124 lines
3.4 KiB
Lua
124 lines
3.4 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 error = error
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local pairs = pairs
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local pi = math.pi
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local type = type
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local setmetatable = setmetatable
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local tostring = tostring
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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.rotate")
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local function transform(layout, width, height)
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local dir = layout:get_direction()
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if dir == "east" or dir == "west" then
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return height, width
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end
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return width, height
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end
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--- Draw this layout
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function draw(layout, wibox, cr, width, height)
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if not layout.widget then return { width = 0, height = 0 } end
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cr:save()
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local dir = layout:get_direction()
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if dir == "west" then
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cr:rotate(pi / 2)
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cr:translate(0, -width)
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elseif dir == "south" then
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cr:rotate(pi)
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cr:translate(-width, -height)
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elseif dir == "east" then
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cr:rotate(3 * pi / 2)
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cr:translate(-height, 0)
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end
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-- Since we rotated, we might have to swap width and height.
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-- transform() does that for us.
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layout.widget:draw(wibox, cr, transform(layout, width, height))
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-- Undo the rotation and translation from above.
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cr:restore()
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end
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--- Fit this layout into the given area
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function fit(layout, width, height)
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if not layout.widget then
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return 0, 0
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end
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return transform(layout, layout.widget:fit(transform(layout, width, height)))
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end
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--- Set the widget that this layout rotates.
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function set_widget(layout, widget)
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if layout.widget then
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layout.widget:disconnect_signal("widget::updated", layout._emit_updated)
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end
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if widget then
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widget_base.check_widget(widget)
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widget:connect_signal("widget::updated", layout._emit_updated)
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end
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layout.widget = widget
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layout._emit_updated()
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end
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--- Reset this layout. The widget will be removed and the rotation reset.
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function reset(layout)
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layout.direction = nil
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layout:set_widget(nil)
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end
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--- Set the direction of this rotating layout. Valid values are "north", "east",
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-- "south" and "west". On an invalid value, this function will throw an error.
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function set_direction(layout, dir)
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local allowed = {
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north = true,
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east = true,
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south = true,
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west = true
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}
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if not allowed[dir] then
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error("Invalid direction for rotate layout: " .. tostring(dir))
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end
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layout.direction = dir
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layout._emit_updated()
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end
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--- Get the direction of this rotating layout
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function get_direction(layout)
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return layout.direction or "north"
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end
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--- Returns a new rotate layout. A rotate layout rotates a given widget. Use
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-- :set_widget() to set the widget and :set_direction() for the direction.
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-- The default direction is "north" which doesn't change anything.
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local function new()
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local ret = widget_base.make_widget()
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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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ret._emit_updated = function()
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ret:emit_signal("widget::updated")
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end
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return ret
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end
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setmetatable(_M, { __call = function(_, ...) return new(...) end })
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-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
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