struct AppsData {
QList<QIcon> icons;
QStringList name;
QStringList version;
QStringList publisher;
QStringList installLocation;
QStringList uninstallLocation;
};
void Test::setAppData(QList<QIcon> icons, QStringList names, QStringList versions, QStringList publishers, QStringList installLocations, QStringList uninstallLocations)
{
AppsData appsData;
appsData.icons = icons;
appsData.name = names;
appsData.version = versions;
appsData.publisher = publishers;
appsData.installLocation = installLocations;
appsData.uninstallLocation = uninstallLocations;
QVector<AppsData> dataVector;
dataVector.push_back(appsData);
}
I want to display all apps data in appropriate columns.
Image:
Also I have tried to accomplish it without vectors:
for (int i = 0; i < uninstallLocations.count(); i++) {
allApplicationsItem = new QTreeWidgetItem(allApplications);
allApplicationsItem->setText(0, names.at(i));
allApplicationsItem->setText(1, versions.at(i));
allApplicationsItem->setText(2, publishers.at(i));
allApplicationsItem->setText(3, installLocations.at(i));
allApplicationsItem->setText(4, uninstallLocations.at(i));
}
but it doesn't work, the application crashes.
Assuming you are using Qt5:
Once you have a QTreeWidget and the vector created, you should iterate over its elements, and create a new QTreeWidgetItem for each one, so you'd have something like:
QTreeWidget *treeWidget = new QTreeWidget(this);
treeWidget->setCoulmnCount(1);
for(int i = 0; i < vector.count(); i++) {
QTreeWidgetItem *newItem = new QTreeWidgetItem(treeWidget);
newItem->setText(0, vector.value(i)); // 0 to display it at column 0
}
As you can see, first you need to create the QTreeWidget and then add each child as a QTreeWidgetItem to it.
By the way, you should consider changing the name of the variable vector to something more specific.
Related
I want to create an editable QComboBox which filters results according to the search query and updates the dropdown entries accordingly.
After reading How do I Filter the PyQt QCombobox Items based on the text input? I tried to implement something similar in C++.
But I can't store anything inside the QComboBox now. Even after adding new entries through addItem() the total count remains 0.
What is the reason for this and how do I insert entries inside the QComboBox with QSortFilterProxyModel?
Here is the relevant snippet of the code:
SearchBox = new QComboBox(this);
SearchBox->setEditable(true);
// Try adding a few entries and check if they persist after changing the model
SearchBox->addItem(QString("hi"));
SearchBox->addItem(QString("bye"));
int count = SearchBox->count(); // count = 2
ProxyModel = new QSortFilterProxyModel;
ProxyModel->setSourceModel(SearchBox->model());
ProxyModel->setFilterCaseSensitivity(Qt::CaseSensitivity::CaseInsensitive);
SearchBox->setModel(ProxyModel);
// Check count again
count = SearchBox->count(); // count = 0 <- Why?
// Try adding new entries
SearchBox->addItem(QString("Hi again"));
count = SearchBox->count(); // count = 0 .. So new entries don't get stored
Completer = new QCompleter(ProxyModel,this);
Completer->setCompletionMode(QCompleter::UnfilteredPopupCompletion);
SearchBox->setCompleter(Completer);
QObject::connect(SearchBox->lineEdit(), SIGNAL(textChanged(const QString)), ProxyModel, SLOT(setFilterFixedString(const QString)));
QObject::connect(Completer, SIGNAL(activated(const QString &)), this, SLOT(onCompleterActivated(const QString &)));
Use QStringListModel to store items. Application crashes if proxy model have no items (if filter string filters out all items)(this needs further investigation - is this completer issue or combobox). This can be fixed by not applying such filter (onTextChanged(QString text) slot). Completer completes input if theres only one item (not sure if it's ok). And sometimes checkbox doubles all items (don't know why). If this issues is critical, I think you need to write custom ComboBox from scratch and this is serious work.
