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 /* ============================================================
 * Falkon - Qt web browser
 * Copyright (C) 2016-2017 David Rosca <nowrep@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * ============================================================ */
 
 #include "webscrollbar.h"
 #include "webview.h"
 #include "webpage.h"
 
 #include <QPaintEvent>
 #include <QPainter>
 
 WebScrollBar::WebScrollBar(Qt::Orientation orientation, WebView *view)
     : QScrollBar(orientation)
     , m_view(view)
 {
     setFocusProxy(m_view);
     resize(sizeHint());
 
     connect(this, &QScrollBar::valueChanged, this, &WebScrollBar::performScroll);
     connect(view, &WebView::focusChanged, this, [this]() { update(); });
 }
 
 int WebScrollBar::thickness() const
 {
     return orientation() == Qt::Vertical ? width() : height();
 }
 
 void WebScrollBar::updateValues(const QSize &viewport)
 {
     setMinimum(0);
     setParent(m_view->overlayWidget());
 
     int newValue;
 
     m_blockScrolling = true;
 
     if (orientation() == Qt::Vertical) {
         setFixedHeight(m_view->height() - (m_view->height() - viewport.height()) * devicePixelRatioF());
         move(m_view->width() - width(), 0);
         setPageStep(viewport.height());
         setMaximum(qMax(0, m_view->page()->contentsSize().toSize().height() - viewport.height()));
         newValue = m_view->page()->scrollPosition().toPoint().y();
     } else {
         setFixedWidth(m_view->width() - (m_view->width() - viewport.width()) * devicePixelRatioF());
         move(0, m_view->height() - height());
         setPageStep(viewport.width());
         setMaximum(qMax(0, m_view->page()->contentsSize().toSize().width() - viewport.width()));
         newValue = m_view->page()->scrollPosition().toPoint().x();
     }
 
     if (!isSliderDown()) {
         setValue(newValue);
     }
 
     m_blockScrolling = false;
 }
 
 void WebScrollBar::performScroll()
 {
     if (m_blockScrolling) {
         return;
     }
 
     QPointF pos = m_view->page()->scrollPosition();
 
     if (orientation() == Qt::Vertical) {
         pos.setY(value());
     } else {
         pos.setX(value());
     }
 
     m_view->page()->setScrollPosition(pos);
 }
 
 void WebScrollBar::paintEvent(QPaintEvent *ev)
 {
     QPainter painter(this);
     painter.fillRect(ev->rect(), palette().window());
     QScrollBar::paintEvent(ev);
 }