Class wibox.widget.piechart
Display percentage in a circle.
 Note that this widget makes no attempts to prevent overlapping labels or
 labels drawn outside of the widget boundaries.

    Usage:
    wibox.widget {
    data_list = {
        { 'L1', 100 },
        { 'L2', 200 },
        { 'L3', 300 },
    },
    border_width = 1,
    colors = {
        beautiful.bg_normal,
        beautiful.bg_highlight,
        beautiful.border_color,
    },
    widget = wibox.widget.piechart
}
    
    Info:
    
        - Copyright: 2012 Emmanuel Lepage Vallee
- Author: Emmanuel Lepage Valle
    - 
    
    wibox.widget.piechart.data_list
    
- 
    The pie chart data list.
    Type:
        - data_list
            table
         Sorted table where each entry has a label as its
 first value and a number as its second value.
        
 
- 
    
    wibox.widget.piechart.data
    
- 
    The pie chart data.
    Type:
        - data
            table
         Labels as keys and number as value.
        
 
- 
    
    wibox.widget.piechart.border_color
    
- 
    The border color.
 If none is set, it will use current foreground (text) color.
  
 Type:See also:
- 
    
    wibox.widget.piechart.border_width
    
- 
    The pie elements border width. 
  
 Type:
        - border_width
            number
         (default 1)
        
 
- 
    
    wibox.widget.piechart.colors
    
- 
    The pie chart colors.
 If no color is set, only the border will be drawn. If less colors than
 required are set, colors will be re-used in order.
    Type:
        - colors
            table
         A table of colors, one for each elements
        
 See also:
- 
    
    wibox.widget.piechart.display_labels
    
- 
    If the pie chart has labels. 
  
 Type:
- 
    
    wibox.widget.piechart.forced_height
    
- 
    Force a widget height.
    Type:
        - height
            number or nil
         The height (nilfor automatic)
 
- 
    
    wibox.widget.piechart.forced_width
    
- 
    Force a widget width.
    Type:
        - width
            number or nil
         The width (nilfor automatic)
 
- 
    
    wibox.widget.piechart.opacity
    
- 
    The widget opacity (transparency).
    Type:
        - opacity
            number
         The opacity (between 0 and 1)
         (default 1)
        
 
- 
    
    wibox.widget.piechart.visible
    
- 
    The widget visibility.
    Type:
    - 
    
    widget::layout_changed
    
- 
    When the layout (size) change.
 This signal is emitted when the previous results of :layout()and:fit()are no longer valid.  Unless this signal is emitted,:layout()and:fit()must return the same result when called with the same arguments.See also:
- 
    
    widget::redraw_needed
    
- 
    When the widget content changed.
 This signal is emitted when the content of the widget changes. The widget will
 be redrawn, it is not re-layouted. Put differently, it is assumed that
 :layout()and:fit()would still return the same results as before.See also:
- 
    
    button::press
    
- 
    When a mouse button is pressed over the widget.
    Arguments:
        - lx
            number
         The horizontal position relative to the (0,0) position in
 the widget.
        
- ly
            number
         The vertical position relative to the (0,0) position in the
 widget.
        
- button
            number
         The button number.
        
- mods
            table
         The modifiers (mod4, mod1 (alt), Control, Shift)
        
- find_widgets_result The entry from the result of
 wibox.drawable:find_widgets for the position that the mouse hit.
        
        - drawable
            wibox.drawable
         The drawable containing
 the widget.
        
- widget
            widget
         The widget being displayed.
        
- hierarchy
            wibox.hierarchy
         The hierarchy
 managing the widget's geometry.
        
- x
            number
         An approximation of the X position that
 the widget is visible at on the surface.
        
- y
            number
         An approximation of the Y position that
 the widget is visible at on the surface.
        
- width
            number
         An approximation of the width that
 the widget is visible at on the surface.
        
- height
            number
         An approximation of the height that
 the widget is visible at on the surface.
        
- widget_width
            number
         The exact width of the widget
 in its local coordinate system.
        
- widget_height
            number
         The exact height of the widget
 in its local coordinate system.
        
 
 See also:
- 
    
    button::release
    
- 
    When a mouse button is released over the widget.
    Arguments:
        - lx
            number
         The horizontal position relative to the (0,0) position in
 the widget.
        
- ly
            number
         The vertical position relative to the (0,0) position in the
 widget.
        
- button
            number
         The button number.
        
- mods
            table
         The modifiers (mod4, mod1 (alt), Control, Shift)
        
- find_widgets_result The entry from the result of
 wibox.drawable:find_widgets for the position that the mouse hit.
        
        - drawable
            wibox.drawable
         The drawable containing
 the widget.
        
- widget
            widget
         The widget being displayed.
        
- hierarchy
            wibox.hierarchy
         The hierarchy
 managing the widget's geometry.
        
- x
            number
         An approximation of the X position that
 the widget is visible at on the surface.
        
- y
            number
         An approximation of the Y position that
 the widget is visible at on the surface.
        
- width
            number
         An approximation of the width that
 the widget is visible at on the surface.
        
- height
            number
         An approximation of the height that
 the widget is visible at on the surface.
        
