/*!
If this item is a QLayout, it is returned as a QLayout; otherwise
- 0 is returned. This function provides type-safe casting.
+ null is returned. This function provides type-safe casting.
*/
-QLayout * QLayoutItem::layout()
+QLayout* QLayoutItem::layout()
{
return nullptr;
}
/*!
If this item is a QSpacerItem, it is returned as a QSpacerItem;
- otherwise 0 is returned. This function provides type-safe casting.
+ otherwise null is returned. This function provides type-safe casting.
*/
-QSpacerItem * QLayoutItem::spacerItem()
+QSpacerItem* QLayoutItem::spacerItem()
{
- return 0;
+ return nullptr;
}
/*!
\reimp
*/
-QLayout * QLayout::layout()
+QLayout* QLayout::layout()
{
return this;
}
If this item is a QWidget, it is returned as a QWidget; otherwise
0 is returned. This function provides type-safe casting.
*/
-QWidget * QLayoutItem::widget()
+QWidget* QLayoutItem::widget()
{
- return 0;
+ return nullptr;
}
/*!
Returns the widget managed by this item.
*/
-QWidget *QWidgetItem::widget()
+QWidget* QWidgetItem::widget()
{
return wid;
}
return heightForWidth(w);
}
-
/*!
Returns the preferred height for this layout item, given the width
\a w.
*/
QSize QWidgetItem::minimumSize() const
{
- if (isEmpty())
+ if (isEmpty()) {
return QSize(0, 0);
+ }
return !wid->testAttribute(Qt::WA_LayoutUsesWidgetRect)
? toLayoutItemSize(wid->d_func(), qSmartMinSize(this))
: qSmartMinSize(this);
{
if (isEmpty()) {
return QSize(0, 0);
- } else {
- return !wid->testAttribute(Qt::WA_LayoutUsesWidgetRect)
- ? toLayoutItemSize(wid->d_func(), qSmartMaxSize(this, align))
- : qSmartMaxSize(this, align);
}
+ return !wid->testAttribute(Qt::WA_LayoutUsesWidgetRect)
+ ? toLayoutItemSize(wid->d_func(), qSmartMaxSize(this, align))
+ : qSmartMaxSize(this, align);
}
/*!
*/
QSize QWidgetItem::sizeHint() const
{
- QSize s(0, 0);
- if (!isEmpty()) {
- s = wid->sizeHint().expandedTo(wid->minimumSizeHint());
- s = s.boundedTo(wid->maximumSize())
- .expandedTo(wid->minimumSize());
- s = !wid->testAttribute(Qt::WA_LayoutUsesWidgetRect)
- ? toLayoutItemSize(wid->d_func(), s)
- : s;
-
- if (wid->sizePolicy().horizontalPolicy() == QSizePolicy::Ignored)
- s.setWidth(0);
- if (wid->sizePolicy().verticalPolicy() == QSizePolicy::Ignored)
- s.setHeight(0);
+ if (isEmpty()) {
+ return QSize(0, 0);
+ }
+ QSize s = wid->sizeHint().expandedTo(wid->minimumSizeHint());
+ s = s.boundedTo(wid->maximumSize())
+ .expandedTo(wid->minimumSize());
+ s = !wid->testAttribute(Qt::WA_LayoutUsesWidgetRect)
+ ? toLayoutItemSize(wid->d_func(), s)
+ : s;
+
+ if (wid->sizePolicy().horizontalPolicy() == QSizePolicy::Ignored) {
+ s.setWidth(0);
+ }
+ if (wid->sizePolicy().verticalPolicy() == QSizePolicy::Ignored) {
+ s.setHeight(0);
}
return s;
}
return wid->sizePolicy().controlType();
}
-/*!
