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? -- Steve Borho _______________________________________________ PyQt mailing list PyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
