Building Mouse-enabled Controls

The MultiPoint Mouse WPF control derives from the existing WPF control class and implements additional interfaces to support MultiPoint Mouse events. This topic describes how to build a MultiPoint Mouse-enabled WPF control named “MultipointButton”.

The MultipointButton control derives from the WPF System.Windows.Controls.Button control class, and implements the IMultipointMouseEvents and IMultipointGenericDeviceEvents interfaces.

The IMultipointMouseEvents interface declares all the MultiPoint Mouse device-related events that you should implement for every MultiPoint Mouse-enabled control. The MultiPoint Mouse-enabled controls use the add and remove accessors to add and remove event handlers to MultiPoint Mouse device-related events. The MultipointButton class inherits from this interface to support device-related events:

public class MultipointButton : System.Windows.Controls.Button, IMultipointMouseEvents, IMultipointGenericDeviceEvents
{

}

MultipointButton implements the events defined in the interfaces:

public event RoutedEventHandler MultipointMouseLeftButtonDown 
{
     add
     {
         MultipointMouseEvents.AddMouseLeftButtonDownHandler(this, value);
     }
     remove 
     {
         MultipointMouseEvents.RemoveMouseLeftButtonDownHandler(this, value);
     }
} 

This code above Multipoint Mouse MouseLeftButtonDown events and provides add and remove accessors to register and un-register event handlers with this event. Other MultiPoint Mouse device-specific events are available in this class. The following is an example of the syntax for these events:

public event RoutedEventHandler MultipointXxxxx
{
     add
     {
         MultipointMouseEvents. AddXxxxxHandler(this, value);
     }
     remove 
     {
         MultipointMouseEvents. RemoveXxxxxHandler(this, value);
     }
}