Qt is an application framework originally created by Trolltech and currently managed by Digia. The KDE desktop uses the Qt framework for its applications.

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I can't open Qt 4 Designer on latest Ubuntu

I click the Icon, and it will flash but will not open. Qt Creator works, but I'm trying to use Python. I've tried remove and install a couple times, but still nothing. I have downloaded PyQt4, ...
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QML How can i store the value an user enters in a variable?

How can i store the value an user enters in a variable? For example i have this code TextField {width: 37; height: 19 var id: q1 ...
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1answer
17 views

how to resolve “TypeError: Cannot call method 'push' of null”

I'm a new qml programmer and I found my self in this problem that when I want to call a new page when clicked on a button it says: TypeError: Cannot call method 'push' of null I've tried everything ...
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24 views

Restore qt integration after removing KDE

Restore GTK integration after removing KDE; this shows how to remove the kde-theme for gtk, and now I want to do the same for qt-applications. I have tried qt4-qtconfig, and it does not work. Here is ...
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excel query in qt

I have a program to connect with excel file. my excel file contains usernames and passwords of users who has access Permission to application. in interface of the program i have two QlineEdit(one for ...
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1answer
23 views

How do I install things? Or, what's xcb and qt and how do they solve the riddles of my life?

tl;dr is at the bottom for those not wanting reasons, just questions. I have the latest TeamSpeak client downloaded from the site of the authors of said program. I've managed, after a load of ...
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1answer
21 views

Trying to make my sixaxis ps3 controller work on my computer for minecraft

Ok so I followed the steps on here and on steps 8 and 9 I got this g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DDEVDIR=\"/dev/input\" -DICON24=\"/usr/local/share/pixmaps/qjoypad/icon24.png\" ...
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Qt C++ windowMinimized no reaction on Ubuntu

Heloo all! Me and a friend are creating an app for linux, everyting works but the custom minimize button doesnt whant to work on Ubunutu 14.04, there is no reaction when presed clicked an so on. Any ...
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27 views

debug symbols for Ubuntu 12.04

I try to watch how programs work by running them by the 'Qt Creator' debugger. For better orientation I'd like to see also the system (core) utilities fully in the call stack window as I am used from ...
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1answer
27 views

Can both appmenu-qt and appmenu-qt:i386 be installed at the same time?

OK, so here's the backstory. Skype recently released version 4.3 on Ubuntu. It now has a menu bar, which it did not before. The only issue is that because it is 32-bit software, it's menu bar is not ...
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Memory Leak From Sqlite database in LINUX Qt

I know this question has been answered, but still i didn't get the right resolution of this problem. I am developing an application for ARM9 based microprocessor using UBUNTU 12.10. I have used ...
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1answer
47 views

emit signal with custom type objects array parameter from c++ and receive in qml

I would like to emit a signal from a Qt C++ class which includes a parameter that is an array of custom objects (inherited from QObject) and receive the parameter in its qml slot, but i'm afraid it is ...
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1answer
50 views

How to make a project of Krusader

An example for my general question An introduction to translating and debugging source code : I had installed the 'Qt 4 Designer' and I have downloaded the krusader-2.4.0-beta3.tar.bz2 file. Among the ...
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1answer
36 views

LD Library Path

I am not sure whether my LD_LIBRARY_PATH is working. I installed Qt5.2.1 on Ubuntu and tried to execute an application from the command line using sudo ./App1. ( App1 needs sudo access, hence I ...
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19 views

How do you change qt themes by hand?

I am running a light desktop with Fluxbox and trying not to install anything more than I absolutely have to. I was wondering how one would go about changing qt4 and qt5 themes by hand much like you ...
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1answer
35 views

Setting up Themes in LX-Qt

I recently installed LX-Qt on Ubuntu Server. Everything went fine, but there seems to be an issue with the themes. When a theme is set in "Qt Configuration" (currently "QtCurve"), it doesn't change ...
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1answer
35 views

Ubuntu SDK: How do I implement a “onClick” for an image in QML?

