NumberPickerJava.java

package com.example.numberpicker;

import com.darwinsys.android.NumberPickerLogic;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;

/**
 * NumberClicker Makes a layout with three components, like this:
 * <pre>
 * +-------------------+ +-------------------+
 * |                   | |          +        |
 * |         3        | |-------------------|
 * |                   | |-------------------|
 * |                   | |          -        |
 * |-------------------| |-------------------|
 * </pre>
 * The + and - buttons are set to increment and decrement the number in the textfield!
 * @author Ian Darwin
 */
public class NumberPickerJava extends ViewGroup {

	private static final String TAG = "NumberPickerJava";
	EditText number;
	Button plus, minus;
	private NumberPickerLogic logic;

	public NumberPickerJava(Context context) {
		this(context, null);
		Log.d(TAG, "Losing AttributeSet");
	}
	
	public NumberPickerJava(Context context, AttributeSet attrs) {
		super(context, attrs);
		Log.d(TAG, "Constructor");

		addView(this.number = new EditText(context));
		number.setTextSize(3, 24f);
		number.setGravity(Gravity.CENTER);
		
		logic = new NumberPickerLogic(number);

		addView(this.plus = new Button(context));
		plus.setText("+");

		addView(this.minus = new Button(context));
		minus.setText("-");

		logic.setValue(1);

		this.plus.setOnClickListener(new OnClickListener() {			
			@Override
			public void onClick(View v) {
				logic.increment();
			}           
		});
		this.minus.setOnClickListener(new OnClickListener() {			
			@Override
			public void onClick(View v) {
				logic.decrement();
			}           
		});
	}


	/** 
	 * Compute sizes and positions of subfields.
	 */
	@Override
	protected void onLayout(boolean changed, int left, int top, int right, int bottom) {			

		int layoutWidth = right - left;
		int layoutHeight = bottom - top;

		int halfX = layoutWidth / 2;
		int halfY = layoutHeight / 2;

		number.layout(0 + number.getPaddingLeft(), 0 + number.getPaddingTop(), 
				halfX - number.getPaddingRight(), layoutHeight - number.getPaddingBottom());
		
		plus.layout(halfX + plus.getPaddingLeft(), 0 + plus.getPaddingTop(), 
				right - plus.getPaddingRight(), halfY - plus.getPaddingTop());

		minus.layout(halfX  + minus.getPaddingLeft(), halfY  + minus.getPaddingTop(), 
				right - minus.getPaddingRight(), layoutHeight - minus.getPaddingBottom());
		
		Log.d(TAG,"onLayout done");
	}
}