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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,9 +1,8 @@ | ||
| namespace Anidow | ||
| namespace Anidow; | ||
|
|
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| /// <summary> | ||
| /// Interaction logic for App.xaml | ||
| /// </summary> | ||
| public partial class App | ||
| { | ||
| /// <summary> | ||
| /// Interaction logic for App.xaml | ||
| /// </summary> | ||
| public partial class App | ||
| { | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,146 +1,146 @@ | ||
| // // Created: 20-06-2021 20:32 | ||
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| #nullable enable | ||
| using Microsoft.Xaml.Behaviors; | ||
| using System.Collections.Specialized; | ||
| using System.Linq; | ||
| using System.Runtime.Versioning; | ||
| using System.Windows; | ||
| using System.Windows.Controls; | ||
| using System.Windows.Controls.Primitives; | ||
| using System.Windows.Input; | ||
| using Anidow.Extensions; | ||
| using Microsoft.Xaml.Behaviors; | ||
|
|
||
| namespace Anidow.Behaviors | ||
| { | ||
| /// <summary> | ||
| /// Behavior that enables scrolling to the end of for example a <see cref="ItemsControl"/>. Includes support for pausing of scrolling, when user scrolls manually | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// required namespaces: | ||
| /// <list type="bullet"> | ||
| /// <item> | ||
| /// <description>xmlns:i="http://schemas.microsoft.com/xaml/behaviors"</description> | ||
| /// </item> | ||
| /// </list> | ||
| /// </remarks> | ||
| // source: https://stackoverflow.com/a/25855886 | ||
| // source: https://github.com/Insire/MvvmScarletToolkit/blob/master/src/MvvmScarletToolkit.Wpf/Behaviors/AutoScrollBehavior.cs | ||
| // usage: | ||
| // <i:Interaction.Behaviors> | ||
| // <mvvm:AutoScrollBehavior /> | ||
| // </ i:Interaction.Behaviors> | ||
| namespace Anidow.Behaviors; | ||
|
|
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| /// <summary> | ||
| /// Behavior that enables scrolling to the end of for example a <see cref="ItemsControl" />. Includes support for | ||
| /// pausing of scrolling, when user scrolls manually | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// required namespaces: | ||
| /// <list type="bullet"> | ||
| /// <item> | ||
| /// <description>xmlns:i="http://schemas.microsoft.com/xaml/behaviors"</description> | ||
| /// </item> | ||
| /// </list> | ||
| /// </remarks> | ||
| // source: https://stackoverflow.com/a/25855886 | ||
| // source: https://github.com/Insire/MvvmScarletToolkit/blob/master/src/MvvmScarletToolkit.Wpf/Behaviors/AutoScrollBehavior.cs | ||
| // usage: | ||
| // <i:Interaction.Behaviors> | ||
| // <mvvm:AutoScrollBehavior /> | ||
| // </ i:Interaction.Behaviors> | ||
| #if NET5_0_OR_GREATER | ||
| [System.Runtime.Versioning.SupportedOSPlatform("windows7.0")] | ||
| [SupportedOSPlatform("windows7.0")] | ||
| #endif | ||
|
|
||
| public sealed class AutoScrollBehavior : Behavior<ItemsControl> | ||
| { | ||
| private ScrollViewer? _scrollViewer; | ||
| public sealed class AutoScrollBehavior : Behavior<ItemsControl> | ||
| { | ||
| private bool _autoScroll = true; | ||
| private bool _justWheeled; | ||
| private ScrollViewer? _scrollViewer; | ||
| private bool _userInteracting; | ||
|
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| private bool _autoScroll = true; | ||
| private bool _justWheeled; | ||
| private bool _userInteracting; | ||
| protected override void OnAttached() | ||
| { | ||
| AssociatedObject.Loaded += AssociatedObjectOnLoaded; | ||
| AssociatedObject.Unloaded += AssociatedObjectOnUnloaded; | ||
| } | ||
|
|
||
| protected override void OnAttached() | ||
| private void AssociatedObjectOnUnloaded(object sender, RoutedEventArgs e) | ||
| { | ||
| if (_scrollViewer != null) | ||
| { | ||
