Category Archives: Qt

New GUI for kdev-cppcheck

Hi there!

As you all probably know CppCheck is static code analyzer tool for C and C++. KDevelop has a plugin that provides a front-end for it, and the plugin is called kdev-cppcheck.

The good news is I’ve updated it’s GUI and now it uses the KDevelop Problem Checker Framework.

In the past it used to have it’s own toolview, where it showed issues in different formats (flat issue list, grouped by files, grouped by issue severity), based on the settings set in a KCM module.

Here’s a screenshot showing and example of this


What I’ve done is break up that KCM module, and create a per project settings window, and a general global settings window. The global settings window allows you to set the location of the cppcheck tool


The per project settings window allows one to set the rest: parameters, and what should be checked


Also the results area now shown in the problems toolview, just like problems found by the background parser, in it’s own tab.


Here’s a video showing the workflow

New GUI for kdev-krazy2

Hi there!

First of all let me introduce some concepts for readers who are unfamilair with them.

What is krayz2?

Krazy2 is a set of code tests (basically static code analysis) for KDE developers.

What is kdev-krazy2?

kdev-krazy is a plugin for KDevelop, that provides a frontend for Krazy2, so it can be run directly from KDevelop. The resulting issues also show up in KDevelop.

What’s changed?

I’ve given some love to this plugin lately: First I ported it to KF5 so it can run in the latest KDevelop. Now I’ve changed it’s GUI so it now uses the new KDevelop Problem Checker Framework.

Up until now the plugin had it’s own toolview. That’s where settings could be changed, analysis started, and that’s where the issues showed up. Let’s see some screenshots!

The first one shows the main KDevelop window, with the plugin loaded, showing the krazy2 toolview docked in the bottom (fairly large picture, feel free to click).


Clicking either the “Select paths” or “Select checkers” buttons shows settings dialogs, not surprisingly you can select paths and chekers in them. The next 2 screenshots shows those.



Finally the result of the analysis is shown in the toolview


All this was in the past. Now the settings can be changed in the per project settings window



The analysis can be started from the Run menu.


The results show up in the problems toolview, the same way that problems detected by the background parser, in a separate tab


Here’s a video showing how it all works


KDevelop Checker Framework – pushed

Hi there!

I’m pleased to announce that the KDevelop Checker Framework has been pushed to the KDevPlatform repository. Here are some details about it:

GUI changes

  • Moved ProblemModel to shell
  • Reworked the Problems toolview. Now it works like this:
    • ProblemModels are added to ProblemModelSet.
    • ProblemReporterFactory makes instances of ProblemsView.
    • ProblemsView takes the models from ProblemModelSet (also subscribes for updates about them, so if one is added or removed it can add/remove their views) and it provides a tabbed widget where the views for them can be added. It creates instances of ProblemTreeView which show the problems in ProblemModel, and adds them to the tabs. Also the tabs shows the number of problems in the ProblemModels.
    • The toolview will only add actions that are supported by the model (for example: filtering, grouping, reparsing, showing imports. Obviously reparsing doesn’t make sense for runtime problem checkers)

See the video:

  • First it shows that the “old” problem reporter still works as intended (which also uses the new code now)
  • Then from 1:07 onward it shows an example problem model/view working with randomly generated test data.
  • It shows the features of the new model(s), that is filtering by files/project and issue severity.
  • It also shows the grouping support (grouping by severity, and path.

ProblemModel details

  • Broke up ProblemModel into 2 parts
    • Base ProblemModel that provides the QAbstractItemModel interface for views and can use various ProblemStores to store problems. By default it uses FilteredProblemStore.
    • ProblemReporterModel is basically the old ProblemModel that grabs problems from DUChain, it’s a subclass of ProblemModel.
  • ProblemStore simply stores problems as a list (well technically it stores them in a tree, but it only has 1 level, so it’s a list). There’s no filtering, no grouping. It’s perfect for ProblemReporterModel since it does filtering itself when grabbing the problems from DUChain.
  • FilteredProblemStore DOES filtering, and grouping itself. It stores problems in a tree (ProblemStoreNode subclasses). The tree structure depends on the grouping method, which is implemented with GroupingStrategy subclasses.
  • Moved WatchedDocumentSet and it’s subclasses from ProblemModel to ProblemStore, as it is really a detail that the model itself doesn’t need, however ProblemStore which stores the problems needs it actually.
  • Created a new Problem class, DetectedProblem and moved both this and the “old” Problem class in under the IProblem interface. The intent here was to create a class with a clear interface for problems, which ProblemStore can simply store. I wanted to eventually clear the problems out of DUChain and replace the “old” Problem class with it. However I realized that it’s not practical because of the “show imports” feature which shows the problems from imported contexts. Unfortunately DUChain is the class that knows those, and it’s way too much work to get it out from it. Not to mention it doesn’t even make sense, since it’s really something that logically belongs there.

