Mapping TouchMove Events to MouseMove Events in WPF - wpf

Question

I'm implementing a simple drag and drop feature in a WPF application. I want this application to run on both desktops with no touch support and also on tablets with only touch support.
Currently I have a MouseMove and TouchMove handler, both implementing the same logic (Starting the DoDragDrop()).
How can I route the input from touch to the mouse handler or visa versa to reduce redundant code? Further how would one route a simple tap to a click event?

Answer 1

I just done a quick test and one way to do this is to create a Global event handler.
Since TouchEventArgs and MouseButtonEventArgs derive from InputEventArgs, your global handler will just implement InputEventArgs
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
//private void Button_TouchMove(object sender, TouchEventArgs e)
//{
// TouchEventArgs derives from InputEventArgs
//}
// private void Button_MouseMove(object sender, MouseButtonEventArgs e)
//{
// MouseButtonEventArgs derives from InputEventArgs
//}
private void GlobalHandler(object sender, InputEventArgs e)
{
// This will fire for both TouchEventArgs and MouseButtonEventArgs
// If you need specific information from the event args you can just cast.
// e.g. var args = e as MouseButtonEventArgs;
}
}
Xaml:
<Window x:Class="WpfApplication3.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid >
<Button MouseMove="GlobalHandler" TouchMove="GlobalHandler"/>
</Grid>
</Window>
Hope this helps