sdascrollbox.java

很好的UI界面源码..还有自己的输入法,可以更换风格.可以学习和使用

    }
    //对子组件重新定位
    private void setChildsPos() {
        //设置容器位置
        backPanel.left = 2;
        backPanel.top = 2;
        backPanel.width = this.getHBarWidth() - 4;
        backPanel.height = this.getVBarHeight() - 4;
        backPanel.setBackColor(backColor);
        backPanel.setTransparent(this.transparent);
        //最大信息
        getMaxInfo();
        SDABaseControl ctrl = null;
        //全部重新定位
        for (int i = 0; i < backPanel.ctrlList.size(); i++) {
            ctrl = (SDABaseControl) backPanel.ctrlList.elementAt(i);
            if (!ctrl.visible) {
                continue;
            }
            if (ctrl.dock == SDAConsts.dsNone) {
                if (!ctrl.equals(refLeftControl)) {
                    ctrl.left = (ctrl.left - refLeftControl.left) - startLeft;
                }
                if (!ctrl.equals(refTopControl)) {
                    ctrl.top = (ctrl.top - refTopControl.top) - startTop;
                }
            }
        }
        refLeftControl.left = -startLeft;
        refTopControl.top = -startTop;
    }

    public final void AddControl(SDABaseControl control) {
        backPanel.AddControl(control);
    }

    //获取最大长度和高度
    private void getMaxInfo() {
        int minLeft = Integer.MAX_VALUE;
        int minTop = Integer.MAX_VALUE;
        int maxRight = Integer.MIN_VALUE;
        int maxBottom = Integer.MIN_VALUE;
        SDABaseControl ctrl = null;
        for (int i = 0; i < backPanel.ctrlList.size(); i++) {
            ctrl = (SDABaseControl) backPanel.ctrlList.elementAt(i);
            if (!ctrl.visible) {
                continue;
            }
            if (ctrl.getLeft() < minLeft) {
                minLeft = ctrl.getLeft();
                refLeftControl = ctrl;
            }
            maxRight = ctrl.getLeft() + ctrl.getWidth() > maxRight ? ctrl.getLeft() + ctrl.getWidth() : maxRight;
            if (ctrl.getTop() < minTop) {
                minTop = ctrl.getTop();
                refTopControl = ctrl;
            }
            maxBottom = ctrl.getTop() + ctrl.getHeight() > maxBottom ? ctrl.getTop() + ctrl.getHeight() : maxBottom;
        }
        maxHeight = maxBottom - minTop + 4;
        maxLenght = maxRight - minLeft + 4;
    }

    public int getBorderStyle() {
        return borderStyle;
    }

    public void setBorderStyle(int borderStyle) {
        this.borderStyle = borderStyle;
        internalPaint();
    }
    public int getScrollBars() {
        return scrollBars;
    }

    public void setScrollBars(int scrollBars) {
        this.scrollBars = scrollBars;
        internalPaint();
    }

    public int getScrollBarWidth() {
        return barwidth;
    }

    public void setScrollBarWidth(int barwidth) {
        this.barwidth = barwidth;
        internalPaint();
    }

    public int getBorderColor() {
        return borderColor;
    }

    public void setBorderColor(int borderColor) {
        this.borderColor = borderColor;
        internalPaint();
    }

    public int getScrollBarColor() {
        return scrollBarColor;
    }

    public void setScrollBarColor(int scrollBarColor) {
        this.scrollBarColor = scrollBarColor;
        internalPaint();
    }

    private int getHBarWidth() {
        int swidth = 0;
        if ((scrollBars == SDAConsts.srHorizontal) || (scrollBars == SDAConsts.srNone)) {
            swidth = getWidth();
        }
        if ((scrollBars == SDAConsts.srBoth) || (scrollBars == SDAConsts.srVertical)) {
            swidth = getWidth() - barwidth;
        }
        return swidth;
    }

    private int getVBarHeight() {
        int sheight = 0;
        if ((scrollBars == SDAConsts.srVertical) || (scrollBars == SDAConsts.srNone)) {
            sheight = getHeight();
        }
        if ((scrollBars == SDAConsts.srBoth) || (scrollBars == SDAConsts.srHorizontal)) {
            sheight = getHeight() - barwidth;
        }
        return sheight;
    }

    //处理事件的执行
    //点箭头滚动内容
    protected void doPointerPressed(int x, int y) {
        int posx = screenXToClient(x);
        int posy = screenYToClient(y);
        int thisWidth = getWidth();
        int thisHeight = getHeight();
        int VBarHeight = getVBarHeight();
        int HBarWidth = getHBarWidth();
        //确定点击了滚动条区域
        if ((scrollBars == SDAConsts.srHorizontal) || (scrollBars == SDAConsts.srBoth)) {
            //判断是否点击了左箭头
            if (InClientRect(posx, posy, 0, thisHeight - barwidth, barwidth, barwidth)) {
                //向右滚动
                if (startLeft > 0) {
                    int step = getFont().charWidth('x');
                    startLeft -= step;
                    if (startLeft < 0) {
                        startLeft = 0;
                    }
                }
            } else //右箭头
            if (InClientRect(posx, posy, HBarWidth - barwidth, thisHeight - barwidth, barwidth, barwidth)) {
                //向左滚动
                if (maxLenght - startLeft > HBarWidth) {
                    int step = getFont().charWidth('x');
                    startLeft += step;
                }
            } else //滚动条
            if (InClientRect(posx, posy, HSLeft, HSTop, HSWidth, HSHeight)) {
                //记录点击的滚动条位置
                oldScrollPointx = posx;
                oldScrollPointy = posy;
                isscrollbarpointdown = true;
                scrollbardownHV = 0;
                oldStartLeft = startLeft;
            } else {
                if (InClientRect(posx, posy, 0, thisHeight - barwidth, HBarWidth, barwidth)) {
                    //点了空白的，滚动到点击的位置
                    //计算滚动块要到位置
                    int tpos = posx > HSLeft ? (posx - HSWidth) : (posx);
                    //计算StartLeft
                    startLeft = ((tpos - barwidth) * (maxLenght)) / (HBarWidth - 2 * barwidth);
                }
            }
        }

