my LineSpacing plugin for Gedit 3

NOTICE : This article is out of date.
see update : my LineSpacing plugin for Gedit 3.12 and upper

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I made tiny plugin script for Gedit 3. This plugin let line-spacing in gedit text pane.

File : linespacing.plugin

[Plugin]
Loader=python
Module=linespacing
IAge=3
Name=Line-spacing
Description=Increase or decrease space between lines
Authors=
Copyright=
Website=

File : linespacing.py

from gi.repository import GObject, Gtk, Gedit

UI_XML = """<ui>
<menubar name="MenuBar">
    <menu name="ToolsMenu" action="Tools">
      <placeholder name="ToolsOps_3">
        <menuitem name="LineSpacingAction0" action="LineSpacingAction0"/>
        <menuitem name="LineSpacingAction1" action="LineSpacingAction1"/>
        <menuitem name="LineSpacingAction2" action="LineSpacingAction2"/>
      </placeholder>
    </menu>
</menubar>
</ui>"""

class LineSpacing(GObject.Object, Gedit.WindowActivatable):
    __gtype_name__ = "LineSpacing"
    window = GObject.property(type=Gedit.Window)

    def __init__(self):
        GObject.Object.__init__(self)

    def _add_ui(self):
        manager = self.window.get_ui_manager()
        self._actions = Gtk.ActionGroup("LineSpacingActions")
        self._actions.add_actions([
            ('LineSpacingAction0', Gtk.STOCK_INFO, "Reset Line spacing", 
                "<Control><Alt>0", "Reset Line spacing", 
                self.on_linespacing_action_activate0),
            ('LineSpacingAction1', Gtk.STOCK_INFO, "Decrease Line spacing", 
                "<Control><Alt>8", "Decrease Line spacing", 
                self.on_linespacing_action_activate1),
            ('LineSpacingAction2', Gtk.STOCK_INFO, "Increase Line spacing", 
                "<Control><Alt>9", "Increase Line spacing", 
                self.on_linespacing_action_activate2),
        ])
        manager.insert_action_group(self._actions)
        self._ui_merge_id = manager.add_ui_from_string(UI_XML)
        manager.ensure_update()

    def do_activate(self):
        self._add_ui()

    def do_deactivate(self):
        self._remove_ui()

    def do_update_state(self):
        pass

    def on_linespacing_action_activate0(self, action, data=None):
        view = self.window.get_active_view()
        if view:
            view.set_pixels_below_lines(0)
            view.set_pixels_inside_wrap(0)

    def on_linespacing_action_activate1(self, action, data=None):
        view = self.window.get_active_view()
        if view:
            if view.get_pixels_below_lines() >= 0:
                view.set_pixels_below_lines(view.get_pixels_below_lines() - 1)
            if view.get_pixels_inside_wrap() >= 0:
                view.set_pixels_inside_wrap(view.get_pixels_inside_wrap() - 1)

    def on_linespacing_action_activate2(self, action, data=None):
        view = self.window.get_active_view()
        if view:
            view.set_pixels_below_lines(view.get_pixels_below_lines() + 1)
            view.set_pixels_inside_wrap(view.get_pixels_inside_wrap() + 1)

    def _remove_ui(self):
        manager = self.window.get_ui_manager()
        manager.remove_ui(self._ui_merge_id)
        manager.remove_action_group(self._actions)
        manager.ensure_update()

To install, place these two files into $home/.local/share/gedit/plugins/ folder. (If these folder is not found, made it by hand)

And restart Gedit, pull down “Edit” -> “Settings”, “Plugin” tab. You’ll find “Line-Spacing” plugin, check it to enable.
After plugin enable, see Pull down “Tool” menu. You will see these three items.

1) Reset Line spacing       Ctrl+Alt+0
2) Decrease Line spacing    Ctrl+Alt+8
3) Increase Line spacing    Ctrl+Alt+9

use pull down menu, or key combinations.

Notice :
at default, line spacing works for ‘Phisical line’, not ‘Logical line’. to let working for logical line, remark the line which contains ‘pixels_inside_wrap’.

$ mv linespacing.py linespacing.bak
$ awk '{ if ($0 ~ "pixels_inside_wrap") { print "#" $0 } else print }' linespacing.bak > linespacing.py

I refered gedit3 plugin tutorial to write this plugin. Thanks !

Writing Plugins for gedit 3 with Python  –  micah carrick
http://www.micahcarrick.com/writing-plugins-for-gedit-3-in-python.html

I am sorry of my poor english and … enjoy !

log:fixed indentation on 2013/05/15