Class wibox.layout.stack
A stacked layout.
 This layout display widgets on top of each other. It can be used to overlay
 a wibox.widget.textbox on top of a awful.widget.progressbar or manage
 "pages" where only one is visible at any given moment.
 The indices are going from 1 (the bottom of the stack) up to the top of
 the stack. The order can be changed either using :swap or :raise.
Usage:
wibox.widget {
    generic_widget( 'first'  ),
    generic_widget( 'second' ),
    generic_widget( 'third'  ),
    layout  = wibox.layout.stack
}
    
    Info:
- Copyright: 2016 Emmanuel Lepage Vallee
- Author: Emmanuel Lepage Vallee
Functions
| wibox.layout.stack () | Create a new stack layout. | 
Object properties
| children | Get all direct children of this layout. | 
| spacing | Add spacing around the widget, similar to the margin container. | 
| top_only | If only the first stack widget is drawn | 
| horizontal_offset | Add an horizontal offset to each layers. | 
| vertial_offset | Add an vertical offset to each layers. | 
| 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. | 
Methods
| wibox.layout.stack:set (index, widget2) | Set a widget at a specific index, replace the current one. | 
| wibox.layout.stack:replace_widget (widget, widget2[, recursive=false]) | Replace the first instance of widget in the layout with widget2. | 
| wibox.layout.stack:swap (index1, index2) | Swap 2 widgets in a layout. | 
| wibox.layout.stack:swap_widgets (widget1, widget2[, recursive=false]) | Swap 2 widgets in a layout. | 
| wibox.layout.stack:reset (layout) | Reset a ratio layout. | 
| wibox.layout.stack:add (layout, ...) | Add some widgets to the given stack layout | 
| wibox.layout.stack:remove (The) | Remove a widget from the layout | 
| wibox.layout.stack:insert (index, widget) | Insert a new widget in the layout at position index | 
| wibox.layout.stack:remove_widgets (widget) | Remove one or more widgets from the layout The last parameter can be a boolean, forcing a recursive seach of the widget(s) to remove. | 
| wibox.layout.stack:raise (index) | Raise a widget at indexto the top of the stack | 
| wibox.layout.stack:raise_widget (widget[, recursive=false]) | Raise the first instance of widget | 
| wibox.layout.stack:get_all_children () | Get all direct and indirect children widgets. | 
| wibox.layout.stack:setup (args) | Set a declarative widget hierarchy description. | 
| wibox.layout.stack:buttons (_buttons) | Set/get a widget's buttons. | 
| wibox.layout.stack:emit_signal_recursive (signal_name, ...) | Emit a signal and ensure all parent widgets in the hierarchies also forward the signal. | 
| wibox.layout.stack:emit_signal (name, ...) | Emit a signal. | 
| wibox.layout.stack:connect_signal (name, func) | Connect to a signal. | 
| wibox.layout.stack:weak_connect_signal (name, func) | Connect to a signal weakly. | 
Functions
Methods- wibox.layout.stack ()
- 
    Create a new stack layout.
    Returns:- 
           widget
        A new stack layout
    
 
Object properties
- children
- 
    Get all direct children of this layout.
    Type:- layout The layout you are modifying.
 
- spacing
- 
    Add spacing around the widget, similar to the margin container. 
Type:- spacing number Spacing between widgets.
 Usage:wibox.widget { generic_widget( 'first' ), generic_widget( 'second' ), generic_widget( 'third' ), spacing = 6, layout = wibox.layout.stack } 
- top_only
- If only the first stack widget is drawn
- horizontal_offset
- 
    Add an horizontal offset to each layers. 
Note that this reduces the overall size of each widgets by the sum of all layers offsets. Type:- number
 Usage:wibox.widget { generic_widget( 'first' ), generic_widget( 'second' ), generic_widget( 'third' ), horizontal_offset = 5, vertical_offset = 5, layout = wibox.layout.stack } 
- vertial_offset
- 
    Add an vertical offset to each layers. 
Note that this reduces the overall size of each widgets by the sum of all layers offsets. Type:- number
 See also:
- 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.
        
Methods
- wibox.layout.stack:set (index, widget2)
- 
    Set a widget at a specific index, replace the current one.
 Signal: widget::replaced The argument is the new widget and the old one
 and the index.
    - index number A widget or a widget index
- widget2 The widget to take the place of the first one
 Returns:- 
           boolean
        If the operation is successful
    
 
- wibox.layout.stack:replace_widget (widget, widget2[, recursive=false])
- 
    Replace the first instance of widget in the layout with widget2. Signal: widget::replaced The argument is the new widget and the old one and the index.- widget The widget to replace
- widget2 The widget to replace widget with
- recursive boolean Dig in all compatible layouts to find the widget. (default false)
 Returns:- 
           boolean
        If the operation is successful
    
 
- wibox.layout.stack:swap (index1, index2)
- 
    Swap 2 widgets in a layout.
 Signal: widget::swapped The arguments are both widgets and both (new) indexes.
    - index1 number The first widget index
- index2 number The second widget index
 Returns:- 
           boolean
        If the operation is successful
    
 
- wibox.layout.stack:swap_widgets (widget1, widget2[, recursive=false])
- 
    Swap 2 widgets in a layout.
 If widget1 is present multiple time, only the first instance is swapped
 Signal: widget::swapped The arguments are both widgets and both (new) indexes.
 if the layouts not the same, then only widget::replacedwill be emitted.- widget1 The first widget
- widget2 The second widget
- recursive boolean Dig in all compatible layouts to find the widget. (default false)
 Returns:- 
           boolean
        If the operation is successful
    
 
- wibox.layout.stack:reset (layout)
- 
    Reset a ratio layout.  This removes all widgets from the layout.
 Signal: widget::reset
    - layout The layout you are modifying.
 
- wibox.layout.stack:add (layout, ...)
- 
    Add some widgets to the given stack layout
    - layout The layout you are modifying.
- ... widget Widgets that should be added (must at least be one)
 
- wibox.layout.stack:remove (The)
- 
    Remove a widget from the layout
    - The index widget index to remove
 Returns:- 
           boolean
        index If the operation is successful
    
 
- wibox.layout.stack:insert (index, widget)
- 
    Insert a new widget in the layout at position index- index number The position
- widget The widget
 Returns:- 
           boolean
        If the operation is successful
    
 
- wibox.layout.stack:remove_widgets (widget)
- 
    Remove one or more widgets from the layout
 The last parameter can be a boolean, forcing a recursive seach of the
 widget(s) to remove.
    - widget ... Widgets that should be removed (must at least be one)
 Returns:- 
           boolean
        If the operation is successful
    
 
- wibox.layout.stack:raise (index)
- 
    Raise a widget at indexto the top of the stack- index number the widget index to raise
 
- wibox.layout.stack:raise_widget (widget[, recursive=false])
- 
    Raise the first instance of widget
    - widget The widget to raise
- recursive boolean Also look deeper in the hierarchy to find the widget (default false)
 
- wibox.layout.stack: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.layout.stack:setup (args)
- 
    Set a declarative widget hierarchy description.
 See The declarative layout system
    - args An array containing the widgets disposition
 
- wibox.layout.stack:buttons (_buttons)
- 
    Set/get a widget's buttons.
    - _buttons The table of buttons that should bind to the widget.
 
- wibox.layout.stack: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.layout.stack: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.layout.stack: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.layout.stack: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.