C++ FPointerEvent::IsMouseButtonDown方法代码示例

FReply SGraphEditorImpl::OnMouseButtonDown( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )
{
	if(MouseEvent.IsMouseButtonDown(EKeys::ThumbMouseButton))
	{
		OnNavigateHistoryBack.ExecuteIfBound();
	}
	else if(MouseEvent.IsMouseButtonDown(EKeys::ThumbMouseButton2))
	{
		OnNavigateHistoryForward.ExecuteIfBound();
	}
	return FReply::Handled().SetKeyboardFocus( SharedThis(this), EKeyboardFocusCause::Mouse );
}

FReply FSceneViewport::OnMouseButtonUp( const FGeometry& InGeometry, const FPointerEvent& InMouseEvent )
{
	// Start a new reply state
	CurrentReplyState = FReply::Handled();

	KeyStateMap.Add( InMouseEvent.GetEffectingButton(), false );
	UpdateModifierKeys( InMouseEvent );
	UpdateCachedMousePos( InGeometry, InMouseEvent );
	UpdateCachedGeometry(InGeometry);

	// Switch to the viewport clients world before processing input
	FScopedConditionalWorldSwitcher WorldSwitcher( ViewportClient );
	bool bCursorVisible = true;
	bool bReleaseMouse = true;
	if( ViewportClient && GetSizeXY() != FIntPoint::ZeroValue  )
	{
		if (!ViewportClient->InputKey(this, InMouseEvent.GetUserIndex(), InMouseEvent.GetEffectingButton(), IE_Released))
		{
			CurrentReplyState = FReply::Unhandled(); 
		}
		bCursorVisible = ViewportClient->GetCursor(this, GetMouseX(), GetMouseY()) != EMouseCursor::None;
		bReleaseMouse = 
			bCursorVisible || 
			ViewportClient->CaptureMouseOnClick() == EMouseCaptureMode::CaptureDuringMouseDown ||
			( ViewportClient->CaptureMouseOnClick() == EMouseCaptureMode::CaptureDuringRightMouseDown && InMouseEvent.GetEffectingButton() == EKeys::RightMouseButton );
	}
	if (!((FApp::IsGame() && !GIsEditor) || bIsPlayInEditorViewport) || bReleaseMouse)
	{
		// On mouse up outside of the game (editor viewport) or if the cursor is visible in game, we should make sure the mouse is no longer captured
		// as long as the left or right mouse buttons are not still down
		if( !InMouseEvent.IsMouseButtonDown( EKeys::RightMouseButton ) && !InMouseEvent.IsMouseButtonDown( EKeys::LeftMouseButton ))
		{
			if( bCursorHiddenDueToCapture )
			{
				bCursorHiddenDueToCapture = false;
				CurrentReplyState.SetMousePos( MousePosBeforeHiddenDueToCapture );
				MousePosBeforeHiddenDueToCapture = FIntPoint( -1, -1 );
			}

			CurrentReplyState.ReleaseMouseCapture();
			if (bCursorVisible)
			{
				CurrentReplyState.ReleaseMouseLock();
			}
		}
	}
	return CurrentReplyState;
}

FReply SColorGradientEditor::OnMouseMove( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )
{
	if( HasMouseCapture() && IsEditingEnabled.Get() == true )
	{
		DistanceDragged += FMath::Abs( MouseEvent.GetCursorDelta().X );
			
		if( MouseEvent.IsMouseButtonDown( EKeys::LeftMouseButton ) && SelectedStop.IsValid( *CurveOwner ) )
		{
			const float DragThresholdDist = 5.0f;
			if( !bDraggingStop )
			{
				if( DistanceDragged >= DragThresholdDist )
				{
					// Start a transaction, we just started dragging a stop
					bDraggingStop = true;
					GEditor->BeginTransaction( LOCTEXT("MoveGradientStop", "Move Gradient Stop") );
					CurveOwner->ModifyOwner();
				}

