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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.
//
// Window message source implementation.
#include "ceee/ie/plugin/bho/window_message_source.h"
#include <algorithm>
#include "base/logging.h"
#include "ceee/common/window_utils.h"
#include "ceee/common/windows_constants.h"
#include "ceee/ie/common/ceee_module_util.h"
WindowMessageSource::MessageSourceMap WindowMessageSource::message_source_map_;
Lock WindowMessageSource::lock_;
WindowMessageSource::WindowMessageSource()
: create_thread_id_(::GetCurrentThreadId()),
get_message_hook_(NULL),
call_wnd_proc_ret_hook_(NULL) {
}
WindowMessageSource::~WindowMessageSource() {
DCHECK(get_message_hook_ == NULL);
DCHECK(call_wnd_proc_ret_hook_ == NULL);
DCHECK(GetEntryFromMap(create_thread_id_) == NULL);
}
bool WindowMessageSource::Initialize() {
if (!AddEntryToMap(create_thread_id_, this))
return false;
get_message_hook_ = ::SetWindowsHookEx(WH_GETMESSAGE, GetMessageHookProc,
NULL, create_thread_id_);
if (get_message_hook_ == NULL) {
TearDown();
return false;
}
ceee_module_util::RegisterHookForSafetyNet(get_message_hook_);
call_wnd_proc_ret_hook_ = ::SetWindowsHookEx(WH_CALLWNDPROCRET,
CallWndProcRetHookProc, NULL,
create_thread_id_);
if (call_wnd_proc_ret_hook_ == NULL) {
TearDown();
return false;
}
ceee_module_util::RegisterHookForSafetyNet(call_wnd_proc_ret_hook_);
return true;
}
void WindowMessageSource::TearDown() {
if (get_message_hook_ != NULL) {
ceee_module_util::UnregisterHookForSafetyNet(get_message_hook_);
::UnhookWindowsHookEx(get_message_hook_);
get_message_hook_ = NULL;
}
if (call_wnd_proc_ret_hook_ != NULL) {
ceee_module_util::UnregisterHookForSafetyNet(call_wnd_proc_ret_hook_);
::UnhookWindowsHookEx(call_wnd_proc_ret_hook_);
call_wnd_proc_ret_hook_ = NULL;
}
RemoveEntryFromMap(create_thread_id_);
}
void WindowMessageSource::RegisterSink(Sink* sink) {
DCHECK(create_thread_id_ == ::GetCurrentThreadId());
if (sink == NULL)
return;
std::vector<Sink*>::iterator iter = std::find(sinks_.begin(), sinks_.end(),
sink);
if (iter == sinks_.end())
sinks_.push_back(sink);
}
void WindowMessageSource::UnregisterSink(Sink* sink) {
DCHECK(create_thread_id_ == ::GetCurrentThreadId());
if (sink == NULL)
return;
std::vector<Sink*>::iterator iter = std::find(sinks_.begin(), sinks_.end(),
sink);
if (iter != sinks_.end())
sinks_.erase(iter);
}
// static
LRESULT CALLBACK WindowMessageSource::GetMessageHookProc(int code,
WPARAM wparam,
LPARAM lparam) {
if (code == HC_ACTION && wparam == PM_REMOVE) {
MSG* message_info = reinterpret_cast<MSG*>(lparam);
if (message_info != NULL) {
if ((message_info->message >= WM_MOUSEFIRST &&
message_info->message <= WM_MOUSELAST) ||
(message_info->message >= WM_KEYFIRST &&
message_info->message <= WM_KEYLAST)) {
WindowMessageSource* source = GetEntryFromMap(::GetCurrentThreadId());
if (source != NULL)
source->OnHandleMessage(message_info);
}
}
}
return ::CallNextHookEx(NULL, code, wparam, lparam);
}
void WindowMessageSource::OnHandleMessage(const MSG* message_info) {
DCHECK(create_thread_id_ == ::GetCurrentThreadId());
DCHECK(message_info != NULL);
MessageType type = IsWithinTabContentWindow(message_info->hwnd) ?
TAB_CONTENT_WINDOW : BROWSER_UI_SAME_THREAD;
for (std::vector<Sink*>::iterator iter = sinks_.begin(); iter != sinks_.end();
++iter) {
(*iter)->OnHandleMessage(type, message_info);
}
}
// static
LRESULT CALLBACK WindowMessageSource::CallWndProcRetHookProc(int code,
WPARAM wparam,
LPARAM lparam) {
if (code == HC_ACTION) {
CWPRETSTRUCT* message_info = reinterpret_cast<CWPRETSTRUCT*>(lparam);
if (message_info != NULL && message_info->message == WM_NCDESTROY) {
WindowMessageSource* source = GetEntryFromMap(::GetCurrentThreadId());
if (source != NULL)
source->OnWindowNcDestroy(message_info->hwnd);
}
}
return ::CallNextHookEx(NULL, code, wparam, lparam);
}
void WindowMessageSource::OnWindowNcDestroy(HWND window) {
DCHECK(create_thread_id_ == ::GetCurrentThreadId());
tab_content_window_map_.erase(window);
}
bool WindowMessageSource::IsWithinTabContentWindow(HWND window) {
DCHECK(create_thread_id_ == ::GetCurrentThreadId());
if (window == NULL)
return false;
// Look up the cache to see whether we have already examined this window
// handle and got the answer.
TabContentWindowMap::const_iterator iter =
tab_content_window_map_.find(window);
if (iter != tab_content_window_map_.end())
return iter->second;
// Examine whether the window or one of its ancestors is the tab content
// window.
std::vector<HWND> self_and_ancestors;
bool is_within_tab_content_window = false;
do {
self_and_ancestors.push_back(window);
if (window_utils::IsWindowClass(window,
windows::kIeTabContentWindowClass)) {
is_within_tab_content_window = true;
break;
}
window = ::GetAncestor(window, GA_PARENT);
if (window == NULL || !window_utils::IsWindowThread(window))
break;
TabContentWindowMap::const_iterator iter =
tab_content_window_map_.find(window);
if (iter != tab_content_window_map_.end()) {
is_within_tab_content_window = iter->second;
break;
}
} while (true);
// Add the windows that we have examined into the cache.
for (std::vector<HWND>::const_iterator iter = self_and_ancestors.begin();
iter != self_and_ancestors.end(); ++iter) {
tab_content_window_map_.insert(
std::make_pair<HWND, bool>(*iter, is_within_tab_content_window));
}
return is_within_tab_content_window;
}
// static
bool WindowMessageSource::AddEntryToMap(DWORD thread_id,
WindowMessageSource* source) {
DCHECK(source != NULL);
AutoLock auto_lock(lock_);
MessageSourceMap::const_iterator iter = message_source_map_.find(thread_id);
if (iter != message_source_map_.end())
return false;
message_source_map_.insert(
std::make_pair<DWORD, WindowMessageSource*>(thread_id, source));
return true;
}
// static
WindowMessageSource* WindowMessageSource::GetEntryFromMap(DWORD thread_id) {
AutoLock auto_lock(lock_);
MessageSourceMap::const_iterator iter = message_source_map_.find(thread_id);
return iter == message_source_map_.end() ? NULL : iter->second;
}
// static
void WindowMessageSource::RemoveEntryFromMap(DWORD thread_id) {
AutoLock auto_lock(lock_);
message_source_map_.erase(thread_id);
}
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