked from mirrors/gecko-dev
436 lines
16 KiB
C++
436 lines
16 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 IMMHandler_h_
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#define IMMHandler_h_
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#include "nscore.h"
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#include <windows.h>
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#include "nsCOMPtr.h"
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#include "nsString.h"
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#include "nsTArray.h"
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#include "nsIWidget.h"
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#include "mozilla/EventForwards.h"
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#include "mozilla/TextEventDispatcher.h"
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#include "nsRect.h"
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#include "WritingModes.h"
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#include "npapi.h"
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class nsWindow;
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class nsWindowBase;
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namespace mozilla {
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namespace widget {
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struct MSGResult;
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class IMEContext final {
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public:
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IMEContext() : mWnd(nullptr), mIMC(nullptr) {}
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explicit IMEContext(HWND aWnd);
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explicit IMEContext(nsWindowBase* aWindowBase);
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~IMEContext() { Clear(); }
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HIMC get() const { return mIMC; }
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void Init(HWND aWnd);
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void Init(nsWindowBase* aWindowBase);
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void Clear();
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bool IsValid() const { return !!mIMC; }
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void SetOpenState(bool aOpen) const {
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if (!mIMC) {
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return;
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}
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::ImmSetOpenStatus(mIMC, aOpen);
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}
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bool GetOpenState() const {
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if (!mIMC) {
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return false;
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}
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return (::ImmGetOpenStatus(mIMC) != FALSE);
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}
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bool AssociateDefaultContext() {
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// We assume that there is only default IMC, no new IMC has been created.
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if (mIMC) {
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return false;
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}
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if (!::ImmAssociateContextEx(mWnd, nullptr, IACE_DEFAULT)) {
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return false;
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}
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mIMC = ::ImmGetContext(mWnd);
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return (mIMC != nullptr);
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}
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bool Disassociate() {
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if (!mIMC) {
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return false;
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}
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if (!::ImmAssociateContextEx(mWnd, nullptr, 0)) {
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return false;
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}
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::ImmReleaseContext(mWnd, mIMC);
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mIMC = nullptr;
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return true;
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}
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protected:
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IMEContext(const IMEContext& aOther) { MOZ_CRASH("Don't copy IMEContext"); }
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HWND mWnd;
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HIMC mIMC;
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};
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class IMMHandler final {
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public:
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static void Initialize();
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static void Terminate();
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// If Process*() returns true, the caller shouldn't do anything anymore.
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static bool ProcessMessage(nsWindow* aWindow, UINT msg, WPARAM& wParam,
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LPARAM& lParam, MSGResult& aResult);
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static bool IsComposing() { return IsComposingOnOurEditor(); }
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static bool IsComposingOn(nsWindow* aWindow) {
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return IsComposing() && IsComposingWindow(aWindow);
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}
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#ifdef DEBUG
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/**
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* IsIMEAvailable() returns TRUE when current keyboard layout has IME.
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* Otherwise, FALSE.
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*/
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static bool IsIMEAvailable() { return !!::ImmIsIME(::GetKeyboardLayout(0)); }
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#endif
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// If aForce is TRUE, these methods doesn't check whether we have composition
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// or not. If you don't set it to TRUE, these method doesn't commit/cancel
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// the composition on uexpected window.
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static void CommitComposition(nsWindow* aWindow, bool aForce = false);
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static void CancelComposition(nsWindow* aWindow, bool aForce = false);
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static void OnFocusChange(bool aFocus, nsWindow* aWindow);
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static void OnUpdateComposition(nsWindow* aWindow);
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static void OnSelectionChange(nsWindow* aWindow,
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const IMENotification& aIMENotification,
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bool aIsIMMActive);
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static IMENotificationRequests GetIMENotificationRequests();
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// Returns NS_SUCCESS_EVENT_CONSUMED if the mouse button event is consumed by
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// IME. Otherwise, NS_OK.
