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Bevy Feathers: an opinionated widget toolkit for building Bevy tooling (#19730)
# Objective This PR introduces Bevy Feathers, an opinionated widget toolkit and theming system intended for use by the Bevy Editor, World Inspector, and other tools. The `bevy_feathers` crate is incomplete and hidden behind an experimental feature flag. The API is going to change significantly before release. --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
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Cargo.toml

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@@ -306,6 +306,9 @@ bevy_input_focus = ["bevy_internal/bevy_input_focus"]
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# Headless widget collection for Bevy UI.
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bevy_core_widgets = ["bevy_internal/bevy_core_widgets"]
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# Feathers widget collection.
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experimental_bevy_feathers = ["bevy_internal/bevy_feathers"]
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# Enable passthrough loading for SPIR-V shaders (Only supported on Vulkan, shader capabilities and extensions must agree with the platform implementation)
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spirv_shader_passthrough = ["bevy_internal/spirv_shader_passthrough"]
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description = "Demonstrates use of core (headless) widgets in Bevy UI, with Observers"
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category = "UI (User Interface)"
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wasm = true
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[[example]]
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name = "feathers"
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path = "examples/ui/feathers.rs"
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doc-scrape-examples = true
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required-features = ["experimental_bevy_feathers"]
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[package.metadata.example.feathers]
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name = "Feathers Widgets"
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description = "Gallery of Feathers Widgets"
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category = "UI (User Interface)"
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wasm = true
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hidden = true

crates/bevy_core_widgets/src/core_button.rs

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@@ -18,7 +18,7 @@ use bevy_ui::{InteractionDisabled, Pressed};
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/// Headless button widget. This widget maintains a "pressed" state, which is used to
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/// indicate whether the button is currently being pressed by the user. It emits a `ButtonClicked`
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/// event when the button is un-pressed.
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#[derive(Component, Debug)]
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#[derive(Component, Default, Debug)]
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#[require(AccessibilityNode(accesskit::Node::new(Role::Button)))]
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pub struct CoreButton {
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/// Optional system to run when the button is clicked, or when the Enter or Space key

crates/bevy_core_widgets/src/core_slider.rs

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#[derive(Component, Debug, PartialEq, Clone, Copy)]
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#[component(immutable)]
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pub struct SliderRange {
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/// The beginning of the allowed range for the slider value.
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start: f32,
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/// The end of the allowed range for the slider value.
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end: f32,
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}
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crates/bevy_feathers/Cargo.toml

