I am using stackedwidget and for some reason i cannot be able to update a view.I used this to get to my first view
(manage_employee_data).
connect(ui.actionManage_Employees_Data, SIGNAL(triggered()), this, SLOT(manage_employee_data()));
Here is the code i am using to update the view.
void employed::manage_employee_data()
{
tablesModel = new QSqlTableModel(ui.empds_tableview);
tablesModel->setEditStrategy(QSqlTableModel::OnManualSubmit);
tablesModel->setTable("employee_datastores");
ui.empds_tableview->setModel(tablesModel);
ui.empds_tableview->setColumnHidden(tablesModel->fieldIndex("id"), true);
ui.empds_tableview->setColumnHidden(tablesModel->fieldIndex("employee_datastore_description"), true);
ui.empds_tableview->setEditTriggers(QAbstractItemView::NoEditTriggers);
ui.empds_tableview->setSelectionMode(QAbstractItemView::SingleSelection);
ui.empds_tableview->setSortingEnabled(true);
ui.empds_tableview->setSelectionBehavior(QAbstractItemView::SelectRows);
ui.empds_tableview->horizontalHeader()->setStretchLastSection(true);
tablesModel->select();
//Localized Header Captions
tablesModel->setHeaderData(1, Qt::Horizontal, tr("Employee DataStore Name"));
connect(ui.empds_tableview->selectionModel(),
SIGNAL(currentRowChanged(const QModelIndex&,
const QModelIndex&)),
this, SLOT(updateView()));
ui.stackedWidget->setCurrentWidget(ui.page_10);
}
void employed::updateView()
{
QMessageBox msgBox;
msgBox.setText("Manage Employee Data Sent Me.");
msgBox.exec();
}
I just added ui.stackedWidget->setCurrentWidget(ui.page_10); to my update function.
void employed::updateView()
{
QMessageBox msgBox;
msgBox.setText("Manage Employee Data Sent Me.");
msgBox.exec();
ui.stackedWidget->setCurrentWidget(ui.page_10);
}
Related
This is how i am currently choosing the font in my application.
void FontChange()
{
QString filePath = QFileDialog::getOpenFileName(NULL, tr("Open File"),
QStandardPaths::standardLocations(QStandardPaths::FontsLocation)[0],
tr("Fonts (*.ttf);;Everything (*.*)"), nullptr,
QFileDialog::DontUseNativeDialog);
if (filePath.isEmpty())
return;
QlineEditSetFont->setText(filePath);
stdstrLocation = filePath.toStdString();
this->isChanged = true; // this executes the function
}
I want to execute a function whenever i change my selection in the Dialog , currently i have to choose a font and than click on open to execute the function
////////////////////////////////////////////////////////////////////////////
Now i am using a non modal way but how can i determine if cancel has been pressed.
Further Edit
QFileDialog* dialog = new QFileDialog();
dialog->setAttribute(Qt::WA_DeleteOnClose);
dialog->setNameFilter("TTF (*.ttf)");
dialog->setOption(QFileDialog::DontUseNativeDialog);
dialog->setDirectory("C:\\Windows\\Fonts");
QObject::connect(dialog, &QFileDialog::currentChanged, [=](const QString &path) {
qDebug() << path; stdstrLocation = path.toStdString(); this->isChanged = true;
QStringList fileNames = dialog->selectedFiles();
qDebug() << "Selected FIles" << fileNames.size();
});
dialog->show();
You can't use the static convenience method but need to create the QFileDialog instance manually:
auto dialog = new QFileDialog(someParent);
dialog->setWindowTitle(tr("Open File"));
dialog->setDirectory(QStandardPaths::standardLocations(QStandardPaths::FontsLocation)[0]);
dialog->setNameFilter(tr("Fonts (*.ttf);;Everything (*.*)"));
// more setup...
connect(dialog, &QFileDialog::filesSelected, this, [this](const QStringList &selected) {
// handle selection change here
});
if (dialog->exec() == QDialog::Accepted) { // alternatively use open() to avoid blocking exec()
// do something with dialog->selectedFiles()...
