a Text Editor with line numbers...

[fullmetalcoder]

hi,
I'm working on a C++ IDE with build-in support for Qt4.
Basic GUI is working but QTextEdit does not match my requirements:
I'm looking for an editor which would show lines number, allow search and replace and so on...
QScintilla may have be fine but it hasn't been ported to Qt4 yet.
QSA implements a similar text editor but I have troubles customizing it!!!
Any ideas???

[elcuco]

can you post any code..?

I am loking for such beast myself

[fullmetalcoder]

still working on it when I've got time and nothing to post.

about IDE also:
how to customize a QTreeWidget (or QTreeView as well) so as to allow each item to have a working context menu???

[Corran]

Connect the customContextMenuRequested signal to a slot where you look at the x,y co-ordinates to find out which cell the menu was requested from using QTableWidget::itemAt(QPoint).

[elcuco]

If you cannot release code, then some questions instead:

How are you handeling the tabs->convertion (show tabs as 8 spaces, etc)
Are displaying the current line in another color?

What other goodies do you have implemented?

[fullmetalcoder]

Connect the customContextMenuRequested signal to a slot where you look at the x,y co-ordinates to find out which cell the menu was requested from using QTableWidget::itemAt(QPoint).

Thanks but I have already done it by myself. I asked the question before thinking about the answer!!!

Dear elcuco, your beast appeared to me!!!
Looks nice but still needs a little work.

If you cannot release code, then some questions instead:

How are you handeling the tabs->convertion (show tabs as 8 spaces, etc)
Are displaying the current line in another color?

What other goodies do you have implemented?

Let's describe the "Graal" I made starting from QSA's editor

DevEdit : inherits QTextEdit
- custom contextMenu
- some additional signals and slots for convinience

DevStatus : inherits QStatusBar
- additional slot to write right aligned message (in my case its colum and row)

DevLineNumber : inherits QWidget
- draws line number (note : taken verbatim from QSA)
- additional signals and slots are planned for integrated debugging purpose

DevEditor : inherits QWidget
- All the widgets described above are put into a QGridLayout and signals are properly connected to have those widgets working together
following signals are wrapped for convinience:
- QTextEdit's signals
- QStatusBar signal
- QTextEdit's scrollbar's signals

The description I give may not be very clear but you'll understand with the code.
I'm gonna post it during the week. Wait...

edit :
posted a screenshot.

After thinking a bit I decided to reimplement my DevEdit as clone of QTextEdit but without any HTML stuff making it slow and with a custom highlighting mechanism.

You'll have to wait more before the final version but if anyone is interested in the current one he can e-mail me to get it.

edit 2:
WTF !!! I looked into Qt's source and QTextedit would be quite hard to reimplement using inheritance... I'll try to craft a widget with a QAbstractScrollArea inside and custom paint, keypress, context menu (...)events.
I do not like the idea of starting from scratch but...

[elcuco]

Ok, nice. So it can be done...

I see you have exactly the same problem I have.
I am using a QTabWidget, I seem to have an orrible space on the right side, which means the right scrollbar is not on the "infinite-right". I have looked into Qt-Assistant code for some ideas about how they did it, and I "borrowed" that code, but still the internal editor is way from from the sides of the window.

Again, a few questions if you do not mind:
1) "display tab as X spaces", did you implement it? If so how? if not, how are you planning?
2) The syntax highlighter. It's based on the examples from the trolls? See notes bellow.
3) Current line and match brackets. Planned...? Implemented...?

I am toying with this issue myself, and I already implemented a hack of a system for displaying and loading SL. I am currently loading parts of GtkSourceView SH definitions, and I can display in a rather good quality C/C++/C# syntaxes. I will fix the implementation I have to display DIFF and other goodies (I am still messing the implementation...). I used as a base the SH example supplied by the trolls with some spin ups.

If found that using RegEx for for the painting is extreamly painfull, as in big files (~1000 lines) text will take about 5 seconds to load. I will try to see if the code for settign the QSyntaxHighliter can be put in a QTimer::singleShot() to make this call asynchroneous and improove usability, as hack for a good SH system.

Did you write the SH yourself (as the example on Qt4.0 showed), or are you deriving QSyntaxHihlighter. In any case, how is the drawing made? (hard coded contexts or something like Kate?)

[impeteperry]

hi,
I'm working on a C++ IDE with build-in support for Qt4.
Basic GUI is working but QTextEdit does not match my requirements:
I'm looking for an editor which would show lines number, allow search and replace and so on...
QScintilla may have be fine but it hasn't been ported to Qt4 yet.
QSA implements a similar text editor but I have troubles customizing it!!!
Any ideas???

I use "kwrite" or "kate"

[fullmetalcoder]

I use "kwrite" or "kate"

lol
You don't seem to pay attention to profile on the right of each post! I'm a Windows user, even if I would like to change there's no way, other users would'nt agree!

Again, a few questions if you do not mind:
1) "display tab as X spaces", did you implement it? If so how? if not, how are you planning?
2) The syntax highlighter. It's based on the examples from the trolls? See notes bellow.
3) Current line and match brackets. Planned...? Implemented...?

