* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
+#include <QCursor>
#include <QGraphicsScene>
+#include <QGraphicsSceneHoverEvent>
#include <QPainter>
#include "columnhandleitem.h"
-ColumnHandleItem::ColumnHandleItem(qreal w, QGraphicsItem *parent) : QGraphicsItem(parent) {
- _width = w;
+ColumnHandleItem::ColumnHandleItem(qreal w, QGraphicsItem *parent)
+ : QGraphicsItem(parent),
+ _width(w),
+ _hover(0),
+ _moving(false),
+ _minXPos(0),
+ _maxXPos(0),
+ _timeLine(150)
+{
+ setAcceptsHoverEvents(true);
+ setZValue(10);
+ setCursor(QCursor(Qt::OpenHandCursor));
+ connect(&_timeLine, SIGNAL(valueChanged(qreal)), this, SLOT(hoverChanged(qreal)));
}
void ColumnHandleItem::setXPos(qreal xpos) {
- setPos(xpos - width()/2, (qreal)0);
+ setPos(xpos - width()/2, 0);
+}
+
+void ColumnHandleItem::setXLimits(qreal min, qreal max) {
+ _minXPos = min;
+ _maxXPos = max;
+ //if(x() < min) setPos(min, 0);
+ //else if(x() > max) setPos(max - width(), 0);
}
void ColumnHandleItem::sceneRectChanged(const QRectF &rect) {
prepareGeometryChange();
}
+void ColumnHandleItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event) {
+ if(event->buttons() & Qt::LeftButton && _moving) {
+ if(contains(event->lastPos())) {
+ qreal newx = x() + (event->scenePos() - event->lastScenePos()).x();
+ if(newx < _minXPos) newx = _minXPos;
+ else if(newx + width() > _maxXPos) newx = _maxXPos - width();
+ setPos(newx, 0);
+ }
+ event->accept();
+ } else {
+ event->ignore();
+ }
+}
+
+void ColumnHandleItem::mousePressEvent(QGraphicsSceneMouseEvent *event) {
+ if(event->buttons() & Qt::LeftButton) {
+ setCursor(QCursor(Qt::ClosedHandCursor));
+ _moving = true;
+ event->accept();
+ } else {
+ event->ignore();
+ }
+}
+
+void ColumnHandleItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) {
+ if(_moving) {
+ _moving = false;
+ setCursor(QCursor(Qt::OpenHandCursor));
+ emit positionChanged(x() + width()/2);
+ event->accept();
+ } else {
+ event->ignore();
+ }
+}
+
+void ColumnHandleItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event) {
+ Q_UNUSED(event);
+
+ _timeLine.setDirection(QTimeLine::Forward);
+ if(_timeLine.state() != QTimeLine::Running)
+ _timeLine.start();
+}
+
+void ColumnHandleItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event) {
+ Q_UNUSED(event);
+
+ _timeLine.setDirection(QTimeLine::Backward);
+ if(_timeLine.state() != QTimeLine::Running)
+ _timeLine.start();
+}
+
+void ColumnHandleItem::hoverChanged(qreal value) {
+ _hover = value;
+ update();
+}
+
void ColumnHandleItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) {
Q_UNUSED(option);
Q_UNUSED(widget);
- painter->drawRect(boundingRect());
-
-
+ QLinearGradient gradient(0, 0, width(), 0);
+ gradient.setColorAt(0.25, Qt::transparent);
+ gradient.setColorAt(0.5, QColor(0, 0, 0, _hover * 200));
+ gradient.setColorAt(0.75, Qt::transparent);
+ painter->fillRect(boundingRect(), gradient);
}
+