- \class QWidgetItemV2
- \internal
-*/
-
-inline bool QWidgetItemV2::useSizeCache() const
-{
- return wid->d_func()->widgetItem == this;
-}
-
-void QWidgetItemV2::updateCacheIfNecessary() const
-{
- if (q_cachedMinimumSize.width() != Dirty)
- return;
-
- const QSize sizeHint(wid->sizeHint());
- const QSize minimumSizeHint(wid->minimumSizeHint());
- const QSize minimumSize(wid->minimumSize());
- const QSize maximumSize(wid->maximumSize());
- const QSizePolicy sizePolicy(wid->sizePolicy());
- const QSize expandedSizeHint(sizeHint.expandedTo(minimumSizeHint));
-
- const QSize smartMinSize(qSmartMinSize(sizeHint, minimumSizeHint, minimumSize, maximumSize, sizePolicy));
- const QSize smartMaxSize(qSmartMaxSize(expandedSizeHint, minimumSize, maximumSize, sizePolicy, align));
-
- const bool useLayoutItemRect = !wid->testAttribute(Qt::WA_LayoutUsesWidgetRect);
-
- q_cachedMinimumSize = useLayoutItemRect
- ? toLayoutItemSize(wid->d_func(), smartMinSize)
- : smartMinSize;
-
- q_cachedSizeHint = expandedSizeHint;
- q_cachedSizeHint = q_cachedSizeHint.boundedTo(maximumSize)
- .expandedTo(minimumSize);
- q_cachedSizeHint = useLayoutItemRect
- ? toLayoutItemSize(wid->d_func(), q_cachedSizeHint)
- : q_cachedSizeHint;
-
- if (wid->sizePolicy().horizontalPolicy() == QSizePolicy::Ignored)
- q_cachedSizeHint.setWidth(0);
- if (wid->sizePolicy().verticalPolicy() == QSizePolicy::Ignored)
- q_cachedSizeHint.setHeight(0);
-
- q_cachedMaximumSize = useLayoutItemRect
- ? toLayoutItemSize(wid->d_func(), smartMaxSize)
- : smartMaxSize;
-}
-
-QWidgetItemV2::QWidgetItemV2(QWidget *widget)
- : QWidgetItem(widget),
- q_cachedMinimumSize(Dirty, Dirty),
- q_cachedSizeHint(Dirty, Dirty),
- q_cachedMaximumSize(Dirty, Dirty),
- q_firstCachedHfw(0),
- q_hfwCacheSize(0),
- d(0)
-{
- QWidgetPrivate *wd = wid->d_func();
- if (!wd->widgetItem)
- wd->widgetItem = this;
-}
-
-QWidgetItemV2::~QWidgetItemV2()
-{
- if (wid) {
- QWidgetPrivate *wd = wid->d_func();
- if (wd->widgetItem == this)
- wd->widgetItem = 0;
- }
-}
-
-QSize QWidgetItemV2::sizeHint() const
-{
- if (isEmpty())
- return QSize(0, 0);
-
- if (useSizeCache()) {
- updateCacheIfNecessary();
- return q_cachedSizeHint;
- } else {
- return QWidgetItem::sizeHint();
- }
-}
-
-QSize QWidgetItemV2::minimumSize() const
-{
- if (isEmpty())
- return QSize(0, 0);
-
- if (useSizeCache()) {
- updateCacheIfNecessary();
- return q_cachedMinimumSize;
- } else {
- return QWidgetItem::minimumSize();
- }
-}
-
-QSize QWidgetItemV2::maximumSize() const
-{
- if (isEmpty())
- return QSize(0, 0);
-
- if (useSizeCache()) {
- updateCacheIfNecessary();
- return q_cachedMaximumSize;
- } else {
- return QWidgetItem::maximumSize();
- }
-}
-
-/*
- The height-for-width cache is organized as a circular buffer. The entries
-
- q_hfwCachedHfws[q_firstCachedHfw],
- ...,
- q_hfwCachedHfws[(q_firstCachedHfw + q_hfwCacheSize - 1) % HfwCacheMaxSize]
-
- contain the last cached values. When the cache is full, the first entry to
- be erased is the entry before q_hfwCachedHfws[q_firstCachedHfw]. When
- values are looked up, we try to move q_firstCachedHfw to point to that new
- entry (unless the cache is not full, in which case it would leave the cache
- in a broken state), so that the most recently used entry is also the last
- to be erased.
-*/
-
-int QWidgetItemV2::heightForWidth(int width) const
-{
- if (isEmpty())
- return -1;
-
- for (int i = 0; i < q_hfwCacheSize; ++i) {
- int offset = q_firstCachedHfw + i;
- const QSize &size = q_cachedHfws[offset % HfwCacheMaxSize];
- if (size.width() == width) {
- if (q_hfwCacheSize == HfwCacheMaxSize)
- q_firstCachedHfw = offset;
- return size.height();
- }
- }
-
- if (q_hfwCacheSize < HfwCacheMaxSize)
- ++q_hfwCacheSize;
- q_firstCachedHfw = (q_firstCachedHfw + HfwCacheMaxSize - 1) % HfwCacheMaxSize;
-
- int height = QWidgetItem::heightForWidth(width);
- q_cachedHfws[q_firstCachedHfw] = QSize(width, height);
- return height;
-}
-
QT_END_NAMESPACE
-
-
-
-
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