[SailfishDevel] Alpha 2: passing simple properties from main.cpp to qml: A bug?
christopher.lamb at thurweb.ch
christopher.lamb at thurweb.ch
Sun Aug 4 15:05:01 UTC 2013
Hi Martin
Curiouser and Curiouser!
Just to be sure, I went back and tested your suggestion in a demo
project based on the default "Hello Sailors" new project template.
Here I pass the c++ property cppproperty with the value "Hello World".
In the QML FirstPage this is concatenated to the "Hello Sailors" label
text.
I still get this error:
file:///opt/sdk/setContextPropertyDemo/usr/share/setContextPropertyDemo/pages/FirstPage.qml:34: ReferenceError: cppproperty is not
defined
Yet the app displays "Hello Sailors: Hello world".
So a property can be passed as you suggested, it can be used. The
error must be wrong!
Chris
P.s you test the same by creating a default new Sailfish project, and
replacing the main.cpp and FirstPage.qml with the code below.
//start main.cpp
#include <QGuiApplication>
#include <QQuickView>
#include <QQmlContext>
#include "sailfishapplication.h"
Q_DECL_EXPORT int main(int argc, char *argv[])
{
QScopedPointer<QGuiApplication>
app(Sailfish::createApplication(argc, argv));
QScopedPointer<QQuickView> view(Sailfish::createView("main.qml"));
view->rootContext()->setContextProperty("cppproperty", "Hello world");
Sailfish::showView(view.data());
return app->exec();
}
//end main.cpp
//start FirstPage.qml
import QtQuick 2.0
import Sailfish.Silica 1.0
import Sailfish.Silica.theme 1.0
Page {
id: page
// To enable PullDownMenu, place our content in a SilicaFlickable
SilicaFlickable {
anchors.fill: parent
// PullDownMenu and PushUpMenu must be declared in
SilicaFlickable, SilicaListView or SilicaGridView
PullDownMenu {
MenuItem {
text: "Show Page 2"
onClicked: pageStack.push(Qt.resolvedUrl("SecondPage.qml"))
}
}
// Tell SilicaFlickable the height of its content.
contentHeight: childrenRect.height
// Place our content in a Column. The PageHeader is always
placed at the top
// of the page, followed by our content.
Column {
width: page.width
spacing: Theme.paddingLarge
PageHeader {
title: "UI Template"
}
Label {
x: Theme.paddingLarge
text: "Hello Sailors: " + cppproperty
color: Theme.secondaryHighlightColor
font.pixelSize: Theme.fontSizeLarge
}
}
}
}
//end FirstPage.qml
Zitat von "Martin Grimme" <martin.grimme at gmail.com>:
> Hi,
>
> you don't want to set the context property on the
> QmlApplicationViewer, which was dead Nokia code to target Symbian and
> Harmattan, anyway.
> QmlApplicationViewer was derived from QmlView, where it got the
> rootContext() method from.
>
> With Qt5, QmlView was renamed to QQuickView. And when using the
> functions from sailfishapplication.h, you get a QQuickView*, e.g.:
>
> QScopedPointer<QQuickView> view(Sailfish::createView("main.qml"));
> view->rootContext()->setContextProperty("platform", platformId);
>
>
> Martin
>
>
> 2013/8/4, christopher.lamb at thurweb.ch <christopher.lamb at thurweb.ch>:
>> Hi all
>>
>> What is the recommended way to pass simple c++ properties from the
>> main.cpp to the QML part of a project using the Qt 5 Alpha?
>>
>> In the good old days of the first Alpha, I used to do this Harmattan
>> style using
>>
>> QmlApplicationViewer viewer;
>> viewer.rootContext()->setContextProperty("platform", platformId);
>>
>> This would make the c++ property platformId available to my qml code
>> as the property platform.
>>
>> Now with Qt5 / Alpha 2 the QmlApplicationViewer is no longer created.
>>
>> The tutorial linked below suggests that the QmlApplicationViewer files
>> could be ported to Qt5, so I guess I could grab these files from an
>> old Harmattan project and do that.
>>
>> https://qt-project.org/doc/qt-5.0/qtdoc/portingqmlapp.html
>>
>> But somehow that feels like carting old baggage around.
>>
>> Is their a Sailfish native way of doing the same?
>>
>> Thanks
>>
>> Chris
>>
>>
>>
>>
>> _______________________________________________
>> SailfishOS.org Devel mailing list
>>
>
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