More in general, always make sure you check the return value of findChild
to make sure it is actually finding something :)
On Fri, Jun 17, 2016 at 2:00 PM, Michael Terry <michael.te...@canonical.com>
wrote:
> Try adding:
> objectName: "dialButton"
>
> to dialButton?
>
> "id" is for inside-qml references. "objectName" is for findChild and ilk.
>
> On Fri, Jun 17, 2016 at 8:58 AM, Matthias Apitz <g...@unixarea.de> wrote:
>
>>
>> Hello,
>>
>> I'm trying to write my first QML/C++ app, so please be patient with me
>> :-)
>>
>> The C++ main.cpp has:
>>
>> ...
>> int main(int argc, char *argv[]) {
>> QGuiApplication app(argc, argv);
>> QQuickView v;
>> QUrl file = (QUrl) "myRoot/home/phablet/baresip-app/baresip.qml";
>>
>> v.setSource(file);
>> v.show();
>>
>> MyClass myClass;
>>
>> QObject *item = v.rootObject();
>> QObject *newButton = item->findChild<QObject*>("dialButton");
>> QObject::connect(newButton, SIGNAL(qmlSignal(QString)),
>> &myClass, SLOT(cppSlot(QString)));
>>
>> return app.exec();
>> }
>>
>> and the QML object is:
>>
>> import QtQuick 2.4
>> import Ubuntu.Components 1.3
>>
>>
>> MainView {
>>
>> Rectangle {
>> id: page
>> width: 540; height: 960
>> color: "lightgray"
>> border.color: "grey"
>> border.width: 5
>> radius: 10
>>
>> Text {
>> id: baresipTitle
>> ...
>> }
>>
>> ...
>>
>> Item {
>> id: dialButton
>> x: 10
>> y: 110
>> property alias cellColor: rectangle.color
>> property alias cellText: buttonText.text
>>
>> signal qmlSignal(string msg)
>>
>> width: 160; height: 50
>>
>> Rectangle {
>> id: rectangle
>> border.color: "blue"
>> color: "lightgrey"
>>
>> anchors.fill: parent
>>
>> Text {
>> id: buttonText
>> text: "Dial"
>> x: 8
>> y: 24
>> font.pointSize: 12
>> }
>> }
>>
>> MouseArea {
>> anchors.fill: parent
>> hoverEnabled: true
>> onEntered: rectangle.border.color = "blue"
>> onExited: rectangle.border.color = "green"
>>
>> onClicked: button.qmlSignal("Hello from QML")
>> }
>>
>> cellColor: buttonMouseArea.pressed ? Qt.darker(buttonColor, 1.5)
>> : buttonColor
>> }
>> ...
>> }
>>
>> The app starts fine but the C++ part does not find the "dialButton", it
>> says:
>>
>> Loading module: 'libubuntu_application_api_touch_mirclient.so.3.0.0'
>> QObject::connect: Cannot connect (null)::qmlSignal(QString) to
>> MyClass::cppSlot(QString)
>>
>> Sure, that I do something wrong, but what?
>>
>> Thanks for any help or pointer to help. The full project sources are
>> attached.
>>
>> matthias
>>
>>
>> --
>> Matthias Apitz, ✉ g...@unixarea.de, ⌂ http://www.unixarea.de/ ☎
>> +49-176-38902045
>> "Die Verkaufsschlager des Buchmarkts geben Auskunft über den Zustand
>> einer Gesellschaft bzw.
>> sind, was diese Zeiten angeht, Gradmesser fortschreitenden Schwachsinns.
>> ..." (jW 19.05.2016)
>>
>> --
>> Mailing list: https://launchpad.net/~ubuntu-phone
>> Post to : ubuntu-phone@lists.launchpad.net
>> Unsubscribe : https://launchpad.net/~ubuntu-phone
>> More help : https://help.launchpad.net/ListHelp
>>
>>
>
>
> --
> -mt
>
> --
> Mailing list: https://launchpad.net/~ubuntu-phone
> Post to : ubuntu-phone@lists.launchpad.net
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>
>
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