| 1 | /* |
|---|---|
| 2 | This file is part of the KDE libraries |
| 3 | SPDX-FileCopyrightText: 2000 Carsten Pfeiffer <pfeiffer@kde.org> |
| 4 | |
| 5 | SPDX-License-Identifier: LGPL-2.0-or-later |
| 6 | */ |
| 7 | |
| 8 | #include "kdragwidgetdecorator.h" |
| 9 | |
| 10 | #include <QApplication> |
| 11 | #include <QDrag> |
| 12 | #include <QMouseEvent> |
| 13 | #include <QWidget> |
| 14 | |
| 15 | class KDragWidgetDecoratorBasePrivate |
| 16 | { |
| 17 | public: |
| 18 | bool dragEnabled = true; |
| 19 | QWidget *decoratedWidget = nullptr; |
| 20 | QPoint startPos; |
| 21 | }; |
| 22 | |
| 23 | KDragWidgetDecoratorBase::KDragWidgetDecoratorBase(QWidget *parent) |
| 24 | : QObject(parent) |
| 25 | , d(new KDragWidgetDecoratorBasePrivate) |
| 26 | { |
| 27 | parent->installEventFilter(filterObj: this); |
| 28 | d->decoratedWidget = parent; |
| 29 | } |
| 30 | |
| 31 | KDragWidgetDecoratorBase::~KDragWidgetDecoratorBase() = default; |
| 32 | |
| 33 | bool KDragWidgetDecoratorBase::isDragEnabled() const |
| 34 | { |
| 35 | return d->dragEnabled; |
| 36 | } |
| 37 | |
| 38 | void KDragWidgetDecoratorBase::setDragEnabled(bool enable) |
| 39 | { |
| 40 | d->dragEnabled = enable; |
| 41 | } |
| 42 | |
| 43 | bool KDragWidgetDecoratorBase::eventFilter(QObject *watched, QEvent *event) |
| 44 | { |
| 45 | Q_UNUSED(watched) // except in Q_ASSERT |
| 46 | Q_ASSERT(watched == d->decoratedWidget); |
| 47 | |
| 48 | if (!d->dragEnabled) { |
| 49 | return false; |
| 50 | } |
| 51 | |
| 52 | if (event->type() == QEvent::MouseButtonPress) { |
| 53 | QMouseEvent *e = static_cast<QMouseEvent *>(event); |
| 54 | d->startPos = e->pos(); |
| 55 | |
| 56 | } else if (event->type() == QEvent::MouseMove) { |
| 57 | QMouseEvent *e = static_cast<QMouseEvent *>(event); |
| 58 | if ((e->buttons() & Qt::LeftButton) && (e->pos() - d->startPos).manhattanLength() > QApplication::startDragDistance()) { |
| 59 | startDrag(); |
| 60 | d->decoratedWidget->setProperty(name: "down", value: false); |
| 61 | return true; |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | return false; |
| 66 | } |
| 67 | |
| 68 | QWidget *KDragWidgetDecoratorBase::decoratedWidget() const |
| 69 | { |
| 70 | return d->decoratedWidget; |
| 71 | } |
| 72 | |
| 73 | QDrag *KDragWidgetDecoratorBase::dragObject() |
| 74 | { |
| 75 | return nullptr; |
| 76 | } |
| 77 | |
| 78 | void KDragWidgetDecoratorBase::startDrag() |
| 79 | { |
| 80 | QDrag *drag = dragObject(); |
| 81 | if (drag) { |
| 82 | drag->exec(supportedActions: Qt::CopyAction); |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | #include "moc_kdragwidgetdecorator.cpp" |
| 87 |