refactor buffers

This splits buffers.py, which contained all buffer classes, into several smaller files.
issue #1226

1 files changed, 66 insertions, 0 deletions

diff --git a/alot/buffers/bufferlist.py b/alot/buffers/bufferlist.py
new file mode 100644
index 00000000..db6395de
--- /dev/null
+++ b/alot/buffers/bufferlist.py
@@ -0,0 +1,66 @@
+# Copyright (C) 2011-2018  Patrick Totzke <patricktotzke@gmail.com>
+# This file is released under the GNU GPL, version 3 or a later revision.
+# For further details see the COPYING file
+from __future__ import absolute_import
+import urwid
+
+from .buffer import Buffer
+from ..widgets.bufferlist import BufferlineWidget
+from ..settings.const import settings
+
+
+class BufferlistBuffer(Buffer):
+    """lists all active buffers"""
+
+    modename = 'bufferlist'
+
+    def __init__(self, ui, filtfun=lambda x: x):
+        self.filtfun = filtfun
+        self.ui = ui
+        self.isinitialized = False
+        self.rebuild()
+        Buffer.__init__(self, ui, self.body)
+
+    def index_of(self, b):
+        """
+        returns the index of :class:`Buffer` `b` in the global list of active
+        buffers.
+        """
+        return self.ui.buffers.index(b)
+
+    def rebuild(self):
+        if self.isinitialized:
+            focusposition = self.bufferlist.get_focus()[1]
+        else:
+            focusposition = 0
+            self.isinitialized = True
+
+        lines = list()
+        displayedbuffers = [b for b in self.ui.buffers if self.filtfun(b)]
+        for (num, b) in enumerate(displayedbuffers):
+            line = BufferlineWidget(b)
+            if (num % 2) == 0:
+                attr = settings.get_theming_attribute('bufferlist',
+                                                      'line_even')
+            else:
+                attr = settings.get_theming_attribute('bufferlist', 'line_odd')
+            focus_att = settings.get_theming_attribute('bufferlist',
+                                                       'line_focus')
+            buf = urwid.AttrMap(line, attr, focus_att)
+            num = urwid.Text('%3d:' % self.index_of(b))
+            lines.append(urwid.Columns([('fixed', 4, num), buf]))
+        self.bufferlist = urwid.ListBox(urwid.SimpleListWalker(lines))
+        num_buffers = len(displayedbuffers)
+        if focusposition is not None and num_buffers > 0:
+            self.bufferlist.set_focus(focusposition % num_buffers)
+        self.body = self.bufferlist
+
+    def get_selected_buffer(self):
+        """returns currently selected :class:`Buffer` element from list"""
+        linewidget, _ = self.bufferlist.get_focus()
+        bufferlinewidget = linewidget.get_focus().original_widget
+        return bufferlinewidget.get_buffer()
+
+    def focus_first(self):
+        """Focus the first line in the buffer list."""
+        self.body.set_focus(0)