Module: wibox.widget.base

Class Hierarchy

Info:

  • Copyright: 2010 Uli Schlachter
  • Author: Uli Schlachter

Constructors

wibox.widget.base.make_widget_declarative {[args]} Create a widget from a declarative description.
wibox.widget.base.make_widget_from_value (wdg[, ...=nil]) Create a widget from an undetermined value.
wibox.widget.base.make_widget ([proxy[, widget_name[, args={}]]]) Create an empty widget skeleton.
wibox.widget.base.empty_widget () Generate an empty widget which takes no space and displays nothing.

Static module functions

wibox.widget.base.rect_to_device_geometry () Figure out the geometry in the device coordinate space.
wibox.widget.base.fit_widget (parent, context, widget, width, height) -> (number, number) Fit a widget for the given available width and height.
wibox.widget.base.layout_widget (parent, context, widget, width, height) -> table Lay out a widget for the given available width and height.
wibox.widget.base.handle_button () Handle a button event on a widget.
wibox.widget.base.place_widget_via_matrix (widget, mat, width, height) -> table Create widget placement information.
wibox.widget.base.place_widget_at (widget, x, y, width, height) -> table Create widget placement information.
wibox.widget.base.check_widget () Do some sanity checking on a widget.

Object properties

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

:add_button (button) Add a new awful.button to this widget.
:emit_signal_recursive (signal_name, ...) Emit a signal and ensure all parent widgets in the hierarchies also forward the signal.
:index (widget[, recursive[, ...]]) -> (number, widget, table) Get the index of a widget.
: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.
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

:set_widget_common (self, widget) Common implementation of the :set_widget() method exposed by many other widgets.


Constructors

wibox.widget.base.make_widget_declarative {[args]}
Create a widget from a declarative description.

See The declarative layout system.

Parameters:

  • args table A table containing the widgets disposition.
wibox.widget.base.make_widget_from_value (wdg[, ...=nil])

Create a widget from an undetermined value.

The value can be:

  • A widget (in which case nothing new is created)
  • A declarative construct
  • A constructor function
  • A metaobject

Parameters:

  • wdg The value.
  • ... Arguments passed to the contructor (if any). (default nil)

Returns:

    widget or nil The new widget or nil in case of failure.
wibox.widget.base.make_widget ([proxy[, widget_name[, args={}]]])
Create an empty widget skeleton.

See Creating new widgets.

Parameters:

  • proxy widget If this is set, the returned widget will be a proxy for this widget. It will be equivalent to this widget. This means it looks the same on the screen. (optional)
  • widget_name string Name of the widget. If not set, it will be set automatically via gears.object.modulename. (optional)
  • args Widget settings
    • enable_properties boolean Enable automatic getter and setter methods. (default false)
    • class table The widget class (default nil)

See also:

wibox.widget.base.empty_widget ()
Generate an empty widget which takes no space and displays nothing.

Static module functions

wibox.widget.base.rect_to_device_geometry ()
Figure out the geometry in the device coordinate space.

This gives only tight bounds if no rotations by non-multiples of 90° are used.

wibox.widget.base.fit_widget (parent, context, widget, width, height) -> (number, number)
Fit a widget for the given available width and height.

This calls the widget's :fit callback and caches the result for later use. Never call :fit directly, but always through this function!

Parameters:

  • parent widget The parent widget which requests this information.
  • context table The context in which we are fit.
  • widget widget The widget to fit (this uses widget:fit(context, width, height)).
  • width number The available width for the widget.
  • height number The available height for the widget.

Returns:

  1. number The width that the widget wants to use.
  2. number The height that the widget wants to use.
wibox.widget.base.layout_widget (parent, context, widget, width, height) -> table
Lay out a widget for the given available width and height.

This calls the widget's :layout callback and caches the result for later use. Never call :layout directly, but always through this function! However, normally there shouldn't be any reason why you need to use this function.

Parameters:

  • parent widget The parent widget which requests this information.
  • context table The context in which we are laid out.
  • widget widget The widget to layout (this uses widget:layout(context, width, height)).
  • width number The available width for the widget.
  • height number The available height for the widget.

Returns:

    table The result from the widget's :layout callback.
wibox.widget.base.handle_button ()
Handle a button event on a widget.

This is used internally and should not be called directly.

wibox.widget.base.place_widget_via_matrix (widget, mat, width, height) -> table
Create widget placement information. This should be used in a widget's :layout() callback.

Parameters:

  • widget widget The widget that should be placed.
  • mat A matrix transforming from the parent widget's coordinate system. For example, use matrix.create_translate(1, 2) to draw a widget at position (1, 2) relative to the parent widget.
  • width number The width of the widget in its own coordinate system. That is, after applying the transformation matrix.
  • height number The height of the widget in its own coordinate system. That is, after applying the transformation matrix.

Returns:

    table An opaque object that can be returned from :layout().
wibox.widget.base.place_widget_at (widget, x, y, width, height) -> table
Create widget placement information. This should be used for a widget's :layout() callback.

Parameters:

  • widget widget The widget that should be placed.
  • x number The x coordinate for the widget.
  • y number The y coordinate for the widget.
  • width number The width of the widget in its own coordinate system. That is, after applying the transformation matrix.
  • height number The height of the widget in its own coordinate system. That is, after applying the transformation matrix.

Returns:

    table An opaque object that can be returned from :layout().
wibox.widget.base.check_widget ()
Do some sanity checking on a widget.

This function raises an error if the widget is not valid.

Object properties

children table
Get or set the children elements.

Type constraints:

  • children table The children.
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 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
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

:add_button (button)
Add a new awful.button to this widget.

Parameters:

  • button awful.button The button to add.
: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.

Note that this function has some flaws:

  1. 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.
  2. 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).
  3. 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)
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:

  1. number The widget index.
  2. widget The parent widget.
  3. 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
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:

  • 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.

See also:

button::release
When a mouse button is released over the widget.

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.

See also:

mouse::enter
When the mouse enter a widget.

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.

See also:

mouse::leave
When the mouse leave a widget.

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.

See also:

Methods

:set_widget_common (self, widget)
Common implementation of the :set_widget() method exposed by many other widgets.

Use this if your widget has no custom logic when setting the widget.

Parameters:

  • self
  • widget

Usage:

    rawset(my_custom_widget, "set_widget", wibox.widget.base.set_widget_common)
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