150 lines
4.4 KiB
Lua
150 lines
4.4 KiB
Lua
---------------------------------------------------------------------------
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-- @author Uli Schlachter
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-- @copyright 2010 Uli Schlachter
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-- @release @AWESOME_VERSION@
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---------------------------------------------------------------------------
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local setmetatable = setmetatable
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local table = table
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local pairs = pairs
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local type = type
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local base = require("wibox.layout.base")
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local widget_base = require("wibox.widget.base")
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module("wibox.layout.align")
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-- Draw the given align layout. dir describes the orientation of the layout, "x"
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-- means horizontal while "y" is vertical.
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local function draw(dir, layout, wibox, cr, width, height)
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local size_first = 0
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local size_third = 0
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local size_limit = dir == "y" and height or width
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if layout.first then
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local w, h = width, height
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if dir == "y" then
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_, h = layout.first:fit(w, h)
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size_first = h
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else
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w, _ = layout.first:fit(w, h)
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size_first = w
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end
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base.draw_widget(wibox, cr, layout.first, 0, 0, w, h)
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end
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if layout.third and size_first < size_limit then
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local w, h, x, y
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if dir == "y" then
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w, h = width, height - size_first
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_, h = layout.third:fit(w, h)
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x, y = 0, height - h
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size_third = h
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else
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w, h = width - size_first, height
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w, _ = layout.third:fit(w, h)
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x, y = width - w, 0
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size_third = w
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end
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base.draw_widget(wibox, cr, layout.third, x, y, w, h)
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end
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if layout.second and size_first + size_third < size_limit then
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local x, y, w, h
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if dir == "y" then
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x, y = 0, size_first
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w, h = width, size_limit - size_first - size_third
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else
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x, y = size_first, 0
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w, h = size_limit - size_first - size_third, height
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end
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base.draw_widget(wibox, cr, layout.second, x, y, w, h)
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end
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end
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local function widget_changed(layout, old_w, new_w)
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if old_w then
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old_w:disconnect_signal("widget::updated", layout._emit_updated)
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end
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if new_w then
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widget_base.check_widget(new_w)
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new_w:connect_signal("widget::updated", layout._emit_updated)
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end
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layout._emit_updated()
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end
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--- Set the layout's first widget. This is the widget that is at the left/top
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function set_first(layout, widget)
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widget_changed(layout, layout.first, widget)
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layout.first = widget
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end
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--- Set the layout's second widget. This is the centered one.
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function set_second(layout, widget)
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widget_changed(layout, layout.second, widget)
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layout.second = widget
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end
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--- Set the layout's third widget. This is the widget that is at the right/bottom
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function set_third(layout, widget)
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widget_changed(layout, layout.third, widget)
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layout.third = widget
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end
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function reset(layout)
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for k, v in pairs({ "first", "second", "third" }) do
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layout[v] = nil
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end
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layout:emit_signal("widget::updated")
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end
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local function get_layout(dir)
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local function draw_dir(layout, wibox, cr, width, height)
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draw(dir, layout, wibox, cr, width, height)
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end
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local ret = widget_base.make_widget()
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ret.draw = draw_dir
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ret.fit = function(box, ...) return ... end
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ret._emit_updated = function()
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ret:emit_signal("widget::updated")
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end
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for k, v in pairs(_M) do
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if type(v) == "function" then
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ret[k] = v
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end
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end
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return ret
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end
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--- Returns a new horizontal align layout. An align layout can display up to
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-- three widgets. The widget set via :set_left() is left-aligned. :set_right()
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-- sets a widget which will be right-aligned. The remaining space between those
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-- two will be given to the widget set via :set_middle().
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function horizontal()
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local ret = get_layout("x")
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ret.set_left = ret.set_first
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ret.set_middle = ret.set_second
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ret.set_right = ret.set_third
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return ret
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end
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--- Returns a new vertical align layout. An align layout can display up to
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-- three widgets. The widget set via :set_top() is top-aligned. :set_bottom()
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-- sets a widget which will be bottom-aligned. The remaining space between those
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-- two will be given to the widget set via :set_middle().
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function vertical()
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local ret = get_layout("y")
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ret.set_top = ret.set_first
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ret.set_middle = ret.set_second
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ret.set_bottom = ret.set_third
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return ret
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end
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-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
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