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

FReply FScrollyZoomy::OnMouseMove( const TSharedRef<SWidget> MyWidget, IScrollableZoomable& ScrollableZoomable, const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )
{
	if (MouseEvent.IsMouseButtonDown(EKeys::RightMouseButton))
	{
		// 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( MouseEvent.GetCursorDelta().X ) + FMath::Abs( MouseEvent.GetCursorDelta().Y );

		// Has the mouse moved far enough with the right mouse button held down to start capturing
		// the mouse and dragging the view?
		if (IsRightClickScrolling())
		{
			this->HorizontalIntertia.AddScrollSample( MouseEvent.GetCursorDelta().X, FPlatformTime::Seconds() );
			this->VerticalIntertia.AddScrollSample( MouseEvent.GetCursorDelta().Y, FPlatformTime::Seconds() );
			const bool DidScroll = ScrollableZoomable.ScrollBy( MouseEvent.GetCursorDelta() );

			FReply Reply = FReply::Handled();

			// Capture the mouse if we need to
			if (MyWidget->HasMouseCapture() == false)
			{
				Reply.CaptureMouse( MyWidget ).UseHighPrecisionMouseMovement( MyWidget );
				SoftwareCursorPosition = MyGeometry.AbsoluteToLocal( MouseEvent.GetScreenSpacePosition() );
				bShowSoftwareCursor = true;
			}

			// Check if the mouse has moved.
			if (DidScroll)
			{
				SoftwareCursorPosition += MouseEvent.GetCursorDelta();
			}

			return Reply;
		}
	}

	return FReply::Unhandled();
}

FReply SSection::OnMouseButtonUp( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )
{
	if( bDragging && DragOperation.IsValid() )
	{
		// If dragging tell the operation we are no longer dragging
		DragOperation->OnEndDrag(ParentSectionArea);
	}
	else
	{
		if( ( MouseEvent.GetEffectingButton() == EKeys::LeftMouseButton || MouseEvent.GetEffectingButton() == EKeys::RightMouseButton ) && HasMouseCapture() && MyGeometry.IsUnderLocation( MouseEvent.GetScreenSpacePosition() ) )
		{
			HandleSelection( MyGeometry, MouseEvent );
		}

		if( MouseEvent.GetEffectingButton() == EKeys::RightMouseButton && HasMouseCapture() )
		{
			TSharedPtr<SWidget> MenuContent = OnSummonContextMenu( MyGeometry, MouseEvent );
			if (MenuContent.IsValid())
			{
				FWidgetPath WidgetPath = MouseEvent.GetEventPath() != nullptr ? *MouseEvent.GetEventPath() : FWidgetPath();

				FSlateApplication::Get().PushMenu(
					AsShared(),
					WidgetPath,
					MenuContent.ToSharedRef(),
					MouseEvent.GetScreenSpacePosition(),
					FPopupTransitionEffect( FPopupTransitionEffect::ContextMenu )
					);

				return FReply::Handled().ReleaseMouseCapture().SetUserFocus(MenuContent.ToSharedRef(), EFocusCause::SetDirectly);
			}
		}
	}

	ResetState();

	return FReply::Handled().ReleaseMouseCapture();
}

TSharedPtr<SWidget> STrack::SummonContextMenu(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent)
{
	bool SummonedContextMenu = false;

	const bool bCloseWindowAfterMenuSelection = true;
	FMenuBuilder MenuBuilder( bCloseWindowAfterMenuSelection, EditorActions );

	FVector2D CursorPos = MouseEvent.GetScreenSpacePosition();
	float DataPos = LocalToDataX( MyGeometry.AbsoluteToLocal(CursorPos).X, MyGeometry );

	// Context menu for a node
	int NotifyIndex = GetHitNode(MyGeometry, MyGeometry.AbsoluteToLocal(CursorPos));
	if(NotifyIndex != INDEX_NONE)
	{
		if(TrackNodes[NotifyIndex]->OnNodeRightClickContextMenu.IsBound())
		{
			TrackNodes[NotifyIndex]->OnNodeRightClickContextMenu.Execute(MenuBuilder);
			SummonedContextMenu = true;
		}
	}

