diff options
Diffstat (limited to 'src/gui/graphicsview/qgraphicswidget_p.cpp')
| -rw-r--r-- | src/gui/graphicsview/qgraphicswidget_p.cpp | 164 |
1 files changed, 139 insertions, 25 deletions
diff --git a/src/gui/graphicsview/qgraphicswidget_p.cpp b/src/gui/graphicsview/qgraphicswidget_p.cpp index 787bbb1..bf826a9 100644 --- a/src/gui/graphicsview/qgraphicswidget_p.cpp +++ b/src/gui/graphicsview/qgraphicswidget_p.cpp @@ -393,49 +393,162 @@ void QGraphicsWidgetPrivate::windowFrameMousePressEvent(QGraphicsSceneMouseEvent event->setAccepted(windowData->grabbedSection != Qt::NoSection); } +/*! + Used to calculate the + Precondition: + \a widget should support either hfw or wfh + + If \a heightForWidth is set to false, this function will query the width for height + instead. \a width will then be interpreted as height, \a minh and \a maxh will be interpreted + as minimum width and maximum width. + */ +static qreal minimumHeightForWidth(qreal width, qreal minh, qreal maxh, + const QGraphicsWidget *widget, + bool heightForWidth = true) +{ + qreal minimumHeightForWidth = -1; + const QSizePolicy sp = widget->layout() ? widget->layout()->sizePolicy() : widget->sizePolicy(); + const bool hasHFW = sp.hasHeightForWidth(); + if (hasHFW == heightForWidth) { + minimumHeightForWidth = hasHFW + ? widget->effectiveSizeHint(Qt::MinimumSize, QSizeF(width, -1)).height() + : widget->effectiveSizeHint(Qt::MinimumSize, QSizeF(-1, width)).width(); //"width" is here height! + } else { + // widthForHeight + const qreal constraint = width; + while (maxh - minh > 0.1) { + qreal middle = minh + (maxh - minh)/2; + // ### really bad, if we are a widget with a layout it will call + // layout->effectiveSizeHint(Qt::MiniumumSize), which again will call + // sizeHint three times because of how the cache works + qreal hfw = hasHFW + ? widget->effectiveSizeHint(Qt::MinimumSize, QSizeF(middle, -1)).height() + : widget->effectiveSizeHint(Qt::MinimumSize, QSizeF(-1, middle)).width(); + if (hfw > constraint) { + minh = middle; + } else if (hfw <= constraint) { + maxh = middle; + } + } + minimumHeightForWidth = maxh; + } + return minimumHeightForWidth; +} + +static qreal minimumWidthForHeight(qreal height, qreal minw, qreal maxw, + const QGraphicsWidget *widget) +{ + return minimumHeightForWidth(height, minw, maxw, widget, false); +} + +static QSizeF closestAcceptableSize(const QSizeF &proposed, + const QGraphicsWidget *widget) +{ + const QSizeF current = widget->size(); + + qreal minw = proposed.width(); + qreal maxw = current.width(); + qreal minh = proposed.height(); + qreal maxh = current.height(); + + qreal middlew = maxw; + qreal middleh = maxh; + qreal min_hfw; + min_hfw = minimumHeightForWidth(maxw, minh, maxh, widget); + + do { + if (maxw - minw < 0.1) { + // we still havent found anything, cut off binary search + minw = maxw; + minh = maxh; + } + middlew = minw + (maxw - minw)/2.0; + middleh = minh + (maxh - minh)/2.0; + + min_hfw = minimumHeightForWidth(middlew, minh, maxh, widget); + + if (min_hfw > middleh) { + minw = middlew; + minh = middleh; + } else if (min_hfw <= middleh) { + maxw = middlew; + maxh = middleh; + } + } while (maxw != minw); + + min_hfw = minimumHeightForWidth(middlew, minh, maxh, widget); + + QSizeF result; + if (min_hfw < maxh) { + result = QSizeF(middlew, min_hfw); + } else { + // Needed because of the cut-off we do above. + result = QSizeF(minimumWidthForHeight(maxh, proposed.width(), current.width(), widget), maxh); + } + return result; +} + static void _q_boundGeometryToSizeConstraints(const QRectF &startGeometry, QRectF *rect, Qt::WindowFrameSection section, - const QSizeF &min, const QSizeF &max) + const