File indexing completed on 2024-04-28 15:32:16

 /*
     This file is part of the KDE project
     SPDX-FileCopyrightText: 2008 Fredrik Höglund <fredrik@kde.org>
     SPDX-FileCopyrightText: 2008 Konstantin Heil <konst.heil@stud.uni-heidelberg.de>
     SPDX-FileCopyrightText: 2009 Peter Penz <peter.penz@gmx.at>
     SPDX-FileCopyrightText: 2017 Elvis Angelaccio <elvis.angelaccio@kde.org>
 
     SPDX-License-Identifier: LGPL-2.1-or-later
 */
 
 #include "ktooltipwidget.h"
 
 #include <QPaintEvent>
 #include <QScreen>
 #include <QStyleOptionFrame>
 #include <QStylePainter>
 #include <QTimer>
 #include <QVBoxLayout>
 #include <QWindow>
 
 class KToolTipWidgetPrivate
 {
 public:
     KToolTipWidgetPrivate(KToolTipWidget *parent)
         : q(parent)
     {
     }
 
     void init();
     void addWidget(QWidget *widget);
     void removeWidget();
     void show(const QPoint &pos, QWindow *transientParent);
     void storeParent();
     void restoreParent();
     QPoint centerBelow(const QRect &rect, QScreen *screen) const;
 
     KToolTipWidget *const q;
     QTimer hideTimer;
     QVBoxLayout *layout = nullptr;
     QWidget *content = nullptr;
     QWidget *contentParent = nullptr;
 };
 
 void KToolTipWidgetPrivate::init()
 {
     layout = new QVBoxLayout(q);
 
     hideTimer.setSingleShot(true);
     hideTimer.setInterval(500);
 
     QObject::connect(&hideTimer, &QTimer::timeout, q, &QWidget::hide);
 
     q->setAttribute(Qt::WA_TranslucentBackground);
     q->setWindowFlags(Qt::ToolTip | Qt::FramelessWindowHint | Qt::NoDropShadowWindowHint);
 }
 
 void KToolTipWidgetPrivate::addWidget(QWidget *widget)
 {
     removeWidget();
     content = widget;
     storeParent();
     layout->addWidget(content);
     QObject::connect(content, &QWidget::destroyed, q, &QWidget::hide);
 }
 
 void KToolTipWidgetPrivate::removeWidget()
 {
     layout->removeWidget(content);
     restoreParent();
 }
 
 void KToolTipWidgetPrivate::show(const QPoint &pos, QWindow *transientParent)
 {
     if (pos.isNull()) {
         return;
     }
 
     q->move(pos);
     q->createWinId();
     q->windowHandle()->setProperty("ENABLE_BLUR_BEHIND_HINT", true);
     q->windowHandle()->setTransientParent(transientParent);
     q->show();
 }
 
 void KToolTipWidgetPrivate::storeParent()
 {
     if (!content) {
         return;
     }
 
     contentParent = qobject_cast<QWidget *>(content->parent());
 }
 
 void KToolTipWidgetPrivate::restoreParent()
 {
     if (!content || !contentParent) {
         return;
     }
 
     content->setParent(contentParent);
 }
 
 QPoint KToolTipWidgetPrivate::centerBelow(const QRect &rect, QScreen *screen) const
 {
     // It must be assured that:
     // - the content is fully visible
     // - the content is not drawn inside rect
 
     const QSize size = q->sizeHint();
     const int margin = q->style()->pixelMetric(QStyle::PM_ToolTipLabelFrameWidth);
     const QRect screenGeometry = screen->geometry();
 
     const bool hasRoomToLeft = (rect.left() - size.width() - margin >= screenGeometry.left());
     const bool hasRoomToRight = (rect.right() + size.width() + margin <= screenGeometry.right());
     const bool hasRoomAbove = (rect.top() - size.height() - margin >= screenGeometry.top());
     const bool hasRoomBelow = (rect.bottom() + size.height() + margin <= screenGeometry.bottom());
     if (!hasRoomAbove && !hasRoomBelow && !hasRoomToLeft && !hasRoomToRight) {
         return QPoint();
     }
 
     int x = 0;
     int y = 0;
     if (hasRoomBelow || hasRoomAbove) {
         x = qMax(screenGeometry.left(), rect.center().x() - size.width() / 2);
         if (x + size.width() >= screenGeometry.right()) {
             x = screenGeometry.right() - size.width() + 1;
         }
         Q_ASSERT(x >= 0);
         if (hasRoomBelow) {
             y = rect.bottom() + margin;
         } else {
             y = rect.top() - size.height() - margin + 1;
         }
     } else {
         Q_ASSERT(hasRoomToLeft || hasRoomToRight);
         if (hasRoomToRight) {
             x = rect.right() + margin;
         } else {
             x = rect.left() - size.width() - margin + 1;
         }
         // Put the tooltip at the bottom of the screen. The x-coordinate has already
         // been adjusted, so that no overlapping with rect occurs.
         y = screenGeometry.bottom() - size.height() + 1;
     }
 
     return QPoint(x, y);
 }
 
 KToolTipWidget::KToolTipWidget(QWidget *parent)
     : QWidget(parent)
     , d(new KToolTipWidgetPrivate(this))
 {
     d->init();
 }
 
 KToolTipWidget::~KToolTipWidget()
 {
     d->restoreParent();
 }
 
 void KToolTipWidget::showAt(const QPoint &pos, QWidget *content, QWindow *transientParent)
 {
     d->addWidget(content);
     d->show(pos, transientParent);
 }
 
 void KToolTipWidget::showBelow(const QRect &rect, QWidget *content, QWindow *transientParent)
 {
     d->addWidget(content);
 
     const auto contentMargins = layout()->contentsMargins();
     const QSize screenSize = transientParent->screen()->geometry().size();
 
     content->setMaximumSize(screenSize.shrunkBy(contentMargins));
 
     d->show(d->centerBelow(rect, transientParent->screen()), transientParent);
 }
 
 int KToolTipWidget::hideDelay() const
 {
     return d->hideTimer.interval();
 }
 
 void KToolTipWidget::hideLater()
 {
     if (!isVisible()) {
         return;
     }
 
     if (hideDelay() > 0) {
         d->hideTimer.start();
     } else {
         hide();
     }
 }
 
 void KToolTipWidget::setHideDelay(int delay)
 {
     d->hideTimer.setInterval(delay);
 }
 
 void KToolTipWidget::enterEvent(QEvent *)
 {
     // Ignore hide delay and leave tooltip visible.
     if (hideDelay() > 0) {
         d->hideTimer.stop();
     } else {
         hide();
     }
 }
 
 void KToolTipWidget::hideEvent(QHideEvent *)
 {
     d->removeWidget();
     // Give time to the content widget to get his own hide event.
     QTimer::singleShot(0, this, &KToolTipWidget::hidden);
 }
 
 void KToolTipWidget::leaveEvent(QEvent *)
 {
     // Don't bother starting the hide timer, we are done.
     hide();
 }
 
 void KToolTipWidget::paintEvent(QPaintEvent *event)
 {
     QStylePainter painter(this);
     painter.setClipRegion(event->region());
     QStyleOptionFrame option;
     option.initFrom(this);
     painter.drawPrimitive(QStyle::PE_PanelTipLabel, option);
     painter.end();
 
     QWidget::paintEvent(event);
 }
 
 #include "moc_ktooltipwidget.cpp"