QDialog¶
Inherited by: QAbstractPrintDialog, QPageSetupDialog, QPrintDialog, QPrintPreviewDialog, QColorDialog, QErrorMessage, QFileDialog, QFontDialog, QInputDialog, QMessageBox, QProgressDialog, QWizard
Synopsis¶
Functions¶
def
adjustPosition
(arg__1)def
extension
()def
isSizeGripEnabled
()def
orientation
()def
result
()def
setExtension
(extension)def
setModal
(modal)def
setOrientation
(orientation)def
setResult
(r)def
setSizeGripEnabled
(arg__1)
Virtual functions¶
Slots¶
def
showExtension
(arg__1)
Signals¶
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 havedefault buttons
. QDialogs can also have aQSizeGrip
in their lower-right corner, usingsetSizeGripEnabled()
.Note that
QDialog
(and any other widget that has typeQt::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 aQDialog
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 theDialog
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.
Modal Dialogs¶
A modal dialog is a dialog that blocks input to other visible windows in the same application. Dialogs that are used to request a file name from the user or that are used to set application preferences are usually modal. Dialogs can be
application modal
(the default) orwindow modal
.When an application modal dialog is opened, the user must finish interacting with the dialog and close it before they can access any other window in the application. Window modal dialogs only block access to the window associated with the dialog, allowing the user to continue to use other windows in an application.
The most common way to display a modal dialog is to call its
exec()
function. When the user closes the dialog,exec()
will provide a usefulreturn value
. To close the dialog and return the appropriate value, you must connect a default button, e.g. an OK button to theaccept()
slot and a Cancel button to thereject()
slot. Alternatively, you can call thedone()
slot withAccepted
orRejected
.An alternative is to call
setModal
(true) orsetWindowModality()
, thenshow()
. Unlikeexec()
,show()
returns control to the caller immediately. CallingsetModal
(true) is especially useful for progress dialogs, where the user must have the ability to interact with the dialog, e.g. to cancel a long running operation. If you useshow()
andsetModal
(true) together to perform a long operation, you must callprocessEvents()
periodically during processing to enable the user to interact with the dialog. (SeeQProgressDialog
.)
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 yourcloseEvent()
handler and then move the dialog to that position, before showing it again.
Escape Key¶
If the user presses the Esc key in a dialog,
reject()
will be called. This will cause the window to close: Theclose event
cannot beignored
.
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 thereject()
slots, andexec()
will returnAccepted
orRejected
as appropriate. Theexec()
call returns the result of the dialog. The result is also available fromresult()
if the dialog has not been destroyed.In order to modify your dialog’s close behavior, you can reimplement the functions
accept()
,reject()
ordone()
. ThecloseEvent()
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()See also
QDialogButtonBox
QTabWidget
QWidget
QProgressDialog
GUI Design Handbook: Dialogs, Standard Extension Example Standard Dialogs Example
- class PySide2.QtWidgets.QDialog([parent=None[, f=Qt.WindowFlags()]])¶
- param f:
WindowFlags
- param parent:
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 theQWidget
constructor. If, for example, you don’t want a What’s This button in the title bar of the dialog, passWindowTitleHint
|WindowSystemMenuHint
inf
.See also
- PySide2.QtWidgets.QDialog.DialogCode¶
The value returned by a modal dialog.
Constant
Description
QDialog.Accepted
QDialog.Rejected
- PySide2.QtWidgets.QDialog.accept()¶
Hides the modal dialog and sets the result code to
Accepted
.
- PySide2.QtWidgets.QDialog.accepted()¶
- PySide2.QtWidgets.QDialog.adjustPosition(arg__1)¶
- Parameters:
arg__1 –
PySide2.QtWidgets.QWidget
- PySide2.QtWidgets.QDialog.done(arg__1)¶
- Parameters:
arg__1 – int
Closes the dialog and sets its result code to
r
. Thefinished()
signal will emitr
; ifr
isAccepted
orRejected
, theaccepted()
or therejected()
signals will also be emitted, respectively.If this dialog is shown with
exec()
, also causes the local event loop to finish, andexec()
to returnr
.As with
close()
, deletes the dialog if theWA_DeleteOnClose
flag is set. If the dialog is the application’s main widget, the application terminates. If the dialog is the last window closed, thelastWindowClosed()
signal is emitted.See also
accept()
reject()
activeWindow()
quit()
- PySide2.QtWidgets.QDialog.exec_()¶
- Return type:
int
Shows the dialog as a
modal dialog
, blocking until the user closes it. The function returns aDialogCode
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 iswindow 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 usingopen()
you can connect to thefinished()
signal ofQDialog
to be notified when the dialog is closed.See also
- PySide2.QtWidgets.QDialog.extension()¶
- Return type:
Note
This function is deprecated.
