内容

• 特性
• 信号
• 详细描述

MessageDialog QML Type

A native message dialog. 更多...

import 语句：	import Qt.labs.platform 1.1
Since:	Qt 5.8
继承：	Dialog

• 所有成员列表，包括继承成员

特性

• buttons : flags
• detailedText : string
• informativeText : string
• text : string

信号

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

详细描述

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 以向用户发出状况警报， 情报文本 以进一步阐述警报或向用户询问问题，和可选 细节文本 to provide even more data if the user requests it. A message box can also display a configurable set of buttons 为接受用户响应。

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."
}
					

用户必须点击 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 情报文本 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 而不是 QGuiApplication .

要链接到 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();
}
					

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

特性文档编制

buttons : flags

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

Possible flags:

常量	描述
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.

另请参阅 clicked() .

detailedText : string

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

另请参阅 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.

另请参阅 text and detailedText .

text : string

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

另请参阅 informativeText and detailedText .

信号文档编制

abortClicked ()

此信号发射当 Abort 被点击。

applyClicked ()

此信号发射当 Apply 被点击。

cancelClicked ()

此信号发射当 Cancel 被点击。

clicked ( button )

This signal is emitted when a dialog button 被点击。

另请参阅 buttons .

closeClicked ()

此信号发射当 Close 被点击。

discardClicked ()

此信号发射当 Discard 被点击。

helpClicked ()

此信号发射当 帮助 被点击。

ignoreClicked ()

此信号发射当 Ignore 被点击。

noClicked ()

此信号发射当 No 被点击。

noToAllClicked ()

此信号发射当 No To All 被点击。

okClicked ()

此信号发射当 Ok 被点击。

openClicked ()

此信号发射当 打开 被点击。

resetClicked ()

此信号发射当 Reset 被点击。

restoreDefaultsClicked ()

此信号发射当 Restore Defaults 被点击。

retryClicked ()

此信号发射当 Retry 被点击。

saveAllClicked ()

此信号发射当 Save All 被点击。

saveClicked ()

此信号发射当 Save 被点击。

yesClicked ()

此信号发射当 Yes 被点击。

yesToAllClicked ()

此信号发射当 Yes To All 被点击。