433 lines
14 KiB
Lua
433 lines
14 KiB
Lua
---------------------------------------------------------------------------
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--- A layout filling all the available space. Each widget is assigned a
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-- ratio (percentage) of the total space. Multiple methods are available to
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-- ajust this ratio.
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--
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--@DOC_wibox_layout_defaults_ratio_EXAMPLE@
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-- @author Emmanuel Lepage Vallee
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-- @copyright 2016 Emmanuel Lepage Vallee
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-- @classmod wibox.layout.ratio
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---------------------------------------------------------------------------
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local base = require("wibox.widget.base" )
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local flex = require("wibox.layout.flex" )
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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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local gmath = require("gears.math")
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local gtable = require("gears.table")
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local unpack = unpack or table.unpack -- luacheck: globals unpack (compatibility with Lua 5.1)
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local ratio = {}
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--@DOC_fixed_COMMON@
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-- Compute the sum of all ratio (ideally, it should be 1)
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local function gen_sum(self, i_s, i_e)
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local sum, new_w = 0,0
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for i = i_s or 1, i_e or #self._private.widgets do
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if self._private.ratios[i] then
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sum = sum + self._private.ratios[i]
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else
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new_w = new_w + 1
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end
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end
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return sum, new_w
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end
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-- The ratios are expressed as percentages. For this to work, the sum of all
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-- ratio must be 1. This function attempt to ajust them. Space can be taken
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-- from or added to a ratio when widgets are being added or removed. If a
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-- specific ratio must be enforced for a widget, it has to be done with the
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-- `ajust_ratio` method after each insertion or deletion
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local function normalize(self)
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local count = #self._private.widgets
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if count == 0 then return end
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-- Instead of adding "if" everywhere, just handle this common case
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if count == 1 then
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self._private.ratios = { 1 }
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return
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end
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local sum, new_w = gen_sum(self)
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local old_count = #self._private.widgets - new_w
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local to_add = (sum == 0) and 1 or (sum / old_count)
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-- Make sure all widgets have a ratio
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for i=1, #self._private.widgets do
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if not self._private.ratios[i] then
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self._private.ratios[i] = to_add
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end
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end
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sum = sum + to_add*new_w
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local delta, new_sum = (1 - sum) / count,0
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-- Increase or decrease each ratio so it the sum become 1
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for i=1, #self._private.widgets do
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self._private.ratios[i] = self._private.ratios[i] + delta
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new_sum = new_sum + self._private.ratios[i]
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end
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-- Floating points is not an exact science, but it should still be close
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-- to 1.00.
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assert(new_sum > 0.99 and new_sum < 1.01)
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end
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function ratio:layout(context, width, height)
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local preliminary_results = {}
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local pos,spacing = 0, self._private.spacing
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local strategy = self:get_inner_fill_strategy()
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local has_stragety = strategy ~= "default"
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local to_redistribute, void_count = 0, 0
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local dir = self._private.dir or "x"
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for k, v in ipairs(self._private.widgets) do
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local space, is_void
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local x, y, w, h, fit_h, fit_w
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if dir == "y" then
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space = height * self._private.ratios[k]
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x, y = 0, gmath.round(pos)
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w, h = width, floor(space)
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else
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space = width * self._private.ratios[k]
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x, y = gmath.round(pos), 0
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w, h = floor(space), height
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end
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-- Keep track of the unused entries
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if has_stragety then
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fit_h, fit_w = base.fit_widget(
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self, context, v,
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dir == "x" and floor(space) or w,
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dir == "y" and floor(space) or h
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)
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is_void = (v.visible == false)
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or (dir == "x" and fit_w == 0)
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or (dir == "y" and fit_h == 0)
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if is_void then
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to_redistribute = to_redistribute + space + spacing
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void_count = void_count + 1
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end
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end
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table.insert(preliminary_results, {v, x, y, w, h, is_void})
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pos = pos + space + spacing
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-- Make sure all widgets fit in the layout, if they aren't, something
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-- went wrong
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if (dir == "y" and gmath.round(pos) >= height) or
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(dir ~= "y" and gmath.round(pos) >= width) then
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break
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end
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end
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local active = #preliminary_results - void_count
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local result, real_pos, space_front = {}, 0, strategy == "right" and
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to_redistribute or (
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strategy == "center" and math.floor(to_redistribute/2) or 0
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)
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-- The number of spaces between `n` element is `n-1`, if there is spaces
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-- outside, then it is `n+1`
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if strategy == "spacing" then
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space_front = (space_front+to_redistribute/(active + 1))
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to_redistribute = (to_redistribute/(active + 1))*(active - 1)
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end
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spacing = strategy:match("spacing")
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and to_redistribute/(active - 1) or 0
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-- Only the `justify` strategy changes the original widget size.
