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QT4 Event preemption: mouse click to get object name

Posted 05-03-2012 at 11:30 AM by rainbowsally
Updated 08-06-2014 at 10:15 AM by rainbowsally

See also the experiment to dump properties.

Now that we have event preemption ability, let's get simple again and create ui application that can tell the name of a widget by clicking on it.

[It's simpler than you think but I have uploaded the sources and makefile in case my description of this process is too complicated or confusing.]
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Integrated KVM connector

Posted 05-02-2012 at 09:09 PM by Skaperen

We need a standardized integrated connector that supports ALL of the following in one connector:

1. Dual DVI data links for video up to 2560x1600
2. Single VGA compatible analog signal likes (as in DVI-A)
3. PS/2 keyboard connection
4. PS/2 mouse connection
5. USB

Then maybe the KVM switch market can get their act together.
Senior Member
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GUI Programming: QT4 Event Preeption Part 2-B (temp)

Posted 05-02-2012 at 08:38 PM by rainbowsally

Here's the code to run the examples and create a subclass of QApplication customized for our event preeption test. (See part 2-A)

file: src/utils.h
// utils.h

#ifndef utils_h
#define utils_h

#include <QObject>

// See explanation in utils.cpp
int lq_hash32(const char* name);

// See explanation in utils.cpp
typedef struct 
  int hashid; // computed once
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GUI Programming: QT4 Event Preeption Part 2-A (temp)

Posted 05-02-2012 at 08:32 PM by rainbowsally
Updated 05-04-2012 at 11:33 AM by rainbowsally (QA check failed ;-))

[Corrected hash algorithm to return -1 for null string (aka "") input. May 4, 2012]

Today's features
  • conditional compilation (OLD_SCHOOL vs. ?)
  • discovery of a potential recursion problem in preemptive event handling (QTextEdit)

This example is complicated enough to be but actually is not quite ready for prime time, but I do want to point out the advantage of creating hash values for speeding up text searches in tables of data. See the utils.cpp implementation...
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Unofficial Debs for libcsv

Posted 05-02-2012 at 08:31 PM by hydraMax (Bits and Pixels)
Updated 05-02-2012 at 08:33 PM by hydraMax

I've produced some unofficial debs for libcsv. libcsv is an pure ANSI C library for reading and writing CSV data. I've made the packages available because I am thinking about using libcsv in an upcoming project. The packages are available here:

I hope to have some RPMs available as well within a few days.
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Views 691 Comments 0 hydraMax is offline


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