84 lines
2.6 KiB
Lua
84 lines
2.6 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.layout.base
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---------------------------------------------------------------------------
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local xpcall = xpcall
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local print = print
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local cairo = require("lgi").cairo
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local wbase = require("wibox.widget.base")
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local base = {}
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--- Fit a widget for the given available width and height
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-- @param context The context in which we are fit.
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-- @param widget The widget to fit (this uses widget:fit(width, height)).
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-- @param width The available width for the widget
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-- @param height The available height for the widget
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-- @return The width and height that the widget wants to use
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function base.fit_widget(context, widget, width, height)
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if not widget.visible then
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return 0, 0
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end
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-- Sanitize the input. This also filters out e.g. NaN.
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local width = math.max(0, width)
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local height = math.max(0, height)
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local w, h = widget:fit(context, width, height)
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-- Also sanitize the output.
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w = math.max(0, math.min(w, width))
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h = math.max(0, math.min(h, height))
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return w, h
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end
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--- Draw a widget via a cairo context
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-- @param context The context in which we are drawn.
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-- @param cr The cairo context used
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-- @param widget The widget to draw (this uses widget:draw(cr, width, height)).
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-- @param x The position that the widget should get
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-- @param y The position that the widget should get
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-- @param width The widget's width
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-- @param height The widget's height
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function base.draw_widget(context, cr, widget, x, y, width, height)
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if not widget.visible then
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return
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end
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-- Use save() / restore() so that our modifications aren't permanent
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cr:save()
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-- Move (0, 0) to the place where the widget should show up
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cr:translate(x, y)
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-- Make sure the widget cannot draw outside of the allowed area
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cr:rectangle(0, 0, width, height)
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cr:clip()
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if widget.opacity ~= 1 then
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cr:push_group()
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end
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-- Let the widget draw itself
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xpcall(function()
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widget:draw(context, cr, width, height)
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end, function(err)
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print(debug.traceback("Error while drawing widget: "..tostring(err), 2))
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end)
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if widget.opacity ~= 1 then
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cr:pop_group_to_source()
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cr.operator = cairo.Operator.OVER
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cr:paint_with_alpha(widget.opacity)
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end
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-- Register the widget for input handling
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context:widget_at(widget, wbase.rect_to_device_geometry(cr, 0, 0, width, height))
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cr:restore()
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end
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return base
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-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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