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to_redistribute = (strategy == "justify") and to_redistribute or 0
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for _, entry in ipairs(preliminary_results) do
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local v, x, y, w, h, is_void = unpack(entry)
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-- Redistribute the space or move the widgets
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if strategy ~= "default" then
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if dir == "y" then
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h = is_void and 0 or h + (to_redistribute / (active))
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y = space_front + real_pos
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real_pos = real_pos + h + (is_void and 0 or spacing)
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else
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w = is_void and 0 or w + (to_redistribute / (active))
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x = space_front + real_pos
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real_pos = real_pos + w + (is_void and 0 or spacing)
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end
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end
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table.insert(result, base.place_widget_at(v, x, y, w, h))
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end
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return result
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end
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--- Increase the ratio of "widget"
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-- If the increment produce an invalid ratio (not between 0 and 1), the method
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-- do nothing.
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--
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--@DOC_wibox_layout_ratio_inc_ratio_EXAMPLE@
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--
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-- @tparam number index The widget index to change
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-- @tparam number increment An floating point value between -1 and 1 where the
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-- end result is within 0 and 1
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function ratio:inc_ratio(index, increment)
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if #self._private.widgets == 1 or (not index) or (not self._private.ratios[index])
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or increment < -1 or increment > 1 then
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return
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end
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assert(self._private.ratios[index])
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self:set_ratio(index, self._private.ratios[index] + increment)
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end
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--- Increment the ratio of the first instance of `widget`
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-- If the increment produce an invalid ratio (not between 0 and 1), the method
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-- do nothing.
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-- @param widget The widget to ajust
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-- @tparam number increment An floating point value between -1 and 1 where the
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-- end result is within 0 and 1
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function ratio:inc_widget_ratio(widget, increment)
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if not widget or not increment then return end
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local index = self:index(widget)
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self:inc_ratio(index, increment)
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end
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--- Set the ratio of the widget at position `index`
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-- @tparam number index The index of the widget to change
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-- @tparam number percent An floating point value between 0 and 1
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function ratio:set_ratio(index, percent)
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if not percent or #self._private.widgets == 1 or not index or not self._private.widgets[index]
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or percent < 0 or percent > 1 then
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return
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end
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local old = self._private.ratios[index]
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-- Remove what has to be cleared from all widget
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local delta = ( (percent-old) / (#self._private.widgets-1) )
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for k in pairs(self._private.widgets) do
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self._private.ratios[k] = self._private.ratios[k] - delta
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end
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-- Set the new ratio
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self._private.ratios[index] = percent
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-- As some widgets may now have a slightly negative ratio, normalize again
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normalize(self)
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self:emit_signal("widget::layout_changed")
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end
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--- Get the ratio at `index`.
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-- @tparam number index The widget index to query
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-- @treturn number The index (between 0 and 1)
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function ratio:get_ratio(index)
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if not index then return end
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return self._private.ratios[index]
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end
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--- Set the ratio of `widget` to `percent`.
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-- @tparam widget widget The widget to ajust.
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-- @tparam number percent A floating point value between 0 and 1.
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function ratio:set_widget_ratio(widget, percent)
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local index = self:index(widget)
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self:set_ratio(index, percent)
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end
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--- Update all widgets to match a set of a ratio.
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-- The sum of before, itself and after must be 1 or nothing will be done.
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--
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--@DOC_wibox_layout_ratio_ajust_ratio_EXAMPLE@
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--
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-- @tparam number index The index of the widget to change
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-- @tparam number before The sum of the ratio before the widget
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-- @tparam number itself The ratio for "widget"
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-- @tparam number after The sum of the ratio after the widget
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function ratio:ajust_ratio(index, before, itself, after)
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if not self._private.widgets[index] or not before or not itself or not after then
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return
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end
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local sum = before + itself + after
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-- As documented, it is the caller job to come up with valid numbers
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if math.min(before, itself, after) < 0 then return end
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if sum > 1.01 or sum < -0.99 then return end
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-- Compute the before and after offset to be applied to each widgets
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local before_count, after_count = index-1, #self._private.widgets - index
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local b, a = gen_sum(self, 1, index-1), gen_sum(self, index+1)
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local db, da = (before - b)/before_count, (after - a)/after_count
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-- Apply the new ratio
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self._private.ratios[index] = itself
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-- Equality split the delta among widgets before and after
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for i = 1, index -1 do
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self._private.ratios[i] = self._private.ratios[i] + db
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end
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for i = index+1, #self._private.widgets do
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self._private.ratios[i] = self._private.ratios[i] + da
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end
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-- Remove potential negative ratio
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normalize(self)
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self:emit_signal("widget::layout_changed")
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end
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--- Update all widgets to match a set of a ratio
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-- @param widget The widget to ajust
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-- @tparam number before The sum of the ratio before the widget
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-- @tparam number itself The ratio for "widget"
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-- @tparam number after The sum of the ratio after the widget
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function ratio:ajust_widget_ratio(widget, before, itself, after)
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local index = self:index(widget)
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self:ajust_ratio(index, before, itself, after)
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end
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--- Add some widgets to the given fixed layout
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-- **Signal:** widget::added The argument are the widgets
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-- @tparam widget ... Widgets that should be added (must at least be one)
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function ratio:add(...)
