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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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.android.launcher3.util;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.drawable.Drawable;
/**
* Various utility methods associated with theming.
*/
public class Themes {
public static int getColorAccent(Context context) {
return getAttrColor(context, android.R.attr.colorAccent);
}
public static int getAttrColor(Context context, int attr) {
TypedArray ta = context.obtainStyledAttributes(new int[]{attr});
int colorAccent = ta.getColor(0, 0);
ta.recycle();
return colorAccent;
}
public static boolean getAttrBoolean(Context context, int attr) {
TypedArray ta = context.obtainStyledAttributes(new int[]{attr});
boolean value = ta.getBoolean(0, false);
ta.recycle();
return value;
}
public static Drawable getAttrDrawable(Context context, int attr) {
TypedArray ta = context.obtainStyledAttributes(new int[]{attr});
Drawable value = ta.getDrawable(0);
ta.recycle();
return value;
}
public static int getAttrInteger(Context context, int attr) {
TypedArray ta = context.obtainStyledAttributes(new int[]{attr});
int value = ta.getInteger(0, 0);
ta.recycle();
return value;
}
/**
* Returns the alpha corresponding to the theme attribute {@param attr}, in the range [0, 255].
*/
public static int getAlpha(Context context, int attr) {
TypedArray ta = context.obtainStyledAttributes(new int[]{attr});
float alpha = ta.getFloat(0, 0);
ta.recycle();
return (int) (255 * alpha + 0.5f);
}
/**
* Scales a color matrix such that, when applied to color R G B A, it produces R' G' B' A' where
* R' = r * R
* G' = g * G
* B' = b * B
* A' = a * A
*
* The matrix will, for instance, turn white into r g b a, and black will remain black.
*
* @param color The color r g b a
* @param target The ColorMatrix to scale
*/
public static void setColorScaleOnMatrix(int color, ColorMatrix target) {
target.setScale(Color.red(color) / 255f, Color.green(color) / 255f,
Color.blue(color) / 255f, Color.alpha(color) / 255f);
}
/**
* Changes a color matrix such that, when applied to srcColor, it produces dstColor.
*
* Note that values on the last column of target ColorMatrix can be negative, and may result in
* negative values when applied on a color. Such negative values will be automatically shifted
* up to 0 by the framework.
*
* @param srcColor The color to start from
* @param dstColor The color to create by applying target on srcColor
* @param target The ColorMatrix to transform the color
*/
public static void setColorChangeOnMatrix(int srcColor, int dstColor, ColorMatrix target) {
target.reset();
target.getArray()[4] = Color.red(dstColor) - Color.red(srcColor);
target.getArray()[9] = Color.green(dstColor) - Color.green(srcColor);
target.getArray()[14] = Color.blue(dstColor) - Color.blue(srcColor);
target.getArray()[19] = Color.alpha(dstColor) - Color.alpha(srcColor);
}
}
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