Module: `naughty.widget.icon`

A notification square icon widget.

This widget is a specialized wibox.widget.imagebox with the following extra features:

Honor the beautiful notification variables.
Restrict the size avoid huge notifications
Provides some strategies to handle small icons
React to the naughty.notification object icon changes.

Usage:

local notif = naughty.notification {
    title   = "A notification",
    message = "This notification has actions!",
    icon    = beautiful.awesome_icon,
}

wibox.widget {
    notification = notif,
    widget       = naughty.widget.icon,
}

Class Hierarchy

gears.object
- wibox.widget.base
- - wibox.widget.imagebox
  - - naughty.widget.icon

Info:

Copyright: 2017 Emmanuel Lepage Vallee
Originally authored by: Emmanuel Lepage Vallee <[email protected]>
(Full contributors list available on our github project)

Constructors

naughty.widget.icon {[args]}

Create a new naughty.widget.icon.

Object properties

notification	naughty.notification	The attached notification.
resize_strategy	string	How small icons are handled.
image	image or nil	The image rendered by the `imagebox`.	Inherited from wibox.widget.imagebox
source_width	number	Return the source image width.	Inherited from wibox.widget.imagebox
source_height	number	Return the source image height.	Inherited from wibox.widget.imagebox
clip_shape	shape	Set a clip shape for this imagebox.	Inherited from wibox.widget.imagebox
resize	boolean	Should the image be resized to fit into the available space?	Inherited from wibox.widget.imagebox
upscale	boolean	Allow the image to be upscaled (made bigger).	Inherited from wibox.widget.imagebox
downscale	boolean	Allow the image to be downscaled (made smaller).	Inherited from wibox.widget.imagebox
stylesheet	string	Set the SVG CSS stylesheet.	Inherited from wibox.widget.imagebox
dpi	number or table	Set the SVG DPI (dot per inch).	Inherited from wibox.widget.imagebox
auto_dpi	boolean	Use the object DPI when rendering the SVG.	Inherited from wibox.widget.imagebox
horizontal_fit_policy	string	Set the horizontal fit policy.	Inherited from wibox.widget.imagebox
vertical_fit_policy	string	Set the vertical fit policy.	Inherited from wibox.widget.imagebox
valign	string	The vertical alignment.	Inherited from wibox.widget.imagebox
halign	string	The horizontal alignment.	Inherited from wibox.widget.imagebox
max_scaling_factor	number	The maximum scaling factor.	Inherited from wibox.widget.imagebox
scaling_quality	string	Set the scaling aligorithm.	Inherited from wibox.widget.imagebox
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

:emit_signal (name, ...)	Emit a signal.	Inherited from gears.object
: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
: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
:disconnect_signal (name, func)	Disconnect from a signal.	Inherited from gears.object

Theme variables

beautiful.notification_icon_resize_strategy	number	The default way to resize the icon.
beautiful.notification_icon_size	number	The default notification icon size.

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

🔗 naughty.widget.icon {[args]}

Create a new naughty.widget.icon.

Parameters:

Note: This constructors uses named parameters calling convention. It means you call it with {} and omit the parantheses. For example, calling this will all default argument would be naughty.widget.icon{}. This is a Lua shortcut syntax equivalent to naughty.widget.icon({}). args is only a placeholder name for the "lone table argument" used in named parameters calls.

Name		Type(s)	Description
args		table
notification		naughty.notification	The notification.

Object properties

🔗 notification naughty.notification · 1 signal

The attached notification.

Constraints:

Default value

: This is usually set in the construtor.

Click to display more

Emit signals:

property::notification When the notification value changes.

self naughty.widget.icon The object which changed (useful when connecting many object to the same callback).
new_value notification The new value affected to the property.

🔗 resize_strategy string · 1 signal · 2 theme variables

How small icons are handled.

Note that the size upper bound is defined by beautiful.notification_icon_size.

Constraints:

Default value	: `beautiful.notification_icon_resize_strategy`
Valid values:
`"scale"`	: Scale the icon up to the optimal size.
`"center"`	: Keep the icon size and draw it in the center
`"resize"`	: Change the size of the widget itself (default).

Click to display more

Emit signals:

property::resize_strategy When the resize_strategy value changes.

self naughty.widget.icon The object which changed (useful when connecting many object to the same callback).
new_value resize_strategy The new value affected to the property.

