Android Open Source - comicsapp Comics Web View

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Back to project page comicsapp.

License

The source code is released under:

GNU General Public License

Java Source Code

/* Copyright 2012-2014, Robert Myers */
/*  w ww  .java 2  s  .com*/
/*
 * This file is part of ComicsApp.

    ComicsApp is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Comics is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with ComicsApp.  If not, see <http://www.gnu.org/licenses/>
 */

package com.robandjen.comicsapp;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.preference.PreferenceManager;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.webkit.WebView;

public class ComicsWebView extends WebView implements OnSharedPreferenceChangeListener {

  GestureDetector mGestureDetect;
  ComicsEvents mEvents;
  static final float MAXTHRESHOLDY = 500f;
  static final float MINTHRESHOLDX = 1500f;
  static final String GESTUREPREF = "pref_usegestures";
  static final String TAPPREF = "pref_usetap";
  boolean mGesturesEnabled;
  boolean mTapEnabled;
  
  //This assumes the view is the width of the screen
  boolean handleTap(MotionEvent e) {
    boolean rc = false;
    if (!mTapEnabled) {
      return false;
    }
    
    if (mEvents != null) {
      
      //Allow links and such in the hit region
      WebView.HitTestResult htr = getHitTestResult();
      if (htr.getType() != WebView.HitTestResult.UNKNOWN_TYPE 
          && htr.getType() != WebView.HitTestResult.IMAGE_TYPE) {
        return false;
      }
      
      //Tap in 1/CLICKRANGEth of edge causes next/previous
      final int CLICKRANGE = 10;
      final int width = getWidth();
      final int prevrange = width / CLICKRANGE;
      final int nextrange = width - prevrange;
      
      final int xpos = (int) e.getX();
      if (xpos <= prevrange) {
        mEvents.onPreviousComic(this);
        rc = true;
      } else if (xpos >= nextrange) {
        mEvents.onNextComic(this);
        rc = true;
      }
    }
    return rc;
  }
  
  void onActivityPause() {
    SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getContext().getApplicationContext());
    pref.unregisterOnSharedPreferenceChangeListener(this);
  }
  
  void onActivityResume() {
    SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getContext().getApplicationContext());
    pref.registerOnSharedPreferenceChangeListener(this);
    mGesturesEnabled = pref.getBoolean(GESTUREPREF, false);
    mTapEnabled = pref.getBoolean(TAPPREF, true);
  }
  
  public void setListener(ComicsEvents listener) {
    mEvents = listener;
  }
  private void initDetector() {
    mGestureDetect = new GestureDetector(getContext(), new GestureDetector.SimpleOnGestureListener() {
      @Override
      public boolean onFling(MotionEvent e1,MotionEvent e2,float velocityX,float velocityY) {
        boolean rc = false;
        if (!mGesturesEnabled) {
          return false;
        }
        
        if (mEvents != null) {
          if (Math.abs(velocityY) < Math.abs(velocityX) && Math.abs(velocityX) > MINTHRESHOLDX) {
            if (velocityX < 0) {
              mEvents.onNextComic(ComicsWebView.this);
            }
            else {
              mEvents.onPreviousComic(ComicsWebView.this);
            }
            rc = true;
          }
        }
        return rc;
      }
      
      @Override
      public boolean onSingleTapUp(MotionEvent e) {
        return handleTap(e);
      }
    }
    );
  }
  
  public ComicsWebView(Context context) {
    super(context);
    initDetector();
  }

  public ComicsWebView(Context context, AttributeSet attrs) {
    super(context, attrs);
    initDetector();
  }

  public ComicsWebView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    initDetector();
  }
  
  @Override
  public boolean onTouchEvent(MotionEvent event) {
    boolean superrc = super.onTouchEvent(event);
    boolean gesturerc = mGestureDetect.onTouchEvent(event);
    
    return superrc || gesturerc;
  }
  @Override
  public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
    if (key.equals(GESTUREPREF)) {
      mGesturesEnabled = sharedPreferences.getBoolean(key, false);
    }
    else if (key.equals(TAPPREF)) {
      mTapEnabled = sharedPreferences.getBoolean(key, true);
    }
    
  }

}

Java Source Code List

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