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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome_frame/test/window_watchdog.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "chrome_frame/function_stub.h"
WindowWatchdog::WindowWatchdog() : hook_(NULL), hook_stub_(NULL) {
}
WindowWatchdog::~WindowWatchdog() {
UninitializeHook();
}
void WindowWatchdog::AddObserver(WindowObserver* observer,
const std::string& window_class) {
WindowObserverEntry new_entry = { observer, window_class };
observers_.push_back(new_entry);
if (!hook_)
InitializeHook();
}
void WindowWatchdog::RemoveObserver(WindowObserver* observer) {
for (ObserverMap::iterator i = observers_.begin(); i != observers_.end();) {
i = (observer = i->observer) ? observers_.erase(i) : ++i;
}
if (observers_.empty())
UninitializeHook();
}
bool WindowWatchdog::InitializeHook() {
DCHECK(hook_ == NULL);
DCHECK(hook_stub_ == NULL);
hook_stub_ = FunctionStub::Create(reinterpret_cast<uintptr_t>(this),
WinEventHook);
hook_ = SetWinEventHook(EVENT_OBJECT_SHOW, EVENT_OBJECT_SHOW, NULL,
reinterpret_cast<WINEVENTPROC>(hook_stub_->code()), 0,
0, WINEVENT_OUTOFCONTEXT | WINEVENT_SKIPOWNPROCESS);
return hook_ != NULL;
}
void WindowWatchdog::UninitializeHook() {
if (hook_) {
::UnhookWinEvent(hook_);
hook_ = NULL;
FunctionStub::Destroy(hook_stub_);
hook_stub_ = NULL;
}
}
// static
void WindowWatchdog::WinEventHook(WindowWatchdog* me, HWINEVENTHOOK hook,
DWORD event, HWND hwnd, LONG object_id,
LONG child_id, DWORD event_thread_id,
DWORD event_time) {
// We need to look for top level windows and a natural check is for
// WS_CHILD. Instead, checking for WS_CAPTION allows us to filter
// out other stray popups
if (!(WS_CAPTION & GetWindowLong(hwnd, GWL_STYLE)))
return;
char class_name[MAX_PATH] = {0};
::GetClassNameA(hwnd, class_name, arraysize(class_name));
ObserverMap interested_observers;
for (ObserverMap::iterator i = me->observers_.begin();
i != me->observers_.end(); i++) {
if (0 == lstrcmpA(i->window_class.c_str(), class_name)) {
interested_observers.push_back(*i);
}
}
std::string caption;
int len = ::GetWindowTextLength(hwnd) + 1;
::GetWindowTextA(hwnd, WriteInto(&caption, len), len);
for (ObserverMap::iterator i = interested_observers.begin();
i != interested_observers.end(); i++) {
i->observer->OnWindowDetected(hwnd, caption);
}
}
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