I'm creating an automated test application using QTest Library. I'm able to simulate key presses on the application except when it gets to a window having QDialogButtonBox (Save, and Cancel).
Here's my sample code:
std::auto_ptr<MainForm> myForm( new MainForm( 3, 3 ));
myForm->show();
QTest::keyPress(myForm.get(), Qt::Key_0, NULL, 1000);
QTest::keyRelease(myForm.get(), Qt::Key_0, NULL, 100);
QWidget *pWin = QApplication::activeWindow();
QCOMPARE(QString(pWin->objectName()), QString("MyMainForm"));
now when it gets to the next window, it has several controls where the input focus is on a text edit control. When I press Enter, it presses the "Save" button. So theoretically, if I should pass Qt::Enter to the Form, it should press the "Save" button as well. However when I try to pass a keyPress:
QTest::keyPress(pWin, Qt::Key_Enter, 1000);
nothing happens... what do you think is going on? I've tried setFocus() to the button but nothing happens as well...
in QDialogButtonBox you may get needed button with
QPushButton * QDialogButtonBox::button ( StandardButton which )
and then call it's SetFocus method.
If you can't access QDialogButtonBox directly, you may get it with
QList<T> QObject::findChildren ( const QString & name = QString() )
or even get buttons themself with this method...
I think you need to send the key event to the button or line edit instead of the parent window.
QWidget *pWin = QApplication::activeWindow();
QTest::keyPress(pwin, Qt::Key_0, NULL, 1000);
QTest::keyRelease(pwin, Qt::Key_0, NULL, 100);
I have to say that the documentation is not clear, but it works for me this way.
Related
To save space in a QTabWidget, I would like to show the close icon only for the current tab, like e.g. Firefox is doing:
Is there a simple way using a style sheet, some thing like (not working like this)
QTabBar::tab::!selected::close-button {visible: false;}
or do I have to subclass QTabWidget to get the desired behavior?
You won't need to subclass anything, you can use QTabWidget::tabBar() method to obtain a reference (i.e. QTabBar *) to the tab bar associated with your QTabWidget. (Note that this method is no longer protected, so it can be accessed without subclassing the class)
QTabBar *tabBar = tabWidget->tabBar();
You can now use tabBar reference to hide close buttons on non-current tabs. For example to hide ith button, you can do:
tabBar->tabButton(i, QTabBar::RightSide)->hide();
So a simple workflow could be as follows:
Connect QTabWidget::currentChanged(int index) signal to a slot.
In that slot hide all close buttons other than the button at index.
You can subclass QTabWidget to get access to the QTabBar widget using protected method QTabWidget::tabBar. Then you can connect to the QTabBar::currentChanged signal and hide close button for not selected tabs manually:
QTabBar::ButtonPosition closeSide =
(QTabBar::ButtonPosition)style()->styleHint(QStyle::SH_TabBar_CloseButtonPosition, 0, this);
for (int i = 0; i < toolbar->count(); ++i)
{
if (i != toolbar->currentIndex())
{
QWidget *w = toolbar->tabButton(i, closeSide);
w->hide();
}
}
hide() leaves empty space for the invisible close button. This looks funny.
Set the width to 0 instead.
