Implement Settings UI for Screen zoom preference
Also cleans up unnecessary 0s and moves tint to the proper place in relevant vector drawable XML files. Preview layout is still WIP pending UX input, but I wanted to get this CL in place so that we can test/demo the feature ASAP. Bug: 22450672 Change-Id: Ic3f1500006c763df99fba2d1d16782b89d6fcae1
This commit is contained in:
Alan Viverette
240
src/com/android/settings/display/DisplayDensityUtils.java
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240
src/com/android/settings/display/DisplayDensityUtils.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.display;
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import com.android.settings.R;
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import android.content.Context;
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import android.content.res.Resources;
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import android.os.AsyncTask;
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import android.os.RemoteException;
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import android.util.DisplayMetrics;
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import android.util.Log;
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import android.util.MathUtils;
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import android.view.Display;
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import android.view.IWindowManager;
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import android.view.WindowManagerGlobal;
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import java.util.Arrays;
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/**
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* Utility methods for working with display density.
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*/
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class DisplayDensityUtils {
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private static final String LOG_TAG = "DisplayDensityUtils";
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/** Minimum increment between density scales. */
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private static final float MIN_SCALE_INTERVAL = 0.09f;
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/** Minimum density scale. This is available on all devices. */
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private static final float MIN_SCALE = 0.85f;
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/** Maximum density scale. The actual scale used depends on the device. */
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private static final float MAX_SCALE = 1.50f;
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/** Summary used for "normal" scale. */
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private static final int SUMMARY_NORMAL = R.string.screen_zoom_summary_normal;
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/** Summary used for "custom" scale. */
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private static final int SUMMARY_CUSTOM = R.string.screen_zoom_summary_custom;
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/**
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* Summaries for scales smaller than "normal" in order of smallest to
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* largest.
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*/
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private static final int[] SUMMARIES_SMALLER = new int[] {
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R.string.screen_zoom_summary_small
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};
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/**
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* Summaries for scales larger than "normal" in order of smallest to
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* largest.
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*/
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private static final int[] SUMMARIES_LARGER = new int[] {
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R.string.screen_zoom_summary_large,
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R.string.screen_zoom_summary_very_large,
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R.string.screen_zoom_summary_extremely_large,
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};
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/**
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* Minimum allowed screen dimension, corresponds to resource qualifiers
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* "small" or "sw320dp". This value must be at least the minimum screen
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* size required by the CDD so that we meet developer expectations.
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*/
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private static final int MIN_DIMENSION_DP = 320;
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private final String[] mEntries;
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private final int[] mValues;
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private final int mNormalDensity;
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private final int mCurrentIndex;
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public DisplayDensityUtils(Context context) {
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final int normalDensity = DisplayDensityUtils.getNormalDisplayDensity(
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Display.DEFAULT_DISPLAY);
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if (normalDensity <= 0) {
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mEntries = null;
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mValues = null;
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mNormalDensity = 0;
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mCurrentIndex = -1;
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return;
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}
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final Resources res = context.getResources();
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final DisplayMetrics metrics = res.getDisplayMetrics();
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final int currentDensity = metrics.densityDpi;
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int currentDensityIndex = -1;
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// Compute number of "larger" and "smaller" scales for this display.
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final int minDimensionPx = Math.min(metrics.widthPixels, metrics.heightPixels);
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final int maxDensity = DisplayMetrics.DENSITY_MEDIUM * minDimensionPx / MIN_DIMENSION_DP;
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final float maxScale = Math.min(MAX_SCALE, maxDensity / (float) normalDensity);
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final float minScale = MIN_SCALE;
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final int numLarger = (int) MathUtils.constrain((maxScale - 1) / MIN_SCALE_INTERVAL,
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0, SUMMARIES_LARGER.length);
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final int numSmaller = (int) MathUtils.constrain((1 - minScale) / MIN_SCALE_INTERVAL,
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0, SUMMARIES_SMALLER.length);
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String[] entries = new String[1 + numSmaller + numLarger];
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int[] values = new int[entries.length];
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int curIndex = 0;
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if (numSmaller > 0) {
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final float interval = (1 - minScale) / numSmaller;
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for (int i = numSmaller - 1; i >= 0; i--) {
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final int density = (int) (normalDensity * (1 - (i + 1) * interval));
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if (currentDensity == density) {
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currentDensityIndex = curIndex;
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}
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entries[curIndex] = res.getString(SUMMARIES_SMALLER[i]);
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values[curIndex] = density;
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curIndex++;
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}
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}
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if (currentDensity == normalDensity) {
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currentDensityIndex = curIndex;
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}
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values[curIndex] = normalDensity;
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entries[curIndex] = res.getString(SUMMARY_NORMAL);
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curIndex++;
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if (numLarger > 0) {
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final float interval = (maxScale - 1) / numLarger;
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for (int i = 0; i < numLarger; i++) {
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final int density = (int) (normalDensity * (1 + (i + 1) * interval));
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if (currentDensity == density) {
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currentDensityIndex = curIndex;
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}
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values[curIndex] = density;
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entries[curIndex] = res.getString(SUMMARIES_LARGER[i]);
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curIndex++;
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}
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}
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final int displayIndex;
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if (currentDensityIndex >= 0) {
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displayIndex = currentDensityIndex;
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} else {
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// We don't understand the current density. Must have been set by
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// someone else. Make room for another entry...
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values = Arrays.copyOf(values, values.length + 1);
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values[curIndex] = currentDensity;
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entries = Arrays.copyOf(entries, values.length + 1);
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entries[curIndex] = res.getString(SUMMARY_CUSTOM, currentDensity);
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displayIndex = curIndex;
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}
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mNormalDensity = normalDensity;
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mCurrentIndex = displayIndex;
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mEntries = entries;
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mValues = values;
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}
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public String[] getEntries() {
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return mEntries;
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}
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public int[] getValues() {
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return mValues;
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}
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public int getCurrentIndex() {
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return mCurrentIndex;
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}
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public int getNormalDensity() {
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return mNormalDensity;
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}
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/**
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* Returns the normal (default) density for the specified display.
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*
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* @param displayId the identifier of the display
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* @return the normal density of the specified display, or {@code -1} if
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* the display does not exist or the density could not be obtained
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*/
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private static int getNormalDisplayDensity(int displayId) {
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try {
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final IWindowManager wm = WindowManagerGlobal.getWindowManagerService();
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return wm.getInitialDisplayDensity(displayId);
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} catch (RemoteException exc) {
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return -1;
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}
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}
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/**
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* Asynchronously applies display density changes to the specified display.
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*
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* @param displayId the identifier of the display to modify
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*/
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public static void clearForcedDisplayDensity(final int displayId) {
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AsyncTask.execute(new Runnable() {
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@Override
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public void run() {
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try {
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final IWindowManager wm = WindowManagerGlobal.getWindowManagerService();
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wm.clearForcedDisplayDensity(displayId);
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} catch (RemoteException exc) {
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Log.w(LOG_TAG, "Unable to clear forced display density setting");
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}
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}
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});
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}
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/**
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* Asynchronously applies display density changes to the specified display.
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*
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* @param displayId the identifier of the display to modify
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* @param density the density to force for the specified display
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*/
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public static void setForcedDisplayDensity(final int displayId, final int density) {
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AsyncTask.execute(new Runnable() {
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@Override
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public void run() {
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try {
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final IWindowManager wm = WindowManagerGlobal.getWindowManagerService();
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wm.setForcedDisplayDensity(displayId, density);
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} catch (RemoteException exc) {
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Log.w(LOG_TAG, "Unable to save forced display density setting");
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}
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}
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});
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}
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}
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