Module: `wibox.layout.align`

The align layout has three slots for child widgets.

On its main axis, it will use as much space as is available to it and distribute that to its child widgets by stretching or shrinking them based on the chosen expand strategy. On its secondary axis, the biggest child widget determines the size of the layout, but smaller widgets will not be stretched to match it.

In its default configuration, the layout will give the first and third widgets only the minimum space they ask for and it aligns them to the outer edges. The remaining space between them is made available to the widget in slot two.

This layout is most commonly used to split content into left/top, center and right/bottom sections. As such, it is usually seen as the root layout in awful.wibar.

You may also fill just one or two of the widget slots, the expand algorithm will adjust accordingly.

Usage example

Usage:

wibox.widget {
    generic_widget( "first"  ),
    generic_widget( "second" ),
    generic_widget( "third"  ),
    layout  = wibox.layout.align.horizontal
}

Class Hierarchy

gears.object
- wibox.widget.base
- - wibox.layout.align

Info:

Copyright: 2010 Uli Schlachter
Originally authored by: Uli Schlachter
(Full contributors list available on our github project)

Constructors

wibox.layout.align.horizontal ([left[, middle[, right]]])	Returns a new horizontal align layout.
wibox.layout.align.vertical ([top[, middle[, bottom]]])	Returns a new vertical align layout.

Object properties

first	widget	The widget in slot one.
second	widget	The widget in slot two.
third	widget	The widget in slot three.
expand	string	Set the expand mode, which determines how child widgets expand to take up unused space.
children	table	Get or set the children elements.	Inherited from wibox.widget.base
all_children	table	Get all direct and indirect children widgets.	Inherited from wibox.widget.base
forced_height	number or nil	Force a widget height.	Inherited from wibox.widget.base
forced_width	number or nil	Force a widget width.	Inherited from wibox.widget.base
opacity	number	The widget opacity (transparency).	Inherited from wibox.widget.base
visible	boolean	The widget visibility.	Inherited from wibox.widget.base
buttons	table	The widget buttons.	Inherited from wibox.widget.base

Object methods

:set (index, widget2) -> boolean	Set a widget at a specific index, replacing the current one.
:replace_widget (widget, widget2[, recursive=false]) -> boolean	Replace the first instance of `widget` in the layout with `widget2`.
:swap (index1, index2) -> boolean	Swap 2 widgets in a layout.
:swap_widgets (widget1, widget2[, recursive=false]) -> boolean	Swap 2 widgets in a layout.
:reset ()	Reset the layout.
:add_button (button)	Add a new awful.button to this widget.	Inherited from wibox.widget.base
:emit_signal_recursive (signal_name, ...)	Emit a signal and ensure all parent widgets in the hierarchies also forward the signal.	Inherited from wibox.widget.base
:index (widget[, recursive[, ...]]) -> (number, widget, table)	Get the index of a widget.	Inherited from wibox.widget.base
:connect_signal (name, func)	Connect to a signal.	Inherited from gears.object
:weak_connect_signal (name, func)	Connect to a signal weakly.	Inherited from gears.object
:disconnect_signal (name, func)	Disonnect from a signal.	Inherited from gears.object
:emit_signal (name, ...)	Emit a signal.	Inherited from gears.object

Signals

widget::layout_changed	When the layout (size) change.	Inherited from wibox.widget.base
widget::redraw_needed	When the widget content changed.	Inherited from wibox.widget.base
button::press	When a mouse button is pressed over the widget.	Inherited from wibox.widget.base
button::release	When a mouse button is released over the widget.	Inherited from wibox.widget.base
mouse::enter	When the mouse enter a widget.	Inherited from wibox.widget.base
mouse::leave	When the mouse leave a widget.	Inherited from wibox.widget.base

Constructors

wibox.layout.align.horizontal ([left[, middle[, right]]])

Returns a new horizontal align layout.

The three widget slots are aligned left, center and right.

Additionally, this creates the aliases set_left, set_middle and set_right to assign first, second and third respectively.

Parameters:

left widget Widget to be put in slot one. (optional)
middle widget Widget to be put in slot two. (optional)
right widget Widget to be put in slot three. (optional)

wibox.layout.align.vertical ([top[, middle[, bottom]]])

Returns a new vertical align layout.

