Module: wibox.container.constraint

Usage example

Info:

  • Copyright: 2012 Lukáš Hrázký
  • Author: Lukáš Hrázký

Constructors

wibox.container.constraint ([widget[, strategy[, width[, height]]]]) Returns a new constraint container.

Functions

wibox.container.constraint.add_button (button) Add a new awful.button to this widget.

Object properties

widget widget The widget to be constrained.
strategy string Set the strategy to use for the constraining.
height number Set the maximum width to val.
width number Set the maximum height to val.
children table Get or set the children elements.
all_children table Get all direct and indirect children widgets.
forced_height number or nil Force a widget height.
forced_width number or nil Force a widget width.
opacity number The widget opacity (transparency).
visible boolean The widget visibility.
buttons table The widget buttons.

Object methods

:reset () Reset this layout.
:setup {[args]} Set a declarative widget hierarchy description.
:emit_signal_recursive (signal_name, ...) Emit a signal and ensure all parent widgets in the hierarchies also forward the signal.
:emit_signal (name, ...) Emit a signal.
:connect_signal (name, func) Connect to a signal.
:weak_connect_signal (name, func) Connect to a signal weakly.

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.


Constructors

wibox.container.constraint ([widget[, strategy[, width[, height]]]])
Returns a new constraint container. This container will constraint the size of a widget according to the strategy. Note that this will only work for layouts that respect the widget’s size, eg. fixed layout. In layouts that don’t (fully) respect widget’s requested size, the inner widget still might get drawn with a size that does not fit the constraint, eg. in flex layout.

Parameters:

  • widget A widget to use. (optional)
  • strategy How to constraint the size. ‘max’ (default), ‘min’ or ‘exact’. (optional)
  • width The maximum width of the widget. nil for no limit. (optional)
  • height The maximum height of the widget. nil for no limit. (optional)

Returns:

    table A new constraint container

Functions

wibox.container.constraint.add_button (button)
Add a new awful.button to this widget.

Parameters:

  • button awful.button The button to add.

Object properties

widget (widget)
The widget to be constrained.

Type constraints:

strategy (string)
Set the strategy to use for the constraining. Valid values are ‘max’, ‘min’ or ‘exact’. Throws an error on invalid values.

Type constraints:

  • strategy string Either ‘max’, ‘min’ or ‘exact’
height (number)
Set the maximum width to val. nil for no width limit.
width (number)
Set the maximum height to val. nil for no height limit.
children (table)
Get or set the children elements.

Type constraints:

all_children (table)
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.

Type constraints:

forced_height (number or nil)
Force a widget height.

Type constraints:

  • height number or nil The height (nil for automatic)
forced_width (number or nil)
Force a widget width.

Type constraints:

  • width number or nil The width (nil for automatic)
opacity (number)
The widget opacity (transparency).

Type constraints:

  • opacity number The opacity (between 0 and 1) (default 1)
visible (boolean)
The widget visibility.
buttons (table)
The widget buttons.

The table contains a list of awful.button objects.

See also:

Object methods

:reset ()
Reset this layout. The widget will be unreferenced, strategy set to “max” and the constraints set to nil.
:setup {[args]}
Set a declarative widget hierarchy description. See The declarative layout system

Parameters:

  • args An array containing the widgets disposition
: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.

Parameters:

  • signal_name string
  • ... Other arguments
:emit_signal (name, ...)
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().
:connect_signal (name, func)
Connect to a signal.

Parameters:

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

Parameters:

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

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:

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:

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