File indexing completed on 2024-04-28 03:59:04

 /*
     This file is part of the KDE libraries
     SPDX-FileCopyrightText: 2000 Carsten Pfeiffer <pfeiffer@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "kdragwidgetdecorator.h"
 
 #include <QApplication>
 #include <QDrag>
 #include <QMouseEvent>
 #include <QWidget>
 
 class KDragWidgetDecoratorBasePrivate
 {
 public:
     bool dragEnabled = true;
     QWidget *decoratedWidget = nullptr;
     QPoint startPos;
 };
 
 KDragWidgetDecoratorBase::KDragWidgetDecoratorBase(QWidget *parent)
     : QObject(parent)
     , d(new KDragWidgetDecoratorBasePrivate)
 {
     parent->installEventFilter(this);
     d->decoratedWidget = parent;
 }
 
 KDragWidgetDecoratorBase::~KDragWidgetDecoratorBase() = default;
 
 bool KDragWidgetDecoratorBase::isDragEnabled() const
 {
     return d->dragEnabled;
 }
 
 void KDragWidgetDecoratorBase::setDragEnabled(bool enable)
 {
     d->dragEnabled = enable;
 }
 
 bool KDragWidgetDecoratorBase::eventFilter(QObject *watched, QEvent *event)
 {
     Q_UNUSED(watched) // except in Q_ASSERT
     Q_ASSERT(watched == d->decoratedWidget);
 
     if (!d->dragEnabled) {
         return false;
     }
 
     if (event->type() == QEvent::MouseButtonPress) {
         QMouseEvent *e = static_cast<QMouseEvent *>(event);
         d->startPos = e->pos();
 
     } else if (event->type() == QEvent::MouseMove) {
         QMouseEvent *e = static_cast<QMouseEvent *>(event);
         if ((e->buttons() & Qt::LeftButton) && (e->pos() - d->startPos).manhattanLength() > QApplication::startDragDistance()) {
             startDrag();
             d->decoratedWidget->setProperty("down", false);
             return true;
         }
     }
 
     return false;
 }
 
 QWidget *KDragWidgetDecoratorBase::decoratedWidget() const
 {
     return d->decoratedWidget;
 }
 
 QDrag *KDragWidgetDecoratorBase::dragObject()
 {
     return nullptr;
 }
 
 void KDragWidgetDecoratorBase::startDrag()
 {
     QDrag *drag = dragObject();
     if (drag) {
         drag->exec(Qt::CopyAction);
     }
 }
 
 #include "moc_kdragwidgetdecorator.cpp"