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/*
* Copyright (c) 2018 Alvin Wong <alvinhochun@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef KO_TOOLBOX_SCROLL_AREA_H
#define KO_TOOLBOX_SCROLL_AREA_H
#include "KoToolBox_p.h"
#include "KoToolBoxLayout_p.h"
#include <QScrollArea>
#include <QScrollBar>
#include <QScroller>
#include <QStyleOption>
#include <QToolButton>
#include <KoKineticScroller.h>
class KoToolBoxScrollArea : public QScrollArea
{
Q_OBJECT
public:
KoToolBoxScrollArea(KoToolBox *toolBox, QWidget *parent)
: QScrollArea(parent)
, m_toolBox(toolBox)
, m_orientation(Qt::Vertical)
, m_scrollPrev(new QToolButton(this))
, m_scrollNext(new QToolButton(this))
{
setFrameShape(QFrame::NoFrame);
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
m_toolBox->setOrientation(m_orientation);
setWidget(m_toolBox);
m_scrollPrev->setAutoRepeat(true);
m_scrollPrev->setAutoFillBackground(true);
m_scrollPrev->setFocusPolicy(Qt::NoFocus);
connect(m_scrollPrev, &QToolButton::clicked, this, &KoToolBoxScrollArea::doScrollPrev);
m_scrollNext->setAutoRepeat(true);
m_scrollNext->setAutoFillBackground(true);
m_scrollNext->setFocusPolicy(Qt::NoFocus);
connect(m_scrollNext, &QToolButton::clicked, this, &KoToolBoxScrollArea::doScrollNext);
QScroller *scroller = KoKineticScroller::createPreconfiguredScroller(this);
if (!scroller) {
QScroller::grabGesture(viewport(), QScroller::MiddleMouseButtonGesture);
QScroller *scroller = QScroller::scroller(viewport());
QScrollerProperties sp = scroller->scrollerProperties();
sp.setScrollMetric(QScrollerProperties::MaximumVelocity, 0.0);
sp.setScrollMetric(QScrollerProperties::OvershootDragResistanceFactor, 0.1);
sp.setScrollMetric(QScrollerProperties::OvershootDragDistanceFactor, 0.1);
sp.setScrollMetric(QScrollerProperties::OvershootScrollDistanceFactor, 0.0);
sp.setScrollMetric(QScrollerProperties::OvershootScrollTime, 0.4);
scroller->setScrollerProperties(sp);
}
connect(scroller, SIGNAL(stateChanged(QScroller::State)), this, SLOT(slotScrollerStateChange(QScroller::State)));
}
void setOrientation(Qt::Orientation orientation)
{
if (orientation == m_orientation) {
return;
}
m_orientation = orientation;
m_toolBox->setOrientation(orientation);
layoutItems();
}
Qt::Orientation orientation() const
{
return m_orientation;
}
QSize minimumSizeHint() const override
{
return m_toolBox->minimumSizeHint();
}
QSize sizeHint() const override
{
return m_toolBox->sizeHint();
}
public Q_SLOTS:
void slotScrollerStateChange(QScroller::State state){ KoKineticScroller::updateCursor(this, state); }
protected:
bool event(QEvent *event) override
{
if (event->type() == QEvent::LayoutRequest) {
// LayoutRequest can be triggered by icon changes, so resize the toolbox
layoutItems();
// The toolbox might have changed the sizeHint and minimumSizeHint
updateGeometry();
}
return QScrollArea::event(event);
}
void resizeEvent(QResizeEvent *event) override
{
layoutItems();
QScrollArea::resizeEvent(event);
updateScrollButtons();
}
void wheelEvent(QWheelEvent *event) override
{
if (m_orientation == Qt::Vertical) {
QApplication::sendEvent(verticalScrollBar(), event);
} else {
QApplication::sendEvent(horizontalScrollBar(), event);
}
}
void scrollContentsBy(int dx, int dy) override
{
QScrollArea::scrollContentsBy(dx, dy);
updateScrollButtons();
}
private Q_SLOTS:
void doScrollPrev()
{
if (m_orientation == Qt::Vertical) {
verticalScrollBar()->triggerAction(QAbstractSlider::SliderSingleStepSub);
} else {
horizontalScrollBar()->triggerAction(QAbstractSlider::SliderSingleStepSub);
}
}
void doScrollNext()
{
if (m_orientation == Qt::Vertical) {
verticalScrollBar()->triggerAction(QAbstractSlider::SliderSingleStepAdd);
} else {
horizontalScrollBar()->triggerAction(QAbstractSlider::SliderSingleStepAdd);
}
}
private:
int scrollButtonWidth() const
{
QStyleOption opt;
opt.init(this);
return style()->pixelMetric(QStyle::PM_TabBarScrollButtonWidth, &opt, this);
}
void layoutItems()
{
const KoToolBoxLayout *l = m_toolBox->toolBoxLayout();
QSize newSize = viewport()->size();
if (m_orientation == Qt::Vertical) {
newSize.setHeight(l->heightForWidth(newSize.width()));
} else {
newSize.setWidth(l->widthForHeight(newSize.height()));
}
m_toolBox->resize(newSize);
updateScrollButtons();
}
void updateScrollButtons()
{
// We move the scroll buttons outside the widget rect instead of setting
// the visibility, because setting the visibility triggers a relayout
// of QAbstractScrollArea, which occasionally causes an offset bug when
// QScroller performs the overshoot animation. (Overshoot is done by
// moving the viewport widget, but the viewport position is reset during
// a relayout.)
const int scrollButtonWidth = this->scrollButtonWidth();
if (m_orientation == Qt::Vertical) {
m_scrollPrev->setArrowType(Qt::UpArrow);
m_scrollPrev->setEnabled(verticalScrollBar()->value() != verticalScrollBar()->minimum());
if (m_scrollPrev->isEnabled()) {
m_scrollPrev->setGeometry(0, 0, width(), scrollButtonWidth);
} else {
m_scrollPrev->setGeometry(-width(), 0, width(), scrollButtonWidth);
}
m_scrollNext->setArrowType(Qt::DownArrow);
m_scrollNext->setEnabled(verticalScrollBar()->value() != verticalScrollBar()->maximum());
if (m_scrollNext->isEnabled()) {
m_scrollNext->setGeometry(0, height() - scrollButtonWidth, width(), scrollButtonWidth);
} else {
m_scrollNext->setGeometry(-width(), height() - scrollButtonWidth, width(), scrollButtonWidth);
}
} else {
m_scrollPrev->setArrowType(Qt::LeftArrow);
m_scrollPrev->setEnabled(horizontalScrollBar()->value() != horizontalScrollBar()->minimum());
if (m_scrollPrev->isEnabled()) {
m_scrollPrev->setGeometry(0, 0, scrollButtonWidth, height());
} else {
m_scrollPrev->setGeometry(0, -height(), scrollButtonWidth, height());
}
m_scrollNext->setArrowType(Qt::RightArrow);
m_scrollNext->setEnabled(horizontalScrollBar()->value() != horizontalScrollBar()->maximum());
if (m_scrollNext->isEnabled()) {
m_scrollNext->setGeometry(width() - scrollButtonWidth, 0, scrollButtonWidth, height());
} else {
m_scrollNext->setGeometry(width() - scrollButtonWidth, -height(), scrollButtonWidth, height());
}
}
}
KoToolBox *m_toolBox;
Qt::Orientation m_orientation;
QToolButton *m_scrollPrev;
QToolButton *m_scrollNext;
};
#endif // KO_TOOLBOX_SCROLL_AREA_H
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