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
12namespace talk_base {
13
14namespace {
15
16// Window class names that we want to filter out.
17const char kProgramManagerClass[] = "Progman";
18const char kButtonClass[] = "Button";
19
20}  // namespace
21
22BOOL 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
64BOOL 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
86Win32WindowPicker::Win32WindowPicker() {
87}
88
89bool Win32WindowPicker::Init() {
90  return true;
91}
92// TODO: Consider changing enumeration to clear() descriptions
93// before append().
94bool Win32WindowPicker::GetWindowList(WindowDescriptionList* descriptions) {
95  LPARAM desc = reinterpret_cast<LPARAM>(descriptions);
96  return EnumWindows(Win32WindowPicker::EnumProc, desc) != FALSE;
97}
98
99bool 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
116bool 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
129bool Win32WindowPicker::IsVisible(const WindowId& id) {
130  return (::IsWindow(id.id()) != FALSE && ::IsWindowVisible(id.id()) != FALSE);
131}
132
133bool Win32WindowPicker::MoveToFront(const WindowId& id) {
134  return SetForegroundWindow(id.id()) != FALSE;
135}
136
137}  // namespace talk_base
138