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manager.cpp
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// Aseprite UI Library
// Copyright (C) 2018-2024 Igara Studio S.A.
// Copyright (C) 2001-2018 David Capello
//
// This file is released under the terms of the MIT license.
// Read LICENSE.txt for more information.
// #define REPORT_MESSAGES 1
// #define REPORT_MOUSE_MESSAGES 1
// #define REPORT_PAINT_MESSAGES 1
// #define REPORT_TIMER_MESSAGES 1
// #define REPORT_FOCUS_MOVEMENT 1
// #define DEBUG_PAINT_MESSAGES 1
// #define LIMIT_DISPATCH_TIME 1
#define GARBAGE_TRACE(...) // TRACE(__VA_ARGS__)
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ui/manager.h"
#include "base/concurrent_queue.h"
#include "base/scoped_value.h"
#include "base/thread.h"
#include "base/time.h"
#include "fmt/format.h"
#include "os/event.h"
#include "os/event_queue.h"
#include "os/surface.h"
#include "os/system.h"
#include "os/window.h"
#include "os/window_spec.h"
#include "ui/intern.h"
#include "ui/ui.h"
#include <algorithm>
#include <limits>
#include <list>
#include <memory>
#include <thread>
#include <utility>
#include <vector>
#if defined(_WIN32) && defined(DEBUG_PAINT_MESSAGES)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#undef min
#undef max
#endif
namespace ui {
namespace {
// The redraw state is used to avoid drawing the manager when a window
// has been just closed by the user, so we delay the redrawing (the
// kPaintMessages generation) for the next generateMessages() round.
enum class RedrawState {
Normal,
AWindowHasJustBeenClosed,
RedrawDelayed,
ClosingApp,
};
RedrawState redrawState = RedrawState::Normal;
} // anonymous namespace
static const int NFILTERS = (int)(kFirstRegisteredMessage+1);
struct Filter {
int message;
Widget* widget;
Filter(int message, Widget* widget)
: message(message)
, widget(widget) { }
};
typedef std::list<Message*> Messages;
typedef std::list<Filter*> Filters;
Manager* Manager::m_defaultManager = nullptr;
static std::thread::id manager_thread;
static WidgetsList mouse_widgets_list; // List of widgets to send mouse events
static Messages msg_queue; // Messages queue
static Messages used_msg_queue; // Messages queue
static base::concurrent_queue<Message*> concurrent_msg_queue;
static Filters msg_filters[NFILTERS]; // Filters for every enqueued message
static int filter_locks = 0;
// Current display with the mouse, used to avoid processing a
// os::Event::MouseLeave of the non-current display/window as when we
// move the mouse between two windows we can receive:
//
// 1. A os::Event::MouseEnter of the new window
// 2. A os::Event::MouseLeave of the old window
//
// Instead of the MouseLeave event of the old window first.
static Display* mouse_display = nullptr;
static Widget* focus_widget; // The widget with the focus
static Widget* mouse_widget; // The widget with the mouse
static Widget* capture_widget; // The widget that captures the mouse
static bool first_time = true; // true when we don't enter in poll yet
// Don't adjust window positions automatically when it's false. Used
// when Screen/UI scaling is changed to avoid adjusting windows as
// when the os::Display is resized by the user.
