private void Desktop_ShowElementMenu(object sender, AcceptElementLocationEventArgs e)
{
NodeItem item = e.Element as NodeItem;
if (item != null)
{
MyNodeView nodeView = item.Node as MyNodeView;
if (nodeView != null)
{
MyNode node = nodeView.Node;
openEditorToolStripMenuItem.Enabled = node is IScriptableNode;
openGroupToolStripMenuItem.Enabled = node is MyNodeGroup;
nodeContextMenuStrip.Tag = node;
nodeContextMenuStrip.Show(e.Position);
}
}
}
protected override void OnMouseClick(MouseEventArgs e)
{
try
{
ignoreDoubleClick = false;
if (mouseMoved)
return;
var points = new Point[] { LastLocation };
inverse_transformation.TransformPoints(points);
var transformed_location = points[0];
if (e.Button == MouseButtons.Right)
{
if (null != ShowElementMenu)
{
// See if we clicked on an element and give our owner the chance to show a menu
var result = FindElementAt(transformed_location, delegate(IElement el)
{
// Fire the event and see if someone cancels it.
var eventArgs = new AcceptElementLocationEventArgs(el, this.PointToScreen(LastLocation));
// Give our owner the chance to show a menu for this element ...
ShowElementMenu(this, eventArgs);
// If the owner declines (cancel == true) then we'll continue looking up the hierarchy ..
return !eventArgs.Cancel;
});
// If we haven't found anything to click on we'll just return the event with a null pointer ..
// allowing our owner to show a generic menu
if (result == null)
{
var eventArgs = new AcceptElementLocationEventArgs(null, this.PointToScreen(LastLocation));
ShowElementMenu(this, eventArgs);
}
return;
}
}
var element = FindElementAt(transformed_location);
if (element == null)
{
ignoreDoubleClick = true; // to avoid double-click from firing
if (ModifierKeys == Keys.None)
FocusElement = null;
return;
}
switch (element.ElementType)
{
case ElementType.NodeItem:
{
if (ModifierKeys != Keys.None)
return;
var item = element as NodeItem;
if (item.OnClick())
{
ignoreDoubleClick = true; // to avoid double-click from firing
this.Refresh();
return;
}
break;
}
}
}
finally
{
base.OnMouseClick(e);
}
}
void OnShowElementMenu(object sender, AcceptElementLocationEventArgs e)
{
if (e.Element == null)
{
// Show a test menu for when you click on nothing
testMenuItem.Text = "(clicked on nothing)";
nodeMenu.Show(e.Position);
e.Cancel = false;
} else
if (e.Element is Node)
{
// Show a test menu for a node
testMenuItem.Text = ((Node)e.Element).Title;
nodeMenu.Show(e.Position);
e.Cancel = false;
} else
if (e.Element is NodeItem)
{
// Show a test menu for a nodeItem
testMenuItem.Text = e.Element.GetType().Name;
nodeMenu.Show(e.Position);
e.Cancel = false;
} else
{
// if you don't want to show a menu for this item (but perhaps show a menu for something more higher up)
// then you can cancel the event
e.Cancel = true;
}
}