init

2021-02-05 01:39:51 +00:00
parent 666067a36c
commit 45a9eb9cd2
73 changed files with 2669 additions and 0 deletions
@@ -0,0 +1,118 @@
+using Microsoft.Windows.Sdk;
+using NotificationFlyout.Wpf.UI.Extensions;
+using System;
+using System.Runtime.InteropServices;
+using System.Windows;
+using System.Windows.Interop;
+
+namespace NotificationFlyout.Wpf.UI.Helpers
+{
+    public class TaskbarHelper
+    {
+        private const string ShellTrayHandleName = "Shell_TrayWnd";
+
+        private const int SPI_SETWORKAREA = 0x002F;
+
+        private const int WSETTINGCHANGE = 0x001A;
+
+        private static readonly uint WTASKBARCREATED = PInvoke.RegisterWindowMessage("TaskbarCreated");
+
+        private TaskbarHelper(Window window)
+        {
+            var handle = window.GetHandle();
+
+            var source = HwndSource.FromHwnd(handle);
+            source.AddHook(new HwndSourceHook(WndProc));
+        }
+
+        public event EventHandler TaskbarChanged;
+
+        private enum AppBarEdge : uint
+        {
+            Left = 0,
+            Top = 1,
+            Right = 2,
+            Bottom = 3
+        }
+
+        private enum AppBarMessage : uint
+        {
+            New = 0x00000000,
+            Remove = 0x00000001,
+            QueryPos = 0x00000002,
+            SetPos = 0x00000003,
+            GetState = 0x00000004,
+            GetTaskbarPos = 0x00000005,
+            Activate = 0x00000006,
+            GetAutoHideBar = 0x00000007,
+            SetAutoHideBar = 0x00000008,
+            WindowPosChanged = 0x00000009,
+            SetState = 0x0000000A,
+        }
+
+        public static TaskbarHelper Create(Window window)
+        {
+            return new TaskbarHelper(window);
+        }
+
+        public TaskbarState GetCurrentState()
+        {
+            var handle = GetSystemTrayHandle();
+            var state = new TaskbarState
+            {
+                Screen = Screen.FromHandle(handle)
+            };
+
+            var appBarData = GetAppBarData(handle);
+            GetAppBarPosition(ref appBarData);
+
+            state.Rect = appBarData.rect.ToRect();
+            state.Position = (TaskbarPosition)appBarData.uEdge;
+
+            return state;
+        }
+
+        private static IntPtr GetSystemTrayHandle()
+        {
+            return WindowHelper.GetHandle(ShellTrayHandleName);
+        }
+
+        private AppBarData GetAppBarData(IntPtr handle)
+        {
+            return new AppBarData
+            {
+                cbSize = (uint)Marshal.SizeOf(typeof(AppBarData)),
+                hWnd = handle
+            };
+        }
+
+        [StructLayout(LayoutKind.Sequential)]
+        private struct AppBarData
+        {
+            public uint cbSize;
+            public IntPtr hWnd;
+            public uint uCallbackMessage;
+            public AppBarEdge uEdge;
+            public RECT rect;
+            public int lParam;
+        }
+
+        [DllImport("shell32.dll", SetLastError = true)]
+        private static extern IntPtr SHAppBarMessage(AppBarMessage dwMessage, ref AppBarData pData);
+
+        private void GetAppBarPosition(ref AppBarData appBarData)
+        {
+            SHAppBarMessage(AppBarMessage.GetTaskbarPos, ref appBarData);
+        }
+
+        private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
+        {
+            if (msg == WTASKBARCREATED || msg == WSETTINGCHANGE && (int)wParam == SPI_SETWORKAREA)
+            {
+                TaskbarChanged?.Invoke(this, EventArgs.Empty);
+            }
+
+            return (IntPtr)(int)PInvoke.DefWindowProc((HWND)hwnd, (uint)msg, (WPARAM)(UIntPtr)(uint)wParam, (LPARAM)lParam);
+        }
+    }
+}