1 // Copyright 2010 Google Inc. All Rights Reserved
4 #include "talk/base/macwindowpicker.h"
6 #include <ApplicationServices/ApplicationServices.h>
7 #include <CoreFoundation/CoreFoundation.h>
10 #include "talk/base/logging.h"
11 #include "talk/base/macutils.h"
15 static const char* kCoreGraphicsName =
16 "/System/Library/Frameworks/ApplicationServices.framework/Frameworks/"
17 "CoreGraphics.framework/CoreGraphics";
19 static const char* kWindowListCopyWindowInfo = "CGWindowListCopyWindowInfo";
20 static const char* kWindowListCreateDescriptionFromArray =
21 "CGWindowListCreateDescriptionFromArray";
23 // Function pointer for holding the CGWindowListCopyWindowInfo function.
24 typedef CFArrayRef(*CGWindowListCopyWindowInfoProc)(CGWindowListOption,
27 // Function pointer for holding the CGWindowListCreateDescriptionFromArray
29 typedef CFArrayRef(*CGWindowListCreateDescriptionFromArrayProc)(CFArrayRef);
31 MacWindowPicker::MacWindowPicker() : lib_handle_(NULL), get_window_list_(NULL),
32 get_window_list_desc_(NULL) {
35 MacWindowPicker::~MacWindowPicker() {
36 if (lib_handle_ != NULL) {
41 bool MacWindowPicker::Init() {
42 // TODO: If this class grows to use more dynamically functions
43 // from the CoreGraphics framework, consider using
44 // talk/base/latebindingsymboltable.h.
45 lib_handle_ = dlopen(kCoreGraphicsName, RTLD_NOW);
46 if (lib_handle_ == NULL) {
47 LOG(LS_ERROR) << "Could not load CoreGraphics";
51 get_window_list_ = dlsym(lib_handle_, kWindowListCopyWindowInfo);
52 get_window_list_desc_ =
53 dlsym(lib_handle_, kWindowListCreateDescriptionFromArray);
54 if (get_window_list_ == NULL || get_window_list_desc_ == NULL) {
55 // The CGWindowListCopyWindowInfo and the
56 // CGWindowListCreateDescriptionFromArray functions was introduced
57 // in Leopard(10.5) so this is a normal failure on Tiger.
58 LOG(LS_INFO) << "Failed to load Core Graphics symbols";
67 bool MacWindowPicker::IsVisible(const WindowId& id) {
68 // Init if we're not already inited.
69 if (get_window_list_desc_ == NULL && !Init()) {
74 CFArrayRef window_id_array =
75 CFArrayCreate(NULL, reinterpret_cast<const void **>(&ids), 1, NULL);
77 CFArrayRef window_array =
78 reinterpret_cast<CGWindowListCreateDescriptionFromArrayProc>(
79 get_window_list_desc_)(window_id_array);
80 if (window_array == NULL || 0 == CFArrayGetCount(window_array)) {
81 // Could not find the window. It might have been closed.
82 LOG(LS_INFO) << "Window not found";
83 CFRelease(window_id_array);
87 CFDictionaryRef window = reinterpret_cast<CFDictionaryRef>(
88 CFArrayGetValueAtIndex(window_array, 0));
89 CFBooleanRef is_visible = reinterpret_cast<CFBooleanRef>(
90 CFDictionaryGetValue(window, kCGWindowIsOnscreen));
92 // Check that the window is visible. If not we might crash.
94 if (is_visible != NULL) {
95 visible = CFBooleanGetValue(is_visible);
97 CFRelease(window_id_array);
98 CFRelease(window_array);
102 bool MacWindowPicker::MoveToFront(const WindowId& id) {
103 // Init if we're not already initialized.
104 if (get_window_list_desc_ == NULL && !Init()) {
109 CFArrayRef window_id_array =
110 CFArrayCreate(NULL, reinterpret_cast<const void **>(&ids), 1, NULL);
112 CFArrayRef window_array =
113 reinterpret_cast<CGWindowListCreateDescriptionFromArrayProc>(
114 get_window_list_desc_)(window_id_array);
115 if (window_array == NULL || 0 == CFArrayGetCount(window_array)) {
116 // Could not find the window. It might have been closed.
