I create A list widget in which I add items...my items are the filenames. Is any way to store the filepaths of this filenames? I want to know how to set a specific value to an item in the listwidget?
You can use:
ListWidgetItem::setData(int role,Qvariant data);
to store your filePath;
like this:
QString fileName = "hello.txt";
QString filePath = "/home/user/hello.txt";
//Adding to listWidget
QListWidgetItem *item =new QListWidgetItem();
item->setText(fileName);
item->setData(1,filePath);//here role is set as 1
listWidget->addItem(item);
//For taking back that filePath
QString filePath = listWidget->currentItem()->data(1); //note::: role equals 1
Related
I am trying to get listview and tableview working together.
The listview must be used for display, the tableview must be used for editing data. The tableview is created on demand in a popup widget (and it may never be needed).
I populate the listview, on start, from a text file - each row a line, with 2 entries separated by a tab. Easy.
The tableview will have to edit 2 columns separately... also, on listview click, I must be able to retrieve the first part of the split...
I have created a model subclass of QStringListModel.
QListView *m_myView = new QListView();
StringList *m_myList = new StringList();
QTextStream in(&myFile);
while (!in.atEnd())
{
QString temp = in.readLine();
if(!temp.isEmpty())
m_myList->append(temp);
}
myFile.close();
m_myView->setModel(m_myList);
where
class StringList : public QStringListModel
{
public:
void append (const QString& string)
{
insertRows(rowCount(), 1);
QModelIndex m = index(rowCount() - 1);
setData(m, string, Qt::EditRole);
QStringList splist = string.split('\t');
setData(m, splist.at(0), Qt::ToolTipRole);
if(splist.size() > 1)
setData(m, splist.at(1), Qt::StatusTipRole);
else
setData(m, "", Qt::StatusTipRole);
qDebug() << data(m, Qt::EditRole).toString()
<< data(m, Qt::ToolTipRole).toString()
<< data(m, Qt::StatusTipRole).toString();
}
};
The EditRole displays correctly, the others display empty strings.
It seems that QStringListModel is incapable of storing anything except EditRole.
So I am left with 2 options - either do the split on each selection, and also when creating the table view, or - what I would like to try but don't know how - create a QStandardItemModel that can act as data sources for both the listview and the tableview, and can easily retrieve the partial data I require on click.
I thought I can simply use it to set the data on listview (like they do here).
QListView *m_myView = new QListView();
QStandardItemModel *m_myList = new QStandardItemModel();
QTextStream in(&myFile);
int r = 0;
while (!in.atEnd())
{
QString temp = in.readLine();
if(!temp.isEmpty())
{
QStringList splist = temp.split('\t'); // assume I know there will be 2 strings always
QStandardItem *item = new QStandardItem(splist.at(0));
m_myList->setItem(r, 0, item);
QStandardItem *item1 = new QStandardItem(splist.at(1));
m_myList->setItem(r, 1, item1);
++r;
}
}
myFile.close();
m_myView->setModel(m_myList);
connect(m_myListView, SIGNAL(clicked(QModelIndex)),
this, SLOT(listChangedSlot(QModelIndex)));
But this will only set the first string in the listview, I really need both, and I still don't know how to retrieve the data
void listChangedSlot(QModelIndex index)
{
qDebug() << m_myList->item(index.row(), 0)->data().toString()
<< m_myList->item(index.row(), 1)->data().toString();
} // shows empty strings
Or...
In the loading section, try:
if(!temp.isEmpty())
{
QStringList splist = temp.split('\t');
splist.append(QString()); // so I don't need to test
QStandardItem *item = new QStandardItem(temp);
m_myList->setItem(r, 0, item);
QModelIndex idx = m_myList->index(r, 0);
QMap<int, QVariant> roles;
roles.insert(Qt::UserRole + 1, QVariant(splist.at(0)));
roles.insert(Qt::UserRole + 2, QVariant(splist.at(1)));
roles.insert(Qt::DisplayRole, QVariant(temp));
m_myList->setItemData(idx, roles);
++r;
}
This works - displays fine and gets the correct content on click - but seems to be unusable for the tableview.
(And seems I am doing twice the work, with setItem and setItemData - so technically storing the content 3 times).
How can I get my listview have a datasource with 2 string items, show both, be able to set it on a tableview, and be able to retrieve the first item on click ?
I figured out a way to share the data source between the listview and tableview:
I create 3 columns - column 0 with the combined components, and columns 1 and 2 with the separated components.
The listview will display only column 0. For tableview, I will hide column 0.
The data I require for processing will be stored in columns 1 and 2. user edit of the data in tableview will require, upon accepting changes, the edit of corresponding column 0.
I have a QMenu, where I want to add QActions. The problem is, everytime the table is clicked, the existing menu adds onto itself. How do I stop it from doing that?
So when I click on the table, it should be new menus everytime.
void MainWindow::onTableClicked(const QModelIndex &index){
QAction *action;
// action->setAutoRepeat(false);
if (index.isValid()) {
QString cellText = index.data().toString();
QString indexRow = QString::number(index.row());
QString indexCol = QString::number(index.column());
ui->textBrowser->setText(indexRow + "\n"+ indexCol);
QSet<int> possiblevalues = findPossibleValues(index.row(),index.column());
for(int n : possiblevalues){
listofPossibleValues.push_back(QString::number(n));
}
for(auto s :listofPossibleValues){
action = myMenu.addAction("Set Value "+s);
}
}
}
The reason why it looked like myMenu.clear wasnt working was because i did not remove listofPossibleValues after I added the menuaction. I was able to fix it by adding
//At the beginning
myMenu.clear();
//At the end
listofPossibleValues.clear();
I am writing data to a config file using the following code.
