private static void UndoCommand_Executed(object sender, ExecutedRoutedEventArgs e)
{
// Use simple reverse-or-redo Undo (like Notepad).
ColorPickerUserControl colorPicker = (ColorPickerUserControl)sender;
colorPicker.Color = (Color)colorPicker.previousColor;
}
//属性变化回调函数负责使Color属性与Red、Green以及Blue属性保持一致。无论何时Red、Green以及Blue属性发生变化，都会相应地调整Color属性，当
//设置Color属性时，也会更新Red、Green和Blue值
private static void OnColorChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
ColorPickerUserControl colorPicker = (ColorPickerUserControl)sender;
Color oldColor = (Color)e.OldValue;
Color newColor = (Color)e.NewValue;
colorPicker.Red = newColor.R;
colorPicker.Green = newColor.G;
colorPicker.Blue = newColor.B;
colorPicker.previousColor = oldColor;
colorPicker.OnColorChanged(oldColor, newColor);
}
private static void OnColorRGBChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
ColorPickerUserControl colorPicker = (ColorPickerUserControl)sender;
Color color = colorPicker.Color;
if (e.Property == RedProperty)
{
color.R = (byte)e.NewValue;
}
else if (e.Property == GreenProperty)
{
color.G = (byte)e.NewValue;
}
else if (e.Property == BlueProperty)
{
color.B = (byte)e.NewValue;
}
colorPicker.Color = color;
}
/*5: создаем функции обратного вызова*/
private static void OnColorChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
ColorPickerUserControl colorPicker = (ColorPickerUserControl)sender;
Color oldColor = (Color)e.OldValue;
Color newColor = (Color)e.NewValue;
colorPicker.Red = newColor.R;
colorPicker.Green = newColor.G;
colorPicker.Blue = newColor.B;
//newColor.A;
//после изменени¤ св-в Red, Green, Blue из этой ф-ции
//ф-ци¤ OnColorRGBChanged, вызываема¤ 3 раза,
//не вызовет ф-цию OnColorChanged на повторное исполнение
//здесь можно сохран¤ть предыдущее значение св-ва:
colorPicker.previousColor = oldColor;
//вызов издател¤ событи¤ (создетс¤ ниже)
colorPicker.OnColorChanged(oldColor, newColor);
}
void System.Windows.Markup.IComponentConnector.Connect(int connectionId, object target)
{
switch (connectionId)
{
case 1:
this.colorPicker = ((CustomControls.ColorPickerUserControl)(target));
#line 12 "..\..\MyColorPicker.xaml"
this.colorPicker.ColorChanged += new System.Windows.RoutedPropertyChangedEventHandler <System.Windows.Media.Color>(this.colorPicker_ColorChanged);
#line default
#line hidden
return;
case 2:
#line 13 "..\..\MyColorPicker.xaml"
((System.Windows.Controls.Button)(target)).Click += new System.Windows.RoutedEventHandler(this.cmdGet_Click);
#line default
#line hidden
return;
case 3:
#line 14 "..\..\MyColorPicker.xaml"
((System.Windows.Controls.Button)(target)).Click += new System.Windows.RoutedEventHandler(this.cmdSet_Click);
#line default
#line hidden
return;
case 4:
this.lblColor = ((System.Windows.Controls.TextBlock)(target));
return;
}
this._contentLoaded = true;
}
void System.Windows.Markup.IComponentConnector.Connect(int connectionId, object target) {
switch (connectionId)
{
case 1:
this.colorPicker = ((CustomControls.ColorPickerUserControl)(target));
#line 12 "..\..\MyColorPicker.xaml"
this.colorPicker.ColorChanged += new System.Windows.RoutedPropertyChangedEventHandler<System.Windows.Media.Color>(this.colorPicker_ColorChanged);
#line default
#line hidden
return;
case 2:
#line 13 "..\..\MyColorPicker.xaml"
((System.Windows.Controls.Button)(target)).Click += new System.Windows.RoutedEventHandler(this.cmdGet_Click);
#line default
#line hidden
return;
case 3:
#line 14 "..\..\MyColorPicker.xaml"
((System.Windows.Controls.Button)(target)).Click += new System.Windows.RoutedEventHandler(this.cmdSet_Click);
#line default
#line hidden
return;
case 4:
this.lblColor = ((System.Windows.Controls.TextBlock)(target));
return;
}
this._contentLoaded = true;
}
private static void UndoCommand_CanExecute(object sender, CanExecuteRoutedEventArgs e)
{
ColorPickerUserControl colorPicker = (ColorPickerUserControl)sender;
e.CanExecute = colorPicker.previousColor.HasValue;
}