static bool auto_window_adjustment = true;
// Keyboard focus movement stuff
inline bool does_accept_focus(Widget* widget)
{
return ((((widget)->flags() & (FOCUS_STOP |
DISABLED |
HIDDEN |
DECORATIVE)) == FOCUS_STOP) &&
((widget)->isVisible()));
}
static int count_widgets_accept_focus(Widget* widget);
static bool child_accept_focus(Widget* widget, bool first);
static Widget* next_widget(Widget* widget);
static int cmp_left(Widget* widget, int x, int y);
static int cmp_right(Widget* widget, int x, int y);
static int cmp_up(Widget* widget, int x, int y);
static int cmp_down(Widget* widget, int x, int y);
namespace {
class LockFilters {
public:
LockFilters() {
++filter_locks;
}
~LockFilters() {
ASSERT(filter_locks > 0);
--filter_locks;
if (filter_locks == 0) {
// Clear empty filters
for (Filters& msg_filter : msg_filters) {
for (auto it = msg_filter.begin(); it != msg_filter.end(); ) {
Filter* filter = *it;
if (filter->widget == nullptr) {
delete filter;
it = msg_filter.erase(it);
}
else {
++it;
}
}
}
}
}
};
os::Hit handle_native_hittest(os::Window* osWindow,
const gfx::Point& pos)
{
Display* display = Manager::getDisplayFromNativeWindow(osWindow);
if (display) {
auto window = static_cast<Window*>(display->containedWidget());
switch (window->hitTest(pos)) {
case HitTestNowhere: return os::Hit::Content;
case HitTestCaption: return os::Hit::TitleBar;
case HitTestClient: return os::Hit::Content;
case HitTestBorderNW: return os::Hit::TopLeft;
case HitTestBorderN: return os::Hit::Top;
case HitTestBorderNE: return os::Hit::TopRight;
case HitTestBorderE: return os::Hit::Right;
case HitTestBorderSE: return os::Hit::BottomRight;
case HitTestBorderS: return os::Hit::Bottom;
case HitTestBorderSW: return os::Hit::BottomLeft;
case HitTestBorderW: return os::Hit::Left;
}
}
return os::Hit::None;
}
} // anonymous namespace
// static
bool Manager::widgetAssociatedToManager(Widget* widget)
{
return (focus_widget == widget ||
mouse_widget == widget ||
capture_widget == widget ||
std::find(mouse_widgets_list.begin(),
mouse_widgets_list.end(),
widget) != mouse_widgets_list.end());
}
Manager::Manager(const os::WindowRef& nativeWindow)
: Widget(kManagerWidget)
, m_display(nullptr, nativeWindow, this)
, m_eventQueue(os::instance()->eventQueue())
, m_lockedWindow(nullptr)
, m_mouseButton(kButtonNone)
{
// The native window can be nullptr when running tests
if (nativeWindow)
nativeWindow->setUserData(&m_display);
ASSERT(manager_thread == std::thread::id());
manager_thread = std::this_thread::get_id();
if (!m_defaultManager) {
// Empty lists
ASSERT(msg_queue.empty());
mouse_widgets_list.clear();
// Reset variables
focus_widget = nullptr;
mouse_widget = nullptr;
capture_widget = nullptr;
}
setBounds(m_display.bounds());
setVisible(true);
// Default manager is the first one (and is always visible).
if (!m_defaultManager)
m_defaultManager = this;
// TODO check if this is needed
onNewDisplayConfiguration(&m_display);
}
Manager::~Manager()
{
ASSERT(manager_thread == std::this_thread::get_id());
// There are some messages in queue? Dispatch everything.
dispatchMessages();
collectGarbage();
// Finish the main manager.
if (m_defaultManager == this) {
// No more cursor
set_mouse_cursor(kNoCursor);
// Check timers & filters
#ifdef _DEBUG
if (get_app_state() != AppState::kClosingWithException) {
ASSERT(!Timer::haveTimers());
for (Filters& msg_filter : msg_filters)
ASSERT(msg_filter.empty());
}
ASSERT(msg_queue.empty());
#endif
// No more default manager
m_defaultManager = nullptr;
// Shutdown system
mouse_widgets_list.clear();
}
}
// static
Display* Manager::getDisplayFromNativeWindow(os::Window* window)
{
if (window)
return window->userData<Display>();
else
return nullptr;
}
void Manager::run()
{
MessageLoop loop(this);
if (first_time) {
first_time = false;
invalidate();
set_mouse_cursor(kArrowCursor);
}
while (!children().empty())
loop.pumpMessages();
}
void Manager::flipAllDisplays()
{
OverlayManager* overlays = OverlayManager::instance();
update_cursor_overlay();
// Draw overlays.
overlays->drawOverlays();
m_display.flipDisplay();
if (get_multiple_displays()) {
for (auto child : children()) {
auto window = static_cast<Window*>(child);
if (window->ownDisplay())
window->display()->flipDisplay();
}
}
}
void Manager::updateAllDisplays(int scale, bool gpu)
{
os::Window* nativeWindow = m_display.nativeWindow();
nativeWindow->setScale(scale);
nativeWindow->setGpuAcceleration(gpu);
if (get_multiple_displays()) {
for (auto child : children()) {
auto window = static_cast<Window*>(child);
if (window->ownDisplay()) {
Display* display = static_cast<Window*>(child)->display();
display->nativeWindow()->setScale(scale);
display->nativeWindow()->setGpuAcceleration(gpu);
onNewDisplayConfiguration(display);
}
}
}
onNewDisplayConfiguration(&m_display);
}
bool Manager::generateMessages()
{
ASSERT(manager_thread == std::this_thread::get_id());
// First check: there are windows to manage?
