LinuxQuestions.org
Latest LQ Deal: Linux Power User Bundle
Go Back   LinuxQuestions.org > Blogs
User Name
Password

Notices


Old

GUI coding. A peek at run-time inheritance (method lookups)

Posted 04-20-2012 at 09:23 AM by rainbowsally
Updated 04-20-2012 at 09:26 AM by rainbowsally

GUI coding. A peek at run-time inheritance (method lookups)

In previous blog entries we built QT's example/desktop/screenshot application and did a bit of tracing with a debugger.

Let's take a look at the metaobject definition file (moc_screenshot.cpp) next.

This is where QT implements a class' method inheritance. It looks up 'methods' from the widget's parent first, then if parent doesn't handle the '_id' we try it here, and if we don't handle it...
Member
Posted in Uncategorized
Views 370 Comments 0 rainbowsally is offline
Old

New digital tune / gFifteen version 1.0

Posted 04-20-2012 at 02:34 AM by hydraMax (Bits and Pixels)

I finally was able to get a power adapter for my old CASIO keyboard, plus a MIDI adapter. With that and some RG editing I was able to produce this little tune:

https://frigidcode.com/digital-music/m05/m05.ogg (Ogg Vorbis)
https://frigidcode.com/digital-music/m05/m05.mp3 (Mp3)

*****

This is somewhat old news, but I should mention that gFifteen version 1.0 is available, with three additional tile sets for variety. Debian packages are available for...
Member
Posted in Uncategorized
Views 394 Comments 0 hydraMax is offline
Old

Master Command history in Linux Bash

Posted 04-19-2012 at 08:16 PM by stretchedthin
Updated 04-19-2012 at 09:35 PM by stretchedthin

Before you learn any commands in Linux, get to know how you can make the most of the history functions in Bash. This will save you and your fingers a lot of wear and tear. Learning this and making sure your working in a terminal emulator that has good copy past functionality and your going to find the command line a pretty comfortable place.
Master Command history in Linux Bash
Member
Posted in Uncategorized
Views 423 Comments 0 stretchedthin is offline
Old

Cut and paste

Posted 04-19-2012 at 05:57 PM by peonuser
Updated 04-19-2012 at 06:32 PM by peonuser (typos)

The "legacy os" people pride themselves in how they support pentium 3 and pentium 4 systems. Funny. We still use linux on pentium I and pentium II machines.

Thanx to all the people who have viewed http://www.instructables.com/member/computothought/. Over 236,000 views now.

Trying to think of a super simple example of cut and paste for a class. Here is what I came up with:

Play pretend here for a second. You are a new accountant for a company...
Member
Posted in Uncategorized
Views 452 Comments 0 peonuser is offline
Old

GUI coding. The 4 main parts of a typical GUI toolkit

Posted 04-19-2012 at 02:34 PM by rainbowsally
Updated 04-19-2012 at 02:51 PM by rainbowsally (clarification of 'metaobject' purpose in last line)

Let's start slow.

First of all, most of the GUI toolkits including QT4 are set up in the following steps, and in this order.
  1. Create an application, possibly with commandline args. (If not created explicitly this 'application' thing will already exist somewhere.)
  2. Create a main widget with the 'application' thingie as its parent.
  3. Show the main widget.
  4. Run the application event loop.

The 'application' is the main event dispatcher which translates X events...
Member
Posted in Uncategorized
Views 394 Comments 0 rainbowsally is offline

  



All times are GMT -5. The time now is 10:12 PM.

Main Menu
Advertisement
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration