#qtquick

What the Heck is the Strict Comparison Operator

Hi Brad I’m new to Qt Quick and while I’ve been learning the QML scripting language I’ve noticed that often in coding examples I’ve seen people use three equals signs when comparing values instead of two. What the heck is that?

The comparison operators which use three characters vs. two are called the Strict Comparison Operator and is not new to QML but rather part of the ECMAScript standard.

For…

How to use Qt Quick’s TreeView

On July 1st Qt release version 5.5 which included a number of improvements and new additions to the framework. One of the new arrivals in this version is the much sought after TreeView QML type. In this tutorial I’m going to show you how to use the new TreeView to present data which is organized in a tree.

You may be asking wait Qt’s had a tree view for a while now, that is you’d be saying that…

Qt Quick Performance Tip – Batches

​In this blog series I’m listing out different performance tips and tricks for Qt Quick to make sure you’re getting the best performance out of the scene graph renderer. In this post let’s talk about how the default render in Qt Quick batches draw commands to OpenGL.

When you write an application in Qt Quick you are using OpenGL to render the elements in your user interface on screen. That is…

Qt Quick Performance Tips – Rectangles

In this blog series I’m listing out different performance tips and tricks for Qt Quick to make sure you’re getting the best performance out of the scene graph renderer. In this post let’s talk about Rectangles.

How is a Rectangle Rendered on Screen?

When you add a Rectangle element to your QML script the scene graph renderer draws it on screen by drawing four vertices (a point where two or more…

Qt Quick Performance Tips – Clipping

​In this blog series I’m listing out different performance tips and tricks for Qt Quick to make sure you’re getting the best performance out of the scene graph renderer. In this post let’s talk about Clipping.

All QML components that extend from Item ( i.e. QDeclarativeItem ) has a property called clipping. This property ​tells the scene graph not to render any child elements which extend beyond…

Dynamic Menus: How to Populate a Menu from a Model in QtQuick

In this tutorial I’ll walk you through how to create a dynamic menu by populating it via a model.

A short while ago I ran into a situation where I needed to add a context menu to an application and to do this I choose to simply leverage the existing Qt Quick Control Menuso I wouldn’t have to deal with making sure the menu opened starting at the point where the user clicked the mouse nor have to…

How to make a QML Component a Singleton?

In this tutorial I’ll walk you through how to define a custom QML Component as a singleton.

Currently I’m working on a rather large Qt Quick application which will be deployed on an embedded device. I’m starting to notice performance issues as we add more and more screens to the application. I decided to run the QML Profiler that is part of Qt Creator and one of the things I noticed was that one…

How to resolve Component naming conflicts in QML

Hey Brad, I’ve been using Qt Quick for a bit now and have created a whole bunch of custom controls. I recently upgraded to the latest version of Qt and now I’m running into issues because Qt added a bunch of new Qt Quick Controls and a few of them use the same name as my custom controls. How do I resolve these naming conflicts?

I ran into this very same issue my self not to long ago and I’ve got…