if (children().empty())
return false;
// Generate messages from other threads
if (!concurrent_msg_queue.empty()) {
Message* msg = nullptr;
while (concurrent_msg_queue.try_pop(msg))
msg_queue.push_back(msg);
}
// Generate messages from OS input
generateMessagesFromOSEvents();
// Generate messages for timers
Timer::pollTimers();
// Returns true if we have to dispatch messages (if the redraw was
// delayed, we have to pump messages because there is where paint
// messages are flushed)
if (!msg_queue.empty() || redrawState != RedrawState::Normal)
return true;
else
return false;
}
void Manager::generateSetCursorMessage(Display* display,
const gfx::Point& mousePos,
KeyModifiers modifiers,
PointerType pointerType)
{
if (get_mouse_cursor() == kOutsideDisplay)
return;
Widget* dst = (capture_widget ? capture_widget: mouse_widget);
if (dst)
enqueueMessage(
newMouseMessage(
kSetCursorMessage,
display, dst,
mousePos,
pointerType,
m_mouseButton,
modifiers));
else
set_mouse_cursor(kArrowCursor);
}
static MouseButton mouse_button_from_os_to_ui(const os::Event& osEvent)
{
static_assert((int)os::Event::NoneButton == (int)ui::kButtonNone &&
(int)os::Event::LeftButton == (int)ui::kButtonLeft &&
(int)os::Event::RightButton == (int)ui::kButtonRight &&
(int)os::Event::MiddleButton == (int)ui::kButtonMiddle &&
(int)os::Event::X1Button == (int)ui::kButtonX1 &&
(int)os::Event::X2Button == (int)ui::kButtonX2,
"Mouse button constants do not match");
return (MouseButton)osEvent.button();
}
void Manager::generateMessagesFromOSEvents()
{
ASSERT(manager_thread == std::this_thread::get_id());
os::Event lastMouseMoveEvent;
// Events from laf-os
os::Event osEvent;
for (;;) {
// Calculate how much time we can wait for the next message in the
// event queue.
double timeout = 0.0;
if (msg_queue.empty() && redrawState == RedrawState::Normal) {
if (!Timer::getNextTimeout(timeout))
timeout = os::EventQueue::kWithoutTimeout;
}
if (timeout == os::EventQueue::kWithoutTimeout && used_msg_queue.empty())
collectGarbage();
#if _DEBUG
else if (!m_garbage.empty()) {
GARBAGE_TRACE("collectGarbage() wasn't called #objects=%d"
" (msg_queue=%d used_msg_queue=%d redrawState=%d timeout=%.16g)\n",
int(m_garbage.size()),
msg_queue.size(),
used_msg_queue.size(),
int(redrawState),
timeout);
}
#endif
m_eventQueue->getEvent(osEvent, timeout);
if (osEvent.type() == os::Event::None)
break;
Display* display = getDisplayFromNativeWindow(osEvent.window().get());
if (!display)
display = this->display();
switch (osEvent.type()) {
case os::Event::CloseApp: {
Message* msg = new Message(kCloseDisplayMessage);
msg->setDisplay(display);
msg->setRecipient(this);
msg->setPropagateToChildren(true);
enqueueMessage(msg);
break;
}
case os::Event::CloseWindow: {
Message* msg = new Message(kCloseDisplayMessage);
msg->setDisplay(display);
msg->setRecipient(this);
msg->setPropagateToChildren(true);
enqueueMessage(msg);
break;
}
case os::Event::ResizeWindow: {
Message* msg = new Message(kResizeDisplayMessage);
msg->setDisplay(display);
msg->setRecipient(this);
msg->setPropagateToChildren(false);
enqueueMessage(msg);
break;
}
case os::Event::DropFiles: {
Message* msg = new DropFilesMessage(osEvent.files());
msg->setDisplay(display);
msg->setRecipient(this);
enqueueMessage(msg);
break;
}
case os::Event::KeyDown:
case os::Event::KeyUp: {
Message* msg = new KeyMessage(
(osEvent.type() == os::Event::KeyDown ?
