mirror of
https://github.com/Stone-Red-Code/docs-desktop.git
synced 2026-09-09 16:06:09 +02:00
Content update - Marking routed events as handled, and class handling (user story 1878475) (#1339)
* Add article, code, toc, and redirects * Minor edits * Minor edit for clarity
This commit is contained in:
Tris Shores
+9
@@ -0,0 +1,9 @@
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||||
<Application x:Class="CodeSampleCsharp.App"
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||||
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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||||
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
|
||||
xmlns:local="clr-namespace:CodeSampleCsharp"
|
||||
StartupUri="MainWindow.xaml">
|
||||
<Application.Resources>
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||||
|
||||
</Application.Resources>
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</Application>
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||||
+11
@@ -0,0 +1,11 @@
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using System.Windows;
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||||
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||||
namespace CodeSampleCsharp
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{
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||||
/// <summary>
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/// Interaction logic for App.xaml
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/// </summary>
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public partial class App : Application
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||||
{
|
||||
}
|
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}
|
||||
+10
@@ -0,0 +1,10 @@
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using System.Windows;
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||||
|
||||
[assembly: ThemeInfo(
|
||||
ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
|
||||
//(used if a resource is not found in the page,
|
||||
// or application resource dictionaries)
|
||||
ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
|
||||
//(used if a resource is not found in the page,
|
||||
// app, or any theme specific resource dictionaries)
|
||||
)]
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||||
+25
@@ -0,0 +1,25 @@
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||||
<Project Sdk="Microsoft.NET.Sdk">
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||||
|
||||
<PropertyGroup>
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||||
<OutputType>WinExe</OutputType>
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<TargetFramework>net6.0-windows</TargetFramework>
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<UseWPF>true</UseWPF>
|
||||
<NeutralLanguage>en-us</NeutralLanguage>
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||||
</PropertyGroup>
|
||||
|
||||
<ItemGroup>
|
||||
<Compile Update="Properties\Resources.Designer.cs">
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||||
<DesignTime>True</DesignTime>
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||||
<AutoGen>True</AutoGen>
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||||
<DependentUpon>Resources.resx</DependentUpon>
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||||
</Compile>
|
||||
</ItemGroup>
|
||||
|
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<ItemGroup>
|
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<EmbeddedResource Update="Properties\Resources.resx">
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<Generator>ResXFileCodeGenerator</Generator>
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||||
<LastGenOutput>Resources.Designer.cs</LastGenOutput>
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</EmbeddedResource>
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</ItemGroup>
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||||
|
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</Project>
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+63
@@ -0,0 +1,63 @@
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using System.Diagnostics;
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using System.Windows;
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namespace CodeSampleCsharp
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{
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internal static class Handler
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{
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public static void InstanceEventInfo(object sender, RoutedEventArgs e)
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{
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string senderName = ((FrameworkElement)sender).Name;
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string sourceName = ((FrameworkElement)e.Source).Name;
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string eventName = e.RoutedEvent.Name;
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string handledEventsToo = e.Handled ? " Parameter handledEventsToo set to true." : "";
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Debug.WriteLine($"The instance handler attached to {senderName} " +
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$"was triggered by the {eventName} routed event raised on {sourceName}.{handledEventsToo}");
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}
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public static void ClassEventInfo_Static(object sender, RoutedEventArgs e)
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{
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string senderName = ((FrameworkElement)sender).Name;
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string sourceName = ((FrameworkElement)e.Source).Name;
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string eventName = e.RoutedEvent.Name;
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string handledEventsToo = e.Handled ? " Parameter handledEventsToo set to true." : "";
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Debug.WriteLine($"The static class handler attached to {senderName} " +
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$"was triggered by the {eventName} routed event raised on {sourceName}.{handledEventsToo}");
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}
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public static void ClassEventInfo_Override(object sender, RoutedEventArgs e)
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{
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string senderName = ((FrameworkElement)sender).Name;
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string sourceName = ((FrameworkElement)e.Source).Name;
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string eventName = e.RoutedEvent.Name;
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string handledEventsToo = e.Handled ? " Parameter handledEventsToo set to true." : "";
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Debug.WriteLine($"The override class handler attached to {senderName} " +
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$"was triggered by the {eventName} routed event raised on {sourceName}.{handledEventsToo}");
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}
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public static void ClassEventInfoBase_Static(object sender, RoutedEventArgs e)
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{
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string senderName = ((FrameworkElement)sender).Name + "Base";
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string sourceName = ((FrameworkElement)e.Source).Name;
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string eventName = e.RoutedEvent.Name;
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string handledEventsToo = e.Handled ? " Parameter handledEventsToo set to true." : "";
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Debug.WriteLine($"The static class handler attached to {senderName} " +
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$"was triggered by the {eventName} routed event raised on {sourceName}.{handledEventsToo}");
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}
