HI..
i want to add elements dynamically to listview in QT for symbian OS, i have set of delegate methods associated with listview.
if i add elements statically, the control comes to delegate methods, and view is perfect.
but if i add dynamically, control is not at all coming to delegate methods.
i don't no how to do it. ill place here some sample code, that how i am adding elements.
this is how i am setting the view,
MylistView = new QListView();
QDesktopWidget* desktopWidget = QApplication::desktop();
QRect clientRect = desktopWidget->geometry();
MylistView->setMinimumSize(QSize(clientRect.width()-7,clientRect.height()-1));
MylistView->setViewMode(QListView::ListMode);
MylistView->setMovement(QListView::Free);
MylistView->setItemDelegate(new ItemDeligate(MylistView));
MylistView->setSelectionMode(QAbstractItemView::SingleSelection);
bool val =GreenPixmap.load(":/new/prefix1/temp/test.png");
ListModel = new QStandardItemModel();
ListModel->appendColumn(ItemList);
MylistView->setModel(ListModel);
Listlayout.addWidget(MylistView);
Listlayout.addWidget(MylistView);
this->setLayout(&Listlayout);
AddItemMenu = new QAction("Add",this);
menuBar()->addAction(AddItemMenu);
val = connect(AddItemMenu,SIGNAL(triggered()),this,SLOT(addItem()));
This is how i am adding dynamically when the click event occurs, (i.e dynamically adding items)
QStandardItem *Items = new QStandardItem(QIcon(GreenPixmap),"Avatar");
Items->setData("WAKE UP",ItemDeligate::SubTextRole);
ItemList.append(Items);
ListModel->appendColumn(ItemList);
please suggest me, what mistake i am doing in adding elemetns
I just made this quick example in my app, it's working, maybe it will gibe you an hint :
QStandardItem* Items = new QStandardItem("Avatar");
QStandardItemModel* ListModel = new QStandardItemModel();
ListModel->appendRow(Items);
listView->setModel(ListModel);
In summary, you should simply append a row on your model ! It should fix your problem !
If I missed something, let me know !
Related
I have the following situation:
I have QSpinBox where the user of my application can select how many instances of an item he wants to create. In a next step, he has to designate a name for each item. I wanted to solve this problem by dynamically creating a number of QLabels and QLineEdits corresponding to the number the user selected in the SpinBox. So, when the number is rising, I want to add new LineEdits, when the number falls, I want to remove the now obsolete LineEdits.
Well, guess what - this turns out much more difficult than I expected. I've searched the web, but the results were more than disappointing. There seems to be no easy way to dynamically create, maintain (maybe in a list?) and destroy those widgets. Can anybody point me in the right direction how to do this?
Take a while and check QListWidget, it does what you exactly want for you by using QListWidgetItem.
An little example: this function adds a new element to a QListWidgetwith a defined QWidget as view and return the current index:
QModelIndex MainWindow::addNewItem(QWidget* widget) {
QListWidgetItem* item = new QListWidgetItem;
ui->listWidget->addItem(item1);
ui->listWidget->setItemWidget(item, widget);
return ui->listWidget->indexFromItem(item);
}
Now, if your user selects X items, you should iterate to create X widgets and you could save all the widgets in a QList:
listWidget.clear();
for (int i=0; i<X; i++) {
QTextEdit* edit = new QTextEdit();
const QModelIndex& index = addNetItem(edit);
qDebug() << "New element: " << index;
listWidget.append(edit);
// Handle edit text event
connect(edit, SIGNAL(textChanged()), this, SLOT(yourCustomHandler()));
}
Now, just show the list with all the edit fields.
I have a simple QComboBox widget, which has 2 values inside: True and False.
And I have a QString variable currValue, which is one of those values. I want to set my widget's current value with currValue.
I thought that solution is the following:
first lets initialize currValue;
QString currValue = "False";
QComboBox* combo = new QComboBox();
combo->addItem("True");
combo->addItem("False");
combo->setCurrentIndex(combo->findData(currValue));
But it doesn't work.
Am I doing something wrong ?
And Why QComboBox has no member setCurrentItem() or smth like that ?
You actually need to write it in the following way:
QComboBox* combo = new QComboBox();
combo->addItem("True", "True");
combo->addItem("False", "False");
combo->setCurrentIndex(combo->findData("False"));
The problem in your implementation was that you did not set the items' userData, but only text. In the same time you tried to find item by its userData which was empty.
With the given implementation, I just use the second argument of QComboBox::addItem(const QString &text, const QVariant &userData = QVariant())) function that sets the item's userData (QVariant).