        if ((scrollBars == SDAConsts.srVertical) || (scrollBars == SDAConsts.srBoth)) {

            //只有垂直滚动条
            //判断是否点击了上箭头
            if (InClientRect(posx, posy, thisWidth - barwidth, 0, barwidth, barwidth)) {
                //向下滚动
                if (startTop > 0) {
                    startTop--;
                }
            } else //下箭头
            if (InClientRect(posx, posy, thisWidth - barwidth, VBarHeight - barwidth, barwidth, barwidth)) {
                //向上滚动
                startTop = (maxHeight - startTop > VBarHeight) ? startTop + 1 : startTop;
            } else //滚动条
            if (InClientRect(posx, posy, VSLeft, VSTop, VSWidth, VSHeight)) {
                //记录位置
                oldScrollPointx = posx;
                oldScrollPointy = posy;
                isscrollbarpointdown = true;
                scrollbardownHV = 1;
                oldStartLine = startTop;
            } else {
                if (InClientRect(posx, posy, thisWidth - barwidth, 0, barwidth, VBarHeight)) {
                    //空白的
                    //计算滚动块要到位置
                    int tpos = posy > VSTop ? (posy - VSHeight) : (posy);
                    //计算StartLine
                    int oldline = startTop;
                    startTop = ((tpos - barwidth) * maxHeight) / (VBarHeight - 2 * barwidth);
                    if (oldline == startTop) {
                        startTop = posy > VSTop ? startTop + 1 : startTop - 1;
                    }
                }

            }
        }
    }
    //拖动事件处理
    protected void doPointerReleased(int x, int y) {
        int posx = screenXToClient(x);
        int posy = screenYToClient(y);
        int VBarHeight = getVBarHeight();
        int HBarWidth = getHBarWidth();
        //根据点击的位置,判断滚动的多少
        if ((scrollBars == SDAConsts.srHorizontal) || ((scrollBars == SDAConsts.srBoth) && (scrollbardownHV == 0))) {
            if (isscrollbarpointdown) {
                int stepx = posx - oldScrollPointx;
                //根据滚动多少来重新定位
                //计算滚动块要到位置
                int tpos = HSLeft + stepx;
                HSLeft = tpos < barwidth ? barwidth : tpos;
                HSLeft = HSLeft + HSWidth > HBarWidth - barwidth ? HBarWidth - barwidth - HSWidth : HSLeft;
                //计算StartLeft
                startLeft = ((HSLeft - barwidth) * (maxLenght)) / (HBarWidth - 2 * barwidth);
                if (oldStartLeft != startLeft) {
                    oldScrollPointx = posx;
                    oldStartLeft = startLeft;
                } else {
                    oldStartLeft = startLeft;
                    if (stepx > 0) {
                        startLeft = maxLenght - startLeft < getHBarWidth() ? startLeft + 1 : startLeft;
                    }
                    if (stepx < 0) {
                        startLeft = startLeft == 0 ? 0 : startLeft - 1;
                    }
                }
            }
        }
        if ((scrollBars == SDAConsts.srVertical) || ((scrollBars == SDAConsts.srBoth) && (scrollbardownHV == 1))) {
            if (isscrollbarpointdown) {
                int stepy = posy - oldScrollPointy;
                //根据滚动多少来重新定位
                //计算滚动块要到位置
                int tpos = VSTop + stepy;
                VSTop = tpos < barwidth ? barwidth : tpos;
                VSTop = VSTop + VSHeight > VBarHeight - barwidth ? VBarHeight - barwidth - VSHeight : VSTop;
                //计算StartLine
                startTop = ((VSTop - barwidth) * (maxHeight * getFont().getHeight())) / (VBarHeight - 2 * barwidth) / getFont().getHeight();
                if (oldStartLine == startTop) {
                    if (stepy > 0) {
                        startTop = ((maxHeight - startTop) * getFont().getHeight() > getVBarHeight()) ? startTop + 1 : startTop;
                    }
                    if (stepy < 0) {
                        startTop = startTop > 0 ? startTop - 1 : startTop;
                    }
                    oldStartLine = startTop;
                } else {
                    if ((stepy > 0) && (startTop < oldStartLine)) {
                        startTop = oldStartLine;
                    }
                    oldStartLine = startTop;
                }
            }
        }
        isscrollbarpointdown = false;
    }    
}