148 lines
3.8 KiB
Lua
148 lines
3.8 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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-- @classmod wibox.widget.imagebox
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---------------------------------------------------------------------------
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local base = require("wibox.widget.base")
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local surface = require("gears.surface")
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local setmetatable = setmetatable
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local pairs = pairs
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local type = type
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local pcall = pcall
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local print = print
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local imagebox = { mt = {} }
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--- Draw an imagebox with the given cairo context in the given geometry.
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function imagebox:draw(context, cr, width, height)
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if not self._image then return end
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if width == 0 or height == 0 then return end
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if not self.resize_forbidden then
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-- Let's scale the image so that it fits into (width, height)
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local w = self._image:get_width()
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local h = self._image:get_height()
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local aspect = width / w
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local aspect_h = height / h
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if aspect > aspect_h then aspect = aspect_h end
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cr:scale(aspect, aspect)
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end
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cr:set_source_surface(self._image, 0, 0)
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cr:paint()
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end
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--- Fit the imagebox into the given geometry
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function imagebox:fit(context, width, height)
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if not self._image then
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return 0, 0
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end
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local w = self._image:get_width()
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local h = self._image:get_height()
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if w > width then
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h = h * width / w
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w = width
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end
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if h > height then
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w = w * height / h
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h = height
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end
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if h == 0 or w == 0 then
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return 0, 0
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end
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if not self.resize_forbidden then
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local aspect = width / w
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local aspect_h = height / h
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-- Use the smaller one of the two aspect ratios.
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if aspect > aspect_h then aspect = aspect_h end
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w, h = w * aspect, h * aspect
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end
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return w, h
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end
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--- Set an imagebox' image
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-- @param image Either a string or a cairo image surface. A string is
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-- interpreted as the path to a png image file.
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function imagebox:set_image(image)
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local image = image
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if type(image) == "string" then
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local success, result = pcall(surface.load, image)
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if not success then
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print("Error while reading '" .. image .. "': " .. result)
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print(debug.traceback())
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return false
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end
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image = result
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end
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image = surface.load(image)
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if image then
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local w = image.width
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local h = image.height
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if w <= 0 or h <= 0 then
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return false
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end
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end
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if self._image == image then
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return
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end
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self._image = image
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self:emit_signal("widget::redraw_needed")
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self:emit_signal("widget::layout_changed")
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return true
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end
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--- Should the image be resized to fit into the available space?
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-- @param allowed If false, the image will be clipped, else it will be resized
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-- to fit into the available space.
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function imagebox:set_resize(allowed)
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self.resize_forbidden = not allowed
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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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--- Returns a new imagebox
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-- @param image the image to display, may be nil
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-- @param resize_allowed If false, the image will be clipped, else it will be resized
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-- to fit into the available space.
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local function new(image, resize_allowed)
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local ret = base.make_widget()
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for k, v in pairs(imagebox) 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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if image then
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ret:set_image(image)
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end
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if resize_allowed ~= nil then
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ret:set_resize(resize_allowed)
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end
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return ret
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end
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function imagebox.mt:__call(...)
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return new(...)
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end
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return setmetatable(imagebox, imagebox.mt)
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-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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