105 lines
2.5 KiB
C++
105 lines
2.5 KiB
C++
// Copyright (C) 2017 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
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#include "maskedmousearea.h"
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#include <QStyleHints>
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#include <QGuiApplication>
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#include <qqmlfile.h>
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MaskedMouseArea::MaskedMouseArea(QQuickItem *parent)
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: QQuickItem(parent),
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m_pressed(false),
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m_alphaThreshold(0.0),
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m_containsMouse(false)
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{
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setAcceptHoverEvents(true);
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setAcceptedMouseButtons(Qt::LeftButton);
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}
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void MaskedMouseArea::setPressed(bool pressed)
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{
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if (m_pressed != pressed) {
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m_pressed = pressed;
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emit pressedChanged();
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}
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}
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void MaskedMouseArea::setContainsMouse(bool containsMouse)
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{
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if (m_containsMouse != containsMouse) {
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m_containsMouse = containsMouse;
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emit containsMouseChanged();
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}
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}
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void MaskedMouseArea::setMaskSource(const QUrl &source)
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{
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if (m_maskSource != source) {
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m_maskSource = source;
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m_maskImage = QImage(QQmlFile::urlToLocalFileOrQrc(source));
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emit maskSourceChanged();
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}
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}
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void MaskedMouseArea::setAlphaThreshold(qreal threshold)
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{
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if (m_alphaThreshold != threshold) {
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m_alphaThreshold = threshold;
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emit alphaThresholdChanged();
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}
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}
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bool MaskedMouseArea::contains(const QPointF &point) const
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{
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if (!QQuickItem::contains(point) || m_maskImage.isNull())
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return false;
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QPoint p = point.toPoint();
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if (p.x() < 0 || p.x() >= m_maskImage.width() ||
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p.y() < 0 || p.y() >= m_maskImage.height())
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return false;
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qreal r = qBound<int>(0, m_alphaThreshold * 255, 255);
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return qAlpha(m_maskImage.pixel(p)) > r;
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}
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void MaskedMouseArea::mousePressEvent(QMouseEvent *event)
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{
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setPressed(true);
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m_pressPoint = event->position().toPoint();
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emit pressed();
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}
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void MaskedMouseArea::mouseReleaseEvent(QMouseEvent *event)
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{
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setPressed(false);
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emit released();
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const int threshold = qApp->styleHints()->startDragDistance();
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const bool isClick = (threshold >= qAbs(event->position().toPoint().x() - m_pressPoint.x()) &&
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threshold >= qAbs(event->position().toPoint().y() - m_pressPoint.y()));
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if (isClick)
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emit clicked();
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}
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void MaskedMouseArea::mouseUngrabEvent()
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{
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setPressed(false);
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emit canceled();
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}
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void MaskedMouseArea::hoverEnterEvent(QHoverEvent *event)
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{
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Q_UNUSED(event);
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setContainsMouse(true);
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}
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void MaskedMouseArea::hoverLeaveEvent(QHoverEvent *event)
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{
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Q_UNUSED(event);
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setContainsMouse(false);
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}
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