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public static void ClassEventInfoBase_Override(object sender, RoutedEventArgs e)
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{
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string senderName = ((FrameworkElement)sender).Name + "Base";
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string sourceName = ((FrameworkElement)e.Source).Name;
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string eventName = e.RoutedEvent.Name;
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string handledEventsToo = e.Handled ? " Parameter handledEventsToo set to true." : "";
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Debug.WriteLine($"The override class handler attached to {senderName} " +
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$"was triggered by the {eventName} routed event raised on {sourceName}.{handledEventsToo}");
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}
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}
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}
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+18
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<Window x:Class="CodeSampleCsharp.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:custom="clr-namespace:CodeSampleCsharp"
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Title="Preview events" Height="100" Width="300">
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<!--<InstanceEventHandling>-->
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<StackPanel Name="outerStackPanel" VerticalAlignment="Center">
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<custom:ComponentWrapper
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x:Name="componentWrapper"
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TextBox.PreviewKeyDown="HandlerInstanceEventInfo"
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HorizontalAlignment="Center">
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<TextBox Name="componentTextBox" Width="200" />
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</custom:ComponentWrapper>
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</StackPanel>
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<!--</InstanceEventHandling>-->
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|
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</Window>
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+78
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using System.Diagnostics;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Input;
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namespace CodeSampleCsharp
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{
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//<InstanceEventHandling>
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public partial class MainWindow : Window
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{
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public MainWindow()
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{
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InitializeComponent();
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// Attach an instance handler on componentWrapper that will be invoked by handled KeyDown events.
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componentWrapper.AddHandler(KeyDownEvent, new RoutedEventHandler(Handler.InstanceEventInfo),
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handledEventsToo: true);
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}
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// The handler attached to componentWrapper in XAML.
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public void HandlerInstanceEventInfo(object sender, KeyEventArgs e) =>
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Handler.InstanceEventInfo(sender, e);
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||||
}
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//</InstanceEventHandling>
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//<ClassEventHandling>
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public class ComponentWrapper : ComponentWrapperBase
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{
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static ComponentWrapper()
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{
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// Class event handler implemented in the static constructor.
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EventManager.RegisterClassHandler(typeof(ComponentWrapper), KeyDownEvent,
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new RoutedEventHandler(Handler.ClassEventInfo_Static));
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}
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// Class event handler that overrides a base class virtual method.
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protected override void OnKeyDown(KeyEventArgs e)
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{
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Handler.ClassEventInfo_Override(this, e);
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// Call the base OnKeyDown implementation on ComponentWrapperBase.
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base.OnKeyDown(e);
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}
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}
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||||
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public class ComponentWrapperBase : StackPanel
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||||
{
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||||
// Class event handler implemented in the static constructor.
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static ComponentWrapperBase()
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{
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EventManager.RegisterClassHandler(typeof(ComponentWrapperBase), KeyDownEvent,
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new RoutedEventHandler(Handler.ClassEventInfoBase_Static));
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}
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// Class event handler that overrides a base class virtual method.
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protected override void OnKeyDown(KeyEventArgs e)
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{
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Handler.ClassEventInfoBase_Override(this, e);
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e.Handled = true;
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Debug.WriteLine("The KeyDown routed event is marked as handled.");
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// Call the base OnKeyDown implementation on StackPanel.
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base.OnKeyDown(e);
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}
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}
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//</ClassEventHandling>
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/* Debug output:
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The instance handler attached to componentWrapper was triggered by the PreviewKeyDown routed event raised on componentTextBox.
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The static class handler attached to componentWrapper was triggered by the KeyDown routed event raised on componentTextBox.
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||||
The static class handler attached to componentWrapperBase was triggered by the KeyDown routed event raised on componentTextBox.
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||||
The override class handler attached to componentWrapper was triggered by the KeyDown routed event raised on componentTextBox.
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||||
The override class handler attached to componentWrapperBase was triggered by the KeyDown routed event raised on componentTextBox.
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The KeyDown routed event is marked as handled.