I have a background image for my page, and I want to implement a sort of page refresh when the background is clicked. However, I didn't find any actions for the image element in QT quick. What's the ...
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1answer
46 views

QML: Overriding a signal handler from other element

Is it possible to override an elements action (eg onTriggered() of a Timer) from within the onClick() of a button? Something like so-> Button { id: centerBtn ...
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QML: TextField horizontalAlignment not working for entered text in Ubuntu SDK

I'm a complete newbie to QML and QT, forgive me if this is a trivial question. I'm using the following code to center-align the text in a TextField. This does work for the placeholder text, but the ...
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14 views

cannot find -lQtMultimedia

Using QtCreator with Qt 4.8 I need QT += multimedia in my pro.file I have already installed qtmobility-dev. Still my multimedia package is not found. Why?
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1answer
43 views

Install old QtCreator on Ubuntu 14.04

I want to build my application on Ubuntu. The last versions have been tested and programmed under Windows, because it is a multiplatform application. Sadly, under Ubuntu the systray icon did not work ...
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1answer
16 views

Unable to access i18n in QML app's JS file

I'm having trouble importing the i18n library included in Ubuntu.Components 0.1 for use in a JS file. I initially ran into my question/problem while hacking on the 'Clock' Ubuntu Touch core app, but ...
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51 views

How to install Qt4.6 libraries on Ubuntu 12.04?

I use Ubuntu 12.04. I am working with Qt IDE. I need Qt4.6 libraries for supporting my applications. Instead of this Ubuntu 12.04 provide Qt Creator IDE based on Qt4.8.0 libraries by ...
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2answers
97 views

QML Qt 5.2 problem with mp4 video

I have qt 5.2(ubuntu sdk) installed on Ubuntu 14.04 When I try to run QML code: MediaPlayer { id: mediaPlayer source: "../path/test.mp4" autoPlay: true } VideoOutput { id: video ...
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run qt designer/qt assistant with commands designer/assitant respectively

I'm used to an environment where I run the qt designer/qt assistant simply typing designer/assitant in the terminal. I am talking about qt 4. I've been installing packages such as qtcreator and ...
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52 views

Systray not showing

I have an application called foo that runs as root. The foo calls system function to execute the other application which show tray icon using Qt. The Systray Icon Example in Qt is working properly ...
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42 views

How to fix no sound problem after startx in alsa sound driver

My development env is: OS: ubuntu 12.04.3 language: Qt 4.8.1 alsamixer ver: v1.0.25 I am using .xinitrc contents like this: alsactl restore rm -rf /tmp/.* clear while(true) do ~ => ...
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1answer
52 views

Build-Essentials installation failing

I am having trouble accessing the several critical header files that show to be a part of the build process. The "Ubuntu Software Center" shows "Build Essentials" as installed: Next I did the ...
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34 views

unable to run make during installation of kernel 3.3.6

desktop:~/Desktop/linux-3.3.6$ make xconfig make[1]: Warning: File `scripts/kconfig/.zconf.tab.o.cmd' has modification time 1.7e+04 s in the future CHECK qt * Unable to find the QT4 tool qmake. ...
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0answers
16 views

Qml HUD integration without MainView?

I'm working on an app with Qt Quick Components, I don't want to use any Ubuntu specific components because I want the desktop version of my app to be more portable than that (Qt 5.2 is enough of a ...
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1answer
66 views

Qt5-default package not found

I am trying to do: sudo apt-get installl qt5-default Reading package list... Done Building dependency tree Reading state information... Done E: unable to locate package qt5-default On a Qt-forum I ...
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1answer
45 views

Qt Audio Engine not in Ubuntu SDK

I am using Ubuntu 14.04. I installed Ubuntu SDK with no problems using the instructions on Ubuntu website. I created a new QML project. I want to create an app that uses Qt Audio Engine. Here is my ...
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2answers
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How to go back from a PageStack's Page to the parent tab in the UI Toolkit

So in a previous question I tried to use the Ubuntu UI Toolkit to nest a PageStack within the Tabs component. It seemed to work, but it had its quirks, so I'm now trying another option, which in ...
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2answers
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How to hide the header of the Tabs component