Consumed theme variables:

Theme variable	Usage
beautiful.notification_icon_resize_strategy	The fallback when there is no specified strategy.
beautiful.notification_icon_size	The size upper bound.

🔗 image image or nil · Inherited from wibox.widget.imagebox · 1 signal

The image rendered by the imagebox.

Constraints:

Default value	: `nil`
Type description:
string	: Interpreted as a path to an image file.
string	: A valid SVG content.
cairo	: A cairo image surface: Directly used as-is.
librsvg	: A librsvg handle object: Directly used as-is.
nil	: Unset the image.

Click to display more

Emit signals:

property::image When the image value changes.

self wibox.widget.imagebox The object which changed (useful when connecting many object to the same callback).

🔗 source_width number · Inherited from wibox.widget.imagebox

Return the source image width.

For SVG images, this may be affected by the DPI and might not reflect the size the images will be rendered at. For PNG or JPG images, this will return the file resolution.

Constraints:

Default value	: This depends on the source image.
Negative allowed	: false

Constraints:

Default value	: This depends on the source image.
Negative allowed	: false

Constraints:

Default value	: `gears.shape.rectangle`
Type description:
gears.shape	: Like gears.shape.circle
function:	: This can be used for custom shapes or to set parameters of existing shapes.
Function prototype:
Parameters:
cr (cairo.context)	: A Cairo context
width (number)	: The area width.
height (number)	: The area height.
Return	: The function returns nothing.
Valid values	: A gears.shape compatible shape function.

Usage:

for _, resize in ipairs {true, false} do
    for idx, shape in ipairs {gears.shape.circle, gears.shape.squircle, gears.shape.rounded_rect} do
        local w = wibox.widget {
            {
                {
                    image         = beautiful.awesome_icon,
                    forced_height = 32,
                    forced_width  = 32,
                    clip_shape    = shape,
                    resize        = resize,
                    widget        = wibox.widget.imagebox
                },
                widget = wibox.container.place
            },
            widget = wibox.container.background
        }
    end
end

Click to display more

Emit signals:

property::clip_shape When the clip_shape value changes.

self wibox.widget.imagebox The object which changed (useful when connecting many object to the same callback).
new_value clip_shape The new value affected to the property.

🔗 resize boolean · Inherited from wibox.widget.imagebox · 1 signal

Should the image be resized to fit into the available space?

Note that upscale and downscale can affect the value of resize. If conflicting values are passed to the constructor, then the result is undefined.

Constraints:

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

Click to display more

Emit signals:

property::resize When the resize value changes.

self wibox.widget.imagebox The object which changed (useful when connecting many object to the same callback).
new_value resize The new value affected to the property.

🔗 upscale boolean · Inherited from wibox.widget.imagebox

Allow the image to be upscaled (made bigger).

Note that upscale and downscale can affect the value of resize. If conflicting values are passed to the constructor, then the result is undefined.

Constraints:

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

Constraints:

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

Constraints:

Default value : ""

Usage:

local image = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>'..
    '<svg width="190" height="60">'..
        '<rect x="10"  y="10" width="50" height="50" />'..
        '<rect x="70"  y="10" width="50" height="50" class="my_class" />'..
        '<rect x="130" y="10" width="50" height="50" id="my_id" />'..
    '</svg>'

local stylesheet = "" ..
     "rect { fill: #ffff00; } "..
     ".my_class { fill: #00ff00; } "..
     "#my_id { fill: #0000ff; }"

local w = wibox.widget {
    stylesheet = stylesheet,
    image      = image,
    widget     = wibox.widget.imagebox
}

Click to display more

Emit signals:

property::stylesheet When the stylesheet value changes.

self wibox.widget.imagebox The object which changed (useful when connecting many object to the same callback).
new_value stylesheet The new value affected to the property.

🔗 dpi number or table · Inherited from wibox.widget.imagebox · 1 signal

Set the SVG DPI (dot per inch).

Force a specific DPI when rendering the .svg. For other file formats, this does nothing.

It can either be a number of a table containing the x and y keys.

Please note that DPI and resize can "fight" each other and end up making the image smaller instead of bigger.

