Remove the container blocks app
In my application the user can add new container objects to will be and I want to give them the ability to delete these objects as well. In my design, I have alread QML set for the container that contains other containers, a portion of text, and a context menu. Menu is in the context where I give the user the option to delete the container. When remove is called a C++ function goes through my data model and removes the container of the user interface and removes the application data model object. Problem is after I called the (container) remove call I call delete against the container and the application crashes. I think that the crash is because I'm calling Delete against the container too early, but I don't know, and if I'm what would be a good way to work around this problem? Here is a condensed version of the QML/code I use:
hand. QML. stationContainer is where all new containers are added and removed
// Application with UI adaptability support template
import bb.cascades 1.0
import bb.system 1.0
NavigationPane {
backButtonsVisible: true
id: navigationPane
objectName: "navigationPane"
// create application UI page
Page {
Container {
layout: DockLayout {
}
AppBackground {
// setup application background
background: Color.Black
verticalAlignment: VerticalAlignment.Fill
horizontalAlignment: HorizontalAlignment.Fill
}
Container {
horizontalAlignment: HorizontalAlignment.Fill
Container {
layoutProperties: StackLayoutProperties {
spaceQuota: 1.0
}
layout: DockLayout {
}
verticalAlignment: VerticalAlignment.Fill
horizontalAlignment: HorizontalAlignment.Fill
ScrollView {
scrollViewProperties {
scrollMode: ScrollMode.Vertical
}
Container {
property int padding: 10
objectName: "stationStacks"
layout: StackLayout {
id: stationStacks
// change layout direction according to current device orientation
// this feature is disabled for 720x720 devices in current template
// see: assets/720x720/AppOrientationHandler.qml
orientation: (orientationHandler.orientation == UIOrientation.Portrait) ? LayoutOrientation.TopToBottom : LayoutOrientation.LeftToRight
}
topPadding: padding
bottomPadding: padding
leftPadding: padding
rightPadding: padding
verticalAlignment: VerticalAlignment.Center
horizontalAlignment: HorizontalAlignment.Center
}
}
}
}
}
} // Page
onPopTransitionEnded: { page.destroy(); }
}// NavigationPane
Container for model that is reused.
import bb.cascades 1.0
Container {
topPadding: 25
layout: StackLayout {
orientation: LayoutOrientation.TopToBottom
}
Container {
layout: StackLayout {
orientation: LayoutOrientation.LeftToRight
}
Container {
Container {
id: identifierButton
objectName: "identifierButton"
layout: StackLayout {
orientation: LayoutOrientation.LeftToRight
}
contextActions: [
ActionSet {
title: "Actions"
subtitle: "This is an action set."
actions: [
ActionItem {
title: "Info"
onTriggered: {
app.showStationInfo(sIdentifier);
}
},
ActionItem {
title: "Refresh"
onTriggered: {
app.refreshStation(sIdentifier);
}
},
ActionItem {
title: "Remove"
onTriggered: {
app.removeStation(sIdentifier);
}
}
]
} // end of ActionSet
] // end of contextActions list
Label {
id: identifierLabel
text: "Label"
objectName: "identifierLabel"
}
onTouch: {
if (event.isDown() || event.isMove()) {
// Focused, change the background
identifierButton.background = Color.Gray;
} else {
identifierButton.background = Color.create("#ff21697d");
}
}
verticalAlignment: VerticalAlignment.Center
horizontalAlignment: HorizontalAlignment.Left
}
}
Container {
Label {
id: stationName
}
}
}
Container {
TextArea {
id: stationData
}
}
}
How to take the container of model and use:
/**
* Setup and add the UI object for the station
*/
void WeatherPilotApp::CreateStationUI(StationData *pStationData) {
Container *stackPane = mApp->findChild("stationStacks");
// Add the UI component
QmlDocument *qml =
QmlDocument::create("asset:///stationTafMetar.qml").property("app",
this).property("sIdentifier", pStationData);
Container *stationContainer = qml->createRootObject();
stationContainer->setObjectName(pStationData->getIdentifier());
QString objectName = QString::fromStdString("identifierLabel");
Label* label = stationContainer->findChild(objectName);
label->setText(pStationData->getIdentifier());
stackPane->insert(0, stationContainer);
}
The code to remove station is here:
void WeatherPilotApp::removeStation(QObject* qStationData) {
StationData* stationData = (StationData*) qStationData;
addRemoveStation(stationData->getIdentifier(), false);
}
/**
* Function will add, remove, or update all stations passed in as a
* comma or space separated list
*/
void WeatherPilotApp::addRemoveStation(QString sIdentifiers, bool bAdd) {
qDebug() << "AddStation " << sIdentifiers;
sIdentifiers.replace(',', ' ');
vector splitIdentifiers;
QStringList idList = sIdentifiers.split(' ', QString::SkipEmptyParts);
for (QStringList::const_iterator iter = idList.constBegin();
iter != idList.constEnd(); ++iter) {
QString id = (*iter).toLocal8Bit().constData();
splitIdentifiers.push_back(id.toUpper());
qDebug() << "Added " << id;
}
if (bAdd) {
//handle addition logic
}
// Remove the stations
else {
for (unsigned int idx = 0; idx < splitIdentifiers.size(); idx++) {
for (vector::iterator it = mActiveStations.begin();
it != mActiveStations.end();) {
if (((StationData*) *it)->getIdentifier().compare(
splitIdentifiers[idx]) == 0) {
delete *it; // delete the StationData object
it = mActiveStations.erase(it); // Remove it from the vector
break;
} else {
it++;
}
} // Get the main parent container
Container *stackPane = mApp->findChild("stationStacks"); // Get a pointer to this stations Container pointer
Container *stationContainer = stackPane->findChild(
splitIdentifiers[idx]);
bool success = stackPane->remove(stationContainer);
if (!success) {
qDebug() << "Failed to remove " << splitIdentifiers[idx];
} else {
delete stationContainer; // free up the memory
}
}
}
}
Try deleteLater() and see if it makes a difference, but to be honest, I do exactly the same thing in my code...
void CardEditor::onFieldRemoved(TitleValueField* tvf) {
if (tvf) {
CardLabelEdit* c = mLabelMap.value(tvf);
if (c) {
remove(c);
delete c;
mLabelMap.remove(tvf);
}
}
}
This command removes a CustomControl which is basically just a container with two TextFields in so pretty similar to what you want to do.
My guess is that the problem is elsewhere perhaps with your vectorial cartography or your logic of pointer, try putting some checks and/or set a breakpoint on the removal of line and see the status of your vector and pointers at this time there.
If you have configured all signals with these dynamic objects, you also need to exercise caution.
[Edit] There was a good discussion about deleteLater in this thread...
Tags: BlackBerry Developers
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