void QQuickStretchColumnContainer::updatePolish (void) {
const QList<QQuickItem *> childrenList = childItems ();
/// find items and stretchers
qreal tmpW = 0;
qreal tmpH = 0;
int nbItems = 0;
int nbStretch = 0;
for (QList<QQuickItem *>::const_iterator it = childrenList.constBegin (); it != childrenList.constEnd (); it++) {
QQuickItem * child = (* it);
if (child != Q_NULLPTR && !child->inherits ("QQuickRepeater") && child->isVisible ()) {
if (child->implicitWidth () > tmpW) {
tmpW = child->implicitWidth ();
}
if (child->implicitHeight () >= 0) {
tmpH += child->implicitHeight ();
}
else {
nbStretch++;
}
nbItems++;
}
}
/// resize layout
if (nbItems > 1) {
tmpH += (m_spacing * (nbItems -1));
}
setImplicitWidth (tmpW);
setImplicitHeight (tmpH);
const qreal layoutWidth = width ();
const qreal layoutHeight = height ();
const qreal autoSize = (nbStretch > 0 ? (layoutHeight - tmpH) / qreal (nbStretch) : 0);
/// position children
int currY = 0;
for (QList<QQuickItem *>::const_iterator it = childrenList.constBegin (); it != childrenList.constEnd (); it++) {
QQuickItem * child = (* it);
if (child != Q_NULLPTR && !child->inherits ("QQuickRepeater") && child->isVisible ()) {
if (currY) {
currY += m_spacing;
}
child->setY (currY);
child->setWidth (layoutWidth);
child->setHeight (child->implicitHeight () >= 0 ? child->implicitHeight () : autoSize);
currY += child->height ();
}
}
}
void StretchColumn::layoutChildrenWithDefaultSize() {
//static int count = 0;
//qDebug() << "Column Default Size" << ++count;
Q_ASSERT(m_defaultSize != 0);
const QList<QQuickItem *> childrenList = childItems();
if (childrenList.isEmpty()) return;
const int contentWidth = width() - m_leftMargin - m_rightMargin;
qreal currY = 0;
for (QList<QQuickItem *>::const_iterator it = childrenList.constBegin(); it != childrenList.constEnd(); ++it) {
QQuickItem* child = (*it);
if (child == Q_NULLPTR || !child->isVisible()) {
continue;
}
// add spacing if it is not the first item:
if (currY > 0) {
currY += m_spacing;
}
if (currY != child->y()) child->setY(currY);
// check if item has a stretch proportion set:
if (child->implicitHeight() < 0) {
// yes -> set it to default size multiplied by relative size:
qreal newHeight = m_defaultSize * child->implicitHeight() * -1;
if (newHeight != child->height()) child->setHeight(newHeight);
}
// set width of all items to fill the layout:
if (m_leftMargin != child->x()) child->setX(m_leftMargin);
if (contentWidth != child->width()) child->setWidth(contentWidth);
currY += child->height();
}
// set implicit size to fit all items:
if (currY != implicitHeight()) setImplicitHeight(currY);
}
void StretchColumn::itemChange(QQuickItem::ItemChange change, const QQuickItem::ItemChangeData & value) {
if (change == QQuickItem::ItemChildAddedChange) {
QQuickItem* child = value.item;
if (child != Q_NULLPTR) {
connect(child, &QQuickItem::visibleChanged,
this, &StretchColumn::polish, Qt::UniqueConnection);
if (child->implicitHeight() < 0) {
// only listen to implicitHeight changes if this is a relative-sized item
connect(child, &QQuickItem::implicitHeightChanged,
this, &StretchColumn::polish, Qt::UniqueConnection);
} else {
// only listen to height changes if this is a fixed-sized item
connect(child, &QQuickItem::heightChanged,
this, &StretchColumn::polish, Qt::UniqueConnection); // add | Qt::QueuedConnection?
