I created tab with:
ui->tabWidget->addTab(widgetTab,"Title");
I want to add a refresh button after tab text "Title". How can I do that?
I don't believe you can directly. The QTabBar element of QTabWidget is only accessible via the tabBar() member function, which is protected. And QTabBar's setTabButton isn't exposed otherwise in the tab widget's interface.
You could do it by subclassing QTabWidget though. Something like:
class MyTabWidget: public QTabWidget
{
Q_OBJECT
public:
MyTabWidget(QWidget *parent = 0)
: QTabWidget(parent)
{
addTab(new QLabel("foo"), "foo");
addTab(new QLabel("bar"), "bar");
QPushButton *b1 = new QPushButton("<");
QPushButton *b2 = new QPushButton(">");
tabBar()->setTabButton(0, QTabBar::LeftSide, b1);
tabBar()->setTabButton(1, QTabBar::RightSide, b2);
}
};
Related
I have a QHBoxLayout in which I added some widgets. I need to be able to refresh the layout dynamically so I use this to clear the layout :
void ClearLayout(QLayout* layout)
{
if (!layout)
return;
QLayoutItem* item;
while ((item = layout->takeAt(0)) != nullptr)
{
delete item->widget();
ClearLayout(item->layout());
}
}
This indeed removes all widgets and layouts. After this layout->isEmpty() returns true and layout->count() returns 0.
However, when I try to add new widgets (same type of other previously added but new instance) It does not work !
AddWidget()
{
// DeviceWidget inherits QWidget
DeviceWidget* deviceWidget = new DeviceWidget;
deviceWidget->setFixedSize(150, 200);
connect(deviceWidget->GetSignalObject(), &DeviceObject::Selected, this,
&DeviceLayout::SelectedDevice);
layout->addWidget(deviceWidget, 0, Qt::AlignCenter);
}
This is the same function used previously to add the widgets to the layout and worked the first time at Construction:
MainLayout(QWidget* parent) : QHBoxLayout(parent)
{
layout = new QHBoxLayout;
addLayout(layout);
uint32 nb = GetDeviceNumber(); // returns 2
for (uint32 i = 0; i < deviceNb; ++i)
AddDeviceWidget();
}
After trying to add 2 widgets I have layout->isEmpty() returns true and layout->count() returns 2 so I'm confused …
thanks for any help provided :)
EDIT:
The problem seems to be comming from my DeviceWidget class since trying to add a simple QLabel to the cleared layout worked. Here's the DeviceWidget Constructor:
DeviceWidget::DeviceWidget(QWidget* parent) : QWidget(parent)
{
QVBoxLayout* vLayout = new QVBoxLayout;
QLabel* deviceIcon = new QLabel("DeviceIcon", this);
deviceIcon->setFixedSize(128, 128);
deviceIcon->setPixmap(QPixmap::fromImage(QImage("Resources/Icons/device.png")));
deviceIcon->setObjectName("DeviceIcon");
// StatusWidget inherits QWidget
// Just override paintEvent to display a colored filled disk
m_status = new StatusWidget(20, Status::Close, this);
m_status->setObjectName("DeviceStatus");
vLayout->addWidget(deviceIcon, 0, Qt::AlignCenter);
vLayout->addWidget(m_status, 0, Qt::AlignCenter);
// DeviceObjct inherits from QObject an add a signal
m_object = new DeviceObject(size());
// Function clearing the stylesheet background-color
Clear();
setLayout(vLayout);
installEventFilter(this);
setObjectName(QString("DeviceWidget"));
}
Commenting installEventFilter(this) make it work so I think I need to add an event filter to make it work but I don't know which one
As said in the Edit, The problem is coming from DeviceWidget added in the layout that override eventFilter. There is probably a way to add a case in eventFilter to make it work but in my case it was best either (1) or (2):
1. Remove eventFilter from class DeviceWidget and put it in class DeviceObject: m_object is present to emit a signal according to event:
DeviceObject.h:
DeviceObject(QObject* parent);
bool eventFilter(QObject* obj, QEvent* event) override;
signals:
void Select(uint32 i);
Then in class DeviceWidget still call installEventFilter but with m_object as parameter: installEventFilter(m_object);
For the other event (Enter/Leave) I overrode void enterEvent(QEvent* event) and void leaveEvent(QEvent* event) for class DeviceWidget. That's what lead me to the second option that seems better.
