Android Open Source - Kite Layout Extension

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Back to project page Kite.

License

The source code is released under:

Apache License

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Java Source Code

/**
 * /*from   w  w w.  j  a  v  a  2  s .  c  om*/
 */
package com.efurture.kite.layout;

import java.util.Map;

import org.json.JSONException;
import org.json.JSONObject;

import android.text.TextUtils;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.view.ViewTreeObserver.OnPreDrawListener;

import com.efurture.kite.OnFinishLayoutListener;
import com.efurture.kite.expression.EvaluatorManager;
import com.efurture.kite.param.ParamMap;
import com.efurture.kite.param.Params;

/**
 * @author gubaojian   email: gubaojian@163.com
 *  */
public class LayoutExtension {
  /**
   *  layout v with json data, when layout finished call listener
   *  @param  v   target v
   *  @param data  json format data
   *  @param finishLayoutListener  listener
   * */
  public static void layout(final View v, Object data, final OnFinishLayoutListener finishLayoutListener){
    if (data == null) {
      return;
    }
    String json = data.toString().trim();
    if (TextUtils.isEmpty(json)) {
      return;
    }
    
    if(!(json.startsWith("{") && json.endsWith("}"))){
      return;
    }
    try {
      final JSONObject jsonObject = new JSONObject(json);
      v.getViewTreeObserver().addOnPreDrawListener(new OnPreDrawListener() {
        @Override
        public boolean onPreDraw() {
           LayoutParams layoutParams = v.getLayoutParams();
             if (layoutParams == null) {
             return true;
           }
           v.getViewTreeObserver().removeOnPreDrawListener(this);
             Map<String, Object> paramsMap  = ParamMap.from(v);
             paramsMap.put(Params.HEIGHT,  v.getHeight());
             paramsMap.put(Params.WIDTH,   v.getWidth());
          
           boolean updateLayoutParams = false;
           String heightExpression = jsonObject.optString(Params.HEIGHT, null);
           if (!TextUtils.isEmpty(heightExpression)) {
            layoutParams.height = EvaluatorManager.getDefaultEvaluator().eval(heightExpression, paramsMap);
            updateLayoutParams = true;
           }
           
           String widthExpression = jsonObject.optString(Params.WIDTH, null);
           if (!TextUtils.isEmpty(widthExpression)) {
             layoutParams.width = EvaluatorManager.getDefaultEvaluator().eval(widthExpression, paramsMap);
               updateLayoutParams = true;
          }
          if (updateLayoutParams) {
             v.setLayoutParams(layoutParams);
          }
            if (finishLayoutListener != null) {
            finishLayoutListener.onFinishLayout(v, jsonObject);
          }
          return false;
        }
      });
    }catch (JSONException e) {
      e.printStackTrace();
    }
  }
}

Java Source Code List