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QUESTION
I am trying to write a plugin that contains some QML files and some C++ classes that provide lower-level functionalities and communicate with another application. They are used by the QML components. I want to be able to manage the life time of these C++ objects from QML (i.e. they should be created when the QML file is loaded and destroyed when QML is destroyed), while still being able to mock the C++ objects.
I tried a few different approaches so far. Ideally, the result will be that I can use qmlscene
on the QML file I want to edit and have a dummydata
folder next to that file which contains the mock for the instantiated C++ class.
If I try that by using qmlRegisterType
in a plugin class that inherits from QQmlExtensionPlugin
(similar to the example in https://qmlbook.github.io/ch17-extensions/extensions.html), and I pass the resulting library to qmlscene
, the QML file will not use the mock, but instantiate a C++ object instead. This means that sometimes, I need to start up a fair bit of logic to get some mocked data into my QML file.
It seems like the example in the "QML Book" suggests to completely design the QML component with a mock before introducing any C++ to QML. Is there a way to do that more sustainable? I guess, I could avoid using qmlRegisterType
for a C++ class that I want to mock for a while, by commenting out the according line, but I would like to not have to do that.
The other approach I tried was using QQMLContext::setContextProperty
from a central C++ controller class. That enables me to pass the C++ object to QML from C++ and also use the dummydata, however the object's lifetime will not be managed by the QML component, but from C++. Also, each class should potentially be instantiated multiple times and connecting signals properly is pretty error-prone. This is what I found so far:
ANSWER
Answered 2019-Dec-10 at 13:45The way I solved this issue is as follows:
The actual production application will use a C++ plugin, containing only C++ files and no QML.
For mocking, there is a QML module with the same name as the C++ plugin, containing QML files which provide the same interface as the equivalent C++ classes. This module is passed to qmlscene
in addition to the general QML includes.
If the C++ class header looks like this:
QUESTION
I am writing a small application using Qt
and QML
that uses the example in the Qt documentation WebEngine Quick Nano Browser.
In this example I am trying to access to my email. I can do it, but I am trying to enter username and password automatically so that I can instantly log into my emails.
Basically as an example, after launching the application (my email address is hard-coded) I can see the username
page of gmail
, but here I have to type my username to access to the next page that has the password
::
Here I have to type my password
:
Only after doing that I can access to my email.
The Expected result would be as soon as I run the application, I would like to go straight to my email without inputting username
and password
The code that I am running is the following:
...ANSWER
Answered 2019-Nov-17 at 03:36Do not use the example WebEngine Quick Nano Browser as I see it unnecessary and only distract from the background objective.
The logic is to understand how google login works, in this case you must find a way to obtain the elements of the DOM using javascript for example through id, class, name, etc. and modify it according to the desired logic. Also note that the url changes so that in each one a different script must be executed.
Considering the above, the solution is:
QUESTION
I am new to Qt/QML. I am learning from QML book, I am trying an example to add / remove an element to simple ListModel. After clicking "Add Item", onClicked method in MouseArea of Rectangle is not getting invoked. OnClicked method of delete is in delegation component is working fine.
Here is the code
...ANSWER
Answered 2018-Jun-20 at 09:50You are anchoring MouseArea
to ListModel
QUESTION
Edit2: The accepted answer demonstrates how the warning should not pose that much of a problem. I have changed the topic of the question to better reflect what is in fact answered there. It did not solve the question of Binding refered to in Edit1, but as the warning does not worry me anymore the primary reason for using Binding is no longer relevant.
Edit: As per Praveen Kumar's suggestion I created a MVCE to illustrate the problem. However, the code now seems to work as intended! However, because the method used has an explicit warning in the documentation, I have added the condition to the question that the solution has to involve the Binding QML Type, which is still something I do not understand how to do.
Modified original question: I have some objects that I create dynamically in QML, and I would like to bind some of these objects' properties to properties of static objects.
I have used a ListModel to manage the dynamically created objects as suggested here.
Using this ListModel I have no problem looping through all the objects and accessing them.
The same site suggests using the Binding component for binding properties, but I do not understand how to use it.
I am able to make this work without the Binding type as the following code demonstrates:
main.qml
...ANSWER
Answered 2017-Aug-05 at 15:47I am sorry that I have so little time to think about what you try... I don't really get, why you should add visual objects to a ListModel
, but there might be reasons...
As far as I understood is your problem with the warning:
Warning: The returned object is not guaranteed to remain valid. It should not be used in property bindings.
so I want to tell you that you should not experience much problems because of this warning.
So let's see why (and what you are doing)
QUESTION
I'm going to practice this example and for that I created a Qt Quick Console 2 Application project named Main2 using Qt Creator 4.3.0 on a windows 7 machine.
The code for main.qml looks like this: and I get the following errors in the Application Output window:
The program has unexpectedly finished.
C:\Users\Abbasi\Documents\QML\Main2\Main2\build-Main2-Desktop_Qt_5_9_0_MinGW_32bit-Debug\debug\Main2.exe crashed.
Starting C:\Users\Abbasi\Documents\QML\Main2\Main2\build-Main2-Desktop_Qt_5_9_0_MinGW_32bit-Debug\debug\Main2.exe...
QML debugging is enabled. Only use this in a safe environment.
What is the problem with the paths or anything please?
The images are in a folder named images on the Desktop. How to move them to a folder under the project, a step-by-step means please?
...ANSWER
Answered 2017-Aug-04 at 09:39- copy the images folder to your project folder
- right click on your project - add new - Qt - resource file -
images.qrc
- right click on that - add existing files, goto /images and select what you want to add
- alternatively, you can directly use the "add existing directory" option to add all files in a directory
Then from QML you simply:
QUESTION
I want to have a Swipeview, inside a swipeview a list od widgets (buttons). Everything has to be create dynamically, because there can be one screen or five, or one widget or more. It can be added via drawer (in future). Add screen on drawer adds one more screen. Add widget adds one widget on current screen. I think it should be as on image. I was trying to make this like here. My attempt:
main.qml
...ANSWER
Answered 2017-Feb-08 at 07:25I don't know if that what you need but here is example of totally dynamically created SwipeView
:
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