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Button: hover and pressed background colors are now derived from actu…
…al button background color (issue #21)
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102 changes: 102 additions & 0 deletions
102
flatlaf-core/src/main/java/com/formdev/flatlaf/util/ColorFunctions.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| /* | ||
| * Copyright 2019 FormDev Software GmbH | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package com.formdev.flatlaf.util; | ||
|
|
||
| import java.awt.Color; | ||
|
|
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| /** | ||
| * Functions that modify colors. | ||
| * | ||
| * @author Karl Tauber | ||
| */ | ||
| public class ColorFunctions | ||
| { | ||
| public static Color applyFunctions( Color color, ColorFunction[] functions ) { | ||
| float[] hsl = HSLColor.fromRGB( color ); | ||
| float alpha = color.getAlpha() / 255f; | ||
|
|
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| for( ColorFunction function : functions ) | ||
| function.apply( hsl ); | ||
|
|
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| return HSLColor.toRGB( hsl, alpha ); | ||
| } | ||
|
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| private static float clamp( float value ) { | ||
| return (value < 0) | ||
| ? 0 | ||
| : ((value > 100) | ||
| ? 100 | ||
| : value); | ||
| } | ||
|
|
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| //---- interface ColorFunction -------------------------------------------- | ||
|
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| public interface ColorFunction { | ||
| void apply( float[] hsl ); | ||
| } | ||
|
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| //---- class Lighten ------------------------------------------------------ | ||
|
|
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| /** | ||
| * Increase the lightness of a color in the HSL color space by an absolute | ||
| * or relative amount. | ||
| */ | ||
| public static class Lighten | ||
| implements ColorFunction | ||
| { | ||
| private final float amount; | ||
| private final boolean relative; | ||
| private final boolean autoInverse; | ||
|
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| public Lighten( float amount, boolean relative, boolean autoInverse ) { | ||
| this.amount = amount; | ||
| this.relative = relative; | ||
| this.autoInverse = autoInverse; | ||
| } | ||
|
|
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| @Override | ||
| public void apply( float[] hsl ) { | ||
| float amount2 = autoInverse && shouldInverse( hsl ) ? -amount : amount; | ||
| hsl[2] = clamp( relative | ||
| ? (hsl[2] * ((100 + amount2) / 100)) | ||
| : (hsl[2] + amount2) ); | ||
| } | ||
|
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| protected boolean shouldInverse( float[] hsl ) { | ||
| return hsl[2] >= 50; | ||
| } | ||
| } | ||
|
|
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| //---- class Darken ------------------------------------------------------- | ||
|
|
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| /** | ||
| * Decrease the lightness of a color in the HSL color space by an absolute | ||
| * or relative amount. | ||
| */ | ||
| public static class Darken | ||
| extends Lighten | ||
| { | ||
| public Darken( float amount, boolean relative, boolean autoInverse ) { | ||
| super( -amount, relative, autoInverse ); | ||
| } | ||
|
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| @Override | ||
| protected boolean shouldInverse( float[] hsl ) { | ||
| return hsl[2] < 50; | ||
| } | ||
| } | ||
| } |
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