CEFTextInputMethodContext.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
 
#if WITH_CEF3 && !PLATFORM_LINUX
 
#include "Layout/Geometry.h"
#include "Widgets/SWindow.h"
 
#if PLATFORM_WINDOWS
#include "Windows/AllowWindowsPlatformTypes.h"
#include "Windows/AllowWindowsPlatformAtomics.h"
#endif
 
#pragma push_macro("OVERRIDE")
#undef OVERRIDE // cef headers provide their own OVERRIDE macro
THIRD_PARTY_INCLUDES_START
#if PLATFORM_APPLE
PRAGMA_DISABLE_DEPRECATION_WARNINGS
#endif
#include "include/cef_client.h"
#if PLATFORM_APPLE
PRAGMA_ENABLE_DEPRECATION_WARNINGS
#endif
THIRD_PARTY_INCLUDES_END
#pragma pop_macro("OVERRIDE")
 
#if PLATFORM_WINDOWS
#include "Windows/HideWindowsPlatformAtomics.h"
#include "Windows/HideWindowsPlatformTypes.h"
#endif
 
#include "GenericPlatform/ITextInputMethodSystem.h"
#include "Layout/Geometry.h"
 
class FCEFWebBrowserWindow;
class FCEFImeHandler;
class SWindow;
 
class FCEFTextInputMethodContext : public ITextInputMethodContext
{
public:
 
    virtual ~FCEFTextInputMethodContext() {}
 
    static TSharedRef<FCEFTextInputMethodContext> Create(const TSharedRef<FCEFImeHandler>& InOwner);
 
    void AbortComposition();
 
    bool UpdateCachedGeometry(const FGeometry& AllottedGeometry);
 
    bool CEFCompositionRangeChanged(const CefRange& SelectionRange, const CefRenderHandler::RectList& CharacterBounds);
 
private:
    void ResetComposition();
 
public:
    
    // ITextInputMethodContext Interface
    virtual bool IsComposing() override;
 
private:
    virtual bool IsReadOnly() override;
    virtual uint32 GetTextLength() override;
    virtual void GetSelectionRange(uint32& BeginIndex, uint32& Length, ECaretPosition& CaretPosition) override;
    virtual void SetSelectionRange(const uint32 BeginIndex, const uint32 Length, const ECaretPosition CaretPosition) override;
    virtual void GetTextInRange(const uint32 BeginIndex, const uint32 Length, FString& OutString) override;
    virtual void SetTextInRange(const uint32 BeginIndex, const uint32 Length, const FString& InString) override;
    virtual int32 GetCharacterIndexFromPoint(const FVector2D& Point) override;
    virtual bool GetTextBounds(const uint32 BeginIndex, const uint32 Length, FVector2D& Position, FVector2D& Size) override;
    virtual void GetScreenBounds(FVector2D& Position, FVector2D& Size) override;
    virtual TSharedPtr<FGenericWindow> GetWindow() override;
    virtual void BeginComposition() override;
    virtual void UpdateCompositionRange(const int32 InBeginIndex, const uint32 InLength) override;
    virtual void EndComposition() override;
 
private:
    FCEFTextInputMethodContext(const TSharedRef<FCEFImeHandler>& InOwner);
    TSharedRef<FCEFImeHandler> Owner;
    TWeakPtr<SWindow> CachedSlateWindow;
 
    FGeometry CachedGeometry;
    bool bIsComposing;
    int32 CompositionBeginIndex;
    uint32 CompositionLength;
 
    uint32 SelectionRangeBeginIndex;
    uint32 SelectionRangeLength;
    ECaretPosition SelectionCaretPosition;
 
    std::vector<CefRect> CefCompositionBounds;
 
    FString CompositionString;
};
 
#endif