{
SearchBox = new QComboBox(this);
SearchBox->setEditable(true);
QStringList Items;
Items << "hi" << "bye";
StringListModel = new QStringListModel();
StringListModel->setStringList(Items);
ProxyModel = new QSortFilterProxyModel;
ProxyModel->setSourceModel(StringListModel);
ProxyModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
SearchBox->setModel(ProxyModel);
// Check count again
int count = SearchBox->count(); // count = 2
// Try adding new entries
QStringList Items_ = StringListModel->stringList();
Items_ << "hi again";
StringListModel->setStringList(Items_);
count = SearchBox->count(); // count = 3
Completer = new QCompleter(ProxyModel,this);
Completer->setCompletionMode(QCompleter::UnfilteredPopupCompletion);
SearchBox->setCompleter(Completer);
QObject::connect(SearchBox->lineEdit(), SIGNAL(textChanged(const QString)), this, SLOT(onTextChanged(QString)));
QObject::connect(Completer, SIGNAL(activated(const QString &)), this, SLOT(onCompleterActivated(const QString &)));
}
void MainWindow::onTextChanged(QString Text) {
QStringList Items = StringListModel->stringList();
QString Item;
foreach(Item,Items) {
if (Item.indexOf(Text) > -1) {
ProxyModel->setFilterFixedString(Text);
return;
}
}
}
I have derived the class QTreeWidget and creating my own QtPropertyTree. In order to populate the tree with widgets (check boxes, buttons, etc) I am using the following code:
// in QtPropertyTree.cpp
QTreeWidgetItem topItem1 = new QTreeWidgetItem(this);
QTreeWidgetItem subItem = new QTreeWidgetItem(this);
int column1 = 0
int Column2 = 1;
QPushButton myButton = new QPushButton();
this->setIndexWidget(this->indexFromItem(this->subItem,column1), myButton);
QCheckBox myBox = new QCheckBox();
this->setIndexWidget(this->indexFromItem(this->subItem,column2), myBox);
This works fine, but the problem is that i want to avoid using the "indexFromItem" function since it is protected, and there are other classes that are populating the tree and need access to that funcion. Do you know any alternative to using that function?
You can try to use your QTreeWidget's model (QAbstractItemModel) to get the right index by the column and row numbers:
// Row value is 1 because I want to take the index of
// the second top level item in the tree.
const int row = 1;
[..]
QPushButton myButton = new QPushButton();
QModelIndex idx1 = this->model()->index(row, column1);
this->setIndexWidget(idx1, myButton);
QCheckBox myBox = new QCheckBox();
QModelIndex idx2 = this->model()->index(row, column2);
this->setIndexWidget(this->indexFromItem(idx2, myBox);
UPDATE
For sub items, the same approach can be used.
QModelIndex parentIdx = this->model()->index(row, column1);
// Get the index of the first child item of the second top level item.
QModelIndex childIdx = this->model()->index(0, column1, parentIdx);
The obvious solution is to de-protect indexFromItem like this:
class QtPropertyTree {
...
public:
QModelIndex publicIndexFromItem(QTreeWidgetItem * item, int column = 0) const
return indexFromItem (item, column) ;
}
} ;
i have a qtreewidget with toplevelitems. each toplevelitem has 4 childeren, each child has special value, first child of all toplevelitems is its parrent cost, i want to sort this toplevelitems base on this cost, but i don't know how to do this? my idea is to keep this toplevelitems and their cost in a map and add and take them each time a toplevelitem is added, but i'm looking for a better way.
thanks in advance.
By default, tree widget sorts items according to their texts, however you can change it by overriding the operator<() of the QTreeWidgetItem. Below is the example of custom QTreeWidgetItem with specific operator (see comments):
class TreeWidgetItem : public QTreeWidgetItem
{
public:
// The constructors. Add more, if needed.
