Пример #1
0
        public override void MouseDown(NSEvent theEvent)
        {
            ColorRect   oldSelectedItem = selectedItem;
            ColorRect   thisRect;
            PointF      mouseLoc    = PointF.Empty;
            PointF      mouseOffset = PointF.Empty;
            NSEventMask eventMask;
            bool        dragged = false;
            bool        timerOn = false;

            NSEvent autoScrollEvent = null;

            selectedItem = null;

            if (!Window.MakeFirstResponder(this))
            {
                return;
            }

            mouseLoc = ConvertPointFromView(theEvent.LocationInWindow, null);

            // we go from last to first
            for (int x = rects.Count - 1; x >= 0; x--)
            {
                thisRect = rects[x];

                if (IsMouseInRect(mouseLoc, thisRect.Frame))
                {
                    selectedItem = thisRect;
                    break;
                }
            }

            if (oldSelectedItem != selectedItem)
            {
                if (oldSelectedItem != null)
                {
                    SetNeedsDisplayInRect(oldSelectedItem.Frame);
                }
                if (selectedItem != null)
                {
                    SetNeedsDisplayInRect(selectedItem.Frame);
                }

                updateRulers();
            }

            if (selectedItem == null || selectedItem.IsLocked)
            {
                return;
            }

            mouseOffset.X = mouseLoc.X - selectedItem.Frame.Location.X;
            mouseOffset.Y = mouseLoc.Y - selectedItem.Frame.Location.Y;

            eventMask = NSEventMask.LeftMouseDragged | NSEventMask.LeftMouseUp
                        | NSEventMask.Periodic;

            while (theEvent != null)
            {
                RectangleF visibleRect = VisibleRect();

                switch (theEvent.Type)
                {
                case NSEventType.Periodic:
                    if (autoScrollEvent != null)
                    {
                        Autoscroll(autoScrollEvent);
                    }
                    moveSelectedItemWithEvent(autoScrollEvent, mouseOffset);
                    break;

                case NSEventType.LeftMouseDragged:
                    if (!dragged)
                    {
                        drawRulerLinesWithRect(selectedItem.Frame);
                    }

                    dragged  = true;
                    mouseLoc = ConvertPointFromView(theEvent.LocationInWindow, null);

                    moveSelectedItemWithEvent(theEvent, mouseOffset);

                    if (!IsMouseInRect(mouseLoc, visibleRect))
                    {
                        if (!timerOn)
                        {
                            NSEvent.StartPeriodicEventsAfterDelay(0.1, 0.1);
                            timerOn = true;
                        }

                        autoScrollEvent = theEvent;
                        break;
                    }
                    else
                    {
                        if (timerOn)
                        {
                            NSEvent.StopPeriodicEvents();
                            timerOn         = false;
                            autoScrollEvent = null;
                        }
                    }
                    DisplayIfNeeded();
                    break;

                case NSEventType.LeftMouseUp:
                    if (timerOn)
                    {
                        NSEvent.StopPeriodicEvents();
                        timerOn         = false;
                        autoScrollEvent = null;
                    }
                    if (dragged)
                    {
                        eraseRulerLinesWithRect(selectedItem.Frame);
                    }
                    updateRulers();
                    return;

                default:
                    break;
                }

                theEvent = this.Window.NextEventMatchingMask(eventMask);
            }
        }