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Refactoring. Smooth scrolling.

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--HG--
branch : develop
This commit is contained in:
Roman Telezhynskyi 2015-12-17 21:13:07 +02:00
parent 6ba9bb8b28
commit 3beb8a8b7c
2 changed files with 67 additions and 60 deletions
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124
src/libs/vwidgets/vmaingraphicsview.cpp
View File

@ -90,29 +90,19 @@ void GraphicsViewZoom::set_zoom_factor_base(double value)
void GraphicsViewZoom::scrollingTime(qreal x)
{
Q_UNUSED(x);
qreal factor = 1.0;
if (_numScheduledScalings < 0)
qreal scroll = _view->verticalScrollBar()->pageStep()/60;
if (_numScheduledScalings > 0)
{
factor = factor*13.8;
scroll = scroll * -1;
}
else
{
factor = factor*-13.8;
}
_view->verticalScrollBar()->setValue(qRound(_view->verticalScrollBar()->value() + factor));
_view->verticalScrollBar()->setValue(qRound(_view->verticalScrollBar()->value() + scroll));
}
//---------------------------------------------------------------------------------------------------------------------
void GraphicsViewZoom::animFinished()
{
if (_numScheduledScalings > 0)
{
_numScheduledScalings--;
}
else
{
_numScheduledScalings++;
}
_numScheduledScalings > 0 ? _numScheduledScalings-- : _numScheduledScalings++;
anim->stop();
/*
@ -133,53 +123,69 @@ void GraphicsViewZoom::animFinished()
//---------------------------------------------------------------------------------------------------------------------
bool GraphicsViewZoom::eventFilter(QObject *object, QEvent *event)
{
if (event->type() == QEvent::MouseMove)
{
/*
* Here we are saving cursor position on view and scene.
* This data need for gentle_zoom().
* Almoust the same we do in method GraphicsViewZoom::animFinished.
*/
QMouseEvent* mouse_event = static_cast<QMouseEvent*>(event);
QPointF delta = target_viewport_pos - mouse_event->pos();
if (qAbs(delta.x()) > 5 || qAbs(delta.y()) > 5)
if (event->type() == QEvent::MouseMove)
{
target_viewport_pos = mouse_event->pos();
target_scene_pos = _view->mapToScene(mouse_event->pos());
}
}
else if (event->type() == QEvent::Wheel)
{
QWheelEvent* wheel_event = static_cast<QWheelEvent*>(event);
if (QApplication::keyboardModifiers() == _modifiers)
{
if (wheel_event->orientation() == Qt::Vertical)
{
double angle = wheel_event->angleDelta().y();
double factor = qPow(_zoom_factor_base, angle);
gentle_zoom(factor);
return true;
}
}
else
{
int numSteps = wheel_event->delta() / 8 / 15; // see QWheelEvent documentation
_numScheduledScalings += numSteps;
if (_numScheduledScalings * numSteps < 0)
{ // if user moved the wheel in another direction, we reset
_numScheduledScalings = numSteps; // previously scheduled scalings
}
if (anim->state() != QTimeLine::Running)
/*
* Here we are saving cursor position on view and scene.
* This data need for gentle_zoom().
* Almoust the same we do in method GraphicsViewZoom::animFinished.
*/
QMouseEvent* mouse_event = static_cast<QMouseEvent*>(event);
QPointF delta = target_viewport_pos - mouse_event->pos();
if (qAbs(delta.x()) > 5 || qAbs(delta.y()) > 5)
{
anim->start();
target_viewport_pos = mouse_event->pos();
target_scene_pos = _view->mapToScene(mouse_event->pos());
}
return true;
return false;
}
}
Q_UNUSED(object)
return false;
else if (event->type() == QEvent::Wheel)
{
QWheelEvent* wheel_event = static_cast<QWheelEvent*>(event);
if (QApplication::keyboardModifiers() == _modifiers)
{
if (wheel_event->orientation() == Qt::Vertical)
{
double angle = wheel_event->angleDelta().y();
double factor = qPow(_zoom_factor_base, angle);
gentle_zoom(factor);
return true;
}
}
else
{
const QPoint numPixels = wheel_event->pixelDelta();
const QPoint numDegrees = wheel_event->angleDelta() / 8;
int numSteps;
if (not numPixels.isNull())
{
numSteps = numPixels.y();
}
else if (not numDegrees.isNull())
{
numSteps = numDegrees.y() / 15;
}
else
{
return true;//Just ignore
}
_numScheduledScalings += numSteps;
if (_numScheduledScalings * numSteps < 0)
{ // if user moved the wheel in another direction, we reset
_numScheduledScalings = numSteps; // previously scheduled scalings
}
if (anim->state() != QTimeLine::Running)
{
anim->start();
}
return true;
}
}
return QObject::eventFilter(object, event);
}
//---------------------------------------------------------------------------------------------------------------------

3
src/libs/vwidgets/vmaingraphicsview.h
View File

@ -73,6 +73,8 @@ signals:
public slots:
void scrollingTime(qreal x);
void animFinished();
protected:
virtual bool eventFilter(QObject* object, QEvent* event) Q_DECL_OVERRIDE;
private:
Q_DISABLE_COPY(GraphicsViewZoom)
QGraphicsView* _view;
@ -84,7 +86,6 @@ private:
/** @brief _numScheduledScalings keep number scheduled scalings. */
qint32 _numScheduledScalings;
virtual bool eventFilter(QObject* object, QEvent* event) Q_DECL_OVERRIDE;
void FictiveSceneRect(QGraphicsScene *sc, QGraphicsView *view);
};