Android Open Source - adkintun-mobile-browser Custom Web View

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License

The source code is released under:
Apache License
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Java Source Code

/**
* Copyright 2013 NIC Chile Research Labs
* //from w  ww . ja v  a  2 s  . co m
* 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 cl.niclabs.adkintunmobile.browser;

import android.content.Context;
import android.graphics.PointF;
import android.util.AttributeSet;
import android.util.FloatMath;
import android.view.MotionEvent;
import android.view.View;
import android.webkit.WebView;

/**
 * Clase que implementa el zoom
 *
 */

public class CustomWebView extends WebView {
  private Context context;
    static final int NONE = 0;
    static final int DRAG = 1;
    static final int ZOOM = 2;
    int mode = NONE;

    PointF start = new PointF();
    PointF mid = new PointF();
    float oldDist = 1f;
    float scale = 0f;
    float oldscale = 0f;
    int displayHeight = 1;

  public CustomWebView(Context context) {
        super(context);
        this.context = context;
        this.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
        this.getSettings().setUseWideViewPort(true);
    }

    public CustomWebView(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
        this.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
        this.getSettings().setUseWideViewPort(true);
    }

    public CustomWebView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        this.context = context;
        this.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
        this.getSettings().setUseWideViewPort(true);
    }

  @Override
  public boolean onTouchEvent(MotionEvent ev) {
    boolean consumed = super.onTouchEvent(ev);

    if (isClickable())
      switch (ev.getAction() & MotionEvent.ACTION_MASK) {
      case MotionEvent.ACTION_DOWN:
        start.set(ev.getX(), ev.getY());
        mode = DRAG;
        break;
      case MotionEvent.ACTION_UP:
      case MotionEvent.ACTION_POINTER_UP:
        mode = NONE;
        break;
      case MotionEvent.ACTION_POINTER_DOWN:
        oldDist = spacing(ev);
        if (oldDist > 5f) {
          midPoint(mid, ev);
          mode = ZOOM;
        }
        break;
      case MotionEvent.ACTION_MOVE:
        if (mode == DRAG) {
        } else if (mode == ZOOM) {
          float newDist = spacing(ev);
          if (newDist > 5f) {
            scale = newDist / oldDist;
            if (scale > 1) {
              if (Math.abs(oldscale - scale) > 0.3) {
                zoomIn();
                oldscale = scale;
              }
            }
            System.out.println(scale);
            if (scale < 1) {
              if ((getContentHeight() * getScale() > displayHeight)) {
                zoomOut();
              }
            }
          }
        }
        //Topbar
        if((start.y - ev.getY()) < 0 && getScrollY()<=0){
          ((MainActivity)context).topBarJustShown = true;
          ((MainActivity)context).showTopBar();
          ((MainActivity)context).showNavigationButtons();  
        }
        break;
      }
    return consumed;
  }

  private float spacing(MotionEvent event) {
    float x = event.getX(0) - event.getX(1);
    float y = event.getY(0) - event.getY(1);
    return FloatMath.sqrt(x * x + y * y);
  }

  private void midPoint(PointF point, MotionEvent event) {
    float x = event.getX(0) + event.getX(1);
    float y = event.getY(0) + event.getY(1);
    point.set(x / 2, y / 2);
  }
}
Java Source Code List