	// Context menu for track itself
	if(OnTrackRightClickContextMenu.IsBound())
	{
		SummonedContextMenu = true;
		OnTrackRightClickContextMenu.Execute(MenuBuilder, DataPos, DraggableBarIndex);
	}

	// Build the menu if we actually added anything to it
	TSharedPtr<SWindow> ContextMenuWindow = NULL;
	if(SummonedContextMenu)
	{
		ContextMenuWindow =
			FSlateApplication::Get().PushMenu( SharedThis( this ), MenuBuilder.MakeWidget(), CursorPos, FPopupTransitionEffect( FPopupTransitionEffect::ContextMenu ));
	}

	return ContextMenuWindow;
}

FReply FSceneViewport::OnTouchMoved( const FGeometry& MyGeometry, const FPointerEvent& TouchEvent )
{
	// Start a new reply state
	CurrentReplyState = FReply::Handled(); 

	UpdateCachedMousePos(MyGeometry, TouchEvent);
	UpdateCachedGeometry(MyGeometry);

	if( ViewportClient )
	{
		// Switch to the viewport clients world before processing input
		FScopedConditionalWorldSwitcher WorldSwitcher( ViewportClient );

		const FVector2D TouchPosition = MyGeometry.AbsoluteToLocal(TouchEvent.GetScreenSpacePosition());

		if( !ViewportClient->InputTouch( this, TouchEvent.GetUserIndex(), TouchEvent.GetPointerIndex(), ETouchType::Moved, TouchPosition, FDateTime::Now(), TouchEvent.GetTouchpadIndex()) )
		{
			CurrentReplyState = FReply::Unhandled(); 
		}
	}

	return CurrentReplyState;
}

TSharedPtr<SWidget> SSection::OnSummonContextMenu( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )
{
	FSelectedKey Key = GetKeyUnderMouse( MouseEvent.GetScreenSpacePosition(), MyGeometry );

	FSequencer& Sequencer = GetSequencer();

	UMovieSceneSection* SceneSection = SectionInterface->GetSectionObject();

	// @todo sequencer replace with UI Commands instead of faking it
	const bool bShouldCloseWindowAfterMenuSelection = true;
	FMenuBuilder MenuBuilder(bShouldCloseWindowAfterMenuSelection, NULL);

	if (Key.IsValid())
	{
		MenuBuilder.AddMenuEntry(
			NSLOCTEXT("Sequencer", "DeleteKey", "Delete"),
			NSLOCTEXT("Sequencer", "DeleteKeyToolTip", "Deletes the selected keys."),
			FSlateIcon(),
			FUIAction(FExecuteAction::CreateSP(&Sequencer, &FSequencer::DeleteSelectedKeys))
			);
	}
	else
	{
		SectionInterface->BuildSectionContextMenu(MenuBuilder);

		// @todo Sequencer this should delete all selected sections
		// delete/selection needs to be rethought in general
		MenuBuilder.AddMenuEntry(
			NSLOCTEXT("Sequencer", "DeleteSection", "Delete"),
			NSLOCTEXT("Sequencer", "DeleteSectionToolTip", "Deletes this section."),
			FSlateIcon(),
			FUIAction(FExecuteAction::CreateSP(&Sequencer, &FSequencer::DeleteSection, SceneSection))
			);
	}
	
	return MenuBuilder.MakeWidget();
}

FReply SProfilerThreadView::OnMouseButtonDown( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )
{
	FReply Reply = FReply::Unhandled();

	if( IsReady() )
	{
		MousePositionOnButtonDown = MyGeometry.AbsoluteToLocal( MouseEvent.GetScreenSpacePosition() );

		if( MouseEvent.GetEffectingButton() == EKeys::LeftMouseButton )
		{
			bIsLeftMousePressed = true;
			DistanceDragged = PositionXMS;

