I have a QListview where I have set a model. The model contains the QList. Now I want to get the contents of QListview on clicking the item. But I don't know how to do this? Through some tutorials I followed I am able to get two items appear in the QListview as follows. But I dont know how to make it work?? Please anyone help. The code which I am working as follows.
listviewmodel =new QListView;
listviewmodel->setModel( createModel() );
listviewmodel->setViewMode(QListView::IconMode);
listviewmodel->setIconSize(QSize(size().width()/8, size().height()/8));
connect(listviewmodel,SIGNAL(clicked(const QModelIndex)),this,SLOT(ItemClicked(QModelIndex)));
QAbstractItemModel *MainWindow::createModel()
{
QStandardItemModel *model = new QStandardItemModel();
QList<QStandardItem *> listItem;
QStandardItem *item2 = new QStandardItem();
item2->setIcon(QIcon(QPixmap::fromImage(qimages2)));
listItem << item2;
QStandardItem *item1 = new QStandardItem();
item1->setIcon(QIcon(QPixmap::fromImage(qimages1)));
listItem << item1;
model->appendColumn(listItem);
return model;
}
void MainWindow::ItemClicked (QModelIndex index )
{
textEdit->setText(index.data().toString());
}
I checked your code in QtCreator and it works as you described. So what is the problem? Are you getting some errors? Maybe did you not put declaration of ItemClicked(QModelIndex) below the public slots:? Are you sure that connect returns true? Try to check it:
bool success = connect(listviewmodel,SIGNAL(clicked(const QModelIndex)),this,SLOT(ItemClicked(QModelIndex)));
Q_ASSERT(success);
EDIT: If you want to display only icons at QListView and get some text informations after clicking on specified item, you can do it in the following way:
item2->setIcon(QIcon(QPixmap::fromImage(qimages2)));
item2->setData("informations about item2", Qt::UserRole);
(...)
void MainWindow::ItemClicked (QModelIndex index )
{
QString data = index.data(Qt::UserRole).value<QString>();
ui->textEdit->setText(data);
}
Related
I have a qtableview and Treeview in my program.
qtableview code is:
void MainWindow::tableShow(QString mystrings)
{
testModel = new QSqlTableModel(this);
testModel->setTable("parts");
if (mystrings=="")
{
testModel->setFilter("");
}
else
{
testModel->setFilter("type='"+mystrings+"'");
}
testModel->select();
ui->tableView->setModel(testModel);
}
it works just fine and the very interesting ability it has is you can edit cells and database updates automatically.
Now I have made a TreeView with this code:
void MainWindow::treeView2()
{
QStandardItemModel *myModel= new QStandardItemModel;
QStandardItem *item = new QStandardItem();
item = myModel->invisibleRootItem();
myQuery.exec("select groupName from maingroup");
while(myQuery.next()){
QString temp =(myQuery.value(0).toString());
QStandardItem *parItem= new QStandardItem(temp);
item->appendRow(parItem);
QSqlQuery childqry;
childqry.exec("select sub from subgroup where main = '"+temp+"'");
while(childqry.next()){
QStandardItem *childItem= new QStandardItem(childqry.value(0).toString());
parItem->appendRow(childItem);
}
}
ui->treeView->setModel(myModel);
ui->treeView->expandAll();
}
but editting item in this treeview do not updates the database and after restarting the program the item is like before. what should i do to automatically update database with new value that edited in treeview?
thanks in advance.
I was trying to select item "leaf2" from QComboBox with QTreeView in the below code.
I just want to select items with no child from text by code. (if there is a child, it won't be selectable)
How can I select item or index with no child item?
Can anyone help me with this problem?
Thank you.
void Main::initView()
{
QStandardItemModel *model = new QStandardItemModel;
QStandardItem *root_item = model->invisibleRootItem();
// Build Model Items
QStandardItem *node_item = NULL;
node_item = new QStandardItem("Node");
node_item->setFlags(Qt::ItemIsEnabled);
root_item->appendRow(node_item);
QStandardItem *leaf_item = new QStandardItem("leaf1");
leaf_item ->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable);
node_item->appendRow(leaf_item );
leaf_item = new QStandardItem("leaf2");
leaf_item ->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable);
node_item->appendRow(leaf_item );
// Set Model to TreeViewComboBox
ui.cb_treevew->setModel(model);
ui.cb_treeview->setCurrentIndex(0); // "Node" is selected.
ui.cb_treeview->setCurrentIndex(1); // Nothing is selected.
ui.cb_treeview->setCurrentIndex(2); // Nothing is selected.
ui.cb_treeview->setCurrentIndex(3); // Nothing is selected.
}
Here is my code for CTreeViewComboBox.
CTreeViewComboBox::CTreeViewComboBox(QWidget *parent) : QComboBox(parent)
{
QTreeView* treeView = new QTreeView(this);
treeView->setEditTriggers(QTreeView::NoEditTriggers);
treeView->setSelectionBehavior(QTreeView::SelectRows);
treeView->setSelectionMode(QTreeView::SingleSelection);
treeView->setItemsExpandable(true);
treeView->header()->setVisible(false);
treeView->setWordWrap(true);
setView(treeView);
}
PS: I tried to select items as following, but not working. :(
ui.cb_treeview->treeView()->setCurrentIndex(getModelIndexFromText("leaf2"));
If the nodes with children will never have the same text with the nodes without children then the following method is appropriate.