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The instance handler attached to componentWrapper was triggered by the KeyDown routed event raised on componentTextBox. Parameter handledEventsToo set to true.
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*/
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||||
}
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||||
+63
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||||
//------------------------------------------------------------------------------
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||||
// <auto-generated>
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||||
// This code was generated by a tool.
|
||||
// Runtime Version:4.0.30319.42000
|
||||
//
|
||||
// Changes to this file may cause incorrect behavior and will be lost if
|
||||
// the code is regenerated.
|
||||
// </auto-generated>
|
||||
//------------------------------------------------------------------------------
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||||
|
||||
namespace CodeSampleCsharp.Properties {
|
||||
using System;
|
||||
|
||||
|
||||
/// <summary>
|
||||
/// A strongly-typed resource class, for looking up localized strings, etc.
|
||||
/// </summary>
|
||||
// This class was auto-generated by the StronglyTypedResourceBuilder
|
||||
// class via a tool like ResGen or Visual Studio.
|
||||
// To add or remove a member, edit your .ResX file then rerun ResGen
|
||||
// with the /str option, or rebuild your VS project.
|
||||
[global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "17.0.0.0")]
|
||||
[global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
|
||||
[global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
|
||||
internal class Resources {
|
||||
|
||||
private static global::System.Resources.ResourceManager resourceMan;
|
||||
|
||||
private static global::System.Globalization.CultureInfo resourceCulture;
|
||||
|
||||
[global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
|
||||
internal Resources() {
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Returns the cached ResourceManager instance used by this class.
|
||||
/// </summary>
|
||||
[global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
|
||||
internal static global::System.Resources.ResourceManager ResourceManager {
|
||||
get {
|
||||
if (object.ReferenceEquals(resourceMan, null)) {
|
||||
global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("CodeSampleCsharp.Properties.Resources", typeof(Resources).Assembly);
|
||||
resourceMan = temp;
|
||||
}
|
||||
return resourceMan;
|
||||
}
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Overrides the current thread's CurrentUICulture property for all
|
||||
/// resource lookups using this strongly typed resource class.
|
||||
/// </summary>
|
||||
[global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
|
||||
internal static global::System.Globalization.CultureInfo Culture {
|
||||
get {
|
||||
return resourceCulture;
|
||||
}
|
||||
set {
|
||||
resourceCulture = value;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
+120
@@ -0,0 +1,120 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<root>
|
||||
<!--
|
||||
Microsoft ResX Schema
|
||||
|
||||
Version 2.0
|
||||
|
||||
The primary goals of this format is to allow a simple XML format
|
||||
that is mostly human readable. The generation and parsing of the
|
||||
various data types are done through the TypeConverter classes
|
||||
associated with the data types.
|
||||
|
||||
Example:
|
||||
|
||||
... ado.net/XML headers & schema ...
|
||||
<resheader name="resmimetype">text/microsoft-resx</resheader>
|
||||
<resheader name="version">2.0</resheader>
|
||||
<resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
|
||||
<resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
|
||||
<data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
|
||||
<data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
|
||||
<data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
|
||||
<value>[base64 mime encoded serialized .NET Framework object]</value>
|
||||
</data>
|
||||
<data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
|
||||
<value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
|
||||
<comment>This is a comment</comment>
|
||||
</data>
|
||||
|
||||
There are any number of "resheader" rows that contain simple
|
||||
name/value pairs.
|
||||
|
||||
Each data row contains a name, and value. The row also contains a
|
||||
type or mimetype. Type corresponds to a .NET class that support
|
||||
text/value conversion through the TypeConverter architecture.
|
||||
Classes that don't support this are serialized and stored with the
|
||||
mimetype set.
|
||||
|
||||
The mimetype is used for serialized objects, and tells the
|
||||
ResXResourceReader how to depersist the object. This is currently not
|
||||
extensible. For a given mimetype the value must be set accordingly:
|
||||
|
||||
Note - application/x-microsoft.net.object.binary.base64 is the format
|
||||
that the ResXResourceWriter will generate, however the reader can
|
||||
read any of the formats listed below.
|
||||
|
||||
mimetype: application/x-microsoft.net.object.binary.base64
|
||||
value : The object must be serialized with
|
||||
: System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
|
||||
: and then encoded with base64 encoding.
|
||||
|
||||
mimetype: application/x-microsoft.net.object.soap.base64
|
||||
value : The object must be serialized with
|
||||
: System.Runtime.Serialization.Formatters.Soap.SoapFormatter
|
||||
: and then encoded with base64 encoding.
