ui/gfx/win/hwnd_util.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/gfx/win/hwnd_util.h"
   6
   7 #include "base/i18n/rtl.h"
   8 #include "base/strings/string_util.h"
   9 #include "base/tracked_objects.h"
  10 #include "base/win/metro.h"
  11 #include "base/win/win_util.h"
  12 #include "ui/gfx/geometry/point.h"
  13 #include "ui/gfx/geometry/rect.h"
  14 #include "ui/gfx/geometry/size.h"
  15
  16 namespace gfx {
  17
  18 namespace {
  19
  20 // Adjust the window to fit.
  21 void AdjustWindowToFit(HWND hwnd, const RECT& bounds, bool fit_to_monitor) {
  22   if (fit_to_monitor) {
  23     // Get the monitor.
  24     HMONITOR hmon = MonitorFromRect(&bounds, MONITOR_DEFAULTTONEAREST);
  25     if (hmon) {
  26       MONITORINFO mi;
  27       mi.cbSize = sizeof(mi);
  28       GetMonitorInfo(hmon, &mi);
  29       Rect window_rect(bounds);
  30       Rect monitor_rect(mi.rcWork);
  31       Rect new_window_rect = window_rect;
  32       new_window_rect.AdjustToFit(monitor_rect);
  33       if (new_window_rect != window_rect) {
  34         // Window doesn't fit on monitor, move and possibly resize.
  35         SetWindowPos(hwnd, 0, new_window_rect.x(), new_window_rect.y(),
  36                      new_window_rect.width(), new_window_rect.height(),
  37                      SWP_NOACTIVATE | SWP_NOZORDER);
  38         return;
  39       }
  40       // Else fall through.
  41     } else {
  42       NOTREACHED() << "Unable to find default monitor";
  43       // Fall through.
  44     }
  45   }  // Else fall through.
  46
  47   // The window is not being fit to monitor, or the window fits on the monitor
  48   // as is, or we have no monitor info; reset the bounds.
  49   ::SetWindowPos(hwnd, 0, bounds.left, bounds.top,
  50                  bounds.right - bounds.left, bounds.bottom - bounds.top,
  51                  SWP_NOACTIVATE | SWP_NOZORDER);
  52 }
  53
  54 // Turn off optimizations for these functions so they show up in crash reports.
  55 MSVC_DISABLE_OPTIMIZE();
  56
  57 void CrashOutOfMemory() {
  58   PLOG(FATAL);
  59 }
  60
  61 void CrashAccessDenied() {
  62   PLOG(FATAL);
  63 }
  64
  65 // Crash isn't one of the ones we commonly see.
  66 void CrashOther() {
  67   PLOG(FATAL);
  68 }
  69
  70 MSVC_ENABLE_OPTIMIZE();
  71
  72 }  // namespace
  73
  74 base::string16 GetClassName(HWND window) {
  75   // GetClassNameW will return a truncated result (properly null terminated) if
  76   // the given buffer is not large enough.  So, it is not possible to determine
  77   // that we got the entire class name if the result is exactly equal to the
  78   // size of the buffer minus one.
  79   DWORD buffer_size = MAX_PATH;
  80   while (true) {
  81     std::wstring output;
  82     DWORD size_ret =
  83         GetClassNameW(window, WriteInto(&output, buffer_size), buffer_size);
  84     if (size_ret == 0)
  85       break;
  86     if (size_ret < (buffer_size - 1)) {
  87       output.resize(size_ret);
  88       return output;
  89     }
  90     buffer_size *= 2;
  91   }
  92   return std::wstring();  // error
  93 }
  94
  95 #pragma warning(push)
  96 #pragma warning(disable:4312 4244)
  97
  98 WNDPROC SetWindowProc(HWND hwnd, WNDPROC proc) {
  99   // The reason we don't return the SetwindowLongPtr() value is that it returns
 100   // the orignal window procedure and not the current one. I don't know if it is
 101   // a bug or an intended feature.
 102   WNDPROC oldwindow_proc =
 103       reinterpret_cast<WNDPROC>(GetWindowLongPtr(hwnd, GWLP_WNDPROC));
 104   SetWindowLongPtr(hwnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(proc));
 105   return oldwindow_proc;
 106 }
 107
 108 void* SetWindowUserData(HWND hwnd, void* user_data) {
 109   return
 110       reinterpret_cast<void*>(SetWindowLongPtr(hwnd, GWLP_USERDATA,
 111           reinterpret_cast<LONG_PTR>(user_data)));
 112 }
 113
 114 void* GetWindowUserData(HWND hwnd) {
 115   DWORD process_id = 0;
 116   GetWindowThreadProcessId(hwnd, &process_id);
 117   // A window outside the current process needs to be ignored.
 118   if (process_id != ::GetCurrentProcessId())
 119     return NULL;
 120   return reinterpret_cast<void*>(GetWindowLongPtr(hwnd, GWLP_USERDATA));
 121 }
 122
 123 #pragma warning(pop)
 124
 125 bool DoesWindowBelongToActiveWindow(HWND window) {
 126   DCHECK(window);
 127   HWND top_window = ::GetAncestor(window, GA_ROOT);
 128   if (!top_window)
 129     return false;
 130
 131   HWND active_top_window = ::GetAncestor(::GetForegroundWindow(), GA_ROOT);
 132   return (top_window == active_top_window);
 133 }
 134
 135 void CenterAndSizeWindow(HWND parent,
 136                          HWND window,
 137                          const Size& pref) {
 138   DCHECK(window && pref.width() > 0 && pref.height() > 0);
 139
 140   // Calculate the ideal bounds.
