fix:issue #3

Ink Canvas/Helpers/ForegroundWindowInfo.cs

@@ -23,6 +23,26 @@ namespace Ink_Canvas.Helpers
         [DllImport("user32.dll")]
         private static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);
 
+        [DllImport("shell32.dll")]
+        private static extern IntPtr SHAppBarMessage(uint dwMessage, ref APPBARDATA pData);
+
+        [DllImport("user32.dll")]
+        private static extern int SystemParametersInfo(uint uiAction, uint uiParam, IntPtr pvParam, uint fWinIni);
+
+        private const uint ABM_GETTASKBARPOS = 0x00000005;
+        private const int SPI_GETWORKAREA = 0x0030;
+
+        [StructLayout(LayoutKind.Sequential)]
+        private struct APPBARDATA
+        {
+            public int cbSize;
+            public IntPtr hWnd;
+            public uint uCallbackMessage;
+            public uint uEdge;
+            public RECT rc;
+            public IntPtr lParam;
+        }
+
         [StructLayout(LayoutKind.Sequential)]
         public struct RECT {
             public int Left;
@@ -34,6 +54,60 @@ namespace Ink_Canvas.Helpers
             public int Height => Bottom - Top;
         }
 
+        /// <summary>
+        /// 获取Windows任务栏的高度（仅计算任务栏，不包括其他应用的停靠栏）
+        /// </summary>
+        /// <param name="screen">当前屏幕</param>
+        /// <param name="dpiScaleY">DPI缩放Y值</param>
+        /// <returns>任务栏高度</returns>
+        public static double GetTaskbarHeight(System.Windows.Forms.Screen screen, double dpiScaleY)
+        {
+            try
+            {
+                // 创建APPBARDATA结构
+                var abd = new APPBARDATA();
+                abd.cbSize = Marshal.SizeOf(abd);
+
+                // 获取任务栏信息
+                IntPtr result = SHAppBarMessage(ABM_GETTASKBARPOS, ref abd);
+                if (result != IntPtr.Zero)
+                {
+                    // 获取当前屏幕的工作区
+                    RECT workArea = new RECT();
+                    SystemParametersInfo(SPI_GETWORKAREA, 0, Marshal.AllocHGlobal(Marshal.SizeOf(workArea)), 0);
+
+                    // 根据任务栏位置计算高度
+                    int taskbarHeight = 0;
+
+                    // 任务栏的uEdge: 0=左, 1=上, 2=右, 3=下
+                    switch (abd.uEdge)
+                    {
+                        case 1: // 上
+                            taskbarHeight = abd.rc.Height;
+                            break;
+                        case 3: // 下
+                            taskbarHeight = abd.rc.Height;
+                            break;
+                        case 0: // 左
+                        case 2: // 右
+                            // 水平任务栏不影响高度
+                            taskbarHeight = 0;
+                            break;
+                    }
+
+                    // 考虑DPI缩放
+                    return taskbarHeight / dpiScaleY;
+                }
+            }
+            catch (Exception ex)
+            {
+                Debug.WriteLine($"获取任务栏高度出错: {ex.Message}");
+            }
+
+            // 如果获取失败，回退到通用方法
+            return (screen.Bounds.Height - screen.WorkingArea.Height) / dpiScaleY;
+        }
+
         public static string WindowTitle() {
             IntPtr foregroundWindowHandle = GetForegroundWindow();
 

Ink Canvas/MainWindow_cs/MW_FloatingBarIcons.cs

@@ -1078,8 +1078,8 @@ namespace Ink_Canvas {
                 var windowHandle = new WindowInteropHelper(this).Handle;
                 var screen = System.Windows.Forms.Screen.FromHandle(windowHandle);
                 double screenWidth = screen.Bounds.Width / dpiScaleX, screenHeight = screen.Bounds.Height / dpiScaleY;
-                var toolbarHeight = SystemParameters.PrimaryScreenHeight - SystemParameters.FullPrimaryScreenHeight -
+                // 仅计算Windows任务栏高度，不考虑其他程序对工作区的影响
-                                    SystemParameters.WindowCaptionHeight;
+                var toolbarHeight = ForegroundWindowInfo.GetTaskbarHeight(screen, dpiScaleY);
                 pos.X = (screenWidth - ViewboxFloatingBar.ActualWidth * ViewboxFloatingBarScaleTransform.ScaleX) / 2;
 
                 if (PosXCaculatedWithTaskbarHeight == false)
@@ -1141,8 +1141,8 @@ namespace Ink_Canvas {
                 var windowHandle = new WindowInteropHelper(this).Handle;
                 var screen = System.Windows.Forms.Screen.FromHandle(windowHandle);
                 double screenWidth = screen.Bounds.Width / dpiScaleX, screenHeight = screen.Bounds.Height / dpiScaleY;
-                var toolbarHeight = SystemParameters.PrimaryScreenHeight - SystemParameters.FullPrimaryScreenHeight -
+                // 仅计算Windows任务栏高度，不考虑其他程序对工作区的影响
-                                    SystemParameters.WindowCaptionHeight;
+                var toolbarHeight = ForegroundWindowInfo.GetTaskbarHeight(screen, dpiScaleY);
                 pos.X = (screenWidth - ViewboxFloatingBar.ActualWidth * ViewboxFloatingBarScaleTransform.ScaleX) / 2;
 
                 pos.Y = screenHeight - ViewboxFloatingBar.ActualHeight * ViewboxFloatingBarScaleTransform.ScaleY -
@@ -1184,8 +1184,8 @@ namespace Ink_Canvas {
                 var windowHandle = new WindowInteropHelper(this).Handle;
                 var screen = System.Windows.Forms.Screen.FromHandle(windowHandle);
                 double screenWidth = screen.Bounds.Width / dpiScaleX, screenHeight = screen.Bounds.Height / dpiScaleY;
-                var toolbarHeight = SystemParameters.PrimaryScreenHeight - SystemParameters.FullPrimaryScreenHeight -
+                // 仅计算Windows任务栏高度，不考虑其他程序对工作区的影响
-                                    SystemParameters.WindowCaptionHeight;
+                var toolbarHeight = ForegroundWindowInfo.GetTaskbarHeight(screen, dpiScaleY);
                 pos.X = (screenWidth - ViewboxFloatingBar.ActualWidth * ViewboxFloatingBarScaleTransform.ScaleX) / 2;
 
                 pos.Y = screenHeight - 55 * ViewboxFloatingBarScaleTransform.ScaleY;