437 lines
12 KiB
C++
437 lines
12 KiB
C++
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#include "toonzqt/dvscrollwidget.h"
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// TnzQt includes
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#include "toonzqt/freelayout.h"
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// Qt includes
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#include <QLayout>
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#include <QPushButton>
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#include <QPropertyAnimation>
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#include <QResizeEvent>
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#include <QMouseEvent>
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#include <QTimer>
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// STD includes
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#include <numeric>
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//****************************************************************************
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// Local namespace stuff
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//****************************************************************************
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namespace
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{
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class ScrollLayout : public DummyLayout
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{
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DvScrollWidget *m_scrollWidget;
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public:
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ScrollLayout(DvScrollWidget *scrollWidget)
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: m_scrollWidget(scrollWidget)
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{
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assert(m_scrollWidget);
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}
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QSize minimumSize() const
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{
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struct locals {
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inline static QSize expand(const QSize &size, const QLayoutItem *item)
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{
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return size.expandedTo(item->minimumSize());
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}
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};
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QSize minSize = std::accumulate(m_items.begin(), m_items.end(),
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QSize(), locals::expand);
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return (m_scrollWidget->getOrientation() == Qt::Horizontal) ? QSize(0, minSize.height()) : QSize(minSize.width(), 0);
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}
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QSize maximumSize() const
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{
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struct locals {
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inline static QSize bound(const QSize &size, const QLayoutItem *item)
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{
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return size.boundedTo(item->minimumSize());
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}
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};
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QSize maxSize = std::accumulate(m_items.begin(), m_items.end(),
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QSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX), locals::bound);
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return (m_scrollWidget->getOrientation() == Qt::Horizontal) ? QSize(QWIDGETSIZE_MAX, maxSize.height()) : QSize(maxSize.width(), QWIDGETSIZE_MAX);
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}
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void setGeometry(const QRect &r)
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{
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const Qt::Orientation orientation = m_scrollWidget->getOrientation();
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QList<QLayoutItem *>::const_iterator it, iEnd = m_items.end();
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for (it = m_items.begin(); it != iEnd; ++it) {
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QLayoutItem *item = *it;
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QSize targetSize = item->sizeHint();
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if (orientation & item->expandingDirections()) {
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if (orientation & Qt::Horizontal)
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targetSize.setWidth(r.width());
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else
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targetSize.setHeight(r.height());
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}
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const QSize &minSize = item->minimumSize(),
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&maxSize = item->maximumSize();
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targetSize.setWidth(tcrop(targetSize.width(), minSize.width(), maxSize.width()));
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targetSize.setHeight(tcrop(targetSize.height(), minSize.height(), maxSize.height()));
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const QRect &geom = item->geometry();
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if (geom.size() != targetSize)
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item->setGeometry(QRect(geom.topLeft(), targetSize));
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}
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m_scrollWidget->scroll(0); // Refresh scroll buttons visibility
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}
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};
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//==============================================================================
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qreal heldScrollEasing(qreal progress)
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{
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//Equilibrate sum of Linear and InQuad
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return 0.5 * progress * (1.0 + progress);
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}
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} // namespace
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//****************************************************************************
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// DvScrollWidget implementation
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//****************************************************************************
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DvScrollWidget::DvScrollWidget(QWidget *parent, Qt::Orientation orientation)
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: QFrame(parent), m_content(0), m_animation(0), m_clickEase(QEasingCurve::OutCubic), m_holdEase(QEasingCurve::Linear), m_backwardTimer(new QTimer(this)), m_forwardTimer(new QTimer(this)), m_pressed(false), m_heldRelease(false), m_heldClick(false)
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{
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ScrollLayout *scrollLayout = new ScrollLayout(this);
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setLayout(scrollLayout);
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// At the toolbar sides, add scroll buttons
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m_scrollBackward = new QPushButton(this); // NOTE: Not being managed by the scroll layout.
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m_scrollBackward->setFixedSize(24, 24); // It's not necessary. They are not part
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m_scrollBackward->setFocusPolicy(Qt::NoFocus); // of the content.
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m_scrollForward = new QPushButton(this); // Observe that the parent widget must
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m_scrollForward->setFixedSize(24, 24); // therefore be explicitly supplied.
