For more info, see Custom automation peers. Each topic lists the names of the visual states, the theme resources used, and the full XAML for the style that contains the template. The topics can be useful guidance if you've already started modifying a template and want to see what the original template looked like, or to verify that your new template has all of the required named visual states. This is a technique that enables a single control template to use resources that can be different values depending on which theme is currently active.
This is particularly important for brushes and colors, because the main purpose of the themes is to enable users to choose whether they want a dark, light, or high contrast theme applied to the system overall. Apps that use the XAML resource system can use a resource set that's appropriate for that theme, so that the theme choices in an app's UI are reflective of the user's systemwide theme choice.
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View all page feedback. In this article. WPF provides that model. Another feature of the WPF styling model is the separation of presentation and logic. Designers can work on the appearance of an app by using only XAML at the same time that developers work on the programming logic by using C or Visual Basic.
This overview focuses on the styling and templating aspects of the app and doesn't discuss any data-binding concepts. For information about data binding, see Data Binding Overview. It's important to understand resources, which are what enable styles and templates to be reused. The Desktop Guide documentation for.
NET 6 and. NET 5 including. NET Core 3. The sample code provided in this overview is based on a simple photo browsing application shown in the following illustration. This simple photo sample uses styling and templating to create a visually compelling user experience.
The sample has two TextBlock elements and a ListBox control that is bound to a list of images. For the complete sample, see Introduction to Styling and Templating Sample. You can think of a Style as a convenient way to apply a set of property values to multiple elements. Because styles are resources, they obey the same scoping rules that apply to all resources. Put simply, where you declare a style affects where the style can be applied.
For example, if you declare the style in the root element of your app definition XAML file, the style can be used anywhere in your app. For example, the following XAML code declares two styles for a TextBlock , one automatically applied to all TextBlock elements, and another that must be explicitly referenced. For more information, see Create a style for a control. You can change the structure and appearance of a control by defining a new ControlTemplate and assigning it to a control.
In many cases, templates give you enough flexibility so that you do not have to write your own custom controls. Each control has a default template assigned to the Control. Template property.
The template connects the visual presentation of the control with the control's capabilities. Because you define a template in XAML, you can change the control's appearance without writing any code. Each template is designed for a specific control, such as a Button. As with all resources, scoping rules apply. Control templates are a lot more involved than a style. This is because the control template rewrites the visual appearance of the entire control, while a style simply applies property changes to the existing control.
Notice how we specify a name for each of them. Normally we store the name of each part as a private const string variable. We use them to get the child controls by name. Override the OnApplyTemplate method to try to get the controls with the names that we already known.
HasError attached property is true has the control has focus. HasError attached property is true has the control does not have focus. The element that contains the initial text in the DatePicker.
A visual element that can contain a FrameworkElement. The text of the TextBox is displayed in this element. The DatePickerTextBox is disabled. The mouse pointer is positioned over the DatePickerTextBox.
The user cannot change the text in the DatePickerTextBox. The control displays its initial text.
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