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      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/screen_win.h"
      6 
      7 #include <windows.h>
      8 
      9 #include "base/hash.h"
     10 #include "base/logging.h"
     11 #include "base/strings/utf_string_conversions.h"
     12 #include "base/win/win_util.h"
     13 #include "ui/gfx/display.h"
     14 #include "ui/gfx/win/dpi.h"
     15 
     16 namespace {
     17 
     18 MONITORINFOEX GetMonitorInfoForMonitor(HMONITOR monitor) {
     19   MONITORINFOEX monitor_info;
     20   ZeroMemory(&monitor_info, sizeof(MONITORINFOEX));
     21   monitor_info.cbSize = sizeof(monitor_info);
     22   GetMonitorInfo(monitor, &monitor_info);
     23   return monitor_info;
     24 }
     25 
     26 gfx::Display GetDisplay(MONITORINFOEX& monitor_info) {
     27   int64 id = static_cast<int64>(
     28       base::Hash(base::WideToUTF8(monitor_info.szDevice)));
     29   gfx::Rect bounds = gfx::Rect(monitor_info.rcMonitor);
     30   gfx::Display display(id, bounds);
     31   display.set_work_area(gfx::Rect(monitor_info.rcWork));
     32   display.SetScaleAndBounds(gfx::win::GetDeviceScaleFactor(), bounds);
     33 
     34   DEVMODE mode;
     35   memset(&mode, 0, sizeof(DEVMODE));
     36   mode.dmSize = sizeof(DEVMODE);
     37   mode.dmDriverExtra = 0;
     38   if (EnumDisplaySettings(monitor_info.szDevice,
     39                           ENUM_CURRENT_SETTINGS,
     40                           &mode)) {
     41     switch (mode.dmDisplayOrientation) {
     42     case DMDO_DEFAULT:
     43       display.set_rotation(gfx::Display::ROTATE_0);
     44       break;
     45     case DMDO_90:
     46       display.set_rotation(gfx::Display::ROTATE_90);
     47       break;
     48     case DMDO_180:
     49       display.set_rotation(gfx::Display::ROTATE_180);
     50       break;
     51     case DMDO_270:
     52       display.set_rotation(gfx::Display::ROTATE_270);
     53       break;
     54     default:
     55       NOTREACHED();
     56     }
     57   }
     58 
     59   return display;
     60 }
     61 
     62 BOOL CALLBACK EnumMonitorCallback(HMONITOR monitor,
     63                                   HDC hdc,
     64                                   LPRECT rect,
     65                                   LPARAM data) {
     66   std::vector<gfx::Display>* all_displays =
     67       reinterpret_cast<std::vector<gfx::Display>*>(data);
     68   DCHECK(all_displays);
     69 
     70   MONITORINFOEX monitor_info = GetMonitorInfoForMonitor(monitor);
     71   gfx::Display display = GetDisplay(monitor_info);
     72   all_displays->push_back(display);
     73   return TRUE;
     74 }
     75 
     76 std::vector<gfx::Display> GetDisplays() {
     77   std::vector<gfx::Display> displays;
     78   EnumDisplayMonitors(NULL, NULL, EnumMonitorCallback,
     79                       reinterpret_cast<LPARAM>(&displays));
     80   return displays;
     81 }
     82 
     83 }  // namespace
     84 
     85 namespace gfx {
     86 
     87 ScreenWin::ScreenWin()
     88     : displays_(GetDisplays()) {
     89   SingletonHwnd::GetInstance()->AddObserver(this);
     90 }
     91 
     92 ScreenWin::~ScreenWin() {
     93   SingletonHwnd::GetInstance()->RemoveObserver(this);
     94 }
     95 
     96 bool ScreenWin::IsDIPEnabled() {
     97   return IsInHighDPIMode();
     98 }
     99 
    100 gfx::Point ScreenWin::GetCursorScreenPoint() {
    101   POINT pt;
    102   GetCursorPos(&pt);
    103   gfx::Point cursor_pos_pixels(pt);
    104   return gfx::win::ScreenToDIPPoint(cursor_pos_pixels);
    105 }
    106 
    107 gfx::NativeWindow ScreenWin::GetWindowUnderCursor() {
    108   POINT cursor_loc;
    109   HWND hwnd = GetCursorPos(&cursor_loc) ? WindowFromPoint(cursor_loc) : NULL;
    110   return GetNativeWindowFromHWND(hwnd);
    111 }
    112 
    113 gfx::NativeWindow ScreenWin::GetWindowAtScreenPoint(const gfx::Point& point) {
    114   gfx::Point point_in_pixels = gfx::win::DIPToScreenPoint(point);
    115   return GetNativeWindowFromHWND(WindowFromPoint(point_in_pixels.ToPOINT()));
    116 }
    117 
    118 int ScreenWin::GetNumDisplays() const {
    119   return GetSystemMetrics(SM_CMONITORS);
    120 }
    121 
    122 std::vector<gfx::Display> ScreenWin::GetAllDisplays() const {
    123   return displays_;
    124 }
    125 
    126 gfx::Display ScreenWin::GetDisplayNearestWindow(gfx::NativeView window) const {
    127   HWND window_hwnd = GetHWNDFromNativeView(window);
    128   if (!window_hwnd) {
    129     // When |window| isn't rooted to a display, we should just return the
    130     // default display so we get some correct display information like the
    131     // scaling factor.
