138 lines
4.3 KiB
C#
138 lines
4.3 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.Media;
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using System.Windows.Threading;
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using InkCanvasForClass.PluginSdk;
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namespace InkCanvasForClass.SamplePlugins
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{
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/// <summary>
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/// 示例插件：在当前 <see cref="InkCanvas"/> 右上角叠加显示实时时钟（不拦截笔触命中）。
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/// </summary>
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public sealed class ClockOverlayPlugin : InkCanvasPluginBase
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{
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public override string Id => "inkcanvas.sample.clock-overlay";
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public override string Name => "画布时钟示例";
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public override string Description => "在画布右上角显示当前时间（HH:mm:ss）";
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public override Version Version => new Version(1, 0, 0);
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public override string Author => "ICC CE Sample";
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private Border _host;
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private TextBlock _timeText;
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private DispatcherTimer _timer;
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private System.Windows.Controls.InkCanvas _canvas;
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private SizeChangedEventHandler _sizeHandler;
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public override void Start()
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{
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base.Start();
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var mw = Context?.MainWindow;
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var canvas = Context?.CurrentCanvas as System.Windows.Controls.InkCanvas;
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if (mw == null || canvas == null)
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{
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return;
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}
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mw.Dispatcher.Invoke(() =>
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{
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_canvas = canvas;
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_host = new Border
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{
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Background = new SolidColorBrush(Color.FromArgb(170, 32, 32, 36)),
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CornerRadius = new CornerRadius(8),
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Padding = new Thickness(12, 8, 12, 8),
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IsHitTestVisible = false
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};
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_timeText = new TextBlock
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{
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FontSize = 24,
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FontWeight = FontWeights.SemiBold,
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Foreground = Brushes.White,
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FontFamily = new FontFamily("Segoe UI, Microsoft YaHei UI")
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};
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_host.Child = _timeText;
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Panel.SetZIndex(_host, 10050);
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_canvas.Children.Add(_host);
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_sizeHandler = (s, e) => Reposition();
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_canvas.SizeChanged += _sizeHandler;
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Reposition();
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_timer = new DispatcherTimer { Interval = TimeSpan.FromSeconds(1) };
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_timer.Tick += (_, __) => Tick();
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_timer.Start();
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Tick();
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});
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}
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private void Tick()
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{
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if (_timeText != null)
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{
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_timeText.Text = DateTime.Now.ToString("HH:mm:ss");
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}
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}
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private void Reposition()
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{
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if (_canvas == null || _host == null)
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{
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return;
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}
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_host.UpdateLayout();
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var left = Math.Max(8, _canvas.ActualWidth - _host.ActualWidth - 20);
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InkCanvas.SetLeft(_host, left);
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InkCanvas.SetTop(_host, 20);
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}
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public override void Stop()
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{
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var mw = Context?.MainWindow;
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if (mw != null && (_canvas != null || _host != null))
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{
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mw.Dispatcher.Invoke(() =>
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{
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try
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{
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if (_timer != null)
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{
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_timer.Stop();
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_timer = null;
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}
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if (_canvas != null && _sizeHandler != null)
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{
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_canvas.SizeChanged -= _sizeHandler;
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_sizeHandler = null;
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}
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if (_canvas != null && _host != null && _canvas.Children.Contains(_host))
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{
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_canvas.Children.Remove(_host);
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}
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}
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catch
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{
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// 避免卸载时异常影响宿主
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}
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finally
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{
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_host = null;
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_timeText = null;
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_canvas = null;
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}
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});
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}
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base.Stop();
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}
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}
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}
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