QQuickTableView: drain pool upon setting reuseItems to false

As (soon to be) documented, drain the pool immediately when setting
reuseItems to false. This will give developers a way to clear
the pool if e.g running low on memory. Besides, there is no reason
to keep items in the pool if we're not reusing them.

Change-Id: I49f0283721a63c6a6b92631f00c7ad711a262978
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/auto/quick/qquicktableview/tst_qquicktableview.cpp b/tests/auto/quick/qquicktableview/tst_qquicktableview.cpp
index e4ac5b805b..b49164a78c 100644
--- a/tests/auto/quick/qquicktableview/tst_qquicktableview.cpp
+++ b/tests/auto/quick/qquicktableview/tst_qquicktableview.cpp
@@ -119,6 +119,7 @@ private slots:
     void checkRowColumnCount();
     void modelSignals();
     void dataChangedSignal();
+    void checkThatPoolIsDrainedWhenReuseIsFalse();
     void checkIfDelegatesAreReused_data();
     void checkIfDelegatesAreReused();
     void checkIfDelegatesAreReusedAsymmetricTableSize();
@@ -1309,6 +1310,24 @@ void tst_QQuickTableView::dataChangedSignal()
     }
 }
 
+void tst_QQuickTableView::checkThatPoolIsDrainedWhenReuseIsFalse()
+{
+    // Check that the reuse pool is drained
+    // immediately when setting reuseItems to false.
+    LOAD_TABLEVIEW("countingtableview.qml");
+
+    auto model = TestModelAsVariant(100, 100);
+    tableView->setModel(model);
+
+    WAIT_UNTIL_POLISHED;
+
+    // The pool should now contain preloaded items
+    QVERIFY(tableViewPrivate->tableModel->poolSize() > 0);
+    tableView->setReuseItems(false);
+    // The pool should now be empty
+    QCOMPARE(tableViewPrivate->tableModel->poolSize(), 0);
+}
+
 void tst_QQuickTableView::checkIfDelegatesAreReused_data()
 {
     QTest::addColumn<bool>("reuseItems");