--- /dev/null
+/***************************************************************************
+ * Copyright (C) 2008 by Peter Penz <peter.penz@gmx.at> *
+ * *
+ * 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 <QCoreApplication>
+#include <QCursor>
+#include <QEvent>
+#include <QMouseEvent>
+#include <QScrollBar>
+#include <QTimer>
+
+DolphinViewAutoScroller::DolphinViewAutoScroller(QAbstractItemView* parent) :
+ QObject(parent),
+ m_rubberBandSelection(false),
+ m_scrollInc(0),
+ m_itemView(parent),
+ m_timer()
+{
+ m_itemView->setAutoScroll(false);
+ m_itemView->viewport()->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::eventFilter(QObject* watched, QEvent* event)
+{
+ if (watched == m_itemView->viewport()) {
+ switch (event->type()) {
+ case QEvent::MouseButtonPress:
+ 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:
+ triggerAutoScroll();
+ break;
+
+ case QEvent::DragLeave:
+ stopAutoScroll();
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ return QObject::eventFilter(watched, event);
+}
+
+void DolphinViewAutoScroller::scrollViewport()
+{
+ // TODO: implement horizontal scrolling
+ QScrollBar* verticalScrollBar = m_itemView->verticalScrollBar();
+ if (verticalScrollBar != 0) {
+ const int value = verticalScrollBar->value();
+ verticalScrollBar->setValue(value + m_scrollInc);
+
+ 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, Qt::NoModifier);
+ QCoreApplication::sendEvent(viewport, &event);
+ }
+ }
+}
+
+void DolphinViewAutoScroller::triggerAutoScroll()
+{
+ // TODO: implement horizontal scrolling
+
+ const int startSpeed = 2;
+ const int speedLimiter = 8;
+ const int scrollIncMax = 32;
+
+ const int autoScrollBorder = 32;
+
+ QWidget* viewport = m_itemView->viewport();
+ const QPoint pos = viewport->mapFromGlobal(QCursor::pos());
+ if (pos.y() < autoScrollBorder) {
+ // scroll up
+ m_scrollInc = -startSpeed + (pos.y() - autoScrollBorder) / speedLimiter;
+ if (m_scrollInc < -scrollIncMax) {
+ m_scrollInc = -scrollIncMax;
+ }
+ } else if (pos.y() > viewport->height() - autoScrollBorder) {
+ // scroll down
+ m_scrollInc = startSpeed + (pos.y() - viewport->height() + autoScrollBorder) / speedLimiter;
+ if (m_scrollInc > scrollIncMax) {
+ m_scrollInc = scrollIncMax;
+ }
+ } else {
+ // no scrolling
+ m_scrollInc = 0;
+ }
+
+ if (m_timer->isActive()) {
+ if (m_scrollInc == 0) {
+ m_timer->stop();
+ }
+ } else if (m_scrollInc != 0) {
+ m_timer->start();
+ }
+}
+
+void DolphinViewAutoScroller::stopAutoScroll()
+{
+ m_timer->stop();
+ m_scrollInc = 0;
+}
+
+#include "dolphinviewautoscroller.moc"
--- /dev/null
+/***************************************************************************
+ * Copyright (C) 2008 by Peter Penz <peter.penz@gmx.at> *
+ * *
+ * 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 *
+ ***************************************************************************/
+
+#ifndef DOLPHINVIEWAUTOSCROLLER_H
+#define DOLPHINVIEWAUTOSCROLLER_H
+
+#include <QObject>
+
+class QAbstractItemView;
+class QTimer;
+
+/**
+ * @brief Assures that an autoscrolling is done for item views.
+ *
+ * This is a workaround as QAbstractItemView::setAutoScroll() is not usable
+ * when selecting items (see Qt issue #214542).
+ */
+class DolphinViewAutoScroller : public QObject
+{
+ Q_OBJECT
+
+public:
+ DolphinViewAutoScroller(QAbstractItemView* parent);
+ virtual ~DolphinViewAutoScroller();
+
+protected:
+ virtual bool eventFilter(QObject* watched, QEvent* event);
+
+private slots:
+ void scrollViewport();
+
+private:
+ void triggerAutoScroll();
+ void stopAutoScroll();
+
+private:
+ bool m_rubberBandSelection;
+ int m_scrollInc;
+ QAbstractItemView* m_itemView;
+ QTimer* m_timer;
+};
+
+#endif
projects / dolphin.git / commitdiff