[PyQt] Setting font for QScintilla

[projetmbc]

Thanks to Baz WALTER, I've finally done a very simple example of folding 
with QScintilla.

I still have a little problem because I only want to have the comments 
in bold font in my example. Indeed all is in bold font. I don't 
understand why.

Every kinf of help will be appreciated.
Christophe
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import sys
from PyQt4.QtCore import SIGNAL, SLOT, QString
from PyQt4.QtGui import QApplication, QMainWindow, QColor, QFont
from PyQt4.Qsci import QsciScintilla, QsciLexerCustom

# Code given by Baz WALTER on the PyQt list

if sys.hexversion < 0x020600F0:
    print('python 2.6 or greater is required by this program')
    sys.exit(1)

_sample = """
/* This example uses
this multi-line coment
which can be extanded or retracted.

The end must be the following line.
*/

A text outside a comment
is not retactable.


/* Another

test.
*/
"""


class MainWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.setWindowTitle('Custom Lexer For Config Files')
        self.setGeometry(50, 200, 400, 400)
        self.editor = QsciScintilla(self)
        self.editor.setUtf8(True)
        self.editor.setFolding(QsciScintilla.BoxedTreeFoldStyle)
        self.setCentralWidget(self.editor)
        self.lexer = ConfigLexer(self.editor)
        self.editor.setLexer(self.lexer)
        self.editor.setText(_sample)


class ConfigLexer(QsciLexerCustom):
    def __init__(self, parent):
        QsciLexerCustom.__init__(self, parent)
        self._styles = {
            0: 'Default',
            1: 'Comment_Start',
            2: 'Comment',
            3: 'Comment_End'
            }
        for key,value in self._styles.iteritems():
            setattr(self, value, key)
        self._foldcompact = True

    def foldCompact(self):
        return self._foldcompact

    def setFoldCompact(self, enable):
        self._foldcompact = bool(enable)

    def language(self):
        return 'Config Files'

    def description(self, style):
        return self._styles.get(style, '')

    def defaultColor(self, style):
        if style == self.Default:
            return QColor('#000000')
        elif style == self.Comment or style == self.Comment_End or style == self.Comment_Start:
            return QColor('#A0A0A0')
        return QsciLexerCustom.defaultColor(self, style)

    def defaultFont(self, style):
        if style == self.Comment or self.Comment_End:
            if sys.platform in ('win32', 'cygwin'):
                return QFont('Comic Sans MS', 9, QFont.Bold)
            return QFont('Bitstream Vera Serif', 9, QFont.Bold)
        return QsciLexerCustom.defaultFont(self, style)

    def defaultPaper(self, style):
# Here we change the color of the background.
# We want that colorize all the background of the line.
# This is done by using the following method defaultEolFill() .
        if style == self.Comment or style == self.Comment_End or style == self.Comment_Start:
            return QColor('#FFEECC')
        return QsciLexerCustom.defaultPaper(self, style)

    def defaultEolFill(self, style):
# This allowed to colorize all the background of a line.
        if style == self.Comment or style == self.Comment_End or style == self.Comment_Start:
            return True
        return QsciLexerCustom.defaultEolFill(self, style)

    def styleText(self, start, end):
        editor = self.editor()
        if editor is None:
            return

        SCI = editor.SendScintilla
        GETFOLDLEVEL = QsciScintilla.SCI_GETFOLDLEVEL
        SETFOLDLEVEL = QsciScintilla.SCI_SETFOLDLEVEL
        HEADERFLAG = QsciScintilla.SC_FOLDLEVELHEADERFLAG
        LEVELBASE = QsciScintilla.SC_FOLDLEVELBASE
        NUMBERMASK = QsciScintilla.SC_FOLDLEVELNUMBERMASK
        WHITEFLAG = QsciScintilla.SC_FOLDLEVELWHITEFLAG
        set_style = self.setStyling

        source = ''
        if end > editor.length():
            end = editor.length()
        if end > start:
            source = bytearray(end - start)
            SCI(QsciScintilla.SCI_GETTEXTRANGE, start, end, source)
        if not source:
            return

        compact = self.foldCompact()

        index = SCI(QsciScintilla.SCI_LINEFROMPOSITION, start)
        if index > 0:
            pos = SCI(QsciScintilla.SCI_GETLINEENDPOSITION, index - 1)
            state = SCI(QsciScintilla.SCI_GETSTYLEAT, pos)
        else:
            state = self.Default

        self.startStyling(start, 0x1f)

        for line in source.splitlines(True):
# Try to uncomment the following line to see in the console
# how Scintiallla works. You have to think in terms of isolated
# lines rather than globally on the whole text.
#            print line

            length = len(line)
# We must take care of empty lines.
# This is done here.
            if length == 1:
                if state == self.Comment_End :
                    state = self.Default
                elif state == self.Comment_Start:
                    state = self.Comment
            else:
                if line.startswith('/*'):
                    state = self.Comment_Start
                elif line.startswith('*/'):
                    if state == self.Comment or state == self.Comment_Start:
                        state = self.Comment_End
                    else:
                        state = self.Default
                elif state == self.Comment or state == self.Comment_Start:
                    state = self.Comment
                else:              
                    state = self.Default

            set_style(length, state)

# Definition of the folding.
            if state == self.Comment_Start:
                print '-'*30
                print line
                level = LEVELBASE | HEADERFLAG
            elif state == self.Comment or state == self.Comment_End:
                level = LEVELBASE + 1
            elif state == self.Default:
                level = LEVELBASE

            SCI(SETFOLDLEVEL, index, level)

            index += 1


if __name__ == "__main__":
    app = QApplication(sys.argv)
    app.connect(app, SIGNAL('lastWindowClosed()'), app, SLOT('quit()'))
    win = MainWindow()
    win.show()
    sys.exit(app.exec_())