using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Reflection;
using System.Text;
using System.Windows.Input;
using System.Windows;
namespace HandyControl.Interactivity
{
public class ExCommandParameter
{
///
/// 事件触发源
///
[AllowNull]
public DependencyObject Sender { get; set; }
///
/// 事件参数
///
[AllowNull]
public EventArgs EventArgs { get; set; }
///
/// 额外参数
///
[AllowNull]
public object Parameter { get; set; }
[AllowNull]
public object CommandName { get; set; }
}
public class ExInvokeCommandAction : TriggerAction
{
public static readonly DependencyProperty CommandNameProperty = DependencyProperty.Register("CommandName", typeof(object), typeof(ExInvokeCommandAction), null);
public static readonly DependencyProperty CommandProperty = DependencyProperty.Register("Command", typeof(ICommand), typeof(ExInvokeCommandAction), null);
public static readonly DependencyProperty CommandParameterProperty = DependencyProperty.Register("CommandParameter", typeof(object), typeof(ExInvokeCommandAction), null);
///
/// 获得或设置此操作应调用的命令的名称。
///
/// 此操作应调用的命令的名称。
/// 如果设置了此属性和 Command 属性，则此属性将被后者所取代。
public object CommandName
{
get
{
base.ReadPreamble();
return GetValue(CommandNameProperty);
}
set
{
if (this.CommandName != value)
{
base.WritePreamble();
SetValue(CommandNameProperty, value);
base.WritePostscript();
}
}
}
///
/// 获取或设置此操作应调用的命令。这是依赖属性。
///
/// 要执行的命令。
/// 如果设置了此属性和 CommandName 属性，则此属性将优先于后者。
public ICommand Command
{
get
{
return (ICommand)GetValue(CommandProperty);
}
set
{
SetValue(CommandProperty, value);
}
}
///
/// 获得或设置命令参数。这是依赖属性。
///
/// 命令参数。
/// 这是传递给 ICommand.CanExecute 和 ICommand.Execute 的值。
public object CommandParameter
{
get
{
return GetValue(CommandParameterProperty);
}
set
{
SetValue(CommandParameterProperty, value);
}
}
///
/// 调用操作。
///
/// 操作的参数。如果操作不需要参数，则可以将参数设置为空引用。
protected override void Invoke(object parameter)
{
if (base.AssociatedObject != null)
{
ICommand? command = this.ResolveCommand();
if (command == null) return;
/*
* ★★★★★★★★★★★★★★★★★★★★★★★★
* 注意这里添加了事件触发源和事件参数
* ★★★★★★★★★★★★★★★★★★★★★★★★
*/
ExCommandParameter exParameter = new ExCommandParameter
{
Sender = base.AssociatedObject,
Parameter = GetValue(CommandParameterProperty),
EventArgs = parameter as EventArgs,
CommandName = GetValue(CommandNameProperty)
};
if (command != null && command.CanExecute(exParameter))
{
/*
* ★★★★★★★★★★★★★★★★★★★★★★★★
* 注意将扩展的参数传递到Execute方法中
* ★★★★★★★★★★★★★★★★★★★★★★★★
*/
command.Execute(exParameter);
}
}
}
private ICommand? ResolveCommand()
{
ICommand? result = null;
if (this.Command != null)
{
result = this.Command;
}
else
{
if (base.AssociatedObject != null)
{
Type type = base.AssociatedObject.GetType();
PropertyInfo[] properties = type.GetProperties(BindingFlags.Instance | BindingFlags.Public);
PropertyInfo[] array = properties;
for (int i = 0; i < array.Length; i++)
{
PropertyInfo propertyInfo = array[i];
if (typeof(ICommand).IsAssignableFrom(propertyInfo.PropertyType) && string.Equals(propertyInfo.Name, this.CommandName?.ToString(), StringComparison.Ordinal))
{
result = (ICommand?)propertyInfo.GetValue(base.AssociatedObject, null);
}
}
}
}
return result;
}
}
}