src/third_party/libjingle/source/talk/base/win32windowpicker.cc

   1 // Copyright 2010 Google Inc. All Rights Reserved
   2
   3
   4 #include "talk/base/win32windowpicker.h"
   5
   6 #include <string>
   7 #include <vector>
   8
   9 #include "talk/base/common.h"
  10 #include "talk/base/logging.h"
  11
  12 namespace talk_base {
  13
  14 namespace {
  15
  16 // Window class names that we want to filter out.
  17 const char kProgramManagerClass[] = "Progman";
  18 const char kButtonClass[] = "Button";
  19
  20 }  // namespace
  21
  22 BOOL CALLBACK Win32WindowPicker::EnumProc(HWND hwnd, LPARAM l_param) {
  23   WindowDescriptionList* descriptions =
  24       reinterpret_cast<WindowDescriptionList*>(l_param);
  25
  26   // Skip windows that are invisible, minimized, have no title, or are owned,
  27   // unless they have the app window style set. Except for minimized windows,
  28   // this is what Alt-Tab does.
  29   // TODO: Figure out how to grab a thumbnail of a minimized window and
  30   // include them in the list.
  31   int len = GetWindowTextLength(hwnd);
  32   HWND owner = GetWindow(hwnd, GW_OWNER);
  33   LONG exstyle = GetWindowLong(hwnd, GWL_EXSTYLE);
  34   if (len == 0 || IsIconic(hwnd) || !IsWindowVisible(hwnd) ||
  35       (owner && !(exstyle & WS_EX_APPWINDOW))) {
  36     // TODO: Investigate if windows without title still could be
  37     // interesting to share. We could use the name of the process as title:
  38     //
  39     // GetWindowThreadProcessId()
  40     // OpenProcess()
  41     // QueryFullProcessImageName()
  42     return TRUE;
  43   }
  44
  45   // Skip the Program Manager window and the Start button.
  46   TCHAR class_name_w[500];
  47   ::GetClassName(hwnd, class_name_w, 500);
  48   std::string class_name = ToUtf8(class_name_w);
  49   if (class_name == kProgramManagerClass || class_name == kButtonClass) {
  50     // We don't want the Program Manager window nor the Start button.
  51     return TRUE;
  52   }
  53
  54   TCHAR window_title[500];
  55   GetWindowText(hwnd, window_title, ARRAY_SIZE(window_title));
  56   std::string title = ToUtf8(window_title);
  57
  58   WindowId id(hwnd);
  59   WindowDescription desc(id, title);
  60   descriptions->push_back(desc);
  61   return TRUE;
  62 }
  63
  64 BOOL CALLBACK Win32WindowPicker::MonitorEnumProc(HMONITOR h_monitor,
  65                                                  HDC hdc_monitor,
  66                                                  LPRECT lprc_monitor,
  67                                                  LPARAM l_param) {
  68   DesktopDescriptionList* desktop_desc =
  69       reinterpret_cast<DesktopDescriptionList*>(l_param);
  70
  71   DesktopId id(h_monitor, static_cast<int>(desktop_desc->size()));
  72   // TODO: Figure out an appropriate desktop title.
  73   DesktopDescription desc(id, "");
  74
  75   // Determine whether it's the primary monitor.
  76   MONITORINFO monitor_info = {0};
  77   monitor_info.cbSize = sizeof(monitor_info);
  78   bool primary = (GetMonitorInfo(h_monitor, &monitor_info) &&
  79       (monitor_info.dwFlags & MONITORINFOF_PRIMARY) != 0);
  80   desc.set_primary(primary);
  81
  82   desktop_desc->push_back(desc);
  83   return TRUE;
  84 }
  85
  86 Win32WindowPicker::Win32WindowPicker() {
  87 }
  88
  89 bool Win32WindowPicker::Init() {
  90   return true;
  91 }
  92 // TODO: Consider changing enumeration to clear() descriptions
  93 // before append().
  94 bool Win32WindowPicker::GetWindowList(WindowDescriptionList* descriptions) {
  95   LPARAM desc = reinterpret_cast<LPARAM>(descriptions);
  96   return EnumWindows(Win32WindowPicker::EnumProc, desc) != FALSE;
  97 }
  98
  99 bool Win32WindowPicker::GetDesktopList(DesktopDescriptionList* descriptions) {
 100   // Create a fresh WindowDescriptionList so that we can use desktop_desc.size()
 101   // in MonitorEnumProc to compute the desktop index.
 102   DesktopDescriptionList desktop_desc;
 103   HDC hdc = GetDC(NULL);
 104   bool success = false;
 105   if (EnumDisplayMonitors(hdc, NULL, Win32WindowPicker::MonitorEnumProc,
 106       reinterpret_cast<LPARAM>(&desktop_desc)) != FALSE) {
 107     // Append the desktop descriptions to the end of the returned descriptions.
 108     descriptions->insert(descriptions->end(), desktop_desc.begin(),
 109                          desktop_desc.end());
 110     success = true;
 111   }
 112   ReleaseDC(NULL, hdc);
 113   return success;
 114 }
 115
 116 bool Win32WindowPicker::GetDesktopDimensions(const DesktopId& id,
 117                                              int* width,
 118                                              int* height) {
 119   MONITORINFOEX monitor_info;
 120   monitor_info.cbSize = sizeof(MONITORINFOEX);
 121   if (!GetMonitorInfo(id.id(), &monitor_info)) {
 122     return false;
 123   }
 124   *width = monitor_info.rcMonitor.right - monitor_info.rcMonitor.left;
 125   *height = monitor_info.rcMonitor.bottom - monitor_info.rcMonitor.top;
 126   return true;
 127 }
 128
 129 bool Win32WindowPicker::IsVisible(const WindowId& id) {
 130   return (::IsWindow(id.id()) != FALSE && ::IsWindowVisible(id.id()) != FALSE);
 131 }
 132
 133 bool Win32WindowPicker::MoveToFront(const WindowId& id) {
 134   return SetForegroundWindow(id.id()) != FALSE;
 135 }
 136
 137 }  // namespace talk_base