I have a toolbar with buttons: undo, redo, cut, copy, paste, like below:
editmenu = menuBar()->addMenu(QObject::tr("&Edit"));
undoact = editmenu->addAction(QIcon(":images/undo.png"), QObject::tr("&Undo"));
QObject::connect(editwin, SIGNAL(undoAvailable(bool)), undoact, SLOT(setEnabled(bool)));
QObject::connect(undoact, SIGNAL(triggered()), editwin, SLOT(undo()));
undoact->setShortcuts(QKeySequence::keyBindings(QKeySequence::Undo));
undoact->setEnabled(false);
redoact = editmenu->addAction(QIcon(":images/redo.png"), QObject::tr("&Redo"));
QObject::connect(editwin, SIGNAL(redoAvailable(bool)), redoact, SLOT(setEnabled(bool)));
QObject::connect(redoact, SIGNAL(triggered()), editwin, SLOT(redo()));
redoact->setShortcuts(QKeySequence::keyBindings(QKeySequence::Redo));
redoact->setEnabled(false);
editmenu->addSeparator();
cutact = editmenu->addAction(QIcon(":images/cut.png"), QObject::tr("Cu&t"));
cutact->setShortcuts(QKeySequence::keyBindings(QKeySequence::Cut));
cutact->setEnabled(false);
copyact = editmenu->addAction(QIcon(":images/copy.png"), QObject::tr("&Copy"));
copyact->setShortcuts(QKeySequence::keyBindings(QKeySequence::Copy));
copyact->setEnabled(false);
pasteact = editmenu->addAction(QIcon(":images/paste.png"), QObject::tr("&Paste"));
pasteact->setShortcuts(QKeySequence::keyBindings(QKeySequence::Paste));
I want:
Paste button to be enabled only if clipboard contain text
For some reason, I need to disable all buttons for a limitted period of time. After this I want to enable all buttons. But when I enable, each button to be enabled/disabled according to his condition (eg. undo button to be enabled only if there is something to undo, paste button to be enabled only if there is some text that can be pasted ...)
What do you advise me to do? What is the smartest / simplest method?
http://doc.qt.io/qt-5/qclipboard.html#signals
http://doc.qt.io/qt-5/qclipboard.html#details
Create connections from the QClipboard object to a handler slots in your toolbar/mainwindow class. And then in the handler slot do the logic you want to happen to your toolbar buttons.
For example:
http://doc.qt.io/qt-5/qclipboard.html#dataChanged
// in your constructor after creating your buttons:
QObject::connect(qApp->clipboard(), SIGNAL(dataChanged()),
this, SLOT(onClipboardDataChanged()));
// and then make another connection for the other relevant clipboard signal...
// selectionChanged()
Then later in in your slot:
void MainWindow::onClipboardDataChanged()
{
const QClipboard *clipboard = QApplication::clipboard();
const QMimeData *mimeData = clipboard->mimeData();
pasteact->setEnabled(mimeData->hasText());
// or you could check the length of the text to see if it is non zero.
}
To disable/renable all the buttons at once, disable the parent object instead.
editToolbar->setEnabled(false);
//... after some period of time or transactions...
editToolbar->setEnabled(true);
But this probably won't disable the built-in accelerators for Copy, Cut and Paste. To kill those keyboard shortcuts, too, you may need to put an event filter on your app.
http://doc.qt.io/qt-5/accelerators.html
http://doc.qt.io/qt-5/qobject.html#eventFilter
http://doc.qt.io/qt-5/qobject.html#installEventFilter
Hope that helps.
PS. I haven't tested this chunk of code. Read the docs. Good luck.
I have a two state QPushButton. I want to associate an icon to each state.
It is like Play|Pause buttons in music players.
To do so, I would like to get the current icon name in order to know what the next icon to set will be.
I could subclass QPushButton but is it worth it?
Instead of setting an icon based on the QPushButton's state, set one QIcon that has two states, Qt will select the correct icon if you use it with a checkable QPushButton.
QIcon icon = QIcon();
// 'Off' state corresponds to unchecked state of QPushButton
icon.addPixmap( QPixmap( ":/img/play.png" ), QIcon::Normal, QIcon::Off );
// 'On' state corresponds to checked state of QPushButton
icon.addPixmap( QPixmap( ":/img/pause.png" ), QIcon::Normal, QIcon::On );
QPushButton * button = new QPushButton();
button->setIcon( icon );
button->setCheckable( true );
Use QPushButton::icon() and QIcon::name() to get the icon name.
I want to make my app laptop friendly. I can tab to everywhere, but if I tab to a QPushButton I can't press it with Enter, only with space.
What's the problem? How to make it pressable for Enter?
tl;dr
In the Qt Creator's UI view, select the button you want to make pressable for Enter.
