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Diffstat (limited to 'src/views/dolphinviewautoscroller.cpp')
| -rw-r--r-- | src/views/dolphinviewautoscroller.cpp | 223 |
1 files changed, 0 insertions, 223 deletions
diff --git a/src/views/dolphinviewautoscroller.cpp b/src/views/dolphinviewautoscroller.cpp deleted file mode 100644 index 5b338cc37..000000000 --- a/src/views/dolphinviewautoscroller.cpp +++ /dev/null @@ -1,223 +0,0 @@ -/*************************************************************************** - * Copyright (C) 2008 by Peter Penz <[email protected]> * - * * - * 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 2 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, write to the * - * Free Software Foundation, Inc., * - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * - ***************************************************************************/ - -#include "dolphinviewautoscroller.h" - -#include <QAbstractItemView> -#include <QApplication> -#include <QCursor> -#include <QEvent> -#include <QMouseEvent> -#include <QScrollBar> -#include <QTimer> -#include <math.h> - -DolphinViewAutoScroller::DolphinViewAutoScroller(QAbstractItemView* parent) : - QObject(parent), - m_rubberBandSelection(false), - m_keyPressed(false), - m_initializedTimestamp(false), - m_horizontalScrollInc(0), - m_verticalScrollInc(0), - m_itemView(parent), - m_timer(0), - m_timestamp() -{ - m_itemView->setAutoScroll(false); - m_itemView->viewport()->installEventFilter(this); - m_itemView->installEventFilter(this); - - m_timer = new QTimer(this); - m_timer->setSingleShot(false); - m_timer->setInterval(1000 / 25); // 25 frames per second - connect(m_timer, SIGNAL(timeout()), this, SLOT(scrollViewport())); -} - -DolphinViewAutoScroller::~DolphinViewAutoScroller() -{ -} - -bool DolphinViewAutoScroller::isActive() const -{ - return m_timer->isActive(); -} - -void DolphinViewAutoScroller::handleCurrentIndexChange(const QModelIndex& current, - const QModelIndex& previous) -{ - // When the autoscroller is inactive and a key has been pressed, it must be - // assured that the current item stays visible. The check whether the previous - // item is valid is important because of #197951. The keypress check is done - // because of #199833. - if (current.isValid() && (previous.isValid() || m_keyPressed) && !isActive()) { - m_itemView->scrollTo(current); - } -} - -bool DolphinViewAutoScroller::eventFilter(QObject* watched, QEvent* event) -{ - if (watched == m_itemView->viewport()) { - switch (event->type()) { - case QEvent::MouseButtonPress: - if (static_cast<QMouseEvent*>(event)->button() == Qt::LeftButton) { - m_rubberBandSelection = true; - } - break; - - case QEvent::MouseMove: - if (m_rubberBandSelection) { - triggerAutoScroll(); - } - break; - - case QEvent::MouseButtonRelease: - m_rubberBandSelection = false; - stopAutoScroll(); - break; - - case QEvent::DragEnter: - case QEvent::DragMove: - m_rubberBandSelection = false; - triggerAutoScroll(); - break; - - case QEvent::Drop: - case QEvent::DragLeave: - m_rubberBandSelection = false; - stopAutoScroll(); - break; - - default: - break; - } - } else if (watched == m_itemView) { - switch (event->type()) { - case QEvent::KeyPress: - m_keyPressed = true; - break; - - case QEvent::KeyRelease: - m_keyPressed = false; - break; - - default: - break; - } - } - - return QObject::eventFilter(watched, event); -} - -void DolphinViewAutoScroller::scrollViewport() -{ - if (m_timestamp.elapsed() < QApplication::startDragTime()) { - return; - } - - QScrollBar* verticalScrollBar = m_itemView->verticalScrollBar(); - if (verticalScrollBar) { - const int value = verticalScrollBar->value(); - verticalScrollBar->setValue(value + m_verticalScrollInc); - - } - QScrollBar* horizontalScrollBar = m_itemView->horizontalScrollBar(); - if (horizontalScrollBar) { - const int value = horizontalScrollBar->value(); - horizontalScrollBar->setValue(value + m_horizontalScrollInc); - - } - - if (m_rubberBandSelection) { - // The scrolling does not lead to an update of the rubberband - // selection. Fake a mouse move event to let the QAbstractItemView - // update the rubberband. - QWidget* viewport = m_itemView->viewport(); - const QPoint pos = viewport->mapFromGlobal(QCursor::pos()); - QMouseEvent event(QEvent::MouseMove, pos, Qt::LeftButton, Qt::LeftButton, QApplication::keyboardModifiers()); - QCoreApplication::sendEvent(viewport, &event); - } -} - -void DolphinViewAutoScroller::triggerAutoScroll() -{ - const bool verticalScrolling = m_itemView->verticalScrollBar() && - m_itemView->verticalScrollBar()->isVisible(); - const bool horizontalScrolling = m_itemView->horizontalScrollBar() && - m_itemView->horizontalScrollBar()->isVisible(); - if (!verticalScrolling && !horizontalScrolling) { - // no scrollbars are shown at all, so no autoscrolling is necessary - stopAutoScroll(); - return; - } - - QWidget* viewport = m_itemView->viewport(); - const QPoint pos = viewport->mapFromGlobal(QCursor::pos()); - if (verticalScrolling) { - m_verticalScrollInc = calculateScrollIncrement(pos.y(), viewport->height()); - } - if (horizontalScrolling) { - m_horizontalScrollInc = calculateScrollIncrement(pos.x(), viewport->width()); - } - - if (m_timer->isActive()) { - if ((m_horizontalScrollInc == 0) && (m_verticalScrollInc == 0)) { - stopAutoScroll(); - } - } else if ((m_horizontalScrollInc != 0) || (m_verticalScrollInc != 0)) { - if (!m_initializedTimestamp) { - m_initializedTimestamp = true; - m_timestamp.start(); - } - m_timer->start(); - } -} - -void DolphinViewAutoScroller::stopAutoScroll() -{ - m_timer->stop(); - m_horizontalScrollInc = 0; - m_verticalScrollInc = 0; - m_initializedTimestamp = false; -} - -int DolphinViewAutoScroller::calculateScrollIncrement(int cursorPos, int rangeSize) const -{ - int inc = 0; - - const int minSpeed = 4; - const int maxSpeed = 768; - const int speedLimiter = 48; - const int autoScrollBorder = 64; - - if (cursorPos < autoScrollBorder) { - inc = -minSpeed + qAbs(cursorPos - autoScrollBorder) * (cursorPos - autoScrollBorder) / speedLimiter; - if (inc < -maxSpeed) { - inc = -maxSpeed; - } - } else if (cursorPos > rangeSize - autoScrollBorder) { - inc = minSpeed + qAbs(cursorPos - rangeSize + autoScrollBorder) * (cursorPos - rangeSize + autoScrollBorder) / speedLimiter; - if (inc > maxSpeed) { - inc = maxSpeed; - } - } - - return inc; -} - -#include "dolphinviewautoscroller.moc" |