kKeyDownMessage:
kKeyUpMessage),
osEvent.scancode(),
osEvent.modifiers(),
osEvent.unicodeChar(),
osEvent.repeat());
msg->setDisplay(display);
if (osEvent.isDeadKey())
static_cast<KeyMessage*>(msg)->setDeadKey(true);
broadcastKeyMsg(msg);
enqueueMessage(msg);
break;
}
case os::Event::MouseEnter: {
if (get_multiple_displays()) {
if (osEvent.window()) {
ASSERT(display != nullptr);
_internal_set_mouse_display(display);
}
}
set_mouse_cursor(kArrowCursor);
mouse_display = display;
lastMouseMoveEvent = osEvent;
break;
}
case os::Event::MouseLeave: {
if (mouse_display == display) {
set_mouse_cursor(kOutsideDisplay);
setMouse(nullptr);
_internal_no_mouse_position();
mouse_display = nullptr;
}
// To avoid calling kSetCursorMessage when the mouse leaves
// the window.
lastMouseMoveEvent = os::Event();
break;
}
case os::Event::MouseMove: {
handleMouseMove(
display,
osEvent.position(),
osEvent.modifiers(),
osEvent.pointerType(),
osEvent.pressure());
lastMouseMoveEvent = osEvent;
break;
}
case os::Event::MouseDown: {
handleMouseDown(
display,
osEvent.position(),
m_mouseButton = mouse_button_from_os_to_ui(osEvent),
osEvent.modifiers(),
osEvent.pointerType(),
osEvent.pressure());
break;
}
case os::Event::MouseUp: {
handleMouseUp(
display,
osEvent.position(),
mouse_button_from_os_to_ui(osEvent),
osEvent.modifiers(),
osEvent.pointerType());
m_mouseButton = kButtonNone;
break;
}
case os::Event::MouseDoubleClick: {
handleMouseDoubleClick(
display,
osEvent.position(),
m_mouseButton = mouse_button_from_os_to_ui(osEvent),
osEvent.modifiers(),
osEvent.pointerType(),
osEvent.pressure());
break;
}
case os::Event::MouseWheel: {
handleMouseWheel(display,
osEvent.position(),
osEvent.modifiers(),
osEvent.pointerType(),
osEvent.wheelDelta(),
osEvent.preciseWheel());
break;
}
case os::Event::TouchMagnify: {
handleTouchMagnify(display,
osEvent.position(),
osEvent.modifiers(),
osEvent.magnification());
break;
}
case os::Event::Callback: {
// Call from the UI thread
osEvent.execCallback();
break;
}
}
}
// Generate just one kSetCursorMessage for the last mouse position
if (lastMouseMoveEvent.type() != os::Event::None) {
osEvent = lastMouseMoveEvent;
Display* display = getDisplayFromNativeWindow(osEvent.window().get());
if (!display)
display = this->display();
generateSetCursorMessage(display,
osEvent.position(),
osEvent.modifiers(),
osEvent.pointerType());
}
}
void Manager::handleMouseMove(Display* display,
const gfx::Point& mousePos,
const KeyModifiers modifiers,
const PointerType pointerType,
const float pressure)
{
updateMouseWidgets(mousePos, display);
// Send the mouse movement message
Widget* dst = (capture_widget ? capture_widget: mouse_widget);
enqueueMessage(
newMouseMessage(
kMouseMoveMessage,
display, dst,
mousePos,
pointerType,
m_mouseButton,
modifiers,
gfx::Point(0, 0),
false,
pressure));
}
void Manager::handleMouseDown(Display* display,
const gfx::Point& mousePos,
MouseButton mouseButton,
KeyModifiers modifiers,
PointerType pointerType,
const float pressure)
{
// Returns false in case that we click another Display (os::Window)
// that is not the current running top-most foreground window.
