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Normal Topic Mouse cursor plus sign overlay (Read 1816 times)
Joel D.
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Mouse cursor plus sign overlay
Feb 20th, 2020 at 6:57pm
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Is there a way to get the standard plus sign (+) that shows up during a drag-and-drop operation (like with DragDropEffects.Copy) to show up when I press the [Ctrl] key while creating a new link?
« Last Edit: Feb 20th, 2020 at 9:40pm by Joel D. »  
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Slavcho
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Re: Mouse cursor plus sign overlay
Reply #1 - Feb 21st, 2020 at 8:26am
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Try this -

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diagram.KeyDown += (ss, ee) => UpdateCursor();
diagram.KeyUp += (ss, ee) => UpdateCursor();
diagram.MouseMove += (ss, ee) => UpdateCursor();

void UpdateCursor()
{
	bool drawingLink =
		diagram.Interaction != null &&
		diagram.Interaction.CurrentItem is DiagramLink;
	bool ctrlKey =
		(Keyboard.Modifiers & ModifierKeys.Control) != 0;

	diagram.OverrideCursor =
		drawingLink && ctrlKey ?
			System.Windows.Input.Cursors.Cross : null;

	if (diagram.OverrideCursor == null)
	{
		// force repaint the default Cursor before mouse moves
		diagram.OverrideCursor = diagram.OverrideCursor;
	}
}


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Slavcho
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Joel D.
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Re: Mouse cursor plus sign overlay
Reply #2 - Feb 21st, 2020 at 10:08pm
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Thanks.  The setting of diagram.OverrideCursor to diagram.OverrideCursor fixes the issue that I saw where it wouldn't switch back to the the main Cursor until a mouse move.

The problem with this method, though, is that even though OverrideCursor is being set to null, I'm losing my other Cursor changes, such as when drawing a selection, the No cursor is supposed to show unless the selection is over valid objects, or when drawing a link, now the Hand cursor always shows up instead of the No cursor when the Link is over blank space or if the LinkCreating event handler sets e.Cancel to true.  I can see with debug prints that the OverrideCursor is null, but the main Cursor doesn't seem to be changing to what the Diagram was previously telling it to.
  
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Slavcho
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Re: Mouse cursor plus sign overlay
Reply #3 - Feb 28th, 2020 at 4:31pm
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Try this -
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void UpdateCursor()
{
	var baseCursor = diagram.Cursor;

	bool drawingLink =
		diagram.Interaction != null &&
		diagram.Interaction.CurrentItem is DiagramLink;
	bool ctrlKey =
		(Keyboard.Modifiers & ModifierKeys.Control) != 0;

	if (drawingLink && ctrlKey)
	{
		diagram.OverrideCursor = Cursors.Cross;
	}
	else if (diagram.OverrideCursor != null)
	{
		diagram.OverrideCursor = null;
		diagram.Cursor = baseCursor;
	}
}
  
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Joel D.
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Re: Mouse cursor plus sign overlay
Reply #4 - Mar 5th, 2020 at 12:10am
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Smiley
Thanks!
  
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