2. Completely remove eventFilter and installEventFilter as it is only used to emit a signal when widget is clicked and do things when cursor hovers the widget. Instead override enterEvent and leaveEvent for class DeviceWidget like said before for hover event.
Then in class DeviceObjecy override void mousePressEvent(QMouseEvent*) for clicked event.
I'm writing a Qt desktop application in c++ with Qt Creator.
I declared in my main window a treeView, and a compatible model.
Now, I would like to have a right-click menu for the tree item. Not for all of the items, but for a part of them, for example: for the tree elements with an even index.
I tried adding a simple context menu with the following code:
in the .h file:
QStandardItemModel* model;
QMenu* contextMenu;
QAction* uninstallAction;
private slots:
void uninstallAppletClickedSlot();
and in the .cpp file:
in the constructor:
ui->treeView->setModel(model);
contextMenu = new QMenu(ui->treeView);
ui->treeView->setContextMenuPolicy(Qt::ActionsContextMenu);
uninstallAction = new QAction("Uninstall TA",contextMenu);
ui->treeView->addAction(uninstallAction);
connect(uninstallAction, SIGNAL(triggered()), this, SLOT(uninstallAppletClickedSlot()));
and a slot:
void MainWindow::uninstallAppletClickedSlot()
{
}
this code gives me a context menu with the wanted action, but do you have any idea how can I add this action only for the QStandardItems with the even indexes??
BTW, I'm adding items to the treeView by the following way:
void MainWindow::AddItem(QString name)
{
QStandardItem *parentItem = model->invisibleRootItem();
QStandardItem *app = new QStandardItem(name);
parentItem->appendRow(app);
}
I googled a lot, but found nothing :(
thanks in advance!
I would do this in the following way:
Configure the context menu
ui->treeView->setContextMenuPolicy(Qt::CustomContextMenu);
connect(ui->treeView, SIGNAL(customContextMenuRequested(const QPoint &)), this, SLOT(onCustomContextMenu(const QPoint &)));
Implement the context menu handling
void MainWindow::onCustomContextMenu(const QPoint &point)
{
QModelIndex index = ui->treeView->indexAt(point);
if (index.isValid() && index.row() % 2 == 0) {
contextMenu->exec(ui->treeView->viewport()->mapToGlobal(point));
}
}
I am new to QT. I have several QDialogs in my QT project. I have created a generic class to change the properties of widgets inside QDialogs. My generic class has a static method which will change the properties of widgets.
void MyClass::setFontsizeToWidgets(float modValue, QObject obj)
{
QFont f;
float pointSize = 0.0;
QList<QPushButton*> buttons = obj.findChildren<QPushButton*>();
foreach ( QPushButton * button, buttons)
{
f = button->font();
pointSize = f.pointSizeF();
f.setPointSizeF(pointSize*modValue);
button->setFont(f);
}
}
Now my questions is, how to pass the QDialog as a object to the above static method from QDialog class? So that the static method will change the font size of the QPushButton(s) in the QDialog.
You can do it like this:
void MyClass::setFontsizeToWidgets(float modValue, QObject *obj)
{
//do something
}
void MyDialog::someFunction() //this is a function of your QDialog class
{
MyClass::setFontsizeToWidgets(10, this);
}
I am new to Qt. As it stands, I have a table with a button btn. When the button is clicked the setCentralWidget(view) takes over the window so I can no longer see the table obviously. But if I remove the setCentralWidget(view), nothing displays when I click the button.
Is there a way I can display both in the same window? Split or dock maybe?
(I have removed code that is irrelevant to my question)
MainWindow::MainWindow()
{
//etc
packet = new QTabWidget;
setCentralWidget(packet)
}
//other code
void MainWindow::create(const QString &a)
{
QTableWidget* table = new QTableWidget;
int tabIndex = packet->addTab(table, a);
packet->setCurrentIndex(tabIndex);
table->setRowCount(1);
table->setColumnCount(2);
table->setHorizontalHeaderLabels(QString("a;Simulator").split(";"));"));
table->setItem(0,0,new QTableWidgetItem(a));
QPushButton *btn = new QPushButton("load", this);
connect(btn, SIGNAL(clicked()), this, SLOT(sim()));
table->setCellWidget(0,1, btn);
}
void MainWindow::sim()
{
QGraphicsScene* scene = new QGraphicsScene(QRect(-10, -10, 100, 50));
QGraphicsView* view = new QGraphicsView();
scene->addText("Network");
view->setScene(scene);
view->setGeometry(QRect(10, 10, 100, 50));
setCentralWidget(view);
}
You should look at the QMdiArea class - it's designed to be used as the central widget of a Main Window that can have many inner widgets. It has a variety of layout styles as well - scroll down on that page to see the examples.