}
delete dialog;
Actually, those are two different questions. The one from the title has been already answered. The answer to the second one, namely How can i determine if cancel has been pressed, lies in the documentation of QFileDialog::getOpenFileName itself:
If the user presses Cancel, it returns a null string.
With this in mind, you can do something like:
void FontChange()
{
QString filePath = QFileDialog::getOpenFileName(NULL, tr("Open File"),
QStandardPaths::standardLocations(QStandardPaths::FontsLocation)[0],
tr("Fonts (*.ttf);;Everything (*.*)"), nullptr,
QFileDialog::DontUseNativeDialog);
if (filePath.isNull()) {
// user pressed Cancel
} else if (filePath.isEmpty()) {
return;
} else {
QlineEditSetFont->setText(filePath);
stdstrLocation = filePath.toStdString();
this->isChanged = true; // this executes the function
}
}
You can of course rewrite the if part to be more suitable to your app's logic.
As a side note, QString::isEmpty also implies that it is NULL.
I have a treeWidget in which I need to remove the QTreeWidgetItem's childelement.
QTreeWidgetItem *listing = new (ui->treeWidget);
AddChild(listing,id);
AddChild(listing,id);`// this is what i need to delete
AddChild(listing,id);
listing->takeChild(1);
I tried func takeChild(int index) but nothing happend
void AddChild(QTreeWidget *s,int id)
{
QTreeWidgetItem *_s = new QTreeWidgetItem(ui->treeWidget);
_s->setText(0,QString::number(id));
s->addChild(_s);
}
There are errors in your code,
QTreeWidgetItem *listing = new (ui->treeWidget);
should be:
QTreeWidgetItem *listing = new QTreeWidgetItem(ui->treeWidget);
and the signature of AddChild() functions is wrong:
void AddChild(QTreeWidget *s,int id)
should be:
AddChild(QTreeWidgetItem *s,int id)
Now the main issue why takeChild() is not working for you, is that you are not adding the items as children to listing , but you are adding them to the treeWidget, thus in your AddChild(), you should set the parent to S which is listing, So your code should be:
QTreeWidgetItem *listing = new QTreeWidgetItem(ui->treeWidget);
listing->setText(0, tr("Listing"));
AddChild(listing,0);
AddChild(listing,1); // this is what i need to delete
AddChild(listing,2);
listing->takeChild(1);
and the function AddChild()
void AddChild(QTreeWidgetItem *s,int id)
{
QTreeWidgetItem *_s = new QTreeWidgetItem(s);
_s->setText(0,QString::number(id));
s->addChild(_s);
}
I've made an app with two forms.
When I press the save button in the second form, it updates the DB Record, and returns back to the first form. I've connected the two forms via Signal-Slot with this code:
DruckerData.h
signals:
void btnSavePressed(QString printerName);
DruckerData.cpp
UiMainWindow frmMain;
connect(this,SIGNAL(btnSavePressed(QString)),&frmMain,SLOT(refreshSaved( QString )));
emit btnSavePressed(ui->ledit_druckerName->text());
this->hide();
UiMainWindow.h
public slots:
void refreshSaved(QString printerName);
UiMainWindow.cpp
void UiMainWindow::refreshSaved(QString printerName){
qDebug()<<"Updated: "<<printerName;
show_list(); //<<<<<<<<<<<<<<<<<<<<<< this function
}
show_list
void UiMainWindow::show_list (){
QList<DB_Printers_lvs> list;
DB_Printers_lvsTransporter t("LVS");
QString wc;
this->setCursor(Qt::WaitCursor);
wc = QString("where 1=1 order by nam_printer");
if (!t.load_dbPrinters_lvs_wc(&list,wc))
{
log()<< "get printers failed"<< wc << t.getLastError();
this->setCursor(Qt::ArrowCursor);
return;
}
ui.treeWidget->clear();
foreach (DB_Printers_lvs db, list)
{
QTreeWidgetItem *item = new QTreeWidgetItem(0);
printer_to_qtreewidgetitem(item, db);
ui.treeWidget->insertTopLevelItem(ui.treeWidget->topLevelItemCount(), item);
}
ui.treeWidget->header()->resizeSections(QHeaderView::ResizeToContents);
ui.bow_search->apply();
this->setCursor(Qt::ArrowCursor);
}
When I press the button on the second form and the first form shows I see debug writing Updated with printer name but the problem is how can I call or start this funktion show_list()?
