自定义组合控件之滑动item+删除

来源：互联网发布：ipad钢琴软件编辑：程序博客网时间：2024/06/05 15:51
package com.hqzn.view;import android.content.Context;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.widget.FrameLayout;import android.widget.ScrollView;import android.widget.Scroller;import android.widget.TextView;/** * Created by Administrator on 2016/9/27. */public class SidingItem extends FrameLayout{    private View view;    private TextView tv;    private int viewWidth;    private int tvWidth;    private int hight;    private Scroller scroller;    public SidingItem(Context context, AttributeSet attrs) {        super(context, attrs);        scroller=new Scroller(context);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        viewWidth=view.getMeasuredWidth();        tvWidth=tv.getMeasuredWidth();        hight=getHeight();    }    @Override    protected void onLayout(boolean b, int i, int i1, int i2, int i3) {        tv.layout(0,0,tvWidth,hight);        view.layout(tvWidth,0,viewWidth+tvWidth,hight);    }    @Override    protected void onFinishInflate() {        super.onFinishInflate();        tv= (TextView) getChildAt(0);        view=getChildAt(1);    }    int lastx;    @Override    public boolean onTouchEvent(MotionEvent event) {       super.onTouchEvent(event);        int eventx= (int) event.getRawX();        switch (event.getAction()){            case MotionEvent.ACTION_DOWN:             lastx= eventx;                break;            case MotionEvent.ACTION_MOVE:                int disx=eventx-lastx;                int toScrollX = getScrollX() - disx;                System.out.println(toScrollX);// 屏蔽非法值                if (toScrollX < 0) {                    toScrollX = 0;                }else if(toScrollX > viewWidth){                    toScrollX = viewWidth;                }// scrollTo(toScrollX, 0);// 也可以                scrollTo(toScrollX, getScrollY());// 重新付值                lastx = eventx;                break;            case MotionEvent.ACTION_UP:                int totallScrollX = getScrollX();                if(totallScrollX < viewWidth/2){                    System.out.println("totallScrollX < menuWidth/2");                    closeMenu();                }else{                    System.out.println("totallScrollX >= menuWidth/2");                    openMenu();                }                break;        }        return true;    }    private void closeMenu() {        scroller.startScroll(getScrollX(),getScrollY(),0-getScrollX(),getScrollY());        invalidate();// 会导致 执行 computeScroll    }    private void openMenu(){        scroller.startScroll(getScrollX(),getScrollY(),viewWidth-getScrollX(),getScrollY());        invalidate();// 会导致 执行 computeScroll    }    @Override    public void computeScroll() {        super.computeScroll();        if (scroller.computeScrollOffset()) {            scrollTo(scroller.getCurrX(), scroller.getCurrY());            System.out.println("滚动完成");            invalidate();// 强制重绘制        }    }}
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