Constraints:

Default value	: `96`
Negative allowed	: false

Usage:

local image = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>'..
    '<svg width="2in" height="1in">'..
        '<rect height="0.1in" width="0.1in" style="fill:red;" />'..
        '<text x="10" y="32" width="150" style="font-size: 0.1in;">Hello world!</text>'..
    '</svg>'

 for _, dpi in ipairs {100, 200, 300} do
     local w = wibox.widget {
        image         = image,
        dpi           = dpi,
        resize        = false,
        forced_height = 70,
        forced_width  = 150,
        widget        = wibox.widget.imagebox
    }
 end

Click to display more

Emit signals:

property::dpi When the dpi value changes.

self wibox.widget.imagebox The object which changed (useful when connecting many object to the same callback).
new_value dpi The new value affected to the property.

🔗 auto_dpi boolean · Inherited from wibox.widget.imagebox · 1 signal

Use the object DPI when rendering the SVG.

By default, the SVG are interpreted as-is. When this property is set, the screen DPI will be passed to the SVG renderer. Depending on which tool was used to create the .svg, this may do nothing at all. However, for example, if the .svg uses <text> elements and doesn't have an hardcoded stylesheet, the result will differ.

Constraints:

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

Emit signals:

property::auto_dpi When the auto_dpi value changes.

self wibox.widget.imagebox The object which changed (useful when connecting many object to the same callback).
new_value auto_dpi The new value affected to the property.

🔗 horizontal_fit_policy string · Inherited from wibox.widget.imagebox · 1 signal

Set the horizontal fit policy.

Note that repeat, reflect and pad cannot be mixed across the vertical and horizontal axis.

Here is the result for a 22x32 image:

Constraints:

Default value	: `"auto"`
Valid values:
`"auto"`	: Honor the `resize` variable and preserve the aspect ratio.
`"none"`	: Do not resize at all.
`"fit"`	: Resize to the widget width.
`"repeat"`	: Repeat the image side by side.
`"reflect"`	: Like `repeat`, but alternate the reflection.
`"pad"`	: Take the last column of pixels and repeat them.

Emit signals:

property::horizontal_fit_policy When the horizontal_fit_policy value changes.

self wibox.widget.imagebox The object which changed (useful when connecting many object to the same callback).
new_value horizontal_fit_policy The new value affected to the property.

🔗 vertical_fit_policy string · Inherited from wibox.widget.imagebox · 1 signal

Set the vertical fit policy.

Valid values are:

Note that repeat, reflect and pad cannot be mixed across the vertical and horizontal axis.

Here is the result for a 32x22 image:

Constraints:

Default value	: `"auto"`
Valid values:
`"auto"`	: Honor the `resize` variable and preserve the aspect ratio.
`"none"`	: Do not resize at all.
`"fit"`	: Resize to the widget height.
`"fit"`	: Resize to the widget width.
`"repeat"`	: Repeat the image side by side.
`"reflect"`	: Like `repeat`, but alternate the reflection.
`"pad"`	: Take the last column of pixels and repeat them.

Emit signals:

property::vertical_fit_policy When the vertical_fit_policy value changes.

self wibox.widget.imagebox The object which changed (useful when connecting many object to the same callback).
new_value vertical_fit_policy The new value affected to the property.

🔗 valign string · Inherited from wibox.widget.imagebox · 1 signal

The vertical alignment.

Constraints:

Default value	: `"center"`
Valid values:
`"top"`
`"center"`
`"bottom"`

Usage:

for _, resize in ipairs {true, false} do
    for _, valign in ipairs {"top", "center", "bottom"} do
        local w = wibox.widget {
            {
                {
                    image         = beautiful.awesome_icon,
                    forced_height = 32,
                    forced_width  = 32,
                    valign        = valign,
                    resize        = resize,
                    widget        = wibox.widget.imagebox
                },
                bg     = beautiful.bg_normal,
                widget = wibox.container.background
            },
            widget = wibox.container.place
        }
    end
end

Click to display more

Emit signals:

property::valign When the valign value changes.

self wibox.widget.imagebox The object which changed (useful when connecting many object to the same callback).
new_value valign The new value affected to the property.

🔗 halign string · Inherited from wibox.widget.imagebox · 1 signal

The horizontal alignment.