I'm writing an app using the Ubuntu SDK, and I've got a PageStack component inside aTabs component. When I load one of the pages inside the PageStack, it all works well, and in the header the name of ...
2
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1answer
138 views

Font rendering problems with QT applications in Xubuntu

I'm currently using Xubuntu 14.04 but the same problem is present in 13.10 and 13.04, and maybe in previous versions. I always install truetype fonts and remove the anti-alias. In all the GTK ...
2
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1answer
55 views

Weird error when launching VLC from command line

Does anyone know how to solve this error? I tried viewing the content of the files in question, but I can only see weird characters. cannot load module `/usr/lib/vlc/plugins/gui/libqt4_plugin.so' ...
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1answer
38 views

QML: How to do variables?

In QML, I am just looking for a way to do fairly simple variables: Bool String Integer
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87 views

Qt4 interface not working for VLC

This is what happens if I try to run VLC: main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface. main interface error: option qt-volume-complete does not exist ...
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Broken qt4 package and system cannot be upgraded

While trying to fix the 100% /boot partition full, the "qt4" package was inadvertently broken. Now when I try to fix Broken packages with "Synaptic package Manager", I get the error below: Is there ...
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1answer
53 views

Problems with GTK themes

A few weeks ago, I installed razor-qt on 14.04. everything was okay, but whenever i open a gtk application, it defaults to the elementary theme, as i had the pantheon de installed on it before. the ...
2
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0answers
72 views

Unity launcher, dash and menu fonts are not anti-aliased

I am running Ubuntu 14.04. After installing Qt4 settings manager and tinkering with it (changing the font face for Qt apps) I notice that unity launcher, dash and menu and date indicator fonts are not ...
2
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1answer
41 views

QML: QtQuick Extension Plugin - What is URI?

When starting a new Qt Quick Extension Plugin, it asks me to specify Object Class Name (Easy enough), but also something called URI. What does URI stand for? What does this project need URI for? ...
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28 views

What are the steps needed to implement a Qt class or member function into a QML project for Ubuntu-Touch?

Qt contains many classes and functions that are useful for a QML project, but not readily available. The existing solutions do not employ a method that is platform independent, thus it is unclear ...
2
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150 views

Multitouch in Qt

I've got a fresh install of Kubuntu 14.04 and Qt Creator/5.2.1, and I'm trying to get multi-touch working for the example applications like photosurface. My input device is an Acer T272HL 10 point ...
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232 views

Ubuntu 14.04 and 13.10 trouble installing apps

Hi have started using Ubuntu 13.10 about a month ago first time user, like it very much after playing around with different softwares like Draftsight, qt sdk virtualbox each one of these where ...
3
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1answer
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What is the difference between Ubuntu.Components and QtQuick?

QtQuick 2.0 Ubuntu.Components 0.1 Are two common imports when developing applications for Ubuntu. Are these classes? Can you import member functions this way? If yes, how can tell what member ...
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129 views

Using KDE - Application Menus Missing in Qt Apps

I have multiple desktop environments installed on my Ubuntu 14.04 installation, and am primarily using KDE (today). Here's the problem I've noticed. When I've been building some newer versions of ...
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5answers
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[Solved]Symbol lookup error: /usr/lib/i386-linux-gnu/libQtOpenGL.so.4: undefined symbol: _ZNK14QWidgetPrivate17hasHeightForWidthEv

I installed skype using several process in my newly installed Ubuntu 14. 04 64 bit... it shows a skype icon in dash... but when I click on it, nothings happens. What can I do? I tried almost ...
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Use SystemSettings 1.0?

I'm developing a new app that I need to use the SystemSettings module for (I need to get the device serial, IMEI and stuff). When looking for a way to get these numbers I came across Ubuntu System ...
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2answers
93 views

Difference between Qt Creator and Ubuntu SDK?

Having downloaded them both when I installed the Ubuntu SDK, I wonder if there is any tangible difference between the two, such as the libraries being employed.