src/qtui/columnhandleitem.cpp

   1 /***************************************************************************
   2 *   Copyright (C) 2005-08 by the Quassel IRC Team                         *
   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,       *
  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.                          *
  14 *                                                                         *
  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 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19 ***************************************************************************/
  20
  21 #include <QCursor>
  22 #include <QGraphicsScene>
  23 #include <QGraphicsSceneHoverEvent>
  24 #include <QPainter>
  25
  26 #include <QDebug>
  27
  28 #include "columnhandleitem.h"
  29
  30 ColumnHandleItem::ColumnHandleItem(qreal w, QGraphicsItem *parent)
  31   : QGraphicsItem(parent),
  32     _width(w),
  33     _hover(0),
  34     _timeLine(150)
  35 {
  36   setAcceptsHoverEvents(true);
  37   setZValue(10);
  38   setCursor(QCursor(Qt::OpenHandCursor));
  39   setFlag(ItemIsMovable);
  40
  41   connect(&_timeLine, SIGNAL(valueChanged(qreal)), this, SLOT(hoverChanged(qreal)));
  42 }
  43
  44 void ColumnHandleItem::setXPos(qreal xpos) {
  45   setPos(xpos - width()/2, (qreal)0);
  46 }
  47
  48 void ColumnHandleItem::sceneRectChanged(const QRectF &rect) {
  49   if(rect.height() != boundingRect().height())
  50     prepareGeometryChange();
  51 }
  52
  53 void ColumnHandleItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event) {
  54   QGraphicsItem::mouseMoveEvent(event);
  55 }
  56
  57 void ColumnHandleItem::mousePressEvent(QGraphicsSceneMouseEvent *event) { qDebug() << "pressed!";
  58   setCursor(QCursor(Qt::ClosedHandCursor));
  59   QGraphicsItem::mousePressEvent(event);
  60 }
  61
  62 void ColumnHandleItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) {
  63   setCursor(QCursor(Qt::OpenHandCursor));
  64   QGraphicsItem::mouseReleaseEvent(event);
  65 }
  66
  67 void ColumnHandleItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) {
  68   Q_UNUSED(option);
  69   Q_UNUSED(widget);
  70
  71   QLinearGradient gradient(0, 0, width(), 0);
  72   gradient.setColorAt(0.25, Qt::transparent);
  73   gradient.setColorAt(0.5, QColor(0, 0, 0, _hover * 200));
  74   gradient.setColorAt(0.75, Qt::transparent);
  75   painter->fillRect(boundingRect(), gradient);
  76 }
  77
  78 void ColumnHandleItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event) {
  79   Q_UNUSED(event);
  80
  81   _timeLine.setDirection(QTimeLine::Forward);
  82   if(_timeLine.state() != QTimeLine::Running)
  83     _timeLine.start();
  84 }
  85
  86 void ColumnHandleItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event) {
  87   Q_UNUSED(event);
  88
  89   _timeLine.setDirection(QTimeLine::Backward);
  90   if(_timeLine.state() != QTimeLine::Running)
  91     _timeLine.start();
  92 }
  93
  94 void ColumnHandleItem::hoverChanged(qreal value) {
  95   _hover = value;
  96   update();
  97 }
  98