diff options
Diffstat (limited to 'src/gui/graphicsview/qgraphicsitem.cpp')
| -rw-r--r-- | src/gui/graphicsview/qgraphicsitem.cpp | 127 |
1 files changed, 122 insertions, 5 deletions
diff --git a/src/gui/graphicsview/qgraphicsitem.cpp b/src/gui/graphicsview/qgraphicsitem.cpp index 36203de..f014543 100644 --- a/src/gui/graphicsview/qgraphicsitem.cpp +++ b/src/gui/graphicsview/qgraphicsitem.cpp @@ -381,7 +381,9 @@ \value ItemSendsGeometryChanges The item enables itemChange() notifications for ItemPositionChange, ItemPositionHasChanged, - ItemMatrixChange, ItemTransformChange, and ItemTransformHasChanged. For + ItemMatrixChange, ItemTransformChange, ItemTransformHasChanged, + ItemRotationChange, ItemRotationHasChanged, ItemScaleChange, ItemScaleHasChanged, + ItemTransformOriginPointChange, and ItemTransformOriginPointHasChanged. For performance reasons, these notifications are disabled by default. You must enable this flag to receive notifications for position and transform changes. This flag was introduced in Qt 4.6. @@ -475,6 +477,52 @@ (same as transform()), and QGraphicsItem ignores the return value for this notification (i.e., a read-only notification). + \value ItemRotationChange The item's rotation property changes. This + notification is sent if the ItemSendsGeometryChanges flag is enabled, and + when the item's rotation property changes (i.e., as a result of calling + setRotation()). The value argument is the new rotation (i.e., a double); + to get the old rotation, call rotation(). Do not call setRotation() in + itemChange() as this notification is delivered; instead, you can return + the new rotation from itemChange(). + + \value ItemRotationHasChanged The item's rotation property has changed. + This notification is sent if the ItemSendsGeometryChanges flag is enabled, + and after the item's rotation property has changed. The value argument is + the new rotation (i.e., a double), and QGraphicsItem ignores the return + value for this notification (i.e., a read-only notification). Do not call + setRotation() in itemChange() as this notification is delivered. + + \value ItemScaleChange The item's scale property changes. This notification + is sent if the ItemSendsGeometryChanges flag is enabled, and when the item's + scale property changes (i.e., as a result of calling setScale()). The value + argument is the new scale (i.e., a double); to get the old scale, call + scale(). Do not call setScale() in itemChange() as this notification is + delivered; instead, you can return the new scale from itemChange(). + + \value ItemScaleHasChanged The item's scale property has changed. This + notification is sent if the ItemSendsGeometryChanges flag is enabled, and + after the item's scale property has changed. The value argument is the new + scale (i.e., a double), and QGraphicsItem ignores the return value for this + notification (i.e., a read-only notification). Do not call setScale() in + itemChange() as this notification is delivered. + + \value ItemTransformOriginPointChange The item's transform origin point + property changes. This notification is sent if the ItemSendsGeometryChanges + flag is enabled, and when the item's transform origin point property changes + (i.e., as a result of calling setTransformOriginPoint()). The value argument + is the new origin point (i.e., a QPointF); to get the old origin point, call + transformOriginPoint(). Do not call setTransformOriginPoint() in itemChange() + as this notification is delivered; instead, you can return the new transform + origin point from itemChange(). + + \value ItemTransformOriginPointHasChanged The item's transform origin point + property has changed. This notification is sent if the ItemSendsGeometryChanges + flag is enabled, and after the item's transform origin point property has + changed. The value argument is the new origin point (i.e., a QPointF), and + QGraphicsItem ignores the return value for this notification (i.e., a read-only + notification). Do not call