The attached Leo outline contains a script to highlight the line in the body that has the cursor. You can activate it by selecting the top-most node, then pressing CTRL-b. After this, the cursor line should become highlighted anywhere in the outline. Other outlines will not be affected.
If you want to try it out in another outline, copy the script, paste it into the other outline, and run it with CTRL-b. Activating the highlighting this way is a bit strange, but lets you try it out without needing to modify Leo itself or install a different version. Eventually, the code would be included and activated when the body pane is constructed. I'd like to know how you like the effect, and whether you think the highlight color works well enough. Note that the highlight color will be different for different Leo themes (and no-theme color schemes). The script tries to calculate reasonable colors. If the background is light, the highlight will be the same hue but darker. If the background is dark, the highlight will be the same hue but lighter. If the background is very light or very dark, different rules may be applied. I have tried this out on every theme in Leo's theme directory. The colors seem to work acceptably to me. If you have your own theme that isn't one of the standard ones, I'm especially interested in how that works out. And, of course, post here if you notice any bugs or anomalies. -- You received this message because you are subscribed to the Google Groups "leo-editor" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/leo-editor/67e19356-791c-4b93-80d9-8d95f9f9c394n%40googlegroups.com.
<?xml version="1.0" encoding="utf-8"?> <!-- Created by Leo: http://leoeditor.com/leo_toc.html --> <leo_file xmlns:leo="http://leoeditor.com/namespaces/leo-python-editor/1.1"; > <leo_header file_format="2"/> <vnodes> <v t="tom.20210827170535.1"><vh>Highlight Current Line</vh> <v t="tom.20210827170535.2"><vh>highlightCurrentLine</vh> <v t="tom.20210827170535.3"><vh>parse_css</vh></v> <v t="tom.20210827170535.4"><vh>assign_bg</vh></v> <v t="tom.20210827170535.5"><vh>calc_hl</vh></v> </v> </v> </vnodes> <tnodes> <t tx="tom.20210827170535.1">@language python from leo.core.leoQt import QtGui QColor = QtGui.QColor FullWidthSelection = 0x06000 # works for both Qt5 and Qt6 w = c.frame.body.wrapper editor = w.widget @others editor.cursorPositionChanged.connect(highlightCurrentLine)</t> <t tx="tom.20210827170535.2">@language python def highlightCurrentLine(): """Highlight cursor line. Based in part on code from https://doc.qt.io/qt-5/qtwidgets-widgets-codeeditor-example.html """ ssm = c.styleSheetManager sheet = ssm.expand_css_constants(c.active_stylesheet) fg, bg = parse_css(sheet, 'QTextEdit') bg_color = QColor(bg) if bg else assign_bg(fg) hl_color = calc_hl(bg_color) selection = editor.ExtraSelection() selection.format.setBackground(hl_color) selection.format.setProperty(FullWidthSelection, True) selection.cursor = editor.textCursor() selection.cursor.clearSelection() editor.setExtraSelections([selection]) </t> <t tx="tom.20210827170535.3">@language python def parse_css(css_string, clas=''): """Extract colors from a css stylesheet string. This is an extremely simple-minded function. It assumes that no quotation marks are being used, and that the first block in braces with the name clas is the controlling css for our widget. Returns a tuple of strings (foregound, background). """ # Get first block with name matching "clas' block = css_string.split(clas, 1) block = block[1].split('{', 1) block = block[1].split('}', 1) # Split into styles separated by ";" styles = block[0].split(';') # Split into fields separated by ":" fields = [style.split(':') for style in styles if style.strip()] # Only get fields whose names are "color" and "background" color = bg = '' for style, val in fields: style = style.strip() if style == 'color': color = val.strip() elif style == 'background': bg = val.strip() return color, bg </t> <t tx="tom.20210827170535.4">@language python def assign_bg(fg): """If fg or bg colors are missing, assign reasonable values. Can happen with incorrectly constructed themes, or no-theme color schemes. RETURNS a QColor object for the background color """ if not fg: fg = 'black' # QTextEdit default bg = 'white' # QTextEdit default if fg == 'black': bg = 'white' # QTextEdit default else: fg_color = QColor(fg) h, s, v, a = fg_color.getHsv() if v < 128: # dark foreground bg = 'white' else: bg = 'black' return QColor(bg) </t> <t tx="tom.20210827170535.5">@language python def calc_hl(bg_color): """Return the line highlight color. ARGUMENT bg_color -- a QColor object for the background color RETURNS a QColor object for the highlight color """ h, s, v, a = bg_color.getHsv() if v < 24: v = 50 bg_color.setHsv(h, s, v, a) elif v > 240: v = 220 bg_color.setHsv(h, s, v, a) elif v < 128: bg_color = bg_color.lighter(130) else: bg_color = bg_color.darker(130) return bg_color </t> </tnodes> </leo_file>
