81 lines
3.0 KiB
C#
81 lines
3.0 KiB
C#
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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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namespace SHH.CameraDashboard;
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public static class TouchBehavior
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{
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//原有 Action 属性保持不变...
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public static readonly DependencyProperty ActionProperty =
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DependencyProperty.RegisterAttached("Action", typeof(PtzAction?), typeof(TouchBehavior), new PropertyMetadata(null, OnActionChanged));
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public static PtzAction? GetAction(DependencyObject obj) => (PtzAction?)obj.GetValue(ActionProperty);
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public static void SetAction(DependencyObject obj, PtzAction? value) => obj.SetValue(ActionProperty, value);
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// ★★★ [新增] 私有附加属性，用于记录“是否处于按下状态” ★★★
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private static readonly DependencyProperty IsActiveProperty =
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DependencyProperty.RegisterAttached("IsActive", typeof(bool), typeof(TouchBehavior), new PropertyMetadata(false));
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private static bool GetIsActive(DependencyObject obj) => (bool)obj.GetValue(IsActiveProperty);
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private static void SetIsActive(DependencyObject obj, bool value) => obj.SetValue(IsActiveProperty, value);
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private static void OnActionChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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if (d is Button btn)
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{
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btn.PreviewMouseDown -= Btn_PreviewMouseDown;
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btn.PreviewMouseUp -= Btn_PreviewMouseUp;
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btn.MouseLeave -= Btn_PreviewMouseUp;
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if (e.NewValue != null)
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{
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btn.PreviewMouseDown += Btn_PreviewMouseDown;
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btn.PreviewMouseUp += Btn_PreviewMouseUp;
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btn.MouseLeave += Btn_PreviewMouseUp;
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}
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}
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}
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private static void Btn_PreviewMouseDown(object sender, MouseButtonEventArgs e)
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{
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if (sender is Button btn && btn.DataContext is CameraPtzViewModel vm)
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{
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var action = GetAction(btn);
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if (action.HasValue && vm.StartCommand.CanExecute(action.Value))
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{
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// 1. 标记为活跃状态
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SetIsActive(btn, true);
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// 2. 执行开始命令
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vm.StartCommand.Execute(action.Value);
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// (可选) 捕获鼠标，防止快速拖出窗口丢失 MouseUp
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btn.CaptureMouse();
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}
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}
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}
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private static void Btn_PreviewMouseUp(object sender, MouseEventArgs e)
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{
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if (sender is Button btn && btn.DataContext is CameraPtzViewModel vm)
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{
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// ★★★ [核心修改] 只有之前标记为活跃，才执行停止 ★★★
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if (GetIsActive(btn))
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{
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var action = GetAction(btn);
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if (action.HasValue && vm.StopCommand.CanExecute(action.Value))
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{
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vm.StopCommand.Execute(action.Value);
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}
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// 重置状态
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SetIsActive(btn, false);
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// 释放鼠标
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btn.ReleaseMouseCapture();
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}
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}
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}
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}
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