AppActions signal is not emitted !

[majidkamali1370]

Hi @benlau
I want to use Flux in my app. I followed the guides, but I have a problem.
AppActions signal is not called at all !!!

in my view:

import "actions"
...
    onCheckedChanged: {
        if(checked)
            AppActions.selectContractor(contractorId)
        else
            AppActions.unselectContractor(contractorId)
    }
...

AppActions.qml

pragma Singleton

import QtQuick 2.7
import QuickFlux 1.0
import "."

ActionCreator {
    signal selectContractor(int cId);
    signal unselectContractor(int cId);
}

ActionTypes.qml

pragma Singleton

import QtQuick 2.7
import QuickFlux 1.0

KeyTable {
    id: actionTypes;
    property string selectContractor;
    property string unselectContractor;
}

my store:

pragma Singleton

import QtQuick 2.0
import QuickFlux 1.0
import "../actions"

AppListener {
    Filter {
        type: ActionTypes.selectContractor

        onDispatched: {
            console.log("selected contractor " + message.cId)
        }
    }
    Filter {
        type: ActionTypes.unselectContractor

        onDispatched: {
            console.log("unselected contractor " + message.cId)
        }
    }
}

But nothing is printed in console !!!
Even no error is reported
I have qmldirs files in actions and stores folders
What am I doing wrong?

Thanks

[benlau]

Your code looks fine. Did you tried the example code in examples/ folder. Do it works? And what is your OS and Qt version?

[majidkamali1370]

I checked both todo and photoalbum and both are working
Using Arch linux (kernel 4.4.5)
Qt 5.7.0 installed via offline installer

[benlau]

I have no idea what was happening in your code. Do you mind to share your code to me?

[majidkamali1370]

I can not share that with you, because it's not my own code, sorry :-(
But I explain you everything in code.
First, we have a utility library that we put useful and reusable components isnide it, I added QuickFlux in it and included pri file in library project pro file.
https://github.com/benlau/quickflux#installation-instruction-without-qpm
I just changed quickflux.pri to QuickFlux.pri, nothing more :-)
Then, I imported QuickFlux version 1.0 into Qml files of main project.
Main project has following structure (inside project folder):

• assets
  • qml
    • actions

      AppActions.qml
      ActionTypes.qml
      qmldir

    • stores

      ContractorInsertStore.qml
      SelectedContractorStore.qml
      qmldir

    • OTHER QML FILES

two stores are not related to eachother, so I did not create adapters folder and those files.
I first created SelectedContractorStore.qml and related ActionTypes and AppActions. When I tested it, It worked in a random way. sometimes with some parameters it worked, but sometime it did not.
When I added ContractorInsertStore.qml, none of them are working at all.

ActionTypes.qml full source code:

pragma Singleton

import QtQuick 2.0
import QuickFlux 1.0

KeyTable {
    id: actionTypes;

    property string changeHelp;
    property string selectContractor;
    property string unselectContractor;

    property string loadContractorFromDatabase;
    property string saveContractorToDatabase;
    property string setContractorMoshakhasat;
    property string setContractorTavanFanni;
    property string setContractorMali;
    property string setContractorTajhizat;
    property string setContractorSayer;

    property string removeContractorTavanFanniFromList;
    property string removeContractorTajhizatFromList;
    property string removeContractorSayerFromList;
}

qmldir in actions folder

singleton ActionTypes 1.0 ActionTypes.qml
singleton AppActions 1.0 AppActions.qml

qmldir in stores folder

singleton SelectedContractorsStore 1.0 SelectedContractorsStore.qml
singleton ContractorInsertStore 1.0 ContractorInsertStore.qml

AppActions.qml full source code:

pragma Singleton

import QtQuick 2.0
import QuickFlux 1.0
import "."

ActionCreator {
    signal changeHelp(string text, string state);

    signal selectContractor(int cId);
    signal unselectContractor(int cId);

    signal loadContractorFromDatabase(int cId);
    signal saveContractorToDatabase(int cId);
    signal setContractorMoshakhasat(var d);
    signal setContractorTavanFanni(var d);
    signal setContractorMali(var d);
    signal setContractorTajhizat(var d);
    signal setContractorSayer(var d);

    signal removeContractorTavanFanniFromList(int index);
    signal removeContractorTajhizatFromList(int index);
    signal removeContractorSayerFromList(int index);
}

In view, I've checked input parameter and they are valid.
Thanks :-)

[majidkamali1370]

I have another question. Can I use this library in C++?
I mean e.i. create classes in c++ that act as stores, or AppActions etc

[majidkamali1370]

I tested the code in windows with mingw compiler and Qt 5.7.0
Gives me following error:
qrc:/assets/qml/main.qml:4 module "QuickFlux" is not installed
I even called registerQuickFluxQmlTypes manually, but gives me that error again.

In linux, there is no error, but does not work.

PS: I had to add Q_DECL_EXPORT before QuickFlux class names.

[benlau]

First, we have a utility library that we put useful and reusable components isnide it, I added QuickFlux in it and included pri file in library project pro file.

Do you mean to use QuickFlux in a plugin library?

I mean e.i. create classes in c++ that act as stores, or AppActions etc

QFAppDispatcher is the C++ implementation of AppDispatcher. It is possible to send and receive action message in C++. Moreover, it has an utility function , QFAppDispatcher::singletonObject(), to obtain the instance of QML singleton object from C++ . So the answer should be possible, but I am not sure is it a good approach.

I usually just declare AppActions / stores in QML. Then obtain the instance by the singletonObject() in C++

QFAppDispatcher Class | QuickFlux 1.0

[majidkamali1370]

Do you mean to use QuickFlux in a plugin library?

It's not a plugin, but a simple Shared library. In main project, I added library via right clicking in .pro file and selecting 'Add Library', then selecting .so file path and include folder of that library.

[benlau]

I never tried to use it in a shared library but I don't see any reason that not able to do so. Any chance that you have two QQmlEngine instance running?

[majidkamali1370]

I don't think so. I use QQmlApplicationEngine.

...
QQmlApplicationEngine engine;
engine.addImageProvider("manpower", new ManPowerImageProvider());
engine.addImageProvider("slideshow", new SlideShowImageProvider());
engine.rootContext()->setContextProperty("DB", db);
engine.load(QUrl(QStringLiteral("qrc:/assets/qml/main.qml")));
return app.exec();

That's what I have done with QQmlApplicationEngine. (in main function)

[benlau]

Then I have no idea what is the problem. Sorry

[majidkamali1370]

I included pri file in main project file to use QuickFlux directly in my project, but it does not work neither.
It should be a serious problem in my code.
Excuse me for bothering you.
Thank you