107 lines
3.7 KiB
Java
107 lines
3.7 KiB
Java
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.support.v7.internal.widget;
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import android.content.Context;
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import android.content.res.ColorStateList;
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import android.content.res.TypedArray;
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import android.graphics.Color;
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import android.support.v4.graphics.ColorUtils;
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import android.util.TypedValue;
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class ThemeUtils {
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private static final ThreadLocal<TypedValue> TL_TYPED_VALUE = new ThreadLocal<>();
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private static final int[] DISABLED_STATE_SET = new int[]{-android.R.attr.state_enabled};
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private static final int[] EMPTY_STATE_SET = new int[0];
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private static final int[] TEMP_ARRAY = new int[1];
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static ColorStateList createDisabledStateList(int textColor, int disabledTextColor) {
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// Now create a new ColorStateList with the default color, and the new disabled
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// color
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final int[][] states = new int[2][];
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final int[] colors = new int[2];
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int i = 0;
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// Disabled state
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states[i] = DISABLED_STATE_SET;
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colors[i] = disabledTextColor;
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i++;
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// Default state
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states[i] = EMPTY_STATE_SET;
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colors[i] = textColor;
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i++;
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return new ColorStateList(states, colors);
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}
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static int getThemeAttrColor(Context context, int attr) {
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TEMP_ARRAY[0] = attr;
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TypedArray a = context.obtainStyledAttributes(null, TEMP_ARRAY);
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try {
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return a.getColor(0, 0);
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} finally {
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a.recycle();
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}
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}
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static ColorStateList getThemeAttrColorStateList(Context context, int attr) {
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TEMP_ARRAY[0] = attr;
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TypedArray a = context.obtainStyledAttributes(null, TEMP_ARRAY);
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try {
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return a.getColorStateList(0);
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} finally {
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a.recycle();
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}
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}
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static int getDisabledThemeAttrColor(Context context, int attr) {
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final ColorStateList csl = getThemeAttrColorStateList(context, attr);
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if (csl != null && csl.isStateful()) {
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// If the CSL is stateful, we'll assume it has a disabled state and use it
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return csl.getColorForState(DISABLED_STATE_SET, csl.getDefaultColor());
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} else {
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// Else, we'll generate the color using disabledAlpha from the theme
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final TypedValue tv = getTypedValue();
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// Now retrieve the disabledAlpha value from the theme
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context.getTheme().resolveAttribute(android.R.attr.disabledAlpha, tv, true);
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final float disabledAlpha = tv.getFloat();
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return getThemeAttrColor(context, attr, disabledAlpha);
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}
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}
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private static TypedValue getTypedValue() {
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TypedValue typedValue = TL_TYPED_VALUE.get();
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if (typedValue == null) {
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typedValue = new TypedValue();
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TL_TYPED_VALUE.set(typedValue);
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}
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return typedValue;
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}
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static int getThemeAttrColor(Context context, int attr, float alpha) {
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final int color = getThemeAttrColor(context, attr);
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final int originalAlpha = Color.alpha(color);
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return ColorUtils.setAlphaComponent(color, Math.round(originalAlpha * alpha));
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}
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}
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