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