Here is a version that will highlight the current line for all outlines that are open at the time you run the script. Open the outline, select the top-level node, and press <CTRL-b>. If you open any other outlines after this, you will need to run it again.
As a reminder, you can override the highlight color with a CSS color value of your choice by using the *@string line-highlight-color *setting. Standard colors like *blue* are understood, and also numerical values like *#234567*. Other color expressions are not understood. I expect line highlighting to get into Leo right after 6.4 is released - no more need to run a batch file. It's working well on my system. On Friday, August 27, 2021 at 9:45:12 AM UTC-4 [email protected] wrote: > Here is the current version of the script, after some cleanup and > reorganization, and one change to get it to work under PyQt6.11 as well as > PyQt5. > > On Thursday, August 26, 2021 at 6:49:14 PM UTC-4 [email protected] wrote: > >> I now have reasonable colors for highlighting of very dark and very light >> themes, as well as for no-theme color schemes that forgot to set the >> background color. >> >> On Thursday, August 26, 2021 at 5:25:26 PM UTC-4 [email protected] wrote: >> >>> @ekr asked me to see about getting Leo's body editor to highlight the >>> current line. This was in response to a request in Issue 2150 >>> <https://github.com/leo-editor/leo-editor/issues/2150>. I've made some >>> progress, which I report here. I'd say it's about 3/4 of the way there. >>> >>> I have a working script that, when run, highlights the cursor line in >>> the visible node's body. Here's what is left to do: >>> >>> 1. The highlight color isn't visible for very dark or very light >>> background colors. Currently the highlight color is a modification of the >>> text background color as specified in the theme's stylesheet. The way this >>> color is arrived at needs to be improved . And I'm not yet sure how to >>> handle the case where no theme at all is in use (some people have tweaked >>> Leo's colors without using a theme). >>> >>> The highlight color scheme works well with the three >>> tbp_xxx_solarized.leo themes. >>> >>> 2. The code needs to have a proper home. Presumably this will be in the >>> qt_text.py plugin. >>> >>> 3. The code needs to be hooked up to the body's cursor events so that >>> the highlight code knows that it has to change lines. >>> >>> Also, as a longer term matter, the code does not use any wrappers or >>> abstractions, so it will only work for Qt-based Guis. This can be >>> addressed later, if it appears that there might be a viable non-Qt Gui >>> version of Leo. >>> >>> I've attached the current version of the code. Open it in Leo. Select >>> a line in the top node. Run the script by pressing CTRL-b. The current >>> line should highlight, although you may not be able to see it if you are >>> using a very dark or light theme, including Leo's default theme. Put the >>> cursor on a different line in the same body. Press CTRL-b again. The >>> highlight should shift to the new cursor line. >>> >>> Please let me know if you find any problems (apart from the actual >>> highlight color). >>> >> -- 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/bd946f07-0539-43b4-8300-ade6f8f54b92n%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 @others for cc in g.app.commanders(): w = cc.frame.body.wrapper editor = w.widget 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) bg = c.config.getString('line-highlight-color') or '' hl_color = QColor(bg) if hl_color.getHsv() == (0, 0, 0, 255) and bg != 'black': # Always returns black for an invalid color # So compute the color instead 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() if color and bg: break 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 < 40: v = 60 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>
