142 lines
4.3 KiB
Lua
142 lines
4.3 KiB
Lua
---------------------------------------------------------------------------
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-- @author Uli Schlachter
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-- @author dodo
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-- @copyright 2010, 2011 Uli Schlachter, dodo
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-- @release @AWESOME_VERSION@
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---------------------------------------------------------------------------
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local base = require("wibox.widget.base")
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local beautiful = require("beautiful")
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local lgi = require("lgi")
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local cairo = lgi.cairo
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local Pango = lgi.Pango
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local PangoCairo = lgi.PangoCairo
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local type = type
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local unpack = unpack
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local setmetatable = setmetatable
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local pairs = pairs
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local error = error
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module("wibox.widget.textbox")
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-- Setup a pango layout for the given textbox and cairo context
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local function setup_layout(box, width, height)
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local layout = box._layout
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layout.width = Pango.units_from_double(width)
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layout.height = Pango.units_from_double(height)
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end
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--- Draw the given textbox on the given cairo context in the given geometry
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function draw(box, wibox, cr, width, height)
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cr:update_layout(box._layout)
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setup_layout(box, width, height)
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local ink, logical = box._layout:get_pixel_extents()
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local offset = 0
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if box._valign == "center" then
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offset = (height - logical.height) / 2
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elseif box._valign == "bottom" then
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offset = height - logical.height
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end
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cr:move_to(0, offset)
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cr:show_layout(box._layout)
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end
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--- Fit the given textbox
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function fit(box, width, height)
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setup_layout(box, width, height)
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local ink, logical = box._layout:get_pixel_extents()
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return logical.width, logical.height
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end
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--- Set a textbox' text.
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-- @param text The text to set. This can contain pango markup (e.g. <b>bold</b>)
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function set_markup(box, text)
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local attr, parsed = Pango.parse_markup(text, -1, 0)
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-- In case of error, attr is false and parsed is an error message
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if not attr then error(parsed) end
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box._layout.text = parsed
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box._layout.attributes = attr
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box:emit_signal("widget::updated")
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end
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--- Set a textbox' text.
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-- @param text The text to display. Pango markup is ignored and shown as-is.
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function set_text(box, text)
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box._layout.text = text
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box._layout.attributes = nil
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box:emit_signal("widget::updated")
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end
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--- Set a textbox' ellipsize mode.
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-- @param mode Where should long lines be shortened? "start", "middle" or "end"
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function set_ellipsize(box, mode)
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local allowed = { none = "NONE", start = "START", middle = "MIDDLE", ["end"] = "END" }
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if allowed[mode] then
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box._layout:set_ellipsize(allowed[mode])
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box:emit_signal("widget::updated")
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end
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end
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--- Set a textbox' wrap mode.
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-- @param mode Where to wrap? After "word", "char" or "word_char"
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function set_wrap(box, mode)
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local allowed = { word = "WORD", char = "CHAR", word_char = "WORD_CHAR" }
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if allowed[mode] then
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box._layout:set_wrap(allowed[mode])
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box:emit_signal("widget::updated")
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end
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end
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--- Set a textbox' vertical alignment
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-- @param mode Where should the textbox be drawn? "top", "center" or "bottom"
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function set_valign(box, mode)
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local allowed = { top = true, center = true, bottom = true }
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if allowed[mode] then
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box._valign = mode
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box:emit_signal("widget::updated")
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end
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end
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--- Set a textbox' horizontal alignment
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-- @param mode Where should the textbox be drawn? "left", "center" or "right"
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function set_align(box, mode)
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local allowed = { left = "LEFT", center = "CENTER", right = "RIGHT" }
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if allowed[mode] then
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box._layout:set_alignment(allowed[mode])
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box:emit_signal("widget::updated")
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end
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end
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--- Set a textbox' font
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-- @param font The font description as string
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function set_font(box, font)
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box._layout:set_font_description(beautiful.get_font(font))
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end
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-- Returns a new textbox
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local function new()
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local ret = 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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local ctx = PangoCairo.font_map_get_default():create_context()
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ret._layout = Pango.Layout.new(ctx)
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ret:set_ellipsize("end")
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ret:set_wrap("word_char")
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ret:set_valign("center")
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ret:set_align("left")
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ret:set_font()
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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:textwidth=80
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