|
||||
|
||||
mimetype: application/x-microsoft.net.object.bytearray.base64
|
||||
value : The object must be serialized into a byte array
|
||||
: using a System.ComponentModel.TypeConverter
|
||||
: and then encoded with base64 encoding.
|
||||
-->
|
||||
<xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
|
||||
<xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
|
||||
<xsd:element name="root" msdata:IsDataSet="true">
|
||||
<xsd:complexType>
|
||||
<xsd:choice maxOccurs="unbounded">
|
||||
<xsd:element name="metadata">
|
||||
<xsd:complexType>
|
||||
<xsd:sequence>
|
||||
<xsd:element name="value" type="xsd:string" minOccurs="0" />
|
||||
</xsd:sequence>
|
||||
<xsd:attribute name="name" use="required" type="xsd:string" />
|
||||
<xsd:attribute name="type" type="xsd:string" />
|
||||
<xsd:attribute name="mimetype" type="xsd:string" />
|
||||
<xsd:attribute ref="xml:space" />
|
||||
</xsd:complexType>
|
||||
</xsd:element>
|
||||
<xsd:element name="assembly">
|
||||
<xsd:complexType>
|
||||
<xsd:attribute name="alias" type="xsd:string" />
|
||||
<xsd:attribute name="name" type="xsd:string" />
|
||||
</xsd:complexType>
|
||||
</xsd:element>
|
||||
<xsd:element name="data">
|
||||
<xsd:complexType>
|
||||
<xsd:sequence>
|
||||
<xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
|
||||
<xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
|
||||
</xsd:sequence>
|
||||
<xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
|
||||
<xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
|
||||
<xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
|
||||
<xsd:attribute ref="xml:space" />
|
||||
</xsd:complexType>
|
||||
</xsd:element>
|
||||
<xsd:element name="resheader">
|
||||
<xsd:complexType>
|
||||
<xsd:sequence>
|
||||
<xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
|
||||
</xsd:sequence>
|
||||
<xsd:attribute name="name" type="xsd:string" use="required" />
|
||||
</xsd:complexType>
|
||||
</xsd:element>
|
||||
</xsd:choice>
|
||||
</xsd:complexType>
|
||||
</xsd:element>
|
||||
</xsd:schema>
|
||||
<resheader name="resmimetype">
|
||||
<value>text/microsoft-resx</value>
|
||||
</resheader>
|
||||
<resheader name="version">
|
||||
<value>2.0</value>
|
||||
</resheader>
|
||||
<resheader name="reader">
|
||||
<value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
|
||||
</resheader>
|
||||
<resheader name="writer">
|
||||
<value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
|
||||
</resheader>
|
||||
</root>
|
||||
+9
@@ -0,0 +1,9 @@
|
||||
<Application x:Class="Application"
|
||||
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
|
||||
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
|
||||
xmlns:local="clr-namespace:CodeSampleVb"
|
||||
StartupUri="MainWindow.xaml">
|
||||
<Application.Resources>
|
||||
|
||||
</Application.Resources>
|
||||
</Application>
|
||||
+6
@@ -0,0 +1,6 @@
|
||||
Class Application
|
||||
|
||||
' Application-level events, such as Startup, Exit, and DispatcherUnhandledException
|
||||
' can be handled in this file.
|
||||
|
||||
End Class
|
||||
+9
@@ -0,0 +1,9 @@
|
||||
'The ThemeInfo attribute describes where any theme specific and generic resource dictionaries can be found.