Thanks for help.
The problem that you create second instance of UiMainWindow here:
UiMainWindow frmMain;
Then you connect signal with this second instance, call it's slots, but you don't even show this second instance of MainForm. Instead of this, you should connect signal and slot inside the UiMainWindow just after you create DruckerData form. Unfortunatly there is no this code at your question so i can't show exactly place. This should be something like this:
//Inside UiMainWindow
DruckerData *data = new DruckerData(this);
connect(data, SIGNAL(btnSavePressed(QString)),this,SLOT(refreshSaved( QString )));
data->show();
So I have FINALLY gotten to the point where I can select multiple items on a ListView:
ListView {
id: lv_stuffs
horizontalAlignment: HorizontalAlignment.Fill
dataModel: _app.personDataModel //REFERENCE 1
multiSelectAction: MultiSelectActionItem {
}
multiSelectHandler {
actions: [
// Add the actions that should appear on the context menu
// when multiple selection mode is enabled
ActionItem {
title: "Search for stuffs"
onTriggered: {
_app.search(lv_stuffs.selectionList());
}
...
And I am sending this selection list through to my search method:
void ApplicationUI::search(const QVariantList &list)
{
alert(QString("%1 items selected").arg(list.length()));
alert(((Person)list.at(0)).firstName);//<---- THIS IS THE PROBLEM
}
I am trying to get the "Person" object out of the GroupedDataModel that originally bound to the item... and I have to say I am more than a little stumped. The person is being added to the personDataModel via a simple insert method in a database class:
personDataModel->insert(person);
and the items are then bound to the ListView in the QML (REFERENCE 1 above). The binding is all fine and the items are visible in the list. What I can't figure out is how to now extract these "Person" objects out of the QVariantList I am sent via the MultiSelectionMethod.
My person class:
Person::Person(QObject *parent) : QObject(parent){}
Person::Person(const QString &id, const QString &firstname, const QString &lastname, QObject *parent)
: QObject(parent)
, m_id(id)
, m_firstName(firstname)
, m_lastName(lastname)
{
}
QString Person::customerID() const
{
return m_id;
}
QString Person::firstName() const
{
return m_firstName;
}
QString Person::lastName() const
{
return m_lastName;
}
void Person::setCustomerID(const QString &newId)
{
if (newId != m_id) {
m_id = newId;
emit customerIDChanged(newId);
}
}
void Person::setFirstName(const QString &newName)
{
if (newName != m_firstName) {
m_firstName = newName;
emit firstNameChanged(newName);
}
}
void Person::setLastName(const QString &newName)
{
if (newName != m_lastName) {
m_lastName = newName;
emit lastNameChanged(newName);
}
}
I have been PAINFULLY following this tutorial here, https://developer.blackberry.com/cascades/documentation/ui/lists/list_view_selection.html, which conveniently stops right where my question begins.
Are you perhaps looking for the value function?
void ApplicationUI::search(const QVariantList &list)
{
alert(QString("%1 items selected").arg(list.length()));
alert(((Person)list.value(0)).firstName);
}
(syntax of the extraction of the firstName value may not be right there, depends on your implementation)
Your Person class will be stored in a QVariant. To accomplish this, Qt has to generate some code specific to your class. It can be done by adding this right after your class definition, in the header file for example: Q_DECLARE_METATYPE(Person). You can read more about this here: http://qt-project.org/doc/qt-4.8/qmetatype.html#Q_DECLARE_METATYPE
Now, to extract the value as a Person object, you can use QVariant::value<T>() (http://qt-project.org/doc/qt-4.8/qvariant.html#value):
alert(list.at(0).value<Person>().firstName());
In QT, a created lineEdit shows a text using the setText() method.