Constraints:

Default value	: `"center"`
Valid values:
`"left"`
`"center"`
`"right"`

Usage:

for _, resize in ipairs {true, false} do
    for _, halign in ipairs {"left", "center", "right"} do
        local w = wibox.widget {
            {
                {
                    image         = beautiful.awesome_icon,
                    forced_height = 32,
                    forced_width  = 32,
                    halign        = halign,
                    resize        = resize,
                    widget        = wibox.widget.imagebox
                },
                bg     = beautiful.bg_normal,
                widget = wibox.container.background
            },
            widget = wibox.container.place
        }
    end
end

Click to display more

Emit signals:

property::halign When the halign value changes.

self wibox.widget.imagebox The object which changed (useful when connecting many object to the same callback).
new_value halign The new value affected to the property.

🔗 max_scaling_factor number · Inherited from wibox.widget.imagebox · 1 signal

The maximum scaling factor.

If an image is scaled too much, it gets very blurry. This property allows to limit the scaling. Use the properties valign and halign to control how the image will be aligned.

In the example below, the original size is 22x22

Constraints:

Default value	: `0`
Negative allowed	: false
Valid values	: Use `0` for "no limit".

Emit signals:

property::max_scaling_factor When the max_scaling_factor value changes.

self wibox.widget.imagebox The object which changed (useful when connecting many object to the same callback).
new_value max_scaling_factor The new value affected to the property.

🔗 scaling_quality string · Inherited from wibox.widget.imagebox · 1 signal

Set the scaling aligorithm.

Depending on how the image is used, what is the "correct" way to scale can change. For example, upscaling a pixel art image should not make it blurry. However, scaling up a photo should not make it blocky.

Value	Description
fast	A high-performance filter
good	A reasonable-performance filter
best	The highest-quality available
nearest	Nearest-neighbor filtering (blocky)
bilinear	Linear interpolation in two dimensions

The image used in the example below has a resolution of 32x22 and is intentionally blocky to highlight the difference. It is zoomed by a factor of 3.

Constraints:

Default value	: `"good"`
Valid values:
`"fast"`	: A high-performance filter.
`"good"`	: A reasonable-performance filter.
`"best"`	: The highest-quality available.
`"nearest"`	: Nearest-neighbor filtering (blocky).
`"bilinear"`	: Linear interpolation in two dimensions.

Usage:

for _, quality in ipairs {"fast", "good", "best", "nearest", "bilinear"} do
   local w = wibox.widget {
       {
           {
               image           = img,
               forced_height   = 64,
               forced_width    = 96,
               scaling_quality = quality,
               widget          = wibox.widget.imagebox
           },
           widget = wibox.container.place
       },
       widget = wibox.container.background
   }
end

Click to display more

Emit signals:

property::scaling_quality When the scaling_quality value changes.

self wibox.widget.imagebox The object which changed (useful when connecting many object to the same callback).
new_value scaling_quality The new value affected to the property.

🔗 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

🔗 :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().

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

Connect to a signal.

Parameters:

Name		Type(s)	Description
name		string	The name of the signal.
func		function	The callback to call when the signal is emitted.

🔗 :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.

🔗 :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".

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

Disconnect from a signal.

Parameters:

Name		Type(s)	Description
name		string	The name of the signal.
func		function	The callback that should be disconnected.

Theme variables

🔗 beautiful.notification_icon_resize_strategy number

The default way to resize the icon.
Click to display more

Used by:

resize_strategy How small icons are handled.

🔗 beautiful.notification_icon_size number

The default notification icon size.

Type constraints:

Name		Type(s)	Description
notification_icon_size		number	The size (in pixels).

Click to display more

Used by:

icon_size Desired icon size in px.
icon_size Desired icon size in px.
resize_strategy How small icons are handled.

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.

wibox.container.place	A container used to place smaller widgets into larger space.	module
halign	The horizontal alignment.	object properties

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Module: naughty.widget.icon

Usage:

Class Hierarchy

Info:

See also:

Constructors

Object properties

Object methods

Theme variables

Signals

Constructors

Parameters:

Object properties

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Consumed theme variables:

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Usage:

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Constraints:

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Constraints:

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Constraints:

Usage:

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Usage:

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Constraints:

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Constraints:

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Usage:

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Usage:

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Constraints:

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Emit signals:

Constraints:

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Usage:

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Module: `naughty.widget.icon`