On Tuesday 14 September 2010, 17:51:28 Steve Borho wrote: > On Tue, Sep 14, 2010 at 4:08 AM, Hans-Peter Jansen <h...@urpla.net> wrote: > > On Tuesday 14 September 2010, 09:48:47 Algis Kabaila wrote: > >> > On Tuesday 14 September 2010, 01:54:01 Algis Kabaila wrote: > >> > > Is it possible to access lines of text in a textEdit? If so how > >> > > can I find information about it? > >> > >> On Tuesday 14 September 2010 10:09:10 Hans-Peter Jansen wrote: > >> > Depending on document type, try this: > >> > > >> > document().findBlockByLineNumber(lineNumber).text() > >> > > >> > Pete > >> > >> On Tuesday 14 September 2010 12:24:52 Henning Schröder wrote: > >> > If you enter findBlockByLineNumber in Qt Assistant you will see that > >> > this method belongs to a QTextDocument object and returns a > >> > QTextBlock object QTextEdit has a method called "document()" which > >> > returns a QTextDocument. > >> > > >> > Henning > >> > >> In summary, the i-th line is returned by the following > >> > >> line = self.textEdit.document().findBlockByLineNumber(i).text(), > >> > >> which at least in part is identical to what Hans-Peter told me to do. > >> Hennings advice to look up Qt Assistant was an invaluable help. Thank > >> you both. > > > > Al, I cannot imagine how to work with PyQt successfully _without_ using > > assistant. Of course, Qt's class hierarchy is quite senseful most of > > the time in the first place, but due to the sheer volume of it, nobody > > is able to memorize this all. > > > > Just a few words on methology: > > > > Searching for some functionality of QTextEdit, e.g. how to get at a > > specific line via line number: > > * Look up QTextEdit in assistant > > We read: The QTextEdit class provides a widget that is used to edit > > and display both plain and rich text. > > * Click on more... > > We read: QTextEdit works on paragraphs and characters. A paragraph is > > a formatted string which is word-wrapped to fit into the width of the > > widget. By default when reading plain text, one newline signifies a > > paragraph. > > Sounds like we're looking for paragraphs in plain text mode > > * Check class methods, that do what we want: > > Nothing obvious stands out > > * Check base classes: > > QTextEdit inherits from QAbstractScrollArea only, that won't help us > > much here > > * Check methods again: > > Nothing obvious with paragraphs, but QTextDocument * document() might > > be interesting > > * Click on document() method: > > We read: Returns a pointer to the underlying document. > > * Check it out: click on QTextDocument > > We read: The QTextDocument class holds formatted text that can be > > viewed and edited using a QTextEdit > > We're getting nearer, but still no ball: check out class methods > > * It has a method: QTextBlock findBlockByLineNumber ( int lineNumber ) > > Sounds like the best fit: click on method > > * We read: Returns the text block that contains the specified > > lineNumber. What the hell is a QTextBlock? Click: > > It encapsulates text fragments, and provides access to them > > * Check methods: QString text() sounds, like what we are looking for > > We read: Returns the block's contents as plain text. > > > > Target reached. > > > > Note, how this transforms to a single line of code. Isn't it > > impressive, how much power is at our finger tips and how much joy it > > can be to ignore all this superfluous C++ decoration, that would > > involve much more work to get right ;-) > > How does one get the documentation files to make assistant useful on > Windows?
Download a matching zip archive, e.g.: ftp://ftp.qt.nokia.com/qt/source/qt-everywhere-opensource-src-4.6.3.zip, extract the doc/qch/*.qch files and register them within assistant. Pete _______________________________________________ PyQt mailing list PyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