Using this new system is fairly straightforward:

All one has to do is instantiate a model, add it to the model set:

KDevelop::ILanguageController *lc =  KDevelop::ICore::self()->languageController();
KDevelop::ProblemModelSet *pms = lc->problemModelSet();
m_model = new KDevelop::ProblemModel(this);
pms->addModel(“Test”, m_model);

Then later inject problems into it:

KDevelop::DetectedProblem *p = new KDevelop::DetectedProblem();
p->setDescription(“Some message”);

Here’s a class diagram about the relevant classes:


kdev-krazy2 ported to KF5

Good news everyone!

The KDevelop frontend for Krazy tools has been ported to KF5, so it now works with the KF5 version of KDevelop.


KDevelop – Checker framework

Hi there!

So I got a slot for GSOC2015 to implement a “Checker framework” for KDevelop, therefore I have been and I will be working on it during the summer.

The project has 3 phases

  1. Create a framework that problem checker plugin developers can push issues into, so that they don’t have to create their own infrastructure for it (like models, views, toolviews for the views, etc)
  2. Update some of the already existing plugins to use this framework (kdev-krazy, kdev-cppcheck, kdev-valgrind)
  3. Implement 2 new checker tools using the framework (clang-check, pylint).

A little bottom-line explanation:

This framework will basically mean a common (obviously subclassable) model that can be used for storing problems, some infrastructure for holding such models, and views. The model will be a refactored, cleaned up version of the current ProblemModel that is used by the problem reporter plugin. The toolview of that plugin will also be cleaned up and refactored, and provide a better view for the model(s).

Up to now I’ve been already working on creating this framework.

  • Now it is a tabbed view, and the tabs show the number of problems in the currently shown view
  • I’ve also created a class that holds problem models, and those models automatically get a view in a tab in the problem toolview

I am now in the process of refactoring the ProblemModel.

Here are two screenshots comparing the “old” toolview with the “new” one:

20150327_000002297 20150531_000002772

Upgrading kdevelop’s valgrind plugin to KF5

I’ve started to upgrade KDevelop’s valgrind plugin ( kdev-valgrind ) to KF5 so that the KF5 version of KDevelop can use it.
In short ‘Valgrind’ is a dynamic analysis tool that allows you to check your programs for memory errors, threading errors in runtime. It also allows you to cache and call profile. So it’s very useful. Without such tools it would be almost impossible to detect and debug these kinds of errors. ( other than reading all the code and spotting it of course )

Kdev-valgrind is a plugin for KDevelop, that integrates some of this functionality into KDevelop. I did not create the plugin I am just merely updating it, because it is very very important to have!

It took me some time, but finally I can compile and load it as the screenshots below will show. All I had to do was basically update it’s cmake project file with the KF5 libraries instead of the KDE4 ones, change some class/call references ( ok, lots of them ), and move away from the deprecated KDE widgets, in favor of the Qt ones. Very soon I will test it througly and then submit my changes for review to the KDevelop guys.



Youtube backup

Like I said in my earlier post, I had broken my youtube account.

My first idea of fixing the issue was starting a new channel, but since I have lots of playlists, I would have had to save them by hand and then create the playlists, and add the videos by hand. Which would have taken forever, and I’m also too lazy to do something so mind numbing,
Fortunately since then I’ve fixed the issue, so it’s no longer a problem, but I had the idea of writing software to automate this.
I’m proud to present YTBK – Youtube Backup, that does just this, automatically.
…or at least does it halfway, right now. You just enter the channel name and it pulls your playlists, and the contents of the playlists ( the URLs only, not the videos themselves ). It can also save these data to a text file.

Later I plan on making it capable of restoring the lists to a youtube account!

Here’s a video of it:

Also since I wrote it using the Qt framework, it’s cross platform, so it can be built on both Windows, Linux, Mac and other platforms as well.

Here’s a pic of it running in a Ubuntu 14.04 LTS VM ( click to enlarge picture )


You can try the Windows version if you’d like by downloading it from here:

Creating new GUI with Ryzom Core Studio GUI Editor plugin

Good news everyone!

I’m proud to announce that the GUI Editor has taken a giant leap forward!
Until now it was only possible to modify an existing GUI with it, but from now on it will also be possible to create a brand new GUI from scratch!
While this doesn’t mean that it’s finished, and ready for production use, it’s like I said a giant leap into the right direction!

Here’s a video showing the workflow for creating a new GUI and using it with Ryzom:


GUI Editor crash

I’ve been getting complaint about the Ryzom Core Studio GUI Editor plugin crashing instead of rendering what it should, so I did a little investigation. Apparently if you try to render OpenGL into a simple QWidget it will crash the driver ( at least the Intel one I have on my lappy ).
The solution: use QGLWidget instead of QWidget on Linux, even if you don’t use the rendering features of it.

Now it works just fine:

The screen shows it working on my HP 6910p laptop, running XUbuntu 14.04.