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/*
* Copyright (C) 2020 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.settings.accessibility;
import static android.graphics.drawable.GradientDrawable.Orientation;
import static com.android.settings.accessibility.AccessibilityUtil.getScreenHeightPixels;
import static com.android.settings.accessibility.AccessibilityUtil.getScreenWidthPixels;
import static com.google.common.primitives.Ints.max;
import android.content.Context;
import android.graphics.Paint.FontMetrics;
import android.graphics.drawable.GradientDrawable;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.ColorInt;
import androidx.annotation.IntDef;
import androidx.preference.Preference;
import androidx.preference.PreferenceViewHolder;
import com.android.settings.R;
import com.google.common.primitives.Floats;
import com.google.common.primitives.Ints;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;
/** Preference that easier preview by matching name to color. */
public final class PaletteListPreference extends Preference {
private final List<Integer> mGradientColors = new ArrayList<>();
private final List<Float> mGradientOffsets = new ArrayList<>();
@IntDef({
Position.START,
Position.CENTER,
Position.END,
})
@Retention(RetentionPolicy.SOURCE)
@interface Position {
int START = 0;
int CENTER = 1;
int END = 2;
}
/**
* Constructs a new PaletteListPreference with the given context's theme and the supplied
* attribute set.
*
* @param context The Context this is associated with, through which it can access the current
* theme, resources, etc.
* @param attrs The attributes of the XML tag that is inflating the view.
*/
public PaletteListPreference(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
/**
* Constructs a new PaletteListPreference with the given context's theme, the supplied
* attribute set, and default style attribute.
*
* @param context The Context this is associated with, through which it can access the
* current theme, resources, etc.
* @param attrs The attributes of the XML tag that is inflating the view.
* @param defStyleAttr An attribute in the current theme that contains a reference to a style
* resource that supplies default
* values for the view. Can be 0 to not look for
* defaults.
*/
public PaletteListPreference(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
setLayoutResource(R.layout.daltonizer_preview);
}
@Override
public void onBindViewHolder(PreferenceViewHolder holder) {
super.onBindViewHolder(holder);
final ViewGroup paletteView = holder.itemView.findViewById(R.id.palette_view);
initPaletteAttributes(getContext());
initPaletteView(getContext(), paletteView);
}
private void initPaletteAttributes(Context context) {
final int defaultColor = context.getColor(R.color.palette_list_gradient_background);
mGradientColors.add(Position.START, defaultColor);
mGradientColors.add(Position.CENTER, defaultColor);
mGradientColors.add(Position.END, defaultColor);
mGradientOffsets.add(Position.START, /* element= */ 0.0f);
mGradientOffsets.add(Position.CENTER, /* element= */ 0.5f);
mGradientOffsets.add(Position.END, /* element= */ 1.0f);
}
private void initPaletteView(Context context, ViewGroup rootView) {
if (rootView.getChildCount() > 0) {
rootView.removeAllViews();
}
final List<Integer> paletteColors = getPaletteColors(context);
final List<String> paletteData = getPaletteData(context);
final float textPadding =
context.getResources().getDimension(R.dimen.accessibility_layout_margin_start_end);
final String maxLengthData =
Collections.max(paletteData, Comparator.comparing(String::length));
final int textWidth = getTextWidth(context, maxLengthData);
final float textBound = (textWidth + textPadding) / getScreenWidthPixels(context);
mGradientOffsets.set(Position.CENTER, textBound);
final int screenHalfHeight = getScreenHeightPixels(context) / 2;
final int paletteItemHeight =
max(screenHalfHeight / paletteData.size(), getTextLineHeight(context));
for (int i = 0; i < paletteData.size(); ++i) {
final TextView textView = new TextView(context);
textView.setText(paletteData.get(i));
textView.setHeight(paletteItemHeight);
textView.setPaddingRelative(Math.round(textPadding), 0, 0, 0);
textView.setGravity(Gravity.CENTER_VERTICAL);
textView.setBackground(createGradientDrawable(rootView, paletteColors.get(i)));
rootView.addView(textView);
}
}
private GradientDrawable createGradientDrawable(ViewGroup rootView, @ColorInt int color) {
mGradientColors.set(Position.END, color);
final GradientDrawable gradientDrawable = new GradientDrawable();
final Orientation orientation =
rootView.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL
? Orientation.RIGHT_LEFT
: Orientation.LEFT_RIGHT;
gradientDrawable.setOrientation(orientation);
gradientDrawable.setColors(Ints.toArray(mGradientColors), Floats.toArray(mGradientOffsets));
return gradientDrawable;
}
private List<Integer> getPaletteColors(Context context) {
final int[] paletteResources =
context.getResources().getIntArray(R.array.setting_palette_colors);
return Arrays.stream(paletteResources).boxed().collect(Collectors.toList());
}
private List<String> getPaletteData(Context context) {
final String[] paletteResources =
context.getResources().getStringArray(R.array.setting_palette_data);
return Arrays.asList(paletteResources);
}
private int getTextWidth(Context context, String text) {
final TextView tempView = new TextView(context);
return Math.round(tempView.getPaint().measureText(text));
}
private int getTextLineHeight(Context context) {
final TextView tempView = new TextView(context);
final FontMetrics fontMetrics = tempView.getPaint().getFontMetrics();
return Math.round(fontMetrics.bottom - fontMetrics.top);
}
}
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