зеркало из https://github.com/DeGsoft/maui-linux.git
133 строки
3.2 KiB
C#
133 строки
3.2 KiB
C#
using System;
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using System.Windows.Input;
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namespace Xamarin.Forms
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{
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public class MenuItem : BaseMenuItem, IMenuItemController
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{
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public static readonly BindableProperty TextProperty = BindableProperty.Create("Text", typeof(string), typeof(MenuItem), null);
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public static readonly BindableProperty CommandProperty = BindableProperty.Create("Command", typeof(ICommand), typeof(MenuItem), null,
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propertyChanging: (bo, o, n) => ((MenuItem)bo).OnCommandChanging(), propertyChanged: (bo, o, n) => ((MenuItem)bo).OnCommandChanged());
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public static readonly BindableProperty CommandParameterProperty = BindableProperty.Create("CommandParameter", typeof(object), typeof(MenuItem), null,
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propertyChanged: (bo, o, n) => ((MenuItem)bo).OnCommandParameterChanged());
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public static readonly BindableProperty IsDestructiveProperty = BindableProperty.Create("IsDestructive", typeof(bool), typeof(MenuItem), false);
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public static readonly BindableProperty IconProperty = BindableProperty.Create("Icon", typeof(FileImageSource), typeof(MenuItem), default(FileImageSource));
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internal static readonly BindableProperty IsEnabledProperty = BindableProperty.Create("IsEnabled", typeof(bool), typeof(ToolbarItem), true);
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string IMenuItemController.IsEnabledPropertyName
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{
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get
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{
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return IsEnabledProperty.PropertyName;
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}
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}
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public ICommand Command
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{
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get { return (ICommand)GetValue(CommandProperty); }
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set { SetValue(CommandProperty, value); }
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}
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public object CommandParameter
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{
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get { return GetValue(CommandParameterProperty); }
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set { SetValue(CommandParameterProperty, value); }
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}
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public FileImageSource Icon
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{
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get { return (FileImageSource)GetValue(IconProperty); }
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set { SetValue(IconProperty, value); }
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}
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public bool IsDestructive
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{
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get { return (bool)GetValue(IsDestructiveProperty); }
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set { SetValue(IsDestructiveProperty, value); }
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}
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public string Text
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{
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get { return (string)GetValue(TextProperty); }
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set { SetValue(TextProperty, value); }
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}
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internal bool IsEnabled
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{
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get { return (bool)GetValue(IsEnabledProperty); }
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set { SetValue(IsEnabledProperty, value); }
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}
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bool IMenuItemController.IsEnabled
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{
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get
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{
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return IsEnabled;
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}
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}
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bool IsEnabledCore
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{
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set { SetValueCore(IsEnabledProperty, value); }
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}
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public event EventHandler Clicked;
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protected virtual void OnClicked()
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{
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EventHandler handler = Clicked;
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if (handler != null)
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handler(this, EventArgs.Empty);
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}
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void IMenuItemController.Activate()
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{
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if (Command != null)
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{
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if (IsEnabled)
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Command.Execute(CommandParameter);
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}
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OnClicked();
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}
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void OnCommandCanExecuteChanged(object sender, EventArgs eventArgs)
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{
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IsEnabledCore = Command.CanExecute(CommandParameter);
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}
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void OnCommandChanged()
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{
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if (Command == null)
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{
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IsEnabledCore = true;
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return;
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}
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IsEnabledCore = Command.CanExecute(CommandParameter);
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Command.CanExecuteChanged += OnCommandCanExecuteChanged;
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}
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void OnCommandChanging()
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{
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if (Command == null)
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return;
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Command.CanExecuteChanged -= OnCommandCanExecuteChanged;
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}
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void OnCommandParameterChanged()
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{
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if (Command == null)
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return;
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IsEnabledCore = Command.CanExecute(CommandParameter);
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}
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}
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} |