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| ** This file is part of the examples of the Qt Toolkit. |
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| |
| #include "maskedmousearea.h" |
| |
| #include <QStyleHints> |
| #include <QGuiApplication> |
| #include <qqmlfile.h> |
| |
| MaskedMouseArea::MaskedMouseArea(QQuickItem *parent) |
| : QQuickItem(parent), |
| m_pressed(false), |
| m_alphaThreshold(0.0), |
| m_containsMouse(false) |
| { |
| setAcceptHoverEvents(true); |
| setAcceptedMouseButtons(Qt::LeftButton); |
| } |
| |
| void MaskedMouseArea::setPressed(bool pressed) |
| { |
| if (m_pressed != pressed) { |
| m_pressed = pressed; |
| emit pressedChanged(); |
| } |
| } |
| |
| void MaskedMouseArea::setContainsMouse(bool containsMouse) |
| { |
| if (m_containsMouse != containsMouse) { |
| m_containsMouse = containsMouse; |
| emit containsMouseChanged(); |
| } |
| } |
| |
| void MaskedMouseArea::setMaskSource(const QUrl &source) |
| { |
| if (m_maskSource != source) { |
| m_maskSource = source; |
| m_maskImage = QImage(QQmlFile::urlToLocalFileOrQrc(source)); |
| emit maskSourceChanged(); |
| } |
| } |
| |
| void MaskedMouseArea::setAlphaThreshold(qreal threshold) |
| { |
| if (m_alphaThreshold != threshold) { |
| m_alphaThreshold = threshold; |
| emit alphaThresholdChanged(); |
| } |
| } |
| |
| bool MaskedMouseArea::contains(const QPointF &point) const |
| { |
| if (!QQuickItem::contains(point) || m_maskImage.isNull()) |
| return false; |
| |
| QPoint p = point.toPoint(); |
| |
| if (p.x() < 0 || p.x() >= m_maskImage.width() || |
| p.y() < 0 || p.y() >= m_maskImage.height()) |
| return false; |
| |
| qreal r = qBound<int>(0, m_alphaThreshold * 255, 255); |
| return qAlpha(m_maskImage.pixel(p)) > r; |
| } |
| |
| void MaskedMouseArea::mousePressEvent(QMouseEvent *event) |
| { |
| setPressed(true); |
| m_pressPoint = event->pos(); |
| emit pressed(); |
| } |
| |
| void MaskedMouseArea::mouseReleaseEvent(QMouseEvent *event) |
| { |
| setPressed(false); |
| emit released(); |
| |
| const int threshold = qApp->styleHints()->startDragDistance(); |
| const bool isClick = (threshold >= qAbs(event->x() - m_pressPoint.x()) && |
| threshold >= qAbs(event->y() - m_pressPoint.y())); |
| |
| if (isClick) |
| emit clicked(); |
| } |
| |
| void MaskedMouseArea::mouseUngrabEvent() |
| { |
| setPressed(false); |
| emit canceled(); |
| } |
| |
| void MaskedMouseArea::hoverEnterEvent(QHoverEvent *event) |
| { |
| Q_UNUSED(event); |
| setContainsMouse(true); |
| } |
| |
| void MaskedMouseArea::hoverLeaveEvent(QHoverEvent *event) |
| { |
| Q_UNUSED(event); |
| setContainsMouse(false); |
| } |