gaupol/util.py¶
Source code for module gaupol.util from file gaupol/util.py.
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# Copyright (C) 2005 Osmo Salomaa
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""Miscellaneous functions and decorators."""
import aeidon
import gaupol
import inspect
import sys
import traceback
import webbrowser
from gi.repository import Gdk
from gi.repository import GLib
from gi.repository import Gtk
from gi.repository import Pango
def char_to_px(nchar, font=None):
"""Convert characters to pixels."""
if nchar < 0: return nchar
label = Gtk.Label(label="etaoin shrdlu")
if font is not None:
set_widget_font(label, font)
width = label.get_layout().get_pixel_size()[0]
return int(round(nchar * width/13))
def delay_add(delay, function, *args, **kwargs):
"""
Call `function` with `args` and `kwargs` once after `delay` (ms).
Return integer ID of the event source from :func:`GLib.timeout_add`.
"""
def call_function(*args, **kwargs):
function(*args, **kwargs)
return False # to not be called again.
return GLib.timeout_add(delay, call_function, *args, **kwargs)
def document_to_text_field(doc):
"""Return :attr:`gaupol.fields` item corresponding to `doc`."""
if doc == aeidon.documents.MAIN:
return gaupol.fields.MAIN_TEXT
if doc == aeidon.documents.TRAN:
return gaupol.fields.TRAN_TEXT
raise ValueError("Invalid document: {}"
.format(repr(doc)))
def flash_dialog(dialog):
"""
Run `dialog`, destroy it and return response.
:func:`flash_dialog` or :func:`run_dialog` should be used always when
a :class:`Gtk.Dialog` is run so that unit tests can monkey patch this
function with one that returns a specified response without waiting
for user input.
"""
response = dialog.run()
dialog.destroy()
return response
def get_content_size(widget):
"""Return the width and height desired by `widget`."""
if isinstance(widget, Gtk.TextView):
return get_text_view_size(widget)
if isinstance(widget, Gtk.TreeView):
return get_tree_view_size(widget)
raise ValueError("Unsupported container type: {}"
.format(repr(type(widget))))
def get_font():
"""Return custom font or blank string."""
return (gaupol.conf.editor.custom_font if
gaupol.conf.editor.use_custom_font and
gaupol.conf.editor.custom_font else "")
def get_gst_version():
"""Return :mod:`Gst` version number as string or ``None``."""
try:
from gi.repository import Gst
return ".".join(map(str, Gst.version()))
except Exception:
return None
def get_icon_image(name, fallback, size):
"""Return icon image from `name` or `fallback` in theme."""
theme = Gtk.IconTheme.get_default()
if theme.has_icon(name):
return Gtk.Image(icon_name=name, icon_size=size)
return Gtk.Image(icon_name=name, icon_size=size)
def get_preview_command():
"""Return command to use for lauching video player."""
if gaupol.conf.preview.use_custom_command:
return gaupol.conf.preview.custom_command
if gaupol.conf.preview.force_utf_8:
return gaupol.conf.preview.player.command_utf_8
return gaupol.conf.preview.player.command
def get_text_view_size(text_view, font=None):
"""Return the width and height desired by `text_view`."""
text_buffer = text_view.get_buffer()
start, end = text_buffer.get_bounds()
text = text_buffer.get_text(start, end, False)
label = Gtk.Label(label=text)
if font is not None:
set_widget_font(label, font)
label.show()
return (label.get_preferred_width()[1]
+ text_view.get_left_margin()
+ text_view.get_right_margin(),
label.get_preferred_height()[1])
def get_tree_view_size(tree_view):
"""Return the width and height desired by `tree_view`."""
scroller = tree_view.get_parent()
policy = scroller.get_policy()
scroller.set_policy(Gtk.PolicyType.NEVER, Gtk.PolicyType.NEVER)
width = scroller.get_preferred_width()[1]
height = scroller.get_preferred_height()[1]
scroller.set_policy(*policy)
return width, height
@aeidon.deco.once
def get_zebra_color(tree_view):
"""Return background color to use for tree view zebra-stripes."""
style = tree_view.get_style_context()
fg = style.get_color(Gtk.StateFlags.NORMAL)
bg = style.get_background_color(Gtk.StateFlags.NORMAL)
color = Gdk.RGBA()
color.red = 0.9 * bg.red + 0.1 * fg.red
color.green = 0.9 * bg.green + 0.1 * fg.green
color.blue = 0.9 * bg.blue + 0.1 * fg.blue
return(color)
@aeidon.deco.once
def gst_available():
"""
Return ``True`` if :mod:`Gst` module is available.
Also check that required elements from gst-plugins-base and
gst-plugins-good are available.
