MouseEvent.BUTTON1的值为什么会是0

Question

最近在做一个项目,要求鼠标左键拖动,可以把图片移动,但是为什么我的左键拖动一直是0.
以下是部分代码:
public void mouseDragged(MouseEvent e) {
        this.setCursor(handCursor);
        int moveX, moveY;
        double tempX, tempY, tempSlope;
        moveX = e.getX();
        moveY = e.getY();
        if (select >= 0) {
//            tempX = Math.abs(pointsList.get(select).x + (moveX - x) - width / 2.00);
//            tempY = Math.abs(pointsList.get(select).y + (moveY - y) - width / 2.00);
//            tempSlope = Math.sqrt(Math.pow(tempX, 2.0) + Math.pow(tempY, 2.0));
            tempX = pointsList.get(select).x + (moveX - x) - width / 2.00;
            tempY = pointsList.get(select).y + (moveY - y) - width / 2.00;
            tempSlope = Math.hypot(tempX, tempY);
            int mask = e.getButton();
            if (getCursor() == handCursor && (mask & MouseEvent.BUTTON1)!=0) {
//            if (getCursor() == handCursor && e.getButton()==MouseEvent.BUTTON1) {
                if (width / 2.00 - tempSlope > radiusList.get(select)) {
                    setList(moveX - x, moveY - y);
                } else {
                    adjustPoint(pointsList.get(select).x + (moveX - x),
                            pointsList.get(select).y + (moveY - y), radiusList.get(select));
//                    setList1(roundx, roundy);
                    setList1(roundx, roundy);
                }                x = moveX;
                y = moveY;
//                repaint();
            } else if (getCursor() == handCursor && e.isShiftDown()) {
                if (width / 2.00 - tempSlope > radiusList.get(select)) {
                    setList(moveX - x, moveY - y);
                    del = false;
//                repaint();
                } else {
                    setList1(moveX, moveY);
                    del = true;
//                    removeItem(select);
//                    repaint();
                }
                x = moveX;
                y = moveY;
                del=false;
            }            repaint();
        }
    }

Answer 1

此回复为自动发出,仅用于显示而已，并无任何其他特殊作用
楼主【hujie_5592427】截止到2008-08-01 14:44:41的历史汇总数据(不包括此帖)：
发帖的总数量:5                        发帖的总分数:25                       每贴平均分数:5                        
回帖的总数量:3                        得分贴总数量:0                        回帖的得分率:0%                       
结贴的总数量:0                        结贴的总分数:0                        
无满意结贴数:0                        无满意结贴分:0                        
未结的帖子数:5                        未结的总分数:25                       
结贴的百分比:0.00  %               结分的百分比:0.00  %                  
无满意结贴率:---------------------无满意结分率:---------------------
如何结贴请参考这里：http://topic.csdn.net/u/20080501/09/ef7ba1b3-6466-49f6-9d92-36fe6d471dd1.html
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