root/ui/gfx/screen_win.cc

DEFINITIONS

1. GetMonitorInfoForMonitor
2. GetDisplay
3. EnumMonitorCallback
4. IsDIPEnabled
5. GetCursorScreenPoint
6. GetWindowUnderCursor
7. GetWindowAtScreenPoint
8. GetNumDisplays
9. GetAllDisplays
10. GetDisplayNearestWindow
11. GetDisplayNearestPoint
12. GetDisplayMatching
13. GetPrimaryDisplay
14. AddObserver
15. RemoveObserver
16. GetHWNDFromNativeView
17. GetNativeWindowFromHWND
18. CreateNativeScreen

// 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/hash.h"
#include "base/logging.h"
#include "base/strings/utf_string_conversions.h"
#include "base/win/win_util.h"
#include "ui/gfx/display.h"
#include "ui/gfx/win/dpi.h"

namespace {

MONITORINFOEX GetMonitorInfoForMonitor(HMONITOR monitor) {
  MONITORINFOEX monitor_info;
  ZeroMemory(&monitor_info, sizeof(MONITORINFOEX));
  monitor_info.cbSize = sizeof(monitor_info);
  GetMonitorInfo(monitor, &monitor_info);
  return monitor_info;
}

gfx::Display GetDisplay(MONITORINFOEX& monitor_info) {
  // TODO(oshima): Implement Observer.
  int64 id = static_cast<int64>(
      base::Hash(base::WideToUTF8(monitor_info.szDevice)));
  gfx::Rect bounds = gfx::Rect(monitor_info.rcMonitor);
  gfx::Display display(id, bounds);
  display.set_work_area(gfx::Rect(monitor_info.rcWork));
  display.SetScaleAndBounds(gfx::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);

  MONITORINFOEX monitor_info = GetMonitorInfoForMonitor(monitor);
  gfx::Display display = GetDisplay(monitor_info);
  all_displays->push_back(display);
  return TRUE;
}

}  // namespace

namespace gfx {

ScreenWin::ScreenWin() {
}

ScreenWin::~ScreenWin() {
}

bool ScreenWin::IsDIPEnabled() {
  return IsInHighDPIMode();
}

gfx::Point ScreenWin::GetCursorScreenPoint() {
  POINT pt;
  GetCursorPos(&pt);
  return gfx::Point(pt);
}

gfx::NativeWindow ScreenWin::GetWindowUnderCursor() {
  POINT cursor_loc;
  HWND hwnd = GetCursorPos(&cursor_loc) ? WindowFromPoint(cursor_loc) : NULL;
  return GetNativeWindowFromHWND(hwnd);
}

gfx::NativeWindow ScreenWin::GetWindowAtScreenPoint(const gfx::Point& point) {
  return GetNativeWindowFromHWND(WindowFromPoint(point.ToPOINT()));
}

int ScreenWin::GetNumDisplays() const {
  return GetSystemMetrics(SM_CMONITORS);
}

std::vector<gfx::Display> ScreenWin::GetAllDisplays() const {
  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();
  }

  MONITORINFOEX monitor_info;
  monitor_info.cbSize = sizeof(monitor_info);
  GetMonitorInfo(MonitorFromWindow(window_hwnd, MONITOR_DEFAULTTONEAREST),
                 &monitor_info);
  return GetDisplay(monitor_info);
}

gfx::Display ScreenWin::GetDisplayNearestPoint(const gfx::Point& point) const {
  POINT initial_loc = { point.x(), point.y() };
  HMONITOR monitor = MonitorFromPoint(initial_loc, MONITOR_DEFAULTTONEAREST);
  MONITORINFOEX mi;
  ZeroMemory(&mi, sizeof(MONITORINFOEX));
  mi.cbSize = sizeof(mi);
  if (monitor && GetMonitorInfo(monitor, &mi)) {
    return GetDisplay(mi);
  }
  return gfx::Display();
}

gfx::Display ScreenWin::GetDisplayMatching(const gfx::Rect& match_rect) const {
  RECT other_bounds_rect = match_rect.ToRECT();
  MONITORINFOEX monitor_info = GetMonitorInfoForMonitor(MonitorFromRect(
      &other_bounds_rect, MONITOR_DEFAULTTONEAREST));
  return GetDisplay(monitor_info);
}

gfx::Display ScreenWin::GetPrimaryDisplay() const {
  MONITORINFOEX mi = GetMonitorInfoForMonitor(
      MonitorFromWindow(NULL, MONITOR_DEFAULTTOPRIMARY));
  gfx::Display display = GetDisplay(mi);
  // TODO(kevers|girard): Test if these checks can be reintroduced for high-DIP
  // once more of the app is DIP-aware.
  if (!(IsInHighDPIMode() || IsHighDPIEnabled())) {
    DCHECK_EQ(GetSystemMetrics(SM_CXSCREEN), display.size().width());
    DCHECK_EQ(GetSystemMetrics(SM_CYSCREEN), display.size().height());
  }
  return display;
}

void ScreenWin::AddObserver(DisplayObserver* observer) {
  // TODO(oshima): crbug.com/122863.
}

void ScreenWin::RemoveObserver(DisplayObserver* observer) {
  // TODO(oshima): crbug.com/122863.
}

HWND ScreenWin::GetHWNDFromNativeView(NativeView window) const {
#if defined(USE_AURA)
  NOTREACHED();
  return NULL;
#else
  return window;
#endif  // USE_AURA
}

NativeWindow ScreenWin::GetNativeWindowFromHWND(HWND hwnd) const {
#if defined(USE_AURA)
  NOTREACHED();
  return NULL;
#else
  return hwnd;
#endif  // USE_AURA
}

#if !defined(USE_AURA)
Screen* CreateNativeScreen() {
  return new ScreenWin;
}
#endif  // !USE_AURA

}  // namespace gfx