[...]

If found that using RegEx for for the painting is extreamly painfull, as in big files (~1000 lines) text will take about 5 seconds to load. I will try to see if the code for settign the QSyntaxHighliter can be put in a QTimer::singleShot() to make this call asynchroneous and improove usability, as hack for a good SH system.

Did you write the SH yourself (as the example on Qt4.0 showed), or are you deriving QSyntaxHihlighter. In any case, how is the drawing made? (hard coded contexts or something like Kate?)

I don' mind!

1) three ways:
- either reimplementing the whole paint event which may be very hard.
- either using each time font gets modified :

setTabStopWidth( x * QFontMetrics( font() ).width(' ') );

setTabStopWidth( x * QFontMetrics( font() ).width(' ') );

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- either hacking the keypress event so that any tab char is translated as x spaces [pretty uggly and stupid]

2)Sure it is! Actually I took the reimplementation from QSA and subclassed it as C++ syntax highlighter. Yes it's based on QRegExp which is an inherently slow method with large files but, well...

3)What do you call current line? Isn't that implemented in two ways?
What do you call match bracket? Indentation? Indentation is planned but not that easy!
There was a "parenthesis matcher" in QSA code but I didn't understand it's goal so I removed it!

[elcuco]

1) Please, don't reimplement the drawing engine. I am not a native english speaker. My native language is Spanish, but since I live in Israel, my real language is Hebrew - which as you may know already it's a complex script (google for RTL or BIDI).

If you reimplement the drawing code of the QTextEdit, you will loose any BiDI support in that widget. You will probably mess up Chinese, Hindic, and some other languages which Lars has worked so hard to get in perfect shape.

The setTabStopWidth() seems to beright way. As you will be able to convert the tab to "spaces" and back. This means you do not mess with the text the use loaded.

2) Reguarding the SH, I will see if there is a way to set it in a callback or something, otherwise th UI gets frezzed for several seconds when the initial painting is done. I also found no eay to rehighlight the code (what if the user wants to use another highlight...?)

3) current line = current pararaph in QTextDocument terminology. I want to draw the current line with a different background.

When the cursor is on "}", that char should be drawed with another background color, and the same for the first "{".

I assume you support only C/C++/H files right now...?

[fullmetalcoder]

3) current line = current pararaph in QTextDocument terminology. I want to draw the current line with a different background.

It's planned but not working right now.

When the cursor is on "}", that char should be drawed with another background color, and the same for the first "{".

Would be quite hard!!!

I assume you support only C/C++/H files right now...?

Entierely true.

Due to the limitations of my wrapper around QTextEdit I started porting QScintilla to Qt4.
Pretty long and hard as I never learned Qt3!

[rh]

Due to the limitations of my wrapper around QTextEdit I started porting QScintilla to Qt4.

Yea, i played with porting QScintilla to Qt4. Of course if qt3to4 did all the work, it would be too easy, but there is still tons of hand-massaging you have to do. Porting from scratch using Riverbank's code as a guideline might in the end be the best way to go.

[fullmetalcoder]

Yea, i played with porting QScintilla to Qt4. Of course if qt3to4 did all the work, it would be too easy, but there is still tons of hand-massaging you have to do. Porting from scratch using Riverbank's code as a guideline might in the end be the best way to go.

Where to find Riverbak's code? Would be happy to find an easy way!!!

[elcuco]

QScintilla does not support anything but Latin1 and thus it's unusable for me and many others.

[fullmetalcoder]

I ported QScintilla by hand from Qt3 to Qt4, it compiled without even one warning.
I then tried to use it in a very simple program and it linked with no problem, the window appeared...
but not the cursor
then tryed to copy from another editor... NO WAY!!! but the context menu displayed...
then tryed to typoe by hand a few words... NO WAY!!! What the fuck is that???
I spent 4hours porting something that doesn't work!!!

[elcuco]

I ported QScintilla by hand from Qt3 to Qt4, it compiled without even one warning.
I then tried to use it in a very simple program and it linked with no problem, the window appeared...
but not the cursor
then tryed to copy from another editor... NO WAY!!! but the context menu displayed...
then tryed to typoe by hand a few words... NO WAY!!! What the fuck is that???
I spent 4hours porting something that doesn't work!!!

release the code or shut up...

at last for the first editor!

[fullmetalcoder]

which code??? buggy QScintilla or working QTextEdit???

QTextEdit based now highlight current line in cyan but there's still a twist:
no simple way to make it highlight the whole line, as in Dev-C++ for example.
any ideas on how to do that?

cheers

[elcuco]

I would like to see a code based on QTextEdit, because of the reasons I explained before. But that's me

[fullmetalcoder]

I should be able to post it tomorrow.

No solutions comes to me about current line colouring but I implemented the basis of a breakpoint management system.

Seems to progress!!!

[rh]

If you want to see more information on scintilla implementations, you may want to check out:

http://www.codeproject.com

and search for "scintilla". Of course these will be implemented with MFC or in C#, but you might get some ideas.

P.S. CodeProject's search isn't very good; you'll get more hits googling the CodeProject site.