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Undo the crop, colours and original of a picture with its pixels

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Cropping, keying out a colour, mirroring and replacing a picture set
its crop rectangle, transparent colours and original directly and put
only the displayed pixmap into the undo command. After Ctrl+Z the
picture looked right, but a save still wrote the undone crop and
colours, and the picture came back cropped once reopened; a later
crop or colour dialog also started from the undone values. The three
are now one property, imageSource, changed in the same undo step as
the pixmap.

The crop itself moves out of the dialog into applyCrop(), so that it
can be applied without one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Beat Hangartner
2026-10-04 19:45:03 +02:00
parent ecf995174e
commit 5cbd65c1d4
2 changed files with 79 additions and 9 deletions
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sources/qetgraphicsitem/diagramimageitem.cpp
+60 -9
View File
@@ -194,6 +194,30 @@ void DiagramImageItem::setPixmap(const QPixmap &pixmap) {
emit pixmapChanged();
}
/**
@brief DiagramImageItem::setImageSource
Set the picture's source -- original, crop rectangle and transparent
colours. Only stores them: the displayed pixmap is a property of its
own, set by the same undo command.
*/
void DiagramImageItem::setImageSource(const ImageSource &source)
{
m_base_pixmap = source.base;
m_crop_rect = source.crop;
m_transparent_colors = source.colors;
}
QVariant DiagramImageItem::imageSourceVariant() const
{
return QVariant::fromValue(imageSource());
}
void DiagramImageItem::setImageSourceVariant(const QVariant &source)
{
if (source.canConvert<ImageSource>())
setImageSource(source.value<ImageSource>());
}
/**
@brief DiagramImageItem::setScaleFactorX / setScaleFactorY / setRotationAngle
Matching QetShapeItem's own setters for the identical fields --
@@ -1814,12 +1838,13 @@ void DiagramImageItem::replaceImage()
// or region was cropped for the old one, so this starts that
// memory fresh rather than carrying over choices that would no
// longer make sense.
m_base_pixmap = newPixmap;
m_crop_rect = newPixmap.rect();
m_transparent_colors.clear();
const ImageSource oldSource = imageSource();
const ImageSource newSource{newPixmap, newPixmap.rect(), {}};
auto *undo = new QPropertyUndoCommand(this, "pixmap", oldPixmap, newPixmap);
undo->setText(tr("Remplacer une image"));
new QPropertyUndoCommand(this, "imageSource", QVariant::fromValue(oldSource),
QVariant::fromValue(newSource), undo);
// Every call here is a separate, deliberate menu action with no
// compound child of its own (unlike crop(), which always chains a
// pos/rawPivot change and is naturally immune) -- two of them in a
@@ -1854,7 +1879,9 @@ void DiagramImageItem::mirror(bool horizontal)
// colour values don't change when the image is mirrored, only their
// positions, so whatever was already keyed transparent should stay
// remembered and still apply correctly to the flipped version.
m_base_pixmap = m_base_pixmap.transformed(flip);
const ImageSource oldSource = imageSource();
ImageSource newSource = oldSource;
newSource.base = m_base_pixmap.transformed(flip);
// m_crop_rect, unlike the colour list, DOES need to change: it's
// defined in terms of positions within the base, and those
@@ -1864,14 +1891,16 @@ void DiagramImageItem::mirror(bool horizontal)
// whether this reads m_base_pixmap's size from before or after the
// assignment above).
if (horizontal)
m_crop_rect = QRect(m_base_pixmap.width() - m_crop_rect.left() - m_crop_rect.width(),
newSource.crop = QRect(m_base_pixmap.width() - m_crop_rect.left() - m_crop_rect.width(),
m_crop_rect.top(), m_crop_rect.width(), m_crop_rect.height());
else
m_crop_rect = QRect(m_crop_rect.left(), m_base_pixmap.height() - m_crop_rect.top() - m_crop_rect.height(),
newSource.crop = QRect(m_crop_rect.left(), m_base_pixmap.height() - m_crop_rect.top() - m_crop_rect.height(),
m_crop_rect.width(), m_crop_rect.height());
auto *undo = new QPropertyUndoCommand(this, "pixmap", oldPixmap, newPixmap);
undo->setText(horizontal ? tr("Miroir horizontal d'une image") : tr("Miroir vertical d'une image"));
new QPropertyUndoCommand(this, "imageSource", QVariant::fromValue(oldSource),
QVariant::fromValue(newSource), undo);
// See replaceImage()'s identical comment: a separate, deliberate
// action with no compound child of its own, so a dummy one is
// needed to stop two consecutive same-direction mirrors (identical
@@ -1919,13 +1948,17 @@ void DiagramImageItem::setTransparentColor()
if (dialog.exec() != QDialog::Accepted)
return;
m_transparent_colors = dialog.pickedColors();
const ImageSource oldSource = imageSource();
ImageSource newSource = oldSource;
newSource.colors = dialog.pickedColors();
const QPixmap oldPixmap = pixmap_;
const QPixmap newPixmap = dialog.resultPixmap();
auto *undo = new QPropertyUndoCommand(this, "pixmap", oldPixmap, newPixmap);
undo->setText(tr("Définir une couleur transparente"));
new QPropertyUndoCommand(this, "imageSource", QVariant::fromValue(oldSource),
QVariant::fromValue(newSource), undo);
// See replaceImage()'s identical comment: a separate, deliberate
// action with no compound child of its own, so a dummy one is
// needed to stop two consecutive transparency edits (identical
@@ -1994,7 +2027,21 @@ void DiagramImageItem::crop()
if (dialog.exec() != QDialog::Accepted)
return;
const QRect newCropRect = dialog.cropRect();
applyCrop(dialog.cropRect());
}
/**
@brief DiagramImageItem::applyCrop
Show @a newCropRect of the original (in the original's own pixels),
keeping the centre of the kept region where it is on the folio. One
undo step, which restores the pixmap, the position, the pivot and the
crop rectangle together.
