Problem with cross compiled code on raspberry pi
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Hello, I am having problems with a Qt GUI application I created. Basically I created the application in my ubuntu to check if it compiles and works properly, however, if I set up the cross compiler (followed one of your tutorials and tried a hello world which works properly) and execute my code in the pi the UI does not display properly and basically I cant do anything:
· Text disappears from buttons
· Mouse disappears from screen (therefore cant click buttons)
· Cant navigate buttons using tab keyAny clues? maybe I cant use .ui files in the pi and have to use qml? Thank you in advance.
2 Screenshots of what I get with the pi and what the program should actually look like:
!http://imageshack.us/a/img17/9986/img20130508093318.jpg!
!http://img825.imageshack.us/img825/2038/raspiestubuntu.png!
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Do you have fonts installed on the pi? Are the detected by Qt?
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I ran on the pi terminal the following code to check the detected fonts: "fc-list – lists fonts"
Changed the fonts of my program to DejaVu Sans (which was detected) and a few others, still nothing. Moreover there was a message in the terminal i hadn't noticed: "This plugin does not support propagateSizeHints()"I've been told that Qt5 has different rendering platforms, the standard for my compiled version is "eglfs", which is fullscreen EGL accelerated mobile application style. I need to run it another platform for example xcb or x11 with the command "./myprogram -platform xcb". Unfortunatelly i only have the following platform options and none of them work: eglfs,linuxfb,minimal,minimalegl,offscreen. I dont now how to install these, i'll google it see if i can find anything.
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I also ran into this and defining the size using pixelSize solved it, once I changed all my text rendering elements so that they would use pixelSize I was set to go.
However later on, I found that I was not being able to load fonts other than the default one and after I also ran into trouble when I started using TextInput elements with echoMode set to password as the stars (*) just wouldn't show.
Trying to solve my font loading problems I came up with the following solution.
I included the ttf files as a resource and then used a FontLoader, I'm not sure whether this works using absolute/relative paths directly instead of the qrc path, But since I found it to work with qrc I just kept it this way.
@FontLoader {
id: freeSansLoader
source: "qrc:///fonts/resources/fonts/FreeSans.ttf"
onStatusChanged: if (loader.status == FontLoader.Ready) console.log('Loaded')
}@After having declared the loader I can just directly write:
@font.family: "FreeSans"@
On text rendering elements (Text, TextEdit, TextInput).
A nice additional surprise after I worked around the font loading problem, was that those inputs with echoMode set to password now seemed to display the stars (*), pwetty cool.. one less bug to deal with....
Regards,
Wolf