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m_scrollForward->setFocusPolicy(Qt::NoFocus);
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setOrientation(orientation);
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m_scrollBackward->move(0, 0);
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m_backwardTimer->setInterval(450);
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m_forwardTimer->setInterval(450);
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m_backwardTimer->setSingleShot(true);
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m_forwardTimer->setSingleShot(true);
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connect(m_scrollBackward, SIGNAL(clicked(bool)), this, SLOT(scrollBackward()));
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connect(m_scrollForward, SIGNAL(clicked(bool)), this, SLOT(scrollForward()));
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connect(m_backwardTimer, SIGNAL(timeout()), this, SLOT(holdBackward()));
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connect(m_forwardTimer, SIGNAL(timeout()), this, SLOT(holdForward()));
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connect(m_scrollBackward, SIGNAL(pressed()), m_backwardTimer, SLOT(start()));
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connect(m_scrollForward, SIGNAL(pressed()), m_forwardTimer, SLOT(start()));
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connect(m_scrollBackward, SIGNAL(released()), this, SLOT(releaseBackward()));
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connect(m_scrollForward, SIGNAL(released()), this, SLOT(releaseForward()));
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::setWidget(QWidget *widget)
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{
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// Delete currently set widget, if any
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QLayout *lay = layout();
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while (QLayoutItem *item = lay->takeAt(0)) // Should be 1 item only - while is just to be pedant
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{
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assert(item->widget());
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delete item->widget(); // The item DOES NOT own the widget.
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delete item; // The parent widget (this) does - this
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} // is by Qt's manual.
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// Add widget
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lay->addWidget(widget);
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m_content = widget;
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m_content->lower(); // Needs to be below the scroll buttons.
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// Seemingly not working on Mac (see showEvent).
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assert(widget->parent() == this);
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// Use animations to make scrolling 'smooth'
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delete m_animation;
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m_animation = new QPropertyAnimation(m_content, "pos");
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connect(m_animation, SIGNAL(stateChanged(QAbstractAnimation::State, QAbstractAnimation::State)),
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this, SLOT(updateButtonsVisibility()));
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::setOrientation(Qt::Orientation orientation)
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{
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if ((m_horizontal = (orientation == Qt::Horizontal))) {
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setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
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m_scrollBackward->setObjectName("ScrollLeftButton");
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m_scrollForward->setObjectName("ScrollRightButton");
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} else {
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setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Preferred);
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m_scrollBackward->setObjectName("ScrollUpButton");
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m_scrollForward->setObjectName("ScrollDownButton");
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}
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}
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//------------------------------------------------------------------------------
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Qt::Orientation DvScrollWidget::getOrientation() const
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{
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return m_horizontal ? Qt::Horizontal : Qt::Vertical;
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::setEasing(QEasingCurve clickEase, QEasingCurve holdPressEase)
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{
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m_clickEase = clickEase;
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m_holdEase = holdPressEase;
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::scroll(int dx, int duration, QEasingCurve ease)
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{
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if (m_content)
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scrollTo(m_horizontal ? m_content->x() + dx : m_content->y() + dx, duration, ease);
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::scrollTo(int pos, int duration, QEasingCurve ease)
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{
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if (!m_content)
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return;
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// Retrieve the contents' bounds
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QRect bounds(m_content->pos(), m_content->size());
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QPoint newPos;
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if (m_horizontal) {
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newPos = QPoint(pos, 0);
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int minPos = width() - bounds.width();
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if (newPos.x() <= minPos)
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newPos.setX(minPos);
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if (newPos.x() >= 0)
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newPos.setX(0);
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} else {
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newPos = QPoint(0, pos);
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int minPos = height() - bounds.height();
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if (newPos.y() <= minPos)
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newPos.setY(minPos);
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if (newPos.y() >= 0)
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newPos.setY(0);
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}
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if (duration > 0) {
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m_animation->stop();
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m_animation->setEasingCurve(ease);
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m_animation->setStartValue(bounds.topLeft());
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m_animation->setEndValue(newPos);
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m_animation->setDuration(duration);
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m_animation->start();
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} else {
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m_content->move(newPos);
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updateButtonsVisibility();
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}
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::updateButtonsVisibility()
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{
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if ((!m_content) || (m_animation->state() == QPropertyAnimation::Running))
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return;
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QRect bounds(m_content->pos(), m_content->size());
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if (m_horizontal) {
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if (bounds.right() <= width()) {
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m_scrollForward->setDown(false);
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m_scrollForward->hide();
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m_heldRelease = m_heldClick = false;
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} else
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m_scrollForward->show();
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if (bounds.left() >= 0) {
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m_scrollBackward->setDown(false);
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m_scrollBackward->hide();
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m_heldRelease = m_heldClick = false;
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} else
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m_scrollBackward->show();
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} else {
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if (bounds.bottom() <= height()) {
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m_scrollForward->setDown(false);
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m_scrollForward->hide();
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m_heldRelease = m_heldClick = false;
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} else
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m_scrollForward->show();
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if (bounds.top() >= 0) {
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m_scrollBackward->setDown(false);
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m_scrollBackward->hide();
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m_heldRelease = m_heldClick = false;
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} else
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m_scrollBackward->show();
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}
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::showEvent(QShowEvent *se)
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{
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// These are necessary on Mac.
