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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.
//
// Utilities for windows (as in HWND).
#include "ceee/common/window_utils.h"
#include "base/logging.h"
#include "ceee/common/com_utils.h"
#include "ceee/common/process_utils_win.h"
namespace {
static bool CanAccessWindowProcess(HWND window) {
bool can_access = false;
return SUCCEEDED(process_utils_win::ProcessCompatibilityCheck::IsCompatible(
window, &can_access)) && can_access;
}
} // namespace
namespace window_utils {
bool IsWindowClass(HWND window, const std::wstring& window_class) {
if (!::IsWindow(window)) {
// No DCHECK, we may get her while a window is being destroyed.
return false;
}
wchar_t class_name[MAX_PATH] = { 0 };
int chars_copied = ::GetClassName(window, class_name, arraysize(class_name));
LOG_IF(ERROR, chars_copied == 0) << "GetClassName, err=" << ::GetLastError();
return (window_class == class_name);
}
HWND GetTopLevelParent(HWND window) {
HWND top_level = window;
while (HWND parent = ::GetParent(top_level)) {
top_level = parent;
}
return top_level;
}
bool IsWindowThread(HWND window) {
DWORD process_id = 0;
return ::GetCurrentThreadId() == ::GetWindowThreadProcessId(window,
&process_id) && ::GetCurrentProcessId() == process_id;
}
bool WindowHasNoThread(HWND window) {
return ::GetWindowThreadProcessId(window, NULL) == 0;
}
// Changes made to this struct must also be made to the unittest code.
struct FindDescendentData {
FindDescendentData(const std::wstring& window_class, bool only_visible,
bool check_compatibility)
: window_class(window_class), only_visible(only_visible),
check_process_access(check_compatibility), descendent(NULL) {
}
const std::wstring& window_class;
bool only_visible;
HWND descendent;
bool check_process_access;
};
BOOL CALLBACK HandleDescendentWindowProc(HWND window, LPARAM param) {
DCHECK(window && param);
FindDescendentData* data = reinterpret_cast<FindDescendentData*>(param);
if (data && IsWindowClass(window, data->window_class) &&
(!data->only_visible || IsWindowVisible(window)) &&
(!data->check_process_access || CanAccessWindowProcess(window))) {
data->descendent = window;
return FALSE;
}
return TRUE;
}
bool FindDescendentWindowEx(
HWND ancestor, const std::wstring& window_class,
bool only_visible, bool only_accessible, HWND* descendent) {
FindDescendentData data(window_class, only_visible, only_accessible);
::EnumChildWindows(ancestor, HandleDescendentWindowProc,
reinterpret_cast<LPARAM>(&data));
if (data.descendent != NULL) {
if (descendent != NULL)
*descendent = data.descendent;
return true;
} else {
return false;
}
}
bool FindDescendentWindow(
HWND ancestor, const std::wstring& window_class, bool only_visible,
HWND* descendent) {
return FindDescendentWindowEx(ancestor, window_class,
only_visible, true, descendent);
}
struct FindTopLevelWindowsData {
FindTopLevelWindowsData(const std::wstring& window_class,
bool check_compatibility,
std::set<HWND>* windows)
: window_class(window_class),
windows(windows),
check_process_access(check_compatibility) {
}
const std::wstring& window_class;
std::set<HWND>* windows;
bool check_process_access;
};
BOOL CALLBACK HandleChildWindowProc(HWND window, LPARAM param) {
DCHECK(window && param);
FindTopLevelWindowsData* data =
reinterpret_cast<FindTopLevelWindowsData*>(param);
if (data != NULL && (data->window_class.empty() ||
IsWindowClass(window, data->window_class)) &&
(!data->check_process_access || CanAccessWindowProcess(window))) {
DCHECK(data->windows != NULL);
data->windows->insert(window);
}
return TRUE;
}
void FindTopLevelWindowsEx(const std::wstring& window_class, bool only_visible,
std::set<HWND>* top_level_windows) {
FindTopLevelWindowsData find_data(window_class, only_visible,
top_level_windows);
::EnumWindows(HandleChildWindowProc, reinterpret_cast<LPARAM>(&find_data));
}
void FindTopLevelWindows(const std::wstring& window_class,
std::set<HWND>* top_level_windows) {
FindTopLevelWindowsEx(window_class, true, top_level_windows);
}
} // namespace window_utils
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