 141   RECT window_bounds;
 142   RECT center_bounds = {0};
 143   if (parent) {
 144     // If there is a parent, center over the parents bounds.
 145     ::GetWindowRect(parent, &center_bounds);
 146   }
 147
 148   if (::IsRectEmpty(&center_bounds)) {
 149     // No parent or no parent rect. Center over the monitor the window is on.
 150     HMONITOR monitor = MonitorFromWindow(window, MONITOR_DEFAULTTONEAREST);
 151     if (monitor) {
 152       MONITORINFO mi = {0};
 153       mi.cbSize = sizeof(mi);
 154       GetMonitorInfo(monitor, &mi);
 155       center_bounds = mi.rcWork;
 156     } else {
 157       NOTREACHED() << "Unable to get default monitor";
 158     }
 159   }
 160
 161   window_bounds.left = center_bounds.left;
 162   if (pref.width() < (center_bounds.right - center_bounds.left)) {
 163     window_bounds.left +=
 164         (center_bounds.right - center_bounds.left - pref.width()) / 2;
 165   }
 166   window_bounds.right = window_bounds.left + pref.width();
 167
 168   window_bounds.top = center_bounds.top;
 169   if (pref.height() < (center_bounds.bottom - center_bounds.top)) {
 170     window_bounds.top +=
 171         (center_bounds.bottom - center_bounds.top - pref.height()) / 2;
 172   }
 173   window_bounds.bottom = window_bounds.top + pref.height();
 174
 175   // If we're centering a child window, we are positioning in client
 176   // coordinates, and as such we need to offset the target rectangle by the
 177   // position of the parent window.
 178   if (::GetWindowLong(window, GWL_STYLE) & WS_CHILD) {
 179     DCHECK(parent && ::GetParent(window) == parent);
 180     POINT topleft = { window_bounds.left, window_bounds.top };
 181     ::MapWindowPoints(HWND_DESKTOP, parent, &topleft, 1);
 182     window_bounds.left = topleft.x;
 183     window_bounds.top = topleft.y;
 184     window_bounds.right = window_bounds.left + pref.width();
 185     window_bounds.bottom = window_bounds.top + pref.height();
 186   }
 187
 188   AdjustWindowToFit(window, window_bounds, !parent);
 189 }
 190
 191 void CheckWindowCreated(HWND hwnd) {
 192   if (!hwnd) {
 193     switch (GetLastError()) {
 194       case ERROR_NOT_ENOUGH_MEMORY:
 195         CrashOutOfMemory();
 196         break;
 197       case ERROR_ACCESS_DENIED:
 198         CrashAccessDenied();
 199         break;
 200       default:
 201         CrashOther();
 202         break;
 203     }
 204     PLOG(FATAL);
 205   }
 206 }
 207
 208 void ShowSystemMenu(HWND window) {
 209   RECT rect;
 210   GetWindowRect(window, &rect);
 211   Point point = Point(base::i18n::IsRTL() ? rect.right : rect.left, rect.top);
 212   static const int kSystemMenuOffset = 10;
 213   point.Offset(base::i18n::IsRTL() ? -kSystemMenuOffset : kSystemMenuOffset,
 214                kSystemMenuOffset);
 215   ShowSystemMenuAtPoint(window, point);
 216 }
 217
 218 void ShowSystemMenuAtPoint(HWND window, const Point& point) {
 219   // In the Metro process, we never want to show the system menu.
 220   if (base::win::IsMetroProcess())
 221     return;
 222   UINT flags = TPM_LEFTBUTTON | TPM_RIGHTBUTTON | TPM_RETURNCMD;
 223   if (base::i18n::IsRTL())
 224     flags |= TPM_RIGHTALIGN;
 225   HMENU menu = GetSystemMenu(window, FALSE);
 226
 227   // Use task stopwatch to exclude the time while the context menu is open from
 228   // the current task, if any.
 229   tracked_objects::TaskStopwatch stopwatch;
 230   stopwatch.Start();
 231   const int command =
 232       TrackPopupMenu(menu, flags, point.x(), point.y(), 0, window, NULL);
 233   stopwatch.Stop();
 234
 235   if (command)
 236     SendMessage(window, WM_SYSCOMMAND, command, 0);
 237 }
 238
 239 extern "C" {
 240   typedef HWND (*RootWindow)();
 241 }
 242
 243 HWND GetWindowToParentTo(bool get_real_hwnd) {
 244   HMODULE metro = base::win::GetMetroModule();
 245   if (!metro)
 246     return get_real_hwnd ? ::GetDesktopWindow() : HWND_DESKTOP;
 247   // In windows 8 metro-mode the root window is not the desktop.
 248   RootWindow root_window =
 249       reinterpret_cast<RootWindow>(::GetProcAddress(metro, "GetRootWindow"));
 250   return root_window();
 251 }
 252
 253 }  // namespace gfx