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/*
* Copyright (C) 2013 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 android.content.ContentResolver;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Point;
import android.os.Bundle;
import android.provider.Settings;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnPreparedListener;
import android.net.Uri;
import android.support.v7.preference.Preference;
import android.support.v7.preference.PreferenceScreen;
import android.support.v7.preference.PreferenceViewHolder;
import android.view.Display;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.MediaController;
import android.widget.RelativeLayout.LayoutParams;
import android.widget.VideoView;
import com.android.internal.logging.MetricsProto.MetricsEvent;
import com.android.settings.R;
import com.android.settings.widget.ToggleSwitch;
import com.android.settings.widget.ToggleSwitch.OnBeforeCheckedChangeListener;
public class ToggleScreenMagnificationPreferenceFragment extends ToggleFeaturePreferenceFragment {
protected class VideoPreference extends Preference {
private ImageView mVideoBackgroundView;
private OnGlobalLayoutListener mLayoutListener;
public VideoPreference(Context context) {
super(context);
}
@Override
public void onBindViewHolder(PreferenceViewHolder view) {
super.onBindViewHolder(view);
Resources res = getPrefContext().getResources();
final int backgroundAssetWidth = res.getDimensionPixelSize(
R.dimen.screen_magnification_video_background_width);
final int videoAssetWidth = res
.getDimensionPixelSize(R.dimen.screen_magnification_video_width);
final int videoAssetHeight = res
.getDimensionPixelSize(R.dimen.screen_magnification_video_height);
final int videoAssetMarginTop = res.getDimensionPixelSize(
R.dimen.screen_magnification_video_margin_top);
view.setDividerAllowedAbove(false);
view.setDividerAllowedBelow(false);
mVideoBackgroundView = (ImageView) view.findViewById(R.id.video_background);
final VideoView videoView = (VideoView) view.findViewById(R.id.video);
// Loop the video.
videoView.setOnPreparedListener(new OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mediaPlayer) {
mediaPlayer.setLooping(true);
}
});
videoView.setVideoURI(Uri.parse(String.format("%s://%s/%s",
ContentResolver.SCHEME_ANDROID_RESOURCE,
getPrefContext().getPackageName(),
R.raw.accessibility_screen_magnification)));
// Make sure video controls (e.g. for pausing) are not displayed.
videoView.setMediaController(null);
// LayoutListener for adjusting the position of the VideoView on the background image.
mLayoutListener = new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
final int backgroundViewWidth = mVideoBackgroundView.getWidth();
LayoutParams videoLp = (LayoutParams) videoView.getLayoutParams();
videoLp.width = videoAssetWidth * backgroundViewWidth / backgroundAssetWidth;
videoLp.height = videoAssetHeight * backgroundViewWidth / backgroundAssetWidth;
videoLp.setMargins(0,
videoAssetMarginTop * backgroundViewWidth / backgroundAssetWidth, 0, 0);
videoView.setLayoutParams(videoLp);
videoView.invalidate();
videoView.start();
}
};
mVideoBackgroundView.getViewTreeObserver().addOnGlobalLayoutListener(mLayoutListener);
}
@Override
protected void onPrepareForRemoval() {
mVideoBackgroundView.getViewTreeObserver()
.removeOnGlobalLayoutListener(mLayoutListener);
}
}
protected VideoPreference mVideoPreference;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mVideoPreference = new VideoPreference(getPrefContext());
mVideoPreference.setSelectable(false);
mVideoPreference.setPersistent(false);
mVideoPreference.setLayoutResource(R.layout.video_preference);
final PreferenceScreen preferenceScreen = getPreferenceManager().getPreferenceScreen();
preferenceScreen.setOrderingAsAdded(false);
mVideoPreference.setOrder(0);
mSummaryPreference.setOrder(1);
preferenceScreen.addPreference(mVideoPreference);
}
@Override
protected void onPreferenceToggled(String preferenceKey, boolean enabled) {
// Do nothing.
}
@Override
protected void onInstallSwitchBarToggleSwitch() {
super.onInstallSwitchBarToggleSwitch();
mToggleSwitch.setOnBeforeCheckedChangeListener(new OnBeforeCheckedChangeListener() {
@Override
public boolean onBeforeCheckedChanged(ToggleSwitch toggleSwitch, boolean checked) {
mSwitchBar.setCheckedInternal(checked);
getArguments().putBoolean(AccessibilitySettings.EXTRA_CHECKED, checked);
onPreferenceToggled(mPreferenceKey, checked);
return false;
}
});
}
@Override
public void onResume() {
super.onResume();
// Temporarily enable Magnification on this screen if it's disabled.
if (Settings.Secure.getInt(getContentResolver(),
Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_ENABLED, 0) == 0) {
setMagnificationEnabled(1);
}
VideoView videoView = (VideoView) getView().findViewById(R.id.video);
if (videoView != null) {
videoView.start();
}
}
@Override
public void onPause() {
super.onPause();
if (!mToggleSwitch.isChecked()) {
setMagnificationEnabled(0);
}
}
private void setMagnificationEnabled(int enabled) {
Settings.Secure.putInt(getContentResolver(),
Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_ENABLED, enabled);
}
@Override
public int getMetricsCategory() {
return MetricsEvent.ACCESSIBILITY_TOGGLE_SCREEN_MAGNIFICATION;
}
private static int getScreenWidth(Context context) {
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
Point size = new Point();
display.getSize(size);
return size.x;
}
}
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