QSettings settings("/root/configFile.ini",QSettings::IniFormat);
QString userName = lineEditUsername.text();
QString password = lineEditPassword.text();
QList<QString> listUsername;
QList<QString> listPassword;
settings.beginWriteArray("UserData");
for(i=0;i<listUsername.size();i++)
{
Qstring user = listUsername.at(i);
Qstring pass = listPassword.at(i);
settings.setArryIndex(i);
settings.setValue("Username",user);
settings.setValue("Password",pass);
}
settings.endArray();
}
Now when I run the code first time and give 4 or 5 values they are formed in proper order in the file. However if I run the application for second time the values start overwriting from first position. Can some one suggest me some solution for this?
Instead of creating and maintaining arrays and indexes, I would propose to create user credentials map and store it in the settings file as follows:
QSettings settings("/root/configFile.ini", QSettings::IniFormat);
QString userName = lineEditUsername.text();
QString password = lineEditPassword.text();
QList<QString> listUsername;
QList<QString> listPassword;
//settings.beginWriteArray("UserData");
QVariantMap userDataMapping;
for(int i = 0; i < listUsername.size() ; i++)
{
QString user = listUsername.at(i);
QString pass = listPassword.at(i);
userDataMapping[user] = pass;
//settings.setArryIndex(i);
//settings.setValue("Username",user);
//settings.setValue("Password",pass);
}
// Store the mapping.
settings.setValue("UserData", userDataMapping);
//settings.endArray();
// ...
This will store your data in ini file in the following format:
UserData=#Variant(\0\0\0\b\0\0\0\x1\0\0\0\x6\0\x64\0\x64\0\x64\0\0\0\n\0\0\0\x6\0\x62\0\x62\0\x62)
When you read settings, do something like this:
[..]
QVariant v = settings.value("UserData");
QVariantMap map = v.value<QVariantMap>();
QMapIterator<QString, QVariant> i(map);
while (i.hasNext()) {
i.next();
QString user = i.key();
QString pass = i.value().toString();
}
You need to retrieve the amount of existing entries before adding a new one. Something like this:
int size = settings.beginReadArray( "UserData" );
settings.endArray();
settings.beginWriteArray( "UserData" );
settings.setArrayIndex( size ); // Note: Maybe 'size - 1', not sure
// ...
settings.endArray();
setArrayIndex( size ) will move the array index to the end and will thus no longer override an existing entry
I'm trying to fill a QTableWidget from a file that was exported by my program, but when I try to set text to the table cells they just ignore me, nothing happens.
void MainWindow::on_actionOpen_Project_triggered()
{
QString line, fileName;
fileName = QFileDialog::getOpenFileName(this,tr("Open Project"), "", tr("Project Files (*.project)"));
if(!fileName.isEmpty()){
QFile file(fileName);
if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) return;
QTextStream in(&file);
for(int i=0;i<ui->code->rowCount();i++){ // goes through table rows
for(int j=0;j<ui->code->columnCount();j++){ // through table columns
ui->code->setCurrentCell(i,j);
QTableWidgetItem *cell = ui->code->currentItem();
in >> line;
if(!line.isEmpty()){
cell = new QTableWidgetItem(line); // relates the pointer to a new object, because the table is empty.
ui->errorlog->append(line); // just for checking if the string is correct visually.
}
}
}
file.close();
}
}
The errorlog object shows on the screen the correct values opened from the file, however the table is not filled. Any problems found?
This line:
cell = new QTableWidgetItem(line);
doesn't do what you think it does. Assigning the cell doesn't change anything in the table – cell is just a local variable, overwriting it doesn't have any effect elsewhere.
You (probably) want to do something like this instead:
cell->setText(line);
Or (if you don't really need to change the current item):
ui->code->item(i,j)->setText(line);
If those give you a segfault, it's that you haven't set the table's widget items yet. In that case, you should do something like:
QTableWidgetItem *cell = ui->code->item(i,j);
if (!cell) {
cell = new QTableWidgetItem;
ui->code->setItem(i,j,cell);
}
if (!line.isEmpty()) {
cell->setText(line);
}
This will populate all the cells with QTableWidgetItems the first time this function is called, and reuse them subsequently.
How can I get the texts of all the widgets in a QListWidget as a QList<QString>?
I can get the list of widget items like this:
QList<QListWidgetItem *> items =
ui->listWidget->findItems(QString("*"), Qt::MatchWrap | Qt::MatchWildcard);
But that's not exactly what I want, I'd like the list of the widget text() properties.
There is no built-in function for that, you'll need to do it manually.
QList<QString> texts;
foreach(QListWidgetItem *item, items)
texts.append(item->text());
Or something like that.
int c = ui->listWidget->count();
for (int i = 0; i < c ; ++i){
QString s = QString::number(i);
QModelIndex *model_index = new QModelIndex(ui->listWidget->model()->index(i,0) ); //0th column since we have one cloumn in listwidget
QString q= model_index->data(Qt::DisplayRole).toString();
qDebug()<<q;
}