C++ View::GetMousePoint方法代码示例

int Control::CurAlpha(DisplayDirector* director)
{
	// find out where the mouse is and make sure it's in the window
	View* windowView = director->WindowView();
	BPoint mousePoint = windowView->GetMousePoint();
	if (!windowView->Bounds().BRect::Contains(mousePoint))
		return 0;

	// calculate the alpha
	BRect rect = GetRect();
	int xDistance = 0;
	if (mousePoint.x < rect.left)
		xDistance = (int) (rect.left - mousePoint.x);
	else if (mousePoint.x > rect.right)
		xDistance = (int) (mousePoint.x - rect.right);
	int yDistance = 0;
	if (mousePoint.y < rect.top)
		yDistance = (int) (rect.top - mousePoint.y);
	else if (mousePoint.y > rect.bottom)
		yDistance = (int) (mousePoint.y - rect.bottom);
	float distance = sqrt(xDistance * xDistance + yDistance * yDistance);
	if (distance > visibleZone)
		distance = visibleZone;
	float visibility = (visibleZone - distance) / visibleZone;
	return (int) (visibility * 255);
}

void DisplayDirector::FindSelection()
{
//***	be_app->HideCursor();
	View* view = WindowView();
	BPoint point;
	BPoint lastPoint(-1000000, -1000000);
	bool scrolling = false;
	for (;; lastPoint = point) {
		// get & check mouse state
		int buttons = view->GetMouseButtons();
		if (buttons == 0)
			break;
		point = view->GetMousePoint();
		bool autoscrolling = Autoscroll(point);
		if (point == lastPoint && !autoscrolling && !scrolling) {
			view->MouseTrackingPause();
			continue;
			}

		// move the selection
		StartRefreshCycle();
		BPoint docPoint = ViewToDoc(point);
		FindSelectionContext context(docPoint.x, docPoint.y);
		Selection* newSelection = docDisplayNode->BlockFindSelection(&context);
		SetSelection(newSelection);
		scrolling = DoScrollStep();
		FinishRefreshCycle();
		ClearDeletedSelections();
		}
//***	be_app->ShowCursor();	//*** didn't work
}

void DisplayDirector::ExtendSelection()
{
	if (selection == NULL)
		return;

	View* view = WindowView();
	BPoint lastPoint;
	Selection* rootSelection = selection;
	bool scrolling = false;
	while (true) {
		// get the mouse point and check if moved/finished
		int buttons = view->GetMouseButtons();
		if (buttons == 0)
			break;
		BPoint point = view->GetMousePoint();
		Autoscroll(point);
		point = ViewToDoc(point);
		if (point == lastPoint && !scrolling) {
			view->MouseTrackingPause();
			continue;
			}

		// change the selection
		Selection* newSelection = rootSelection->ExtendTo(point);
		if (newSelection != selection) {
			StartRefreshCycle();
			RefreshSelection();

			if (selection != rootSelection)
				delete selection;
			selection = newSelection;

			scrolling = DoScrollStep();

			RefreshSelection();
			FinishRefreshCycle();
			}

		lastPoint = point;
		}

	// clean up root selection
	if (selection != rootSelection)
		delete rootSelection;
}

void DisplayDirector::DragSelection(BPoint startPoint)
{
	if (selection == NULL)
		return;

	View* view = WindowView();
	BPoint lastPoint = ViewToDoc(startPoint);
	bool scrolling = false;
	bool wasRightButton = false;
	bool optionDown = false;
	while (true) {
		// get the mouse point and check if moved/finished
		BPoint point = view->GetMousePoint();
		int buttons = view->GetMouseButtons();
		if (buttons == 0)
			break;
		wasRightButton = ((buttons & (B_SECONDARY_MOUSE_BUTTON | B_TERTIARY_MOUSE_BUTTON)) != 0);
		optionDown = ((view->CurModifiers() & B_OPTION_KEY) != 0);
		scrolling |= Autoscroll(point);
		point = ViewToDoc(point);
		if (point == lastPoint && !scrolling) {
			view->MouseTrackingPause();
			continue;
			}

		// change the destination
		Destination* newDestination = NULL;
		if (!selection->ContainsPoint(point)) {
			FindDestinationContext destContext(selection, point.x, point.y);
			newDestination = docDisplayNode->BlockFindDestination(&destContext);
			}
		if (newDestination != destination) {
			StartRefreshCycle();

			SetDestination(newDestination);

			scrolling = DoScrollStep();

			FinishRefreshCycle();
			}
		else
			scrolling = DoScrollStep();

		lastPoint = point;
		}

	// do the move/copy
	if (destination) {
		// figure out if it's a move or a copy
		bool doing = true;
		bool copying = false;
/***
		if (wasRightButton) {
			BPopUpMenu* menu = new BPopUpMenu("Move/Copy");
			BMenuItem* moveItem = new BMenuItem("Move", NULL);
			menu->AddItem(moveItem);
			BMenuItem* copyItem = new BMenuItem("Copy", NULL);
			menu->AddItem(copyItem);
			BMenuItem* chosenItem = menu->Go(ConvertToScreen(DocToView(lastPoint)), false, true);
			copying = (chosenItem == copyItem);
			if (chosenItem == NULL)
				doing = false;
			delete menu;
			}
		else if (optionDown)
			copying = true;
***/
		if (optionDown)
			copying = true;

		if (doing) {
			StartRefreshCycle();

			// do the move or copy
			Action* moveAction = NULL;
			if (copying)
				moveAction = destination->GetCopyAction();
			else
				moveAction = destination->GetMoveAction();
			if (moveAction)
				DoAction(moveAction);

			SetDestination(NULL);

			FinishRefreshCycle();
			}
		else
			SetDestination(NULL);
		}
}