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
Object properties
| data_list | The pie chart data list. | 
| data | The pie chart data. | 
| border_color | The border color. | 
| border_width | The pie elements border width. | 
| colors | The pie chart colors. | 
| display_labels | If the pie chart has labels. | 
| forced_height | Force a widget height. | 
| forced_width | Force a widget width. | 
| opacity | The widget opacity (transparency). | 
| visible | The widget visibility. | 
Signals
| widget::layout_changed | When the layout (size) change. | 
| widget::redraw_needed | When the widget content changed. | 
| button::press | When a mouse button is pressed over the widget. | 
| button::release | When a mouse button is released over the widget. | 
| mouse::enter | When the mouse enter a widget. | 
| mouse::leave | When the mouse leave a widget. | 
Theme variables
| beautiful.piechart_border_color | The border color. | 
| beautiful.piechart_border_width | The pie elements border width. | 
| beautiful.piechart_colors | The pie chart colors. | 
Methods
| wibox.widget.piechart:get_all_children () | Get all direct and indirect children widgets. | 
| wibox.widget.piechart:setup (args) | Set a declarative widget hierarchy description. | 
| wibox.widget.piechart:buttons (_buttons) | Set/get a widget's buttons. | 
| wibox.widget.piechart:emit_signal_recursive (signal_name, ...) | Emit a signal and ensure all parent widgets in the hierarchies also forward the signal. | 
| wibox.widget.piechart:emit_signal (name, ...) | Emit a signal. | 
| wibox.widget.piechart:connect_signal (name, func) | Connect to a signal. | 
| wibox.widget.piechart:weak_connect_signal (name, func) | Connect to a signal weakly. | 
Object properties
- 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.
 
- data
- 
    The pie chart data.
    Type:- data table Labels as keys and number as value.
 
- border_color
- 
    The border color.
 If none is set, it will use current foreground (text) color.
Type:- color
 See also:
- border_width
- 
    The pie elements border width. 
Type:- border_width number (default 1)
 
- 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:
- display_labels
- 
    If the pie chart has labels. 
Type:- boolean (default true)
 
- forced_height
- 
    Force a widget height.
    Type:- height
            number or nil
         The height (nilfor automatic)
 
- height
            number or nil
         The height (
- forced_width
- 
    Force a widget width.
    Type:- width
            number or nil
         The width (nilfor automatic)
 
- width
            number or nil
         The width (
- opacity
- 
    The widget opacity (transparency).
    Type:- opacity number The opacity (between 0 and 1) (default 1)
 
- visible
- 
    The widget visibility.
    Type:- boolean
 
Signals
- 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:
- find_widgets_result The entry from the result of
 wibox.drawable:find_widgets for the position that the mouse hit.
        
- 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:
- find_widgets_result The entry from the result of
 wibox.drawable:find_widgets for the position that the mouse hit.
        
Theme variables
- beautiful.piechart_border_color
- 
    The border color.
 If none is set, it will use current foreground (text) color.
    Type:- color
 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:
Methods
- 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: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.