127 lines
4.1 KiB
Lua
127 lines
4.1 KiB
Lua
local color = require( "gears.color" )
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local pango = require( "lgi" ).Pango
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local pangocairo = require( "lgi" ).PangoCairo
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local wibox = require( "wibox" )
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local beautiful = require( "beautiful" )
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local scale = pango.SCALE
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local function setup_dpi(box, dpi)
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if box._private.dpi ~= dpi then
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box._private.dpi = dpi
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box._private.ctx:set_resolution(dpi)
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box._private.layout:context_changed()
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end
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end
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--- Setup a pango layout for the given textbox and dpi
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local function setup_layout(box, width, height, dpi)
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-- box._private.layout.width = pango.units_from_double(width) --FIXME...
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box._private.layout.height = pango.units_from_double(height)
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setup_dpi(box, dpi)
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end
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local function fit(self, context,width,height)
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setup_layout(self, width, height, context.dpi)
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-- Compute the optimal font size
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local padding = self._private.padding or 0
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local tm = self._private.top_margin or 0
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height = math.max(0, height - tm)
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local min = math.min(width, height)
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local font_size = math.max(0, min - 2*padding)
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if self._private.force_text then
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self._private.layout.text = self._private.force_text
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end
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self._private.desc:set_size( font_size * scale )
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self._private.layout:set_font_description(self._private.desc)
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local _, geo = self._private.layout:get_pixel_extents()
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if self._private.force_text then
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self._private.layout.text = self._private.text
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end
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return math.min(geo.width, width), math.min(geo.height + tm, height)
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end
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local function draw(self, context, cr, width, height)
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-- Some layouts never call fit()...
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fit(self, context, width, height)
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cr:update_layout(self._private.layout)
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local _, geo = self._private.layout:get_pixel_extents()
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local tm = self._private.top_margin or 0
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local size = math.min(width, height - tm)
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-- Translate the canvas to center the text
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local dy = ( size - geo.height )/2 - geo.y + tm
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local dx = ( size - geo.width )/2 - geo.x
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cr:move_to(0, dy)
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-- Show the text
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cr:show_layout(self._private.layout)
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end
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local function set_text(self, text)
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if tostring(text):len() == 1 then text = text.."_" end--FIXME...
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self._private.layout.text = text
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self._private.text = text
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self:emit_signal("widget::redraw_needed")
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self:emit_signal("widget::layout_changed")
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end
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local function set_padding(self, padding)
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self._private.padding = padding
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self:emit_signal("widget::redraw_needed")
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self:emit_signal("widget::layout_changed")
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end
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local function set_top_margin(self, margin)
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self._private.top_margin = margin or 0
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self:emit_signal("widget::redraw_needed")
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self:emit_signal("widget::layout_changed")
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end
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local function set_width_for_text(self, text)
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self._private.force_text = text
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self:emit_signal("widget::redraw_needed")
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self:emit_signal("widget::layout_changed")
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end
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local function new(text, padding, top_margin)
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local wdg = wibox.widget.base.empty_widget()
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-- Add the basic functions
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rawset(wdg, "draw" , draw )
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rawset(wdg, "fit" , fit )
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rawset(wdg, "set_padding" , set_padding )
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rawset(wdg, "set_top_margin" , set_top_margin )
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rawset(wdg, "set_text" , set_text )
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rawset(wdg, "set_width_for_text", set_width_for_text )
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-- Create the pango objects
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local pango_crx = pangocairo.font_map_get_default():create_context()
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local pango_l = pango.Layout.new(pango_crx)
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local desc = pango.FontDescription()
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pango_l:set_alignment("CENTER")
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desc:set_family( "Verdana" )
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desc:set_weight( pango.Weight.BOLD )
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wdg._private.layout = pango_l
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wdg._private.desc = desc
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wdg._private.ctx = pango_crx
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wdg:emit_signal("widget::layout_changed")
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if text then set_text (wdg, text ) end
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if padding then set_padding (wdg, padding ) end
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if top_margin then set_top_margin(wdg, top_margin) end
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return wdg
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end
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return setmetatable({}, { __call = function(_, ...) return new(...) end })
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