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The Qt Architecture: Why use QML for iOS or Android Apps?
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This post shows how to save up to 80% of code by choosing QML as your main language.
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In fact, you can create full apps without even touching C++. While the Qt framework is C++ based, you can also code with QML and JavaScript. But a web view does not offer the performance, features and user experience of native apps. 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.Many tools rely on web technologies like JavaScript and HTML for mobile app development. 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.
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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.
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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.
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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.