QDialog

The QDialog class is the base class of dialog windows. More

Inheritance diagram of PySide6.QtWidgets.QDialog

Inherited by: QWizard, QProgressDialog, QMessageBox, QInputDialog, QFontDialog, QErrorMessage, QColorDialog, QPrintPreviewDialog, QPageSetupDialog, QAbstractPrintDialog, QPrintDialog, QFileDialog

Synopsis

Functions

Virtual functions

Detailed Description

A dialog window is a top-level window mostly used for short-term tasks and brief communications with the user. QDialogs may be modal or modeless. QDialogs can provide a return value , and they can have default buttons . QDialogs can also have a QSizeGrip in their lower-right corner, using setSizeGripEnabled() .

Note that QDialog (and any other widget that has type Qt::Dialog) uses the parent widget slightly differently from other classes in Qt. A dialog is always a top-level widget, but if it has a parent, its default location is centered on top of the parent’s top-level widget (if it is not top-level itself). It will also share the parent’s taskbar entry.

Use the overload of the setParent() function to change the ownership of a QDialog widget. This function allows you to explicitly set the window flags of the reparented widget; using the overloaded function will clear the window flags specifying the window-system properties for the widget (in particular it will reset the Dialog flag).

Note

The parent relationship of the dialog does not imply that the dialog will always be stacked on top of the parent window. To ensure that the dialog is always on top, make the dialog modal. This also applies for child windows of the dialog itself. To ensure that child windows of the dialog stay on top of the dialog, make the child windows modal as well.

Modeless Dialogs

A modeless dialog is a dialog that operates independently of other windows in the same application. Find and replace dialogs in word-processors are often modeless to allow the user to interact with both the application’s main window and with the dialog.

Modeless dialogs are displayed using show() , which returns control to the caller immediately.

If you invoke the show() function after hiding a dialog, the dialog will be displayed in its original position. This is because the window manager decides the position for windows that have not been explicitly placed by the programmer. To preserve the position of a dialog that has been moved by the user, save its position in your closeEvent() handler and then move the dialog to that position, before showing it again.

Default Button

A dialog’s default button is the button that’s pressed when the user presses Enter (Return). This button is used to signify that the user accepts the dialog’s settings and wants to close the dialog. Use setDefault() , isDefault() and autoDefault() to set and control the dialog’s default button.

Escape Key

If the user presses the Esc key in a dialog, reject() will be called. This will cause the window to close: The close event cannot be ignored .

Extensibility

Extensibility is the ability to show the dialog in two ways: a partial dialog that shows the most commonly used options, and a full dialog that shows all the options. Typically an extensible dialog will initially appear as a partial dialog, but with a More toggle button. If the user presses the More button down, the dialog is expanded. The Extension Example shows how to achieve extensible dialogs using Qt.

Return Value (Modal Dialogs)

Modal dialogs are often used in situations where a return value is required, e.g. to indicate whether the user pressed OK or Cancel. A dialog can be closed by calling the accept() or the reject() slots, and exec() will return Accepted or Rejected as appropriate. The exec() call returns the result of the dialog. The result is also available from result() if the dialog has not been destroyed.

In order to modify your dialog’s close behavior, you can reimplement the functions accept() , reject() or done() . The closeEvent() function should only be reimplemented to preserve the dialog’s position or to override the standard close or reject behavior.

Code Examples

A modal dialog:

def countWords(self):
    dialog = WordCountDialog(self)
    dialog.setWordCount(document().wordCount())
    dialog.exec_()

A modeless dialog:

def find(self):
    if not self.findDialog:
        self.findDialog = FindDialog(self)
        self.findDialog.findNext.connect(self.findNext)

    self.findDialog.show()
    self.findDialog.raise()
    self.findDialog.activateWindow()
class PySide6.QtWidgets.QDialog([parent=None[, f=Qt.WindowFlags()]])
Parameters

Constructs a dialog with parent parent.

A dialog is always a top-level widget, but if it has a parent, its default location is centered on top of the parent. It will also share the parent’s taskbar entry.

The widget flags f are passed on to the QWidget constructor. If, for example, you don’t want a What’s This button in the title bar of the dialog, pass WindowTitleHint | WindowSystemMenuHint in f.

See also

setWindowFlags()

PySide6.QtWidgets.QDialog.DialogCode

The value returned by a modal dialog.

Constant

Description

QDialog.Accepted

QDialog.Rejected

PySide6.QtWidgets.QDialog.accept()

Hides the modal dialog and sets the result code to Accepted.

See also

reject() done()

PySide6.QtWidgets.QDialog.accepted()
PySide6.QtWidgets.QDialog.adjustPosition(arg__1)
Parameters

arg__1PySide6.QtWidgets.QWidget

PySide6.QtWidgets.QDialog.done(arg__1)
Parameters

arg__1 – int

Closes the dialog and sets its result code to r. The signal will emit r; if r is Accepted or Rejected , the or the signals will also be emitted, respectively.

If this dialog is shown with exec() , also causes the local event loop to finish, and exec() to return r.

As with close() , deletes the dialog if the WA_DeleteOnClose flag is set. If the dialog is the application’s main widget, the application terminates. If the dialog is the last window closed, the lastWindowClosed() signal is emitted.

See also

accept() reject() activeWindow() quit()

PySide6.QtWidgets.QDialog.exec_()
Return type

int

Shows the dialog as a modal dialog , blocking until the user closes it. The function returns a DialogCode result.

If the dialog is application modal , users cannot interact with any other window in the same application until they close the dialog. If the dialog is window modal , only interaction with the parent window is blocked while the dialog is open. By default, the dialog is application modal.

Note

Avoid using this function; instead, use open(). Unlike , open() is asynchronous, and does not spin an additional event loop. This prevents a series of dangerous bugs from happening (e.g. deleting the dialog’s parent while the dialog is open via ). When using open() you can connect to the signal of QDialog to be notified when the dialog is closed.

PySide6.QtWidgets.QDialog.finished(result)
Parameters

result – int

PySide6.QtWidgets.QDialog.isSizeGripEnabled()
Return type

bool

PySide6.QtWidgets.QDialog.open()

Shows the dialog as a window modal dialog , returning immediately.

PySide6.QtWidgets.QDialog.reject()

Hides the modal dialog and sets the result code to Rejected.

See also

accept() done()

PySide6.QtWidgets.QDialog.rejected()
PySide6.QtWidgets.QDialog.result()
Return type

int

In general returns the modal dialog’s result code, Accepted or Rejected.

Note

When called on a QMessageBox instance, the returned value is a value of the StandardButton enum.

Do not call this function if the dialog was constructed with the WA_DeleteOnClose attribute.

PySide6.QtWidgets.QDialog.setModal(modal)
Parameters

modal – bool

PySide6.QtWidgets.QDialog.setResult(r)
Parameters

r – int

See also

result()

PySide6.QtWidgets.QDialog.setSizeGripEnabled(arg__1)
Parameters

arg__1 – bool