src/qtui/columnhandleitem.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2013 by the Quassel Project                        *
   3  *   devel@quassel-irc.org                                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
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   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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  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     setAcceptsHoverEvents(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 }
  62
  63
  64 void ColumnHandleItem::setXLimits(qreal min, qreal max)
  65 {
  66     _minXPos = min;
  67     _maxXPos = max;
  68     //if(x() < min) setPos(min, 0);
  69     //else if(x() > max) setPos(max - width(), 0);
  70 }
  71
  72
  73 void ColumnHandleItem::sceneRectChanged(const QRectF &rect)
  74 {
  75     prepareGeometryChange();
  76     _boundingRect = QRectF(-_width/2, rect.y(), _width, rect.height());
  77 }
  78
  79
  80 void ColumnHandleItem::setOpacity(qreal opacity)
  81 {
  82     _opacity = opacity;
  83     update();
  84 }
  85
  86
  87 void ColumnHandleItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
  88 {
  89     if (event->buttons() & Qt::LeftButton && _moving) {
  90         qreal newx = event->scenePos().x() - _offset;
  91         if (newx < _minXPos)
  92             newx = _minXPos;
  93         else if (newx + width() > _maxXPos)
  94             newx = _maxXPos - width();
  95         setPos(newx, 0);
  96         event->accept();
  97     }
  98     else {
  99         event->ignore();
 100     }
 101 }
 102
 103
 104 void ColumnHandleItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
 105 {
 106     if (event->buttons() & Qt::LeftButton) {
 107         QApplication::setOverrideCursor(Qt::ClosedHandCursor);
 108         _moving = true;
 109         _offset = event->pos().x();
 110         event->accept();
 111     }
 112     else {
 113         event->ignore();
 114     }
 115 }
 116
 117
 118 void ColumnHandleItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
 119 {
 120     if (_moving) {
 121         _moving = false;
 122         QRectF sceneBRect = _boundingRect.translated(x(), 0);
 123         _sceneLeft = sceneBRect.left();
 124         _sceneRight = sceneBRect.right();
 125         emit positionChanged(x());
 126         QApplication::restoreOverrideCursor();
 127         event->accept();
 128     }
 129     else {
 130         event->ignore();
 131     }
 132 }
 133
 134
 135 void ColumnHandleItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
 136 {
 137     Q_UNUSED(event);
 138
 139     _animation->setDirection(QPropertyAnimation::Forward);
 140     _animation->start();
 141 }
 142
 143
 144 void ColumnHandleItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
 145 {
 146     Q_UNUSED(event);
 147
 148     _animation->setDirection(QPropertyAnimation::Backward);
 149     _animation->start();
 150 }
 151
 152
 153 void ColumnHandleItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 154 {
 155     Q_UNUSED(option);
 156     Q_UNUSED(widget);
 157
 158     QLinearGradient gradient(boundingRect().topLeft(), boundingRect().topRight());
 159     QColor color = QApplication::palette().windowText().color();
 160     color.setAlphaF(_opacity);
 161     gradient.setColorAt(0, Qt::transparent);
 162     gradient.setColorAt(0.45, color);
 163     gradient.setColorAt(0.55, color);
 164     gradient.setColorAt(1, Qt::transparent);
 165     painter->fillRect(boundingRect(), gradient);
 166 }