File indexing completed on 2024-04-28 15:30:59

 /*
     SPDX-FileCopyrightText: 2013-2018 Dominik Haumann <dhaumann@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "katetextanimation.h"
 
 #include "katedocument.h"
 #include "katerenderer.h"
 #include "kateview.h"
 #include "kateviewinternal.h"
 
 #include <QPainter>
 #include <QPointF>
 #include <QRect>
 #include <QSizeF>
 #include <QTimeLine>
 
 KateTextAnimation::KateTextAnimation(KTextEditor::Range range, KTextEditor::Attribute::Ptr attribute, KateViewInternal *view)
     : QObject(view)
     , m_range(range)
     , m_attribute(std::move(attribute))
     , m_doc(view->view()->doc())
     , m_view(view)
     , m_timeLine(new QTimeLine(250, this))
     , m_value(0.0)
 {
     m_text = view->view()->doc()->text(range);
 
     connect(m_timeLine, &QTimeLine::valueChanged, this, &KateTextAnimation::nextFrame);
     connect(m_timeLine, &QTimeLine::finished, this, &KateTextAnimation::deleteLater);
 
     m_timeLine->setEasingCurve(QEasingCurve::SineCurve);
     m_timeLine->start();
 
     QObject::connect(view, &KTextEditor::View::destroyed, m_timeLine, &QTimeLine::stop);
 }
 
 KateTextAnimation::~KateTextAnimation()
 {
     // if still running, we need to update the view a last time to avoid artifacts
     if (m_timeLine->state() == QTimeLine::Running) {
         m_timeLine->stop();
         nextFrame(0.0);
     }
 }
 
 QRectF KateTextAnimation::rectForText()
 {
     const QFontMetricsF fm = m_view->view()->renderer()->currentFontMetrics();
     const int lineHeight = m_view->view()->renderer()->lineHeight();
     QPoint pixelPos = m_view->cursorToCoordinate(m_range.start(), /*bool realCursor*/ true, /*bool includeBorder*/ false);
 
     if (pixelPos.x() == -1 || pixelPos.y() == -1) {
         return QRectF();
     } else {
         QRectF rect(pixelPos.x(), pixelPos.y(), fm.boundingRect(m_view->view()->doc()->text(m_range)).width(), lineHeight);
         const QPointF center = rect.center();
         const qreal factor = 1.0 + 0.5 * m_value;
         rect.setWidth(rect.width() * factor);
         rect.setHeight(rect.height() * factor);
         rect.moveCenter(center);
         return rect;
     }
 }
 
 void KateTextAnimation::draw(QPainter &painter)
 {
     // could happen in corner cases: timeLine emitted finished(), but this object
     // is not yet deleted. Therefore, draw() might be called in paintEvent().
     if (m_timeLine->state() == QTimeLine::NotRunning) {
         return;
     }
 
     // get current rect and fill background
     QRectF rect = rectForText();
     painter.fillRect(rect, m_attribute->background());
 
     // scale font with animation
     QFont f = m_view->view()->renderer()->currentFont();
     f.setBold(m_attribute->fontBold());
     f.setPointSizeF(f.pointSizeF() * (1.0 + 0.5 * m_value));
     painter.setFont(f);
 
     painter.setPen(m_attribute->foreground().color());
     // finally draw contents on the view
     painter.drawText(rect, m_text);
 }
 
 void KateTextAnimation::nextFrame(qreal value)
 {
     // cache previous rect for update
     const QRectF prevRect = rectForText();
 
     m_value = value;
 
     // next rect is used to draw the text
     const QRectF nextRect = rectForText();
 
     // due to rounding errors, increase the rect 1px to avoid artifacts
     const QRect updateRect = nextRect.united(prevRect).adjusted(-1, -1, 1, 1).toRect();
 
     // request repaint
     m_view->update(updateRect);
 }
 
 #include "moc_katetextanimation.cpp"