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-- No table.pack in Lua 5.1 :-(
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local args = { n=select('#', ...), ... }
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assert(args.n > 0, "need at least one widget to add")
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for i=1, args.n do
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base.check_widget(args[i])
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table.insert(self._private.widgets, args[i])
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end
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normalize(self)
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self:emit_signal("widget::layout_changed")
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self:emit_signal("widget::added", ...)
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end
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--- Remove a widget from the layout
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-- **Signal:** widget::removed The arguments are the widget and the index
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-- @tparam number index The widget index to remove
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-- @treturn boolean index If the operation is successful
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function ratio:remove(index)
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if not index or not self._private.widgets[index] then return false end
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local w = self._private.widgets[index]
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table.remove(self._private.ratios, index)
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table.remove(self._private.widgets, index)
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normalize(self)
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self:emit_signal("widget::layout_changed")
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self:emit_signal("widget::removed", w, index)
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return true
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end
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--- Insert a new widget in the layout at position `index`
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-- **Signal:** widget::inserted The arguments are the widget and the index
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-- @tparam number index The position
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-- @param widget The widget
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function ratio:insert(index, widget)
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if not index or index < 1 or index > #self._private.widgets + 1 then return false end
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base.check_widget(widget)
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table.insert(self._private.widgets, index, widget)
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normalize(self)
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self:emit_signal("widget::layout_changed")
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self:emit_signal("widget::inserted", widget, #self._private.widgets)
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end
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--- Set how the space of invisible or `0x0` sized widget is redistributed.
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--
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-- Possible values:
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--
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-- * "default": Honor the ratio and do not redistribute the space.
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-- * "justify": Distribute the space among remaining widgets.
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-- * "center": Squash remaining widgets and leave equal space on both side.
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-- * "inner_spacing": Add equal spacing between all widgets.
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-- * "spacing": Add equal spacing between all widgets and on the outside.
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-- * "left": Squash remaining widgets and leave empty space on the left.
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-- * "right": Squash remaining widgets and leave empty space on the right.
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--
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--@DOC_wibox_layout_ratio_strategy_EXAMPLE@
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--
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-- @property inner_fill_strategy
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-- @tparam string inner_fill_strategy One of the value listed above.
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function ratio:get_inner_fill_strategy()
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return self._private.inner_fill_strategy or "default"
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end
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local valid_strategies = {
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default = true,
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justify = true,
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center = true,
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inner_spacing = true,
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spacing = true,
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left = true,
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right = true
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}
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function ratio:set_inner_fill_strategy(strategy)
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assert(valid_strategies[strategy] ~= nil, "Invalid strategy: "..(strategy or ""))
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self._private.inner_fill_strategy = strategy
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self:emit_signal("widget::layout_changed")
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end
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local function get_layout(dir, widget1, ...)
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local ret = flex[dir](widget1, ...)
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gtable.crush(ret, ratio, true)
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ret._private.fill_space = nil
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ret._private.ratios = {}
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return ret
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end
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--- Returns a new horizontal ratio layout. A ratio layout shares the available space
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-- equally among all widgets. Widgets can be added via :add(widget).
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-- @tparam widget ... Widgets that should be added to the layout.
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function ratio.horizontal(...)
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return get_layout("horizontal", ...)
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end
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--- Returns a new vertical ratio layout. A ratio layout shares the available space
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-- equally among all widgets. Widgets can be added via :add(widget).
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-- @tparam widget ... Widgets that should be added to the layout.
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function ratio.vertical(...)
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return get_layout("vertical", ...)
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end
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--@DOC_widget_COMMON@
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--@DOC_object_COMMON@
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return ratio
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-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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