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Merge pull request #100 from ChrisPulman/UpdateListView
Update ListView
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| // Copyright (c) Chris Pulman. All rights reserved. | ||
| // Licensed under the MIT license. See LICENSE file in the project root for full license information. | ||
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| namespace CrissCross.WPF.UI.Controls; | ||
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| /// <summary> | ||
| /// Extends <see cref="System.Windows.Controls.ListView"/>, and adds customized support <see cref="ListViewViewState.GridView"/> or <see cref="ListViewViewState.Default"/>. | ||
| /// </summary> | ||
| /// <example> | ||
| /// <code lang="xml"> | ||
| /// <ui:ListView ItemsSource="{Binding ...}" > | ||
| /// <ui:ListView.View> | ||
| /// <GridView> | ||
| /// <GridViewColumn | ||
| /// DisplayMemberBinding="{Binding FirstName}" | ||
| /// Header="First Name" /> | ||
| /// <GridViewColumn | ||
| /// DisplayMemberBinding="{Binding LastName}" | ||
| /// Header="Last Name" /> | ||
| /// </GridView> | ||
| /// </ui:ListView.View> | ||
| /// </ui:ListView> | ||
| /// </code> | ||
| /// </example> | ||
| public class ListView : System.Windows.Controls.ListView | ||
| { | ||
| /// <summary>Identifies the <see cref="ViewState"/> dependency property.</summary> | ||
| public static readonly DependencyProperty ViewStateProperty = DependencyProperty.Register(nameof(ViewState), typeof(ListViewViewState), typeof(ListView), new FrameworkPropertyMetadata(ListViewViewState.Default, OnViewStateChanged)); | ||
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| static ListView() => DefaultStyleKeyProperty.OverrideMetadata(typeof(ListView), new FrameworkPropertyMetadata(typeof(ListView))); | ||
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| /// <summary> | ||
| /// Initializes a new instance of the <see cref="ListView"/> class. | ||
| /// </summary> | ||
| public ListView() => Loaded += OnLoaded; | ||
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| /// <summary> | ||
| /// Gets or sets the view state of the <see cref="ListView"/>, enabling custom logic based on the current view. | ||
| /// </summary> | ||
| /// <value>The current view state of the <see cref="ListView"/>.</value> | ||
| public ListViewViewState ViewState | ||
| { | ||
| get => (ListViewViewState)GetValue(ViewStateProperty); | ||
| set => SetValue(ViewStateProperty, value); | ||
| } | ||
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| /// <summary> | ||
| /// Raises the <see cref="E:ViewStateChanged" /> event. | ||
| /// </summary> | ||
| /// <param name="e">The <see cref="DependencyPropertyChangedEventArgs"/> instance containing the event data.</param> | ||
| protected virtual void OnViewStateChanged(DependencyPropertyChangedEventArgs e) | ||
| { | ||
| // Hook for derived classes to react to ViewState property changes | ||
| } | ||
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| private static void OnViewStateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) | ||
| { | ||
| if (d is not ListView self) | ||
| { | ||
| return; | ||
| } | ||
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| self.OnViewStateChanged(e); | ||
| } | ||
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| private void OnLoaded(object sender, RoutedEventArgs e) | ||
| { | ||
| Loaded -= OnLoaded; // prevent memory leaks | ||
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| // Setup initial ViewState and hook into View property changes | ||
| var descriptor = DependencyPropertyDescriptor.FromProperty(System.Windows.Controls.ListView.ViewProperty, typeof(System.Windows.Controls.ListView)); | ||
| descriptor?.AddValueChanged(this, OnViewPropertyChanged); | ||
| UpdateViewState(); // set the initial state | ||
| } | ||
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| private void OnViewPropertyChanged(object? sender, EventArgs e) => UpdateViewState(); | ||
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| private void UpdateViewState() | ||
| { | ||
| var viewState = View switch | ||
| { | ||
| System.Windows.Controls.GridView => ListViewViewState.GridView, | ||
| null => ListViewViewState.Default, | ||
| _ => ListViewViewState.Default | ||
| }; | ||
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| SetCurrentValue(ViewStateProperty, viewState); | ||
| } | ||
| } |
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