117 LOG(LS_INFO) << "Window not found";
118 CFRelease(window_id_array);
122 CFDictionaryRef window = reinterpret_cast<CFDictionaryRef>(
123 CFArrayGetValueAtIndex(window_array, 0));
124 CFStringRef window_name_ref = reinterpret_cast<CFStringRef>(
125 CFDictionaryGetValue(window, kCGWindowName));
126 CFNumberRef application_pid = reinterpret_cast<CFNumberRef>(
127 CFDictionaryGetValue(window, kCGWindowOwnerPID));
130 CFNumberGetValue(application_pid, kCFNumberIntType, &pid_val);
131 std::string window_name;
132 ToUtf8(window_name_ref, &window_name);
134 // Build an applescript that sets the selected window to front
135 // within the application. Then set the application to front.
137 std::stringstream ss;
138 ss << "tell application \"System Events\"\n"
139 << "set proc to the first item of (every process whose unix id is "
142 << "tell proc to perform action \"AXRaise\" of window \""
145 << "set the frontmost of proc to true\n"
147 if (!RunAppleScript(ss.str())) {
148 // This might happen to for example X applications where the X
149 // server spawns of processes with their own PID but the X server
150 // is still registered as owner to the application windows. As a
151 // workaround, we put the X server process to front, meaning that
152 // all X applications will show up. The drawback with this
153 // workaround is that the application that we really wanted to set
154 // to front might be behind another X application.
155 ProcessSerialNumber psn;
157 int res = GetProcessForPID(pid, &psn);
159 LOG(LS_ERROR) << "Failed getting process for pid";
162 res = SetFrontProcess(&psn);
164 LOG(LS_ERROR) << "Failed setting process to front";
168 CFRelease(window_id_array);
169 CFRelease(window_array);
173 bool MacWindowPicker::GetDesktopList(DesktopDescriptionList* descriptions) {
174 const uint32_t kMaxDisplays = 128;
175 CGDirectDisplayID active_displays[kMaxDisplays];
176 uint32_t display_count = 0;
178 CGError err = CGGetActiveDisplayList(kMaxDisplays,
181 if (err != kCGErrorSuccess) {
182 LOG_E(LS_ERROR, OS, err) << "Failed to enumerate the active displays.";
185 for (uint32_t i = 0; i < display_count; ++i) {
186 DesktopId id(active_displays[i], static_cast<int>(i));
187 // TODO: Figure out an appropriate desktop title.
188 DesktopDescription desc(id, "");
189 desc.set_primary(CGDisplayIsMain(id.id()));
190 descriptions->push_back(desc);
192 return display_count > 0;
195 bool MacWindowPicker::GetDesktopDimensions(const DesktopId& id,
198 *width = CGDisplayPixelsWide(id.id());
199 *height = CGDisplayPixelsHigh(id.id());
203 bool MacWindowPicker::GetWindowList(WindowDescriptionList* descriptions) {
204 // Init if we're not already inited.
205 if (get_window_list_ == NULL && !Init()) {
209 // Only get onscreen, non-desktop windows.
210 CFArrayRef window_array =
211 reinterpret_cast<CGWindowListCopyWindowInfoProc>(get_window_list_)(
212 kCGWindowListOptionOnScreenOnly | kCGWindowListExcludeDesktopElements,
214 if (window_array == NULL) {
218 // Check windows to make sure they have an id, title, and use window layer 0.
220 CFIndex count = CFArrayGetCount(window_array);
221 for (i = 0; i < count; ++i) {
222 CFDictionaryRef window = reinterpret_cast<CFDictionaryRef>(
223 CFArrayGetValueAtIndex(window_array, i));
224 CFStringRef window_title = reinterpret_cast<CFStringRef>(
225 CFDictionaryGetValue(window, kCGWindowName));
226 CFNumberRef window_id = reinterpret_cast<CFNumberRef>(
227 CFDictionaryGetValue(window, kCGWindowNumber));
228 CFNumberRef window_layer = reinterpret_cast<CFNumberRef>(
229 CFDictionaryGetValue(window, kCGWindowLayer));
230 if (window_title != NULL && window_id != NULL && window_layer != NULL) {
231 std::string title_str;
232 int id_val, layer_val;
233 ToUtf8(window_title, &title_str);
234 CFNumberGetValue(window_id, kCFNumberIntType, &id_val);
235 CFNumberGetValue(window_layer, kCFNumberIntType, &layer_val);
237 // Discard windows without a title.
238 if (layer_val == 0 && title_str.length() > 0) {
239 WindowId id(static_cast<CGWindowID>(id_val));
240 WindowDescription desc(id, title_str);
241 descriptions->push_back(desc);
246 CFRelease(window_array);
250 } // namespace talk_base