The three widget slots are aligned top, center and bottom.

Additionally, this creates the aliases set_top, set_middle and set_bottom to assign first, second and third respectively.

Parameters:

top widget Widget to be put in slot one. (optional)
middle widget Widget to be put in slot two. (optional)
bottom widget Widget to be put in slot three. (optional)

Object properties

first widget · 1 signal

The widget in slot one.

This is the widget that is at the left/top.

Click to display more

Emit signals:

property::first When the first value changes.

self wibox.layout.align The object which changed (useful when connecting many object to the same callback).
new_value first The new value affected to the property.

second widget · 1 signal

The widget in slot two.

This is the centered one.

Click to display more

Emit signals:

property::second When the second value changes.

self wibox.layout.align The object which changed (useful when connecting many object to the same callback).
new_value second The new value affected to the property.

third widget · 1 signal

The widget in slot three.

This is the widget that is at the right/bottom.

Click to display more

Emit signals:

property::third When the third value changes.

self wibox.layout.align The object which changed (useful when connecting many object to the same callback).
new_value third The new value affected to the property.

expand string

Set the expand mode, which determines how child widgets expand to take up unused space.

The following values are valid:

"inside": The widgets in slot one and three are set to their minimal required size. The widget in slot two is then given the remaining space. This is the default behaviour.
"outside": The widget in slot two is set to its minimal required size and placed in the center of the space available to the layout. The other widgets are then given the remaining space on either side. If the center widget requires all available space, the outer widgets are not drawn at all.
"none": All widgets are given their minimal required size or the remaining space, whichever is smaller. The center widget gets priority.

Attempting to set any other value than one of those three will fall back to "inside".

Type constraints:

mode string How to use unused space. (default "inside")

children table · Inherited from wibox.widget.base

Get or set the children elements.

Type constraints:

children table The children.

all_children table · Inherited from wibox.widget.base

Get all direct and indirect children widgets. This will scan all containers recursively to find widgets Warning: This method it prone to stack overflow if there is a loop in the widgets hierarchy. A hierarchy loop is when a widget, or any of its children, contain (directly or indirectly) itself.

Type constraints:

children table The children.

forced_height number or nil · Inherited from wibox.widget.base

Force a widget height.

Type constraints:

height number or nil The height (nil for automatic)

forced_width number or nil · Inherited from wibox.widget.base

Force a widget width.

Type constraints:

width number or nil The width (nil for automatic)

opacity number · Inherited from wibox.widget.base

The widget opacity (transparency).

Type constraints:

opacity number The opacity (between 0 and 1) (default 1)

visible boolean · Inherited from wibox.widget.base

The widget visibility.

buttons table · Inherited from wibox.widget.base

The widget buttons.

The table contains a list of awful.button objects.

Object methods

:set (index, widget2) -> boolean · 1 signal

Set a widget at a specific index, replacing the current one.

Parameters:

index number A widget or a widget index
widget2 widget The widget to replace the previous one with

Returns:

boolean

true

false

Click to display more

Emit signals:

widget::replaced

self widget The layout.
widget widget The inserted widget.
previous widget The previous widget.
index number The replaced index.

:replace_widget (widget, widget2[, recursive=false]) -> boolean · 1 signal

Replace the first instance of widget in the layout with widget2.

Parameters:

widget widget The widget to replace
widget2 widget The widget to replace widget with
recursive boolean Recurse into all compatible layouts to find the widget. (default false)

Returns:

boolean

true

false

Click to display more

Emit signals:

widget::replaced

self widget The layout.
widget widget index The inserted widget.
previous widget The previous widget.
index number The replaced index.

:swap (index1, index2) -> boolean · 1 signal

Swap 2 widgets in a layout.

Parameters:

index1 number The first widget index
index2 number The second widget index

Returns:

boolean

true

false

Click to display more

Emit signals:

widget::swapped

self widget The layout.
widget1 widget The first widget.
widget2 widget The second widget.
index1 number The first index.
index1 number The second index.

:swap_widgets (widget1, widget2[, recursive=false]) -> boolean · 1 signal

Swap 2 widgets in a layout.