|
||||
'1st parameter: where theme specific resource dictionaries are located
|
||||
'(used if a resource is not found in the page,
|
||||
' or application resource dictionaries)
|
||||
|
||||
'2nd parameter: where the generic resource dictionary is located
|
||||
'(used if a resource is not found in the page,
|
||||
'app, and any theme specific resource dictionaries)
|
||||
<Assembly: ThemeInfo(ResourceDictionaryLocation.None, ResourceDictionaryLocation.SourceAssembly)>
|
||||
+23
@@ -0,0 +1,23 @@
|
||||
<Project Sdk="Microsoft.NET.Sdk">
|
||||
|
||||
<PropertyGroup>
|
||||
<OutputType>WinExe</OutputType>
|
||||
<TargetFramework>net6.0-windows</TargetFramework>
|
||||
<RootNamespace>CodeSampleVb</RootNamespace>
|
||||
<NeutralLanguage>en-us</NeutralLanguage>
|
||||
<UseWPF>true</UseWPF>
|
||||
</PropertyGroup>
|
||||
|
||||
<ItemGroup>
|
||||
<Import Include="System.Windows" />
|
||||
<Import Include="System.Windows.Controls" />
|
||||
<Import Include="System.Windows.Data" />
|
||||
<Import Include="System.Windows.Documents" />
|
||||
<Import Include="System.Windows.Input" />
|
||||
<Import Include="System.Windows.Media" />
|
||||
<Import Include="System.Windows.Media.Imaging" />
|
||||
<Import Include="System.Windows.Navigation" />
|
||||
<Import Include="System.Windows.Shapes" />
|
||||
</ItemGroup>
|
||||
|
||||
</Project>
|
||||
+41
@@ -0,0 +1,41 @@
|
||||
Friend Module Handler
|
||||
Sub InstanceEventInfo(sender As Object, e As RoutedEventArgs)
|
||||
Dim senderName As String = (CType(sender, FrameworkElement)).Name
|
||||
Dim sourceName As String = (CType(e.Source, FrameworkElement)).Name
|
||||
Dim eventName As String = e.RoutedEvent.Name
|
||||
Dim handledEventsToo As String = If(e.Handled, " Parameter handledEventsToo set to true.", "")
|
||||
Debug.WriteLine($"The instance handler attached to {senderName} " & $"was triggered by the {eventName} routed event raised on {sourceName}.{handledEventsToo}")
|
||||
End Sub
|
||||
|
||||
Sub ClassEventInfo_Static(sender As Object, e As RoutedEventArgs)
|
||||
Dim senderName As String = (CType(sender, FrameworkElement)).Name
|
||||
Dim sourceName As String = (CType(e.Source, FrameworkElement)).Name
|
||||
Dim eventName As String = e.RoutedEvent.Name
|
||||
Dim handledEventsToo As String = If(e.Handled, " Parameter handledEventsToo set to true.", "")
|
||||
Debug.WriteLine($"The static class handler attached to {senderName} " & $"was triggered by the {eventName} routed event raised on {sourceName}.{handledEventsToo}")
|
||||
End Sub
|
||||
|
||||
Sub ClassEventInfo_Override(sender As Object, e As RoutedEventArgs)
|
||||
Dim senderName As String = (CType(sender, FrameworkElement)).Name
|
||||
Dim sourceName As String = (CType(e.Source, FrameworkElement)).Name
|
||||
Dim eventName As String = e.RoutedEvent.Name
|
||||
Dim handledEventsToo As String = If(e.Handled, " Parameter handledEventsToo set to true.", "")
|
||||
Debug.WriteLine($"The override class handler attached to {senderName} " & $"was triggered by the {eventName} routed event raised on {sourceName}.{handledEventsToo}")
|
||||
End Sub
|
||||
|
||||
Sub ClassEventInfoBase_Static(sender As Object, e As RoutedEventArgs)
|
||||
Dim senderName As String = (CType(sender, FrameworkElement)).Name & "Base"
|
||||
Dim sourceName As String = (CType(e.Source, FrameworkElement)).Name
|
||||
Dim eventName As String = e.RoutedEvent.Name
|
||||
Dim handledEventsToo As String = If(e.Handled, " Parameter handledEventsToo set to true.", "")
|
||||
Debug.WriteLine($"The static class handler attached to {senderName} " & $"was triggered by the {eventName} routed event raised on {sourceName}.{handledEventsToo}")
|
||||
End Sub
|
||||
|
||||
Sub ClassEventInfoBase_Override(sender As Object, e As RoutedEventArgs)
|
||||
Dim senderName As String = (CType(sender, FrameworkElement)).Name & "Base"
|
||||
Dim sourceName As String = (CType(e.Source, FrameworkElement)).Name
|
||||
Dim eventName As String = e.RoutedEvent.Name
|
||||
Dim handledEventsToo As String = If(e.Handled, " Parameter handledEventsToo set to true.", "")
|
||||
Debug.WriteLine($"The override class handler attached to {senderName} " & $"was triggered by the {eventName} routed event raised on {sourceName}.{handledEventsToo}")
|
||||
End Sub
|
||||
End Module
|
||||
+18
@@ -0,0 +1,18 @@
|
||||
<Window x:Class="MainWindow"
|
||||
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
|
||||
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
|
||||
xmlns:custom="clr-namespace:CodeSampleVb"
|
||||
Title="Preview events" Height="100" Width="300">
|
||||
|
||||
<!--<InstanceEventHandling>-->
|
||||
<StackPanel Name="outerStackPanel" VerticalAlignment="Center">
|
||||
<custom:ComponentWrapper
|
||||
x:Name="componentWrapper"
|
||||
TextBox.PreviewKeyDown="HandlerInstanceEventInfo"
|
||||
HorizontalAlignment="Center">
|
||||
<TextBox Name="componentTextBox" Width="200" />
|
||||
</custom:ComponentWrapper>
|
||||
</StackPanel>
|
||||
<!--</InstanceEventHandling>-->
|
||||
|
||||
</Window>
|
||||
+72
@@ -0,0 +1,72 @@
|
||||
'<InstanceEventHandling>
|
||||
Partial Public Class MainWindow
|
||||
Inherits Window
|
||||
|
||||
Public Sub New()
|
||||
InitializeComponent()
|
||||
|
||||
' Attach an instance handler on componentWrapper that will be invoked by handled KeyDown events.
