Merge branch 'dev'

mac

2024-06-12 12d6db5780d8a2121a3bef2d58bf897b24ff552a

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package com.contrarywind.timer; 
 
import com.contrarywind.view.WheelView; 
 
import java.util.TimerTask; 
 
/** 
 * 平滑滚动的实现 
 * 
 * @author 小嵩 
 */ 
public final class SmoothScrollTimerTask extends TimerTask { 
 
    private int realTotalOffset; 
    private int realOffset; 
    private int offset; 
    private final WheelView wheelView; 
 
    public SmoothScrollTimerTask(WheelView wheelView, int offset) { 
        this.wheelView = wheelView; 
        this.offset = offset; 
        realTotalOffset = Integer.MAX_VALUE; 
        realOffset = 0; 
    } 
 
    @Override 
    public final void run() { 
        if (realTotalOffset == Integer.MAX_VALUE) { 
            realTotalOffset = offset; 
        } 
        //把要滚动的范围细分成10小份，按10小份单位来重绘 
        realOffset = (int) ((float) realTotalOffset * 0.1F); 
 
        if (realOffset == 0) { 
            if (realTotalOffset < 0) { 
                realOffset = -1; 
            } else { 
                realOffset = 1; 
            } 
        } 
 
        if (Math.abs(realTotalOffset) <= 1) { 
            wheelView.cancelFuture(); 
            wheelView.getHandler().sendEmptyMessage(MessageHandler.WHAT_ITEM_SELECTED); 
        } else { 
            wheelView.setTotalScrollY(wheelView.getTotalScrollY() + realOffset); 
 
            //这里如果不是循环模式，则点击空白位置需要回滚，不然就会出现选到－1 item的 情况 
            if (!wheelView.isLoop()) { 
                float itemHeight = wheelView.getItemHeight(); 
                float top = (float) (-wheelView.getInitPosition()) * itemHeight; 
                float bottom = (float) (wheelView.getItemsCount() - 1 - wheelView.getInitPosition()) * itemHeight; 
                if (wheelView.getTotalScrollY() <= top || wheelView.getTotalScrollY() >= bottom) { 
                    wheelView.setTotalScrollY(wheelView.getTotalScrollY() - realOffset); 
                    wheelView.cancelFuture(); 
                    wheelView.getHandler().sendEmptyMessage(MessageHandler.WHAT_ITEM_SELECTED); 
                    return; 
                } 
            } 
            wheelView.getHandler().sendEmptyMessage(MessageHandler.WHAT_INVALIDATE_LOOP_VIEW); 
            realTotalOffset = realTotalOffset - realOffset; 
        } 
    } 
}