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Zero/ZeroLevel.WPF/Controls/VirtualToggleButton.cs

268 lines
9.2 KiB

using System;
using System.Windows;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
namespace ZeroLevel.WPF
{
public static class VirtualToggleButton
{
#region attached properties
#region IsChecked
/// <summary>
/// IsChecked Attached Dependency Property
/// </summary>
public static readonly DependencyProperty IsCheckedProperty =
DependencyProperty.RegisterAttached("IsChecked", typeof(Nullable<bool>), typeof(VirtualToggleButton),
new FrameworkPropertyMetadata((Nullable<bool>)false,
FrameworkPropertyMetadataOptions.BindsTwoWayByDefault | FrameworkPropertyMetadataOptions.Journal,
new PropertyChangedCallback(OnIsCheckedChanged)));
/// <summary>
/// Gets the IsChecked property. This dependency property
/// indicates whether the toggle button is checked.
/// </summary>
public static Nullable<bool> GetIsChecked(DependencyObject d)
{
return (Nullable<bool>)d.GetValue(IsCheckedProperty);
}
/// <summary>
/// Sets the IsChecked property. This dependency property
/// indicates whether the toggle button is checked.
/// </summary>
public static void SetIsChecked(DependencyObject d, Nullable<bool> value)
{
d.SetValue(IsCheckedProperty, value);
}
/// <summary>
/// Handles changes to the IsChecked property.
/// </summary>
private static void OnIsCheckedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
UIElement pseudobutton = d as UIElement;
if (pseudobutton != null)
{
Nullable<bool> newValue = (Nullable<bool>)e.NewValue;
if (newValue == true)
{
RaiseCheckedEvent(pseudobutton);
}
else if (newValue == false)
{
RaiseUncheckedEvent(pseudobutton);
}
else
{
RaiseIndeterminateEvent(pseudobutton);
}
}
}
#endregion
#region IsThreeState
/// <summary>
/// IsThreeState Attached Dependency Property
/// </summary>
public static readonly DependencyProperty IsThreeStateProperty =
DependencyProperty.RegisterAttached("IsThreeState", typeof(bool), typeof(VirtualToggleButton),
new FrameworkPropertyMetadata((bool)false));
/// <summary>
/// Gets the IsThreeState property. This dependency property
/// indicates whether the control supports two or three states.
/// IsChecked can be set to null as a third state when IsThreeState is true.
/// </summary>
public static bool GetIsThreeState(DependencyObject d)
{
return (bool)d.GetValue(IsThreeStateProperty);
}
/// <summary>
/// Sets the IsThreeState property. This dependency property
/// indicates whether the control supports two or three states.
/// IsChecked can be set to null as a third state when IsThreeState is true.
/// </summary>
public static void SetIsThreeState(DependencyObject d, bool value)
{
d.SetValue(IsThreeStateProperty, value);
}
#endregion
#region IsVirtualToggleButton
/// <summary>
/// IsVirtualToggleButton Attached Dependency Property
/// </summary>
public static readonly DependencyProperty IsVirtualToggleButtonProperty =
DependencyProperty.RegisterAttached("IsVirtualToggleButton", typeof(bool), typeof(VirtualToggleButton),
new FrameworkPropertyMetadata((bool)false,
new PropertyChangedCallback(OnIsVirtualToggleButtonChanged)));
/// <summary>
/// Gets the IsVirtualToggleButton property. This dependency property
/// indicates whether the object to which the property is attached is treated as a VirtualToggleButton.
/// If true, the object will respond to keyboard and mouse input the same way a ToggleButton would.
/// </summary>
public static bool GetIsVirtualToggleButton(DependencyObject d)
{
return (bool)d.GetValue(IsVirtualToggleButtonProperty);
}
/// <summary>
/// Sets the IsVirtualToggleButton property. This dependency property
/// indicates whether the object to which the property is attached is treated as a VirtualToggleButton.
/// If true, the object will respond to keyboard and mouse input the same way a ToggleButton would.
/// </summary>
public static void SetIsVirtualToggleButton(DependencyObject d, bool value)
{
d.SetValue(IsVirtualToggleButtonProperty, value);
}
/// <summary>
/// Handles changes to the IsVirtualToggleButton property.
/// </summary>
private static void OnIsVirtualToggleButtonChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
IInputElement element = d as IInputElement;
if (element != null)
{
if ((bool)e.NewValue)
{
element.MouseLeftButtonDown += OnMouseLeftButtonDown;
element.KeyDown += OnKeyDown;
}
else
{
element.MouseLeftButtonDown -= OnMouseLeftButtonDown;
element.KeyDown -= OnKeyDown;
}
}
}
#endregion
#endregion
#region routed events
#region Checked
/// <summary>
/// A static helper method to raise the Checked event on a target element.
/// </summary>
/// <param name="target">UIElement or ContentElement on which to raise the event</param>
internal static RoutedEventArgs RaiseCheckedEvent(UIElement target)
{
if (target == null) return null;
RoutedEventArgs args = new RoutedEventArgs();
args.RoutedEvent = ToggleButton.CheckedEvent;
RaiseEvent(target, args);
return args;
}
#endregion
#region Unchecked
/// <summary>
/// A static helper method to raise the Unchecked event on a target element.
/// </summary>
/// <param name="target">UIElement or ContentElement on which to raise the event</param>
internal static RoutedEventArgs RaiseUncheckedEvent(UIElement target)
{
if (target == null) return null;
RoutedEventArgs args = new RoutedEventArgs();
args.RoutedEvent = ToggleButton.UncheckedEvent;
RaiseEvent(target, args);
return args;
}
#endregion
#region Indeterminate
/// <summary>
/// A static helper method to raise the Indeterminate event on a target element.
/// </summary>
/// <param name="target">UIElement or ContentElement on which to raise the event</param>
internal static RoutedEventArgs RaiseIndeterminateEvent(UIElement target)
{
if (target == null) return null;
RoutedEventArgs args = new RoutedEventArgs();
args.RoutedEvent = ToggleButton.IndeterminateEvent;
RaiseEvent(target, args);
return args;
}
#endregion
#endregion
#region private methods
private static void OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
e.Handled = true;
UpdateIsChecked(sender as DependencyObject);
}
private static void OnKeyDown(object sender, KeyEventArgs e)
{
if (e.OriginalSource == sender)
{
if (e.Key == Key.Space)
{
// ignore alt+space which invokes the system menu
if ((Keyboard.Modifiers & ModifierKeys.Alt) == ModifierKeys.Alt) return;
UpdateIsChecked(sender as DependencyObject);
e.Handled = true;
}
else if (e.Key == Key.Enter && (bool)(sender as DependencyObject).GetValue(KeyboardNavigation.AcceptsReturnProperty))
{
UpdateIsChecked(sender as DependencyObject);
e.Handled = true;
}
}
}
private static void UpdateIsChecked(DependencyObject d)
{
Nullable<bool> isChecked = GetIsChecked(d);
if (isChecked == true)
{
SetIsChecked(d, GetIsThreeState(d) ? (Nullable<bool>)null : (Nullable<bool>)false);
}
else
{
SetIsChecked(d, isChecked.HasValue);
}
}
private static void RaiseEvent(DependencyObject target, RoutedEventArgs args)
{
if (target is UIElement)
{
(target as UIElement).RaiseEvent(args);
}
else if (target is ContentElement)
{
(target as ContentElement).RaiseEvent(args);
}
}
#endregion
}
}

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