144 lines
3.6 KiB
Lua
144 lines
3.6 KiB
Lua
---------------------------------------------------------------------------
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-- @author Lukáš Hrázký
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-- @copyright 2012 Lukáš Hrázký
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-- @release @AWESOME_VERSION@
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---------------------------------------------------------------------------
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local pairs = pairs
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local type = type
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local setmetatable = setmetatable
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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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local math = math
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-- wibox.layout.constraint
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local constraint = { mt = {} }
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--- Draw a constraint layout
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function constraint:draw(wibox, cr, width, height)
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if not self.widget then
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return
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end
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local w, h = self:fit(width, height)
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base.draw_widget(wibox, cr, self.widget, 0, 0, w, h)
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end
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--- Fit a constraint layout into the given space
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function constraint:fit(width, height)
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local w, h
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if self.widget then
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w, h = self.widget:fit(width, height)
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else
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w, h = 0, 0
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end
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if self._width > 0 then
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if self.strategy == "exact" then
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w = self._width
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else
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w = math[self.strategy](w, self._width)
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end
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end
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if self._height > 0 then
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if self.strategy == "exact" then
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h = self._height
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else
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h = math[self.strategy](h, self._height)
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end
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end
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return w, h
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end
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--- Set the widget that this layout adds a constraint on.
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function constraint:set_widget(widget)
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if self.widget then
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self.widget:disconnect_signal("widget::updated", self._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", self._emit_updated)
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end
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self.widget = widget
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self:emit_signal("widget::updated")
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end
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--- Set the strategy to use for the constraining. Valid values are 'max',
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-- 'min' or 'exact'. Throws an error on invalid values.
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function constraint:set_strategy(val)
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local allowed = {
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max = true,
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min = true,
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exact = true
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}
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if not allowed[val] then
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error("Invalid strategy for constraint layout: " .. tostring(val))
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end
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self.strategy = val
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self:emit_signal("widget::updated")
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end
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--- Set the maximum width to val.
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function constraint:set_width(val)
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self._width = val
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self:emit_signal("widget::updated")
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end
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--- Set the maximum height to val.
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function constraint:set_height(val)
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self._height = val
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self:emit_signal("widget::updated")
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end
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--- Reset this layout. The widget will be unreferenced, strategy set to "max"
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-- and the constraints set to 0.
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function constraint:reset()
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self.strategy = "max"
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self._width = 0
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self._height = 0
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self:set_widget(nil)
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end
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--- Returns a new constraint layout.
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-- @param widget A widget to use (optional)
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-- @param strategy How to constraint the size. 'max' (default), 'min' or
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-- 'exact'. (optional)
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-- @param width The maximum width of the widget. 0 for no limit. (optional)
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-- @param height The maximum height of the widget. 0 for no limit. (optional)
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local function new(widget, strategy, width, height)
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local ret = widget_base.make_widget()
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for k, v in pairs(constraint) 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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ret:set_strategy(strategy or "max")
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ret:set_width(width or 0)
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ret:set_height(height or 0)
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if widget then
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ret:set_widget(widget)
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end
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return ret
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end
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function constraint.mt:__call(...)
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return new(...)
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end
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return setmetatable(constraint, constraint.mt)
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-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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