src/uisupport/treeviewtouch.cpp

   1 /***************************************************************************
   2 *   Copyright (C) 2005-2015 by the Quassel Project                        *
   3 *   devel@quassel-irc.org                                                 *
   4 *                                                                         *
   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.                                           *
   9 *                                                                         *
  10 *   This program is distributed in the hope that it will be useful,       *
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  12 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13 *   GNU General Public License for more details.                          *
  14 *                                                                         *
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  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 ***************************************************************************/
  20 #include "treeviewtouch.h"
  21
  22 #include <QtCore>
  23 #include <QTouchEvent>
  24 #include <QScrollBar>
  25
  26 TreeViewTouch::TreeViewTouch(QWidget *parent)
  27         : QTreeView(parent)
  28 {
  29         setAttribute(Qt::WA_AcceptTouchEvents);
  30 }
  31
  32
  33 bool TreeViewTouch::event(QEvent *event) {
  34         if (event->type() == QEvent::TouchBegin) {
  35                 _touchScrollInProgress = true;
  36                 setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
  37                 return true;
  38         }
  39
  40         if (event->type() == QEvent::TouchUpdate && _touchScrollInProgress) {
  41                 QTouchEvent::TouchPoint p = ((QTouchEvent*)event)->touchPoints().at(0);
  42                 if (!_firstTouchUpdateHappened) {
  43                         double dx = abs(p.lastPos().x() - p.pos().x());
  44                         double dy = abs(p.lastPos().y() - p.pos().y());
  45                         if (dx > dy) {
  46                                 _touchScrollInProgress = false;
  47                         }
  48                         _firstTouchUpdateHappened = true;
  49                 }
  50                 verticalScrollBar()->setValue(verticalScrollBar()->value() - (p.pos().y() - p.lastPos().y()));
  51                 return true;
  52         }
  53
  54 #if QT_VERSION >= 0x050000
  55         if (event->type() == QEvent::TouchEnd || event->type() == QEvent::TouchCancel) {
  56 #else
  57     if (event->type() == QEvent::TouchEnd) {
  58 #endif
  59                 _touchScrollInProgress = false;
  60                 _firstTouchUpdateHappened = false;
  61                 return true;
  62         }
  63
  64         return QTreeView::event(event);
  65 }
  66
  67 void TreeViewTouch::mousePressEvent(QMouseEvent * event) {
  68         if (!_touchScrollInProgress)
  69                 QTreeView::mousePressEvent(event);
  70 }
  71
  72 void TreeViewTouch::mouseMoveEvent(QMouseEvent * event) {
  73         if (!_touchScrollInProgress)
  74                 QTreeView::mouseMoveEvent(event);
  75 };