// setOptimizationFlags(QGraphicsView::DontAdjustForAntialiasing);
setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
// setTransformationAnchor(QGraphicsView::NoAnchor);
- setTransformationAnchor(QGraphicsView::AnchorViewCenter);
+ setTransformationAnchor(QGraphicsView::AnchorViewCenter);
+
+ _scrollTimer.setInterval(100);
+ _scrollTimer.setSingleShot(true);
+ connect(&_scrollTimer, SIGNAL(timeout()), SLOT(scrollTimerTimeout()));
_scene = new ChatScene(filter, filter->idString(), viewport()->width() - 2, this); // see below: resizeEvent()
connect(_scene, SIGNAL(sceneRectChanged(const QRectF &)), this, SLOT(sceneRectChanged(const QRectF &)));
connect(_scene, SIGNAL(lastLineChanged(QGraphicsItem *, qreal)), this, SLOT(lastLineChanged(QGraphicsItem *, qreal)));
+ connect(_scene, SIGNAL(mouseMoveWhileSelecting(const QPointF &)), this, SLOT(mouseMoveWhileSelecting(const QPointF &)));
setScene(_scene);
// installEventFilter(_scene);
verticalScrollBar()->setValue(verticalScrollBar()->maximum());
}
+void ChatView::mouseMoveWhileSelecting(const QPointF &scenePos) {
+ int y = (int)mapFromScene(scenePos).y();
+ _scrollOffset = 0;
+ if(y < 0)
+ _scrollOffset = y;
+ else if(y > height())
+ _scrollOffset = y - height();
+
+ if(_scrollOffset && !_scrollTimer.isActive())
+ _scrollTimer.start();
+}
+
+void ChatView::scrollTimerTimeout() {
+ // scroll view
+ QAbstractSlider *vbar = verticalScrollBar();
+ if(_scrollOffset < 0 && vbar->value() > 0)
+ vbar->setValue(qMax(vbar->value() + _scrollOffset, 0));
+ else if(_scrollOffset > 0 && vbar->value() < vbar->maximum())
+ vbar->setValue(qMin(vbar->value() + _scrollOffset, vbar->maximum()));
+}
+
void ChatView::lastLineChanged(QGraphicsItem *chatLine, qreal offset) {
Q_UNUSED(chatLine)
QAbstractSlider *vbar = verticalScrollBar();
return model->data(model->index(model->rowCount() - 1, 0), MessageModel::MsgIdRole).value<MsgId>();
}
-void ChatView::zoomIn() {
+void ChatView::zoomIn() {
_currentScaleFactor *= 1.2;
scale(1.2, 1.2);
scene()->setWidth(viewport()->width() / _currentScaleFactor - 2);
#define CHATVIEW_H_
#include <QGraphicsView>
+#include <QTimer>
#include "abstractbuffercontainer.h"
virtual void resizeEvent(QResizeEvent *event);
protected slots:
- void lastLineChanged(QGraphicsItem *chatLine, qreal offset);
virtual inline void sceneRectChanged(const QRectF &rect) { setSceneRect(rect); }
virtual void verticalScrollbarChanged(int);
+private slots:
+ void lastLineChanged(QGraphicsItem *chatLine, qreal offset);
+ void mouseMoveWhileSelecting(const QPointF &scenePos);
+ void scrollTimerTimeout();
+
private:
void init(MessageFilter *filter);
ChatScene *_scene;
int _lastScrollbarPos;
qreal _currentScaleFactor;
+ QTimer _scrollTimer;
+ int _scrollOffset;
};