QQmlDelegateModel: implement support for reusing items

Take the shared reuse pool into use, and implement delegate
item recycling in QQmlDelegateModel. The implementation is
more or less a copy of the strategy followed in
QQmlTableInstanceModel.

Change-Id: I80953ec617f586774a240e7c6790b7777e7b64b8
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 6 insertions, 1 deletions

diff --git a/src/qmlmodels/qqmldelegatemodel_p.h b/src/qmlmodels/qqmldelegatemodel_p.h
index 6db5768f63..adb5f7008b 100644
--- a/src/qmlmodels/qqmldelegatemodel_p.h
+++ b/src/qmlmodels/qqmldelegatemodel_p.h
@@ -113,12 +113,15 @@ public:
     int count() const override;
     bool isValid() const override { return delegate() != nullptr; }
     QObject *object(int index, QQmlIncubator::IncubationMode incubationMode = QQmlIncubator::AsynchronousIfNested) override;
-    ReleaseFlags release(QObject *object, ReusableFlag reusable = NotReusable) override;
+    ReleaseFlags release(QObject *object, ReusableFlag reusableFlag = NotReusable) override;
     void cancel(int index) override;
     QVariant variantValue(int index, const QString &role) override;
     void setWatchedRoles(const QList<QByteArray> &roles) override;
     QQmlIncubator::Status incubationStatus(int index) override;
 
+    void drainReusableItemsPool(int maxPoolTime) override;
+    int poolSize() override;
+
     int indexOf(QObject *object, QObject *objectContext) const override;
 
     QString filterGroup() const;
@@ -141,6 +144,8 @@ Q_SIGNALS:
     void defaultGroupsChanged();
     void rootIndexChanged();
     void delegateChanged();
+    void itemPooled(int index, QObject *object);
+    void itemReused(int index, QObject *object);
 
 private Q_SLOTS:
     void _q_itemsChanged(int index, int count, const QVector<int> &roles);