If widget1 is present multiple time, only the first instance is swapped.

Calls set internally, so the signal widget::replaced is emitted for both widgets as well.

Parameters:

widget1 widget The first widget
widget2 widget The second widget
recursive boolean Recurse into all compatible layouts to find the widget. (default false)

Returns:

boolean

true

false

Emit signals:

widget::swapped

self widget The layout.
widget1 widget The first widget.
widget2 widget The second widget.
index1 number The first index.
index1 number The second index.

:reset () · 1 signal

Reset the layout. This removes all widgets from the layout.
Click to display more

Emit signals:

widget::reset

self widget The layout.

:add_button (button) · Inherited from wibox.widget.base

Add a new awful.button to this widget.

Parameters:

button awful.button The button to add.

:emit_signal_recursive (signal_name, ...) · Inherited from wibox.widget.base

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.

Note that this function has some flaws:

The signal is only forwarded once the widget tree has been built. This happens after all currently scheduled functions have been executed. Therefore, it will not start to work right away.
In case the widget is present multiple times in a single widget tree, this function will also forward the signal multiple times (once per upward tree path).
If the widget is removed from the widget tree, the signal is still forwarded for some time, similar to the first case.

Parameters:

signal_name string
... Other arguments

:index (widget[, recursive[, ...]]) -> (number, widget, table) · Inherited from wibox.widget.base

Get the index of a widget.

Parameters:

widget widget The widget to look for.
recursive boolean Recursively check accross the sub-widgets hierarchy. (optional)
... widget Additional widgets to add at the end of the sub-widgets hierarchy "path". (optional)

Returns:

number The widget index.
widget The parent widget.
table The hierarchy path between "self" and "widget".

:connect_signal (name, func) · Inherited from gears.object

Connect to a signal.

Usage example output:

In slot [obj]   nil nil nil
In slot [obj]   foo bar 42

Parameters:

name string The name of the signal.
func function The callback to call when the signal is emitted.

Usage:

local o = gears.object{}
-- Function can be attached to signals
local function slot(obj, a, b, c)
    print("In slot", obj, a, b, c)
end
o:connect_signal("my_signal", slot)
-- Emitting can be done without arguments. In that case, the object will be
-- implicitly added as an argument.
o:emit_signal "my_signal"
-- It is also possible to add as many random arguments are required.
o:emit_signal("my_signal", "foo", "bar", 42)
-- Finally, to allow the object to be garbage collected (the memory freed), it
-- is necessary to disconnect the signal or use weak_connect_signal
o:disconnect_signal("my_signal", slot)
-- This time, the slot wont be called as it is no longer connected.
o:emit_signal "my_signal"

:weak_connect_signal (name, func) · Inherited from gears.object

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.

Parameters:

name string The name of the signal.
func function The callback to call when the signal is emitted.

:disconnect_signal (name, func) · Inherited from gears.object

Disonnect from a signal.

Parameters:

name string The name of the signal.
func function The callback that should be disconnected.

:emit_signal (name, ...) · Inherited from gears.object

Emit a signal.

Parameters:

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()

Signals

widget::layout_changed · Inherited from wibox.widget.base

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.

Arguments:

self table The current object instance itself.
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.

Arguments:

self table The current object instance itself.
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.

Arguments:

self table The current object instance itself.
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.

Arguments:

self table The current object instance itself.
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.

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Documentation

Module: wibox.layout.align

Usage:

Class Hierarchy

Info:

Constructors

Object properties

Object methods

Signals

Constructors

Parameters:

Parameters:

Object properties

Emit signals:

Emit signals:

Emit signals:

Type constraints:

Type constraints:

Type constraints:

Type constraints:

Type constraints:

Type constraints:

See also:

Object methods

Parameters:

Returns:

Emit signals:

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Returns:

Emit signals:

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Returns:

Emit signals:

Parameters:

Returns:

See also:

Emit signals:

Emit signals:

Parameters:

Parameters:

Parameters:

Returns:

Parameters:

Usage:

Parameters:

Parameters:

Parameters:

Signals

See also:

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See also:

Module: `wibox.layout.align`