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static nsresult OnMouseButtonEvent(nsWindow* aWindow,
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const IMENotification& aIMENotification);
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#define DECL_IS_IME_ACTIVE(aReadableName) \
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static bool Is##aReadableName##Active();
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// Japanese IMEs
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DECL_IS_IME_ACTIVE(ATOK2006)
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DECL_IS_IME_ACTIVE(ATOK2007)
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DECL_IS_IME_ACTIVE(ATOK2008)
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DECL_IS_IME_ACTIVE(ATOK2009)
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DECL_IS_IME_ACTIVE(ATOK2010)
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DECL_IS_IME_ACTIVE(GoogleJapaneseInput)
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DECL_IS_IME_ACTIVE(Japanist2003)
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#undef DECL_IS_IME_ACTIVE
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/**
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* IsActiveIMEInBlockList() returns true if we know active keyboard layout's
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* IME has some crash bugs or something which make some damage to us. When
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* this returns true, IMC shouldn't be associated with any windows.
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*/
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static bool IsActiveIMEInBlockList();
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protected:
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static void EnsureHandlerInstance();
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static bool IsComposingOnOurEditor();
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static bool IsComposingWindow(nsWindow* aWindow);
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static bool ShouldDrawCompositionStringOurselves();
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static bool IsVerticalWritingSupported();
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// aWindow can be nullptr if it's called without receiving WM_INPUTLANGCHANGE.
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static void InitKeyboardLayout(nsWindow* aWindow, HKL aKeyboardLayout);
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static UINT GetKeyboardCodePage();
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/**
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* Checks whether the window is top level window of the composing window.
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* In this method, the top level window means in all windows, not only in all
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* OUR windows. I.e., if the aWindow is embedded, this always returns FALSE.
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*/
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static bool IsTopLevelWindowOfComposition(nsWindow* aWindow);
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static bool ProcessInputLangChangeMessage(nsWindow* aWindow, WPARAM wParam,
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LPARAM lParam, MSGResult& aResult);
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IMMHandler();
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~IMMHandler();
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// On*() methods return true if the caller of message handler shouldn't do
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// anything anymore. Otherwise, false.
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static bool OnKeyDownEvent(nsWindow* aWindow, WPARAM wParam, LPARAM lParam,
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MSGResult& aResult);
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bool OnIMEStartComposition(nsWindow* aWindow, MSGResult& aResult);
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bool OnIMEComposition(nsWindow* aWindow, WPARAM wParam, LPARAM lParam,
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MSGResult& aResult);
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bool OnIMEEndComposition(nsWindow* aWindow, MSGResult& aResult);
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bool OnIMERequest(nsWindow* aWindow, WPARAM wParam, LPARAM lParam,
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MSGResult& aResult);
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bool OnChar(nsWindow* aWindow, WPARAM wParam, LPARAM lParam,
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MSGResult& aResult);
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void OnInputLangChange(nsWindow* aWindow, WPARAM wParam, LPARAM lParam,
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MSGResult& aResult);
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// These message handlers don't use instance members, we should not create
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// the instance by the messages. So, they should be static.
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static bool OnIMEChar(nsWindow* aWindow, WPARAM wParam, LPARAM lParam,
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MSGResult& aResult);
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static bool OnIMESetContext(nsWindow* aWindow, WPARAM wParam, LPARAM lParam,
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MSGResult& aResult);
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static bool OnIMECompositionFull(nsWindow* aWindow, MSGResult& aResult);
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static bool OnIMENotify(nsWindow* aWindow, WPARAM wParam, LPARAM lParam,
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MSGResult& aResult);
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static bool OnIMESelect(nsWindow* aWindow, WPARAM wParam, LPARAM lParam,
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MSGResult& aResult);
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// The result of Handle* method mean "Processed" when it's TRUE.
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void HandleStartComposition(nsWindow* aWindow, const IMEContext& aContext);
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bool HandleComposition(nsWindow* aWindow, const IMEContext& aContext,
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LPARAM lParam);
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// If aCommitString is null, this commits composition with the latest
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// dispatched data. Otherwise, commits composition with the value.
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void HandleEndComposition(nsWindow* aWindow,
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const nsAString* aCommitString = nullptr);
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bool HandleReconvert(nsWindow* aWindow, LPARAM lParam, LRESULT* oResult);
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bool HandleQueryCharPosition(nsWindow* aWindow, LPARAM lParam,
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LRESULT* oResult);
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bool HandleDocumentFeed(nsWindow* aWindow, LPARAM lParam, LRESULT* oResult);
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/**
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* When a window's IME context is activating but we have composition on
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* another window, we should commit our composition because IME context is
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* shared by all our windows (including plug-ins).
