Adding settings screen for font size. Also factored out common
components from screen magnification settings screen. Change-Id: I1828c7c0246f14493903172f2da7419fdc8e5f09
This commit is contained in:
Noah Wang
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src/com/android/settings/PreviewSeekBarPreferenceFragment.java
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src/com/android/settings/PreviewSeekBarPreferenceFragment.java
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/*
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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 com.android.settings;
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import android.annotation.Nullable;
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import android.content.Context;
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import android.content.res.Configuration;
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import android.os.Bundle;
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import android.util.AttributeSet;
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import android.view.LayoutInflater;
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import android.view.MotionEvent;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.view.ViewGroup;
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import android.view.animation.AccelerateInterpolator;
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import android.view.animation.DecelerateInterpolator;
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import android.view.animation.Interpolator;
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import android.widget.FrameLayout;
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import android.widget.SeekBar;
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import android.widget.SeekBar.OnSeekBarChangeListener;
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import android.widget.TextView;
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/**
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* Preference fragment shows a preview and a seek bar to adjust a specific settings.
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*/
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public abstract class PreviewSeekBarPreferenceFragment extends SettingsPreferenceFragment {
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/** List of entries corresponding the settings being set. */
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protected String[] mEntries;
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/** Index of the entry corresponding to initial value of the settings. */
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protected int mInitialIndex;
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/** Index of the entry corresponding to current value of the settings. */
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protected int mCurrentIndex;
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/** Resource id of the layout for this preference fragment. */
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protected int mActivityLayoutResId;
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/** Resource id of the layout that defines the contents instide preview screen. */
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protected int mPreviewSampleResId;
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/** Duration to use when cross-fading between previews. */
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private static final long CROSS_FADE_DURATION_MS = 400;
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/** Interpolator to use when cross-fading between previews. */
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private static final Interpolator FADE_IN_INTERPOLATOR = new DecelerateInterpolator();
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/** Interpolator to use when cross-fading between previews. */
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private static final Interpolator FADE_OUT_INTERPOLATOR = new AccelerateInterpolator();
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private ViewGroup mPreviewFrame;
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private TextView mLabel;
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private View mLarger;
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private View mSmaller;
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@Override
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public View onCreateView(LayoutInflater inflater, ViewGroup container,
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Bundle savedInstanceState) {
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final View root = super.onCreateView(inflater, container, savedInstanceState);
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final ViewGroup listContainer = (ViewGroup) root.findViewById(android.R.id.list_container);
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listContainer.removeAllViews();
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final View content = inflater.inflate(mActivityLayoutResId, listContainer, false);
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listContainer.addView(content);
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mLabel = (TextView) content.findViewById(R.id.current_label);
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// The maximum SeekBar value always needs to be non-zero. If there's
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// only one available value, we'll handle this by disabling the
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// seek bar.
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final int max = Math.max(1, mEntries.length - 1);
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final SeekBar seekBar = (SeekBar) content.findViewById(R.id.seek_bar);
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seekBar.setMax(max);
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seekBar.setProgress(mInitialIndex);
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seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
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@Override
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public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
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setPreviewLayer(progress, true);
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}
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@Override
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public void onStartTrackingTouch(SeekBar seekBar) {}
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@Override
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public void onStopTrackingTouch(SeekBar seekBar) {}
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});
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mSmaller = content.findViewById(R.id.smaller);
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mSmaller.setOnClickListener(new OnClickListener() {
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@Override
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public void onClick(View v) {
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final int progress = seekBar.getProgress();
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if (progress > 0) {
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seekBar.setProgress(progress - 1, true);
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}
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}
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});
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mLarger = content.findViewById(R.id.larger);
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mLarger.setOnClickListener(new OnClickListener() {
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@Override
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public void onClick(View v) {
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final int progress = seekBar.getProgress();
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if (progress < seekBar.getMax()) {
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seekBar.setProgress(progress + 1, true);
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}
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}
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});
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if (mEntries.length == 1) {
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// The larger and smaller buttons will be disabled when we call
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// setPreviewLayer() later in this method.
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seekBar.setEnabled(false);
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}
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mPreviewFrame = (FrameLayout) content.findViewById(R.id.preview_frame);
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// Populate the sample layouts.
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final Context context = getContext();
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final Configuration origConfig = context.getResources().getConfiguration();
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for (int i = 0; i < mEntries.length; ++i) {
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final Configuration config = createConfig(origConfig, i);
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// Create a new configuration for the specified value. It won't
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// have any theme set, so manually apply the current theme.
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final Context configContext = context.createConfigurationContext(config);
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configContext.setTheme(context.getThemeResId());
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final LayoutInflater configInflater = LayoutInflater.from(configContext);
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final View sampleView = configInflater.inflate(mPreviewSampleResId, mPreviewFrame, false);
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sampleView.setAlpha(0);
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sampleView.setVisibility(View.INVISIBLE);
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mPreviewFrame.addView(sampleView);
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}
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setPreviewLayer(mInitialIndex, false);
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return root;
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}
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@Override
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public void onDetach() {
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super.onDetach();
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// This will commit the change SLIGHTLY after the activity has
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// finished, which could be considered a feature or a bug...
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commit();
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}
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/**
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* Creates new configuration based on the current position of the SeekBar.
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*/
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protected abstract Configuration createConfig(Configuration origConfig, int index);
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private void setPreviewLayer(int index, boolean animate) {
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mLabel.setText(mEntries[index]);
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if (mCurrentIndex >= 0) {
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final View lastLayer = mPreviewFrame.getChildAt(mCurrentIndex);
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if (animate) {
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lastLayer.animate()
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.alpha(0)
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.setInterpolator(FADE_OUT_INTERPOLATOR)
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.setDuration(CROSS_FADE_DURATION_MS)
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.withEndAction(new Runnable() {
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@Override
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public void run() {
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lastLayer.setVisibility(View.INVISIBLE);
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}
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});
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} else {
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lastLayer.setAlpha(0);
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lastLayer.setVisibility(View.INVISIBLE);
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}
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}
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final View nextLayer = mPreviewFrame.getChildAt(index);
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if (animate) {
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nextLayer.animate()
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.alpha(1)
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.setInterpolator(FADE_IN_INTERPOLATOR)
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.setDuration(CROSS_FADE_DURATION_MS)
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.withStartAction(new Runnable() {
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@Override
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public void run() {
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nextLayer.setVisibility(View.VISIBLE);
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}
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});
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} else {
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nextLayer.setVisibility(View.VISIBLE);
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nextLayer.setAlpha(1);
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}
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mSmaller.setEnabled(index > 0);
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mLarger.setEnabled(index < mEntries.length - 1);
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mCurrentIndex = index;
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}
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/**
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* Persists the selected value and sends a configuration change.
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*/
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protected abstract void commit();
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}
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