Mouse behavior of ToolStripMenuItems

[Guest]

I've noticed that if you click on a Windows.Forms.ToolStripButton then a
MouseLeave event will not occur until the button is released.
ToolStripMenuItems on the other hand will raise a MouseLeave event as soon as
the mouse moves outside of the item, even if the mouse button is held down.

You can observe this behavior using the following sample:

Public Class Form1
Inherits Windows.Forms.Form
Public Sub New()
Dim item1 As New Windows.Forms.ToolStripMenuItem("Item")
Dim item2 As New Windows.Forms.ToolStripButton("Button")
Dim ts As New Windows.Forms.ToolStrip
ts.Items.AddRange(New Windows.Forms.ToolStripItem() {item1, item2})
Me.Controls.Add(ts)
End Sub
End Class

I understand that this behavior is normally desirable and that in most cases
you would just use a ToolStripButton, but I have a situation where is would
be very helpful to have a ToolStripMenuItem behave like a ToolStripButton in
regards to the mouse. Is there any way to do this?

Thanks for any help!
Lance

 

[Linda Liu [MSFT]]

Hi Lance,

I performed a test based on your sample code, but I saw the MouseLeave
event of the ToolStripButton was fired as soon as the mouse moved outside
of the item, even if the mouse button was held down.

I saw the same thing on ToolStripMenuItem.

I have tried to prevent the MouseLeave event of ToolStripButton or
ToolStripMenuItem from being fired when the left mouse button is held down.
I derive the ToolStripButton and override the OnMouseLeave method. I
thought I could prevent the MouseLeave event of the derived ToolStripButton
from occurring by not calling the statement 'MyBase.OnMouseLeave(e)' in the
override OnMouseLeave method. Unfortunately, I found that this could not
prevent the event from occurring.

It seems that it's the ToolStrip that fires the MouseLeave event for each
item in it.

Could you please tell me why you'd like the behavior of preventing the
MouseLeave event from occurring when the left mouse button is held down?
Maybe there's another way to accomplish what you want.


Sincerely,
Linda Liu
Microsoft Online Community Support

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