}
}
}
}
void StretchColumn::layoutChildrenWithProportions() {
//static int count = 0;
//qDebug() << "Column Proportions" << ++count;
const QList<QQuickItem*> childrenList = childItems();
if (childrenList.isEmpty()) return;
if (height() <= 0) return;
int visibleItems = 0;
qreal availableForStretch = height();
qreal sumStretchProportions = 0.0;
// iterate over all children and calculate available size to stretch items:
for (QList<QQuickItem *>::const_iterator it = childrenList.constBegin(); it != childrenList.constEnd(); ++it) {
QQuickItem* child = (*it);
if (child == Q_NULLPTR || !child->isVisible()) {
continue;
}
if (child->implicitHeight() >= 0) {
// no stretch proportion set -> leave size and remove it from available space:
availableForStretch -= child->height();
} else {
// a stretch proportion is set -> add it to sum:
sumStretchProportions += (child->implicitHeight() * -1);
}
visibleItems++;
}
// remove spacing from available space:
availableForStretch -= m_spacing * (visibleItems - 1);
const int contentWidth = width() - m_leftMargin - m_rightMargin;
QPointer<QQuickItem> lastStretchItem = nullptr;
qreal currY = 0;
for (QList<QQuickItem *>::const_iterator it = childrenList.constBegin(); it != childrenList.constEnd(); ++it) {
QQuickItem* child = (*it);
if (child == Q_NULLPTR || !child->isVisible()) {
continue;
}
// add spacing if it is not the first item:
if (currY > 0) {
currY += m_spacing;
}
if (currY != child->y()) child->setY(currY);
// check if item has a stretch proportion set (if not do nothing):
if (child->implicitHeight() < 0) {
// get the stretch proportion:
qreal stretchProportion = (child->implicitHeight() * -1);
// calculate the relation of the total space available for stretched items
// that this item will use:
// (sumStretchProportion can not be 0 (in divison) because if this "if" is executed,
// there has been at least one item with a stretch proportion set)
qreal relationOfSpaceAvailableForStretch = stretchProportion / sumStretchProportions;
qreal newHeight = qRound(availableForStretch * relationOfSpaceAvailableForStretch);
if (newHeight != child->height()) child->setHeight(newHeight);
lastStretchItem = child;
}
// set width of all items to fill the layout:
if (m_leftMargin != child->x()) child->setX(m_leftMargin);
if (contentWidth != child->width()) child->setWidth(contentWidth);
currY += child->height();
}
// check if last item fills whole remaining space in this layout:
// (can happen because of rounding mistakes)
if (lastStretchItem) {
double pxMissing = height() - currY;
if (pxMissing > 0.0001) {
// qInfo() << "StretchColumn layout mismatch: " << pxMissing;
// it does not -> adjust it:
lastStretchItem->setHeight(lastStretchItem->height() + pxMissing);
}
}
}
void QQuickComponentsLinearLayout::reconfigureLayout()
{
if (!isComponentComplete())
return;
const int count = m_items.count();
if (count == 0)
return;
qreal totalSpacing = 0;
qreal totalSizeHint = 0;
qreal totalMinimumSize = 0;
qreal totalMaximumSize = 0;
QVector<QQuickComponentsLayoutInfo> itemData;
for (int i = 0; i < count; i++) {
QQuickItem *item = m_items.at(i);
QObject *attached = qmlAttachedPropertiesObject<QQuickComponentsLayout>(item);
QQuickComponentsLayoutAttached *info = static_cast<QQuickComponentsLayoutAttached *>(attached);
QQuickComponentsLayoutInfo data;
if (m_orientation == Horizontal) {
data.sizeHint = item->implicitWidth();
data.minimumSize = info->minimumWidth();
data.maximumSize = info->maximumWidth();
data.expansive = (info->horizontalSizePolicy() == QQuickComponentsLayout::Expanding);
data.stretch = info->horizontalSizePolicy() == Expanding ? 1.0 : 0;
} else {
data.sizeHint = item->implicitHeight();
data.minimumSize = info->minimumHeight();
data.maximumSize = info->maximumHeight();
data.expansive = (info->verticalSizePolicy() == QQuickComponentsLayout::Expanding);
data.stretch = info->verticalSizePolicy() == Expanding ? 1.0 : 0;
}
itemData.append(data);
// sum
totalSizeHint += data.sizeHint;
totalMinimumSize += data.minimumSize;
totalMaximumSize += data.maximumSize;
// don't count last spacing
if (i < count - 1)
totalSpacing += data.spacing + m_spacing;
}
if (m_orientation == Horizontal) {
qDeclarativeLayoutCalculate(itemData, 0, count, 0, width(), m_spacing);
for (int i = 0; i < count; i++) {
QQuickItem *item = m_items.at(i);
const QQuickComponentsLayoutInfo &data = itemData.at(i);
item->setX(data.pos);
item->setY(height()/2 - item->height()/2);
item->setWidth(data.size);
}
} else {
qDeclarativeLayoutCalculate(itemData, 0, count, 0, height(), m_spacing);
for (int i = 0; i < count; i++) {
QQuickItem *item = m_items.at(i);
const QQuickComponentsLayoutInfo &data = itemData.at(i);
item->setY(data.pos);
item->setX(width()/2 - item->width()/2);
item->setHeight(data.size);
}
}
// propagate hints to upper levels
QObject *attached = qmlAttachedPropertiesObject<QQuickComponentsLayout>(this);
QQuickComponentsLayoutAttached *info = static_cast<QQuickComponentsLayoutAttached *>(attached);
if (m_orientation == Horizontal) {
setImplicitWidth(totalSizeHint);
info->setMinimumWidth(totalMinimumSize + totalSpacing);
info->setMaximumWidth(totalMaximumSize + totalSpacing);
} else {
setImplicitHeight(totalSizeHint);
info->setMinimumHeight(totalMinimumSize + totalSpacing);
info->setMaximumHeight(totalMaximumSize + totalSpacing);
}
}