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The recent simplification of the close button code introduced a crash:
Deletion of pictures caused an invalid memory access, because the
CloseButtonItem was deleted with the parent DivePicture item.
For some (not fully understood!) reason, a reference to this button
was stored in the depths of Qt.
Empirically, it was found out that removing the first line of the pair
QGraphicsItem::mousePressEvent(event);
emit clicked();
fixed the crash.
It seemed therefore prudent to remove the whole questionable signal/slot
mechanism and directly call the removePicture() function of the parent.
Thus, the intermediate DiveButtonItem class became unnecessary and was
removed, leading to a shallower class hierarchy.
Unfortunately, CloseButtonItem must still be derived from QObject owing
to the Q_PROPERTY machinery, which is in turn needed for animation.
To make this compile on mobile, the conditional compilation of
removePicture() (#ifndef SUBSURFACE_MOBILE) was removed. After all,
if DivePixmapItem is used, there are pictures, so removePicture()
should be functional. Conditional compilation should concern the
whole class, not only this function.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
// SPDX-License-Identifier: GPL-2.0
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#ifndef DIVEPIXMAPITEM_H
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#define DIVEPIXMAPITEM_H
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#include <QObject>
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#include <QGraphicsPixmapItem>
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class DivePixmapItem : public QObject, public QGraphicsPixmapItem {
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Q_OBJECT
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Q_PROPERTY(qreal opacity WRITE setOpacity READ opacity)
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Q_PROPERTY(QPointF pos WRITE setPos READ pos)
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Q_PROPERTY(qreal x WRITE setX READ x)
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Q_PROPERTY(qreal y WRITE setY READ y)
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public:
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DivePixmapItem(QGraphicsItem *parent = 0);
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};
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class CloseButtonItem : public DivePixmapItem {
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Q_OBJECT
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public:
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CloseButtonItem(QGraphicsItem *parent = 0);
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protected:
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virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);
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public slots:
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void hide();
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void show();
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};
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class DivePictureItem : public DivePixmapItem {
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Q_OBJECT
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Q_PROPERTY(qreal scale WRITE setScale READ scale)
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public:
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DivePictureItem(QGraphicsItem *parent = 0);
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void setPixmap(const QPixmap& pix);
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public slots:
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void settingsChanged();
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void removePicture();
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void setFileUrl(const QString& s);
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protected:
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void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
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void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
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void mousePressEvent(QGraphicsSceneMouseEvent *event);
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private:
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QString fileUrl;
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QGraphicsRectItem *canvas;
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QGraphicsRectItem *shadow;
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CloseButtonItem *button;
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};
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#endif // DIVEPIXMAPITEM_H
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