WIP

2024-01-17 17:16:50 +00:00
parent 86603a6567
commit 2f22c81384
21 changed files with 471 additions and 231 deletions
@@ -0,0 +1,110 @@
+using System.Runtime.InteropServices;
+using Windows.Win32;
+using Windows.Win32.Foundation;
+
+namespace Hyperbar.Windows.Interop;
+
+public class WindowSnapping
+{
+    private readonly nint hwnd;
+    private uint callback;
+
+    public WindowSnapping(IntPtr hwnd)
+    {
+        this.hwnd = hwnd;
+        InitializeAppBarWindow();
+    }
+
+    private enum AppBarMsg : int
+    {
+        ABM_NEW = 0,
+        ABM_REMOVE,
+        ABM_QUERYPOS,
+        ABM_SETPOS,
+        ABM_GETSTATE,
+        ABM_GETTASKBARPOS,
+        ABM_ACTIVATE,
+        ABM_GETAUTOHIDEBAR,
+        ABM_SETAUTOHIDEBAR,
+        ABM_WINDOWPOSCHANGED,
+        ABM_SETSTATE
+    }
+    public static WindowSnapping Create(IntPtr hwnd)
+    {
+        return new WindowSnapping(hwnd);
+    }
+
+    public void Snap(AppBarWindowPlacement placement, int size)
+    {
+        uint dpi = PInvoke.GetDpiForWindow(new HWND(hwnd));
+
+        double scalingFactor = dpi / 96d;
+        int actualSize = (int)(size * scalingFactor);
+
+        Screen screen = Screen.FromHandle(hwnd);
+
+        APPBARDATA32 appBarData = new();
+        appBarData.cbSize = (uint)Marshal.SizeOf(appBarData);
+        appBarData.hWnd = new HWND(hwnd);
+        appBarData.uEdge = (uint)placement;
+        appBarData.rc = new RECT
+        {
+            left = (int)screen.Bounds.Left,
+            top = (int)screen.Bounds.Top,
+            right = (int)screen.Bounds.Right,
+            bottom = (int)screen.Bounds.Bottom
+        };
+
+        PInvoke.SHAppBarMessage((int)AppBarMsg.ABM_QUERYPOS, ref appBarData);
+
+        switch (placement)
+        {
+            case AppBarWindowPlacement.Top:
+                appBarData.rc.bottom = appBarData.rc.top + actualSize;
+                break;
+            case AppBarWindowPlacement.Bottom:
+                appBarData.rc.top = appBarData.rc.bottom - actualSize;
+                break;
+            case AppBarWindowPlacement.Left:
+                appBarData.rc.right = appBarData.rc.left + actualSize;
+                break;
+            case AppBarWindowPlacement.Right:
+                appBarData.rc.left = appBarData.rc.right - actualSize;
+                break;
+            default: throw new NotSupportedException();
+        }
+
+        PInvoke.SHAppBarMessage((int)AppBarMsg.ABM_SETPOS, ref appBarData);
+
+        PInvoke.SetWindowPos(new HWND(hwnd), new HWND(),
+            appBarData.rc.left,
+            appBarData.rc.top,
+            appBarData.rc.right - appBarData.rc.left,
+            appBarData.rc.bottom - appBarData.rc.top, 0);
+    }
+
+    private void InitializeAppBarWindow()
+    {
+        if (Environment.Is64BitProcess)
+        {
+            APPBARDATA64 appBarData = new();
+            appBarData.cbSize = (uint)Marshal.SizeOf(appBarData);
+            appBarData.hWnd = new HWND(hwnd);
+
+            callback = PInvoke.RegisterWindowMessage("AppBarMessage64");
+            appBarData.uCallbackMessage = callback;
+            _ = PInvoke.SHAppBarMessage(0, ref appBarData);
+        }
+        else
+        {
+            APPBARDATA32 appBarData = new();
+            appBarData.cbSize = (uint)Marshal.SizeOf(appBarData);
+            appBarData.hWnd = new HWND(hwnd);
+
+            callback = PInvoke.RegisterWindowMessage("AppBarMessage32");
+            appBarData.uCallbackMessage = callback;
+
+            _ = PInvoke.SHAppBarMessage(0, ref appBarData);
+        }
+    }
+}