I was looking for a solution to make a Form Generator application with WPF. But my big problem was "How can I move my controls by user's mouse events on the Grid or other container controls".
I've searched a lot on the internet, but none of my search results helped me. Finally, I found how
Canvas control and its properties can be helpful. And with using
Canvas control, I created my own
Using the Code
As I said, to be able to move an object with mouse or other input devices at run time, we can use a
Canvas control. When you add a control (like
Button) to a
Canvas, this control gets some properties that all of them are depending on the
Canvas control. Properties like
With these properties, we can move an object (control) where we want on its parent (
Canvas). To do this, we should have three events:
MouseLeftButtonUp. In some components, the
MouseLeftButtonDown doesn't fire because of that, I used the
MouseLeftButtonDown event code is like this:
private void MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
FirstXPos = e.GetPosition(sender as Control).X;
FirstYPos = e.GetPosition(sender as Control).Y;
FirstArrowXPos = e.GetPosition((sender as Control).Parent as Control).X - FirstXPos;
FirstArrowYPos = e.GetPosition((sender as Control).Parent as Control).Y - FirstYPos;
MovingObject = sender;
MouseLeftButtonUp event code is like this:
void PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
MovingObject = null;
And our main event, "
MouseMove", is like this:
private void MouseMove(object sender, MouseEventArgs e)
if (e.LeftButton == MouseButtonState.Pressed)
(MovingObject as FrameworkElement).SetValue(Canvas.LeftProperty,
e.GetPosition((MovingObject as FrameworkElement).Parent as FrameworkElement).X - FirstXPos);
(MovingObject as FrameworkElement).SetValue(Canvas.TopProperty,
e.GetPosition((MovingObject as FrameworkElement).Parent as FrameworkElement).Y - FirstYPos);
I hope this tip helps you to solve your possibility problems with drag and drop in WPF.
I'm addict of developing softwares and designing solutions for projects.
My favorite work in programming is designing Components and user controls.