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[package]
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name = "bevy_feathers"
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version = "0.17.0-dev"
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edition = "2024"
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description = "A collection of UI widgets for building editors and utilities in Bevy"
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homepage = "https://bevyengine.org"
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repository = "https://github.com/bevyengine/bevy"
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license = "MIT OR Apache-2.0"
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keywords = ["bevy"]
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[dependencies]
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# bevy
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bevy_app = { path = "../bevy_app", version = "0.17.0-dev" }
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bevy_asset = { path = "../bevy_asset", version = "0.17.0-dev" }
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bevy_color = { path = "../bevy_color", version = "0.17.0-dev" }
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bevy_core_widgets = { path = "../bevy_core_widgets", version = "0.17.0-dev" }
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bevy_ecs = { path = "../bevy_ecs", version = "0.17.0-dev" }
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bevy_input_focus = { path = "../bevy_input_focus", version = "0.17.0-dev" }
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bevy_log = { path = "../bevy_log", version = "0.17.0-dev" }
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bevy_picking = { path = "../bevy_picking", version = "0.17.0-dev" }
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bevy_platform = { path = "../bevy_platform", version = "0.17.0-dev" }
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bevy_text = { path = "../bevy_text", version = "0.17.0-dev" }
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bevy_ui = { path = "../bevy_ui", version = "0.17.0-dev", features = [
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"bevy_ui_picking_backend",
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] }
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bevy_window = { path = "../bevy_window", version = "0.17.0-dev" }
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bevy_winit = { path = "../bevy_winit", version = "0.17.0-dev" }
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# other
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accesskit = "0.19"
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[features]
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default = []
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[lints]
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workspace = true
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[package.metadata.docs.rs]
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rustdoc-args = ["-Zunstable-options", "--generate-link-to-definition"]
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all-features = true
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Digitized data copyright (c) 2012-2015, The Mozilla Foundation and Telefonica S.A.
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This Font Software is licensed under the SIL Open Font License, Version 1.1.
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This license is copied below, and is also available with a FAQ at:
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http://scripts.sil.org/OFL
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-----------------------------------------------------------
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SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
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-----------------------------------------------------------
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PREAMBLE
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The goals of the Open Font License (OFL) are to stimulate worldwide
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development of collaborative font projects, to support the font creation
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efforts of academic and linguistic communities, and to provide a free and
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open framework in which fonts may be shared and improved in partnership
17+
with others.
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The OFL allows the licensed fonts to be used, studied, modified and
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redistributed freely as long as they are not sold by themselves. The
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fonts, including any derivative works, can be bundled, embedded,
22+
redistributed and/or sold with any software provided that any reserved
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names are not used by derivative works. The fonts and derivatives,
24+
however, cannot be released under any other type of license. The
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requirement for fonts to remain under this license does not apply
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to any document created using the fonts or their derivatives.
27+
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DEFINITIONS
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"Font Software" refers to the set of files released by the Copyright
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Holder(s) under this license and clearly marked as such. This may
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include source files, build scripts and documentation.
32+
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"Reserved Font Name" refers to any names specified as such after the
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copyright statement(s).
35+
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"Original Version" refers to the collection of Font Software components as
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distributed by the Copyright Holder(s).
38+
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"Modified Version" refers to any derivative made by adding to, deleting,
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or substituting -- in part or in whole -- any of the components of the
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Original Version, by changing formats or by porting the Font Software to a
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new environment.
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"Author" refers to any designer, engineer, programmer, technical
45+
writer or other person who contributed to the Font Software.
46+
47+
PERMISSION & CONDITIONS
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of the Font Software, to use, study, copy, merge, embed, modify,
50+
redistribute, and sell modified and unmodified copies of the Font
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Software, subject to the following conditions:
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1) Neither the Font Software nor any of its individual components,
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in Original or Modified Versions, may be sold by itself.
55+
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2) Original or Modified Versions of the Font Software may be bundled,
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redistributed and/or sold with any software, provided that each copy
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contains the above copyright notice and this license. These can be
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included either as stand-alone text files, human-readable headers or
60+
in the appropriate machine-readable metadata fields within text or
61+
binary files as long as those fields can be easily viewed by the user.
62+
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3) No Modified Version of the Font Software may use the Reserved Font
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Name(s) unless explicit written permission is granted by the corresponding
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Copyright Holder. This restriction only applies to the primary font name as
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presented to the users.
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4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
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Software shall not be used to promote, endorse or advertise any
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Modified Version, except to acknowledge the contribution(s) of the
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Copyright Holder(s) and the Author(s) or with their explicit written
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permission.
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5) The Font Software, modified or unmodified, in part or in whole,
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must be distributed entirely under this license, and must not be
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distributed under any other license. The requirement for fonts to
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remain under this license does not apply to any document created
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using the Font Software.
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TERMINATION
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This license becomes null and void if any of the above conditions are
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not met.
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DISCLAIMER
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THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
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OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
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COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
91+
DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
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OTHER DEALINGS IN THE FONT SOFTWARE.
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@@ -0,0 +1,93 @@
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Copyright (c) 2012-2015, The Mozilla Foundation and Telefonica S.A.
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This Font Software is licensed under the SIL Open Font License, Version 1.1.
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This license is copied below, and is also available with a FAQ at:
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https://openfontlicense.org
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7+
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-----------------------------------------------------------
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SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
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-----------------------------------------------------------
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12+
PREAMBLE
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The goals of the Open Font License (OFL) are to stimulate worldwide
14+
development of collaborative font projects, to support the font creation
15+
efforts of academic and linguistic communities, and to provide a free and
16+
open framework in which fonts may be shared and improved in partnership
17+
with others.
18+
19+
The OFL allows the licensed fonts to be used, studied, modified and
20+
redistributed freely as long as they are not sold by themselves. The
21+
fonts, including any derivative works, can be bundled, embedded,
22+
redistributed and/or sold with any software provided that any reserved
23+
names are not used by derivative works. The fonts and derivatives,
24+
however, cannot be released under any other type of license. The
25+
requirement for fonts to remain under this license does not apply
26+
to any document created using the fonts or their derivatives.
27+
28+
DEFINITIONS
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"Font Software" refers to the set of files released by the Copyright
30+
Holder(s) under this license and clearly marked as such. This may
31+
include source files, build scripts and documentation.
32+
33+
"Reserved Font Name" refers to any names specified as such after the
34+
copyright statement(s).
35+
36+
"Original Version" refers to the collection of Font Software components as
37+
distributed by the Copyright Holder(s).
38+
39+
"Modified Version" refers to any derivative made by adding to, deleting,
40+
or substituting -- in part or in whole -- any of the components of the
41+
Original Version, by changing formats or by porting the Font Software to a
42+
new environment.
43+
44+
"Author" refers to any designer, engineer, programmer, technical
45+
writer or other person who contributed to the Font Software.
46+
47+
PERMISSION & CONDITIONS
48+
Permission is hereby granted, free of charge, to any person obtaining
49+
a copy of the Font Software, to use, study, copy, merge, embed, modify,
50+
redistribute, and sell modified and unmodified copies of the Font
51+
Software, subject to the following conditions:
52+
53+
1) Neither the Font Software nor any of its individual components,
54+
in Original or Modified Versions, may be sold by itself.
55+
56+
2) Original or Modified Versions of the Font Software may be bundled,
57+
redistributed and/or sold with any software, provided that each copy
58+
contains the above copyright notice and this license. These can be
59+
included either as stand-alone text files, human-readable headers or
60+
in the appropriate machine-readable metadata fields within text or
61+
binary files as long as those fields can be easily viewed by the user.
62+
63+
3) No Modified Version of the Font Software may use the Reserved Font
64+
Name(s) unless explicit written permission is granted by the corresponding
65+
Copyright Holder. This restriction only applies to the primary font name as
66+
presented to the users.
67+
68+
4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
69+
Software shall not be used to promote, endorse or advertise any
70+
Modified Version, except to acknowledge the contribution(s) of the
71+
Copyright Holder(s) and the Author(s) or with their explicit written
72+
permission.
73+
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5) The Font Software, modified or unmodified, in part or in whole,
75+
must be distributed entirely under this license, and must not be
76+
distributed under any other license. The requirement for fonts to
77+
remain under this license does not apply to any document created
78+
using the Font Software.
79+
80+
TERMINATION
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This license becomes null and void if any of the above conditions are
82+
not met.
83+
84+
DISCLAIMER
85+
THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
86+
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
87+
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
88+
OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
89+
COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
90+
INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
91+
DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
92+
FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
93+
OTHER DEALINGS IN THE FONT SOFTWARE.

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