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// Copyright 2010 Google Inc. All Rights Reserved
#include "talk/base/macwindowpicker.h"
#include <ApplicationServices/ApplicationServices.h>
#include <CoreFoundation/CoreFoundation.h>
#include <dlfcn.h>
#include "talk/base/logging.h"
#include "talk/base/macutils.h"
namespace talk_base {
static const char* kCoreGraphicsName =
"/System/Library/Frameworks/ApplicationServices.framework/Frameworks/"
"CoreGraphics.framework/CoreGraphics";
static const char* kWindowListCopyWindowInfo = "CGWindowListCopyWindowInfo";
static const char* kWindowListCreateDescriptionFromArray =
"CGWindowListCreateDescriptionFromArray";
// Function pointer for holding the CGWindowListCopyWindowInfo function.
typedef CFArrayRef(*CGWindowListCopyWindowInfoProc)(CGWindowListOption,
CGWindowID);
// Function pointer for holding the CGWindowListCreateDescriptionFromArray
// function.
typedef CFArrayRef(*CGWindowListCreateDescriptionFromArrayProc)(CFArrayRef);
MacWindowPicker::MacWindowPicker() : lib_handle_(NULL), get_window_list_(NULL),
get_window_list_desc_(NULL) {
}
MacWindowPicker::~MacWindowPicker() {
if (lib_handle_ != NULL) {
dlclose(lib_handle_);
}
}
bool MacWindowPicker::Init() {
// TODO: If this class grows to use more dynamically functions
// from the CoreGraphics framework, consider using
// talk/base/latebindingsymboltable.h.
lib_handle_ = dlopen(kCoreGraphicsName, RTLD_NOW);
if (lib_handle_ == NULL) {
LOG(LS_ERROR) << "Could not load CoreGraphics";
return false;
}
get_window_list_ = dlsym(lib_handle_, kWindowListCopyWindowInfo);
get_window_list_desc_ =
dlsym(lib_handle_, kWindowListCreateDescriptionFromArray);
if (get_window_list_ == NULL || get_window_list_desc_ == NULL) {
// The CGWindowListCopyWindowInfo and the
// CGWindowListCreateDescriptionFromArray functions was introduced
// in Leopard(10.5) so this is a normal failure on Tiger.
LOG(LS_INFO) << "Failed to load Core Graphics symbols";
dlclose(lib_handle_);
lib_handle_ = NULL;
return false;
}
return true;
}
bool MacWindowPicker::IsVisible(const WindowId& id) {
// Init if we're not already inited.
if (get_window_list_desc_ == NULL && !Init()) {
return false;
}
CGWindowID ids[1];
ids[0] = id.id();
CFArrayRef window_id_array =
CFArrayCreate(NULL, reinterpret_cast<const void **>(&ids), 1, NULL);
CFArrayRef window_array =
reinterpret_cast<CGWindowListCreateDescriptionFromArrayProc>(
get_window_list_desc_)(window_id_array);
if (window_array == NULL || 0 == CFArrayGetCount(window_array)) {
// Could not find the window. It might have been closed.
LOG(LS_INFO) << "Window not found";
CFRelease(window_id_array);
return false;
}
CFDictionaryRef window = reinterpret_cast<CFDictionaryRef>(
CFArrayGetValueAtIndex(window_array, 0));
CFBooleanRef is_visible = reinterpret_cast<CFBooleanRef>(
CFDictionaryGetValue(window, kCGWindowIsOnscreen));
// Check that the window is visible. If not we might crash.
bool visible = false;
if (is_visible != NULL) {
visible = CFBooleanGetValue(is_visible);
}
CFRelease(window_id_array);
CFRelease(window_array);
return visible;
}
bool MacWindowPicker::MoveToFront(const WindowId& id) {
// Init if we're not already initialized.
if (get_window_list_desc_ == NULL && !Init()) {
return false;
}
CGWindowID ids[1];
ids[0] = id.id();
CFArrayRef window_id_array =
CFArrayCreate(NULL, reinterpret_cast<const void **>(&ids), 1, NULL);
CFArrayRef window_array =
reinterpret_cast<CGWindowListCreateDescriptionFromArrayProc>(
get_window_list_desc_)(window_id_array);
if (window_array == NULL || 0 == CFArrayGetCount(window_array)) {
// Could not find the window. It might have been closed.