Hope that helps!
You should subclass QWidget. For example make your own MyWidget class. And this class will include a QGraphicsView and a QTabWidget in a splitter for example. And in your MainWindow set the central widget as an instance of MyWidget.
I am adding three tables dynamically in widget containing table widget and labels, but nothing shows on screen, I have tried to do it with vertical layout but it does not expand if i add a new row, so not scrolling.
Is there any other way to get all three tables on a same page with scrolling.
QScrollArea *m_scrollArea =ui->scrollArea_Stats;
m_scrollArea->setWidgetResizable(true);
QWidget *area = new QWidget;
QVBoxLayout *vlay = new QVBoxLayout(m_scrollArea);
area->setLayout(vlay);
StatsWidget *objStatsWidget;
for(int i=0;i<2;i++)
{
objStatsWidget=new StatsWidget(ui->scrollArea_Stats);
vlay->addWidget(objStatsWidget);
}
m_scrollArea->setWidget(area);
here StatsWidget is my custom widget containing 2 lables at top and a table widget
I am adding three tables dynamically but page is not scrolling, vlay is not showing all tables it is just showing what it can show in a page without scrolling.
try rewrite the code as this:
m_scrollArea->setWidgetResizable(true);
QVBoxLayout *vlay = new QVBoxLayout;
StatsWidget *objStatsWidget;
for(int i=0;i<2;i++)
{
objStatsWidget=new StatsWidget(ui->scrollArea_Stats);
vlay->addWidget(objStatsWidget);
}
QWidget *area = new QWidget(m_scrollArea);
area->setLayout(vlay);
m_scrollArea->setWidget(area);
EDIT: i made something like what you are trying to do some time ago..
so: create a custom QWidget with a QVBoxLayout as member.let's call this object "widgetList". then reimplement all method that you need, as addWidget, takeAt etc.. using your layout as a list
finally set widgetList as widget for your scroll area..
let me know..
I made all this because QWidgetList was not enough easy to use and i needed something else that i have omitted here..
I found my piece of code:
class WidgetList : public QWidget
{
Q_OBJECT
public:
WidgetList(QWidget *parent = 0);
~WidgetList();
void addWidget(QWidget*);
void removeWidget(QWidget*);
QList<QWidget*> getListWidget() const;
QWidget* takeAt(int) const;
int count() const;
private:
QVBoxLayout* layout_;
};
.cpp
WidgetList::WidgetList(QWidget *parent)
: /**/QWidget(parent)
/**/,layout_(new QVBoxLayout(this))
{
this->setLayout(layout_);
}
void WidgetList::removeWidget(QWidget* widget)
{
layout_->removeWidget(widget);
}
void WidgetList::addWidget(QWidget* widget)
{
layout_->addWidget(widget);
}
QWidget* WidgetList::takeAt(int index) const
{
return layout_->takeAt(index)->widget();
}
int WidgetList::count() const
{
return layout_->count();
}
this will be your new Widget with layout where to insert your custom widget..
then i put widgetList as widget of QScrollArea:
QScrollArea* scrollArea = new QScrollArea;
widgetList* list = new widgetList(scrollArea);
scrollArea->setWidget(list);
everything works for me..
EDIT 2: i post my main that works good with my previous code:
QScrollArea* scroll = new QScrollArea;
WidgetList* w = new WidgetList(scroll);
QLabel * label = new QLabel("Label1");
QLabel* label2 = new QLabel("label2");
QTableWidget* table = new QTableWidget(10,10);
w->addWidget(label);
w->addWidget(label2);
w->addWidget(table);
scroll->setWidget(w);
scroll->setWidgetResizable(true);
scroll->show();