				return FReply::Handled();
			}
			else
			{
				// Already dragging a stop, move it
				FTrackScaleInfo ScaleInfo(ViewMinInput.Get(),  ViewMaxInput.Get(), 0.0f, 1.0f, MyGeometry.Size);
				float MouseTime = ScaleInfo.LocalXToInput( MyGeometry.AbsoluteToLocal( MouseEvent.GetScreenSpacePosition() ).X );
				MoveStop( SelectedStop, MouseTime );

				return FReply::Handled();
			}
		}
	}

	return FReply::Unhandled();
}

FReply SInlineEditableTextBlock::OnMouseButtonDown( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )
{
	if( !MouseEvent.IsMouseButtonDown(EKeys::LeftMouseButton) || MouseEvent.IsControlDown() || MouseEvent.IsShiftDown())
	{
		return FReply::Unhandled();
	}

	if(IsSelected.IsBound())
	{
		if(IsSelected.Execute() && !bIsReadOnly.Get() && !ActiveTimerHandle.IsValid())
		{
			RegisterActiveTimer(0.5f, FWidgetActiveTimerDelegate::CreateSP(this, &SInlineEditableTextBlock::TriggerEditMode));
		}
	}
	else
	{
		// The widget is not managed by another widget, so handle the mouse input and enter edit mode if ready.
		if(HasKeyboardFocus())
		{
			EnterEditingMode();
		}
		return FReply::Handled();
	}

	// Do not handle the mouse input, this will allow for drag and dropping events to trigger.
	return FReply::Unhandled();
}

FReply SWorldHierarchyItem::OnItemDragDetected(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent)
{
	if (MouseEvent.IsMouseButtonDown(EKeys::LeftMouseButton))
	{
		TSharedPtr<FLevelDragDropOp> Op = WorldModel->CreateDragDropOp();
		if (Op.IsValid())
		{
			// Start a drag-drop
			return FReply::Handled().BeginDragDrop(Op.ToSharedRef());
		}
	}

	return FReply::Unhandled();
}

FReply SPaperEditorViewport::OnMouseMove(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent)
{
	const bool bIsRightMouseButtonDown = MouseEvent.IsMouseButtonDown(EKeys::RightMouseButton);
	const bool bIsLeftMouseButtonDown = MouseEvent.IsMouseButtonDown(EKeys::LeftMouseButton);
	
	if (HasMouseCapture())
	{
		// Track how much the mouse moved since the mouse down.
		const FVector2D CursorDelta = MouseEvent.GetCursorDelta();
		TotalMouseDelta += CursorDelta.Size();

		if (bIsRightMouseButtonDown)
		{
			FReply ReplyState = FReply::Handled();

			if (!CursorDelta.IsZero())
			{
				bShowSoftwareCursor = true;
			}

			bIsPanning = true;
			ViewOffset -= CursorDelta / GetZoomAmount();

			return ReplyState;
		}
		else if (bIsLeftMouseButtonDown)
		{
//			TSharedPtr<SNode> NodeBeingDragged = NodeUnderMousePtr.Pin();

			// Update the amount to pan panel
			UpdateViewOffset(MyGeometry, MouseEvent.GetScreenSpacePosition());

			const bool bCursorInDeadZone = TotalMouseDelta <= FSlateApplication::Get().GetDragTriggerDistance();

			{
				// We are marquee selecting
				const FVector2D GraphMousePos = PanelCoordToGraphCoord( MyGeometry.AbsoluteToLocal( MouseEvent.GetScreenSpacePosition() ) );
				Marquee.Rect.UpdateEndPoint(GraphMousePos);

				return FReply::Handled();
			}
		}
	}

	return FReply::Unhandled();
}

int32 FWebBrowserWindow::GetCefMouseModifiers(const FPointerEvent& InMouseEvent)
{
	int32 Modifiers = GetCefInputModifiers(InMouseEvent);

