Coverage for qutebrowser/mainwindow/statusbar/backforward.py : 100%

# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et: 

# Copyright 2017-2018 Florian Bruhin (The Compiler) <mail@qutebrowser.org> 

# 

# This file is part of qutebrowser. 

# 

# qutebrowser 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. 

# 

# qutebrowser 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 qutebrowser. If not, see <http://www.gnu.org/licenses/>. 

"""Navigation (back/forward) indicator displayed in the statusbar.""" 

from qutebrowser.mainwindow.statusbar import textbase 

class Backforward(textbase.TextBase): 

"""Shows navigation indicator (if you can go backward and/or forward).""" 

def __init__(self, parent=None): 

super().__init__(parent) 

self.enabled = False 

def on_tab_cur_url_changed(self, tabs): 

"""Called on URL changes.""" 

tab = tabs.currentWidget() 

if tab is None: # pragma: no cover 

self.setText('') 

self.hide() 

return 

self.on_tab_changed(tab) 

def on_tab_changed(self, tab): 

"""Update the text based on the given tab.""" 

text = '' 

if tab.history.can_go_back(): 

text += '<' 

if tab.history.can_go_forward(): 

text += '>' 

if text: 

text = '[' + text + ']' 

self.setText(text) 

self.setVisible(bool(text) and self.enabled)