101 lines
3.8 KiB
C#
101 lines
3.8 KiB
C#
using System;
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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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using HandyControl.Data;
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using HandyControl.Tools;
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namespace HandyControl.Controls;
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public class ScrollViewerAttach
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{
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public static readonly DependencyProperty AutoHideProperty = DependencyProperty.RegisterAttached(
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"AutoHide", typeof(bool), typeof(ScrollViewerAttach), new FrameworkPropertyMetadata(ValueBoxes.TrueBox, FrameworkPropertyMetadataOptions.Inherits));
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public static void SetAutoHide(DependencyObject element, bool value)
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=> element.SetValue(AutoHideProperty, ValueBoxes.BooleanBox(value));
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public static bool GetAutoHide(DependencyObject element)
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=> (bool) element.GetValue(AutoHideProperty);
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public static readonly DependencyProperty OrientationProperty = DependencyProperty.RegisterAttached(
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"Orientation", typeof(Orientation), typeof(ScrollViewerAttach), new FrameworkPropertyMetadata(ValueBoxes.VerticalBox, FrameworkPropertyMetadataOptions.Inherits, OnOrientationChanged));
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private static void OnOrientationChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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if (d is ScrollViewer)
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{
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return;
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}
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if (d is System.Windows.Controls.ScrollViewer scrollViewer)
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{
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if ((Orientation) e.NewValue == Orientation.Horizontal)
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{
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scrollViewer.PreviewMouseWheel += ScrollViewerPreviewMouseWheel;
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}
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else
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{
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scrollViewer.PreviewMouseWheel -= ScrollViewerPreviewMouseWheel;
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}
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}
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void ScrollViewerPreviewMouseWheel(object sender, MouseWheelEventArgs args)
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{
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var scrollViewerNative = (System.Windows.Controls.ScrollViewer) sender;
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scrollViewerNative.ScrollToHorizontalOffset(Math.Min(Math.Max(0, scrollViewerNative.HorizontalOffset - args.Delta), scrollViewerNative.ScrollableWidth));
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args.Handled = true;
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}
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}
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public static void SetOrientation(DependencyObject element, Orientation value)
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=> element.SetValue(OrientationProperty, ValueBoxes.OrientationBox(value));
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public static Orientation GetOrientation(DependencyObject element)
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=> (Orientation) element.GetValue(OrientationProperty);
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public static readonly DependencyProperty IsDisabledProperty = DependencyProperty.RegisterAttached(
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"IsDisabled", typeof(bool), typeof(ScrollViewerAttach), new PropertyMetadata(ValueBoxes.FalseBox, OnIsDisabledChanged));
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private static void OnIsDisabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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if (d is UIElement element)
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{
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if ((bool) e.NewValue)
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{
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element.PreviewMouseWheel += ScrollViewerPreviewMouseWheel;
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}
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else
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{
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element.PreviewMouseWheel -= ScrollViewerPreviewMouseWheel;
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}
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}
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void ScrollViewerPreviewMouseWheel(object sender, MouseWheelEventArgs args)
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{
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if (args.Handled)
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{
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return;
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}
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args.Handled = true;
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if (VisualHelper.GetParent<System.Windows.Controls.ScrollViewer>((UIElement) sender) is { } scrollViewer)
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{
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scrollViewer.RaiseEvent(new MouseWheelEventArgs(args.MouseDevice, args.Timestamp, args.Delta)
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{
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RoutedEvent = UIElement.MouseWheelEvent,
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Source = sender
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});
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}
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}
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}
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public static void SetIsDisabled(DependencyObject element, bool value)
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=> element.SetValue(IsDisabledProperty, ValueBoxes.BooleanBox(value));
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public static bool GetIsDisabled(DependencyObject element)
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=> (bool) element.GetValue(IsDisabledProperty);
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}
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