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);
}
}
