Bug 1035774 - Support dynamic input device changes for windows. r=aklotz

Note that this dynamic change will not work without a patch for bug 1478576
if user doesn't touch browser windows.

Differential Revision: https://phabricator.services.mozilla.com/D3301

widget/windows/InputDeviceUtils.cpp

@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim:set ts=2 sts=2 sw=2 et cin: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "InputDeviceUtils.h"
+
+#define INITGUID
+#include <dbt.h>
+#include <hidclass.h>
+#include <ntddmou.h>
+
+namespace mozilla {
+namespace widget {
+
+HDEVNOTIFY
+InputDeviceUtils::RegisterNotification(HWND aHwnd)
+{
+  DEV_BROADCAST_DEVICEINTERFACE filter = {};
+
+  filter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
+  filter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
+  // We only need notifications for mouse type devices.
+  filter.dbcc_classguid = GUID_DEVINTERFACE_MOUSE;
+  return RegisterDeviceNotification(aHwnd,
+                                    &filter,
+                                    DEVICE_NOTIFY_WINDOW_HANDLE);
+}
+
+void
+InputDeviceUtils::UnregisterNotification(HDEVNOTIFY aHandle)
+{
+  if (!aHandle) {
+    return;
+  }
+  UnregisterDeviceNotification(aHandle);
+}
+
+} // namespace widget
+} // namespace mozilla

widget/windows/InputDeviceUtils.h

@@ -0,0 +1,23 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sts=2 sw=2 et cin: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_widget_InputDeviceUtils_h__
+#define mozilla_widget_InputDeviceUtils_h__
+
+#include <windows.h>
+
+namespace mozilla {
+namespace widget {
+
+class InputDeviceUtils {
+public:
+  static HDEVNOTIFY RegisterNotification(HWND aHwnd);
+  static void UnregisterNotification(HDEVNOTIFY aHandle);
+};
+
+} // namespace widget
+} // namespace mozilla
+#endif // mozilla_widget_InputDeviceUtils_h__

widget/windows/moz.build

@@ -99,6 +99,11 @@ SOURCES += [
     'WinMouseScrollHandler.cpp',
 ]
 
+# Needs INITGUID and we don't allow INITGUID in unified sources since bug 970429.
+SOURCES += [
+    'InputDeviceUtils.cpp',
+]
+
 if CONFIG['NS_PRINTING']:
     UNIFIED_SOURCES += [
         'nsDeviceContextSpecWin.cpp',

widget/windows/nsWindow.cpp

@@ -77,6 +77,7 @@
 #include <wtsapi32.h>
 #include <process.h>
 #include <commctrl.h>
+#include <dbt.h>
 #include <unknwn.h>
 #include <psapi.h>
 
@@ -143,6 +144,7 @@
 #include "nsStyleConsts.h"
 #include "gfxConfig.h"
 #include "InProcessWinCompositorWidget.h"
+#include "InputDeviceUtils.h"
 #include "ScreenHelperWin.h"
 
 #include "nsIGfxInfo.h"
@@ -604,6 +606,7 @@ nsWindow::nsWindow(bool aIsChildWindow)
   mPaintDC              = nullptr;
   mPrevWndProc          = nullptr;
   mNativeDragTarget     = nullptr;
+  mDeviceNotifyHandle   = nullptr;
   mInDtor               = false;
   mIsVisible            = false;
   mIsTopWidgetWindow    = false;
@@ -848,6 +851,9 @@ nsWindow::Create(nsIWidget* aParent,
     NS_WARNING("nsWindow CreateWindowEx failed.");
     return NS_ERROR_FAILURE;
   }
+
+  mDeviceNotifyHandle = InputDeviceUtils::RegisterNotification(mWnd);
+
   // If mDefaultScale is set before mWnd has been set, it will have the scale of the
   // primary monitor, rather than the monitor that the window is actually on. For
   // non-popup windows this gets corrected by the WM_DPICHANGED message which resets
@@ -981,6 +987,9 @@ void nsWindow::Destroy()
    * delete the nsWindow. */
   ClearCachedResources();
 
+  InputDeviceUtils::UnregisterNotification(mDeviceNotifyHandle);
+  mDeviceNotifyHandle = nullptr;
+
   // The DestroyWindow function destroys the specified window. The function sends WM_DESTROY
   // and WM_NCDESTROY messages to the window to deactivate it and remove the keyboard focus
   // from it. The function also destroys the window's menu, flushes the thread message queue,
@@ -5344,6 +5353,22 @@ nsWindow::ProcessMessage(UINT msg, WPARAM& wParam, LPARAM& lParam,
     }
     break;
 
+    case WM_DEVICECHANGE:
+    {
+      if (wParam == DBT_DEVICEARRIVAL ||
+          wParam == DBT_DEVICEREMOVECOMPLETE) {
+        DEV_BROADCAST_HDR* hdr = reinterpret_cast<DEV_BROADCAST_HDR*>(lParam);
+        // Check dbch_devicetype explicitly since we will get other device types
+        // (e.g. DBT_DEVTYP_VOLUME) for some reasons even if we specify
+        // DBT_DEVTYP_DEVICEINTERFACE in the filter for
+        // RegisterDeviceNotification.
+        if (hdr->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE) {
+          NotifyThemeChanged();
+        }
+      }
+    }
+    break;
+
     case WM_NCCALCSIZE:
     {
       if (mCustomNonClient) {

widget/windows/nsWindow.h

@@ -537,6 +537,7 @@ protected:
   WNDPROC               mPrevWndProc;
   HBRUSH                mBrush;
   IMEContext            mDefaultIMC;
+  HDEVNOTIFY            mDeviceNotifyHandle;
   bool                  mIsTopWidgetWindow;
   bool                  mInDtor;
   bool                  mIsVisible;