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[JEWEL-877] Include CSS LinearGradientBrush and sample
This adds the `Brush.cssLinearGradientBrush()` API, which allows users to draw linear gradients using a CSS-like semantic. This is based on a blog post I wrote last year, and it's been used as-is already in the Gemini in Android Studio UI. In addition to the brush itself, this also adds a Brushes section to the showcase where one can test and preview this brush' behaviour with different parameters. Lastly, this adds a few colour helper functions, including overloads for existing ones (that are now deprecated in favour of the new ones). This brings all colour util functions to support both ARGB and RGBA in both input and output, to/from AWT and Compose `Color`s. We also now finally have unit tests and proper KDoc for all the util functions. Note: we're explicitly excluding the IDE sample plugin from the GitHub CI as it's bound to have compilation issues as we add new APIs that aren't yet available in a target build of the IDE. We still run ktlint and ktfmt for the IDE sample, as they do not depend on compileKotlin. closes #3121 GitOrigin-RevId: d512f23028d444e38a1018ea6e2ed0f44afd91f3
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‎platform/jewel/samples/showcase/api-dump.txt‎

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@@ -1,3 +1,42 @@
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f:org.jetbrains.jewel.samples.showcase.ShowcaseIcons
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- sf:$stable:I
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- sf:INSTANCE:org.jetbrains.jewel.samples.showcase.ShowcaseIcons
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- f:getComponentsMenu():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getGitHub():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getJewelLogo():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getMarkdown():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getThemeDark():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getThemeLight():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getThemeLightWithLightHeader():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getThemeSystem():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getWelcome():org.jetbrains.jewel.ui.icon.PathIconKey
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f:org.jetbrains.jewel.samples.showcase.ShowcaseIcons$Components
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- sf:$stable:I
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- sf:INSTANCE:org.jetbrains.jewel.samples.showcase.ShowcaseIcons$Components
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- f:getBanners():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getBorders():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getBrush():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getButton():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getCheckbox():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getComboBox():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getLinks():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getProgressBar():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getRadioButton():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getScrollbar():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getSegmentedControls():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getSlider():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getSplitlayout():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getTabs():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getTextArea():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getTextField():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getToolbar():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getTooltip():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getTree():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getTypography():org.jetbrains.jewel.ui.icon.PathIconKey
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f:org.jetbrains.jewel.samples.showcase.ShowcaseIcons$ProgrammingLanguages
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- sf:$stable:I
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- sf:INSTANCE:org.jetbrains.jewel.samples.showcase.ShowcaseIcons$ProgrammingLanguages
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- f:getKotlin():org.jetbrains.jewel.ui.icon.PathIconKey
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f:org.jetbrains.jewel.samples.showcase.components.BannersKt
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- sf:Banners(androidx.compose.runtime.Composer,I):V
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f:org.jetbrains.jewel.samples.showcase.components.BordersKt
@@ -124,44 +163,6 @@ f:org.jetbrains.jewel.samples.showcase.components.ScrollbarsKt
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- sf:Scrollbars(org.jetbrains.jewel.ui.component.styling.ScrollbarVisibility,org.jetbrains.jewel.ui.component.styling.ScrollbarVisibility,androidx.compose.runtime.Composer,I):V
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f:org.jetbrains.jewel.samples.showcase.components.SegmentedControlsKt
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- sf:SegmentedControls(androidx.compose.runtime.Composer,I):V
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f:org.jetbrains.jewel.samples.showcase.components.ShowcaseIcons
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- sf:$stable:I
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- sf:INSTANCE:org.jetbrains.jewel.samples.showcase.components.ShowcaseIcons
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- f:getComponentsMenu():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getGitHub():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getJewelLogo():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getMarkdown():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getThemeDark():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getThemeLight():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getThemeLightWithLightHeader():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getThemeSystem():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getWelcome():org.jetbrains.jewel.ui.icon.PathIconKey
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f:org.jetbrains.jewel.samples.showcase.components.ShowcaseIcons$Components
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- sf:$stable:I
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- sf:INSTANCE:org.jetbrains.jewel.samples.showcase.components.ShowcaseIcons$Components
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- f:getBanners():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getBorders():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getButton():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getCheckbox():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getComboBox():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getLinks():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getProgressBar():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getRadioButton():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getScrollbar():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getSegmentedControls():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getSlider():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getSplitlayout():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getTabs():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getTextArea():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getTextField():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getToolbar():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getTooltip():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getTree():org.jetbrains.jewel.ui.icon.PathIconKey
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- f:getTypography():org.jetbrains.jewel.ui.icon.PathIconKey
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f:org.jetbrains.jewel.samples.showcase.components.ShowcaseIcons$ProgrammingLanguages
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- sf:$stable:I
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- sf:INSTANCE:org.jetbrains.jewel.samples.showcase.components.ShowcaseIcons$ProgrammingLanguages
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- f:getKotlin():org.jetbrains.jewel.ui.icon.PathIconKey
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f:org.jetbrains.jewel.samples.showcase.components.SliderKt
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- sf:Sliders(androidx.compose.runtime.Composer,I):V
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f:org.jetbrains.jewel.samples.showcase.components.SplitLayoutsKt
@@ -189,6 +190,7 @@ f:org.jetbrains.jewel.samples.showcase.views.ComposableSingletons$ComponentsView
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- sf:INSTANCE:org.jetbrains.jewel.samples.showcase.views.ComposableSingletons$ComponentsViewModelKt
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- <init>():V
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- f:getLambda$-1046460726$intellij_platform_jewel_samples_showcase():kotlin.jvm.functions.Function2
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- f:getLambda$-1136736643$intellij_platform_jewel_samples_showcase():kotlin.jvm.functions.Function2
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- f:getLambda$-1239391927$intellij_platform_jewel_samples_showcase():kotlin.jvm.functions.Function2
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- f:getLambda$-1329667844$intellij_platform_jewel_samples_showcase():kotlin.jvm.functions.Function2
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- f:getLambda$-1432323128$intellij_platform_jewel_samples_showcase():kotlin.jvm.functions.Function2

