public override void MouseDragged(NSEvent theEvent)
{
base.MouseDragged(theEvent);
CGPoint down = mMouseDownEvent.LocationInWindow;
CGPoint drag = theEvent.LocationInWindow;
// Calculate the distance between this dragging position and the mouse down position
double distance = Math.Sqrt(Math.Pow(down.X - drag.X, 2) + Math.Pow(down.Y - drag.Y, 2));
// Don't do too often
if (distance < 3)
{
return;
}
// And not if there is no string to drag
if (mLetter.Length == 0)
{
return;
}
// Get the size of the string
CGSize size = mLetter.StringSize(mTextAttributes);
// Create the image that will be dragged
NSImage anImage = new NSImage(size);
// Create a rect in which you will draw the letter
// in the image
CGRect imageBounds = CGRect.Empty;
imageBounds.Location = new CGPoint(0.0f, 0.0f);
imageBounds.Size = size;
// Draw the letter on the image
anImage.LockFocus();
DrawStringCenteredInRectangle(mLetter, imageBounds);
anImage.UnlockFocus();
// Get the location of the mouse down event
CGPoint p = this.ConvertPointFromView(down, null);
// Drag from the center of theimage
p = new CGPoint(p.X - size.Width / 2, p.Y - size.Height / 2);
// Get the pasteboard
NSPasteboard pb = NSPasteboard.FromName(NSPasteboard.NSDragPasteboardName);
// Put the string and the pdf image in the pasteboard
WriteToPasteBoard(pb);
// Start the drag - deprecated, should use BeginDraggingSession, but need to wait for new Xam.Mac. Bug filed. #26941
this.DragImage(anImage, p, CGSize.Empty, mMouseDownEvent, pb, this, true);
}
public void DragStart(TransferDataSource data, DragDropAction dragAction, object image, double xhot, double yhot)
{
var lo = RootWidget.ConvertPointToBase(new PointF(Widget.Bounds.X, Widget.Bounds.Y));
lo = RootWidget.Window.ConvertBaseToScreen(lo);
var ml = NSEvent.CurrentMouseLocation;
var pb = NSPasteboard.FromName(NSPasteboard.NSDragPasteboardName);
if (pb == null)
{
throw new InvalidOperationException("Could not get pasteboard");
}
if (data == null)
{
throw new ArgumentNullException("data");
}
InitPasteboard(pb, data);
var img = (NSImage)image;
var pos = new PointF(ml.X - lo.X - (float)xhot, lo.Y - ml.Y - (float)yhot + img.Size.Height);
Widget.DragImage(img, pos, new SizeF(0, 0), NSApplication.SharedApplication.CurrentEvent, pb, Widget, true);
}
public void DragStart(DragStartData sdata)
{
var lo = Widget.ConvertPointToBase(new PointF(Widget.Bounds.X, Widget.Bounds.Y));
lo = Widget.Window.ConvertBaseToScreen(lo);
var ml = NSEvent.CurrentMouseLocation;
var pb = NSPasteboard.FromName(NSPasteboard.NSDragPasteboardName);
if (pb == null)
{
throw new InvalidOperationException("Could not get pasteboard");
}
if (sdata.Data == null)
{
throw new ArgumentNullException("data");
}
InitPasteboard(pb, sdata.Data);
var img = (NSImage)sdata.ImageBackend;
var pos = new PointF(ml.X - lo.X - (float)sdata.HotX, lo.Y - ml.Y - (float)sdata.HotY + img.Size.Height);
Widget.DragImage(img, pos, new SizeF(0, 0), NSApplication.SharedApplication.CurrentEvent, pb, Widget, true);
}