# Class `wibox.layout.align`

### Usage:

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

### Info:

- Copyright: 2010 Uli Schlachter
- Author: Uli Schlachter

## Object properties

wibox.layout.align.first | Set the layout's first widget.
wibox.layout.align.second | Set the layout's second widget.
wibox.layout.align.third | Set the layout's third widget.
wibox.layout.align.children | All direct children of this layout.
wibox.layout.align.expand | Set the expand mode which determines how sub widgets expand to take up unused space.
wibox.layout.align.forced_height | Force a widget height.
wibox.layout.align.forced_width | Force a widget width.
wibox.layout.align.opacity | The widget opacity (transparency).
wibox.layout.align.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.align:horizontal ([left[, middle[, right]]]) | Returns a new horizontal align layout.
wibox.layout.align:vertical ([top[, middle[, bottom]]]) | Returns a new vertical align layout.
wibox.layout.align:index (widget[, recursive[, ...]]) | Get a widex index.
wibox.layout.align:get_all_children () | Get all direct and indirect children widgets.
wibox.layout.align:setup (args) | Set a declarative widget hierarchy description.
wibox.layout.align:buttons (_buttons) | Set/get a widget's buttons.
wibox.layout.align:emit_signal_recursive (signal_name, ...) | Emit a signal and ensure all parent widgets in the hierarchies also forward the signal.
wibox.layout.align:disconnect_signal (name, func) | Disconnect to a signal.
wibox.layout.align:emit_signal (name, ...) | Emit a signal.
wibox.layout.align:connect_signal (name, func) | Connect to a signal.
wibox.layout.align:weak_connect_signal (name, func) | Connect to a signal weakly.

## Object properties

wibox.layout.align.first
  Set the layout's first widget. This is the widget that is at the left/top
wibox.layout.align.second
  Set the layout's second widget. This is the centered one.
wibox.layout.align.third
  Set the layout's third widget. This is the widget that is at the right/bottom
wibox.layout.align.children
  All direct children of this layout. This can be used to replace all 3 widgets at once.
wibox.layout.align.expand
  Set the expand mode which determines how sub widgets expand to take up unused space.

  ### Type:

  - mode string

    How to use unused space.

    - "inside" - Default option. Size of outside widgets is determined using their fit function. Second, middle, or center widget expands to fill remaining space.
    - "outside" - Center widget is sized using its fit function and placed in the center of the allowed space. Outside widgets expand (or contract) to fill remaining space on their side.
    - "none" - All widgets are sized using their fit function, drawn to only the returned space, or remaining space, whichever is smaller. Center widget gets priority.
    (default inside)
wibox.layout.align.forced_height
  Force a widget height.

  ### Type:

  - height number or nil The height (`nil` for automatic)
wibox.layout.align.forced_width
  Force a widget width.

  ### Type:

  - width number or nil The width (`nil` for automatic)
wibox.layout.align.opacity
  The widget opacity (transparency).

  ### Type:

  - opacity number The opacity (between 0 and 1) (default 1)
wibox.layout.align.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
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:

  widget::layout_changed
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:

  mouse
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
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
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:

  mouse

## Methods

wibox.layout.align:horizontal ([left[, middle[, right]]])
  Returns a new horizontal align layout. An align layout can display up to three widgets. The widget set via :setleft() is left-aligned. :setright() sets a widget which will be right-aligned. The remaining space between those two will be given to the widget set via :set_middle().
  - left widget Widget to be put to the left. (optional)
  - middle widget Widget to be put to the middle. (optional)
  - right widget Widget to be put to the right. (optional)
wibox.layout.align:vertical ([top[, middle[, bottom]]])
  Returns a new vertical align layout. An align layout can display up to three widgets. The widget set via :settop() is top-aligned. :setbottom() sets a widget which will be bottom-aligned. The remaining space between those two will be given to the widget set via :set_middle().
  - top widget Widget to be put to the top. (optional)
  - middle widget Widget to be put to the middle. (optional)
  - bottom widget Widget to be put to the right. (optional)
wibox.layout.align: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:

  1. The index
  2. The parent layout
  3. The path between \"self\" and \"widget\"
wibox.layout.align: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.align:setup (args)
  Set a declarative widget hierarchy description. See The declarative layout system
  - args An array containing the widgets disposition
wibox.layout.align:buttons (_buttons)
  Set/get a widget's buttons.
  - _buttons The table of buttons that should bind to the widget.
wibox.layout.align: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.align:disconnect_signal (name, func)
  Disconnect to a signal.
  - name string The name of the signal
  - func function The callback that should be disconnected
wibox.layout.align: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.align: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.align: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

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