TreeWidgetItem(QTreeWidget *parent, const QStringList &strings,
int type = Type)
: QTreeWidgetItem(parent, strings, type)
{}
TreeWidgetItem(QTreeWidgetItem *parent, const QStringList &strings,
int type = Type)
: QTreeWidgetItem(parent, strings, type)
{}
// Compares two tree widget items. The logic can be changed.
bool operator<(const QTreeWidgetItem& other) const
{
// Get the price - the first child node
int price1 = 0;
if (childCount() > 0)
{
QTreeWidgetItem *firstChild = child(0);
price1 = firstChild->text(0).toInt();
}
// Get the second price - the first child node
int price2 = 0;
if (other.childCount() > 0)
{
QTreeWidgetItem *firstChild = other.child(0);
price2 = firstChild->text(0).toInt();
}
// Compare two prices.
return price1 < price2;
}
};
And here is how this class can be used with QTreeWidget:
// The sortable tree widget.
QTreeWidget tw;
tw.setSortingEnabled(true);
QTreeWidgetItem *item1 = new TreeWidgetItem(&tw, QStringList() << "Item1");
QTreeWidgetItem *child1 = new TreeWidgetItem(item1, QStringList() << "10");
QTreeWidgetItem *item2 = new TreeWidgetItem(&tw, QStringList() << "Item2");
QTreeWidgetItem *child2 = new TreeWidgetItem(item2, QStringList() << "11");
tw.show();
How can I implement this code I have for a qTreeWidget for a qTreeView?
for (const auto & i : names) {
QTreeWidgetItem * item = new QTreeWidgetItem(ui->treeWidget);
item->setText(0, QString::fromStdString(i));
ui->treeWidget->addTopLevelItem(item);
const std::unordered_map<std::string, double> map = m_reader.getMapFromEntry(i);
for (const auto & j : map) {
QTreeWidgetItem * item2 = new QTreeWidgetItem();
item2->setText(0,QString::fromStdString(j.first));
item2->setText(1,QString::number(j.second));
item->addChild(item2);
}
}
I have a model and a treeView, like this:
m_model = new QStandardItemModel(m_reader.getAllNames().size(),2,this);
ui->treeView->setModel(m_model);
I tried this, but that only shows one column:
QStandardItem * parentItem = m_model->invisibleRootItem();
for (const auto & i : names) {
QStandardItem * item = new QStandardItem(QString::fromStdString(i));
parentItem->appendRow(item);
const std::unordered_map<std::string, double> map = m_reader.getMapFromEntry(i);
for (const auto & j : map) {
QList<QStandardItem *> rowItems;
rowItems << new QStandardItem(QString::fromStdString(j.first));
rowItems << new QStandardItem(QString::number(j.second));
item->appendRow(rowItems);
}
}
With the treeWidget, I had so set the columnCount, like this:
ui->treeWidget->setColumnCount(2);
But treeView does not have a method like this.
So, to summarize: How can I implement a TreeView with more than one column?
EDIT:
To clarify, I want something like this:
|-A
| |-B-C
| |-D-E
where A is the parent and B,C,D,E the children, with B,D being in column 0 and C,E in column 1.
Hope this helps!
To support multiple columns, the model must contain data for multiple columns.
So in some sense, columns are a property of the model, not the view. Views then can decide to hide or rearrange certain columns (For example, a QListView always only shows the first column, while one can hide or reorder columns in a QTableView).
As you use QStandardItemModel, its documentation should give a few hints how to create multiple columns.
E.g., look at this example from the documentation:
QStandardItemModel model(4, 4);
for (int row = 0; row < 4; ++row) {
for (int column = 0; column < 4; ++column) {
QStandardItem *item = new QStandardItem(QString("row %0, column %1").arg(row).arg(column));
model.setItem(row, column, item);
}
}
It creates a model with 4 initial rows and columns each, and then fills it with items via setItem().
Alternatively, you can pass a list of items to QStandardItemModel::appendRow(), with an item for each column:
QList<QStandardItem*> items;
items.append(new QStandardItem(tr("One"));
items.append(new QStandardItem(tr("Two"));
model->appendRow(items);
This adds a new row with "One' in the first column and "Two" in the second. For even more ways to deal with multiple columns, see the QStandardItemModel docs.
