internal void SetLocation(Form form, Control ctrl, Point point)
{
try
{
if (ctrl.InvokeRequired)
{
SetLocationCallback d = new SetLocationCallback(SetLocation);
form.Invoke(d, new object[] { form, ctrl, point });
}
else
{
ctrl.Location = point;
}
}
catch (Exception e)
{
MessageBox.Show("# Error setLocation \n\n" + e);
}
}
/// <summary>
/// Where to set the new location of the label
/// </summary>
/// <param name="newLocation">Location relative to window</param>
private void SetLocation(Point newLocation)
{
if (label.InvokeRequired)
{
SetLocationCallback cb = new SetLocationCallback(SetLocation);
Invoke(cb, new object[] { newLocation });
}
else
{
label.Location = newLocation;
label.Visible = true;
}
}
/// <summary>
/// This method demonstrates a pattern for making thread-safe
/// calls on a Windows Forms control.
///
/// If the calling thread is different from the thread that
/// created the UserControl object's, this method creates a
/// SetLocationCallback and calls itself asynchronously using the
/// Invoke method.
///
/// If the calling thread is the same as the thread that created
/// the UserControl object's, the Location property is set directly.
/// </summary>
/// <param name="obj">The UserControl object's</param>
/// <param name="newLocation">Move object to this location</param>
public void show(PictureBox obj, Point newLocation)
{
// InvokeRequired required compares the thread ID of the
// calling thread to the thread ID of the creating thread.
// If these threads are different, it returns true.
try
{
#region Set Location in Safely
if (obj.InvokeRequired)
{
SetLocationCallback d = new SetLocationCallback(show);
obj.Invoke(d, new object[] { obj, newLocation });
}
else
{
// if:
// original location = newLocation = (50, 50)
// obj.Size = (70, 70)
// ----------------------------
// Virtual location in form
// (15,15)._______
// |(50,50)|
// 70| .---|---. Original location in form
// | | | |
// |___|___| |
// | |
// ._______.
// <--->
// 35
//
// create virtual location from original location:
obj.Location = new Point(newLocation.X - (obj.Size.Width / 2),
newLocation.Y - (obj.Size.Height / 2));
}
#endregion
}
catch { }
}
