If a step is for a specific Qt version, that is mentioned. Here is a video of boot2qt booting straight in to my custom Qt app: The default apps of boot2qt 5.15 on my Raspberry Pi 4. The default app of boot2qt 6.2 running on the Raspberry Pi 4. With this referral link you'll get $100 credit for 60 days. You can also sponsor me by getting a Digital Ocean VPS. It means the world to me if you show your appreciation and you'll help pay the server costs. For Windows, Linux & Android, go check it out.Ĭonsider sponsoring me on Github. I'm developing a desktop monitoring app, Leaf Node Monitoring, open source, but paid. Here, but it works just as fine with less RAM. We end up with a boot2qt image for the Raspberry Pi 4. The guide also covers changing the default startup app to your own app and Qt Creator integration. The 5.15 build process is a bit convoluted due to a few upstream issues.
This guide covers both Qt 5.15 and Qt 6.2.
You can run your own Qt application on the Pi, full screen, it will boot right into it.
This boot2qt image can be written to an SD card and when booted up, the Raspberry Pi runs a software stack that integrates nicely with Qt Creator (the Qt IDE), for example, one click deployment to the device. We’ll also have to override the virtual method roleNames so that we can define the reference keywords that the View can use to access each one of these custom roles.In this guide we'll build a linux distribution for Raspberry Pi 4, using the Yocto project and the boot2qt stack provided by Qt. Have it extend the QStandardItemModel (which is a specialized version of the QAbstractItemModel) and define an enum that will specify some custom user roles. Call your new project QSortFilterProxyModel_Sample1.įirst lets add a new C++ class called MyViewModel which we’ll use as our source data model.
QSortFilterProxyModel_Sample1 illustrates this by having a button which will tell the source model to modify some entries (some even make the entry no longer pass the filter logic and therefore get removed from the proxy model) and show that the view updates to reflect the changes without any manual signal connection required.įirst create a new Qt Quick Application (*.pro) project, remember this is a type of project that can have both C++ and QML. You don’t have to manually connect these signals it is done for you out of the box. Note the base implementation set in the QAbstractProxyModel also listens to all the data changed signals that the source model can emit so that if new entries are added to the source model, or if existing entries are removed or modified the proxy model will relay those signals to the view so the view knows to update. By having your view access a QSortFilterProxyModel instead of the QAbstractItemModel directly you can present your view with a subset of the data actually in the source data model. Qt has a specialized class which inherits from the QAbstractProxyModel class called the QSortFilterProxyModel which can be used to sort and/or filter the data in the source model without effecting the source model it self. The QAbstractProxyModel as the name implies is a general base class with just enough implementation to satisfy the requirements of allowing the data to be manipulated without effecting the source. Where the QAbstractItemModel is used as a base class for the sole purpose of presenting a collection of data to the presentation layer it is also inherited by a specialized class called the QAbstractProxyModel whose sole role is to allow the data to be manipulated without affecting the source data model this way the source data model can be used by any number of different proxy modes and each proxy model can manipulate the data in different ways without effecting each other. The base class for all models that exist in Qt is called the QAbstractItemModel, this model class has all the required methods and their base implementation satisfies the minimum required to allow views to hook up to them. In Qt there are classes called models which implement interfaces that allows them to satisfy all the hooks required by the framework so that views can query them for data and so they can be notified when that data changes. We can do this via a Proxy Model such as the QSortFilterProxyModel. The different presentation views may only need to show a subset of that data In order to achieve this we need to present each View with a subset of the contents of the Data Model. Your Data Model may hold data that needs to be presented in a number of different ways. In Qt Quick you have a View and a Data Model where the Data Model holds the data that the View will present to the user.
In this tutorial I’m going to show you how to use Qt’s QSortFilterProxyModel to only present a subset of data to the presentation layer.