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* @param aWindow is a new activated window.
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* If aWindow is our composing window, this method does nothing.
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* Otherwise, this commits the composition on the previous window.
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* If this method did commit a composition, this returns TRUE.
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*/
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bool CommitCompositionOnPreviousWindow(nsWindow* aWindow);
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/**
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* ResolveIMECaretPos
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* Convert the caret rect of a composition event to another widget's
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* coordinate system.
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*
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* @param aReferenceWidget The origin widget of aCursorRect.
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* Typically, this is mReferenceWidget of the
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* composing events. If the aCursorRect is in screen
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* coordinates, set nullptr.
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* @param aCursorRect The cursor rect.
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* @param aNewOriginWidget aOutRect will be in this widget's coordinates. If
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* this is nullptr, aOutRect will be in screen
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* coordinates.
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* @param aOutRect The converted cursor rect.
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*/
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void ResolveIMECaretPos(nsIWidget* aReferenceWidget,
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mozilla::LayoutDeviceIntRect& aCursorRect,
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nsIWidget* aNewOriginWidget,
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mozilla::LayoutDeviceIntRect& aOutRect);
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bool ConvertToANSIString(const nsString& aStr, UINT aCodePage,
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nsACString& aANSIStr);
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bool SetIMERelatedWindowsPos(nsWindow* aWindow, const IMEContext& aContext);
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/**
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* GetCharacterRectOfSelectedTextAt() returns character rect of the offset
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* from the selection start or the start of composition string if there is
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* a composition.
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*
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* @param aWindow The window which has focus.
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* @param aOffset Offset from the selection start or the start of
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* composition string when there is a composition.
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* This must be in the selection range or
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* the composition string.
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* @param aCharRect The result.
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* @param aWritingMode The writing mode of current selection. When this
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* is nullptr, this assumes that the selection is in
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* horizontal writing mode.
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* @return true if this succeeded to retrieve the rect.
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* Otherwise, false.
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*/
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bool GetCharacterRectOfSelectedTextAt(
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nsWindow* aWindow, uint32_t aOffset,
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mozilla::LayoutDeviceIntRect& aCharRect,
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mozilla::WritingMode* aWritingMode = nullptr);
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/**
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* GetCaretRect() returns caret rect at current selection start.
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*
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* @param aWindow The window which has focus.
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* @param aCaretRect The result.
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* @param aWritingMode The writing mode of current selection. When this
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* is nullptr, this assumes that the selection is in
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* horizontal writing mode.
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* @return true if this succeeded to retrieve the rect.
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* Otherwise, false.
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*/
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bool GetCaretRect(nsWindow* aWindow, mozilla::LayoutDeviceIntRect& aCaretRect,
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mozilla::WritingMode* aWritingMode = nullptr);
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void GetCompositionString(const IMEContext& aContext, DWORD aIndex,
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nsAString& aCompositionString) const;
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/**
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* AdjustCompositionFont() makes IME vertical writing mode if it's supported.
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* If aForceUpdate is true, it will update composition font even if writing
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* mode isn't being changed.
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*/
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void AdjustCompositionFont(nsWindow* aWindow, const IMEContext& aContext,
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const mozilla::WritingMode& aWritingMode,
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bool aForceUpdate = false);
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/**
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* MaybeAdjustCompositionFont() calls AdjustCompositionFont() when the
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* locale of active IME is CJK. Note that this creates an instance even
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* when there is no composition but the locale is CJK.
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*/
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static void MaybeAdjustCompositionFont(
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nsWindow* aWindow, const mozilla::WritingMode& aWritingMode,
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bool aForceUpdate = false);
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/**
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* Get the current target clause of composition string.
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* If there are one or more characters whose attribute is ATTR_TARGET_*,
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* this returns the first character's offset and its length.
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* Otherwise, e.g., the all characters are ATTR_INPUT, this returns
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* the composition string range because the all is the current target.
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*
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* aLength can be null (default), but aOffset must not be null.
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*
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* The aOffset value is offset in the contents. So, when you need offset
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* in the composition string, you need to subtract mCompositionStart from it.
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*/
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bool GetTargetClauseRange(uint32_t* aOffset, uint32_t* aLength = nullptr);
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/**
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* DispatchEvent() dispatches aEvent if aWidget hasn't been destroyed yet.
