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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.calculator2;
import android.content.Context;
import android.transition.Fade;
import android.transition.Transition;
import android.transition.TransitionManager;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.accessibility.AccessibilityManager;
import android.widget.LinearLayout;
import android.widget.Toolbar;
public class CalculatorDisplay extends LinearLayout
implements AccessibilityManager.AccessibilityStateChangeListener {
/**
* The duration in milliseconds after which to hide the toolbar.
*/
private static final long AUTO_HIDE_DELAY_MILLIS = 3000L;
/**
* The duration in milliseconds to fade in/out the toolbar.
*/
private static final long FADE_DURATION = 200L;
private final Runnable mHideToolbarRunnable = new Runnable() {
@Override
public void run() {
// Remove any duplicate callbacks to hide the toolbar.
removeCallbacks(this);
// Only animate if we have been laid out at least once.
if (isLaidOut()) {
TransitionManager.beginDelayedTransition(CalculatorDisplay.this, mTransition);
}
mToolbar.setVisibility(View.INVISIBLE);
}
};
private final AccessibilityManager mAccessibilityManager;
private final GestureDetector mTapDetector;
private Toolbar mToolbar;
private Transition mTransition;
private boolean mForceToolbarVisible;
public CalculatorDisplay(Context context) {
this(context, null /* attrs */);
}
public CalculatorDisplay(Context context, AttributeSet attrs) {
this(context, attrs, 0 /* defStyleAttr */);
}
public CalculatorDisplay(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mAccessibilityManager =
(AccessibilityManager) context.getSystemService(Context.ACCESSIBILITY_SERVICE);
mTapDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onDown(MotionEvent e) {
// Remove callbacks to hide the toolbar.
removeCallbacks(mHideToolbarRunnable);
return true;
}
@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
if (mToolbar.getVisibility() != View.VISIBLE) {
showToolbar(true);
} else {
hideToolbar();
}
return true;
}
});
// Draw the children in reverse order so that the toolbar is on top.
setChildrenDrawingOrderEnabled(true);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
mToolbar = (Toolbar) findViewById(R.id.toolbar);
mTransition = new Fade()
.setDuration(FADE_DURATION)
.addTarget(mToolbar);
}
@Override
protected int getChildDrawingOrder(int childCount, int i) {
// Reverse the normal drawing order.
return (childCount - 1) - i;
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
mAccessibilityManager.addAccessibilityStateChangeListener(this);
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
mAccessibilityManager.removeAccessibilityStateChangeListener(this);
}
@Override
public void onAccessibilityStateChanged(boolean enabled) {
// Always show the toolbar whenever accessibility is enabled.
showToolbar(true);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
mTapDetector.onTouchEvent(event);
return super.onInterceptTouchEvent(event);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
return mTapDetector.onTouchEvent(event) || super.onTouchEvent(event);
}
/**
* Returns {@code true} if the toolbar should remain visible.
*/
public boolean getForceToolbarVisible() {
return mForceToolbarVisible || mAccessibilityManager.isEnabled();
}
/**
* Forces the toolbar to remain visible.
*
* @param forceToolbarVisible {@code true} to keep the toolbar visible
*/
public void setForceToolbarVisible(boolean forceToolbarVisible) {
if (mForceToolbarVisible != forceToolbarVisible) {
mForceToolbarVisible = forceToolbarVisible;
showToolbar(!forceToolbarVisible);
}
}
/**
* Shows the toolbar.
* @param autoHide Automatically ide toolbar again after delay
*/
public void showToolbar(boolean autoHide) {
// Only animate if we have been laid out at least once.
if (isLaidOut()) {
TransitionManager.beginDelayedTransition(this, mTransition);
}
mToolbar.setVisibility(View.VISIBLE);
// Remove callbacks to hide the toolbar.
removeCallbacks(mHideToolbarRunnable);
// Auto hide the toolbar after 3 seconds.
if (autoHide && !getForceToolbarVisible()) {
postDelayed(mHideToolbarRunnable, AUTO_HIDE_DELAY_MILLIS);
}
}
/**
* Hides the toolbar.
*/
public void hideToolbar() {
if (!getForceToolbarVisible()) {
removeCallbacks(mHideToolbarRunnable);
mHideToolbarRunnable.run();
}
}
public boolean isToolbarVisible() {
return mToolbar.getVisibility() == View.VISIBLE;
}
}
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