- widget_width
            number
         The exact width of the widget
 in its local coordinate system.
        
- widget_height
            number
         The exact height of the widget
 in its local coordinate system.
        
 
 See also:
- 
    
    mouse::enter
    
- 
    When the mouse enter a widget.
    Arguments:
        - find_widgets_result The entry from the result of
 wibox.drawable:find_widgets for the position that the mouse hit.
        
        - drawable
            wibox.drawable
         The drawable containing
 the widget.
        
- widget
            widget
         The widget being displayed.
        
- hierarchy
            wibox.hierarchy
         The hierarchy
 managing the widget's geometry.
        
- x
            number
         An approximation of the X position that
 the widget is visible at on the surface.
        
- y
            number
         An approximation of the Y position that
 the widget is visible at on the surface.
        
- width
            number
         An approximation of the width that
 the widget is visible at on the surface.
        
- height
            number
         An approximation of the height that
 the widget is visible at on the surface.
        
- widget_width
            number
         The exact width of the widget
 in its local coordinate system.
        
- widget_height
            number
         The exact height of the widget
 in its local coordinate system.
        
 
 See also:
- 
    
    mouse::leave
    
- 
    When the mouse leave a widget.
    Arguments:
        - find_widgets_result The entry from the result of
 wibox.drawable:find_widgets for the position that the mouse hit.
        
        - drawable
            wibox.drawable
         The drawable containing
 the widget.
        
- widget
            widget
         The widget being displayed.
        
- hierarchy
            wibox.hierarchy
         The hierarchy
 managing the widget's geometry.
        
- x
            number
         An approximation of the X position that
 the widget is visible at on the surface.
        
- y
            number
         An approximation of the Y position that
 the widget is visible at on the surface.
        
- width
            number
         An approximation of the width that
 the widget is visible at on the surface.
        
- height
            number
         An approximation of the height that
 the widget is visible at on the surface.
        
- widget_width
            number
         The exact width of the widget
 in its local coordinate system.
        
- widget_height
            number
         The exact height of the widget
 in its local coordinate system.
        
 
 See also:
    - 
    
    beautiful.piechart_border_color
    
- 
    The border color.
 If none is set, it will use current foreground (text) color.
    Type:See also:
- 
    
    beautiful.piechart_border_width
    
- 
    The pie elements border width.
    Type:
        - border_width
            number
         (default 1)
        
 
- 
    
    beautiful.piechart_colors
    
- 
    The pie chart colors.
 If no color is set, only the border will be drawn. If less colors than
 required are set, colors will be re-used in order.
    Type:
        - colors
            table
         A table of colors, one for each elements
        
 See also:
    - 
    
    wibox.widget.piechart:index (widget[, recursive[, ...]])
    
- 
    Get a widex index.
    
        - widget
         The widget to look for
        
- recursive
         Also check sub-widgets
         (optional)
        
- ...
         Aditional widgets to add at the end of the \"path\"
         (optional)
        
 Returns:
        - 
        The index
- 
        The parent layout
- 
        The path between \"self\" and \"widget\"
 
- 
    
    wibox.widget.piechart:get_all_children ()
    
- 
    Get all direct and indirect children widgets.
 This will scan all containers recursively to find widgets
 Warning: This method it prone to stack overflow id the widget, or any of its
 children, contain (directly or indirectly) itself.
    Returns:
           table
        The children
     
- 
    
    wibox.widget.piechart:setup (args)
    
- 
    Set a declarative widget hierarchy description.
 See The declarative layout system
    
        - args
         An array containing the widgets disposition
        
 
- 
    
    wibox.widget.piechart:buttons (_buttons)
    
- 
    Set/get a widget's buttons.
    
        - _buttons
         The table of buttons that should bind to the widget.
        
 
- 
    
    wibox.widget.piechart:emit_signal_recursive (signal_name, ...)
    
- 
    Emit a signal and ensure all parent widgets in the hierarchies also
 forward the signal.  This is useful to track signals when there is a dynamic
 set of containers and layouts wrapping the widget.
    
        - signal_name
            string
        
- ...
         Other arguments
        
 
- 
    
    wibox.widget.piechart:disconnect_signal (name, func)
    
- 
    Disconnect to a signal.
    
        - name
            string
         The name of the signal
        
- func
            function
         The callback that should be disconnected
        
 
- 
    
    wibox.widget.piechart:emit_signal (name, ...)
    
- 
    Emit a signal.
    
        - name
            string
         The name of the signal
        
- ...
         Extra arguments for the callback functions. Each connected
   function receives the object as first argument and then any extra arguments
   that are given to emit_signal()
        
 
- 
    
    wibox.widget.piechart:connect_signal (name, func)
    
- 
    Connect to a signal.
    
        - name
            string
         The name of the signal
        
- func
            function
         The callback to call when the signal is emitted
        
 
- 
    
    wibox.widget.piechart:weak_connect_signal (name, func)
    
- 
    Connect to a signal weakly.  This allows the callback function to be garbage
 collected and automatically disconnects the signal when that happens.
 Warning:
 Only use this function if you really, really, really know what you
 are doing.
     
        - name
            string
         The name of the signal
        
- func
            function
         The callback to call when the signal is emitted