src/qtui/columnhandleitem.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2018 by the Quassel Project                        *
   3  *   devel@quassel-irc.org                                                 *
   4  *                                                                         *
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   8  *   (at your option) version 3.                                           *
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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     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
  52
  53 void ColumnHandleItem::setXPos(qreal xpos)
  54 {
  55     setPos(xpos, 0);
  56     QRectF sceneBRect = _boundingRect.translated(x(), 0);
  57     _sceneLeft = sceneBRect.left();
  58     _sceneRight = sceneBRect.right();
  59     emit positionChanged(xpos);
  60 }
  61
  62
  63 void ColumnHandleItem::setXLimits(qreal min, qreal max)
  64 {
  65     _minXPos = min;
  66     _maxXPos = max;
  67     //if(x() < min) setPos(min, 0);
  68     //else if(x() > max) setPos(max - width(), 0);
  69 }
  70
  71
  72 void ColumnHandleItem::sceneRectChanged(const QRectF &rect)
  73 {
  74     prepareGeometryChange();
  75     _boundingRect = QRectF(-_width/2, rect.y(), _width, rect.height());
  76 }
  77
  78
  79 void ColumnHandleItem::setOpacity(qreal opacity)
  80 {
  81     _opacity = opacity;
  82     update();
  83 }
  84
  85
  86 void ColumnHandleItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
  87 {
  88     if (event->buttons() & Qt::LeftButton && _moving) {
  89         qreal newx = event->scenePos().x() - _offset;
  90         if (newx < _minXPos)
  91             newx = _minXPos;
  92         else if (newx + width() > _maxXPos)
  93             newx = _maxXPos - width();
  94         setPos(newx, 0);
  95         event->accept();
  96     }
  97     else {
  98         event->ignore();
  99     }
 100 }
 101
 102
 103 void ColumnHandleItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
 104 {
 105     if (event->buttons() & Qt::LeftButton) {
 106         QApplication::setOverrideCursor(Qt::ClosedHandCursor);
 107         _moving = true;
 108         _offset = event->pos().x();
 109         event->accept();
 110     }
 111     else {
 112         event->ignore();
 113     }
 114 }
 115
 116
 117 void ColumnHandleItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
 118 {
 119     if (_moving) {
 120         _moving = false;
 121         QRectF sceneBRect = _boundingRect.translated(x(), 0);
 122         _sceneLeft = sceneBRect.left();
 123         _sceneRight = sceneBRect.right();
 124         emit positionChanged(x());
 125         QApplication::restoreOverrideCursor();
 126         event->accept();
 127     }
 128     else {
 129         event->ignore();
 130     }
 131 }
 132
 133
 134 void ColumnHandleItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
 135 {
 136     Q_UNUSED(event);
 137
 138     _animation->setDirection(QPropertyAnimation::Forward);
 139     _animation->start();
 140 }
 141
 142
 143 void ColumnHandleItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
 144 {
 145     Q_UNUSED(event);
 146
 147     _animation->setDirection(QPropertyAnimation::Backward);
 148     _animation->start();
 149 }
 150
 151
 152 void ColumnHandleItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 153 {
 154     Q_UNUSED(option);
 155     Q_UNUSED(widget);
 156
 157     QLinearGradient gradient(boundingRect().topLeft(), boundingRect().topRight());
 158     QColor color = QApplication::palette().windowText().color();
 159     color.setAlphaF(_opacity);
 160     gradient.setColorAt(0, Qt::transparent);
 161     gradient.setColorAt(0.45, color);
 162     gradient.setColorAt(0.55, color);
 163     gradient.setColorAt(1, Qt::transparent);
 164     painter->fillRect(boundingRect(), gradient);
 165 }