"""
try:
from gi.repository import Gst
except Exception:
return False
if not Gst.ElementFactory.find("playbin"):
print("GStreamer found, but playbin missing.",
"Try installing gst-plugins-base.",
file=sys.stderr)
return False
if not Gst.ElementFactory.find("textoverlay"):
print("GStreamer found, but textoverlay missing.",
"Try installing gst-plugins-base.",
file=sys.stderr)
return False
if not Gst.ElementFactory.find("timeoverlay"):
print("GStreamer found, but timeoverlay missing.",
"Try installing gst-plugins-base.",
file=sys.stderr)
return False
if not Gst.ElementFactory.find("autovideosink"):
print("GStreamer found, but autovideosink missing.",
"Try installing gst-plugins-good.",
file=sys.stderr)
return False
return True
@aeidon.deco.once
def gtkspell_available():
"""Return ``True`` if :mod:`GtkSpell` module is available."""
try:
from gi.repository import GtkSpell
return True
except Exception:
return False
def hex_to_rgba(string):
"""
Return a :class:`Gdk.RGBA` for hexadecimal `string`.
Raise :exc:`ValueError` if parsing `string` fails.
"""
rgba = Gdk.RGBA()
success = rgba.parse(string)
if not success:
raise ValueError("Parsing string {} failed".format(repr(string)))
return rgba
def idle_add(function, *args, **kwargs):
"""
Call `function` with `args` and `kwargs` when idle.
Return integer ID of the event source from :func:`GLib.idle_add`.
"""
def call_function(*args, **kwargs):
function(*args, **kwargs)
return False # to not be called again.
return GLib.idle_add(call_function, *args, **kwargs)
def install_module(name, obj):
"""
Install `obj`'s module into the :mod:`gaupol` namespace.
Typical call is of form::
gaupol.util.install_module("foo", lambda: None)
"""
gaupol.__dict__[name] = inspect.getmodule(obj)
def iterate_main():
"""Iterate the GTK+ main loop while events are pending."""
while Gtk.events_pending():
Gtk.main_iteration()
def lines_to_px(nlines, font=None):
"""Convert lines to pixels."""
if nlines < 0: return nlines
text = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
label = Gtk.Label(label=text)
if font is not None:
set_widget_font(label, font)
height = label.get_layout().get_pixel_size()[1]
return int(round(nlines * height))
def new_hbox(spacing):
"""Return a new horizontal :class:`Gtk.Box`."""
return Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL,
spacing=spacing)
def new_vbox(spacing):
"""Return a new vertical :class:`Gtk.Box`."""
return Gtk.Box(orientation=Gtk.Orientation.VERTICAL,
spacing=spacing)
def pack_start(box, widget, padding=0):
"""Pack widget to box without fill or expand."""
box.pack_start(widget,
expand=False,
fill=False,
padding=padding)
def pack_start_expand(box, widget, padding=0):
"""Pack widget to box with fill and expand."""
box.pack_start(widget,
expand=True,
fill=True,
padding=padding)
def pack_start_fill(box, widget, padding=0):
"""Pack widget to box with fill, but no expand."""
box.pack_start(widget,
expand=False,
fill=True,
padding=padding)
def prepare_text_view(text_view):
"""Set spell-check, line-length margin and font properties."""
if (gaupol.util.gtkspell_available() and
gaupol.conf.spell_check.inline):
from gi.repository import GtkSpell
language = gaupol.conf.spell_check.language
with aeidon.util.silent(Exception):
checker = GtkSpell.Checker()
checker.set_language(language)
checker.attach(text_view)
connect = gaupol.conf.editor.connect
def update_margin(section, value, text_view):
if gaupol.conf.editor.show_lengths_edit:
return gaupol.ruler.connect_text_view(text_view)
return gaupol.ruler.disconnect_text_view(text_view)
connect("notify::show_lengths_edit", update_margin, text_view)
update_margin(None, None, text_view)
def update_font(section, value, text_view):
set_widget_font(text_view, get_font())
connect("notify::use_custom_font", update_font, text_view)
connect("notify::custom_font", update_font, text_view)
update_font(None, None, text_view)
def update_spacing(section, value, text_view):
if gaupol.conf.editor.show_lengths_cell:
return text_view.set_pixels_above_lines(2)
return text_view.set_pixels_above_lines(0)
connect("notify::show_lengths_cell", update_spacing, text_view)
update_spacing(None, None, text_view)
def raise_default(expression):
"""Raise :exc:`gaupol.Default` if `expression` evaluates to ``True``."""
if expression:
raise gaupol.Default
def rgba_to_hex(color):
"""Return hexadecimal string for :class:`Gdk.RGBA` `color`."""
return "#{:02x}{:02x}{:02x}".format(int(color.red * 255),
int(color.green * 255),
int(color.blue * 255))
def run_dialog(dialog):
"""
Run `dialog` and return response.
