114 lines
4.1 KiB
Diff
114 lines
4.1 KiB
Diff
From b91f07532b02f68161ec525bd44501d91ad19b38 Mon Sep 17 00:00:00 2001
|
|
From: Volker Hilsheimer <volker.hilsheimer@qt.io>
|
|
Date: Wed, 9 Nov 2022 15:34:11 +0100
|
|
Subject: [PATCH 19/21] QQuickItem: avoid emitting signals during destruction
|
|
|
|
If a QQuickItem is in the QQuickItem destructor, then it is both unsafe
|
|
and unnecessary to emit property change notifications. Connected code
|
|
can no longer rely on the state of the emitting object - if it was
|
|
originally a subclass of QQuickItem, then those subclass destructors
|
|
will already have run. And the QQuickItem destructor will also have
|
|
partially run, leaving the object in an undefined state.
|
|
|
|
Add a flag that we set to true at the top of ~QQuickItem, and don't emit
|
|
visibleChildrenChanged, parentChanged, visibleChanged, and
|
|
childrenChanged for items that are partially destroyed already.
|
|
|
|
[ChangeLog][Qt Quick][QQuickItem] QQuickItem no longer emits change
|
|
notifications for the parent, children, visible, and visibleChildren
|
|
properties while it is being destroyed.
|
|
|
|
Task-number: QTBUG-107850
|
|
Change-Id: I36ea98842c89ad89fcc1c4a328d138f66f2a0446
|
|
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
|
|
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
|
|
(cherry picked from commit 74873324bdf3399753f9fcaf7461c0e00df628b1)
|
|
---
|
|
src/quick/items/qquickitem.cpp | 21 +++++++++++++--------
|
|
src/quick/items/qquickitem_p.h | 1 +
|
|
2 files changed, 14 insertions(+), 8 deletions(-)
|
|
|
|
diff --git a/src/quick/items/qquickitem.cpp b/src/quick/items/qquickitem.cpp
|
|
index 462147adbd..4cf73ff73d 100644
|
|
--- a/src/quick/items/qquickitem.cpp
|
|
+++ b/src/quick/items/qquickitem.cpp
|
|
@@ -2327,6 +2327,7 @@ QQuickItem::QQuickItem(QQuickItemPrivate &dd, QQuickItem *parent)
|
|
QQuickItem::~QQuickItem()
|
|
{
|
|
Q_D(QQuickItem);
|
|
+ d->inDestructor = true;
|
|
|
|
if (d->windowRefCount > 1)
|
|
d->windowRefCount = 1; // Make sure window is set to null in next call to derefWindow().
|
|
@@ -2694,9 +2695,8 @@ void QQuickItem::setParentItem(QQuickItem *parentItem)
|
|
|
|
const bool wasVisible = isVisible();
|
|
op->removeChild(this);
|
|
- if (wasVisible) {
|
|
+ if (wasVisible && !op->inDestructor)
|
|
emit oldParentItem->visibleChildrenChanged();
|
|
- }
|
|
} else if (d->window) {
|
|
QQuickWindowPrivate::get(d->window)->parentlessItems.remove(this);
|
|
}
|
|
@@ -2773,8 +2773,9 @@ void QQuickItem::setParentItem(QQuickItem *parentItem)
|
|
|
|
d->itemChange(ItemParentHasChanged, d->parentItem);
|
|
|
|
- emit parentChanged(d->parentItem);
|
|
- if (isVisible() && d->parentItem)
|
|
+ if (!d->inDestructor)
|
|
+ emit parentChanged(d->parentItem);
|
|
+ if (isVisible() && d->parentItem && !QQuickItemPrivate::get(d->parentItem)->inDestructor)
|
|
emit d->parentItem->visibleChildrenChanged();
|
|
}
|
|
|
|
@@ -2970,7 +2971,8 @@ void QQuickItemPrivate::removeChild(QQuickItem *child)
|
|
|
|
itemChange(QQuickItem::ItemChildRemovedChange, child);
|
|
|
|
- emit q->childrenChanged();
|
|
+ if (!inDestructor)
|
|
+ emit q->childrenChanged();
|
|
}
|
|
|
|
void QQuickItemPrivate::refWindow(QQuickWindow *c)
|
|
@@ -3199,6 +3201,7 @@ QQuickItemPrivate::QQuickItemPrivate()
|
|
, touchEnabled(false)
|
|
#endif
|
|
, hasCursorHandler(false)
|
|
+ , inDestructor(false)
|
|
, dirtyAttributes(0)
|
|
, nextDirtyItem(nullptr)
|
|
, prevDirtyItem(nullptr)
|
|
@@ -6118,9 +6121,11 @@ bool QQuickItemPrivate::setEffectiveVisibleRecur(bool newEffectiveVisible)
|
|
QAccessible::updateAccessibility(&ev);
|
|
}
|
|
#endif
|
|
- emit q->visibleChanged();
|
|
- if (childVisibilityChanged)
|
|
- emit q->visibleChildrenChanged();
|
|
+ if (!inDestructor) {
|
|
+ emit q->visibleChanged();
|
|
+ if (childVisibilityChanged)
|
|
+ emit q->visibleChildrenChanged();
|
|
+ }
|
|
|
|
return true; // effective visibility DID change
|
|
}
|
|
diff --git a/src/quick/items/qquickitem_p.h b/src/quick/items/qquickitem_p.h
|
|
index 841d91bb40..ade8fb61f2 100644
|
|
--- a/src/quick/items/qquickitem_p.h
|
|
+++ b/src/quick/items/qquickitem_p.h
|
|
@@ -472,6 +472,7 @@ public:
|
|
bool replayingPressEvent:1;
|
|
bool touchEnabled:1;
|
|
bool hasCursorHandler:1;
|
|
+ quint32 inDestructor:1; // has entered ~QQuickItem
|
|
|
|
enum DirtyType {
|
|
TransformOrigin = 0x00000001,
|
|
--
|
|
2.39.0
|
|
|