| AssociatedObject.Loaded += AssociatedObjectOnLoaded; | ||
| AssociatedObject.Unloaded += AssociatedObjectOnUnloaded; | ||
| _scrollViewer.ScrollChanged -= ScrollViewerOnScrollChanged; | ||
| } | ||
|
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| private void AssociatedObjectOnUnloaded(object sender, RoutedEventArgs e) | ||
| { | ||
| if (_scrollViewer != null) | ||
| { | ||
| _scrollViewer.ScrollChanged -= ScrollViewerOnScrollChanged; | ||
| } | ||
| AssociatedObject.ItemContainerGenerator.ItemsChanged -= ItemContainerGeneratorItemsChanged; | ||
| AssociatedObject.GotMouseCapture -= AssociatedObject_GotMouseCapture; | ||
| AssociatedObject.LostMouseCapture -= AssociatedObject_LostMouseCapture; | ||
| AssociatedObject.PreviewMouseWheel -= AssociatedObject_PreviewMouseWheel; | ||
|
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| AssociatedObject.ItemContainerGenerator.ItemsChanged -= ItemContainerGeneratorItemsChanged; | ||
| AssociatedObject.GotMouseCapture -= AssociatedObject_GotMouseCapture; | ||
| AssociatedObject.LostMouseCapture -= AssociatedObject_LostMouseCapture; | ||
| AssociatedObject.PreviewMouseWheel -= AssociatedObject_PreviewMouseWheel; | ||
| _scrollViewer = null; | ||
| } | ||
|
|
||
| _scrollViewer = null; | ||
| } | ||
| private void AssociatedObjectOnLoaded(object sender, RoutedEventArgs e) | ||
| { | ||
| var scrollViewers = AssociatedObject.FindVisualChildren<ScrollViewer>(); | ||
|
|
||
| private void AssociatedObjectOnLoaded(object sender, RoutedEventArgs e) | ||
| _scrollViewer = scrollViewers.FirstOrDefault(); | ||
| if (_scrollViewer is null) | ||
| { | ||
| var scrollViewers = AssociatedObject.FindVisualChildren<ScrollViewer>(); | ||
| return; | ||
| } | ||
|
|
||
| _scrollViewer = scrollViewers.FirstOrDefault(); | ||
| if (_scrollViewer is null) | ||
| { | ||
| return; | ||
| } | ||
| _scrollViewer.ScrollToBottom(); | ||
|
|
||
| _scrollViewer.ScrollToBottom(); | ||
| _scrollViewer.ScrollChanged += ScrollViewerOnScrollChanged; | ||
|
|
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| _scrollViewer.ScrollChanged += ScrollViewerOnScrollChanged; | ||
| AssociatedObject.ItemContainerGenerator.ItemsChanged += ItemContainerGeneratorItemsChanged; | ||
| AssociatedObject.GotMouseCapture += AssociatedObject_GotMouseCapture; | ||
| AssociatedObject.LostMouseCapture += AssociatedObject_LostMouseCapture; | ||
| AssociatedObject.PreviewMouseWheel += AssociatedObject_PreviewMouseWheel; | ||
| } | ||
|
|
||
| AssociatedObject.ItemContainerGenerator.ItemsChanged += ItemContainerGeneratorItemsChanged; | ||
| AssociatedObject.GotMouseCapture += AssociatedObject_GotMouseCapture; | ||
| AssociatedObject.LostMouseCapture += AssociatedObject_LostMouseCapture; | ||
| AssociatedObject.PreviewMouseWheel += AssociatedObject_PreviewMouseWheel; | ||
| } | ||
| private void AssociatedObject_GotMouseCapture(object sender, MouseEventArgs e) | ||
| { | ||
| // User is actively interacting with listbox. Do not allow automatic scrolling to interfere with user experience. | ||
| _userInteracting = true; | ||
| _autoScroll = false; | ||
| } | ||
|
|
||
| private void AssociatedObject_GotMouseCapture(object sender, MouseEventArgs e) | ||
| private void AssociatedObject_LostMouseCapture(object sender, MouseEventArgs e) | ||
| { | ||
| // User is done interacting with control. | ||
| _userInteracting = false; | ||
| } | ||
|
|
||
| private void ScrollViewerOnScrollChanged(object sender, ScrollChangedEventArgs e) | ||
| { | ||
| if (_scrollViewer is null) | ||
| { | ||
| // User is actively interacting with listbox. Do not allow automatic scrolling to interfere with user experience. | ||
| _userInteracting = true; | ||
| _autoScroll = false; | ||
| return; | ||
| } | ||
|
|
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| private void AssociatedObject_LostMouseCapture(object sender, MouseEventArgs e) | ||
