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| // ****************************************************************************
// <copyright file="EventToCommand.cs" company="GalaSoft Laurent Bugnion">
// Copyright © GalaSoft Laurent Bugnion 2009-2011
// </copyright>
// ****************************************************************************
// <author>Laurent Bugnion</author>
// <email>laurent@galasoft.ch</email>
// <date>3.11.2009</date>
// <project>GalaSoft.MvvmLight.Extras</project>
// <web>http://www.galasoft.ch</web>
// <license>
// See license.txt in this solution or http://www.galasoft.ch/license_MIT.txt
// </license>
// <LastBaseLevel>BL0002</LastBaseLevel>
// ****************************************************************************
using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Interactivity;
////using GalaSoft.Utilities.Attributes;
namespace GalaSoft.MvvmLight.Command
{
/// <summary>
/// This <see cref="System.Windows.Interactivity.TriggerAction" /> can be
/// used to bind any event on any FrameworkElement to an <see cref="ICommand" />.
/// Typically, this element is used in XAML to connect the attached element
/// to a command located in a ViewModel. This trigger can only be attached
/// to a FrameworkElement or a class deriving from FrameworkElement.
/// <para>To access the EventArgs of the fired event, use a RelayCommand<EventArgs>
/// and leave the CommandParameter and CommandParameterValue empty!</para>
/// </summary>
////[ClassInfo(typeof(EventToCommand),
//// VersionString = "3.0.0.0",
//// DateString = "201003041420",
//// Description = "A Trigger used to bind any event to an ICommand.",
//// UrlContacts = "http://www.galasoft.ch/contact_en.html",
//// Email = "laurent@galasoft.ch")]
public partial class EventToCommand : TriggerAction<DependencyObject>
{
/// <summary>
/// Gets or sets a value indicating whether the EventArgs passed to the
/// event handler will be forwarded to the ICommand's Execute method
/// when the event is fired (if the bound ICommand accepts an argument
/// of type EventArgs).
/// <para>For example, use a RelayCommand<MouseEventArgs> to get
/// the arguments of a MouseMove event.</para>
/// </summary>
public bool PassEventArgsToCommand
{
get;
set;
}
/// <summary>
/// Provides a simple way to invoke this trigger programatically
/// without any EventArgs.
/// </summary>
public void Invoke()
{
Invoke(null);
}
/// <summary>
/// Executes the trigger.
/// <para>To access the EventArgs of the fired event, use a RelayCommand<EventArgs>
/// and leave the CommandParameter and CommandParameterValue empty!</para>
/// </summary>
/// <param name="parameter">The EventArgs of the fired event.</param>
protected override void Invoke(object parameter)
{
if (AssociatedElementIsDisabled())
{
return;
}
var command = GetCommand();
var commandParameter = CommandParameterValue;
if (commandParameter == null
&& PassEventArgsToCommand)
{
commandParameter = parameter;
}
if (command != null
&& command.CanExecute(commandParameter))
{
command.Execute(commandParameter);
}
}
private static void OnCommandChanged(
EventToCommand element,
DependencyPropertyChangedEventArgs e)
{
if (element == null)
{
return;
}
if (e.OldValue != null)
{
((ICommand) e.OldValue).CanExecuteChanged -= element.OnCommandCanExecuteChanged;
}
var command = (ICommand) e.NewValue;
if (command != null)
{
command.CanExecuteChanged += element.OnCommandCanExecuteChanged;
}
element.EnableDisableElement();
}
private bool AssociatedElementIsDisabled()
{
var element = GetAssociatedObject();
return AssociatedObject == null
|| (element != null
&& !element.IsEnabled);
}
private void EnableDisableElement()
{
var element = GetAssociatedObject();
if (element == null)
{
return;
}
var command = this.GetCommand();
if (this.MustToggleIsEnabledValue
&& command != null)
{
element.IsEnabled = command.CanExecute(this.CommandParameterValue);
}
}
private void OnCommandCanExecuteChanged(object sender, EventArgs e)
{
EnableDisableElement();
}
}
} |
capter un événement dans un TreeView par Binding dans mon ViewModel
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