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# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
# Copyright 2017-2021 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 <https://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.widget.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)
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