AbsoluteLayoutSfeir.java :  » Contact » fastcall-android » com » sfeir » fastcall » layout » Android Open Source

package com.sfeir.fastcall.layout;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RemoteViews.RemoteView;

import com.sfeir.fastcall.R;

/**
 * Created by :
 * 
 *     @author SFEIR
 *
 * A layout that lets you specify exact locations (x/y coordinates) of its
 * children. Absolute layouts are less flexible and harder to maintain than
 * other types of layouts without absolute positioning.
 *
 * <p><strong>XML attributes</strong></p> <p> See {@link
 * android.R.styleable#ViewGroup ViewGroup Attributes}, {@link
 * android.R.styleable#View View Attributes}</p>
 */
@RemoteView
public class AbsoluteLayoutSfeir extends ViewGroup {
    public AbsoluteLayoutSfeir(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
  }


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


  public AbsoluteLayoutSfeir(Context context) {
    super(context);
  }



    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
      final  int count = getChildCount();

        int maxHeight = 0;
        int maxWidth = 0;

        // Find out how big everyone wants to be
        measureChildren(widthMeasureSpec, heightMeasureSpec);

        // Find rightmost and bottom-most child
        for (int i = 0; i < count; i++) {
            View child = getChildAt(i);
            if (child.getVisibility() != GONE) {
                int childRight;
                int childBottom;
                
                AbsoluteLayoutSfeir.LayoutParams lp = (AbsoluteLayoutSfeir.LayoutParams) child.getLayoutParams();

                childRight = lp.x + child.getMeasuredWidth();
                childBottom = lp.y + child.getMeasuredHeight();

                maxWidth = Math.max(maxWidth, childRight);
                maxHeight = Math.max(maxHeight, childBottom);
            }
        }

        // Account for padding too
        maxWidth += getPaddingLeft() + getPaddingRight();
        maxHeight += getPaddingTop() + getPaddingBottom();

        // Check against minimum height and width
        maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight());
        maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth());
        
        setMeasuredDimension(resolveSize(maxWidth, widthMeasureSpec), resolveSize(maxHeight, heightMeasureSpec));
    }

    /**
     * Returns a set of layout parameters with a width of
     * {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT},
     * a height of {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT}
     * and with the coordinates (0, 0).
     */
    @Override
    protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
        return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 0, 0);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
      final int count = getChildCount();

        for (int i = 0; i < count; i++) {
          final View child = getChildAt(i);
            if (child.getVisibility() != GONE) {
              final  AbsoluteLayoutSfeir.LayoutParams lp = (AbsoluteLayoutSfeir.LayoutParams) child.getLayoutParams();
              final int childLeft = getPaddingLeft() + lp.x;
              final int childTop = getPaddingTop() + lp.y;
                child.layout(childLeft, childTop, childLeft + child.getMeasuredWidth(), childTop + child.getMeasuredHeight());
            }
        }
    }

    @Override
    public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
        return new AbsoluteLayoutSfeir.LayoutParams(getContext(), attrs);
    }

    // Override to allow type-checking of LayoutParams. 
    @Override
    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
        return p instanceof AbsoluteLayoutSfeir.LayoutParams;
    }

    @Override
    protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
        return new LayoutParams(p);
    }

    /**
     * Per-child layout information associated with AbsoluteLayoutSfeir.
     * See
     * {@link android.R.styleable#AbsoluteLayoutSfeir_Layout Absolute Layout Attributes}
     * for a list of all child view attributes that this class supports.
     */
    public static class LayoutParams extends ViewGroup.LayoutParams {
        /**
         * The horizontal, or X, location of the child within the view group.
         */
        public int x;
        /**
         * The vertical, or Y, location of the child within the view group.
         */
        public int y;

        /**
         * Creates a new set of layout parameters with the specified width,
         * height and location.
         *
         * @param width the width, either {@link #FILL_PARENT},
                  {@link #WRAP_CONTENT} or a fixed size in pixels
         * @param height the height, either {@link #FILL_PARENT},
                  {@link #WRAP_CONTENT} or a fixed size in pixels
         * @param x the X location of the child
         * @param y the Y location of the child
         */
        public LayoutParams(int width, int height, int x, int y) {
            super(width, height);
            this.x = x;
            this.y = y;
        }

        /**
         * Creates a new set of layout parameters. The values are extracted from
         * the supplied attributes set and context. The XML attributes mapped
         * to this set of layout parameters are:
         *
         * <ul>
         *   <li><code>layout_x</code>: the X location of the child</li>
         *   <li><code>layout_y</code>: the Y location of the child</li>
         *   <li>All the XML attributes from
         *   {@link android.view.ViewGroup.LayoutParams}</li>
         * </ul>
         *
         * @param c the application environment
         * @param attrs the set of attributes fom which to extract the layout
         *              parameters values
         */
        public LayoutParams(Context c, AttributeSet attrs) {
            super(c, attrs);
            TypedArray a = c.obtainStyledAttributes(attrs,
                R.styleable.AbsoluteLayoutSfeir);
            x = a.getDimensionPixelOffset(
                    R.styleable.AbsoluteLayoutSfeir_Layout_x, 0);
            y = a.getDimensionPixelOffset(
                R.styleable.AbsoluteLayoutSfeir_Layout_y, 0);
            a.recycle();
        }

        /**
         * {@inheritDoc}
         */
        public LayoutParams(ViewGroup.LayoutParams source) {
            super(source);
        }

    }
}