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/*
* Copyright (C) 2016 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.widget;
import android.content.Context;
import android.content.res.Configuration;
import android.graphics.Rect;
import android.os.Bundle;
import android.support.v4.view.ViewCompat;
import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat;
import android.support.v4.widget.ExploreByTouchHelper;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.accessibility.AccessibilityEvent;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.SeekBar;
import java.util.List;
/**
* LabeledSeekBar represent a seek bar assigned with labeled, discrete values.
* It pretends to be a group of radio button for AccessibilityServices, in order to adjust the
* behavior of these services to keep the mental model of the visual discrete SeekBar.
*/
public class LabeledSeekBar extends SeekBar {
private final ExploreByTouchHelper mAccessHelper;
/** Seek bar change listener set via public method. */
private OnSeekBarChangeListener mOnSeekBarChangeListener;
/** Labels for discrete progress values. */
private String[] mLabels;
public LabeledSeekBar(Context context, AttributeSet attrs) {
this(context, attrs, com.android.internal.R.attr.seekBarStyle);
}
public LabeledSeekBar(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public LabeledSeekBar(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
mAccessHelper = new LabeledSeekBarExploreByTouchHelper(this);
ViewCompat.setAccessibilityDelegate(this, mAccessHelper);
super.setOnSeekBarChangeListener(mProxySeekBarListener);
}
@Override
public synchronized void setProgress(int progress) {
// This method gets called from the constructor, so mAccessHelper may
// not have been assigned yet.
if (mAccessHelper != null) {
mAccessHelper.invalidateRoot();
}
super.setProgress(progress);
}
public void setLabels(String[] labels) {
mLabels = labels;
}
@Override
public void setOnSeekBarChangeListener(OnSeekBarChangeListener l) {
// The callback set in the constructor will proxy calls to this
// listener.
mOnSeekBarChangeListener = l;
}
@Override
protected boolean dispatchHoverEvent(MotionEvent event) {
return mAccessHelper.dispatchHoverEvent(event) || super.dispatchHoverEvent(event);
}
private void sendClickEventForAccessibility(int progress) {
mAccessHelper.invalidateRoot();
mAccessHelper.sendEventForVirtualView(progress, AccessibilityEvent.TYPE_VIEW_CLICKED);
}
private final OnSeekBarChangeListener mProxySeekBarListener = new OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
if (mOnSeekBarChangeListener != null) {
mOnSeekBarChangeListener.onStopTrackingTouch(seekBar);
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
if (mOnSeekBarChangeListener != null) {
mOnSeekBarChangeListener.onStartTrackingTouch(seekBar);
}
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if (mOnSeekBarChangeListener != null) {
mOnSeekBarChangeListener.onProgressChanged(seekBar, progress, fromUser);
sendClickEventForAccessibility(progress);
}
}
};
private class LabeledSeekBarExploreByTouchHelper extends ExploreByTouchHelper {
private boolean mIsLayoutRtl;
public LabeledSeekBarExploreByTouchHelper(LabeledSeekBar forView) {
super(forView);
mIsLayoutRtl = forView.getResources().getConfiguration()
.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL;
}
@Override
protected int getVirtualViewAt(float x, float y) {
return getVirtualViewIdIndexFromX(x);
}
@Override
protected void getVisibleVirtualViews(List<Integer> list) {
for (int i = 0, c = LabeledSeekBar.this.getMax(); i <= c; ++i) {
list.add(i);
}
}
@Override
protected boolean onPerformActionForVirtualView(int virtualViewId, int action,
Bundle arguments) {
if (virtualViewId == ExploreByTouchHelper.HOST_ID) {
// Do nothing
return false;
}
switch (action) {
case AccessibilityNodeInfoCompat.ACTION_CLICK:
LabeledSeekBar.this.setProgress(virtualViewId);
sendEventForVirtualView(virtualViewId, AccessibilityEvent.TYPE_VIEW_CLICKED);
return true;
default:
return false;
}
}
@Override
protected void onPopulateNodeForVirtualView(
int virtualViewId, AccessibilityNodeInfoCompat node) {
node.setClassName(RadioButton.class.getName());
node.setBoundsInParent(getBoundsInParentFromVirtualViewId(virtualViewId));
node.addAction(AccessibilityNodeInfoCompat.ACTION_CLICK);
node.setContentDescription(mLabels[virtualViewId]);
node.setClickable(true);
node.setCheckable(true);
node.setChecked(virtualViewId == LabeledSeekBar.this.getProgress());
}
@Override
protected void onPopulateEventForVirtualView(int virtualViewId, AccessibilityEvent event) {
event.setClassName(RadioButton.class.getName());
event.setContentDescription(mLabels[virtualViewId]);
event.setChecked(virtualViewId == LabeledSeekBar.this.getProgress());
}
@Override
protected void onPopulateNodeForHost(AccessibilityNodeInfoCompat node) {
node.setClassName(RadioGroup.class.getName());
}
@Override
protected void onPopulateEventForHost(AccessibilityEvent event) {
event.setClassName(RadioGroup.class.getName());
}
private int getHalfVirtualViewWidth() {
final int width = LabeledSeekBar.this.getWidth();
final int barWidth = width - LabeledSeekBar.this.getPaddingStart()
- LabeledSeekBar.this.getPaddingEnd();
return Math.max(0, barWidth / (LabeledSeekBar.this.getMax() * 2));
}
private int getVirtualViewIdIndexFromX(float x) {
int posBase = Math.max(0,
((int) x - LabeledSeekBar.this.getPaddingStart()) / getHalfVirtualViewWidth());
posBase = (posBase + 1) / 2;
return mIsLayoutRtl ? LabeledSeekBar.this.getMax() - posBase : posBase;
}
private Rect getBoundsInParentFromVirtualViewId(int virtualViewId) {
final int updatedVirtualViewId = mIsLayoutRtl
? LabeledSeekBar.this.getMax() - virtualViewId : virtualViewId;
int left = (updatedVirtualViewId * 2 - 1) * getHalfVirtualViewWidth()
+ LabeledSeekBar.this.getPaddingStart();
int right = (updatedVirtualViewId * 2 + 1) * getHalfVirtualViewWidth()
+ LabeledSeekBar.this.getPaddingStart();
// Edge case
left = updatedVirtualViewId == 0 ? 0 : left;
right = updatedVirtualViewId == LabeledSeekBar.this.getMax()
? LabeledSeekBar.this.getWidth() : right;
final Rect r = new Rect();
r.set(left, 0, right, LabeledSeekBar.this.getHeight());
return r;
}
}
}