78 lines
2.9 KiB
C#
78 lines
2.9 KiB
C#
using System;
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using System.Linq;
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using System.Windows;
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using System.Windows.Interop;
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using System.Windows.Media;
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using HandyControl.Tools.Interop;
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namespace HandyControl.Tools
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{
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public static class VisualHelper
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{
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internal static VisualStateGroup TryGetVisualStateGroup(DependencyObject d, string groupName)
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{
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var root = GetImplementationRoot(d);
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if (root == null) return null;
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return VisualStateManager
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.GetVisualStateGroups(root)?
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.OfType<VisualStateGroup>()
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.FirstOrDefault(group => string.CompareOrdinal(groupName, group.Name) == 0);
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}
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internal static FrameworkElement GetImplementationRoot(DependencyObject d) =>
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1 == VisualTreeHelper.GetChildrenCount(d)
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? VisualTreeHelper.GetChild(d, 0) as FrameworkElement
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: null;
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public static T GetChild<T>(DependencyObject d) where T : DependencyObject
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{
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if (d == null) return default;
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if (d is T t) return t;
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for (var i = 0; i < VisualTreeHelper.GetChildrenCount(d); i++)
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{
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var child = VisualTreeHelper.GetChild(d, i);
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var result = GetChild<T>(child);
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if (result != null) return result;
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}
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return default;
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}
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public static T GetParent<T>(DependencyObject d) where T : DependencyObject =>
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d switch
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{
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null => default,
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T t => t,
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Window _ => null,
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_ => GetParent<T>(VisualTreeHelper.GetParent(d))
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};
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public static IntPtr GetHandle(this Visual visual) => (PresentationSource.FromVisual(visual) as HwndSource)?.Handle ?? IntPtr.Zero;
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internal static void HitTestVisibleElements(Visual visual, HitTestResultCallback resultCallback, HitTestParameters parameters) =>
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VisualTreeHelper.HitTest(visual, ExcludeNonVisualElements, resultCallback, parameters);
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private static HitTestFilterBehavior ExcludeNonVisualElements(DependencyObject potentialHitTestTarget)
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{
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if (!(potentialHitTestTarget is Visual)) return HitTestFilterBehavior.ContinueSkipSelfAndChildren;
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if (!(potentialHitTestTarget is UIElement uIElement) || uIElement.IsVisible && uIElement.IsEnabled)
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return HitTestFilterBehavior.Continue;
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return HitTestFilterBehavior.ContinueSkipSelfAndChildren;
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}
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internal static bool ModifyStyle(IntPtr hWnd, int styleToRemove, int styleToAdd)
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{
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var windowLong = InteropMethods.GetWindowLong(hWnd, InteropValues.GWL.STYLE);
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var num = (windowLong & ~styleToRemove) | styleToAdd;
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if (num == windowLong) return false;
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InteropMethods.SetWindowLong(hWnd, InteropValues.GWL.STYLE, num);
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return true;
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}
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}
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}
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