115 lines
3.6 KiB
C#
115 lines
3.6 KiB
C#
#if XFORMS
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namespace Caliburn.Micro.Core.Xamarin.Forms
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#else
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namespace Caliburn.Micro
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#endif
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{
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using System;
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using System.Collections.Generic;
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using System.Reflection;
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#if WinRT
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using Windows.UI.Xaml;
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#elif XFORMS
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using global::Xamarin.Forms;
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using DependencyObject = global::Xamarin.Forms.BindableObject;
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using DependencyProperty = global::Xamarin.Forms.BindableProperty;
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using FrameworkElement = global::Xamarin.Forms.VisualElement;
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#else
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using System.Windows;
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#endif
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/// <summary>
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/// The context used during the execution of an Action or its guard.
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/// </summary>
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public class ActionExecutionContext : IDisposable {
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private WeakReference message;
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private WeakReference source;
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private WeakReference target;
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private WeakReference view;
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private Dictionary<string, object> values;
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/// <summary>
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/// Determines whether the action can execute.
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/// </summary>
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/// <remarks>Returns true if the action can execute, false otherwise.</remarks>
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public Func<bool> CanExecute;
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/// <summary>
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/// Any event arguments associated with the action's invocation.
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/// </summary>
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public object EventArgs;
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/// <summary>
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/// The actual method info to be invoked.
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/// </summary>
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public MethodInfo Method;
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/// <summary>
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/// The message being executed.
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/// </summary>
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public ActionMessage Message {
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get { return message == null ? null : message.Target as ActionMessage; }
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set { message = new WeakReference(value); }
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}
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/// <summary>
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/// The source from which the message originates.
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/// </summary>
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public FrameworkElement Source {
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get { return source == null ? null : source.Target as FrameworkElement; }
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set { source = new WeakReference(value); }
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}
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/// <summary>
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/// The instance on which the action is invoked.
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/// </summary>
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public object Target {
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get { return target == null ? null : target.Target; }
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set { target = new WeakReference(value); }
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}
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/// <summary>
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/// The view associated with the target.
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/// </summary>
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public DependencyObject View {
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get { return view == null ? null : view.Target as DependencyObject; }
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set { view = new WeakReference(value); }
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}
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/// <summary>
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/// Gets or sets additional data needed to invoke the action.
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/// </summary>
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/// <param name="key">The data key.</param>
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/// <returns>Custom data associated with the context.</returns>
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public object this[string key] {
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get {
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if (values == null)
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values = new Dictionary<string, object>();
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object result;
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values.TryGetValue(key, out result);
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return result;
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}
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set {
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if (values == null)
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values = new Dictionary<string, object>();
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values[key] = value;
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}
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}
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/// <summary>
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/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
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/// </summary>
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public void Dispose() {
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Disposing(this, System.EventArgs.Empty);
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}
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/// <summary>
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/// Called when the execution context is disposed
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/// </summary>
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public event EventHandler Disposing = delegate { };
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}
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}
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