    132     return GetPrimaryDisplay();
    133   }
    134 
    135   MONITORINFOEX monitor_info;
    136   monitor_info.cbSize = sizeof(monitor_info);
    137   GetMonitorInfo(MonitorFromWindow(window_hwnd, MONITOR_DEFAULTTONEAREST),
    138                  &monitor_info);
    139   return GetDisplay(monitor_info);
    140 }
    141 
    142 gfx::Display ScreenWin::GetDisplayNearestPoint(const gfx::Point& point) const {
    143   POINT initial_loc = { point.x(), point.y() };
    144   HMONITOR monitor = MonitorFromPoint(initial_loc, MONITOR_DEFAULTTONEAREST);
    145   MONITORINFOEX mi;
    146   ZeroMemory(&mi, sizeof(MONITORINFOEX));
    147   mi.cbSize = sizeof(mi);
    148   if (monitor && GetMonitorInfo(monitor, &mi)) {
    149     return GetDisplay(mi);
    150   }
    151   return gfx::Display();
    152 }
    153 
    154 gfx::Display ScreenWin::GetDisplayMatching(const gfx::Rect& match_rect) const {
    155   RECT other_bounds_rect = match_rect.ToRECT();
    156   MONITORINFOEX monitor_info = GetMonitorInfoForMonitor(MonitorFromRect(
    157       &other_bounds_rect, MONITOR_DEFAULTTONEAREST));
    158   return GetDisplay(monitor_info);
    159 }
    160 
    161 gfx::Display ScreenWin::GetPrimaryDisplay() const {
    162   MONITORINFOEX mi = GetMonitorInfoForMonitor(
    163       MonitorFromWindow(NULL, MONITOR_DEFAULTTOPRIMARY));
    164   gfx::Display display = GetDisplay(mi);
    165   // TODO(kevers|girard): Test if these checks can be reintroduced for high-DIP
    166   // once more of the app is DIP-aware.
    167   if (!(IsInHighDPIMode() || IsHighDPIEnabled())) {
    168     DCHECK_EQ(GetSystemMetrics(SM_CXSCREEN), display.size().width());
    169     DCHECK_EQ(GetSystemMetrics(SM_CYSCREEN), display.size().height());
    170   }
    171   return display;
    172 }
    173 
    174 void ScreenWin::AddObserver(DisplayObserver* observer) {
    175   change_notifier_.AddObserver(observer);
    176 }
    177 
    178 void ScreenWin::RemoveObserver(DisplayObserver* observer) {
    179   change_notifier_.RemoveObserver(observer);
    180 }
    181 
    182 void ScreenWin::OnWndProc(HWND hwnd,
    183                           UINT message,
    184                           WPARAM wparam,
    185                           LPARAM lparam) {
    186   if (message != WM_DISPLAYCHANGE)
    187     return;
    188 
    189   std::vector<gfx::Display> old_displays = displays_;
    190   displays_ = GetDisplays();
    191 
    192   change_notifier_.NotifyDisplaysChanged(old_displays, displays_);
    193 }
    194 
    195 HWND ScreenWin::GetHWNDFromNativeView(NativeView window) const {
    196   NOTREACHED();
    197   return NULL;
    198 }
    199 
    200 NativeWindow ScreenWin::GetNativeWindowFromHWND(HWND hwnd) const {
    201   NOTREACHED();
    202   return NULL;
    203 }
    204 
    205 }  // namespace gfx
    206