1 /***************************************************************************
2 * Copyright (C) 2005-2019 by the Quassel Project *
3 * devel@quassel-irc.org *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) version 3. *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
19 ***************************************************************************/
21 #include "treeviewtouch.h"
25 #include <QTouchEvent>
27 TreeViewTouch::TreeViewTouch(QWidget* parent)
30 setAttribute(Qt::WA_AcceptTouchEvents);
33 bool TreeViewTouch::event(QEvent* event)
35 if (event->type() == QEvent::TouchBegin && ((QTouchEvent*)event)->device()->type() == QTouchDevice::TouchScreen) {
36 // Register that we may be scrolling, set the scroll mode to scroll-per-pixel
37 // and accept the event (return true) so that we will receive TouchUpdate and TouchEnd/TouchCancel
38 _touchScrollInProgress = true;
39 setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
43 if (event->type() == QEvent::TouchUpdate && _touchScrollInProgress) {
44 QTouchEvent::TouchPoint p = ((QTouchEvent*)event)->touchPoints().at(0);
45 if (!_firstTouchUpdateHappened) {
46 // After the first movement of a Touch-Point, calculate the distance in both axis
47 // and if the point moved more horizontally abort scroll.
48 double dx = qAbs(p.lastPos().x() - p.pos().x());
49 double dy = qAbs(p.lastPos().y() - p.pos().y());
51 _touchScrollInProgress = false;
53 _firstTouchUpdateHappened = true;
55 // Apply touch movement to scrollbar
56 verticalScrollBar()->setValue(verticalScrollBar()->value() - (p.pos().y() - p.lastPos().y()));
60 if (event->type() == QEvent::TouchEnd || event->type() == QEvent::TouchCancel) {
61 // End scroll and reset variables
62 _touchScrollInProgress = false;
63 _firstTouchUpdateHappened = false;
67 return QTreeView::event(event);
70 void TreeViewTouch::mousePressEvent(QMouseEvent* event)
72 if (!_touchScrollInProgress)
73 QTreeView::mousePressEvent(event);
76 void TreeViewTouch::mouseMoveEvent(QMouseEvent* event)
78 if (!_touchScrollInProgress)
79 QTreeView::mouseMoveEvent(event);