if (!handleWindowZOrder())
return;
enqueueMessage(
newMouseMessage(
kMouseDownMessage,
display,
(capture_widget ? capture_widget: mouse_widget),
mousePos,
pointerType,
mouseButton,
modifiers,
gfx::Point(0, 0),
false,
pressure));
}
void Manager::handleMouseUp(Display* display,
const gfx::Point& mousePos,
MouseButton mouseButton,
KeyModifiers modifiers,
PointerType pointerType)
{
enqueueMessage(
newMouseMessage(
kMouseUpMessage,
display,
(capture_widget ? capture_widget: mouse_widget),
mousePos,
pointerType,
mouseButton,
modifiers));
}
void Manager::handleMouseDoubleClick(Display* display,
const gfx::Point& mousePos,
MouseButton mouseButton,
KeyModifiers modifiers,
PointerType pointerType,
const float pressure)
{
Widget* dst = (capture_widget ? capture_widget: mouse_widget);
if (dst) {
enqueueMessage(
newMouseMessage(
kDoubleClickMessage,
display, dst, mousePos, pointerType,
mouseButton, modifiers,
gfx::Point(0, 0), false,
pressure));
}
}
void Manager::handleMouseWheel(Display* display,
const gfx::Point& mousePos,
KeyModifiers modifiers,
PointerType pointerType,
const gfx::Point& wheelDelta,
bool preciseWheel)
{
enqueueMessage(newMouseMessage(
kMouseWheelMessage,
display,
(capture_widget ? capture_widget: mouse_widget),
mousePos, pointerType, m_mouseButton, modifiers,
wheelDelta, preciseWheel));
}
void Manager::handleTouchMagnify(Display* display,
const gfx::Point& mousePos,
const KeyModifiers modifiers,
const double magnification)
{
Widget* widget = (capture_widget ? capture_widget: mouse_widget);
if (widget) {
Message* msg = new TouchMessage(
kTouchMagnifyMessage,
modifiers,
mousePos,
magnification);
msg->setDisplay(display);
msg->setRecipient(widget);
enqueueMessage(msg);
}
}
// Handles Z order: Send the window to top (only when you click in a
// window that aren't the desktop).
//
// TODO code similar to Display::handleWindowZOrder()
bool Manager::handleWindowZOrder()
{
if (capture_widget || !mouse_widget)
return true;
// The clicked window
Window* window = mouse_widget->window();
Window* topWindow = getTopWindow();
if ((window) &&
// We cannot change Z-order of desktop windows
(!window->isDesktop()) &&
// We cannot change Z order of foreground windows because a
// foreground window can launch other background windows
// which should be kept on top of the foreground one.
(!window->isForeground()) &&
// If the window is not already the top window of the manager.
(window != topWindow)) {
// If there is already a top foreground window, cancel the z-order change
if (topWindow && topWindow->isForeground())
return false;
base::ScopedValue<Widget*> scoped(m_lockedWindow, window);
window->display()->handleWindowZOrder(window);
// Put it in the top of the list
removeChild(window);
if (window->isOnTop())
insertChild(0, window);
else {
int pos = (int)children().size();
for (auto it=children().rbegin(),
end=children().rend();
it != end; ++it) {
if (static_cast<Window*>(*it)->isOnTop())
break;
--pos;
}
insertChild(pos, window);
}
if (!window->ownDisplay())
window->invalidate();
}
// Put the focus
setFocus(mouse_widget);
return true;
}
// If display is nullptr, mousePos is in screen coordinates, if not,
// it's relative to the display content rect.
void Manager::updateMouseWidgets(const gfx::Point& mousePos,
Display* display)
{
gfx::Point screenPos;
if (display) {
screenPos = display->nativeWindow()->pointToScreen(mousePos);
display->updateLastMousePos(mousePos);
}
else {
screenPos = mousePos;
}
// Get the list of widgets to send mouse messages.
mouse_widgets_list.clear();
broadcastMouseMessage(screenPos,
mouse_widgets_list);
// Get the widget under the mouse
Widget* widget = nullptr;
for (auto mouseWidget : mouse_widgets_list) {
if (get_multiple_displays()) {
if (display) {
if (display != mouseWidget->display()) {
widget = mouseWidget->display()->containedWidget()->pickFromScreenPos(screenPos);
}
else {
widget = mouseWidget->pick(mousePos);
}
}
else {
widget = mouseWidget->display()->containedWidget()->pickFromScreenPos(screenPos);
}
}
else {
if (display)
widget = mouseWidget->pick(mousePos);
else
widget = mouseWidget->pickFromScreenPos(screenPos);
}
if (widget) {
// Get the first ancestor of the picked widget that doesn't
// ignore mouse events.