‎platform/jewel/samples/showcase/src/main/kotlin/org/jetbrains/jewel/samples/showcase/components/ShowcaseIcons.kt‎ renamed to ‎platform/jewel/samples/showcase/src/main/kotlin/org/jetbrains/jewel/samples/showcase/ShowcaseIcons.kt‎

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// Copyright 2000-2025 JetBrains s.r.o. and contributors. Use of this source code is governed by the
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// Apache 2.0 license.
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package org.jetbrains.jewel.samples.showcase.components
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// Copyright 2000-2025 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
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package org.jetbrains.jewel.samples.showcase
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import org.jetbrains.jewel.ui.icon.PathIconKey
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@@ -19,6 +18,7 @@ public object ShowcaseIcons {
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public object Components {
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public val banners: PathIconKey = PathIconKey("icons/components/banners.svg", ShowcaseIcons::class.java)
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public val borders: PathIconKey = PathIconKey("icons/components/borders.svg", ShowcaseIcons::class.java)
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public val brush: PathIconKey = PathIconKey("icons/components/brush.svg", ShowcaseIcons::class.java)
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public val button: PathIconKey = PathIconKey("icons/components/button.svg", ShowcaseIcons::class.java)
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public val checkbox: PathIconKey = PathIconKey("icons/components/checkBox.svg", ShowcaseIcons::class.java)
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public val comboBox: PathIconKey = PathIconKey("icons/components/comboBox.svg", ShowcaseIcons::class.java)

‎platform/jewel/samples/showcase/src/main/kotlin/org/jetbrains/jewel/samples/showcase/components/ComboBoxes.kt‎

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import androidx.compose.ui.text.style.TextOverflow
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import androidx.compose.ui.unit.dp
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import org.jetbrains.jewel.foundation.theme.JewelTheme
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import org.jetbrains.jewel.samples.showcase.ShowcaseIcons
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import org.jetbrains.jewel.ui.component.ComboBox
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import org.jetbrains.jewel.ui.component.DefaultButton
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import org.jetbrains.jewel.ui.component.EditableComboBox

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