In the right side at the Property Editor scroll down to the blue part titled QPushButton.
Check the checkbox by autoDefault or default.
Most of the cases the main different between autoDefault and default is how the button will be rendered. But there are cases where it can cause unexpected things so for more information read more below.
Full review
Overview
Every QPushButton has 3 properties that are not inherited. From these, two (default and autoDefault) have a major role when we place buttons on QDialogs, because these settings (and the focus on one of the buttons) decides which button will be pressed if we hit Enter.
All of these properties are set false by default. Only expection is autoDefault that will be true if the button has a QDialog parent.
Every time you press space the button with the focus on it will be pressed. The followings will describe what happens if you press Enter.
Default property
If this is set true, the button will be a default button.
If Enter is pressed on the dialog, than this button will be pressed, except when the focus is on an autoDefault button.
There should be only one default button. If you add more then the last one added will be the default button.
AutoDefault property
If this is set true, the button will be an autoDefault button.
If Enter is pressed on the dialog, than this button will be pressed if the focus is on it.
If the focus is not on an autoDefault button and there is no default button than the next autoDefault button will be pressed for Enter.
Flat property
If this is set true, then the border of the button will not be raised.
Example tables
The following tables show which button will be pressed with different buttons on different focus. The buttons are added from left to right.
Test code
The following code is a way to add buttons to a dialog. It can be used for testing by changing the boolean values at setDefault() and/or setAutoDefault().
You just need to create a window, add a QPushButton called pushButton and a QLabel called label (that is the default naming). Don't forget to #include <QMessageBox>. Then copy this code to the button's clicked() signal:
void MainWindow::on_pushButton_clicked()
{
QMessageBox msgBox;
QPushButton button("Button");
button.setDefault(false);
button.setAutoDefault(false);
msgBox.addButton(&button, QMessageBox::ActionRole);
QPushButton autodefaultbutton("AutoDefault Button");
autodefaultbutton.setDefault(false);
autodefaultbutton.setAutoDefault(true);
msgBox.addButton(&autodefaultbutton, QMessageBox::ActionRole);
QPushButton autodefaultbutton2("AutoDefault Button2");
autodefaultbutton2.setDefault(false);
autodefaultbutton2.setAutoDefault(true);
msgBox.addButton(&autodefaultbutton2, QMessageBox::ActionRole);
QPushButton defaultbutton("Default Button");
defaultbutton.setDefault(true);
defaultbutton.setAutoDefault(false);
msgBox.addButton(&defaultbutton, QMessageBox::ActionRole);
msgBox.exec();
if (msgBox.clickedButton() == &button) {
ui->label->setText("Button");
} else if (msgBox.clickedButton() == &defaultbutton) {
ui->label->setText("Default Button");
} else if (msgBox.clickedButton() == &autodefaultbutton) {
ui->label->setText("AutoDefault Button");
} else if (msgBox.clickedButton() == &autodefaultbutton2) {
ui->label->setText("AutoDefault Button2");
}
}
Display
If you compile the code you can get this window. You doesn't even have to click to the buttons because the way they are rendered by the OS shows which one will be pressed if you hit Enter or space.
Official documentation
Most of this answer was made according to the official documentation.
The QPushButton documentation made by Qt states these:
Default and autodefault buttons decide what happens when the user
presses enter in a dialog.
A button with this property set to true (i.e., the dialog's default
button,) will automatically be pressed when the user presses enter,
with one exception: if an autoDefault button currently has focus, the
autoDefault button is pressed. When the dialog has autoDefault buttons
but no default button, pressing enter will press either the
autoDefault button that currently has focus, or if no button has
focus, the next autoDefault button in the focus chain.
In a dialog, only one push button at a time can be the default button.
This button is then displayed with an additional frame (depending on
the GUI style).
The default button behavior is provided only in dialogs. Buttons can
always be clicked from the keyboard by pressing Spacebar when the
button has focus.
If the default property is set to false on the current default button
while the dialog is visible, a new default will automatically be
assigned the next time a pushbutton in the dialog receives focus.