LOG(LS_INFO) << "Window not found";
CFRelease(window_id_array);
return false;
}
CFDictionaryRef window = reinterpret_cast<CFDictionaryRef>(
CFArrayGetValueAtIndex(window_array, 0));
CFStringRef window_name_ref = reinterpret_cast<CFStringRef>(
CFDictionaryGetValue(window, kCGWindowName));
CFNumberRef application_pid = reinterpret_cast<CFNumberRef>(
CFDictionaryGetValue(window, kCGWindowOwnerPID));
int pid_val;
CFNumberGetValue(application_pid, kCFNumberIntType, &pid_val);
std::string window_name;
ToUtf8(window_name_ref, &window_name);
// Build an applescript that sets the selected window to front
// within the application. Then set the application to front.
bool result = true;
std::stringstream ss;
ss << "tell application \"System Events\"\n"
<< "set proc to the first item of (every process whose unix id is "
<< pid_val
<< ")\n"
<< "tell proc to perform action \"AXRaise\" of window \""
<< window_name
<< "\"\n"
<< "set the frontmost of proc to true\n"
<< "end tell";
if (!RunAppleScript(ss.str())) {
// This might happen to for example X applications where the X
// server spawns of processes with their own PID but the X server
// is still registered as owner to the application windows. As a
// workaround, we put the X server process to front, meaning that
// all X applications will show up. The drawback with this
// workaround is that the application that we really wanted to set
// to front might be behind another X application.
ProcessSerialNumber psn;
pid_t pid = pid_val;
int res = GetProcessForPID(pid, &psn);
if (res != 0) {
LOG(LS_ERROR) << "Failed getting process for pid";
result = false;
}
res = SetFrontProcess(&psn);
if (res != 0) {
LOG(LS_ERROR) << "Failed setting process to front";
result = false;
}
}
CFRelease(window_id_array);
CFRelease(window_array);
return result;
}
bool MacWindowPicker::GetDesktopList(DesktopDescriptionList* descriptions) {
const uint32_t kMaxDisplays = 128;
CGDirectDisplayID active_displays[kMaxDisplays];
uint32_t display_count = 0;
CGError err = CGGetActiveDisplayList(kMaxDisplays,
active_displays,
&display_count);
if (err != kCGErrorSuccess) {
LOG_E(LS_ERROR, OS, err) << "Failed to enumerate the active displays.";
return false;
}
for (uint32_t i = 0; i < display_count; ++i) {
DesktopId id(active_displays[i], static_cast<int>(i));
// TODO: Figure out an appropriate desktop title.
DesktopDescription desc(id, "");
desc.set_primary(CGDisplayIsMain(id.id()));
descriptions->push_back(desc);
}
return display_count > 0;
}
bool MacWindowPicker::GetDesktopDimensions(const DesktopId& id,
int* width,
int* height) {
*width = CGDisplayPixelsWide(id.id());
*height = CGDisplayPixelsHigh(id.id());
return true;
}
bool MacWindowPicker::GetWindowList(WindowDescriptionList* descriptions) {
// Init if we're not already inited.
if (get_window_list_ == NULL && !Init()) {
return false;
}
// Only get onscreen, non-desktop windows.
CFArrayRef window_array =
reinterpret_cast<CGWindowListCopyWindowInfoProc>(get_window_list_)(
kCGWindowListOptionOnScreenOnly | kCGWindowListExcludeDesktopElements,
kCGNullWindowID);
if (window_array == NULL) {
return false;
}
// Check windows to make sure they have an id, title, and use window layer 0.
CFIndex i;
CFIndex count = CFArrayGetCount(window_array);
for (i = 0; i < count; ++i) {
CFDictionaryRef window = reinterpret_cast<CFDictionaryRef>(
CFArrayGetValueAtIndex(window_array, i));
CFStringRef window_title = reinterpret_cast<CFStringRef>(
CFDictionaryGetValue(window, kCGWindowName));
CFNumberRef window_id = reinterpret_cast<CFNumberRef>(
CFDictionaryGetValue(window, kCGWindowNumber));
CFNumberRef window_layer = reinterpret_cast<CFNumberRef>(
CFDictionaryGetValue(window, kCGWindowLayer));
if (window_title != NULL && window_id != NULL && window_layer != NULL) {
std::string title_str;
int id_val, layer_val;
ToUtf8(window_title, &title_str);
CFNumberGetValue(window_id, kCFNumberIntType, &id_val);
CFNumberGetValue(window_layer, kCFNumberIntType, &layer_val);
// Discard windows without a title.
if (layer_val == 0 && title_str.length() > 0) {
WindowId id(static_cast<CGWindowID>(id_val));
WindowDescription desc(id, title_str);
descriptions->push_back(desc);
}
}
}
CFRelease(window_array);
return true;
}
} // namespace talk_base
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