Hi Doc,
I agree with Peter that the reason of your problem is that in the MouseDown
event you are using the coordinates passed in the event args, while in the
MouseMove event, you are using coordinates obtained from the
Control.MousePosition property.
You should use the coordinates passed in the MouseMove event args as well.
The following is a sample.
Point downPoint = Point.Empty;
void MainForm_MouseDown(object sender, MouseEventArgs e) {
if( e.Button != MouseButtons.Left ) return;
downPoint = new Point(e.X, e.Y);
}
void MainForm_MouseMove(object sender, MouseEventArgs e) {
if( downPoint == Point.Empty ) return;
Point location =
new Point(
this.Left + e.X - downPoint.X,
this.Top + e.Y - downPoint.Y);
this.Location = location;
}
void MainForm_MouseUp(object sender, MouseEventArgs e) {
if( e.Button != MouseButtons.Left ) return;
downPoint = Point.Empty;
}
Hope this helps.
If you have any question, please feel free to let me know.
Sincerely,
Linda Liu
Microsoft Online Community Support
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