Newton_Editor/plugins/markdown_preview/plugin.py

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# Python imports
import os
# Lib imports
import gi
gi.require_version('Gtk', '3.0')
gi.require_version('Gdk', '3.0')
gi.require_version('WebKit2', '4.0')
from gi.repository import Gtk
from gi.repository import Gdk
from gi.repository import WebKit2
# Application imports
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from . import markdown
from .markdown_template_mixin import MarkdownTemplateMixin
from plugins.plugin_base import PluginBase
class Plugin(MarkdownTemplateMixin, PluginBase):
def __init__(self):
super().__init__()
self.name = "Markdown Preview" # NOTE: Need to remove after establishing private bidirectional 1-1 message bus
# where self.name should not be needed for message comms
self.path = os.path.dirname(os.path.realpath(__file__))
self._GLADE_FILE = f"{self.path}/markdown_preview.glade"
self.is_preview_paused = False
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self.is_md_file = False
def run(self):
WebKit2.WebView() # Need one initialized for webview to work from glade file
self._builder = Gtk.Builder()
self._builder.add_from_file(self._GLADE_FILE)
self._connect_builder_signals(self, self._builder)
separator_right = self._ui_objects[0]
self._markdown_dialog = self._builder.get_object("markdown_preview_dialog")
self._markdown_view = self._builder.get_object("markdown_view")
self._web_view_settings = self._builder.get_object("web_view_settings")
self._markdown_dialog.set_relative_to(separator_right)
self._markdown_view.set_settings(self._web_view_settings)
self._markdown_view.set_background_color(Gdk.RGBA(0, 0, 0, 0.0))
def generate_reference_ui_element(self):
...
def subscribe_to_events(self):
self._event_system.subscribe("tggle_markdown_preview", self._tggle_markdown_preview)
self._event_system.subscribe("set_active_src_view", self._set_active_src_view)
self._event_system.subscribe("buffer_changed", self._do_markdown_translate)
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def _buffer_changed_first_load(self, buffer):
self._buffer = buffer
self._do_markdown_translate(buffer)
def _set_active_src_view(self, source_view):
self._active_src_view = source_view
self._buffer = self._active_src_view.get_buffer()
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self._do_markdown_translate(self._buffer)
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def _handle_settings(self, widget = None, eve = None):
...
def _tggle_preview_updates(self, widget = None, eve = None):
self.is_preview_paused = not self.is_preview_paused
widget.set_active(self.is_preview_paused)
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if not self.is_preview_paused:
self._do_markdown_translate(self._buffer)
def _tggle_markdown_preview(self, widget = None, eve = None):
if not self._active_src_view: return
is_visible = self._markdown_dialog.is_visible()
buffer = self._active_src_view.get_buffer()
data = None
if not is_visible:
self._markdown_dialog.popup();
self._do_markdown_translate(buffer)
elif not data and is_visible:
self._markdown_dialog.popdown()
def _do_markdown_translate(self, buffer):
if self.is_preview_paused: return
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self.is_markdown_check()
is_visible = self._markdown_dialog.is_visible()
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if not is_visible or not self.is_md_file: return
self.render_markdown(buffer)
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def render_markdown(self, buffer):
start_iter = buffer.get_start_iter()
end_iter = buffer.get_end_iter()
text = buffer.get_text(start_iter, end_iter, include_hidden_chars = False)
html = markdown.markdown(text)
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path = self._active_src_view.get_current_file().get_parent().get_path()
data = self.wrap_html_to_body(html)
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self._markdown_view.load_html(content = data, base_uri = f"file://{path}/")
def is_markdown_check(self):
self.is_md_file = self._active_src_view.get_filetype() == "markdown"
if not self.is_md_file:
data = self.wrap_html_to_body("<h1>Not a Markdown file...</h1>")
self._markdown_view.load_html(content = data, base_uri = None)