Events and Drag-Drop

ChrisM

Hi,
I have searched the forum and documentation, but I don't sem to be able to find any information on mouse events and drag-drop.

Are standard mouse events such as MouseEnter fired?
Are drag/drop events such as OnDragDrop fired ?

VS.net (2005) lets me add handlers for them in the GUI, but then when I try to view the form (actually a user control in this case) in VS.Net, it pukes with an error saying "The type 'WPDynamic.WPDLLInt' has no event named 'MouseEnter'" This certainly appears to be accurate since I cant find the event in the object browser or Reflector. When I use AddHandler the target method never fires.

If these events aren't fired (especially the drag drop) are there any known workarounds? I could always trap the event manually by using non-CLR/PInvoke code, but that seems like a pain

Thanks,
Chris Moses

support

Hi,

the following standard events are not available

Code

"Paint",
"DragDrop",
"DragEnter",
"DragLeave",
"DragOver",
"GiveFeedback",
"QueryContinueDrag",
"Validated",
"Validating",
"ChangeUICues",
"MovesHover",
"MouseEnter",
"MouseLeave",
"BackColorChanged",
"BackgroundImageChanged",
"ContextMenuChanged",
"CursorChanged",
"FontChanged",
"ForeColorChanged",
"ImeModeChanged",
"HelpRequested",
"StyleChanged",
"RightToLeftChanged"

Alles anzeigen

They are removed using a ControlDesigner - I wonder why VS2005 displayes them.

The following mouse events are published instead:

OnMouseMove
OnMouseDown
OnMouseUp
OnDoubleClick

they receive a MouseEventArgs which can be casted to wpMouseEventArgs. wpMouseEventArgs contains the additional property Editor (the number of the editor) and Shift, a bitfield for the shift state which was missing in the original MouseEventArgs.

I wanted to implement .NET drag&drop but I haven't yet developed the concept fully.

Julian Ziersch

support

Hi,

I am a bit surprised. I had removed the drag events because I thought they were not ready, but using this example code dragging items from a string list into the editor works (adapted from an articel on codeproject)

Code

private void listBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
	// Switch on Drop for the editor
	wpdllInt1.AllowDrop = true;


	// Drag from this listbox
	if(listBox1.Items.Count==0) return;


	int index = listBox1.IndexFromPoint(e.X,e.Y);
	string s = listBox1.Items[index].ToString();
	DragDropEffects dde1=DoDragDrop(s,
					DragDropEffects.All);


	if(dde1 == DragDropEffects.All )
	{				listBox1.Items.RemoveAt(listBox1.IndexFromPoint(e.X,e.Y));
	}
}

private void wpdllInt1_DragOver(object sender, System.Windows.Forms.DragEventArgs e)
{
          // The editor accepts the drag
          e.Effect=DragDropEffects.All;
}


private void wpdllInt1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
{
            // Data was dropped
            if(e.Data.GetDataPresent(DataFormats.StringFormat))
            {
	string str= (string)e.Data.GetData(
						DataFormats.StringFormat);


				wpdllInt1.TextCursor.InputString(str,0);
				wpdllInt1.CurrMemo.ReformatAll(false,true);
            }
}

Alles anzeigen

Dragging text from the editor to the listbox does not work ok since the internal drawg&drop support interferes (it is not possible to use MouseDown to start the Drag operation)

Julian