while (widget && widget->hasFlags(IGNORE_MOUSE))
widget = widget->parent();
break;
}
}
// Fixup "mouse" flag
if (widget != mouse_widget) {
if (!widget) {
freeMouse();
}
else {
setMouse(widget);
}
}
}
void Manager::dispatchMessages()
{
// Send messages in the queue (mouse/key/timer/etc. events) This
// might change the state of widgets, etc. In case pumpQueue()
// returns a number greater than 0, it means that we've processed
// some messages, so we've to redraw the screen.
if (pumpQueue() > 0 || redrawState == RedrawState::RedrawDelayed) {
if (redrawState == RedrawState::ClosingApp) {
// Do nothing, we don't flush nor process paint messages
}
// If a window has just been closed with Manager::_closeWindow()
// after processing messages, we'll wait the next event generation
// to process painting events (so the manager doesn't lost the
// DIRTY flag right now).
else if (redrawState == RedrawState::AWindowHasJustBeenClosed) {
redrawState = RedrawState::RedrawDelayed;
}
else {
if (redrawState == RedrawState::RedrawDelayed)
redrawState = RedrawState::Normal;
// Generate and send just kPaintMessages with the latest UI state.
flushRedraw();
pumpQueue();
// Flip back-buffers to real displays.
flipAllDisplays();
}
}
}
void Manager::addToGarbage(Widget* widget)
{
ASSERT(widget);
m_garbage.push_back(widget);
}
void Manager::enqueueMessage(Message* msg)
{
ASSERT(msg);
if (is_ui_thread())
msg_queue.push_back(msg);
else
concurrent_msg_queue.push(msg);
}
Window* Manager::getTopWindow()
{
return static_cast<Window*>(UI_FIRST_WIDGET(children()));
}
Window* Manager::getDesktopWindow()
{
for (auto child : children()) {
Window* window = static_cast<Window*>(child);
if (window->isDesktop())
return window;
}
return nullptr;
}
Window* Manager::getForegroundWindow()
{
for (auto child : children()) {
Window* window = static_cast<Window*>(child);
if (window->isForeground() ||
window->isDesktop())
return window;
}
return nullptr;
}
Display* Manager::getForegroundDisplay()
{
if (get_multiple_displays()) {
Window* window = getForegroundWindow();
if (window)
return window->display();
}
return &m_display;
}
Widget* Manager::getFocus()
{
return focus_widget;
}
Widget* Manager::getMouse()
{
return mouse_widget;
}
Widget* Manager::getCapture()
{
return capture_widget;
}
void Manager::setFocus(Widget* widget)
{
if ((focus_widget != widget)
&& (!(widget)
|| (!(widget->hasFlags(DISABLED))
&& !(widget->hasFlags(HIDDEN))
&& !(widget->hasFlags(DECORATIVE))
&& someParentIsFocusStop(widget)))) {
Widget* commonAncestor = findLowestCommonAncestor(focus_widget, widget);
// Fetch the focus
if (focus_widget && focus_widget != commonAncestor) {
auto msg = new Message(kFocusLeaveMessage);
msg->setRecipient(focus_widget);
msg->setPropagateToParent(true);
msg->setCommonAncestor(commonAncestor);
enqueueMessage(msg);
// Remove HAS_FOCUS from all hierarchy
auto a = focus_widget;
while (a && a != commonAncestor) {
a->disableFlags(HAS_FOCUS);
a = a->parent();
}
}
// Put the focus
focus_widget = widget;
if (widget) {
auto msg = new Message(kFocusEnterMessage);
msg->setRecipient(widget);
msg->setPropagateToParent(true);
msg->setCommonAncestor(commonAncestor);
enqueueMessage(msg);
// Add HAS_FOCUS to all hierarchy
auto a = focus_widget;
while (a && a != commonAncestor) {
if (a->hasFlags(FOCUS_STOP))
a->enableFlags(HAS_FOCUS);
a = a->parent();
}
}
}
}
void Manager::setMouse(Widget* widget)
{
#if REPORT_MOUSE_MESSAGES
TRACEARGS("Manager::setMouse ",
(widget ? typeid(*widget).name(): "null"),
(widget ? widget->id(): ""));
#endif
if (mouse_widget == widget)
return;
Widget* commonAncestor = findLowestCommonAncestor(mouse_widget, widget);