setTransformOriginPoint() in itemChange() as this + notification is delivered. + \value ItemSelectedChange The item's selected state changes. If the item is presently selected, it will become unselected, and vice verca. The value argument is the new selected state (i.e., true or false). Do not call @@ -3727,12 +3775,28 @@ qreal QGraphicsItem::rotation() const void QGraphicsItem::setRotation(qreal angle) { prepareGeometryChange(); + qreal newRotation = angle; + + if (d_ptr->flags & ItemSendsGeometryChanges) { + // Notify the item that the rotation is changing. + const QVariant newRotationVariant(itemChange(ItemRotationChange, angle)); + newRotation = newRotationVariant.toReal(); + } + if (!d_ptr->transformData) d_ptr->transformData = new QGraphicsItemPrivate::TransformData; - d_ptr->transformData->rotation = angle; + + if (d_ptr->transformData->rotation == newRotation) + return; + + d_ptr->transformData->rotation = newRotation; d_ptr->transformData->onlyTransform = false; d_ptr->dirtySceneTransform = 1; + // Send post-notification. + if (d_ptr->flags & ItemSendsGeometryChanges) + itemChange(ItemRotationHasChanged, newRotation); + if (d_ptr->isObject) emit static_cast<QGraphicsObject *>(this)->rotationChanged(); } @@ -3775,12 +3839,28 @@ qreal QGraphicsItem::scale() const void QGraphicsItem::setScale(qreal factor) { prepareGeometryChange(); + qreal newScale = factor; + + if (d_ptr->flags & ItemSendsGeometryChanges) { + // Notify the item that the scale is changing. + const QVariant newScaleVariant(itemChange(ItemScaleChange, factor)); + newScale = newScaleVariant.toReal(); + } + if (!d_ptr->transformData) d_ptr->transformData = new QGraphicsItemPrivate::TransformData; - d_ptr->transformData->scale = factor; + + if (d_ptr->transformData->scale == newScale) + return; + + d_ptr->transformData->scale = newScale; d_ptr->transformData->onlyTransform = false; d_ptr->dirtySceneTransform = 1; + // Send post-notification. + if (d_ptr->flags & ItemSendsGeometryChanges) + itemChange(ItemScaleHasChanged, newScale); + if (d_ptr->isObject) emit static_cast<QGraphicsObject *>(this)->scaleChanged(); } @@ -3898,12 +3978,31 @@ QPointF QGraphicsItem::transformOriginPoint() const void QGraphicsItem::setTransformOriginPoint(const QPointF &origin) { prepareGeometryChange(); + QPointF newOrigin = origin; + + if (d_ptr->flags & ItemSendsGeometryChanges) { + // Notify the item that the origin point is changing. + const QVariant newOriginVariant(itemChange(ItemTransformOriginPointChange, + qVariantFromValue<QPointF>(origin))); + newOrigin = newOriginVariant.toPointF(); + } + if (!d_ptr->transformData) d_ptr->transformData = new QGraphicsItemPrivate::TransformData; - d_ptr->transformData->xOrigin = origin.x(); - d_ptr->transformData->yOrigin = origin.y(); + + if (d_ptr->transformData->xOrigin == newOrigin.x() + && d_ptr->transformData->yOrigin == newOrigin.y()) { + return; + } + + d_ptr->transformData->xOrigin = newOrigin.x(); + d_ptr->transformData->yOrigin = newOrigin.y(); d_ptr->transformData->onlyTransform = false; d_ptr->dirtySceneTransform = 1; + + // Send post-notification. + if (d_ptr->flags & ItemSendsGeometryChanges) + itemChange(ItemTransformOriginPointHasChanged, qVariantFromValue<QPointF>(newOrigin)); } /*! @@ -11196,6 +11295,24 @@ QDebug operator<<(QDebug debug, QGraphicsItem::GraphicsItemChange change) case QGraphicsItem::ItemScenePositionHasChanged: str = "ItemScenePositionHasChanged"; break; + case QGraphicsItem::ItemRotationChange: + str = "ItemRotationChange"; + break; + case QGraphicsItem::ItemRotationHasChanged: + str = "ItemRotationHasChanged"; + break; + case QGraphicsItem::ItemScaleChange: + str = "ItemScaleChange"; + break; + case QGraphicsItem::ItemScaleHasChanged: + str = "ItemScaleHasChanged"; + break; + case QGraphicsItem::ItemTransformOriginPointChange: + str = "ItemTransformOriginPointChange"; + break; + case QGraphicsItem::ItemTransformOriginPointHasChanged: + str = "ItemTransformOriginPointHasChanged"; + break; } debug << str; return debug; |