Improve visibility into Positioner positioning from QML

Add a forceLayout function, similar to the views, as well
as a signal that indicates when positioning has completed.

Change-Id: Ice01ea0840c707e403fdd4ea59d92a89e2ed8e4b
Task-number: QTBUG-44762
Task-number: QTBUG-32114
Reviewed-by: J-P Nurmi <jpnurmi@qt.io>

1 files changed, 75 insertions, 0 deletions

diff --git a/tests/auto/qmltest/positioners/tst_positioners.qml b/tests/auto/qmltest/positioners/tst_positioners.qml
new file mode 100644
index 0000000000..03a0e13225
--- /dev/null
+++ b/tests/auto/qmltest/positioners/tst_positioners.qml
@@ -0,0 +1,75 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.9
+import QtTest 1.1
+
+Item {
+    Column {
+        id: column
+        Repeater {
+            id: repeater
+            model: 2
+            Rectangle {
+                width: 100
+                height: 30
+                border.width: 1
+            }
+        }
+    }
+
+    SignalSpy {
+        id: spy
+        target: column
+        signalName: "positioningComplete"
+    }
+
+    TestCase {
+        function test_forceLayout() {
+            compare(column.height, 60)
+            repeater.model = 4
+            column.forceLayout()
+            compare(column.height, 120)
+
+            // initial positioning and our forced layout
+            compare(spy.count, 2)
+        }
+    }
+}