How do I show a message box with Qt Quick Controls?

问题

What is the equivalent of QMessageBox::information() when one wishes to write a QML application using Qt Quick Controls?

回答1:

In Qt 5.2 there is MessageDialog:

http://doc.qt.io/qt-5/qml-qtquick-dialogs-messagedialog.html

import QtQuick 2.2
import QtQuick.Dialogs 1.1

MessageDialog {
    id: messageDialog
    title: "May I have your attention please"
    text: "It's so cool that you are using Qt Quick."
    onAccepted: {
        console.log("And of course you could only agree.")
        Qt.quit()
    }
    Component.onCompleted: visible = true
}

回答2:

You Can use Popup In QtQuick Controls 2 :

import QtQuick.Window 2.2
import QtQuick.Controls 2.0 // or import Qt.labs.controls 1.0

Window {
    id: window
    width: 400
    height: 400
    visible: true
Button {
    text: "Open"
    onClicked: popup.open()
}

Popup {
    id: popup
    x: 100
    y: 100
    width: 200
    height: 300
    modal: true
    focus: true
    closePolicy: Popup.CloseOnEscape | Popup.CloseOnPressOutsideParent
    }
}

回答3:

Ok this does the job (badly). Import the Window object:

import QtQuick.Window 2.1

Then add this to your main window (or you could put it in another file I guess):

function showMessage(text, title)
{
    messageBox.text = text;
    messageBox.title = title;
    messageBox.visible = true;
}

Window {
    id: messageBox
    modality: Qt.ApplicationModal
    title: ""
    visible: false
    property alias text: messageBoxLabel.text
    color: parent.color
    minimumHeight: 100
    minimumWidth: 300
    Label {
        anchors.margins: 10
        anchors.top: parent.top
        anchors.left: parent.left
        anchors.right: parent.right
        anchors.bottom: messageBoxButton.top
        horizontalAlignment: Text.AlignHCenter
        wrapMode: Text.WordWrap
        id: messageBoxLabel
        text: ""
    }

    Button {
        anchors.margins: 10
        id: messageBoxButton
        anchors.bottom: parent.bottom
        anchors.horizontalCenter: parent.horizontalCenter
        text: "Ok"
        onClicked: messageBox.visible = false
    }
}

Problems with it:

The window can be shrunk so that the text and button overlap.
The minimum window size is hard-coded rather than calculated from the text size.
You can't select the text.
Looks a bit shit.

回答4:

Unfortunately, there isn't one, at least not in the shipping Qt Quick Controls as of Qt 5.1.1 :(

You need to add it to your project via a QObject wrapper.

回答5:

// CenteredDialog.qml
import QtQml 2.2

import QtQuick 2.9
import QtQuick.Controls 2.2

Dialog {
    parent: ApplicationWindow.overlay

    x: (parent.width - width) / 2
    y: (parent.height - height) / 2

    focus: true
    modal: true

    property alias text: messageText.text

    Label {
        id: messageText

        verticalAlignment: Text.AlignVCenter
        horizontalAlignment: Text.AlignHCenter

        anchors.fill: parent
    }

    standardButtons: Dialog.Ok
}

You can declare CenteredDialog { id: centeredDialog } somewhere, then in some event handler you may call:

 centeredDialog.title = qsTr("Error!")
 centeredDialog.text = qsTr("Access violation")
 centeredDialog.visible = true

来源：https://stackoverflow.com/questions/18788039/how-do-i-show-a-message-box-with-qt-quick-controls

标签

qml

qt-quick

qtquick2