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chore: add max zoom-in scale limit (1000x)

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This commit is contained in:
Gary Wang
2021-02-18 20:03:17 +08:00
parent 2b4bbc91a7
commit 858c9e0ccf
5 changed files with 33 additions and 11 deletions
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13
app/graphicsview.cpp
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@ -7,6 +7,7 @@
#include <QScrollBar>
#include <QMimeData>
#include <QImageReader>
#include <QStyleOptionGraphicsItem>
GraphicsView::GraphicsView(QWidget *parent)
: QGraphicsView (parent)
@ -109,12 +110,7 @@ void GraphicsView::setScene(GraphicsScene *scene)
qreal GraphicsView::scaleFactor() const
{
int angle = static_cast<int>(m_rotateAngle);
if (angle == 0 || angle == 180) {
return qAbs(transform().m11());
} else {
return qAbs(transform().m12());
}
return QStyleOptionGraphicsItem::levelOfDetailFromTransform(transform());
}
void GraphicsView::resetTransform()
@ -209,10 +205,13 @@ void GraphicsView::resizeEvent(QResizeEvent *event)
if (m_enableFitInView) {
QTransform tf;
tf.rotate(m_rotateAngle);
if (isThingSmallerThanWindowWith(tf) && scaleFactor() >= 1) {
bool originalSizeSmallerThanWindow = isThingSmallerThanWindowWith(tf);
if (originalSizeSmallerThanWindow && scaleFactor() >= 1) {
// no longer need to do fitInView()
// but we leave the m_enableFitInView value unchanged in case
// user resize down the window again.
} else if (originalSizeSmallerThanWindow && scaleFactor() < 1) {
resetScale();
} else {
fitInView(sceneRect(), Qt::KeepAspectRatio);
}