But the cursor is movable for the default text. I want the cursor should not be movable for the default text.
My lineEdit type has been set as password. Hence the default text('Password') is also displayed as '********'. Whenever user types the type has to be changed as password and when there is no text or until the user have not typed any text, the lineEdit should display the plain text 'password'
Any idea to fix the above two issues?
In the constructor put
ui->lineEdit->setPlaceholderText("password");
ui->lineEdit->setReadOnly(1);
And in on_lineEdit_selectionChanged() SLOT, put
ui->lineEdit->setText("");
ui->lineEdit->setEchoMode(QLineEdit::Password);
ui->lineEdit->setReadOnly(0);
I noticed this question has tag pyqt so I'll put an actual answer related to that tag for those actually looking for a python way instead of c++.
self.searchEditText = QtGui.QLineEdit()
self.searchEditText.setPlaceholderText("Search for word")
I managed to do what you want by deriving a class from QLineEdit as per following..
Constructor..
QCustomLineEdit::QCustomLineEdit(QWidget *parent) :
QLineEdit(parent)
{
connect(this, SIGNAL(textChanged(QString)), this, SLOT(onTextChanged(QString)));
connect(this, SIGNAL(cursorPositionChanged(int,int)), this, SLOT(onCursorPositionChanged(int,int)));
setEchoMode(QLineEdit::Password); // Echo mode in your case..
m_echoMode = echoMode(); // Member variable to store original echo mode..
m_placeHolderText = "Password"; // Member variable..
m_isPlaceHolderActive = true; // Member varible..
// Default case..
setPlaceholderText("");
setStyleSheet("QCustomLineEdit{color: gray;}");
setEchoMode(QLineEdit::Normal);
setText(__placeHolderText);
}
Override keyPressEvent..
void QCustomLineEdit::keyPressEvent(QKeyEvent *e)
{
if(m_isPlaceHolderActive)
{
if(e->key() == Qt::Key_Delete || e->key() == Qt::Key_Backspace)
e->accept();
else
QLineEdit::keyPressEvent(e);
return;
}
QLineEdit::keyPressEvent(e);
}
Cursor position change event..
void QCustomLineEdit::onCursorPositionChanged(int /*oldPos*/, int newPos)
{
if(m_isPlaceHolderActive)
{
if(newPos != 0)
setCursorPosition(0);
}
}
Text change event..
void QCustomLineEdit::onTextChanged(const QString &text)
{
if(m_isPlaceHolderActive)
{
if(text.compare(m_placeHolderText) != 0)
{
m_isPlaceHolderActive = false;
// Remove the 'placeHolderText' from 'text' itself..
QString temp = text;
temp = temp.mid(0, text.lastIndexOf(m_placeHolderText));
setStyleSheet("QCustomLineEdit{color: black;}");
setEchoMode(m_echoMode);
setText(temp);
}
else
{
setEchoMode(QLineEdit::Normal);
setText(m_placeHolderText);
setStyleSheet("QCustomLineEdit{color: gray;}");
setCursorPosition(0);
}
}
else
{
if(text.isEmpty())
{
m_isPlaceHolderActive = true;
setStyleSheet("QCustomLineEdit{color: gray;}");
setEchoMode(QLineEdit::Normal);
setText(m_placeHolderText);
}
}
}
I have written it very hastily to just show you. Test it yourself and feel free to point any mistake(s) or optimization(s). Hope this helps.
For question 1, in Qt 5.0 and higher, setPlaceholderText does what you want. https://codereview.qt-project.org/#change,45326