AndroidWebBrowserWidget.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
 
#if USE_ANDROID_JNI
 
#include "Widgets/SLeafWidget.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "AndroidWebBrowserWindow.h"
#include "AndroidWebBrowserDialog.h"
#include "Android/AndroidJava.h"
#include "RHI.h"
#include "RHIResources.h"
#include "UObject/Class.h"
#include "UObject/UObjectGlobals.h"
#include "AndroidJavaWebBrowser.h"
#include "Engine/Texture2D.h"
#include "Materials/MaterialInstanceDynamic.h"
#include "WebBrowserTexture.h"
 
#include <jni.h>
 
class UMaterialExpressionTextureSample;
class FWebBrowserTextureSamplePool;
 
class SAndroidWebBrowserWidget : public SViewport
{
    SLATE_BEGIN_ARGS(SAndroidWebBrowserWidget)
        : _InitialURL("about:blank")
        , _UseTransparency(false)
    { }
 
        SLATE_ARGUMENT(FString, InitialURL);
        SLATE_ARGUMENT(bool, UseTransparency);
        SLATE_ARGUMENT(TSharedPtr<FAndroidWebBrowserWindow>, WebBrowserWindow);
        SLATE_ARGUMENT(FString, UserAgentApplication);
 
    SLATE_END_ARGS()
 
public:
    virtual ~SAndroidWebBrowserWidget();
 
    void Construct(const FArguments& Args);
 
    virtual int32 OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyCullingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled) const override;
    virtual void Tick(const FGeometry& AllottedGeometry, const double InCurrentTime, const float InDeltaTime) override;
    virtual FVector2D ComputeDesiredSize(float) const override;
 
    void ExecuteJavascript(const FString& Script);
    void LoadURL(const FString& NewURL);
    void LoadString(const FString& Content, const FString& BaseUrl);
 
    void StopLoad();
    void Reload();
    void Close();
    void ShowFloatingCloseButton(bool bShow, bool bDraggable);
    void GoBack();
    void GoForward();
    bool CanGoBack();
    bool CanGoForward();
    void FloatingCloseButtonPressed();
 
    virtual FReply OnMouseButtonDown(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent) override;
    virtual FReply OnMouseButtonUp(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent) override;
    virtual FReply OnMouseMove(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent) override;
 
    void SendTouchDown(FVector2D Position);
    void SendTouchUp(FVector2D Position);
    void SendTouchMove(FVector2D Position);
 
    virtual FReply OnKeyDown(const FGeometry& MyGeometry, const FKeyEvent& InKeyEvent) override;
    virtual FReply OnKeyUp(const FGeometry& MyGeometry, const FKeyEvent& InKeyEvent) override;
    virtual FReply OnKeyChar(const FGeometry& MyGeometry, const FCharacterEvent& InCharacterEvent) override;
 
    // WebViewClient callbacks
 
    jbyteArray HandleShouldInterceptRequest(jstring JUrl);
 
    bool HandleShouldOverrideUrlLoading(jstring JUrl);
    bool HandleJsDialog(EWebBrowserDialogType Type, jstring JUrl, jstring MessageText, jobject ResultCallback)
    {
        TSharedPtr<IWebBrowserDialog> Dialog(new FWebBrowserDialog(Type, MessageText, ResultCallback));
        return HandleJsDialog(Dialog);
    }
 
    bool HandleJsPrompt(jstring JUrl, jstring MessageText, jstring DefaultPrompt, jobject ResultCallback)
    {
        TSharedPtr<IWebBrowserDialog> Dialog(new FWebBrowserDialog(MessageText, DefaultPrompt, ResultCallback));
        return HandleJsDialog(Dialog);
    }
 
    void HandleReceivedTitle(jstring JTitle);
    void HandlePageLoad(jstring JUrl, bool bIsLoading, int InHistorySize, int InHistoryPosition);
    void HandleReceivedError(jint ErrorCode, jstring JMessage, jstring JUrl);
 
    // Helper to get the native widget pointer from a Java callback.
    // Jobj can either be a WebViewControl, a WebViewControl.ViewClient or WebViewControl.ChromeClient instance
    static TSharedPtr<SAndroidWebBrowserWidget> GetWidgetPtr(JNIEnv* JEnv, jobject Jobj);
 
    //set the native control's visibility
    void SetWebBrowserVisibility(bool InIsVisible);
protected:
    static FCriticalSection WebControlsCS;
    static TMap<int64, TWeakPtr<SAndroidWebBrowserWidget>> AllWebControls;
 
    bool HandleJsDialog(TSharedPtr<IWebBrowserDialog>& Dialog);
    int HistorySize;
    int HistoryPosition;
 
    TWeakPtr<FAndroidWebBrowserWindow> WebBrowserWindowPtr;
private:
    FVector2D ConvertMouseEventToLocal(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent);
 
    bool IsAndroid3DBrowser;
 
    bool bShouldUseBitmapRender;
 
    bool bMouseCapture;
 
    TSharedPtr<FJavaAndroidWebBrowser, ESPMode::ThreadSafe> JavaWebBrowser;
 
    UWebBrowserTexture* WebBrowserTexture;
 
    UMaterialInstanceDynamic* WebBrowserMaterial;
 
    TSharedPtr<FSlateBrush> WebBrowserBrush;
 
    TSharedPtr<FWebBrowserTextureSampleQueue, ESPMode::ThreadSafe> WebBrowserTextureSamplesQueue;
 
    FWebBrowserTextureSamplePool* TextureSamplePool;
};
 
#endif // USE_ANDROID_JNI