UE4 如何在程序运行时多开窗口和解锁鼠标

梦里梦外; 2022-03-30 02:42 1219阅读 0赞

### UE4 如何在程序运行时多开窗口 ###

*  窗口多开
 *   *  说明
     *  实例
 *  解锁鼠标
 *   *  这个就厉害了

# 窗口多开 #

## 说明 ##

多开窗口涉及 SWindow 的窗口类。  
在该窗口类中可以添加内容，然后再把该窗口添加到程序实例中。

## 实例 ##

demo如下所示：

*  新建c++空工程
 *  添加一个c++ actor类（我这里叫MultiWindowsActor）
 *  编写一个调用函数

//.h
    // Fill out your copyright notice in the Description page of Project Settings.
    #pragma once
    #include "CoreMinimal.h"
    #include "GameFramework/Actor.h"
    #include <Runtime/UMG/Public/Blueprint/UserWidget.h>
    #include "Runtime/Engine/Public/Slate/SceneViewport.h"
    #include "Runtime/SlateCore/Public/Widgets/SWindow.h"
    #include "Runtime/Slate/Public/Widgets/SViewport.h"
    #include "Runtime/SlateCore/Public/Widgets/SOverlay.h"
    #include "Runtime/Slate/Public/Framework/Application/SlateApplication.h"
    #include "Runtime/Slate/Public/Widgets/Layout/SConstraintCanvas.h"
    #include "MultiWindowsActor.generated.h"
    UCLASS()
    class MULTIWINDOW_API AMultiWindowsActor : public AActor
    {
        
           GENERATED_BODY()
           
    public:       
           // Sets default values for this actor's properties
           AMultiWindowsActor();
    protected:
           // Called when the game starts or when spawned
           virtual void BeginPlay() override;
           virtual void EndPlay(const EEndPlayReason::Type EndPlayReason) override;
    public:       
           // Called every frame
           virtual void Tick(float DeltaTime) override;
           
           UFUNCTION(BlueprintCallable, Category = "MutilWindows")
                  void CreateSpectatorWindow(FVector2D WindowSize, FVector2D WindowPosition, UUserWidget * showWidget, bool autoCenter);
           TSharedPtr<SWindow> SpectatorWindow = nullptr;
           EWindowMode::Type WindowMode;
           void DestroySpectatorWindow();
           bool bIsStandaloneGame = false;
    };

//.cpp
    // Fill out your copyright notice in the Description page of Project Settings.
    #include "MultiWindowsActor.h"
    // Sets default values
    AMultiWindowsActor::AMultiWindowsActor()
    {
        
           // Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
           PrimaryActorTick.bCanEverTick = true;
    }
    // Called when the game starts or when spawned
    void AMultiWindowsActor::BeginPlay()
    {
        
           Super::BeginPlay();
           
    }
    // Called every frame
    void AMultiWindowsActor::Tick(float DeltaTime)
    {
        
           Super::Tick(DeltaTime);
           
    }
    void AMultiWindowsActor::EndPlay(const EEndPlayReason::Type EndPlayReason)
    {
        
           Super::EndPlay(EndPlayReason);
           DestroySpectatorWindow();
    }
    void AMultiWindowsActor::CreateSpectatorWindow(FVector2D WindowSize, FVector2D WindowPosition, UUserWidget * showWidget, bool autoCenter)
    {
        
           //WindowMode = EWindowMode::WindowedFullscreen;
           // Create and add window
           SpectatorWindow = SNew(SWindow)
                  .ScreenPosition(WindowPosition)
                  .ClientSize(WindowSize)
                  .SizingRule(ESizingRule::UserSized)
                  .Title(FText::FromString(TEXT("Custom SpectatorWindow")))
                  .AutoCenter(autoCenter?(EAutoCenter::PrimaryWorkArea):(EAutoCenter::None))
                  .FocusWhenFirstShown(false)
                  .UseOSWindowBorder(true)
                  .UserResizeBorder(true)
                  .CreateTitleBar(true)
                  .SupportsTransparency(EWindowTransparency::PerWindow)
                  .InitialOpacity(1.0f)
                  .SupportsMaximize(true);
           SpectatorWindow->SetViewportSizeDrivenByWindow(true);
           //获取当前应用的实例
           FSlateApplication & SlateApp = FSlateApplication::Get();
           //添加新建的窗口到该实例中
           SlateApp.AddWindow(SpectatorWindow.ToSharedRef(), true);
           //新建一个内容画布
           TSharedRef<SConstraintCanvas> ViewportWidget = SNew(SConstraintCanvas);
           TSharedPtr<SWidget> SlateWidget = showWidget->TakeWidget();
           // Add slate widget to window
           ViewportWidget->AddSlot()
                  [
                         //放置添加内容的位置
                         SlateWidget.ToSharedRef()
                  ]
           ;
           ViewportWidget->SetVisibility(EVisibility::Visible);
           //内容设置
           SpectatorWindow->SetContent(ViewportWidget);
           SpectatorWindow->ShowWindow();
           //设置窗口模式
           SpectatorWindow->SetWindowMode(EWindowMode::Windowed);
           
           bIsStandaloneGame = GetWorld()->WorldType == EWorldType::Game;
    }
    void AMultiWindowsActor::DestroySpectatorWindow()
    {
        
           // Destroy window
           if (SpectatorWindow.Get() != nullptr)
           {
        
                  if (bIsStandaloneGame == false)
                  {
        
                         SpectatorWindow->RequestDestroyWindow();
                  }
                  else
                  {
        
                         SpectatorWindow->DestroyWindowImmediately();
                  }
           }
    }

编译然后打开项目文件  
新建actor继承上面的actor，然后再begin中调用，把新建的actor拖入场景中。启动项目  
（在这里建一个widget做测试，该widget只有一个按钮，点击之后打印）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RpYW54aWFvamllX2Jsb2c_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RpYW54aWFvamllX2Jsb2c_size_16_color_FFFFFF_t_70 1]  
自己编写了一个插件插件  
[小插件][Link 1]

# 解锁鼠标 #

## 这个就厉害了 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RpYW54aWFvamllX2Jsb2c_size_16_color_FFFFFF_t_70 2]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RpYW54aWFvamllX2Jsb2c_size_16_color_FFFFFF_t_70 1]: /images/20220330/3618b96956f248bc9908506bb433b096.png
[Link 1]: https://app.yinxiang.com/shard/s65/res/2bdbc738-f84f-4c7a-ba81-913f54b7f756/Plugins.zip
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RpYW54aWFvamllX2Jsb2c_size_16_color_FFFFFF_t_70 2]: /images/20220330/ce1a2281d61b4b859dae88c9b81b678d.png