UE官方教程
CommonUI重要特点
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Common UI 本质上来说就是把UI当成栈，你可以push不同的widget到不同的栈上面。然后栈本身又会存到栈里面，显示最上层的栈元素所包含的元素
![image]()
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The Viewport is the base for all input routing in Common UI. When Common UI captures input, it sends it to the Viewport first, which then sends it to whichever root node is drawn on top
简单的来说，输入只会对进入当前最顶层的Widget。然后输入只会传给目前Focus的那个UI -
CommonUI的CommonUIInputData 是全局设置，Click对于CommonButton来说是自动设定，Back是针对当前层的widget而言
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注册WBP级别的内容，其实也就是注册一下Back
void URswWidget_OptionScreen::NativeOnInitialized()
{Super::NativeOnInitialized();if (!ResetAction.IsNull()){ResetActionHandle = RegisterUIActionBinding(FBindUIActionArgs(ResetAction,true,FSimpleDelegate::CreateUObject(this, &ThisClass::OnResetBoundActionTriggered)));}RegisterUIActionBinding(FBindUIActionArgs(ICommonInputModule::GetSettings().GetDefaultBackAction(),true,FSimpleDelegate::CreateUObject(this, &ThisClass::OnBackBoundActionTriggered)));
}
对应于蓝图的这个位置，上面代码就是操作性更强一点
- 对button注册行为。 这里Click没注册，就是因为 3 里面提到的Click对于button是自动注册的
// 遍历按钮信息数组，创建按钮, 按钮数量和EConfirmScreenType有关for (const FConfirmScreenButtonInfo& AvailableButtonInfo : InScreenInfoObject->AvailableScreenButtons){FDataTableRowHandle InputActionRowHandle;// ICommonInputModule 可以看下源码，就是去拿配置的默认输入动作switch (AvailableButtonInfo.ConfirmScreenButtonType){case EConfirmScreenButtonType::Cancelled:InputActionRowHandle = ICommonInputModule::GetSettings().GetDefaultBackAction();break;case EConfirmScreenButtonType::Closed:InputActionRowHandle = ICommonInputModule::GetSettings().GetDefaultBackAction();break;default:break;}// Entry理解为一个占住一个位置（停车位），DynamicEntry理解为动态entry数组。每个entry可以放不同类型URswCommonButtonBase* AddedButton = DynamicEntryBox_Buttons->CreateEntry<URswCommonButtonBase>();AddedButton->SetButtonText(AvailableButtonInfo.ButtonTextToDisplay);AddedButton->SetTriggeringInputAction(InputActionRowHandle);AddedButton->OnClicked().AddLambda([ClickedButtonCallback, AvailableButtonInfo, this]() {ClickedButtonCallback(AvailableButtonInfo.ConfirmScreenButtonType);DeactivateWidget();});}