** Description changed:
This is the cause for the Sections index resetting after initialization,
see bug 1610231.
- Create the file ModelTest.qml:
-
+ Use this code:
+ ------ ModelFromList13.qml ------
import QtQuick 2.4
+ // This component is used in tst_listview_bug1621509.13.qml
Item {
- id: root
- width: 800
- height: 600
+ id: root
+ property var myObject
+ property int count: 0 // will hold the number of changes to myObject
after Component.completed.
- ListView {
- model: root.model
- onModelChanged: print("LV model changed to "+model[0]+" "+model[1]+"
"+model[2]+" "+model[3])
- Component.onCompleted: print("ListView completed.")
- }
- Component.onCompleted: print("root item completed.")
-
- property list<QtObject> objectList
- onObjectListChanged: print("root.objectList changed to "+objectList[0]+"
"+objectList[1]+" "+objectList[2])
- property var model: objectList
+ onMyObjectChanged: {
+ print("myObject changed to "+myObject)
+ count++;
+ }
+ Component.onCompleted: {
+ count = 0;
+ }
}
- And run this program modelInst.qml:
+ ------ tst_list_model_from_list_bug1621509.13.qml ------
+ import QtQuick 2.4
+ import QtTest 1.0
- import QtQuick 2.4
+ // Ubuntu.Components is not explicitly used below, but its import causes bug
#1621509.
import Ubuntu.Components 1.3
- ModelTest {
- QtObject {
- objectName: "one"
- id: objectOne
- }
- QtObject {
- objectName: "two"
- id: objectTwo
- }
- QtObject{
- objectName: "three"
- id: objectThree
- }
+ TestCase {
+ id: testCase
+ name: "EmbeddedListView"
+ width: 100
+ height: 100
- objectList: [objectOne, objectTwo, objectThree]
+ // Bug #1621509 only occurs when we wait for the window to be visible.
+ // Forces the components to be completed before the test functions are
executed.
+ when: windowShown
+
+ ModelFromList13 {
+ id: embeddedListView
+ QtObject {
+ objectName: "one"
+ id: objectOne
+ }
+ myObject: objectOne
+ }
+
+ Component.onCompleted: {
+ print("Component completed."); // must print something to reproduce
the bug.
+ }
+
+ function test_no_model_change_after_completed_bug1621509_bug1610231() {
+ compare(embeddedListView.count, 0,
+ "The model was changed after the component was completed.");
+ }
}
+ ----------
- The output is as follows:
-
- $ qmlscene modelInst.qml
- qml: root.objectList changed to undefined undefined undefined
- qml: root.objectList changed to QObject(0x118abf0, "one") undefined undefined
- qml: root.objectList changed to QObject(0x118abf0, "one") QObject(0x118a110,
"two") undefined
- qml: root.objectList changed to QObject(0x118abf0, "one") QObject(0x118a110,
"two") QObject(0x1182f80, "three")
- qml: LV model changed to QObject(0x118abf0, "one") QObject(0x118a110, "two")
QObject(0x1182f80, "three") undefined
- qml: LV model changed to QObject(0x118abf0, "one") QObject(0x118a110, "two")
QObject(0x1182f80, "three") undefined
- qml: root item completed.
- qml: ListView completed.
- qml: LV model changed to QObject(0x118abf0, "one") QObject(0x118a110, "two")
QObject(0x1182f80, "three") undefined
- qml: LV model changed to QObject(0x118abf0, "one") QObject(0x118a110, "two")
QObject(0x1182f80, "three") undefined
-
- So the model is changed AFTER the ListView and root item are completed.
-
- When the Ubuntu.Components import is removed the output is correct:
-
- $ qmlscene modelInst.qml
- qml: root.objectList changed to undefined undefined undefined
- qml: root.objectList changed to QObject(0x171c8d0, "one") undefined undefined
- qml: root.objectList changed to QObject(0x171c8d0, "one") QObject(0x171d290,
"two") undefined
- qml: root.objectList changed to QObject(0x171c8d0, "one") QObject(0x171d290,
"two") QObject(0x171d420, "three")
- qml: LV model changed to QObject(0x171c8d0, "one") QObject(0x171d290, "two")
QObject(0x171d420, "three") undefined
- qml: LV model changed to QObject(0x171c8d0, "one") QObject(0x171d290, "two")
QObject(0x171d420, "three") undefined
- qml: root item completed.
- qml: ListView completed.
-
- Also, if there is no ListView inside ModelTest.qml, then nothing is
- updated after the items are completed. So I suspect the issue is in our
- ListView extension.
+ the test will fail. Also, one can replace the TestCase by Item (and
+ remove when: windowShown) and simply use qmlscene to start the app. It
+ will show that myObject is set twice: before the component completed,
+ and then again afterwards. I suspect the reason for this is the change
+ of the 'window' context property which causes everything in the context
+ (objectOne) and properties that depend on that to be re-evaluated.
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https://bugs.launchpad.net/bugs/1621509
Title:
'window' contextProperty is registered after components are completed
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