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/*
* Copyright (C) 2014 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;
import android.app.Fragment;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.view.ViewGroup;
public class HighlightingFragment extends Fragment {
private static final String TAG = "HighlightSettingsFragment";
private static final int DELAY_HIGHLIGHT_DURATION_MILLIS = 300;
private static final String SAVE_HIGHLIGHTED_KEY = "android:view_highlighted";
private String mViewKey;
private boolean mViewHighlighted = false;
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
if (icicle != null) {
mViewHighlighted = icicle.getBoolean(SAVE_HIGHLIGHTED_KEY);
}
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putBoolean(SAVE_HIGHLIGHTED_KEY, mViewHighlighted);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
final Bundle args = getArguments();
if (args != null) {
mViewKey = args.getString(SettingsActivity.EXTRA_FRAGMENT_ARG_KEY);
highlightViewIfNeeded();
}
}
public void highlightViewIfNeeded() {
if (!mViewHighlighted &&!TextUtils.isEmpty(mViewKey)) {
highlightView(mViewKey);
}
}
private Drawable getHighlightDrawable() {
return getResources().getDrawable(R.drawable.preference_highlight);
}
private void highlightView(String key) {
final Drawable highlight = getHighlightDrawable();
// Try locating the View thru its Tag / Key
final View view = findViewForKey(getView(), key);
if (view != null ) {
view.setBackground(highlight);
getView().postDelayed(new Runnable() {
@Override
public void run() {
final int centerX = view.getWidth() / 2;
final int centerY = view.getHeight() / 2;
highlight.setHotspot(0, centerX, centerY);
highlight.clearHotspots();
}
}, DELAY_HIGHLIGHT_DURATION_MILLIS);
mViewHighlighted = true;
}
}
private View findViewForKey(View root, String key) {
if (checkTag(root, key)) {
return root;
}
if (root instanceof ViewGroup) {
final ViewGroup group = (ViewGroup) root;
final int count = group.getChildCount();
for (int n = 0; n < count; n++) {
final View child = group.getChildAt(n);
final View view = findViewForKey(child, key);
if (view != null) {
return view;
}
}
}
return null;
}
private boolean checkTag(View view, String key) {
final Object tag = view.getTag();
if (tag == null || !(tag instanceof String)) {
return false;
}
final String viewKey = (String) tag;
return (!TextUtils.isEmpty(viewKey) && viewKey.equals(key));
}
}
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