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/*
* Copyright (C) 2011 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.browser;
import android.os.SystemClock;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewConfiguration;
import android.webkit.WebView;
import com.android.browser.BrowserWebView.OnScrollChangedListener;
/**
* Helper class to manage when to show the URL bar based off of touch
* input, and when to begin the hide timer.
*/
public class UrlBarAutoShowManager implements OnTouchListener,
OnScrollChangedListener {
private static float V_TRIGGER_ANGLE = .9f;
private static long SCROLL_TIMEOUT_DURATION = 150;
private static long IGNORE_INTERVAL = 250;
private BrowserWebView mTarget;
private BaseUi mUi;
private int mSlop;
private float mStartTouchX;
private float mStartTouchY;
private boolean mIsTracking;
private boolean mHasTriggered;
private long mLastScrollTime;
private long mTriggeredTime;
private boolean mIsScrolling;
public UrlBarAutoShowManager(BaseUi ui) {
mUi = ui;
ViewConfiguration config = ViewConfiguration.get(mUi.getActivity());
mSlop = config.getScaledTouchSlop() * 2;
}
public void setTarget(BrowserWebView v) {
if (mTarget == v) return;
if (mTarget != null) {
mTarget.setOnTouchListener(null);
mTarget.setOnScrollChangedListener(null);
}
mTarget = v;
if (mTarget != null) {
mTarget.setOnTouchListener(this);
mTarget.setOnScrollChangedListener(this);
}
}
@Override
public void onScrollChanged(int l, int t, int oldl, int oldt) {
mLastScrollTime = SystemClock.uptimeMillis();
mIsScrolling = true;
if (t != 0) {
// If it is showing, extend it
if (mUi.isTitleBarShowing()) {
long remaining = mLastScrollTime - mTriggeredTime;
remaining = Math.max(BaseUi.HIDE_TITLEBAR_DELAY - remaining,
SCROLL_TIMEOUT_DURATION);
mUi.showTitleBarForDuration(remaining);
}
} else {
mUi.suggestHideTitleBar();
}
}
void stopTracking() {
if (mIsTracking) {
mIsTracking = false;
mIsScrolling = false;
if (mUi.isTitleBarShowing()) {
mUi.showTitleBarForDuration();
}
}
}
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getPointerCount() > 1) {
stopTracking();
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (!mIsTracking && event.getPointerCount() == 1) {
long sinceLastScroll =
SystemClock.uptimeMillis() - mLastScrollTime;
if (sinceLastScroll < IGNORE_INTERVAL) {
break;
}
mStartTouchY = event.getY();
mStartTouchX = event.getX();
mIsTracking = true;
mHasTriggered = false;
}
break;
case MotionEvent.ACTION_MOVE:
if (mIsTracking && !mHasTriggered) {
WebView web = (WebView) v;
float dy = event.getY() - mStartTouchY;
float ady = Math.abs(dy);
float adx = Math.abs(event.getX() - mStartTouchX);
if (ady > mSlop) {
mHasTriggered = true;
float angle = (float) Math.atan2(ady, adx);
if (dy > mSlop && angle > V_TRIGGER_ANGLE
&& !mUi.isTitleBarShowing()
&& (web.getVisibleTitleHeight() == 0
|| (!mIsScrolling && web.getScrollY() > 0))) {
mTriggeredTime = SystemClock.uptimeMillis();
mUi.showTitleBar();
}
}
}
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
stopTracking();
break;
}
return false;
}
}
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