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:

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 or nil	The widget in slot one.
second	widget or nil	The widget in slot two.
third	widget or nil	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) -> 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) -> 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:

Name		Type(s)	Description
left	Optional	widget	Widget to be put in slot one.
middle	Optional	widget	Widget to be put in slot two.
right	Optional	widget	Widget to be put in slot three.

🔗 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:

Name		Type(s)	Description
top	Optional	widget	Widget to be put in slot one.
middle	Optional	widget	Widget to be put in slot two.
bottom	Optional	widget	Widget to be put in slot three.

Object properties

🔗 first widget or nil · 1 signal

The widget in slot one.

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

Constraints:

Default value	: `nil`
Type description:
nil	: This spot will be empty. Depending on how large the second widget is an and the value of `expand`, it might mean it will leave an empty area.

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 or nil · 1 signal

The widget in slot two.

This is the centered one.

Constraints:

Default value	: `nil`
Type description:
nil	: When this property is `nil`, then there will be an empty area.

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 or nil · 1 signal

The widget in slot three.

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

Constraints:

Default value	: `nil`
Type description:
nil	: This spot will be empty. Depending on how large the second widget is an and the value of `expand`, it might mean it will leave an empty area.

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.

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

Constraints:

Default value	: `"inside"`
Valid values:	: How to use unused space.
`"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.

🔗 children table · Inherited from wibox.widget.base

Get or set the children elements.

Constraints:

Default value	: `{}`
Table content	: A list of wibox.widget.

Constraints:

Default value	: `{}`
Table content	: A list of wibox.widget.

Constraints:

Default value	: `nil`
Type description:
nil	: Let the layout decide the height. Usually using the widget native height.
number	: Enforce a number of pixels.
Unit	: pixel
Negative allowed	: false

Constraints:

Default value	: `nil`
Type description:
nil	: Let the layout decide the width. Usually using the widget native width.
number	: Enforce a number of pixels.
Unit	: pixel
Negative allowed	: false

Constraints:

Default value	: `1.0`
Unit	: A gradient between transparent (`0.0`) and opaque (`1.0`).
Minimum value	: 0.0
Maximum value	: 1.0

Constraints:

Default value	: `true`
Valid values	: `true` or `false`.

Constraints:

Default value	: `{}`
Table content	: A list of awful.button.

Object methods

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

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

Parameters:

Name		Type(s)	Description
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) -> boolean · 1 signal

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

Parameters:

Name		Type(s)	Description	Default value
widget		widget	The widget to replace	Not applicable
widget2		widget	The widget to replace `widget` with	Not applicable
recursive	Optional	boolean	Recurse into all compatible layouts to find the widget.	`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:

Name		Type(s)	Description
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) -> 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:

Name		Type(s)	Description	Default value
widget1		widget	The first widget	Not applicable
widget2		widget	The second widget	Not applicable
recursive	Optional	boolean	Recurse into all compatible layouts to find the widget.	`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:

Name		Type(s)	Description
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:

Name		Type(s)	Description
signal_name		string
...			Other arguments

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

Get the index of a widget.

Parameters:

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

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		Type(s)	Description
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		Type(s)	Description
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		Type(s)	Description
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		Type(s)	Description
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:

Name	Type(s)	Description
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	table	The entry from the result of wibox: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:

Name	Type(s)	Description
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	table	The entry from the result of wibox: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:

Name	Type(s)	Description
self	table	The current object instance itself.
find_widgets_result	table	The entry from the result of wibox: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:

Name	Type(s)	Description
self	table	The current object instance itself.
find_widgets_result	table	The entry from the result of wibox: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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Classes

Documentation

Module: wibox.layout.align

Usage:

Class Hierarchy

Info:

Constructors

Object properties

Object methods

Signals

Constructors

Parameters:

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Object properties

Constraints:

Emit signals:

Constraints:

Emit signals:

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Emit signals:

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Object methods

Parameters:

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Emit signals:

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Module: `wibox.layout.align`