	if (InMouseEvent.IsMouseButtonDown(EKeys::LeftMouseButton))
	{
		Modifiers |= EVENTFLAG_LEFT_MOUSE_BUTTON;
	}
	if (InMouseEvent.IsMouseButtonDown(EKeys::MiddleMouseButton))
	{
		Modifiers |= EVENTFLAG_MIDDLE_MOUSE_BUTTON;
	}
	if (InMouseEvent.IsMouseButtonDown(EKeys::RightMouseButton))
	{
		Modifiers |= EVENTFLAG_RIGHT_MOUSE_BUTTON;
	}

	return Modifiers;
}

FReply STrackNode::OnDragDetected( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )
{
	if (AllowDrag && MouseEvent.IsMouseButtonDown( EKeys::LeftMouseButton ) )
	{
		bBeingDragged = true;

		return BeginDrag( MyGeometry, MouseEvent );
	}
	return FReply::Unhandled();
}

void STrack::OnMouseEnter( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )
{
	if ( MouseEvent.IsMouseButtonDown( EKeys::LeftMouseButton ) )
	{
		UpdateDraggableBarIndex(MyGeometry, MouseEvent.GetScreenSpacePosition());
		if ( DraggableBarIndex != INDEX_NONE )
		{
			bDraggingBar = true;
		}
	}
}

FCursorReply STableViewBase::OnCursorQuery( const FGeometry& MyGeometry, const FPointerEvent& CursorEvent ) const
{
	if ( IsRightClickScrolling() && CursorEvent.IsMouseButtonDown(EKeys::RightMouseButton) )
	{
		// We hide the native cursor as we'll be drawing the software EMouseCursor::GrabHandClosed cursor
		return FCursorReply::Cursor( EMouseCursor::None );
	}
	else
	{
		return FCursorReply::Unhandled();
	}
}

FCursorReply SSequencerTrackArea::OnCursorQuery( const FGeometry& MyGeometry, const FPointerEvent& CursorEvent ) const
{
	if (CursorEvent.IsMouseButtonDown(EKeys::RightMouseButton) && HasMouseCapture())
	{
		return FCursorReply::Cursor(EMouseCursor::GrabHandClosed);
	}

	auto SequencerPin = SequencerWidget.Pin();
	if (SequencerPin.IsValid())
	{
		return SequencerPin->GetEditTool().OnCursorQuery(MyGeometry, CursorEvent);
	}

	return FCursorReply::Unhandled();
}

FReply SAnimTrackPanel::OnMouseMove( const FGeometry& InMyGeometry, const FPointerEvent& InMouseEvent )
{
	const bool bRightMouseButtonDown = InMouseEvent.IsMouseButtonDown(EKeys::RightMouseButton);

	// When mouse moves, if we are moving a key, update its 'input' position
	if(bRightMouseButtonDown)
	{
		if( !bPanning )
		{
			PanningDistance += FMath::Abs(InMouseEvent.GetCursorDelta().X);
			if ( PanningDistance > FSlateApplication::Get().GetDragTriggerDistance() )
			{
				bPanning = true;
				UE_LOG(LogAnimation, Log, TEXT("MouseMove (Capturing Mouse) %d, %0.5f"), bPanning, PanningDistance);
				return FReply::Handled().CaptureMouse(SharedThis(this));
			}
		}
		else
		{
			FTrackScaleInfo ScaleInfo(ViewInputMin.Get(),  ViewInputMax.Get(), 0.f, 0.f, InMyGeometry.Size);
			FVector2D ScreenDelta = InMouseEvent.GetCursorDelta();
			FVector2D InputDelta;
			InputDelta.X = ScreenDelta.X/ScaleInfo.PixelsPerInput;
			InputDelta.Y = -ScreenDelta.Y/ScaleInfo.PixelsPerOutput;

			float NewViewInputMin = ViewInputMin.Get() - InputDelta.X;
			float NewViewInputMax = ViewInputMax.Get() - InputDelta.X;
			// we'd like to keep  the range if outside when panning
			if ( NewViewInputMin < InputMin.Get() )
			{
				NewViewInputMin = InputMin.Get();
				NewViewInputMax = ScaleInfo.ViewInputRange;
			}
			else if ( NewViewInputMax > InputMax.Get() )
			{
				NewViewInputMax = InputMax.Get();
				NewViewInputMin = NewViewInputMax - ScaleInfo.ViewInputRange;
			}

