Refactor to support multiple windows/tabs

kitty/layout.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+# vim:fileencoding=utf-8
+# License: GPL v3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
+
+from .constants import WindowGeometry, viewport_size, cell_size
+
+
+def layout_dimension(length, cell_length, number_of_windows=1, border_length=0):
+    number_of_cells = length // cell_length
+    space_needed_for_border = number_of_windows * border_length
+    extra = length - number_of_cells * cell_length
+    while extra < space_needed_for_border:
+        number_of_cells -= 1
+        extra = length - number_of_cells * cell_length
+    extra -= space_needed_for_border
+    pos = (extra // 2) + border_length
+    inner_length = number_of_cells * cell_length
+    window_length = 2 * border_length + inner_length
+    while number_of_windows > 0:
+        number_of_windows -= 1
+        yield pos, number_of_cells
+        pos += window_length
+
+
+class Layout:
+
+    name = None
+
+    def add_window(self, windows, window):
+        raise NotImplementedError()
+
+    def remove_window(self, windows, window):
+        raise NotImplementedError()
+
+    def __call__(self, windows):
+        raise NotImplementedError()
+
+
+class Stack:
+
+    name = 'stack'
+
+    def add_window(self, windows, window):
+        windows.appendleft(window)
+        self(windows)
+
+    def remove_window(self, windows, window):
+        windows.remove(window)
+        self(windows)
+
+    def __call__(self, windows):
+        xstart, xnum = next(layout_dimension(viewport_size.width, cell_size.width))
+        ystart, ynum = next(layout_dimension(viewport_size.height, cell_size.height))
+        wg = WindowGeometry(left=xstart, top=ystart, xnum=xnum, ynum=ynum, right=xstart + cell_size.width * xnum, bottom=ystart + cell_size.height * ynum)
+        for i, w in enumerate(windows):
+            w.is_visible_in_layout = i == 0
+            w.set_geometry(wg)