From 3b4f00ecb54432f514f184c251a316896a88f91a Mon Sep 17 00:00:00 2001 From: Robin Burchell Date: Fri, 8 Jul 2016 13:25:02 +0200 Subject: Layouts: Use QQuickItemChangeListener for more things MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signal connections are expensive: even with qmlobject_connect, there's a bunch of memory allocation. By avoiding the signal connections, we can do the same thing essentially, a little faster. This gives me another 15-20 RowLayout instances per frame when testing with RowLayout containing 5 Rectangles on qmlbench (from ~139 to ~155 ops/frame). Change-Id: I4448a28128dc251e40b6b06d642bae716af212f4 Reviewed-by: Jan Arve Sæther --- src/imports/layouts/qquicklayout.cpp | 32 ++++++++++++++---- src/imports/layouts/qquicklayout_p.h | 4 +++ src/imports/layouts/qquicklinearlayout.cpp | 54 ++++++++++-------------------- src/imports/layouts/qquicklinearlayout_p.h | 9 +++-- 4 files changed, 51 insertions(+), 48 deletions(-) (limited to 'src/imports') diff --git a/src/imports/layouts/qquicklayout.cpp b/src/imports/layouts/qquicklayout.cpp index 07ada75a5f..3786d21727 100644 --- a/src/imports/layouts/qquicklayout.cpp +++ b/src/imports/layouts/qquicklayout.cpp @@ -763,18 +763,14 @@ void QQuickLayout::itemChange(ItemChange change, const ItemChangeData &value) { if (change == ItemChildAddedChange) { QQuickItem *item = value.item; - qmlobject_connect(item, QQuickItem, SIGNAL(implicitWidthChanged()), this, QQuickLayout, SLOT(invalidateSenderItem())); - qmlobject_connect(item, QQuickItem, SIGNAL(implicitHeightChanged()), this, QQuickLayout, SLOT(invalidateSenderItem())); qmlobject_connect(item, QQuickItem, SIGNAL(baselineOffsetChanged(qreal)), this, QQuickLayout, SLOT(invalidateSenderItem())); - QQuickItemPrivate::get(item)->addItemChangeListener(this, QQuickItemPrivate::SiblingOrder); + QQuickItemPrivate::get(item)->addItemChangeListener(this, QQuickItemPrivate::SiblingOrder | QQuickItemPrivate::ImplicitWidth | QQuickItemPrivate::ImplicitHeight | QQuickItemPrivate::Destroyed | QQuickItemPrivate::Visibility); if (isReady()) updateLayoutItems(); } else if (change == ItemChildRemovedChange) { QQuickItem *item = value.item; - qmlobject_disconnect(item, QQuickItem, SIGNAL(implicitWidthChanged()), this, QQuickLayout, SLOT(invalidateSenderItem())); - qmlobject_disconnect(item, QQuickItem, SIGNAL(implicitHeightChanged()), this, QQuickLayout, SLOT(invalidateSenderItem())); qmlobject_disconnect(item, QQuickItem, SIGNAL(baselineOffsetChanged(qreal)), this, QQuickLayout, SLOT(invalidateSenderItem())); - QQuickItemPrivate::get(item)->removeItemChangeListener(this, QQuickItemPrivate::SiblingOrder); + QQuickItemPrivate::get(item)->removeItemChangeListener(this, QQuickItemPrivate::SiblingOrder | QQuickItemPrivate::ImplicitWidth | QQuickItemPrivate::ImplicitHeight | QQuickItemPrivate::Destroyed | QQuickItemPrivate::Visibility); if (isReady()) updateLayoutItems(); } @@ -812,6 +808,30 @@ void QQuickLayout::itemSiblingOrderChanged(QQuickItem *item) updateLayoutItems(); } +void QQuickLayout::itemImplicitWidthChanged(QQuickItem *item) +{ + if (!isReady() || item->signalsBlocked()) + return; + invalidate(item); +} + +void QQuickLayout::itemImplicitHeightChanged(QQuickItem *item) +{ + if (!isReady() || item->signalsBlocked()) + return; + invalidate(item); +} + +void QQuickLayout::itemDestroyed(QQuickItem *item) +{ + Q_UNUSED(item); +} + +void QQuickLayout::itemVisibilityChanged(QQuickItem *item) +{ + Q_UNUSED(item); +} + void QQuickLayout::rearrange(const QSizeF &/*size*/) { m_dirty = false; diff --git a/src/imports/layouts/qquicklayout_p.h b/src/imports/layouts/qquicklayout_p.h index c7f04c1fed..eece6f8658 100644 --- a/src/imports/layouts/qquicklayout_p.h +++ b/src/imports/layouts/qquicklayout_p.h @@ -99,6 +99,10 @@ public: /* QQuickItemChangeListener */ void itemSiblingOrderChanged(QQuickItem *item) Q_DECL_OVERRIDE; + void itemImplicitWidthChanged(QQuickItem *item) Q_DECL_OVERRIDE; + void itemImplicitHeightChanged(QQuickItem *item) Q_DECL_OVERRIDE; + void itemDestroyed(QQuickItem *item) Q_DECL_OVERRIDE; + void itemVisibilityChanged(QQuickItem *item) Q_DECL_OVERRIDE; protected: void updatePolish() Q_DECL_OVERRIDE; diff --git a/src/imports/layouts/qquicklinearlayout.cpp b/src/imports/layouts/qquicklinearlayout.cpp index 7fad395a29..13fdd496c2 100644 --- a/src/imports/layouts/qquicklinearlayout.cpp +++ b/src/imports/layouts/qquicklinearlayout.cpp @@ -303,17 +303,13 @@ QQuickGridLayoutBase::~QQuickGridLayoutBase() { Q_D(QQuickGridLayoutBase); - /* Avoid messy deconstruction, should give: - * Faster deconstruction - * Less risk of signals reaching already deleted objects - */ + // Remove item listeners so we do not act on signalling unnecessarily + // (there is no point, as the layout will be torn down anyway). for (int i = 0; i < itemCount(); ++i) { QQuickItem *item = itemAt(i); - qmlobject_disconnect(item, QQuickItem, SIGNAL(destroyed()), this, QQuickGridLayoutBase, SLOT(onItemDestroyed())); - qmlobject_disconnect(item, QQuickItem, SIGNAL(visibleChanged()), this, QQuickGridLayoutBase, SLOT(onItemVisibleChanged())); - qmlobject_disconnect(item, QQuickItem, SIGNAL(implicitWidthChanged()), this, QQuickGridLayoutBase, SLOT(invalidateSenderItem())); - qmlobject_disconnect(item, QQuickItem, SIGNAL(implicitHeightChanged()), this, QQuickGridLayoutBase, SLOT(invalidateSenderItem())); + QQuickItemPrivate::get(item)->removeItemChangeListener(this, QQuickItemPrivate::SiblingOrder | QQuickItemPrivate::ImplicitWidth | QQuickItemPrivate::ImplicitHeight | QQuickItemPrivate::Destroyed | QQuickItemPrivate::Visibility); } + delete d->styleInfo; } @@ -436,23 +432,6 @@ int QQuickGridLayoutBase::itemCount() const return d->engine.itemCount(); } -void QQuickGridLayoutBase::itemChange(ItemChange change, const ItemChangeData &value) -{ - if (change == ItemChildAddedChange) { - quickLayoutDebug() << "ItemChildAddedChange"; - QQuickItem *item = value.item; - qmlobject_connect(item, QQuickItem, SIGNAL(destroyed()), this, QQuickGridLayoutBase, SLOT(onItemDestroyed())); - qmlobject_connect(item, QQuickItem, SIGNAL(visibleChanged()), this, QQuickGridLayoutBase, SLOT(onItemVisibleChanged())); - } else if (change == ItemChildRemovedChange) { - quickLayoutDebug() << "ItemChildRemovedChange"; - QQuickItem *item = value.item; - qmlobject_disconnect(item, QQuickItem, SIGNAL(destroyed()), this, QQuickGridLayoutBase, SLOT(onItemDestroyed())); - qmlobject_disconnect(item, QQuickItem, SIGNAL(visibleChanged()), this, QQuickGridLayoutBase, SLOT(onItemVisibleChanged())); - } - - QQuickLayout::itemChange(change, value); -} - void QQuickGridLayoutBase::removeGridItem(QGridLayoutItem *gridItem) { Q_D(QQuickGridLayoutBase); @@ -461,28 +440,29 @@ void QQuickGridLayoutBase::removeGridItem(QGridLayoutItem *gridItem) d->engine.removeRows(index, 1, d->orientation); } -void QQuickGridLayoutBase::onItemVisibleChanged() -{ - if (!isReady()) - return; - quickLayoutDebug() << "QQuickGridLayoutBase::onItemVisibleChanged"; - updateLayoutItems(); -} - -void QQuickGridLayoutBase::onItemDestroyed() +void QQuickGridLayoutBase::itemDestroyed(QQuickItem *item) { if (!isReady()) return; Q_D(QQuickGridLayoutBase); - quickLayoutDebug() << "QQuickGridLayoutBase::onItemDestroyed"; - QQuickItem *inDestruction = static_cast(sender()); - if (QQuickGridLayoutItem *gridItem = d->engine.findLayoutItem(inDestruction)) { + quickLayoutDebug() << "QQuickGridLayoutBase::itemDestroyed"; + if (QQuickGridLayoutItem *gridItem = d->engine.findLayoutItem(item)) { removeGridItem(gridItem); delete gridItem; invalidate(); } } +void QQuickGridLayoutBase::itemVisibilityChanged(QQuickItem *item) +{ + Q_UNUSED(item); + + if (!isReady()) + return; + quickLayoutDebug() << "QQuickGridLayoutBase::itemVisibilityChanged"; + updateLayoutItems(); +} + void QQuickGridLayoutBase::rearrange(const QSizeF &size) { Q_D(QQuickGridLayoutBase); diff --git a/src/imports/layouts/qquicklinearlayout_p.h b/src/imports/layouts/qquicklinearlayout_p.h index 86404f8d79..c289416540 100644 --- a/src/imports/layouts/qquicklinearlayout_p.h +++ b/src/imports/layouts/qquicklinearlayout_p.h @@ -77,6 +77,10 @@ public: Qt::LayoutDirection effectiveLayoutDirection() const; void setAlignment(QQuickItem *item, Qt::Alignment align) Q_DECL_OVERRIDE; + /* QQuickItemChangeListener */ + void itemDestroyed(QQuickItem *item) Q_DECL_OVERRIDE; + void itemVisibilityChanged(QQuickItem *item) Q_DECL_OVERRIDE; + protected: void updateLayoutItems() Q_DECL_OVERRIDE; QQuickItem *itemAt(int index) const Q_DECL_OVERRIDE; @@ -84,15 +88,10 @@ protected: void rearrange(const QSizeF &size) Q_DECL_OVERRIDE; virtual void insertLayoutItems() {} - void itemChange(ItemChange change, const ItemChangeData &data) Q_DECL_OVERRIDE; signals: Q_REVISION(1) void layoutDirectionChanged(); -protected slots: - void onItemVisibleChanged(); - void onItemDestroyed(); - private: void removeGridItem(QGridLayoutItem *gridItem); Q_DECLARE_PRIVATE(QQuickGridLayoutBase) -- cgit v1.2.3