src/qtui/columnhandleitem.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2018 by the Quassel Project                        *
   3  *   devel@quassel-irc.org                                                 *
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  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
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  20
  21 #include "columnhandleitem.h"
  22
  23 #include <QApplication>
  24 #include <QCursor>
  25 #include <QGraphicsSceneHoverEvent>
  26 #include <QPainter>
  27 #include <QPalette>
  28
  29 #include "chatview.h"
  30
  31 ColumnHandleItem::ColumnHandleItem(qreal w, QGraphicsItem* parent)
  32     : QGraphicsObject(parent)
  33     , _width(w)
  34     , _boundingRect(-_width / 2, 0, _width, 0)
  35     , _moving(false)
  36     , _offset(0)
  37     , _minXPos(0)
  38     , _maxXPos(0)
  39     , _opacity(0)
  40     , _animation(new QPropertyAnimation(this, "opacity", this))
  41 {
  42     setAcceptHoverEvents(true);
  43     setZValue(10);
  44     setCursor(QCursor(Qt::OpenHandCursor));
  45
  46     _animation->setStartValue(0);
  47     _animation->setEndValue(1);
  48     _animation->setDirection(QPropertyAnimation::Forward);
  49     _animation->setDuration(350);
  50     _animation->setEasingCurve(QEasingCurve::InOutSine);
  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 void ColumnHandleItem::setXLimits(qreal min, qreal max)
  63 {
  64     _minXPos = min;
  65     _maxXPos = max;
  66     // if(x() < min) setPos(min, 0);
  67     // else if(x() > max) setPos(max - width(), 0);
  68 }
  69
  70 void ColumnHandleItem::sceneRectChanged(const QRectF& rect)
  71 {
  72     prepareGeometryChange();
  73     _boundingRect = QRectF(-_width / 2, rect.y(), _width, rect.height());
  74 }
  75
  76 void ColumnHandleItem::setOpacity(qreal opacity)
  77 {
  78     _opacity = opacity;
  79     update();
  80 }
  81
  82 void ColumnHandleItem::mouseMoveEvent(QGraphicsSceneMouseEvent* event)
  83 {
  84     if (event->buttons() & Qt::LeftButton && _moving) {
  85         qreal newx = event->scenePos().x() - _offset;
  86         if (newx < _minXPos)
  87             newx = _minXPos;
  88         else if (newx + width() > _maxXPos)
  89             newx = _maxXPos - width();
  90         setPos(newx, 0);
  91         event->accept();
  92     }
  93     else {
  94         event->ignore();
  95     }
  96 }
  97
  98 void ColumnHandleItem::mousePressEvent(QGraphicsSceneMouseEvent* event)
  99 {
 100     if (event->buttons() & Qt::LeftButton) {
 101         QApplication::setOverrideCursor(Qt::ClosedHandCursor);
 102         _moving = true;
 103         _offset = event->pos().x();
 104         event->accept();
 105     }
 106     else {
 107         event->ignore();
 108     }
 109 }
 110
 111 void ColumnHandleItem::mouseReleaseEvent(QGraphicsSceneMouseEvent* event)
 112 {
 113     if (_moving) {
 114         _moving = false;
 115         QRectF sceneBRect = _boundingRect.translated(x(), 0);
 116         _sceneLeft = sceneBRect.left();
 117         _sceneRight = sceneBRect.right();
 118         emit positionChanged(x());
 119         QApplication::restoreOverrideCursor();
 120         event->accept();
 121     }
 122     else {
 123         event->ignore();
 124     }
 125 }
 126
 127 void ColumnHandleItem::hoverEnterEvent(QGraphicsSceneHoverEvent* event)
 128 {
 129     Q_UNUSED(event);
 130
 131     _animation->setDirection(QPropertyAnimation::Forward);
 132     _animation->start();
 133 }
 134
 135 void ColumnHandleItem::hoverLeaveEvent(QGraphicsSceneHoverEvent* event)
 136 {
 137     Q_UNUSED(event);
 138
 139     _animation->setDirection(QPropertyAnimation::Backward);
 140     _animation->start();
 141 }
 142
 143 void ColumnHandleItem::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
 144 {
 145     Q_UNUSED(option);
 146     Q_UNUSED(widget);
 147
 148     QLinearGradient gradient(boundingRect().topLeft(), boundingRect().topRight());
 149     QColor color = QApplication::palette().windowText().color();
 150     color.setAlphaF(_opacity);
 151     gradient.setColorAt(0, Qt::transparent);
 152     gradient.setColorAt(0.45, color);
 153     gradient.setColorAt(0.55, color);
 154     gradient.setColorAt(1, Qt::transparent);
 155     painter->fillRect(boundingRect(), gradient);
 156 }