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*/
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static void DispatchEvent(nsWindow* aWindow, WidgetGUIEvent& aEvent);
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/**
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* DispatchCompositionChangeEvent() dispatches eCompositionChange event
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* with clause information (it'll be retrieved by CreateTextRangeArray()).
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* I.e., this should be called only during composing. If a composition is
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* being committed, only HandleCompositionEnd() should be called.
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*
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* @param aWindow The window which has the composition.
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* @param aContext Native IME context which has the composition.
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*/
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void DispatchCompositionChangeEvent(nsWindow* aWindow,
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const IMEContext& aContext);
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nsresult EnsureClauseArray(int32_t aCount);
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nsresult EnsureAttributeArray(int32_t aCount);
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/**
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* When WM_IME_CHAR is received and passed to DefWindowProc, we need to
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* record the messages. In other words, we should record the messages
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* when we receive WM_IME_CHAR on windowless plug-in (if we have focus,
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* we always eat them). When focus is moved from a windowless plug-in to
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* our window during composition, WM_IME_CHAR messages were received when
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* the plug-in has focus. However, WM_CHAR messages are received after the
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* plug-in lost focus. So, we need to ignore the WM_CHAR messages because
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* they make unexpected text input events on us.
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*/
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nsTArray<MSG> mPassedIMEChar;
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bool IsIMECharRecordsEmpty() { return mPassedIMEChar.IsEmpty(); }
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void ResetIMECharRecords() { mPassedIMEChar.Clear(); }
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void DequeueIMECharRecords(WPARAM& wParam, LPARAM& lParam) {
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MSG msg = mPassedIMEChar.ElementAt(0);
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wParam = msg.wParam;
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lParam = msg.lParam;
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mPassedIMEChar.RemoveElementAt(0);
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}
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void EnqueueIMECharRecords(WPARAM wParam, LPARAM lParam) {
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MSG msg;
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msg.wParam = wParam;
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msg.lParam = lParam;
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mPassedIMEChar.AppendElement(msg);
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}
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TextEventDispatcher* GetTextEventDispatcherFor(nsWindow* aWindow);
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nsWindow* mComposingWindow;
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RefPtr<TextEventDispatcher> mDispatcher;
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nsString mCompositionString;
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nsTArray<uint32_t> mClauseArray;
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nsTArray<uint8_t> mAttributeArray;
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int32_t mCursorPosition;
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uint32_t mCompositionStart;
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struct Selection {
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nsString mString;
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uint32_t mOffset;
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mozilla::WritingMode mWritingMode;
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bool mIsValid;
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Selection() : mOffset(UINT32_MAX), mIsValid(false) {}
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void Clear() {
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mOffset = UINT32_MAX;
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mIsValid = false;
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}
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uint32_t Length() const { return mString.Length(); }
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bool Collapsed() const { return !Length(); }
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bool IsValid() const;
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bool Update(const IMENotification& aIMENotification);
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bool Init(nsWindow* aWindow);
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bool EnsureValidSelection(nsWindow* aWindow);
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private:
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Selection(const Selection& aOther) = delete;
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void operator=(const Selection& aOther) = delete;
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};
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// mSelection stores the latest selection data only when sHasFocus is true.
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// Don't access mSelection directly. You should use GetSelection() for
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// getting proper state.
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Selection mSelection;
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Selection& GetSelection() {
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// When IME has focus, mSelection is automatically updated by
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// NOTIFY_IME_OF_SELECTION_CHANGE.
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if (sHasFocus) {
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return mSelection;
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}
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// Otherwise, i.e., While IME doesn't have focus, we cannot observe
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// selection changes. So, in such case, we need to query selection
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// when it's necessary.
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static Selection sTempSelection;
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sTempSelection.Clear();
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return sTempSelection;
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}
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bool mIsComposing;
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static mozilla::WritingMode sWritingModeOfCompositionFont;
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static nsString sIMEName;
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static UINT sCodePage;
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static DWORD sIMEProperty;
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static DWORD sIMEUIProperty;
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static bool sAssumeVerticalWritingModeNotSupported;
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static bool sHasFocus;
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};
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} // namespace widget
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} // namespace mozilla
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#endif // IMMHandler_h_
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