Returns the dialog’s extension or
None
if no extension has been defined.Instead of using this functionality, we recommend that you simply call
show()
orhide()
on the part of the dialog that you want to use as an extension. See the Extension Example for details.
- PySide2.QtWidgets.QDialog.finished(result)¶
- Parameters:
result – int
- PySide2.QtWidgets.QDialog.isSizeGripEnabled()¶
- Return type:
bool
This property holds whether the size grip is enabled.
A
QSizeGrip
is placed in the bottom-right corner of the dialog when this property is enabled. By default, the size grip is disabled.
- PySide2.QtWidgets.QDialog.open()¶
Shows the dialog as a
window modal dialog
, returning immediately.See also
exec()
show()
result()
setWindowModality()
- PySide2.QtWidgets.QDialog.orientation()¶
- Return type:
Note
This function is deprecated.
Returns the dialog’s extension orientation.
Instead of using this functionality, we recommend that you simply call
show()
orhide()
on the part of the dialog that you want to use as an extension. See the Extension Example for details.See also
- PySide2.QtWidgets.QDialog.reject()¶
Hides the modal dialog and sets the result code to
Rejected
.
- PySide2.QtWidgets.QDialog.rejected()¶
- PySide2.QtWidgets.QDialog.result()¶
- Return type:
int
In general returns the modal dialog’s result code,
Accepted
orRejected
.Note
When called on a
QMessageBox
instance, the returned value is a value of theStandardButton
enum.Do not call this function if the dialog was constructed with the
WA_DeleteOnClose
attribute.See also
- PySide2.QtWidgets.QDialog.setExtension(extension)¶
- Parameters:
extension –
PySide2.QtWidgets.QWidget
Note
This function is deprecated.
Sets the widget,
extension
, to be the dialog’s extension, deleting any previous extension. The dialog takes ownership of the extension. Note that ifNone
is passed, any existing extension will be deleted. This function must only be called while the dialog is hidden.Instead of using this functionality, we recommend that you simply call
show()
orhide()
on the part of the dialog that you want to use as an extension. See the Extension Example for details.See also
- PySide2.QtWidgets.QDialog.setModal(modal)¶
- Parameters:
modal – bool
This property holds whether
show()
should pop up the dialog as modal or modeless.By default, this property is
false
andshow()
pops up the dialog as modeless. Setting this property to true is equivalent to settingwindowModality
toApplicationModal
.exec()
ignores the value of this property and always pops up the dialog as modal.See also
windowModality
show()
exec()
- PySide2.QtWidgets.QDialog.setOrientation(orientation)¶
- Parameters:
orientation –
Orientation
Note
This function is deprecated.
If
orientation
isHorizontal
, the extension will be displayed to the right of the dialog’s main area. Iforientation
isVertical
, the extension will be displayed below the dialog’s main area.Instead of using this functionality, we recommend that you simply call
show()
orhide()
on the part of the dialog that you want to use as an extension. See the Extension Example for details.See also
- PySide2.QtWidgets.QDialog.setResult(r)¶
- Parameters:
r – int
Sets the modal dialog’s result code to
i
.Note
We recommend that you use one of the values defined by
DialogCode
.See also
- PySide2.QtWidgets.QDialog.setSizeGripEnabled(arg__1)¶
- Parameters:
arg__1 – bool
This property holds whether the size grip is enabled.
A
QSizeGrip
is placed in the bottom-right corner of the dialog when this property is enabled. By default, the size grip is disabled.
- PySide2.QtWidgets.QDialog.showExtension(arg__1)¶
- Parameters:
arg__1 – bool
Note
This function is deprecated.
If
showIt
is true, the dialog’s extension is shown; otherwise the extension is hidden.Instead of using this functionality, we recommend that you simply call
show()
orhide()
on the part of the dialog that you want to use as an extension. See the Extension Example for details.See also
© 2022 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.