			OnSetInputViewRange.Execute(NewViewInputMin, NewViewInputMax);

			UE_LOG(LogAnimation, Log, TEXT("MouseMove (Panning) %0.2f, %0.2f"), ViewInputMin.Get(), ViewInputMax.Get());
			return FReply::Handled();
		}
	}

	return FReply::Unhandled();
}

FReply SFlipbookKeyframeWidget::OnDragDetected(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent)
{
	if (MouseEvent.IsMouseButtonDown(EKeys::LeftMouseButton))
	{
		UPaperFlipbook* Flipbook = FlipbookBeingEdited.Get();
		if ((Flipbook != nullptr) && Flipbook->IsValidKeyFrameIndex(FrameIndex))
		{
			TSharedRef<FFlipbookKeyFrameDragDropOp> Operation = FFlipbookKeyFrameDragDropOp::New(
				GetFrameWidth().Get(), Flipbook, FrameIndex);

			return FReply::Handled().BeginDragDrop(Operation);
		}
	}

	return FReply::Unhandled();
}

FReply STableViewBase::OnMouseMove( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )
{	
	if( MouseEvent.IsMouseButtonDown( EKeys::RightMouseButton ) )
	{
		const float ScrollByAmount = MouseEvent.GetCursorDelta().Y / MyGeometry.Scale;
		// If scrolling with the right mouse button, we need to remember how much we scrolled.
		// If we did not scroll at all, we will bring up the context menu when the mouse is released.
		AmountScrolledWhileRightMouseDown += FMath::Abs( ScrollByAmount );

		// Has the mouse moved far enough with the right mouse button held down to start capturing
		// the mouse and dragging the view?
		if( IsRightClickScrolling() )
		{
			// Make sure the active timer is registered to update the inertial scroll
			if (!bIsScrollingActiveTimerRegistered)
			{
				bIsScrollingActiveTimerRegistered = true;
				RegisterActiveTimer(0.f, FWidgetActiveTimerDelegate::CreateSP(this, &STableViewBase::UpdateInertialScroll));
			}

			TickScrollDelta -= ScrollByAmount;

			const float AmountScrolled = this->ScrollBy( MyGeometry, -ScrollByAmount, AllowOverscroll );

			FReply Reply = FReply::Handled();

			// The mouse moved enough that we're now dragging the view. Capture the mouse
			// so the user does not have to stay within the bounds of the list while dragging.
			if(this->HasMouseCapture() == false)
			{
				Reply.CaptureMouse( AsShared() ).UseHighPrecisionMouseMovement( AsShared() );
				SoftwareCursorPosition = MyGeometry.AbsoluteToLocal( MouseEvent.GetScreenSpacePosition() );
				bShowSoftwareCursor = true;
			}

			// Check if the mouse has moved.
			if( AmountScrolled != 0 )
			{
				SoftwareCursorPosition.Y += ScrollByAmount;
			}

			return Reply;
		}
	}

	return FReply::Unhandled();
}

FReply SSequencerTrackArea::OnMouseMove( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )
{
	auto SequencerPin = SequencerWidget.Pin();
	if (SequencerPin.IsValid())
	{
		FReply Reply = SequencerPin->GetEditTool().OnMouseMove(*this, MyGeometry, MouseEvent);
		if (Reply.IsEventHandled())
		{
			return Reply;
		}
	}

	if (MouseEvent.IsMouseButtonDown(EKeys::RightMouseButton) && HasMouseCapture())
	{
		TreeView.Pin()->ScrollByDelta( -MouseEvent.GetCursorDelta().Y );
	}

	return TimeSliderController->OnMouseMove( SharedThis(this), MyGeometry, MouseEvent );
}