CODEWITHSUNDEEP
c#wpfmouseleftbuttondownraiseevent
RajenK
RajenK

Reputation: 1423

Firing MouseLeftButtonDown event programmatically

I'm trying to manually fire a MouseLeftButtonDown event on a WPF control programmatically, as I am using the Microsoft Surface SDK, which does not fire MouseLeftButtonDown events, but ContactDown events. Basically I'm trying to push the MouseLeftButtonDown event down to the control, to fire off the correct behavior on the control, while handling a ContactDown event.

I'm guessing I have to somehow use the RaiseEvent method on the control to do this with MouseButtonEventArgs, but I'm having some trouble figuring out the parameters.

Thanks in advance for your help!

Upvotes: 8

Views: 21998

Answers (4)

marsh-wiggle
marsh-wiggle

Reputation: 2813

This is the static method I use to raise click events for any UIElement.

using System;
using System.Windows;
using System.Windows.Input;

    
public static void RaiseMouseClickEvent(UIElement elementToClick, MouseButton buttonToUse)
{
    elementToClick.RaiseEvent(new MouseButtonEventArgs(Mouse.PrimaryDevice, Environment.TickCount, buttonToUse) { RoutedEvent = Button.ClickEvent });
}

Upvotes: 1

viktorg
viktorg

Reputation: 41

var grid = new Grid();            

int timestamp = new TimeSpan(DateTime.Now.Ticks).Milliseconds;
const MouseButton mouseButton = MouseButton.Left;
var mouseDownEvent =
   new MouseButtonEventArgs(Mouse.PrimaryDevice, timestamp, mouseButton) {
       RoutedEvent = UIElement.MouseLeftButtonDownEvent,
       Source = grid,
   };

This is how I fire the event in my test code.

Upvotes: 4

devios1
devios1

Reputation: 38035

You can spoof mouse and key events using Win32 interop. Investigate the SendInput function on MSDN/pinvoke.net.

Note that this will cause the system and other applications to think the mouse was actually clicked. If you just want to initiate a WPF event, try RaiseEvent( new RoutedEventArgs( UIElement.MouseLeftButtonDownEvent ) ).

Upvotes: 6

Fredrik Mörk
Fredrik Mörk

Reputation: 158399

The wish to trigger a certain event in a control is quite often an indicator of a design problem in the code. Event handlers should trigger behavior, not perform it. I would suggest that you move the code that performs the action triggered by the MouseLeftButtonDown event handler into a separate method. Then the same method can be called from the ContactDown event handler.

Upvotes: 5

Related Questions