UPDATE:
The alternative way to find the combo box item is setting the specific role as the second argument for QComboBox::findData() function. If you don't want to explicitly set the user data, you can refer to the items texts with Qt::DisplayRole flag, i.e.:
QComboBox* combo = new QComboBox();
combo->addItem("True");
combo->addItem("False");
combo->setCurrentIndex(combo->findData("False", Qt::DisplayRole)); // <- refers to the item text
UPDATE 2:
Another alternative could be using text based lookup function QComboBox::findText():
QComboBox* combo = new QComboBox();
combo->addItem("True");
combo->addItem("False");
combo->setCurrentIndex(combo->findText("False"));
I have got answer to my own question.
combo->setCurrentIndex(combo->findText(currValue));
I have a QCompleter using a QStringListModel for my QPlainTextEdit (check this example):
QStringListModel* model = new QStringListModel(names);
QCompleter* completer = new QCompleter(model);
completer->setCompletionMode(QCompleter::PopupCompletion);
completer->setModelSorting(QCompleter::UnsortedModel);
It works fine. Now I need some Icon, Tooltips for each suggestion I'm trying to use a QListWidget as custom popup:
QListWidget* w = new QListWidget();
foreach(name, names) {
QListWidgetItem* i = new QListWidgetItem(name);
i->setIcon(/*my Icon*/);
i->setToolTip("");
w->addItem(i);
}
completer->setPopup(w);
The popup ok, just like I need, but the completion no more work. I cannot type the text to make it filter the suggestion, just Up/Down key.
I have try:
completer->setModel(w->model());
but no help!
What is my misstake or just QStringListModel give me the ability to filter the suggestions? What do you suggest?
Thanks you!
I mostly deal with PyQt, but same deal. My syntax may be off, but you should use a QStandardItemModel vs. a QStringListModel. From there, you can leave it as the standard popup (QListView)
Something like:
QStandardItemModel* model = new QStandardItemModel();
// initialize the model
int rows = names.count(); // assuming this is a QStringList
model->setRowCount(rows);
model->setColumnCount(1);
// load the items
int row = 0;
foreach(name, names) {
QStandardItem* item = new QStandardItem(name);
item->setIcon(QIcon(":some/icon.png");
item->setToolTip("some tool tip");
model->setItem(row, 0, item);
row++;
}
completer->setModel(model);
completer->popup()->setModel(model); // may or may not be needed
A widget called Tachometer will update accordingly when a signal is sent from its corresponding model, but it will not respond at all when I add the widget to a layout. What might account for this? Without showing the internals of the model or the view (which would be exhaustive), I will attempt to point out where it is not working:
void MainWindow::setupWidgets()
{
QHBoxLayout *horiz1 = new QHBoxLayout();
QHBoxLayout *horiz2 = new QHBoxLayout();
odometer = new Odometer(ui->dashFrame);
fuelGauge = new FuelGauge(ui->dashFrame);
tripometer = new Tripometer(ui->dashFrame);
tachometer = new Tachometer(ui->dashFrame);
temperatureGauge = new TemperatureGauge(ui->dashFrame);
oilPressureGauge = new OilPressureGauge();
QVBoxLayout *vertOPG = new QVBoxLayout();
if ( oilPressureGauge->getTitle() != "" )
{
QLabel *OPGLabel = new QLabel(oilPressureGauge->getTitle());
vertOPG->addWidget(OPGLabel);
}
vertOPG->addWidget(oilPressureGauge);
speedometer = new Speedometer(ui->dashFrame);
horiz1->addWidget(tachometer);
horiz1->addWidget(speedometer);
horiz2->addWidget(fuelGauge);
horiz2->addWidget(temperatureGauge);
horiz2->addLayout(vertOPG);
horiz2->addWidget(tripometer);
horiz2->addWidget(odometer); // will NOT update when added to layout
QVBoxLayout *vert1 = new QVBoxLayout(ui->dashFrame);
vert1->addLayout(horiz1);
vert1->addLayout(horiz2);
this->ui->dashFrame->setLayout(vert1);
}
I am perplexed that the other Widgets will update as expected, but not the object named tachometer. As I said before, if I don't add it to the layout, e.g.
// ...
tachometer = new Tachometer(ui->dashFrame);
// ...
it appears to work just fine. Furthermore, by debugging on the console I see that the RPM value for the tachometer is being sent to the appropriate slot that updates the view for the tachometer (I just noticed the tachometer finally responded to the update, but it isn't updating after every timeout as it should). It seems like some latency issues are clearly involved here.
If anyone might have an idea as to why this might be, I would greatly appreciate some clarification.
I'm writing a flex program in an OO manner and I've got to the point of creating a ViewStack to hold various panels. My problem is that when I add a panel to the ViewStack it throws the aforementioned error. No doubt the answer is pretty obvious so here's the constructor for the manager class that holds my ViewStack.
stack = new ViewStack();
loginPanel = new LoginPanel;
regPanel = new RegisterPanel;
stack.creationPolicy = "all";
stack.addChild(loginPanel);
stack.currentState = "loginPanel";
I'm not sure why you are setting the currentState property of the ViewStack. Are you trying to select that child? If so, try using the selectedChild property instead. This should work:
{
stack = new ViewStack();
loginPanel = new LoginPanel();
regPanel = new RegisterPanel();
stack.creationPolicy = "all";
stack.addChild(loginPanel);
stack.selectedChild = loginPanel;
}