Changes between Version 6 and Version 7 of qt

Timestamp:

10/13/2021 08:16:21 PM (3 years ago)

Author:

Tim Harvey

Comment:

added touch display example

qt

@@ +1 @@
+[[PageOutline]]
+
 = Qt For Embedded Linux
 
@@ -78 +80 @@
 In order to use EGLFS you need to be using a kernel with the etnaviv KMS/DRM driver enabled, libdrm (userspace lib to interface with Linux DRM drivers), and libmesa. Note that the etnaviv driver uses cma memory - if you get memory allocation errors when trying to run applications try increasing the cma memory via the kernel command-line.
 
+For more info see:
+ - https://doc.qt.io/qt-5.12/embedded-linux.html#platform-plugins-for-embedded-linux-devices
 
 [=#linuxfb]
@@ -164 +168 @@
 
 
-== User Interface Design with QT
+[=#fingerpaint]
+== Qt Fingerpaint Touchscreen Example
+Qt has a [https://doc-snapshots.qt.io/qt5-5.12/qtwidgets-touch-fingerpaint-example.html fingerpaint example] app demonstrating how to use touch input
+
+Examples:
+ * Ubuntu Focal 20.04:
+{{{#!bash
+apt update && apt upgrade # always a good idea to keep up to date
+# install basic development requirements
+apt install build-essential git
+# install libevdev
+apt install libevdev2 libevdev-tools
+# install qt5 runtime and qml modules required
+apt install qt5-default
+git clone git://code.qt.io/qt/qtbase.git -b 5.12
+cp -r qtbase/examples/widgets/touch/fingerpaint .
+cd fingerpaint/
+qmake
+make
+# run using linuxfb backend
+./fingerpaint -platform linuxfb
+}}}
+
+For more details Qt Input see:
+ - https://doc.qt.io/qt-5.12/embedded-linux.html
+
+= User Interface Design with QT
 It is often best to consider QML instead of HTML5 for UI design. QML is much easier to use than HTML5 and is typically just fine for most user interface designs. QML has been designed for compsiting UIs and screen elements from the start while HTML5 had these things added to an existing standard meant for text rendering.