Sample code for implementing control dragging in WPF

The basic principle of implementing control drag is to capture the mouse position, and determine the amplitude and timing of the control movement based on the pressing and release of the mouse button.

Simple example:

There is a Button in the Grid that adapts the Button's Margin property through the mouse event, thereby changing the relative position of the Button in the Grid.

<Grid Name="gd">
  <Button Width=90 Height=30 Name="btn">button</Button>
</Grid>

Three events are bound to Button control: mouse press, mouse move, mouse release

public SystemMap()
{
   InitializeComponent();
    += btn_MouseLeftButtonDown;
    += btn_MouseMove;
    += btn_MouseLeftButtonUp;
}

Define variable + mouse press event

Point pos = new Point();
void btn_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
  Button tmp = (Button)sender;
  pos = (null);
  ();
   = ;
}

Mouse movement event

void btn_MouseMove(object sender, MouseEventArgs e)
{
   if (==)
   {
      Button tmp = (Button)sender;
      double dx = (null).X -  + ;
      double dy = (null).Y -  + ;
       = new Thickness(dx, dy, 0, 0);
      pos = (null);
   }
}

Mouse release event

void btn_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
     Button tmp = (Button)sender;
     ();
}

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