|
||||
componentWrapper.[AddHandler](KeyDownEvent, New RoutedEventHandler(AddressOf InstanceEventInfo),
|
||||
handledEventsToo:=True)
|
||||
End Sub
|
||||
|
||||
' The handler attached to componentWrapper in XAML.
|
||||
Public Sub HandlerInstanceEventInfo(sender As Object, e As KeyEventArgs)
|
||||
InstanceEventInfo(sender, e)
|
||||
End Sub
|
||||
|
||||
End Class
|
||||
'</InstanceEventHandling>
|
||||
|
||||
'<ClassEventHandling>
|
||||
Public Class ComponentWrapper
|
||||
Inherits ComponentWrapperBase
|
||||
|
||||
Shared Sub New()
|
||||
' Class event handler implemented in the static constructor.
|
||||
EventManager.RegisterClassHandler(GetType(ComponentWrapper), KeyDownEvent,
|
||||
New RoutedEventHandler(AddressOf ClassEventInfo_Static))
|
||||
End Sub
|
||||
|
||||
' Class event handler that overrides a base class virtual method.
|
||||
Protected Overrides Sub OnKeyDown(e As KeyEventArgs)
|
||||
ClassEventInfo_Override(Me, e)
|
||||
|
||||
' Call the base OnKeyDown implementation on ComponentWrapperBase.
|
||||
MyBase.OnKeyDown(e)
|
||||
End Sub
|
||||
|
||||
End Class
|
||||
|
||||
Public Class ComponentWrapperBase
|
||||
Inherits StackPanel
|
||||
|
||||
Shared Sub New()
|
||||
' Class event handler implemented in the static constructor.
|
||||
EventManager.RegisterClassHandler(GetType(ComponentWrapperBase), KeyDownEvent,
|
||||
New RoutedEventHandler(AddressOf ClassEventInfoBase_Static))
|
||||
End Sub
|
||||
|
||||
' Class event handler that overrides a base class virtual method.
|
||||
Protected Overrides Sub OnKeyDown(e As KeyEventArgs)
|
||||
ClassEventInfoBase_Override(Me, e)
|
||||
|
||||
e.Handled = True
|
||||
Debug.WriteLine("The KeyDown event is marked as handled.")
|
||||
|
||||
' Call the base OnKeyDown implementation on StackPanel.
|
||||
MyBase.OnKeyDown(e)
|
||||
End Sub
|
||||
|
||||
End Class
|
||||
'</ClassEventHandling>
|
||||
|
||||
' Debug output:
|
||||
'
|
||||
' The instance handler attached to componentWrapper was triggered by the PreviewKeyDown routed event raised on componentTextBox.
|
||||
' The static class handler attached to componentWrapper was triggered by the KeyDown routed event raised on componentTextBox.
|
||||
' The static class handler attached to componentWrapperBase was triggered by the KeyDown routed event raised on componentTextBox.
|
||||
' The override class handler attached to componentWrapper was triggered by the KeyDown routed event raised on componentTextBox.
|
||||
' The override class handler attached to componentWrapperBase was triggered by the KeyDown routed event raised on componentTextBox.
|
||||
' The KeyDown event is marked as handled.
|
||||
' The instance handler attached to componentWrapper was triggered by the KeyDown routed event raised on componentTextBox. Parameter handledEventsToo set to true.
|
||||
Reference in New Issue
Block a user