new menu items and bindings to open mpv.conf and input.conf with a text editor

src/MpvNet.Windows/Help/WinApiHelp.cs

@@ -0,0 +1,126 @@
+
+using System.Drawing;
+using System.Runtime.InteropServices;
+using System.Text;
+
+using static MpvNet.Windows.Native.WinApi;
+
+namespace MpvNet.Windows.Help;
+
+public class WinApiHelp
+{
+    public static Version WindowsTen1607 { get; } = new Version(10, 0, 14393); // Windows 10 1607
+
+    public static int GetResizeBorder(int v)
+    {
+        switch (v)
+        {
+            case 1 /* WMSZ_LEFT        */ : return 3;
+            case 3 /* WMSZ_TOP         */ : return 2;
+            case 2 /* WMSZ_RIGHT       */ : return 3;
+            case 6 /* WMSZ_BOTTOM      */ : return 2;
+            case 4 /* WMSZ_TOPLEFT     */ : return 1;
+            case 5 /* WMSZ_TOPRIGHT    */ : return 1;
+            case 7 /* WMSZ_BOTTOMLEFT  */ : return 3;
+            case 8 /* WMSZ_BOTTOMRIGHT */ : return 3;
+            default: return -1;
+        }
+    }
+
+    public static void SubtractWindowBorders(IntPtr hwnd, ref Rect rc, int dpi)
+    {
+        Rect r = new Rect(0, 0, 0, 0);
+        AddWindowBorders(hwnd, ref r, dpi);
+        rc.Left -= r.Left;
+        rc.Top -= r.Top;
+        rc.Right -= r.Right;
+        rc.Bottom -= r.Bottom;
+    }
+
+    public static void AddWindowBorders(IntPtr hwnd, ref Rect rc, int dpi)
+    {
+        uint windowStyle = (uint)GetWindowLong(hwnd, -16); // GWL_STYLE
+        uint windowStyleEx = (uint)GetWindowLong(hwnd, -20); // GWL_EXSTYLE
+
+        if (Environment.OSVersion.Version >= WindowsTen1607)
+            AdjustWindowRectExForDpi(ref rc, windowStyle, false, windowStyleEx, (uint)dpi);
+        else
+            AdjustWindowRect(ref rc, windowStyle, false);
+    }
+
+    public static Rectangle GetWorkingArea(IntPtr handle, Rectangle workingArea)
+    {
+        if (handle != IntPtr.Zero && GetDwmWindowRect(handle, out Rect dwmRect) &&
+            GetWindowRect(handle, out Rect rect))
+        {
+            int left = workingArea.Left;
+            int top = workingArea.Top;
+            int right = workingArea.Right;
+            int bottom = workingArea.Bottom;
+
+            left += rect.Left - dwmRect.Left;
+            top -= rect.Top - dwmRect.Top;
+            right -= dwmRect.Right - rect.Right;
+            bottom -= dwmRect.Bottom - rect.Bottom;
+
+            return new Rectangle(left, top, right - left, bottom - top);
+        }
+
+        return workingArea;
+    }
+
+    public static bool GetDwmWindowRect(IntPtr handle, out Rect rect)
+    {
+        const uint DWMWA_EXTENDED_FRAME_BOUNDS = 9;
+
+        return 0 == DwmGetWindowAttribute(handle, DWMWA_EXTENDED_FRAME_BOUNDS,
+            out rect, (uint)Marshal.SizeOf<Rect>());
+    }
+
+    public static IntPtr GetWindowLong(IntPtr hWnd, int nIndex)
+    {
+        if (IntPtr.Size == 8)
+            return GetWindowLongPtr(hWnd, nIndex);
+        else
+            return GetWindowLong32(hWnd, nIndex);
+    }
+
+    public static IntPtr SetWindowLong(IntPtr hWnd, int nIndex, uint dwNewLong)
+    {
+        if (IntPtr.Size == 8)
+            return SetWindowLongPtr(hWnd, nIndex, dwNewLong);
+        else
+            return SetWindowLong32(hWnd, nIndex, dwNewLong);
+    }
+
+    public static string GetAppPathForExtension(params string[] extensions)
+    {
+        foreach (string it in extensions)
+        {
+            string extension = it;
+
+            if (!extension.StartsWith("."))
+                extension = "." + extension;
+
+            uint c = 0U;
+
+            if (AssocQueryString(0x40, 2, extension, null, null, ref c) == 1)
+            {
+                if (c > 0L)
+                {
+                    var sb = new StringBuilder((int)c);
+
+                    if (0 == AssocQueryString(0x40, 2, extension, default, sb, ref c))
+                    {
+                        string ret = sb.ToString();
+
+                        if (File.Exists(ret))
+                            return ret;
+                    }
+                }
+            }
+        }
+
+        return "";
+    }
+}