improve:issue #332

Ink Canvas/Windows/TimerControl.xaml.cs

@@ -48,14 +48,138 @@ namespace Ink_Canvas.Windows
             // 监听主题变化事件
             SystemEvents.UserPreferenceChanged += SystemEvents_UserPreferenceChanged;
 
+            // 监听分辨率变化事件
+            SystemEvents.DisplaySettingsChanged += SystemEvents_DisplaySettingsChanged;
+
             // 监听卸载事件，清理资源
             Unloaded += TimerControl_Unloaded;
+
+            // 监听加载事件，设置UI大小
+            Loaded += TimerControl_Loaded;
+        }
+
+        private void SystemEvents_DisplaySettingsChanged(object sender, EventArgs e)
+        {
+            // 分辨率变化时重新计算大小
+            Application.Current.Dispatcher.BeginInvoke(new Action(() =>
+            {
+                UpdateTimerControlSize();
+            }), System.Windows.Threading.DispatcherPriority.Loaded);
+        }
+
+        private void MainWindow_DpiChanged(object sender, DpiChangedEventArgs e)
+        {
+            // DPI变化时重新计算大小
+            Application.Current.Dispatcher.BeginInvoke(new Action(() =>
+            {
+                UpdateTimerControlSize();
+            }), System.Windows.Threading.DispatcherPriority.Loaded);
+        }
+
+        private void TimerControl_Loaded(object sender, RoutedEventArgs e)
+        {
+            // 根据DPI和分辨率限制UI大小为屏幕的50%
+            UpdateTimerControlSize();
+
+            // 监听DPI变化事件（通过主窗口）
+            var mainWindow = Application.Current.MainWindow as MainWindow;
+            if (mainWindow != null)
+            {
+                mainWindow.DpiChanged += MainWindow_DpiChanged;
+            }
+        }
+
+        /// <summary>
+        /// 根据DPI和分辨率更新计时器控件大小，限制在屏幕大小的50%
+        /// </summary>
+        private void UpdateTimerControlSize()
+        {
+            try
+            {
+                // 获取主窗口
+                var mainWindow = Application.Current.MainWindow as MainWindow;
+                if (mainWindow == null) return;
+
+                // 获取DPI缩放因子
+                var source = PresentationSource.FromVisual(mainWindow);
+                double dpiScaleX = 1.0, dpiScaleY = 1.0;
+                if (source != null && source.CompositionTarget != null)
+                {
+                    var transform = source.CompositionTarget.TransformToDevice;
+                    dpiScaleX = transform.M11;
+                    dpiScaleY = transform.M22;
+                }
+
+                // 获取屏幕工作区域大小（考虑DPI）
+                double screenWidth = SystemParameters.WorkArea.Width / dpiScaleX;
+                double screenHeight = SystemParameters.WorkArea.Height / dpiScaleY;
+
+                // 计算最大尺寸（屏幕的50%）
+                double maxWidth = screenWidth * 0.5;
+                double maxHeight = screenHeight * 0.5;
+
+                // 保持宽高比（基于原始设计尺寸 900x500，宽高比约为 1.8:1）
+                double aspectRatio = 900.0 / 500.0;
+                double calculatedWidth = maxWidth;
+                double calculatedHeight = calculatedWidth / aspectRatio;
+
+                // 如果计算出的高度超过最大高度，则按高度计算
+                if (calculatedHeight > maxHeight)
+                {
+                    calculatedHeight = maxHeight;
+                    calculatedWidth = calculatedHeight * aspectRatio;
+                }
+
+                // 查找父容器（TimerContainer）
+                var parent = this.Parent as FrameworkElement;
+                if (parent == null)
+                {
+                    // 如果直接父元素不是FrameworkElement，尝试查找Border
+                    var visualParent = System.Windows.Media.VisualTreeHelper.GetParent(this);
+                    while (visualParent != null)
+                    {
+                        if (visualParent is FrameworkElement fe && fe.Name == "TimerContainer")
+                        {
+                            parent = fe;
+                            break;
+                        }
+                        visualParent = System.Windows.Media.VisualTreeHelper.GetParent(visualParent);
+                    }
+                }
+
+                if (parent != null)
+                {
+                    // 设置父容器大小
+                    parent.Width = calculatedWidth;
+                    parent.Height = calculatedHeight;
+
+                    // 更新Viewbox的MaxWidth和MaxHeight以确保内容正确缩放
+                    if (MainViewController != null)
+                    {
+                        // Viewbox会自动缩放，但我们需要确保它不会超过父容器
+                        MainViewController.MaxWidth = calculatedWidth - 40; // 减去Margin
+                        MainViewController.MaxHeight = calculatedHeight - 40;
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                LogHelper.WriteLogToFile($"更新计时器控件大小失败: {ex.Message}", LogHelper.LogType.Error);
+            }
         }
 
         private void TimerControl_Unloaded(object sender, RoutedEventArgs e)
         {
             // 取消订阅主题变化事件
             SystemEvents.UserPreferenceChanged -= SystemEvents_UserPreferenceChanged;
+            SystemEvents.DisplaySettingsChanged -= SystemEvents_DisplaySettingsChanged;
+
+            // 取消订阅DPI变化事件
+            var mainWindow = Application.Current.MainWindow as MainWindow;
+            if (mainWindow != null)
+            {
+                mainWindow.DpiChanged -= MainWindow_DpiChanged;
+            }
         }
 
         private void SystemEvents_UserPreferenceChanged(object sender, UserPreferenceChangedEventArgs e)