QSizeF &min, const QSizeF &max, + const QGraphicsWidget *widget) { - int height; - int width; + const QRectF proposedRect = *rect; + qreal width = qBound(min.width(), proposedRect.width(), max.width()); + qreal height = qBound(min.height(), proposedRect.height(), max.height()); + + QSizePolicy sp = widget->sizePolicy(); + if (const QGraphicsLayout *l = widget->layout()) { + sp = l->sizePolicy(); + } + const bool hasHFW = sp.hasHeightForWidth(); // || sp.hasWidthForHeight(); + + const bool widthChanged = proposedRect.width() < widget->size().width(); + const bool heightChanged = proposedRect.height() < widget->size().height(); + + if (hasHFW) { + if (widthChanged || heightChanged) { + const qreal minh = min.height(); + const qreal maxh = max.height(); + const qreal proposedHFW = minimumHeightForWidth(width, minh, maxh, widget); + if (proposedHFW > proposedRect.height()) { + QSizeF effectiveSize = closestAcceptableSize(QSizeF(width, height), widget); + width = effectiveSize.width(); + height = effectiveSize.height(); + } + } + } + switch (section) { case Qt::LeftSection: - width = qRound(qBound(min.width(), rect->width(), max.width())); - rect->setRect(startGeometry.right() - width, startGeometry.top(), - width, startGeometry.height()); + rect->setRect(startGeometry.right() - qRound(width), startGeometry.top(), + qRound(width), startGeometry.height()); break; case Qt::TopLeftSection: - width = qRound(qBound(min.width(), rect->width(), max.width())); - height = qRound(qBound(min.height(), rect->height(), max.height())); - rect->setRect(startGeometry.right() - width, startGeometry.bottom() - height, - width, height); + rect->setRect(startGeometry.right() - qRound(width), startGeometry.bottom() - qRound(height), + qRound(width), qRound(height)); break; case Qt::TopSection: - height = qRound(qBound(min.height(), rect->height(), max.height())); - rect->setRect(startGeometry.left(), startGeometry.bottom() - height, - startGeometry.width(), height); + rect->setRect(startGeometry.left(), startGeometry.bottom() - qRound(height), + startGeometry.width(), qRound(height)); break; case Qt::TopRightSection: - height = qRound(qBound(min.height(), rect->height(), max.height())); - rect->setTop(rect->bottom() - height); - rect->setWidth(qBound(min.width(), rect->width(), max.width())); + rect->setTop(rect->bottom() - qRound(height)); + rect->setWidth(qRound(width)); break; case Qt::RightSection: - rect->setWidth(qBound(min.width(), rect->width(), max.width())); + rect->setWidth(qRound(width)); break; case Qt::BottomRightSection: - rect->setWidth(qBound(min.width(), rect->width(), max.width())); - rect->setHeight(qBound(min.height(), rect->height(), max.height())); + rect->setWidth(qRound(width)); + rect->setHeight(qRound(height)); break; case Qt::BottomSection: - rect->setHeight(qBound(min.height(), rect->height(), max.height())); + rect->setHeight(qRound(height)); break; case Qt::BottomLeftSection: - height = qRound(qBound(min.height(), rect->height(), max.height())); - width = qRound(qBound(min.width(), rect->width(), max.width())); - rect->setRect(startGeometry.right() - width, startGeometry.top(), - width, height); + rect->setRect(startGeometry.right() - qRound(width), startGeometry.top(), + qRound(width), qRound(height)); break; default: break; @@ -506,7 +619,8 @@ void QGraphicsWidgetPrivate::windowFrameMouseMoveEvent(QGraphicsSceneMouseEvent _q_boundGeometryToSizeConstraints(windowData->startGeometry, &newGeometry, windowData->grabbedSection, q->effectiveSizeHint(Qt::MinimumSize), - q->effectiveSizeHint(Qt::MaximumSize)); + q->effectiveSizeHint(Qt::MaximumSize), + q); q->setGeometry(newGeometry); } } |