*/
void DiagramImageItem::applyCrop(const QRect &cropRect)
{
if (!diagram() || diagram()->isReadOnly())
return;
const QRect newCropRect = cropRect.intersected(m_base_pixmap.rect());
if (newCropRect.isEmpty() || newCropRect == m_crop_rect)
return; // nothing actually changed
@@ -2009,7 +2056,9 @@ void DiagramImageItem::crop()
const QPixmap oldPixmap = pixmap_;
const QPixmap newPixmap = computeDisplayPixmap(m_base_pixmap, newCropRect, m_transparent_colors);
m_crop_rect = newCropRect;
const ImageSource oldSource = imageSource();
ImageSource newSource = oldSource;
newSource.crop = newCropRect;
// boundingRect() is exactly QRectF(pixmap_.rect()) (confirmed by
// reading the actual implementation, not assumed) -- so the new
@@ -2027,6 +2076,8 @@ void DiagramImageItem::crop()
undo->setText(tr("Rogner une image"));
new QPropertyUndoCommand(this, "pos", oldPos, newPos, undo);
new QPropertyUndoCommand(this, "rawPivot", oldPivot, newOriginPoint, undo);
new QPropertyUndoCommand(this, "imageSource", QVariant::fromValue(oldSource),
QVariant::fromValue(newSource), undo);
m_pivotIsCustom = false;
diagram()->undoStack().push(undo);
}
sources/qetgraphicsitem/diagramimageitem.h
+19
View File
@@ -49,6 +49,10 @@ class DiagramImageItem : public QetGraphicsItem {
Q_PROPERTY(qreal skewY READ skewY WRITE setSkewY NOTIFY transformChanged)
Q_PROPERTY(QPointF pivot READ pivot WRITE setPivot NOTIFY transformChanged)
Q_PROPERTY(QString label READ label WRITE setLabel NOTIFY labelChanged)
// The picture's source -- original, crop rectangle, transparent
// colours -- as one value, so that every edit of it (crop, colour
// key, mirror, replace) is undone together with the displayed pixmap.
Q_PROPERTY(QVariant imageSource READ imageSourceVariant WRITE setImageSourceVariant)
// A second, deliberately non-compensating property on the SAME
// underlying value -- setPivot() (above) intentionally adjusts
// pos() to keep the image visually in place, which is exactly
@@ -65,6 +69,19 @@ class DiagramImageItem : public QetGraphicsItem {
DiagramImageItem(QetGraphicsItem * = nullptr);
DiagramImageItem(const QPixmap &pixmap, QetGraphicsItem * = nullptr);
~DiagramImageItem() override;
struct ImageSource
{
QPixmap base;
QRect crop;
QList<ImageTransparentColorDialog::PickedColor> colors;
};
ImageSource imageSource() const { return {m_base_pixmap, m_crop_rect, m_transparent_colors}; }
void setImageSource(const ImageSource &source);
QVariant imageSourceVariant() const;
void setImageSourceVariant(const QVariant &source);
QRect cropRect() const { return m_crop_rect; }
void applyCrop(const QRect &cropRect);
// attributes
public:
@@ -246,4 +263,6 @@ class DiagramImageItem : public QetGraphicsItem {
QPointF m_label_scale{1.0, 1.0}; // scale the label rect was last computed for -- see updateLabelScale()
bool m_resizeCenterAnchored = false; // decided once, at press time -- see handlerMousePressEvent()'s comment for why, mirroring the identical fix already made for shape creation
};
Q_DECLARE_METATYPE(DiagramImageItem::ImageSource)
#endif