Create palette preview for color correction.
Bug: 145968068 Test: make RunSettingsRoboTests ROBOTEST_FILTER=PaletteListViewTest Test: make RunSettingsRoboTests2 Change-Id: If624c8ab5b6c212b5a3ad97ceac57404d34b9deb
This commit is contained in:
JasperChang
292
src/com/android/settings/accessibility/PaletteListView.java
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292
src/com/android/settings/accessibility/PaletteListView.java
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/*
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* Copyright (C) 2020 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 com.android.settings.accessibility;
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import android.annotation.NonNull;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Color;
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import android.graphics.drawable.GradientDrawable;
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import android.graphics.drawable.GradientDrawable.Orientation;
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import android.util.AttributeSet;
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import android.util.DisplayMetrics;
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import android.view.Display;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.WindowManager;
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import android.widget.BaseAdapter;
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import android.widget.ListView;
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import android.widget.TextView;
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import androidx.annotation.VisibleForTesting;
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import com.android.settingslib.widget.R;
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import com.google.common.collect.Iterables;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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/**
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* Custom ListView {@link ListView} which displays palette to deploy the color code preview.
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*
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* <p>The preview shows gradient from color white to specific color code on each list view item, in
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* addition, text view adjusts the attribute of width for adapting the text length.
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*
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* <p>The text cannot fills the whole view for ensuring the gradient color preview can purely
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* display also the view background shows the color beside the text variable end point.
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*/
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public class PaletteListView extends ListView {
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private static final float VIEW_PITCH = 0.05f;
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private final Context mContext;
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private final DisplayAdapter mDisplayAdapter;
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private final LayoutInflater mLayoutInflater;
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private final String mDefaultGradientColorCodeString;
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private final int mDefaultGradientColor;
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private float mTextBound;
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public PaletteListView(Context context) {
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this(context, null);
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}
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public PaletteListView(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public PaletteListView(Context context, AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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mContext = context;
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mDisplayAdapter = new DisplayAdapter();
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mLayoutInflater = LayoutInflater.from(context);
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mDefaultGradientColorCodeString =
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getResources().getString(R.color.palette_list_gradient_background);
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mDefaultGradientColor =
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getResources().getColor(R.color.palette_list_gradient_background, null);
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mTextBound = 0.0f;
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init();
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}
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private static int getScreenWidth(WindowManager windowManager) {
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final Display display = windowManager.getDefaultDisplay();
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final DisplayMetrics displayMetrics = new DisplayMetrics();
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display.getMetrics(displayMetrics);
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return displayMetrics.widthPixels;
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}
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private void init() {
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final TypedArray colorNameArray = getResources().obtainTypedArray(
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R.array.setting_palette_colors);
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final TypedArray colorCodeArray = getResources().obtainTypedArray(
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R.array.setting_palette_data);
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final int colorNameArrayLength = colorNameArray.length();
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final List<ColorAttributes> colorList = new ArrayList<>();
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computeTextWidthBounds(colorNameArray);
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for (int index = 0; index < colorNameArrayLength; index++) {
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colorList.add(
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new ColorAttributes(
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/* colorName= */ colorNameArray.getString(index),
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/* colorCode= */ colorCodeArray.getColor(index, mDefaultGradientColor),
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/* textBound= */ mTextBound,
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/* gradientDrawable= */
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new GradientDrawable(Orientation.LEFT_RIGHT, null)));
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}
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mDisplayAdapter.setColorList(colorList);
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setAdapter(mDisplayAdapter);
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setDividerHeight(/* height= */ 0);
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}
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/**
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* Sets string array that required the color name and color code for deploy the new color
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* preview.
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*
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* <p>The parameters not allow null define but two array length inconsistent are acceptable, in
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* addition, to prevent IndexOutOfBoundsException the algorithm will check array data, and base
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* on the array size to display data, or fills color code array if length less than other.
