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99 lines
3.3 KiB
99 lines
3.3 KiB
/*****************************************************************************
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* Copyright (C) 2021 VLC authors and VideoLAN
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* ( at your option ) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifndef FLICKABLE_SCROLL_HANDLER_HPP
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#define FLICKABLE_SCROLL_HANDLER_HPP
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#include <QObject>
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#include <QQmlProperty>
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#include <QPointer>
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#include <QQuickItem>
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#include <QQmlParserStatus>
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class FlickableScrollHandler : public QObject, public QQmlParserStatus
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{
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Q_OBJECT
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Q_PROPERTY(QObject* parent READ parent NOTIFY initialized FINAL)
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Q_PROPERTY(qreal scaleFactor READ scaleFactor WRITE setScaleFactor NOTIFY scaleFactorChanged FINAL)
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Q_PROPERTY(qreal effectiveScaleFactor READ effectiveScaleFactor NOTIFY effectiveScaleFactorChanged FINAL)
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Q_PROPERTY(bool enabled READ enabled WRITE setEnabled NOTIFY enabledChanged FINAL)
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Q_PROPERTY(bool fallbackScroll MEMBER m_fallbackScroll NOTIFY fallbackScrollChanged FINAL)
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Q_PROPERTY(bool handleOnlyPixelDelta MEMBER m_handleOnlyPixelDelta NOTIFY handleOnlyPixelDeltaChanged FINAL)
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Q_INTERFACES(QQmlParserStatus)
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public:
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explicit FlickableScrollHandler(QObject *parent = nullptr);
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~FlickableScrollHandler();
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qreal scaleFactor() const;
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qreal effectiveScaleFactor() const;
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bool enabled() const;
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void setScaleFactor(qreal newScaleFactor);
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void setEnabled(bool newEnabled);
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void classBegin() override;
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void componentComplete() override;
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signals:
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void initialized();
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void scaleFactorChanged();
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void enabledChanged();
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void effectiveScaleFactorChanged();
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void fallbackScrollChanged();
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void handleOnlyPixelDeltaChanged();
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private slots:
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void adjustScrollBarV();
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void adjustScrollBarH();
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private:
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void attach();
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void detach();
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bool eventFilter(QObject *watched, QEvent *event) override;
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private:
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QPointer<QQuickItem> m_target = nullptr;
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qreal m_scaleFactor = 1.;
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qreal m_effectiveScaleFactor;
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bool m_enabled = true;
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bool m_fallbackScroll = false;
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QQmlProperty m_propertyContentX, m_propertyContentY;
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QQmlProperty m_propertyContentHeight, m_propertyContentWidth;
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QQmlProperty m_propertyHeight, m_propertyWidth;
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struct ScrollBar {
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QQmlProperty scrollBar;
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QQmlProperty stepSize;
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QMetaMethod increaseMethod;
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QMetaMethod decreaseMethod;
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QQuickItem* item = nullptr;
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bool valid() const { return item != nullptr; }
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} m_scrollBarV, m_scrollBarH;
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void adjustScrollBar(ScrollBar& scrollBar);
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bool m_handleOnlyPixelDelta = false;
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};
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#endif // FLICKABLE_SCROLL_HANDLER_HPP
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