Implement Screen::GetAllDisplays for windows.

ui/gfx/screen_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/screen_win.h"
 
 #include <windows.h>
 
 #include "base/logging.h"
 #include "base/win/win_util.h"
 #include "ui/base/win/dpi.h"
 #include "ui/gfx/display.h"
 
 namespace {
 
 MONITORINFO GetMonitorInfoForMonitor(HMONITOR monitor) {
   MONITORINFO monitor_info = { 0 };
   monitor_info.cbSize = sizeof(monitor_info);
   base::win::GetMonitorInfoWrapper(monitor, &monitor_info);
   return monitor_info;
 }
 
 gfx::Display GetDisplay(MONITORINFO& monitor_info) {
   // TODO(oshima): Implement ID and Observer.

[Haojian Wu, 2013/08/25 07:49:58]

oshima@, Do you have any idea about the display |id| implementation?
I think we will need for DisplayInfoProvider.

[oshima, 2013/08/26 18:33:12]

Can you take deviceID and generate hash using base::Hash function into
int64? If the data isn't available, then just use index (which is consistent
with chromeos)

[Haojian Wu, 2013/08/30 13:52:16]

I have separated a new CL to finish this. see
https://codereview.chromium.org/23707010/

   gfx::Rect bounds = gfx::Rect(monitor_info.rcMonitor);
   gfx::Display display(0, bounds);
   display.set_work_area(gfx::Rect(monitor_info.rcWork));
   display.SetScaleAndBounds(ui::win::GetDeviceScaleFactor(), bounds);
   return display;
 }
 
+BOOL CALLBACK EnumMonitorCallback(HMONITOR monitor,
+                                  HDC hdc,
+                                  LPRECT rect,
+                                  LPARAM data) {
+  std::vector<gfx::Display>* all_displays =
+      reinterpret_cast<std::vector<gfx::Display>*>(data);
+  DCHECK(all_displays);
+
+  MONITORINFO monitor_info = GetMonitorInfoForMonitor(monitor);
+  gfx::Display display = GetDisplay(monitor_info);
+  all_displays->push_back(display);
+  return TRUE;
+}
+
 }  // namespace
 
 namespace gfx {
 
 ScreenWin::ScreenWin() {
 }
 
 ScreenWin::~ScreenWin() {
 }
 
@@ skipping 11 matching lines @@
   POINT location;
   HWND window_hwnd = GetCursorPos(&location) ? WindowFromPoint(location) : NULL;
   return GetNativeWindowFromHWND(window_hwnd);
 }
 
 int ScreenWin::GetNumDisplays() const {
   return GetSystemMetrics(SM_CMONITORS);
 }
 
 std::vector<gfx::Display> ScreenWin::GetAllDisplays() const {
-  NOTIMPLEMENTED();
-  return std::vector<gfx::Display>(1, GetPrimaryDisplay());
+  std::vector<gfx::Display> all_displays;
+  EnumDisplayMonitors(NULL, NULL, EnumMonitorCallback,
+                      reinterpret_cast<LPARAM>(&all_displays));
+  return all_displays;
 }
 
 gfx::Display ScreenWin::GetDisplayNearestWindow(gfx::NativeView window) const {
   HWND window_hwnd = GetHWNDFromNativeView(window);
   if (!window_hwnd) {
     // When |window| isn't rooted to a display, we should just return the
     // default display so we get some correct display information like the
     // scaling factor.
     return GetPrimaryDisplay();
   }
@@ skipping 62 matching lines @@
 #endif  // USE_AURA
 }
 
 #if !defined(USE_AURA)
 Screen* CreateNativeScreen() {
   return new ScreenWin;
 }
 #endif  // !USE_AURA
 
 }  // namespace gfx