C++ FKeyEvent::IsShiftDown方法代码示例

FReply SWidget::OnKeyDown( const FGeometry& MyGeometry, const FKeyEvent& InKeyEvent )
{
	if (SupportsKeyboardFocus())
	{
		EUINavigation Direction = FSlateApplicationBase::Get().GetNavigationDirectionFromKey( InKeyEvent );
		// It's the left stick return a navigation request of the correct direction
		if ( Direction != EUINavigation::Invalid )
		{
			return FReply::Handled().SetNavigation( Direction );
		}
		else if ( InKeyEvent.GetKey() == EKeys::Tab )
		{
			//@TODO: Really these uses of input should be at a lower priority, only occurring if nothing else handled them
			// For now this code prevents consuming them when some modifiers are held down, allowing some limited binding
			const bool bAllowEatingKeyEvents = !InKeyEvent.IsControlDown() && !InKeyEvent.IsAltDown() && !InKeyEvent.IsCommandDown();

			if (bAllowEatingKeyEvents)
			{
				EUINavigation MoveDirection = (InKeyEvent.IsShiftDown())
					? EUINavigation::Previous
					: EUINavigation::Next;
				return FReply::Handled().SetNavigation(MoveDirection);
			}
		}
	}
	return FReply::Unhandled();
}

FValorActionInputBinding UInputBlueprintLibrary::K2_GetInputAction(const FKeyEvent& KeyEvent)
{
	FValorActionInputBinding Binding;

	Binding.Key = KeyEvent.GetKey();
	Binding.KeyAsString = Binding.Key.GetDisplayName().ToString();

	Binding.bAlt = KeyEvent.IsAltDown();
	Binding.bCtrl = KeyEvent.IsControlDown();
	Binding.bShift = KeyEvent.IsShiftDown();
	Binding.bCmd = KeyEvent.IsCommandDown();

	return Binding;
}

FReply FTextEditHelper::OnKeyDown( const FKeyEvent& InKeyEvent, const TSharedRef< ITextEditorWidget >& TextEditor )
{
	const FKey Key = InKeyEvent.GetKey();

	if( Key == EKeys::Left )
	{
		return TextEditor->MoveCursor( FMoveCursor::Cardinal(
			// Ctrl moves a whole word instead of one character.	
			InKeyEvent.IsControlDown( ) ? ECursorMoveGranularity::Word : ECursorMoveGranularity::Character,
			// Move left
			FIntPoint( -1, 0 ),
			// Shift selects text.	
			InKeyEvent.IsShiftDown() ? ECursorAction::SelectText : ECursorAction::MoveCursor
		));
	}
	else if( Key == EKeys::Right )
	{
		return TextEditor->MoveCursor( FMoveCursor::Cardinal(
			// Ctrl moves a whole word instead of one character.	
			InKeyEvent.IsControlDown( ) ? ECursorMoveGranularity::Word : ECursorMoveGranularity::Character,
			// Move right
			FIntPoint( +1, 0 ),
			// Shift selects text.	
			InKeyEvent.IsShiftDown() ? ECursorAction::SelectText : ECursorAction::MoveCursor
		));
	}
	else if ( Key == EKeys::Up )
	{
		return TextEditor->MoveCursor( FMoveCursor::Cardinal(
			InKeyEvent.IsControlDown( ) ? ECursorMoveGranularity::Word : ECursorMoveGranularity::Character,
			// Move up
			FIntPoint( 0, -1 ),
			// Shift selects text.	
			InKeyEvent.IsShiftDown() ? ECursorAction::SelectText : ECursorAction::MoveCursor
		));
	}
	else if ( Key == EKeys::Down )
	{
		return TextEditor->MoveCursor( FMoveCursor::Cardinal(
			InKeyEvent.IsControlDown( ) ? ECursorMoveGranularity::Word : ECursorMoveGranularity::Character,
			// Move down
			FIntPoint( 0, +1 ),
			// Shift selects text.	
			InKeyEvent.IsShiftDown() ? ECursorAction::SelectText : ECursorAction::MoveCursor
		));
	}
	else if( Key == EKeys::Home )
	{
		// Go to the beginning of the document; select text if Shift is down.
		TextEditor->JumpTo(
			(InKeyEvent.IsControlDown() ) ? ETextLocation::BeginningOfDocument : ETextLocation::BeginningOfLine,
			(InKeyEvent.IsShiftDown()) ? ECursorAction::SelectText : ECursorAction::MoveCursor );

		return FReply::Handled();
	}
	else if ( Key == EKeys::End )
	{
		// Go to the end of the document; select text if Shift is down.
		TextEditor->JumpTo(
			(InKeyEvent.IsControlDown() ) ? ETextLocation::EndOfDocument : ETextLocation::EndOfLine,
			(InKeyEvent.IsShiftDown()) ? ECursorAction::SelectText : ECursorAction::MoveCursor );

		return FReply::Handled();
	}
	else if( Key == EKeys::Enter && !TextEditor->GetIsReadOnly() )
	{
		FScopedTextTransaction TextTransaction(TextEditor);

		TextEditor->OnEnter();

		return FReply::Handled();
	}
	else if( Key == EKeys::Delete && !TextEditor->GetIsReadOnly() )
	{
		// @Todo: Slate keybindings support more than one set of keys. 
		// Delete to next word boundary (Ctrl+Delete)
		if (InKeyEvent.IsControlDown() && !InKeyEvent.IsAltDown() && !InKeyEvent.IsShiftDown())
		{
			TextEditor->MoveCursor( FMoveCursor::Cardinal(
				ECursorMoveGranularity::Word, 
				// Move right
				FIntPoint(+1, 0),
				// selects text.	
				ECursorAction::SelectText
			));
		}

		FScopedTextTransaction TextTransaction(TextEditor);

		// Delete selected text
		TextEditor->DeleteChar();
		
		return FReply::Handled();
	}	
	else if( Key == EKeys::Escape )
	{
		return TextEditor->OnEscape();
	}

	// @Todo: Slate keybindings support more than one set of keys. 
//.........这里部分代码省略.........