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m_scrollBackward->raise();
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m_scrollForward->raise();
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::resizeEvent(QResizeEvent *re)
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{
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QWidget::resizeEvent(re);
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scroll(0);
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if (m_horizontal) {
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m_scrollBackward->setFixedSize(m_scrollBackward->width(), height());
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m_scrollForward->setFixedSize(m_scrollForward->width(), height());
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m_scrollForward->move(re->size().width() - m_scrollForward->width(), 0);
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} else {
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m_scrollBackward->setFixedSize(width(), m_scrollBackward->height());
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m_scrollForward->setFixedSize(width(), m_scrollForward->height());
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m_scrollForward->move(0, re->size().height() - m_scrollForward->height());
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}
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::mousePressEvent(QMouseEvent *me)
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{
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m_pressed = true;
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m_mousePos = m_horizontal ? me->x() : me->y();
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me->accept();
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::mouseMoveEvent(QMouseEvent *me)
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{
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if (!m_pressed)
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return;
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if (m_horizontal) {
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scroll(me->x() - m_mousePos);
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m_mousePos = me->x();
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} else {
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scroll(me->y() - m_mousePos);
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m_mousePos = me->y();
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}
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me->accept();
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::mouseReleaseEvent(QMouseEvent *me)
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{
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m_pressed = false;
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me->accept();
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::holdBackward()
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{
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if (!m_content)
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return;
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m_heldRelease = m_heldClick = true;
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QRect bounds(m_content->pos(), m_content->size());
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int spaceLeft = -(m_horizontal ? bounds.left() : bounds.top());
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QEasingCurve ease;
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ease.setCustomType(&heldScrollEasing);
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scrollTo(0, spaceLeft * 10, ease); // 100 pix per second
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::holdForward()
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{
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if (!m_content)
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return;
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m_heldRelease = m_heldClick = true;
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QRect bounds(m_content->pos(), m_content->size());
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int pos = m_horizontal ? width() - bounds.width() : height() - bounds.height();
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int spaceLeft = (m_horizontal ? bounds.left() : bounds.top()) - pos;
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QEasingCurve ease;
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ease.setCustomType(&heldScrollEasing);
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scrollTo(pos, spaceLeft * 10, ease); // 100 pix per second
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::releaseBackward()
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{
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m_backwardTimer->stop();
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if (m_heldRelease)
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m_animation->stop();
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m_heldRelease = false;
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::releaseForward()
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{
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m_forwardTimer->stop();
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if (m_heldRelease)
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m_animation->stop();
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m_heldRelease = false;
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::scrollBackward()
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{
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if (!m_heldClick)
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scroll(0.5 * (m_horizontal ? width() : height()), 300);
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m_heldClick = false;
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}
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//------------------------------------------------------------------------------
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void DvScrollWidget::scrollForward()
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{
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if (!m_heldClick)
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scroll(-0.5 * (m_horizontal ? width() : height()), 300);
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m_heldClick = false;
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}
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