Note: QTreeView expects the same number of columns on all levels of the hierarchy, so one should fill rows with empty items for the unused columns if need be.
Just an addition to answer by Frank Osterfeld:
QTreeView displays all columns of subtables inserted into top level QStandardItems. You just have to "force" it to show additional columns by inserting dummy QStandardItems into top-level table. Example:
QStandardItemModel *objectTreeModel = new QStandardItemModel(NULL);
QStandardItem *mainItem = new QStandardItem(tr("Main Item"));
QStandardItem *subItem1 = new QStandardItem(tr("Sub-Item 1"));
QStandardItem *subItem2 = new QStandardItem(tr("Sub-Item 2"));
mainItem->appendRow(QList<QStandardItem *>() << subItem1 << subItem2);
QStandardItem *dummyItem = new QStandardItem();
objectTreeModel->appendRow(QList<QStandardItem *>() << mainItem << dummyItem );
Now you will be able to see 2 columns and if you expand mainItem, both subitems will be visible.
I want to hide the ID column in the QtableView and i can't do that on my implementation. Can anyone help me?
void MainWindow::on_actionClear_Search_triggered()
{
model = new QStandardItemModel(cars.size(),6,this);
//create header
createHeader(model);
//set data to the table view
populate(cars);
ui->tableView->setColumnHidden(6,true);
ui->tableView->setModel(model);
}
void MainWindow::createHeader(QStandardItemModel *model){
model->setHorizontalHeaderItem(0,new QStandardItem("Car"));
model->setHorizontalHeaderItem(1, new QStandardItem("Type"));
model->setHorizontalHeaderItem(2, new QStandardItem("Mileage"));
model->setHorizontalHeaderItem(3, new QStandardItem("Year"));
model->setHorizontalHeaderItem(4, new QStandardItem("Is registered"));
model->setHorizontalHeaderItem(5, new QStandardItem("ID"));
}
void MainWindow::populate(const QList<Vehicle> &vehicles)
{
int j = 0;
QList<Vehicle>::ConstIterator iter;
for( iter= vehicles.begin(); iter != vehicles.end(); iter++){
const Vehicle& car = *iter;
//set car
QString makeAndModel = car.getGeneralData().getMake() + car.getGeneralData().getModel();
QStandardItem *mAndM = new QStandardItem(QString(makeAndModel));
mAndM->setEditable(false);
model->setItem(j,0,mAndM);
//set type
QStandardItem *type = new QStandardItem(QString(car.getGeneralData().getType()));
type->setEditable(false);
model->setItem(j,1,type);
//set mileage
QString mileageString = QString::number(car.getGeneralData().getMileage());
QStandardItem *mileage = new QStandardItem(QString(mileageString));
mileage->setEditable(false);
model->setItem(j,2,mileage);
//set year
QString yearString = QString::number(car.getGeneralData().getYear());
QStandardItem *year = new QStandardItem(QString(yearString));
year->setEditable(false);
model->setItem(j,3,year);
//set registration
QString regString = VehicleHelper::convertBoolToString(car.getRegistration().isRegistered());
QStandardItem *regDate = new QStandardItem(QString(regString));
regDate->setEditable(false);
model->setItem(j,4,regDate);
//set ID column
QStandardItem *idNumber = new QStandardItem(QString(car.getVehicleID().getID()));
idNumber->setEditable(false);
model->setItem(j,5,idNumber);
j++;
}
}
You use ui->tableView->setColumnHidden(6, true);, but there is no column with index 6. You should write ui->tableView->setColumnHidden(5, true); instead, because ID column number is rather 5 than 6.
UPDATE:
You also need to hide column(s) after you set the model to the view, i.e:
ui->tableView->setModel(model);
ui->tableView->setColumnHidden(5, true);
Another approach is set specified column's width to zero : ui->tableView->setColumnWidth(col,0); ui->tableWidget->setColumnWidth(col,0);.
Ui->tableView->horizontalHeader()->hideSection(col);
where col - number of table column