Qt 5.9 | Qt Labs Platform | QML Types | MessageDialog QML Type

Qt 5.9.9 Reference Documentation

# MessageDialog QML Type

A native message dialog. More...

Import Statement: | import Qt.labs.platform 1.0
Since: | Qt 5.8
Inherits: | Dialog

- List of all members, including inherited members

## Properties

- buttons : flags
- detailedText : string
- informativeText : string
- text : string

## Signals

- void abortClicked()
- void applyClicked()
- void cancelClicked()
- void clicked(button)
- void closeClicked()
- void discardClicked()
- void helpClicked()
- void ignoreClicked()
- void noClicked()
- void noToAllClicked()
- void okClicked()
- void openClicked()
- void resetClicked()
- void restoreDefaultsClicked()
- void retryClicked()
- void saveAllClicked()
- void saveClicked()
- void yesClicked()
- void yesToAllClicked()

## Detailed Description

The MessageDialog type provides a QML API for native platform message dialogs.

A message dialog is used to inform the user, or ask the user a question. A message dialog displays a primary text to alert the user to a situation, an informative text to further explain the alert or to ask the user a question, and an optional detailed text to provide even more data if the user requests it. A message box can also display a configurable set of buttons for accepting a user response.

To show a message dialog, construct an instance of MessageDialog, set the desired properties, and call open().

      MessageDialog {
          buttons: MessageDialog.Ok
          text: "The document has been modified."
      }

The user must click the OK button to dismiss the message dialog. A modal message dialog blocks the rest of the GUI until the message is dismissed.

A more elaborate approach than just alerting the user to an event is to also ask the user what to do about it. Store the question in the informative text property, and specify the buttons property to the set of buttons you want as the set of user responses. The buttons are specified by combining values using the bitwise OR operator. The display order for the buttons is platform dependent.

      MessageDialog {
          text: "The document has been modified."
          informativeText: "Do you want to save your changes?"
          buttons: MessageDialog.Ok | MessageDialog.Cancel

          onAccepted: document.save()
      }

The clicked() signal passes the information of which button was clicked.

A native platform message dialog is currently available on the following platforms:

- iOS
- Android
- WinRT

The Qt Labs Platform module uses Qt Widgets as a fallback on platforms that do not have a native implementation available. Therefore, applications that use types from the Qt Labs Platform module should link to QtWidgets and use QApplication instead of QGuiApplication.

To link against the QtWidgets library, add the following to your qmake project file:

      QT += widgets

Create an instance of QApplication in `main()`:

      #include <QApplication>
      #include <QQmlApplicationEngine>

      int main(int argc, char *argv[])
      {
          QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
          QApplication app(argc, argv);
          QQmlApplicationEngine engine;
          engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
          return app.exec();
      }

Note: Types in Qt.labs modules are not guaranteed to remain compatible in future versions.

## Property Documentation

buttons : flags

This property holds a combination of buttons that are used by the message dialog. The default value is `MessageDialog.NoButton`.

Possible flags:

Constant | Description
--- | ---
`MessageDialog.Ok` | An "OK" button defined with the `AcceptRole`.
`MessageDialog.Open` | An "Open" button defined with the `AcceptRole`.
`MessageDialog.Save` | A "Save" button defined with the `AcceptRole`.
`MessageDialog.Cancel` | A "Cancel" button defined with the `RejectRole`.
`MessageDialog.Close` | A "Close" button defined with the `RejectRole`.
`MessageDialog.Discard` | A "Discard" or "Don't Save" button, depending on the platform, defined with the `DestructiveRole`.
`MessageDialog.Apply` | An "Apply" button defined with the `ApplyRole`.
`MessageDialog.Reset` | A "Reset" button defined with the `ResetRole`.
`MessageDialog.RestoreDefaults` | A "Restore Defaults" button defined with the `ResetRole`.
`MessageDialog.Help` | A "Help" button defined with the `HelpRole`.
`MessageDialog.SaveAll` | A "Save All" button defined with the `AcceptRole`.
`MessageDialog.Yes` | A "Yes" button defined with the `YesRole`.
`MessageDialog.YesToAll` | A "Yes to All" button defined with the `YesRole`.
`MessageDialog.No` | A "No" button defined with the `NoRole`.
`MessageDialog.NoToAll` | A "No to All" button defined with the `NoRole`.
`MessageDialog.Abort` | An "Abort" button defined with the `RejectRole`.
`MessageDialog.Retry` | A "Retry" button defined with the `AcceptRole`.
`MessageDialog.Ignore` | An "Ignore" button defined with the `AcceptRole`.
`MessageDialog.NoButton` | The dialog has no buttons.

See also clicked().

detailedText : string

This property holds the text to be displayed in the details area.

See also text and informativeText.

informativeText : string

This property holds the informative text that provides a fuller description for the message.

Informative text can be used to expand upon the text to give more information to the user.

See also text and detailedText.

text : string

This property holds the text to be displayed on the message dialog.

See also informativeText and detailedText.

## Signal Documentation

void abortClicked()

This signal is emitted when Abort is clicked.

void applyClicked()

This signal is emitted when Apply is clicked.

void cancelClicked()

This signal is emitted when Cancel is clicked.

void clicked(button)

This signal is emitted when a dialog button is clicked.

See also buttons.

void closeClicked()

This signal is emitted when Close is clicked.

void discardClicked()

This signal is emitted when Discard is clicked.

void helpClicked()

This signal is emitted when Help is clicked.

void ignoreClicked()

This signal is emitted when Ignore is clicked.

void noClicked()

This signal is emitted when No is clicked.

void noToAllClicked()

This signal is emitted when No To All is clicked.

void okClicked()

This signal is emitted when Ok is clicked.

void openClicked()

This signal is emitted when Open is clicked.

void resetClicked()

This signal is emitted when Reset is clicked.

void restoreDefaultsClicked()

This signal is emitted when Restore Defaults is clicked.

void retryClicked()

This signal is emitted when Retry is clicked.

void saveAllClicked()

This signal is emitted when Save All is clicked.

void saveClicked()

This signal is emitted when Save is clicked.

void yesClicked()

This signal is emitted when Yes is clicked.

void yesToAllClicked()

This signal is emitted when Yes To All is clicked.