109 lines
3.0 KiB
Lua
109 lines
3.0 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 base = require("wibox.layout.base")
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local fixed = require("wibox.layout.fixed")
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local widget_base = require("wibox.widget.base")
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local table = table
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local pairs = pairs
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local floor = math.floor
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module("wibox.layout.flex")
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local function round(x)
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return floor(x + 0.5)
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end
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--- Draw a flex layout. Each widget gets an equal share of the available space
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-- @param dir "x" for a horizontal layout and "y" for vertical.
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-- @param widgets The widgets to draw.
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-- @param cr The cairo context to use.
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-- @param width The available width.
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-- @param height The available height.
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-- @return The total space needed by the layout.
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function draw_flex(dir, widgets, wibox, cr, width, height)
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local pos = 0
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local num = #widgets
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local space_per_item
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if dir == "y" then
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space_per_item = height / num
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else
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space_per_item = width / num
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end
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for k, v in pairs(widgets) do
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local x, y, w, h
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if dir == "y" then
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x, y = 0, round(pos)
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w, h = width, floor(space_per_item)
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else
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x, y = round(pos), 0
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w, h = floor(space_per_item), height
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end
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base.draw_widget(wibox, cr, v, x, y, w, h)
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pos = pos + space_per_item
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if (dir == "y" and pos >= height) or
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(dir ~= "y" and pos >= width) then
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break
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end
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end
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end
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local function add(layout, widget)
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widget_base.check_widget(widget)
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table.insert(layout.widgets, widget)
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widget:connect_signal("widget::updated", layout._emit_updated)
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layout._emit_updated()
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end
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local function reset(layout)
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for k, v in pairs(layout.widgets) do
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v:disconnect_signal("widget::updated", layout._emit_updated)
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end
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layout.widgets = {}
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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(layout, wibox, cr, width, height)
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draw_flex(dir, layout.widgets, wibox, cr, width, height)
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end
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local function fit(layout, width, height)
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return fixed.fit_fixed(dir, layout.widgets, width, height)
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end
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local ret = widget_base.make_widget()
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ret.draw = draw
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ret.fit = fit
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ret.add = add
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ret.reset = reset
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ret.widgets = {}
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ret.get_dir = function () return dir 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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--- Returns a new horizontal flex layout. A flex layout shares the available space
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-- equally among all widgets. Widgets can be added via :add(widget).
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function horizontal()
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return get_layout("x")
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end
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--- Returns a new vertical flex layout. A flex layout shares the available space
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-- equally among all widgets. Widgets can be added via :add(widget).
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function vertical()
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return get_layout("y")
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end
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-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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