C++ FReply::SetUserFocus方法代码示例

FReply SDetailsViewBase::OnFocusReceived(const FGeometry& MyGeometry, const FFocusEvent& InFocusEvent)
{
	FReply Reply = FReply::Handled();

	if (InFocusEvent.GetCause() != EFocusCause::Cleared)
	{
		Reply.SetUserFocus(SearchBox.ToSharedRef(), InFocusEvent.GetCause());
	}

	return Reply;
}

FReply SComboButton::OnButtonClicked()
{
	// Button was clicked; show the popup.
	// Do nothing if clicking on the button also dismissed the menu, because we will end up doing the same thing twice.
	this->SetIsOpen( ShouldOpenDueToClick(), bIsFocusable );

	// If the menu is open, execute the related delegate.
	if( IsOpen() && OnComboBoxOpened.IsBound() )
	{
		OnComboBoxOpened.Execute();
	}

	// Focusing any newly-created widgets must occur after they have been added to the UI root.
	FReply ButtonClickedReply = FReply::Handled();
	
	if (bIsFocusable)
	{
		TSharedPtr<SWidget> WidgetToFocus = WidgetToFocusPtr.Pin();
		if (!WidgetToFocus.IsValid())
		{
			// no explicitly focused widget, try to focus the content
			WidgetToFocus = MenuContent;
		}

		if (!WidgetToFocus.IsValid())
		{
			// no content, so try to focus the original widget set on construction
			WidgetToFocus = ContentWidgetPtr.Pin();
		}

		if (WidgetToFocus.IsValid())
		{
			ButtonClickedReply.SetUserFocus(WidgetToFocus.ToSharedRef(), EFocusCause::SetDirectly);
		}
	}

	return ButtonClickedReply;
}

FReply FTextEditHelper::OnMouseButtonDown( const FGeometry& MyGeometry, const FPointerEvent& InMouseEvent, const TSharedRef< ITextEditorWidget >& TextEditor )
{
	FReply Reply = FReply::Unhandled();

	// If the mouse is already captured, then don't allow a new action to be taken
	if( !TextEditor->GetWidget()->HasMouseCapture() )
	{
		if( InMouseEvent.GetEffectingButton() == EKeys::LeftMouseButton ||
			InMouseEvent.GetEffectingButton() == EKeys::RightMouseButton )
		{
			// Am I getting focus right now?
			const bool bIsGettingFocus = !TextEditor->GetWidget()->HasKeyboardFocus();
			if( bIsGettingFocus )
			{
				// We might be receiving keyboard focus due to this event.  Because the keyboard focus received callback
				// won't fire until after this function exits, we need to make sure our widget's state is in order early

				// Assume we'll be given keyboard focus, so load text for editing
				TextEditor->LoadText();

				// Reset 'mouse has moved' state.  We'll use this in OnMouseMove to determine whether we
				// should reset the selection range to the caret's position.
				TextEditor->SetWasFocusedByLastMouseDown( true );
			}

			if( InMouseEvent.GetEffectingButton() == EKeys::LeftMouseButton )
			{
				if( InMouseEvent.IsShiftDown() )
				{
					TextEditor->MoveCursor( FMoveCursor::ViaScreenPointer( MyGeometry.AbsoluteToLocal( InMouseEvent.GetScreenSpacePosition( ) ), MyGeometry.Scale, ECursorAction::SelectText ) );
				}
				else
				{
					// Deselect any text that was selected
					TextEditor->ClearSelection();
					TextEditor->MoveCursor( FMoveCursor::ViaScreenPointer( MyGeometry.AbsoluteToLocal( InMouseEvent.GetScreenSpacePosition( ) ), MyGeometry.Scale, ECursorAction::MoveCursor ) );
				}

				// Start drag selection
				TextEditor->BeginDragSelection();
			}
			else if( InMouseEvent.GetEffectingButton() == EKeys::RightMouseButton )
			{
				// If the user right clicked on a character that wasn't already selected, we'll clear
				// the selection
				if ( TextEditor->AnyTextSelected( ) && !TextEditor->IsTextSelectedAt( MyGeometry, InMouseEvent.GetScreenSpacePosition() ) )
				{
					// Deselect any text that was selected
					TextEditor->ClearSelection();
				}
			}

			// Right clicking to summon context menu, but we'll do that on mouse-up.
			Reply = FReply::Handled();
			Reply.CaptureMouse( TextEditor->GetWidget() );
			Reply.SetUserFocus(TextEditor->GetWidget(), EFocusCause::Mouse);
		}
	}

	return Reply;
}