[SNDVOL32] Add the tray volume dialog

- Add the tray volume dialog (run "sndvol32 /t").
- Add a simple command line parser.

base/applications/sndvol32/tray.c

@@ -0,0 +1,71 @@
+/*
+ * COPYRIGHT:   See COPYING in the top level directory
+ * PROJECT:     ReactOS Sound Volume Control
+ * FILE:        base/applications/sndvol32/tray.c
+ * PROGRAMMERS: Eric Kohl <eric.kohl@reactos.org>
+ */
+
+#include "sndvol32.h"
+
+static VOID
+OnTrayInitDialog(
+    HWND hwnd,
+    WPARAM wParam,
+    LPARAM lParam)
+{
+    POINT ptCursor;
+    RECT rcWindow;
+    RECT rcScreen;
+    LONG x, y, cx, cy;
+
+    GetCursorPos(&ptCursor);
+
+    GetWindowRect(hwnd, &rcWindow);
+
+    GetWindowRect(GetDesktopWindow(), &rcScreen);
+
+    cx = rcWindow.right - rcWindow.left;
+    cy = rcWindow.bottom - rcWindow.top;
+
+    if (ptCursor.y + cy > rcScreen.bottom)
+        y = ptCursor.y - cy;
+    else
+        y = ptCursor.y;
+
+    if (ptCursor.x + cx > rcScreen.right)
+        x = ptCursor.x - cx;
+    else
+        x = ptCursor.x;
+
+    SetWindowPos(hwnd, HWND_TOPMOST, x, y, 0, 0, SWP_NOSIZE);
+
+    /* Disable the controls for now */
+    EnableWindow(GetDlgItem(hwnd, IDC_LINE_SLIDER_VERT), FALSE);
+    EnableWindow(GetDlgItem(hwnd, IDC_LINE_SWITCH), FALSE);
+}
+
+
+INT_PTR
+CALLBACK
+TrayDlgProc(
+    HWND hwndDlg,
+    UINT uMsg,
+    WPARAM wParam,
+    LPARAM lParam)
+{
+    switch (uMsg)
+    {
+        case WM_INITDIALOG:
+            OnTrayInitDialog(hwndDlg, wParam, lParam);
+            break;
+
+        case WM_ACTIVATE:
+            if (LOWORD(wParam) == WA_INACTIVE)
+                EndDialog(hwndDlg, IDOK);
+            break;
+    }
+
+    return 0;
+}
+
+/* EOF */