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| 1 | +using System; |
| 2 | +using System.Windows; |
| 3 | +using System.Windows.Controls; |
| 4 | +using System.Windows.Input; |
| 5 | + |
| 6 | +namespace GitHub.InlineReviews.Tags |
| 7 | +{ |
| 8 | + class MouseEnterAndLeaveEventRouter<T> where T : FrameworkElement |
| 9 | + { |
| 10 | + T previousMouseOverElement; |
| 11 | + |
| 12 | + public void Add(UIElement sourceElement, UIElement targetElement) |
| 13 | + { |
| 14 | + sourceElement.MouseMove += (t, e) => MouseMove(targetElement, e); |
| 15 | + sourceElement.MouseLeave += (t, e) => MouseLeave(targetElement, e); |
| 16 | + } |
| 17 | + |
| 18 | + void MouseMove(object target, MouseEventArgs e) |
| 19 | + { |
| 20 | + T mouseOverElement = null; |
| 21 | + Action<T> visitAction = element => |
| 22 | + { |
| 23 | + mouseOverElement = element; |
| 24 | + }; |
| 25 | + |
| 26 | + var visitor = new Visitor(e, visitAction); |
| 27 | + visitor.Visit(target); |
| 28 | + |
| 29 | + if (mouseOverElement != previousMouseOverElement) |
| 30 | + { |
| 31 | + MouseLeave(previousMouseOverElement, e); |
| 32 | + MouseEnter(mouseOverElement, e); |
| 33 | + } |
| 34 | + } |
| 35 | + |
| 36 | + void MouseLeave(object target, MouseEventArgs e) |
| 37 | + { |
| 38 | + MouseLeave(previousMouseOverElement, e); |
| 39 | + } |
| 40 | + |
| 41 | + void MouseEnter(T element, MouseEventArgs e) |
| 42 | + { |
| 43 | + element?.RaiseEvent(new MouseEventArgs(e.MouseDevice, e.Timestamp) |
| 44 | + { |
| 45 | + RoutedEvent = Mouse.MouseEnterEvent, |
| 46 | + }); |
| 47 | + |
| 48 | + previousMouseOverElement = element; |
| 49 | + } |
| 50 | + |
| 51 | + void MouseLeave(T element, MouseEventArgs e) |
| 52 | + { |
| 53 | + element?.RaiseEvent(new MouseEventArgs(e.MouseDevice, e.Timestamp) |
| 54 | + { |
| 55 | + RoutedEvent = Mouse.MouseLeaveEvent, |
| 56 | + }); |
| 57 | + |
| 58 | + previousMouseOverElement = null; |
| 59 | + } |
| 60 | + |
| 61 | + class Visitor |
| 62 | + { |
| 63 | + MouseEventArgs mouseEventArgs; |
| 64 | + Action<T> action; |
| 65 | + |
| 66 | + internal Visitor(MouseEventArgs mouseEventArgs, Action<T> action) |
| 67 | + { |
| 68 | + this.mouseEventArgs = mouseEventArgs; |
| 69 | + this.action = action; |
| 70 | + } |
| 71 | + |
| 72 | + internal void Visit(object obj) |
| 73 | + { |
| 74 | + if (obj is Panel) |
| 75 | + { |
| 76 | + Visit((Panel)obj); |
| 77 | + return; |
| 78 | + } |
| 79 | + |
| 80 | + if (obj is T) |
| 81 | + { |
| 82 | + Visit((T)obj); |
| 83 | + return; |
| 84 | + } |
| 85 | + } |
| 86 | + |
| 87 | + internal void Visit(Panel panel) |
| 88 | + { |
| 89 | + foreach (var child in panel.Children) |
| 90 | + { |
| 91 | + Visit(child); |
| 92 | + } |
| 93 | + } |
| 94 | + |
| 95 | + internal void Visit(T element) |
| 96 | + { |
| 97 | + var point = mouseEventArgs.GetPosition(element); |
| 98 | + if (point.Y >= 0 && point.Y < element.ActualHeight) |
| 99 | + { |
| 100 | + action(element); |
| 101 | + } |
| 102 | + } |
| 103 | + } |
| 104 | + } |
| 105 | +} |
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