Windows 8 Store Apps Learning (16) Control Basics: Dependency properties, and so on

Control Basics: Dependency properties, attached properties, control inheritance relationships, routed events, and hit tests

Introduced

Re-imagine the control basics for Windows 8 Store Apps

DependencyProperty-Dependency Properties

Attachedproperty-Attached properties

Inheritance relationships for controls

Routed events and hit tests

Example

1. Develop a custom control with DependencyProperty and Attachedproperty

Mycontrols/themes/generic.xaml

<resourcedictionary
    xmlns= "http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x= "http ://schemas.microsoft.com/winfx/2006/xaml "
    xmlns:local=" Using:mycontrols ">
    
    <!--
        The style of the custom control is defined in this document (THEMES/GENERIC.XAML) to
        
        integrate the external resourcedictionary
    -->
    < resourcedictionary.mergeddictionaries>
        <resourcedictionary source= "ms-appx:///mycontrols/themes/ Mycontrol.xaml "/>
    </ResourceDictionary.MergedDictionaries>
       
</ResourceDictionary>

Mycontrols/themes/mycontrol.xaml

<resourcediction ary xmlns= "http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x= "Http://schema"
        S.microsoft.com/winfx/2006/xaml "xmlns:local=" Using:mycontrols "> <style targettype=" Local:MyControl "> <setter property= "Template" > <Setter.Value> <controltemplate targettype= "L  Ocal:mycontrol "> <border background=" {templatebinding Background} "borderbrush=" {TemplateBinding
                            BorderBrush} "borderthickness=" {templatebinding borderthickness} "> <StackPanel> <!--binding Custom dependency property--> <textblock text= "{templatebinding Title}" Fore
                            ground= "White" fontsize= "26.667"/> <!--binding Custom attached properties-->
                        <textblock text= "{templatebinding Local:MyAttachedProperty.SubTitle}" foreground= "White" fontsize= "14.667"/> </stackpanel> </Border> </ControlTemplate> </setter.value&
        Gt </Setter> </Style> </ResourceDictionary>

Mycontrols/mycontrol.cs

* * Develop a custom control to demonstrate dependency properties (Dependency property) and attached properties (attached property) * Dependency properties: Can be used for styles, templates, bindings, animations * Additional properties: Globally available dependency properties *
/using Windows.UI.Xaml.Controls;
    
Using Windows.UI.Xaml; namespace MyControls {///<summary>///for dependency properties Demo///</summary> public class Mycontrol:con Trol {Public mycontrol () {///specifies that the default style is typeof (MyControl), which corresponds to: <style xmlns:local= "using: MyControls "targettype=" Local:mycontrol "/> This.
        Defaultstylekey = typeof (MyControl);
        ///Access dependency properties through Dependencyobject.getvalue () and Dependencyobject.setvalue (), encapsulated by the Title attribute to facilitate access to dependent properties
            public string Title {get {return (string) GetValue (Titleproperty);}
        set {SetValue (Titleproperty, value);} }//Register a dependent property public static readonly DependencyProperty Titleproperty = Dependencypropert
               Y.register (Name of "Title",//Dependent property) typeof (String),//Dependent property data type typeof (MyControl),///dependency property belongs to class new PropertyMetadata ("", Pr Opertymetadatacallback)); Specifies the default value of the dependent property and the method that is invoked when the value is changed private static void Propertymetadatacallback (DependencyObject sender, Dependency PropertyChangedEventArgs args) {object newvalue = args. NewValue; The value object OldValue = args after the change occurs. OldValue; Value before changes}}///<summary>///for additional properties demo///</summary> public C
            Lass Myattachedproperty {//Get attached property public static string Getsubtitle (DependencyObject obj) { return (string) obj.
        GetValue (Subtitleproperty);
            //Set additional properties public static void Setsubtitle (DependencyObject obj, string value) { Obj.
        SetValue (subtitleproperty, value);
           }//Register an attached property public static readonly DependencyProperty Subtitleproperty = dependencyproperty.registerattached ("subtitle",//attached property name typeof (String),//attached property data type typeof (Myattachedproperty),//attached property to the class new PropertyMetadata ("", Propertymetadatacallback) ); Specifies the default value for the attached property, and the method that is invoked when the value is changed private static void Propertymetadatacallback (DependencyObject sender, Dependency PropertyChangedEventArgs args) {object newvalue = args. NewValue; The value object OldValue = args after the change occurs. OldValue; Value prior to change}}}