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/*
overlaywidget.cpp
This file is part of GammaRay, the Qt application inspection and manipulation tool.
SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
Author: Tobias Koenig <tobias.koenig@kdab.com>
SPDX-License-Identifier: GPL-2.0-or-later
Contact KDAB at <info@kdab.com> for commercial licensing options.
*/
#include "overlaywidget.h"
#include <QDebug>
#include <QDialog>
#include <QEvent>
#include <QLayout>
#include <QPainter>
#include <QSplitter>
using namespace GammaRay;
static QWidget *toplevelWidget(QWidget *widget)
{
Q_ASSERT(widget);
QWidget *parent = widget;
auto isTopLevel = [](QWidget *widget) {
return widget->isWindow();
};
auto lastSuitableParent = parent;
while (parent->parentWidget() && !isTopLevel(parent->parentWidget()) && !isTopLevel(parent)) {
parent = parent->parentWidget();
// don't pick parents that can't take the overlay as a children
if (!qobject_cast<QSplitter *>(parent)) {
lastSuitableParent = parent;
}
}
return lastSuitableParent;
}
OverlayWidget::OverlayWidget()
: m_currentToplevelWidget(nullptr)
, m_drawLayoutOutlineOnly(true)
{
setAttribute(Qt::WA_TransparentForMouseEvents);
setFocusPolicy(Qt::NoFocus);
}
void OverlayWidget::placeOn(const WidgetOrLayoutFacade &item)
{
if (item.isNull()) {
if (!m_currentItem.isNull())
m_currentItem->removeEventFilter(this);
if (m_currentToplevelWidget)
m_currentToplevelWidget->removeEventFilter(this);
m_currentToplevelWidget = nullptr;
m_currentItem.clear();
m_outerRect = QRect();
m_layoutPath = QPainterPath();
update();
return;
}
if (!m_currentItem.isNull())
m_currentItem->removeEventFilter(this);
m_currentItem = item;
QWidget *toplevel = toplevelWidget(item.widget());
Q_ASSERT(toplevel);
if (toplevel != m_currentToplevelWidget) {
if (m_currentToplevelWidget)
m_currentToplevelWidget->removeEventFilter(this);
m_currentToplevelWidget = toplevel;
setParent(toplevel);
move(0, 0);
resize(toplevel->size());
m_currentToplevelWidget->installEventFilter(this);
show();
}
m_currentItem->installEventFilter(this);
updatePositions();
}
bool OverlayWidget::eventFilter(QObject *receiver, QEvent *event)
{
if (!m_currentItem.isNull() && m_currentToplevelWidget != m_currentItem.widget()->window()) { // detect (un)docking
placeOn(m_currentItem);
return false;
}
if (receiver == m_currentItem.data()) {
if (event->type() == QEvent::Resize || event->type() == QEvent::Move || event->type() == QEvent::Show || event->type() == QEvent::Hide) {
resizeOverlay();
updatePositions();
}
} else if (receiver == m_currentToplevelWidget) {
if (event->type() == QEvent::Resize) {
resizeOverlay();
updatePositions();
}
}
return false;
}
void OverlayWidget::updatePositions()
{
if (m_currentItem.isNull() || !m_currentToplevelWidget)
return;
if (!m_currentItem.isVisible())
m_outerRectColor = Qt::green;
else
m_outerRectColor = Qt::red;
const QPoint parentPos = m_currentItem.widget()->mapTo(m_currentToplevelWidget, m_currentItem.pos());
m_outerRect = QRect(parentPos.x(), parentPos.y(),
m_currentItem.geometry().width(),
m_currentItem.geometry().height())
.adjusted(0, 0, -1, -1);
m_layoutPath = QPainterPath();
if (m_currentItem.layout()
&& qstrcmp(m_currentItem.layout()->metaObject()->className(),
"QMainWindowLayout")
!= 0) {
const QRect layoutGeometry = m_currentItem.layout()->geometry();
const QRect mappedOuterRect = QRect(m_currentItem.widget()->mapTo(m_currentToplevelWidget,
layoutGeometry.topLeft()),
layoutGeometry.size());
QPainterPath outerPath;
outerPath.addRect(mappedOuterRect.adjusted(1, 1, -2, -2));
QPainterPath innerPath;
for (int i = 0; i < m_currentItem.layout()->count(); ++i) {
QLayoutItem *item = m_currentItem.layout()->itemAt(i);
if (item->widget() && !item->widget()->isVisible())
continue;
const QRect mappedInnerRect = QRect(m_currentItem.widget()->mapTo(m_currentToplevelWidget,
item->geometry().topLeft()),
item->geometry().size());
innerPath.addRect(mappedInnerRect);
}
m_layoutPath.setFillRule(Qt::OddEvenFill);
m_layoutPath = outerPath.subtracted(innerPath);
if (m_layoutPath.isEmpty()) {
m_layoutPath = std::move(outerPath);
m_layoutPath.addPath(innerPath);
m_drawLayoutOutlineOnly = true;
} else {
m_drawLayoutOutlineOnly = false;
}
}
update();
}
void OverlayWidget::resizeOverlay()
{
if (m_currentToplevelWidget) {
move(0, 0);
resize(m_currentToplevelWidget->size());
}
}
void OverlayWidget::paintEvent(QPaintEvent *)
{
QPainter p(this);
p.setPen(m_outerRectColor);
p.drawRect(m_outerRect);
QBrush brush(Qt::BDiagPattern);
brush.setColor(Qt::blue);
if (!m_drawLayoutOutlineOnly)
p.fillPath(m_layoutPath, brush);
p.setPen(Qt::blue);
p.drawPath(m_layoutPath);
}
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