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105 lines
2.6 KiB
C++
105 lines
2.6 KiB
C++
/*
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SPDX-FileCopyrightText: 2013 Eike Hein <hein@kde.org>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "draghelper.h"
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#include <QApplication>
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#include <QDrag>
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#include <QMimeData>
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#include <QQuickItem>
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#include <QQuickWindow>
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#include <QTimer>
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DragHelper::DragHelper(QObject *parent)
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: QObject(parent)
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, m_dragIconSize(32)
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, m_dragging(false)
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{
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}
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DragHelper::~DragHelper()
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{
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}
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int DragHelper::dragIconSize() const
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{
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return m_dragIconSize;
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}
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void DragHelper::setDragIconSize(int size)
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{
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if (m_dragIconSize != size) {
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m_dragIconSize = size;
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Q_EMIT dragIconSizeChanged();
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}
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}
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bool DragHelper::isDrag(int oldX, int oldY, int newX, int newY) const
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{
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return ((QPoint(oldX, oldY) - QPoint(newX, newY)).manhattanLength() >= QApplication::startDragDistance());
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}
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void DragHelper::startDrag(QQuickItem *item, const QUrl &url, const QIcon &icon, const QString &extraMimeType, const QString &extraMimeData)
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{
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// This allows the caller to return, making sure we don't crash if
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// the caller is destroyed mid-drag (as can happen due to a sycoca
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// change).
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QMetaObject::invokeMethod(this,
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"doDrag",
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Qt::QueuedConnection,
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Q_ARG(QQuickItem *, item),
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Q_ARG(QUrl, url),
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Q_ARG(QIcon, icon),
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Q_ARG(QString, extraMimeType),
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Q_ARG(QString, extraMimeData));
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}
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void DragHelper::doDrag(QQuickItem *item, const QUrl &url, const QIcon &icon, const QString &extraMimeType, const QString &extraMimeData)
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{
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setDragging(true);
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if (item && item->window() && item->window()->mouseGrabberItem()) {
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item->window()->mouseGrabberItem()->ungrabMouse();
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}
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QDrag *drag = new QDrag(item);
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QMimeData *mimeData = new QMimeData();
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if (!url.isEmpty()) {
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mimeData->setUrls(QList<QUrl>() << url);
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}
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if (!extraMimeType.isEmpty() && !extraMimeData.isEmpty()) {
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mimeData->setData(extraMimeType, extraMimeData.toLatin1());
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}
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drag->setMimeData(mimeData);
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if (!icon.isNull()) {
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drag->setPixmap(icon.pixmap(m_dragIconSize, m_dragIconSize));
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}
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drag->exec();
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Q_EMIT dropped();
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// Ensure dragging is still true when onRelease is called.
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QTimer::singleShot(0, qApp, [this] {
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setDragging(false);
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});
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}
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void DragHelper::setDragging(bool dragging)
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{
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if (m_dragging == dragging)
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return;
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m_dragging = dragging;
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Q_EMIT draggingChanged();
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}
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