:func:`run_dialog` or :func:`flash_dialog` should be used always when
a :class:`Gtk.Dialog` is run so that unit tests can monkey patch this
function with one that returns a specified response without waiting
for user input.
"""
return dialog.run()
def scale_to_content(widget, min_nchar=0, max_nchar=32768,
min_nlines=0, max_nlines=32768, font=None):
"""Set `widget's` size by content, but limited by `min` and `max`."""
width, height = get_content_size(widget)
width = max(width, char_to_px(min_nchar, font))
width = min(width, char_to_px(max_nchar, font))
height = max(height, lines_to_px(min_nlines, font))
height = min(height, lines_to_px(max_nlines, font))
if isinstance(widget.get_parent(), Gtk.ScrolledWindow):
# It seems that for tree views and text views
# we need to set the size request of the scrolled window.
# Vaguely account for possible scrollbars.
widget = widget.get_parent()
width, height = width + 24, height + 24
widget.set_size_request(width, height)
def scale_to_size(widget, nchar, nlines, font=None):
"""Set `widget`'s size to `nchar` and `nlines`."""
width = char_to_px(nchar, font)
height = lines_to_px(nlines, font)
if isinstance(widget.get_parent(), Gtk.ScrolledWindow):
# It seems that for tree views and text views
# we need to set the size request of the scrolled window.
# Vaguely account for possible scrollbars.
widget = widget.get_parent()
width, height = width + 24, height + 24
widget.set_size_request(width, height)
def separate_combo(store, itr, data=None):
"""Separator function for combo box models."""
return store.get_value(itr, 0) == gaupol.COMBO_SEPARATOR
def set_cursor_busy(window):
"""Set mouse pointer busy when above window."""
cursor = window.get_window().get_cursor()
if (cursor is not None and cursor.get_cursor_type() ==
Gdk.CursorType.WATCH): return
cursor = Gdk.Cursor(cursor_type=Gdk.CursorType.WATCH)
window.get_window().set_cursor(cursor)
iterate_main()
def set_cursor_normal(window):
"""Set mouse pointer normal when above window."""
cursor = window.get_window().get_cursor()
if (cursor is not None and cursor.get_cursor_type() ==
Gdk.CursorType.LEFT_PTR): return
cursor = Gdk.Cursor(cursor_type=Gdk.CursorType.LEFT_PTR)
window.get_window().set_cursor(cursor)
def set_widget_font(widget, font):
"""Use `font` for `widget`."""
context = widget.get_pango_context()
font_desc = context.get_font_description()
custom_font_desc = Pango.FontDescription(font)
font_desc.merge(custom_font_desc, True)
widget.override_font(font_desc)
def show_exception(exctype, value, tb):
"""
Show exception traceback in :class:`gaupol.DebugDialog`.
This function can be set as a :func:`sys.excepthook`.
"""
traceback.print_exception(exctype, value, tb)
if not isinstance(value, Exception): return
try: # to avoid recursion.
dialog = gaupol.DebugDialog()
dialog.set_text(exctype, value, tb)
response = dialog.run()
dialog.destroy()
if response == Gtk.ResponseType.NO:
raise SystemExit(1)
except Exception:
traceback.print_exc()
def show_uri(uri):
"""Open `uri` in default application."""
try:
return Gtk.show_uri(None, uri, Gdk.CURRENT_TIME)
except Exception:
# Gtk.show_uri fails on Windows and some misconfigured installations.
# GError: No application is registered as handling this file
# Gtk.show_uri: Operation not supported
if uri.startswith(("http://", "https://")):
return webbrowser.open(uri)
raise # whatever error encountered.
def text_field_to_document(field):
"""Return :attr:`aeidon.documents` item corresponding to `field`."""
if field == gaupol.fields.MAIN_TEXT:
return aeidon.documents.MAIN
if field == gaupol.fields.TRAN_TEXT:
return aeidon.documents.TRAN
raise ValueError("Invalid field: {}"
.format(repr(field)))
def tree_path_to_row(path):
"""
Convert `path` to a list row integer.
`path` can be either a :class:`Gtk.Treepath` instance or a string
representation of it (as commonly used by various callbacks).
"""
if path is None: return None
if isinstance(path, Gtk.TreePath):
return(path.get_indices()[0])
if isinstance(path, str):
return(int(path))
raise TypeError("Bad type {} for path {}"
.format(repr(type(path)), repr(path)))
def tree_row_to_path(row):
"""Convert list row integer to a :class:`Gtk.TreePath`."""
if row is None: return None
return Gtk.TreePath.new_from_string(str(row))
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