It's also worth to check QDialog and QMessageBox.
According to Qt's documentation Enter should work
Command buttons in dialogs are by default auto-default buttons, i.e. they become the default push button automatically when they receive the keyboard input focus. A default button is a push button that is activated when the user presses the Enter or Return key in a dialog. You can change this with setAutoDefault().
http://qt-project.org/doc/qt-4.8/qpushbutton.html
totymedli's answer is great. I added a small program to test various combinations of isDefault, autoDefault, setDefault and setAutoDefault functions.
import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *
class Window(QDialog):
def __init__(self, parent=None):
super(Window, self).__init__(parent)
autoDefaultInitialState = True
defaultInitialState = False
self.lineEdit1 = QLineEdit(self)
self.lineEdit2 = QLineEdit(self)
self.lineEdit3 = QLineEdit(self)
# if we create a new button (e.g. "Print state"), with the same function,
# it doesn't work, because adding a new button (apart from our 3 buttons)
# produces total mess, so we use this lineedit for this purpose
self.lineEdit1.returnPressed.connect(self.printState)
#------------------------------------
self.chkAutoDefaultOk = QCheckBox('OK setAutoDefault', self)
self.chkAutoDefaultCancel = QCheckBox('Cancel setAutoDefault', self)
self.chkAutoDefaultApply = QCheckBox('Apply setAutoDefault', self)
self.chkDefaultOk = QCheckBox('OK setDefault', self)
self.chkDefaultCancel = QCheckBox('Cancel setDefault', self)
self.chkDefaultApply = QCheckBox('Apply setDefault', self)
self.chkAutoDefaultOk.setChecked(autoDefaultInitialState)
self.chkAutoDefaultCancel.setChecked(autoDefaultInitialState)
self.chkAutoDefaultApply.setChecked(autoDefaultInitialState)
self.chkDefaultOk.setChecked(defaultInitialState)
self.chkDefaultCancel.setChecked(defaultInitialState)
self.chkDefaultApply.setChecked(defaultInitialState)
#------------------------------------
self.pushButtonOk = QPushButton(self)
self.pushButtonOk.setText("Ok")
self.pushButtonOk.clicked.connect(lambda : print('ok'))
self.pushButtonCancel = QPushButton(self)
self.pushButtonCancel.setText("Cancel")
self.pushButtonCancel.clicked.connect(lambda : print('cancel'))
self.pushButtonApply = QPushButton(self)
self.pushButtonApply.setText("Apply")
self.pushButtonApply.clicked.connect(lambda : print('apply'))
#------------------------------------
self.pushButtonOk.setAutoDefault(autoDefaultInitialState)
self.pushButtonCancel.setAutoDefault(autoDefaultInitialState)
self.pushButtonApply.setAutoDefault(autoDefaultInitialState)
self.pushButtonOk.setDefault(defaultInitialState)
self.pushButtonCancel.setDefault(defaultInitialState)
self.pushButtonApply.setDefault(defaultInitialState)
#------------------------------------
self.chkAutoDefaultOk.stateChanged.connect(self.chkChangeState)
self.chkAutoDefaultCancel.stateChanged.connect(self.chkChangeState)
self.chkAutoDefaultApply.stateChanged.connect(self.chkChangeState)
self.chkDefaultOk.stateChanged.connect(self.chkChangeState)
self.chkDefaultCancel.stateChanged.connect(self.chkChangeState)
self.chkDefaultApply.stateChanged.connect(self.chkChangeState)
#------------------------------------
self.layout = QGridLayout(self)
self.layout.addWidget(self.lineEdit1, 0, 0, 1, 3)
self.layout.addWidget(self.lineEdit2, 1, 0, 1, 3)
self.layout.addWidget(self.lineEdit3, 2, 0, 1, 3)
self.layout.addWidget(self.chkAutoDefaultOk, 3, 0)
self.layout.addWidget(self.chkAutoDefaultCancel, 3, 1)
