src/qtui/columnhandleitem.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,       *
  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  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
  19  ***************************************************************************/
  20
  21 #include "chatview.h"
  22 #include "columnhandleitem.h"
  23
  24 #include <QApplication>
  25 #include <QCursor>
  26 #include <QGraphicsSceneHoverEvent>
  27 #include <QPainter>
  28 #include <QPalette>
  29
  30 ColumnHandleItem::ColumnHandleItem(qreal w, QGraphicsItem *parent)
  31     : QGraphicsObject(parent),
  32     _width(w),
  33     _boundingRect(-_width/2, 0, _width, 0),
  34     _moving(false),
  35     _offset(0),
  36     _minXPos(0),
  37     _maxXPos(0),
  38     _opacity(0),
  39     _animation(new QPropertyAnimation(this, "opacity", this))
  40 {
  41     setAcceptHoverEvents(true);
  42     setZValue(10);
  43     setCursor(QCursor(Qt::OpenHandCursor));
  44
  45     _animation->setStartValue(0);
  46     _animation->setEndValue(1);
  47     _animation->setDirection(QPropertyAnimation::Forward);
  48     _animation->setDuration(350);
  49     _animation->setEasingCurve(QEasingCurve::InOutSine);
  50
  51     //connect(&_timeLine, SIGNAL(valueChanged(qreal)), this, SLOT(hoverChanged(qreal)));
  52 }
  53
  54
  55 void ColumnHandleItem::setXPos(qreal xpos)
  56 {
  57     setPos(xpos, 0);
  58     QRectF sceneBRect = _boundingRect.translated(x(), 0);
  59     _sceneLeft = sceneBRect.left();
  60     _sceneRight = sceneBRect.right();
  61     emit positionChanged(xpos);
  62 }
  63
  64
  65 void ColumnHandleItem::setXLimits(qreal min, qreal max)
  66 {
  67     _minXPos = min;
  68     _maxXPos = max;
  69     //if(x() < min) setPos(min, 0);
  70     //else if(x() > max) setPos(max - width(), 0);
  71 }
  72
  73
  74 void ColumnHandleItem::sceneRectChanged(const QRectF &rect)
  75 {
  76     prepareGeometryChange();
  77     _boundingRect = QRectF(-_width/2, rect.y(), _width, rect.height());
  78 }
  79
  80
  81 void ColumnHandleItem::setOpacity(qreal opacity)
  82 {
  83     _opacity = opacity;
  84     update();
  85 }
  86
  87
  88 void ColumnHandleItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
  89 {
  90     if (event->buttons() & Qt::LeftButton && _moving) {
  91         qreal newx = event->scenePos().x() - _offset;
  92         if (newx < _minXPos)
  93             newx = _minXPos;
  94         else if (newx + width() > _maxXPos)
  95             newx = _maxXPos - width();
  96         setPos(newx, 0);
  97         event->accept();
  98     }
  99     else {
 100         event->ignore();
 101     }
 102 }
 103
 104
 105 void ColumnHandleItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
 106 {
 107     if (event->buttons() & Qt::LeftButton) {
 108         QApplication::setOverrideCursor(Qt::ClosedHandCursor);
 109         _moving = true;
 110         _offset = event->pos().x();
 111         event->accept();
 112     }
 113     else {
 114         event->ignore();
 115     }
 116 }
 117
 118
 119 void ColumnHandleItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
 120 {
 121     if (_moving) {
 122         _moving = false;
 123         QRectF sceneBRect = _boundingRect.translated(x(), 0);
 124         _sceneLeft = sceneBRect.left();
 125         _sceneRight = sceneBRect.right();
 126         emit positionChanged(x());
 127         QApplication::restoreOverrideCursor();
 128         event->accept();
 129     }
 130     else {
 131         event->ignore();
 132     }
 133 }
 134
 135
 136 void ColumnHandleItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
 137 {
 138     Q_UNUSED(event);
 139
 140     _animation->setDirection(QPropertyAnimation::Forward);
 141     _animation->start();
 142 }
 143
 144
 145 void ColumnHandleItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
 146 {
 147     Q_UNUSED(event);
 148
 149     _animation->setDirection(QPropertyAnimation::Backward);
 150     _animation->start();
 151 }
 152
 153
 154 void ColumnHandleItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 155 {
 156     Q_UNUSED(option);
 157     Q_UNUSED(widget);
 158
 159     QLinearGradient gradient(boundingRect().topLeft(), boundingRect().topRight());
 160     QColor color = QApplication::palette().windowText().color();
 161     color.setAlphaF(_opacity);
 162     gradient.setColorAt(0, Qt::transparent);
 163     gradient.setColorAt(0.45, color);
 164     gradient.setColorAt(0.55, color);
 165     gradient.setColorAt(1, Qt::transparent);
 166     painter->fillRect(boundingRect(), gradient);
 167 }