How to lock all toolbars via menu in Qt? - c++

Question

I am experimenting with Qt Creator and the Application Example.
I would like to add a checkable menu entry to a toolbar menu that reads "Lock toolbars" and, when checked, locks the positions of all tool bars. I guess that it is a quite common feature.
I have managed to find a command that locks single bars via :
toolBar->setMovable(false);
But I cannot figure out how to lock all toolbars.
Edit
This question used to contain an inquiry concerning the toolbar context menu rather than the standard menu. Since I got an answer concerning the context menu elsewhere I removed it from this question.
How to add an entry to toolbar context menu in qt?

Answer 1

Here is an example of how you can achieve it. First, add a QAction and a QMenu; also, declare all your toolbars private :
private:
QMenu* m_pLockMenu;
QToolBar* m_pFileToolBar;
QToolBar* m_pEditToolBar;
QToolBar* m_pHelpToolBar;
QAction* m_pLockAction;
Also, declare a slot where you will manage the locking of your toolbars when the action will be triggered :
public slots :
void lockActionTriggered();
Implement your slot. You just need to lock all the toolbars :
void lockActionTriggered()
{
m_pFileToolBar->setMovable(false);
m_pEditToolbar->setMovable(false);
m_pHelpToolBar->setMovable(false);
}
Now, you just have to declare your main window in your .cpp, and add the menu, the toolbars and the action in it :
QMainWindow* mainWindow = new QMainWindow();
m_pLockMenu = mainWindow->menuBar()->addMenu("Lock Toolbars");
m_pFileToolBar = mainWindow->addToolBar("File");
m_pEditToolBar = mainWindow->addToolBar("Edit");
m_pHelpToolBar = mainWindow->addToolBar("Help");
m_pLockAction = new QAction("Lock", this);
Now, add the action to the menu :
m_pLockMenu->addAction(m_pLockAction);
And connect the QAction's signal triggered() to your slot :
connect(m_pLockAction, SIGNAL(triggered()), this, SLOT(lockActionTriggered()));
Don't forget to show() your main window :
mainWindow->show();
And it should be working now!
EDIT
Your code must look like this :
In the mainwindow.h :
class MainWindow : public QMainWindow
{
...
private:
QMenu* m_pLockMenu;
QToolBar* m_pFileToolBar;
QToolBar* m_pEditToolBar;
QToolBar* m_pHelpToolBar;
QAction* m_pLockAction;
public slots :
void lockActionTriggered();
};
In the main.cpp:
int main(int argc, char *argv[])
{
...
QApplication app(argc, argv);
MainWindow window;
window.show();
app.exec();
}
In the mainwindow.cpp:
void MainWindow::createActions()
{
m_pLockMenu = menuBar()->addMenu("Lock Toolbars");
m_pFileToolBar = addToolBar("File");
m_pEditToolBar = addToolBar("Edit");
m_pHelpToolBar = addToolBar("Help");
m_pLockAction = new QAction("Lock", this);
m_pLockMenu->addAction(m_pLockAction);
connect(m_pLockAction, SIGNAL(triggered()), this, SLOT(lockActionTriggered()));
...
}
void MainWindow::lockActionTriggered()
{
m_pFileToolBar->setMovable(false);
m_pEditToolbar->setMovable(false);
m_pHelpToolBar->setMovable(false);
}

Answer 2

If you have a pointer to your mainwindow, you can simply find all the toolbars and iterate over them:
// in slot
for (auto *t: mainWindow->findChildren<QToolBar*>())
t->setMovable(false);
Alternatively, you might want to connect all toolbars to a single toggle action, when you initialise the UI:
// in constructor
for (auto *t: this->findChildren<QToolBar*>())
connect(action, &QAction::toggled, t, &QToolBar::setMovable);

Answer 3

One common example with flexible lock options
# Created by BaiJiFeiLong#gmail.com at 2022/2/15 22:56
import typing
from PySide2 import QtWidgets, QtGui, QtCore
class Window(QtWidgets.QMainWindow):
def createPopupMenu(self) -> QtWidgets.QMenu:
menu = super().createPopupMenu()
menu.addSeparator()
toolBars: typing.Sequence[QtWidgets.QToolBar] = self.findChildren(QtWidgets.QToolBar)
for toolbar in toolBars:
if toolbar.rect().contains(toolbar.mapFromGlobal(QtGui.QCursor.pos())):
title = "%s %s" % ("Lock" if toolbar.isMovable() else "Unlock", toolbar.windowTitle())
menu.addAction(title, lambda toolbar=toolbar: toolbar.setMovable(not toolbar.isMovable()))
menu.addSeparator()
if any(x.isMovable() for x in toolBars):
menu.addAction("Lock All", lambda: list(x.setMovable(False) for x in toolBars))
if any(not x.isMovable() for x in toolBars):
menu.addAction("Unlock All", lambda: list(x.setMovable(True) for x in toolBars))
return menu
app = QtWidgets.QApplication()
window = Window()
window.setWindowTitle("Toolbar Example")
for i in range(1, 6):
toolBar = window.addToolBar(f"ToolBar{i}")
toolBar.setMovable(i % 2 == 0)
toolBar.addWidget(QtWidgets.QPushButton(f"ToolBar {i}"))
label = QtWidgets.QLabel("Ready")
label.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
window.setCentralWidget(label)
window.resize(800, 600)
window.show()
app.exec_()