| // diff is exactly zero if the last item in the list is visible. This can occur because of scroll-bar drag, mouse-wheel, or keyboard event. | ||
| var diff = _scrollViewer.VerticalOffset - (_scrollViewer.ExtentHeight - _scrollViewer.ViewportHeight); | ||
|
|
||
| // User just wheeled; this event is called immediately afterwards. | ||
| if (_justWheeled && diff != 0d) | ||
| { | ||
| // User is done interacting with control. | ||
| _userInteracting = false; | ||
| _justWheeled = false; | ||
| _autoScroll = false; | ||
| return; | ||
| } | ||
|
|
||
| private void ScrollViewerOnScrollChanged(object sender, ScrollChangedEventArgs e) | ||
| if (diff == 0d) | ||
| { | ||
| if (_scrollViewer is null) | ||
| { | ||
| return; | ||
| } | ||
|
|
||
| // diff is exactly zero if the last item in the list is visible. This can occur because of scroll-bar drag, mouse-wheel, or keyboard event. | ||
| var diff = _scrollViewer.VerticalOffset - (_scrollViewer.ExtentHeight - _scrollViewer.ViewportHeight); | ||
|
|
||
| // User just wheeled; this event is called immediately afterwards. | ||
| if (_justWheeled && diff != 0d) | ||
| { | ||
| _justWheeled = false; | ||
| _autoScroll = false; | ||
| return; | ||
| } | ||
|
|
||
| if (diff == 0d) | ||
| { | ||
| // then assume user has finished with interaction and has indicated through this action that scrolling should continue automatically. | ||
| _autoScroll = true; | ||
| } | ||
| // then assume user has finished with interaction and has indicated through this action that scrolling should continue automatically. | ||
| _autoScroll = true; | ||
| } | ||
| } | ||
|
|
||
| private void ItemContainerGeneratorItemsChanged(object sender, ItemsChangedEventArgs e) | ||
| private void ItemContainerGeneratorItemsChanged(object sender, ItemsChangedEventArgs e) | ||
| { | ||
| if (e.Action == NotifyCollectionChangedAction.Add || e.Action == NotifyCollectionChangedAction.Reset) | ||
| { | ||
| if (e.Action == NotifyCollectionChangedAction.Add || e.Action == NotifyCollectionChangedAction.Reset) | ||
| // An item was added to the listbox, or listbox was cleared. | ||
| if (_autoScroll && !_userInteracting) | ||
| { | ||
| // An item was added to the listbox, or listbox was cleared. | ||
| if (_autoScroll && !_userInteracting) | ||
| { | ||
| // If automatic scrolling is turned on, scroll to the bottom to bring new item into view. | ||
| // Do not do this if the user is actively interacting with the listbox. | ||
| _scrollViewer?.ScrollToBottom(); | ||
| } | ||
| // If automatic scrolling is turned on, scroll to the bottom to bring new item into view. | ||
| // Do not do this if the user is actively interacting with the listbox. | ||
| _scrollViewer?.ScrollToBottom(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private void AssociatedObject_PreviewMouseWheel(object sender, MouseWheelEventArgs e) | ||
| { | ||
| // User wheeled the mouse. | ||
| // Cannot detect whether scroll viewer right at the bottom, because the scroll event has not occurred at this point. | ||
| // Same for bubbling event. | ||
| // Just indicated that the user mouse-wheeled, and that the scroll viewer should decide whether or not to stop autoscrolling. | ||
| _justWheeled = true; | ||
| } | ||
| private void AssociatedObject_PreviewMouseWheel(object sender, MouseWheelEventArgs e) | ||
| { | ||
| // User wheeled the mouse. | ||
| // Cannot detect whether scroll viewer right at the bottom, because the scroll event has not occurred at this point. | ||
| // Same for bubbling event. | ||
| // Just indicated that the user mouse-wheeled, and that the scroll viewer should decide whether or not to stop autoscrolling. | ||
| _justWheeled = true; | ||
| } | ||
| } |
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