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*
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* @param colorNames a string array of color name
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* @param colorCodes a string array of color code
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* @return true if new array data apply successful
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*/
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@VisibleForTesting
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boolean setPaletteListColors(@NonNull String[] colorNames, @NonNull String[] colorCodes) {
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if (colorNames == null || colorCodes == null) {
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return false;
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}
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final int colorNameArrayLength = colorNames.length;
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final int colorCodeArrayLength = colorCodes.length;
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final List<ColorAttributes> colorList = new ArrayList<>();
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final String[] colorCodeArray = fillColorCodeArray(colorCodes, colorNameArrayLength,
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colorCodeArrayLength);
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computeTextWidthBounds(colorNames);
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for (int index = 0; index < colorNameArrayLength; index++) {
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colorList.add(
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new ColorAttributes(
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/* colorName= */ colorNames[index],
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/* colorCode= */ Color.parseColor(colorCodeArray[index]),
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/* textBound= */ mTextBound,
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/* gradientDrawable= */
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new GradientDrawable(Orientation.LEFT_RIGHT, null)));
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}
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mDisplayAdapter.setColorList(colorList);
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mDisplayAdapter.notifyDataSetChanged();
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return true;
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}
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private String[] fillColorCodeArray(String[] colorCodes, int colorNameArrayLength,
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int colorCodeArrayLength) {
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if (colorNameArrayLength == colorCodeArrayLength
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|| colorNameArrayLength < colorCodeArrayLength) {
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return colorCodes;
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}
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final String[] colorCodeArray = new String[colorNameArrayLength];
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for (int index = 0; index < colorNameArrayLength; index++) {
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if (index < colorCodeArrayLength) {
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colorCodeArray[index] = colorCodes[index];
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} else {
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colorCodeArray[index] = mDefaultGradientColorCodeString;
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}
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}
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return colorCodeArray;
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}
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private void computeTextWidthBounds(TypedArray colorNameTypedArray) {
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final int colorNameArrayLength = colorNameTypedArray.length();
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final String[] colorNames = new String[colorNameArrayLength];
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for (int index = 0; index < colorNameArrayLength; index++) {
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colorNames[index] = colorNameTypedArray.getString(index);
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}
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measureBound(colorNames);
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}
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private void computeTextWidthBounds(String[] colorNameArray) {
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final int colorNameArrayLength = colorNameArray.length;
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final String[] colorNames = new String[colorNameArrayLength];
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for (int index = 0; index < colorNameArrayLength; index++) {
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colorNames[index] = colorNameArray[index];
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}
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measureBound(colorNames);
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}
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private void measureBound(String[] dataArray) {
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final WindowManager windowManager = (WindowManager) mContext.getSystemService(
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Context.WINDOW_SERVICE);
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final View view = mLayoutInflater.inflate(R.layout.palette_listview_item, null);
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final TextView textView = view.findViewById(R.id.item_textview);
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final List<String> colorNameList = new ArrayList<>(Arrays.asList(dataArray));
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Collections.sort(colorNameList, Comparator.comparing(String::length));
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// Gets the last index of list which sort by text length.
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textView.setText(Iterables.getLast(colorNameList));
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final float textWidth = textView.getPaint().measureText(textView.getText().toString());
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// Computes rate of text width compare to screen width, and measures the round the double
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// to two decimal places manually.
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final float textBound = Math.round(textWidth / getScreenWidth(windowManager) * 100) / 100f;
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mTextBound = textBound + VIEW_PITCH;
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}
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private static class ViewHolder {
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public TextView textView;
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}
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/** An adapter that converts color text title and color code to text views. */
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private final class DisplayAdapter extends BaseAdapter {
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private List<ColorAttributes> mColorList;
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@Override
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public int getCount() {
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return mColorList.size();
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}
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@Override
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public Object getItem(int position) {
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return mColorList.get(position);
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}
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@Override
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public long getItemId(int position) {
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return position;
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}
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@Override
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public View getView(int position, View convertView, ViewGroup parent) {
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final ViewHolder viewHolder;
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final ColorAttributes paletteAttribute = mColorList.get(position);
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final String colorName = paletteAttribute.getColorName();
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final GradientDrawable gradientDrawable = paletteAttribute.getGradientDrawable();
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if (convertView == null) {
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convertView = mLayoutInflater.inflate(R.layout.palette_listview_item, null);
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viewHolder = new ViewHolder();
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viewHolder.textView = convertView.findViewById(R.id.item_textview);
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convertView.setTag(viewHolder);
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} else {
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viewHolder = (ViewHolder) convertView.getTag();
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}
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viewHolder.textView.setText(colorName);
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viewHolder.textView.setBackground(gradientDrawable);
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return convertView;
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}
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protected void setColorList(List<ColorAttributes> colorList) {
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mColorList = colorList;
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}
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}
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private final class ColorAttributes {
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private final int mColorIndex = 2; // index for inject color.
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private final int mColorOffsetIndex = 1; // index for offset effect.
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private final String mColorName;
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private final GradientDrawable mGradientDrawable;
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private final int[] mGradientColors =
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{/* startColor=*/ mDefaultGradientColor, /* centerColor=*/ mDefaultGradientColor,
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/* endCode= */ 0};
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private final float[] mGradientOffsets =
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{/* starOffset= */ 0.0f, /* centerOffset= */ 0.5f, /* endOffset= */ 1.0f};
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ColorAttributes(
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String colorName, int colorCode, float textBound,
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GradientDrawable gradientDrawable) {
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mGradientColors[mColorIndex] = colorCode;
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mGradientOffsets[mColorOffsetIndex] = textBound;
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gradientDrawable.setColors(mGradientColors, mGradientOffsets);
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mColorName = colorName;
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mGradientDrawable = gradientDrawable;
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}
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public String getColorName() {
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return mColorName;
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}
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public GradientDrawable getGradientDrawable() {
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return mGradientDrawable;
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}
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}
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}
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