			// Capture mouse, so we can move outside this widget.
			Reply = FReply::Handled().CaptureMouse( SharedThis( this ) );
		}
		else if( MouseEvent.GetEffectingButton() == EKeys::RightMouseButton )
		{
			bIsRightMousePressed = true;
		}
	}

	return Reply;
}

void STableViewBase::OnRightMouseButtonUp(const FPointerEvent& MouseEvent)
{
	const FVector2D& SummonLocation = MouseEvent.GetScreenSpacePosition();
	const bool bShouldOpenContextMenu = !IsRightClickScrolling();
	const bool bContextMenuOpeningBound = OnContextMenuOpening.IsBound();

	if ( bShouldOpenContextMenu && bContextMenuOpeningBound )
	{
		// Get the context menu content. If NULL, don't open a menu.
		TSharedPtr<SWidget> MenuContent = OnContextMenuOpening.Execute();

		if( MenuContent.IsValid() )
		{
			bShowSoftwareCursor = false;

			FWidgetPath WidgetPath = MouseEvent.GetEventPath() != nullptr ? *MouseEvent.GetEventPath() : FWidgetPath();
			FSlateApplication::Get().PushMenu(AsShared(), WidgetPath, MenuContent.ToSharedRef(), SummonLocation, FPopupTransitionEffect(FPopupTransitionEffect::ContextMenu));


		}
	}

	AmountScrolledWhileRightMouseDown = 0;
}

FReply SVirtualJoystick::OnTouchMoved(const FGeometry& MyGeometry, const FPointerEvent& Event)
{
	FVector2D LocalCoord = MyGeometry.AbsoluteToLocal( Event.GetScreenSpacePosition() );

	for (int32 ControlIndex = 0; ControlIndex < Controls.Num(); ControlIndex++)
	{
		FControlInfo& Control = Controls[ControlIndex];

		// is this control the one captured to this pointer?
		if (Control.CapturedPointerIndex == Event.GetPointerIndex())
		{
			if (Control.bNeedUpdatedCenter)
			{
				return FReply::Unhandled();
			}
			else if (HandleTouch(ControlIndex, LocalCoord, MyGeometry.Size))
			{
				return FReply::Handled();
			}
		}
	}

	return FReply::Unhandled();
}

bool SColorWheel::ProcessMouseAction(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent, bool bProcessWhenOutsideColorWheel)
{
	const FVector2D LocalMouseCoordinate = MyGeometry.AbsoluteToLocal(MouseEvent.GetScreenSpacePosition());
	const FVector2D Location = LocalMouseCoordinate / (MyGeometry.Size * 0.5f) - FVector2D(1.0f, 1.0f);
	const float Radius = Location.Size();

	if (Radius <= 1.0f || bProcessWhenOutsideColorWheel)
	{
		float Angle = FMath::Atan2(Location.Y, Location.X);

		if (Angle < 0.0f)
		{
			Angle += 2.0f * PI;
		}

		FLinearColor NewColor = SelectedColor.Get();
		NewColor.R = Angle * 180.0f * INV_PI;
		NewColor.G = FMath::Min(Radius, 1.0f);

		OnValueChanged.ExecuteIfBound(NewColor);
	}

	return (Radius <= 1.0f);
}

FReply SProfilerThreadView::OnMouseMove( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )
{
	//	SCOPE_LOG_TIME_FUNC();

	FReply Reply = FReply::Unhandled();

	if( IsReady() )
	{
		const FVector2D LocalMousePosition = MyGeometry.AbsoluteToLocal( MouseEvent.GetScreenSpacePosition() );
		
		HoveredPositionX = 0.0;//PositionToFrameIndex( LocalMousePosition.X );
		HoveredPositionY = 0.0;

		const float CursorPosXDelta = -MouseEvent.GetCursorDelta().X;
		const float ScrollSpeed = 1.0f / ZoomFactorX;

		if( MouseEvent.IsMouseButtonDown( EKeys::LeftMouseButton ) )
		{
			if( HasMouseCapture() && !MouseEvent.GetCursorDelta().IsZero() )
			{
				DistanceDragged += CursorPosXDelta*ScrollSpeed*0.1;

