PluginScrollView.java

package com.duguang.baseanimation.ui.tab.scroll.widget;

import java.util.List;

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;

import com.duguang.baseanimation.R;
import com.duguang.baseanimation.ui.tab.scroll.widget.MyHorizontalScrollView.OnComputeScrollListener;

public class PluginScrollView extends RelativeLayout{

	private MyHorizontalScrollView scrollview;
	private LinearLayout layout;
	private ScrollIndicator indicator;
	private ViewPager viewpager;
	private int currentSelectedButton = -1;
	private int singleButtonWidth = 90;
	private Context context;
	private List<View> testList;
	
	public PluginScrollView(Context context) {
		super(context);
		this.context = context;
		init();
	}
	
	public PluginScrollView(Context context, ViewPager viewPager) {
		this(context,viewPager,null);
	}
	
	public PluginScrollView(Context context, ViewPager viewPager,List<View> testList) {
		super(context);
		this.context = context;
		this.viewpager = viewPager;
		this.testList = testList;
		init();
	}
	
	public PluginScrollView(Context context, AttributeSet attr) {
		super(context, attr);
		this.context = context;
		init();
	}
	
	private void init(){
		
			View view = View.inflate(context, R.layout.activity_tab_scrollview_plugin, this);
			scrollview = (MyHorizontalScrollView)view
					.findViewById(R.id.my_horizontal_scrollview);
			scrollview.setHorizontalScrollBarEnabled(false);
			scrollview.setOnComputeScrollListener(new OnComputeScrollListener() {				
				@Override
				public void computeScroll(View view) {
					// ���Ʒ����ͷ����ʾ���
					setIndicatorVisibility(view);
				}
			});
			layout = (LinearLayout)view.findViewById(R.id.layout);
			indicator = new ScrollIndicator(context);
			IndicatorArrowClickListener listener = new IndicatorArrowClickListener();
			indicator.setLeftArrowClickListener(listener);
			indicator.setRightArrowClickListener(listener);
	}
	
	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b) {
		// TODO Auto-generated method stub
		super.onLayout(changed, l, t, r, b);
		if(layout != null){
			View button = layout.getChildAt(0);
			if(button != null){
				singleButtonWidth = button.getWidth();
			}
		}
	}

	public void setViewPager(ViewPager viewPager){
		this.viewpager = viewPager;
	}
	
	public void setTestList(List<View> testList){
		this.testList = testList;
		initButtons();
	}
	
	public List<View> getTestList(){
		return this.testList;
	}
	
	private void initButtons(){
		if(testList == null)	return;
		currentSelectedButton = -1;
		layout.removeAllViews();
		for(int i=0;i<testList.size();i++){
			final int j = i;
			Button mbutton = new Button(context);
			mbutton.setText("Button"+i);
			mbutton.setBackgroundResource(R.drawable.btn_scrollview_plugin_unselected);
			LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
			mbutton.setLayoutParams(params);
			mbutton.setOnClickListener(new OnClickListener() {
				
				@Override
				public void onClick(View v) {
					// TODO Auto-generated method stub
					viewpager.setCurrentItem(j, true);
				}
			});
			layout.addView(mbutton);
		}
		if(testList.size() > 0){
			buttonSelected(0);
		}
		setIndicatorVisibility(scrollview);
	}
	
	public int size(){
		if(testList == null)	return 0;
		return testList.size();
	}
	
	public void buttonSelected(int position){
		if(position == currentSelectedButton){
			return ;
		}
		if(currentSelectedButton != -1){
			getButtonInLayout(currentSelectedButton).setSelected(false);
			getButtonInLayout(currentSelectedButton).setBackgroundResource(R.drawable.btn_scrollview_plugin_unselected);
		}
		getButtonInLayout(position).setSelected(true);
		getButtonInLayout(position).setBackgroundResource(R.drawable.bg_scrollview_pink);
		currentSelectedButton = position;
		autoScrollView(position);
	}
	
	private void autoScrollView(int location){
		
		int displayX = scrollview.getScrollX();	 // ��������� ���
		int displayMaxX  = getWidth() + displayX;// ����������յ�
		
		int icoScrollX = 0;
		for(int i=0;i<location;i++){
			icoScrollX += layout.getChildAt(i).getWidth();// ָ����ť�ľ���߾�ľ���
		}
		// ָ����ť�ľ���߾�ľ��� + ������
		int icoScrollMaxX = layout.getChildAt(location).getWidth() + icoScrollX;
		
		if(icoScrollX < displayX){
			// �������� ����
			scrollview.smoothScrollBy(icoScrollX - displayX - 10, 0);
		}else if(icoScrollMaxX > displayMaxX){
			// �������� ����
			scrollview.smoothScrollBy(icoScrollMaxX - displayMaxX, 0);
		}
		setIndicatorVisibility(scrollview);
		
	}
	
	private Button getButtonInLayout(int i){
		View view = layout.getChildAt(i);
		if(view instanceof Button){
			return (Button)view;
		}
		return null;
	}
	
	private void setIndicatorVisibility(View v){
		Log.d("debug", "setIndicatorVisibility  ==> v.getScrollX = "+v.getScrollX());
		
		if(v.getScrollX() <= 1){
			indicator.hideLeftArrow();
		}else{
			indicator.showLeftArrow();
		}
		int seg = layout.getWidth() - v.getScrollX() -v.getWidth();
		if(seg >= 1){
			indicator.showRightArrow();
		}else{
			indicator.hideRightArrow();
		}
	}
	

	private class IndicatorArrowClickListener implements OnClickListener{

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			switch (v.getId()) {
			case R.id.imgview_arrow_left:
				scrollview.smoothScrollBy(-singleButtonWidth, 0);
				break;

			case R.id.imgview_arrow_right:
				scrollview.smoothScrollBy(singleButtonWidth, 0);
				break;
			}
		}
	};
}