self.layout.addWidget(self.chkAutoDefaultApply, 3, 2)
self.layout.addWidget(self.chkDefaultOk, 4, 0)
self.layout.addWidget(self.chkDefaultCancel, 4, 1)
self.layout.addWidget(self.chkDefaultApply, 4, 2)
self.layout.addWidget(self.pushButtonOk, 5, 0)
self.layout.addWidget(self.pushButtonCancel, 5, 1)
self.layout.addWidget(self.pushButtonApply, 5, 2)
def chkChangeState(self):
obj = self.sender()
if (obj == self.chkAutoDefaultOk):
self.pushButtonOk.setAutoDefault(self.chkAutoDefaultOk.isChecked())
elif (obj == self.chkAutoDefaultCancel):
self.pushButtonCancel.setAutoDefault(self.chkAutoDefaultCancel.isChecked())
elif (obj == self.chkAutoDefaultApply):
self.pushButtonApply.setAutoDefault(self.chkAutoDefaultApply.isChecked())
elif (obj == self.chkDefaultOk):
self.pushButtonOk.setDefault(self.chkDefaultOk.isChecked())
elif (obj == self.chkDefaultCancel):
self.pushButtonCancel.setDefault(self.chkDefaultCancel.isChecked())
elif (obj == self.chkDefaultApply):
#print('sender: self.chkDefaultApply')
#print('before: ', self.pushButtonApply.isDefault())
self.pushButtonApply.setDefault(self.chkDefaultApply.isChecked())
#print('after: ', self.pushButtonApply.isDefault())
def printState(self):
print(self.pushButtonOk.autoDefault(), self.pushButtonCancel.autoDefault(), self.pushButtonApply.autoDefault())
print(self.pushButtonOk.isDefault(), self.pushButtonCancel.isDefault(), self.pushButtonApply.isDefault())
print('-' * 50)
app = QApplication(sys.argv)
main = Window()
main.show()
sys.exit(app.exec_())
Set the tab order for your widgets. This will allow usage of return key for clicking. Its in there by default inside Qt.
I want to make a QCheckBox named "Show Captions" disable another QCheckBox named "Show captions if no title" when the first is checked, but my problem is that how I can make it disabled immediately when the user checks the first checkbox.
SetupSlideShow::SetupSlideShow(QWidget* parent)
: QScrollArea(parent), d(new SetupSlideShowPriv)
{
QWidget* panel = new QWidget(viewport());
setWidget(panel);
setWidgetResizable(true);
QVBoxLayout* layout = new QVBoxLayout(panel);
d->showComment = new QCheckBox(i18n("Show captions"), panel);
d->showComment->setWhatsThis( i18n("Show the image caption at the bottom of the screen."));
d->showTitle = new QGroupBox(i18n("Show title"), panel);
d->showTitle->setWhatsThis( i18n("Show the image title at the bottom of the screen."));
d->showTitle->setCheckable(true);
d->showCapIfNoTitle = new QCheckBox(i18n("Show captions if no title"), panel);
d->showCapIfNoTitle->setWhatsThis( i18n("Show the image caption at the bottom of the screen if no titles existed."));
QVBoxLayout *vbox = new QVBoxLayout;
vbox->addWidget(d->showCapIfNoTitle);
d->showTitle->setLayout(vbox);
layout->addWidget(d->showLabels);
layout->addWidget(d->showComment);
layout->addWidget(d->showTitle);
}
Doesn't this work?
connect(d->showComment, SIGNAL(toggled(bool)), d->showCapIfNoTitle, SLOT(setDisabled(bool)));
The call to paintEvent() isn't really doing anything for you regarding immediacy. Nothing will be repainted until control returns to the event loop (after your constructor exits). It is more typical to call update() but even this is unnecessary when changing the properties of built in widgets.
To link the check boxes, define a slot for the stateChanged() signal of showComment, connect the signal to your slot in your constructor above (by calling connect(), and in that slot, call d->showCapIfNoTitle->setCheckState(d->showComment->checkState()).