[英]WPF: Is there a way to override part of a ControlTemplate without redefining the whole style?
I am trying to style a WPF xctk:ColorPicker. 我正在尝试设置WPF xctk:ColorPicker。 I want to change the background color of the dropdown view and text without redefining the whole style.
我想更改下拉视图和文本的背景颜色, 而不重新定义整个样式。
I know that the ColorPicker contains eg a part named "PART_ColorPickerPalettePopup". 我知道ColorPicker包含例如名为“PART_ColorPickerPalettePopup”的部件。 Is there a way that I can directly reference this part in my style, providing eg a new Background color only ?
有没有办法,我可以直接在我的风格引用这个部分,提供例如, 仅一个新的背景颜色的方法吗?
I want to avoid having to redefine all the other properties of "PART_ColorPickerPalettePopup". 我想避免重新定义“PART_ColorPickerPalettePopup”的所有其他属性。
Link to the ColorPicker I am describing 链接到我正在描述的ColorPicker
You can base a Style on another Style and override specfic setters: 您可以将样式基于另一个样式并覆盖特定的setter:
<Style x:Key="myStyle" TargetType="xctk:ColorPicker" BasedOn="{StaticResource {x:Type xctk:ColorPicker}}">
<!-- This will override the Background setter of the base style -->
<Setter Property="Background" Value="Red" />
</Style>
But you cannot "override" only a part of a ControlTemplate. 但是你不能只“覆盖”ControlTemplate的一部分。 Unfortunately you must then (re)define the entire template as a whole.
不幸的是,您必须(重新)定义整个模板。
Get popup from ColorPicker via VisualTreeHelper and change border properties (child of popup) like this: 通过VisualTreeHelper从ColorPicker获取弹出窗口并更改边框属性(弹出窗口的子项),如下所示:
private void colorPicker_Loaded(object sender,RoutedEventArgs e)
{
Popup popup = FindVisualChildByName<Popup> ((sender as DependencyObject),"PART_ColorPickerPalettePopup");
Border border = FindVisualChildByName<Border> (popup.Child,"DropDownBorder");
border.Background = Brushes.Yellow;
}
private T FindVisualChildByName<T>(DependencyObject parent,string name) where T:DependencyObject
{
for (int i = 0;i < VisualTreeHelper.GetChildrenCount (parent);i++)
{
var child = VisualTreeHelper.GetChild (parent,i);
string controlName = child.GetValue (Control.NameProperty) as string;
if (controlName == name)
{
return child as T;
}
else
{
T result = FindVisualChildByName<T> (child,name);
if (result != null)
return result;
}
}
return null;
}
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