				// Inform other widgets that we have scrolled the thread-view.
				SetPositionX( FMath::Clamp( DistanceDragged, 0.0, TotalRangeXMS - RangeXMS ) );
				CursorType = EThreadViewCursor::Hand;
				Reply = FReply::Handled();
			}
		}
		else
		{
			CursorType = EThreadViewCursor::Default;
		}
	}

	return Reply;
}

int32 SWidget::FindChildUnderMouse( const FArrangedChildren& Children, const FPointerEvent& MouseEvent )
{
	const FVector2D& AbsoluteCursorLocation = MouseEvent.GetScreenSpacePosition();
	return SWidget::FindChildUnderPosition( Children, AbsoluteCursorLocation );
}

	virtual FReply OnMouseMove(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent) override
	{
		struct FWidgetPicker
		{
			static bool FindWidgetsUnderPoint(const FVector2D& InHitTestPoint, const FVector2D& InWindowPosition, const TSharedRef<FWidgetReflectorNodeBase>& InWidget, TArray<TSharedRef<FWidgetReflectorNodeBase>>& OutWidgets)
			{
				const bool bNeedsHitTesting = InWidget->GetHitTestInfo().IsHitTestVisible || InWidget->GetHitTestInfo().AreChildrenHitTestVisible;
				if (bNeedsHitTesting)
				{
					const FSlateRect HitTestRect = FSlateRect::FromPointAndExtent(
						InWidget->GetAccumulatedLayoutTransform().GetTranslation() - InWindowPosition, 
						TransformPoint(InWidget->GetAccumulatedLayoutTransform().GetScale(), InWidget->GetLocalSize())
						);

					if (HitTestRect.ContainsPoint(InHitTestPoint))
					{
						OutWidgets.Add(InWidget);

						if (InWidget->GetHitTestInfo().AreChildrenHitTestVisible)
						{
							for (const auto& ChildWidget : InWidget->GetChildNodes())
							{
								if (FindWidgetsUnderPoint(InHitTestPoint, InWindowPosition, ChildWidget, OutWidgets))
								{
									return true;
								}
							}
						}

						return InWidget->GetHitTestInfo().IsHitTestVisible;
					}
				}

				return false;
			}
		};

		if (bIsPicking)
		{
			// We need to pick in the snapshot window space, so convert the mouse co-ordinates to be relative to our top-left position
			const FVector2D& ScreenMousePos = MouseEvent.GetScreenSpacePosition();
			const FVector2D LocalMousePos = MyGeometry.AbsoluteToLocal(ScreenMousePos);
			const FVector2D ScrolledPos = LocalMousePos - PhysicalOffset;

			PickedWidgets.Reset();

			TSharedPtr<FWidgetReflectorNodeBase> Window = SnapshotDataPtr->GetWindow(SelectedWindowIndex);
			if (Window.IsValid())
			{
				FWidgetPicker::FindWidgetsUnderPoint(
					ScrolledPos, 
					Window->GetAccumulatedLayoutTransform().GetTranslation(), 
					Window.ToSharedRef(), 
					PickedWidgets
					);
			}

			if (PickedWidgets.Num() > 0)
			{
				OnWidgetPathPicked.ExecuteIfBound(PickedWidgets);
			}
		}

		return ScrollyZoomy.OnMouseMove(AsShared(), *this, MyGeometry, MouseEvent);
	}

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

	if( TextEditor->IsDragSelecting() && TextEditor->GetWidget()->HasMouseCapture() && InMouseEvent.GetCursorDelta() != FVector2D::ZeroVector )
	{
		TextEditor->MoveCursor( FMoveCursor::ViaScreenPointer( InMyGeometry.AbsoluteToLocal( InMouseEvent.GetScreenSpacePosition( ) ), InMyGeometry.Scale, ECursorAction::SelectText ) );
		TextEditor->SetHasDragSelectedSinceFocused( true );
		Reply = FReply::Handled();
	}

	return Reply;
}

void FSceneViewport::UpdateCachedMousePos( const FGeometry& InGeometry, const FPointerEvent& InMouseEvent )
{
	CachedMousePos = InGeometry.AbsoluteToLocal( InMouseEvent.GetScreenSpacePosition() ).IntPoint();
}

