//创建弹窗
int textureMappingWith = 700;
       int textureMappingHeight = 500;
       TSharedPtr<SWindow> textureMapping = SNew(SWindow)
              .AutoCenter(EAutoCenter::PreferredWorkArea)
              .Title(LOCTEXT("材质框", "材质框"))
              .SizingRule(ESizingRule::FixedSize)
              .SupportsMaximize(false)
              .SupportsMinimize(false).HasCloseButton(true)
              .ClientSize(FVector2D(textureMappingWith, textureMappingHeight))
              .CreateTitleBar(false);
//创建弹窗内容
       
TSharedPtr< SWidget > content =
              SNew(SVerticalBox)
              + SVerticalBox::Slot()
              .AutoHeight()
              [
                     
SNew(SBox)
                     .HeightOverride(20)
                     [
                           SNew(SWindowTitleBarArea)//窗口标题,可以将窗口随意拖动
                                  .Content()
                                  [
                                         SNew(SVerticalBox)
                                         + SVerticalBox::Slot()
                                         .HAlign(HAlign_Right)
                                         [
                                         SNew(SButton)
                                         .Text(LOCTEXT("CloseWindows", "X"))
                                         .OnClicked(this, &FEditorModeTestEdModeToolkit::CloseWindows)
                                         ]
                                  ]
                     ]
                     //SNew(SComboBox)
              ];
//将弹窗内容添加到弹框中
       textureMapping->SetContent(content.ToSharedRef());
//显示弹窗
       FSlateApplication::Get().AddWindow(textureMapping.ToSharedRef());