Presentation for HawkTalk Webinar, July 2010. Focuses on optimised Qt development using Xgxperf, and discusses available classes in Qt for application/UI development.

1. Developing Qt applications on HawkBoard Prabindh Sundareson [email_address] July 2010

4. Qt Licensing Model Commercial LGPL v. 2.1 GPL v. 3 License Cost License fee charged No cost No cost Must provide source code for changes to Qt No, modifications can be closed Source code must be provided Source code must be provided Can create proprietary application Yes—no obligation to disclose source code Yes, if dynamically linked to Qt library No, application is subject to the GPL Support Yes, with valid maintenance agreement Not included, available separately Not included, available separately Charge for Runtimes Yes—in some instances* No, distribution is royalty free No, distribution is royalty free

5. The Qt Framework FB Cairo Qt API (Linux / WinCE) DirectFB Surface Managers X Window System/Mgrs Application Framework HW Device Tslib, Mouse GWES Input Device Manager Qt/e Qt/X XgxPerf GDI DDr a w Win32/ Windowing System

6. Typical Application Components Feedback to User (GUI) Application Event Handler(s) Application Event Loop Environment Input Events Output Changes Sensor User Input Events Mouse/ts Ex. Increase speed by calling driver interface ioctl Qt

8. Qt Application Classes

11. Basics of Qt - Widgets

21. Creating a Widget (old screenshot)

23. Integrating .UI files TEMPLATE = lib SOURCES = vslib.cpp export.cpp HEADERS = ../applicationmanager/common/applicationbase.h vslib.h FORMS = mainwindow.ui RESOURCES = resource.qrc VSApp::VSApp(QWidget* parent, QRectF inSceneRect, QGraphicsScene *scene, void* data): ApplicationBase(parent, inSceneRect,scene,data) { //Store the test data locally m_widgetTestInStruct = (TestTargetParamsStruct*)data; currTimerCount = 0; setupUi( this); } c lass VSApp : public ApplicationBase, private Ui::MainWindow Location - Xgxperf/vslib .pro .cpp .h

26. Pre-configured applications Test 0 - Industrial Automation blocks (Turbines, Boilers, Pipes, Text Info classes) Test 1 – Text + Pictures (PNG/VG/Colors) Test 2 – Involves GLWidget, needs powervr (not on HawkBoard) Test 3 – Webkit Browser Test 4 – Automotive Tacho Test 5 – Medical ECG Monitor Test 6 – Video Surveillance camera feed Monitor Test 7 – Sewing Machine UI

30. Qt vs Android vs Silverlight

33. Q&A

34. THANK YOU