FReply FSceneViewport::OnMouseButtonDown( const FGeometry& InGeometry, const FPointerEvent& InMouseEvent )
{
	// Start a new reply state
	// Prevent throttling when interacting with the viewport so we can move around in it
	CurrentReplyState = FReply::Handled().PreventThrottling();

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

	// Switch to the viewport clients world before processing input
	FScopedConditionalWorldSwitcher WorldSwitcher( ViewportClient );
	if( ViewportClient && GetSizeXY() != FIntPoint::ZeroValue )
	{
		// If we're obtaining focus, we have to copy the modifier key states prior to processing this mouse button event, as this is the only point at which the mouse down
		// event is processed when focus initially changes and the modifier keys need to be in-place to detect any unique drag-like events.
		if ( !HasFocus() )
		{
			FModifierKeysState KeysState = FSlateApplication::Get().GetModifierKeys();
			ApplyModifierKeys( KeysState );
		}

		const bool bAnyMenuWasVisible = FSlateApplication::Get().AnyMenusVisible();

		// Process the mouse event
		if (!ViewportClient->InputKey(this, InMouseEvent.GetUserIndex(), InMouseEvent.GetEffectingButton(), IE_Pressed))
		{
			CurrentReplyState = FReply::Unhandled(); 
		}

		// a new menu was opened if there was previously not a menu visible but now there is
		const bool bNewMenuWasOpened = !bAnyMenuWasVisible && FSlateApplication::Get().AnyMenusVisible();

		if (!ViewportClient->IgnoreInput() &&
			!bNewMenuWasOpened && // We should not focus the viewport if a menu was opened as it would close the menu
			( ViewportClient->CaptureMouseOnClick() == EMouseCaptureMode::CapturePermanently ||
			  ViewportClient->CaptureMouseOnClick() == EMouseCaptureMode::CaptureDuringMouseDown ||
			  ( ViewportClient->CaptureMouseOnClick() == EMouseCaptureMode::CaptureDuringRightMouseDown && InMouseEvent.GetEffectingButton() == EKeys::RightMouseButton ) ) )
		{
			TSharedRef<SViewport> ViewportWidgetRef = ViewportWidget.Pin().ToSharedRef();

			// Mouse down should focus viewport for user input
			CurrentReplyState.SetUserFocus(ViewportWidgetRef, EFocusCause::SetDirectly, true);
			
			UWorld* World = ViewportClient->GetWorld();
			if (World && World->IsGameWorld() && World->GetFirstPlayerController())
			{
				CurrentReplyState.CaptureMouse(ViewportWidgetRef);
				CurrentReplyState.LockMouseToWidget(ViewportWidgetRef);

				bool bShouldShowMouseCursor = World->GetFirstPlayerController()->ShouldShowMouseCursor();
				if (ViewportClient->HideCursorDuringCapture() && bShouldShowMouseCursor)
				{
					bCursorHiddenDueToCapture = true;
					MousePosBeforeHiddenDueToCapture = FIntPoint( InMouseEvent.GetScreenSpacePosition().X, InMouseEvent.GetScreenSpacePosition().Y );
				}
				if (bCursorHiddenDueToCapture || !bShouldShowMouseCursor)
				{
					CurrentReplyState.UseHighPrecisionMouseMovement(ViewportWidgetRef);
				}
			}
			else
			{
				CurrentReplyState.UseHighPrecisionMouseMovement(ViewportWidgetRef);
			}
		}
	}
	
	// Re-set prevent throttling here as it can get reset when inside of InputKey()
	CurrentReplyState.PreventThrottling();

	return CurrentReplyState;
}