QModelIndexList modelIndexes = model->match(
model->index(0, 0),
Qt::DisplayRole,
"leaf2",
-1,
Qt::MatchRecursive);
QModelIndex index = modelIndexes.first();
ui.cb_treeview.setRootModelIndex(index.parent());
ui.cb_treeview.setCurrentIndex(index.row());
On the other hand, if the nodes with children can have the same text as the nodes without children, you should use the following method.
QModelIndexList modelIndexes = model->match(
model->index(0, 0),
Qt::DisplayRole,
"leaf2",
-1,
Qt::MatchRecursive);
QModelIndexList::iterator tstIt = std::find_if(modelIndexes.begin(),
modelIndexes.end(),
[] (const QModelIndex & index) {
return !index.model()->hasChildren(index);
});
ui.cb_treeview.setRootModelIndex(tstIt->parent());
ui.cb_treeview.setCurrentIndex(tstIt->row());
In both cases I am assuming that nodes without children always have different texts. If nodes without children match the name, choose one of them.
I'm making a Qt5.7 application where I am populating a QListView after reading stuff from a file. Here's the exact code of it.
QStringListModel *model;
model = new QStringListModel(this);
model->setStringList(stringList); //stringList has a list of strings
ui->listView->setModel(model);
ui->listView->setEditTriggers(QAbstractItemView::NoEditTriggers); //To disable editing
Now this displays the list just fine in a QListView that I have set up. What I need to do now is to get the string that has been double clicked and use that value elsewhere. How do I achieve that?
What I tried doing was to attach a listener to the QListView this way
... // the rest of the code
connect(ui->listView, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(fetch()));
...
And then I have the function fetch
void Window::fetch () {
qDebug() << "Something was clicked!";
QObject *s = sender();
qDebug() << s->objectName();
}
However the objectName() function returns "listView" and not the listView item or the index.
The signal already provides you with a QModelIndex which was clicked.
So you should change your slot to this:
void Window::fetch (QModelIndex index)
{
....
QModelIndex has now a column and a row property. Because a list has no columns you are interessted in the row. This is the index of the item clicked.
//get model and cast to QStringListModel
QStringListModel* listModel= qobject_cast<QStringListModel*>(ui->listView->model());
//get value at row()
QString value = listModel->stringList().at(index.row());
You should add the index as parameter of your slot. You can use that index to access the list
Your code should be some thing like this.
void Window::fetch (QModelIndex index) {
/* Do some thing you want to do*/
}
I generate checkboxes as follows:
foreach(QString filt, types){
QCheckBox *checkbox = new QCheckBox(filt, this);
checkbox->setChecked(true);
vbox->addWidget(checkbox);
}
I need to get access to these checkboxes by name but they are all called the same?
I need to read the text they display.
How can I go about this?
Is it possible to run a for loop and attach the value of i onto the end of the checkbox. So in effect, the checkbox would be called checkbox[0], checkbox [1], etc?
EDIT:
I've changed the code to the following:
for(int i=0; i<types.count(); ++i)
{
QString filt = types[i];
*checkboxCount = *checkboxCount + 1;
QCheckBox *typecheckbox[i] = new QCheckBox(filt, this);
typecheckbox[i]->setChecked(true);
vbox->addWidget(typecheckbox[i]);
}
I thought this was a way to dynamically name the checkboxes so I can loop through them to get the text value from them.
I'm getting the error 'variable-sized object may not be initialized' on this line QCheckBox *typecheckbox[i] = new QCheckBox(filt, this);
Any ideas to a solution/ alternate approach?
If you want to access the checkboxes later, you can just use the find children method as follows:
QStringList myStringList;
QList<QCheckBox *> list = vbox->findChildren<QCheckBox *>();
foreach (QCheckBox *checkBox, list) {
if (checkBox->isChecked())
myStringList.append(checkBox->text());
}
After reading some examples I am still missing here something.
I have Qtreeview for view and QStandardItemModel for the data interface, also using QSortFilterProxyModel subclass but I don't know if its relevant.
This is my logic:
First I create the model with the QWidget as the parent:
QStandardItemModel m_model = new QStandardItemModel(0,4,parent);
then setSourceModel(m_model) for the widget
Set the treeview with QSortFilterProxyModel. something like this:
GroupProxyModel = new GroupSortFilterProxyModel;
GroupProxyModel->setDynamicSortFilter(true);
setSourceModel(createSubjectModel(parent));
ui.treeView_mainwindow->setModel(GroupProxyModel);
ui.treeView_mainwindow->setSortingEnabled(true);
Then later I fill the first row like this:
QList<QStandardItem *> items;
items.insert(0,new QStandardItem("Test 0"));
items.at(0)->setEditable(false);
m_model->insertRow(0,items);
Until now every thing working fine and I see the row with the data. But when I like to
add child to the row like this:
QModelIndex parentQModelIndex = m_model->item(0,0)->index();
m_model->insertRows(0,1,parentQModelIndex);
m_model->insertColumns(0,1,parentQModelIndex);
QModelIndex indexB = m_model->index(0, 0, parentQModelIndex);
m_model->setData(indexB,"Child test",Qt::DisplayRole);
But I don't see the child, why?
That's not how QStandardItemModel works - to add a child, call appendRow(s)/insertRow(s) on the parent QStandardItem:
QStandardItem* child = new QStandardItem( tr("Child test") );
...
QStandardItem* parentItem = m_model->item( 0, 0 );
parentItem->appendRow( child );