sdalistbox.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

    public void setSelectedForeColor(int selectedForeColor) {
        this.selectedForeColor = selectedForeColor;
        repaintControl();
    }

    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;
    }

    public int getItemIndex() {
        return itemIndex;
    }

    public int getItemIndex(String itemValue) {
        return internalGetItemIndex(itemValue);
    }

    private int internalGetItemIndex(String itemValue) {
        SDAListItem item = null;
        int result = -1;
        for (int i = 0; i < itemList.size(); i++) {
            item = (SDAListItem) itemList.elementAt(i);
            if (item.getItemString().equals(itemValue)) {
                result = i;
                break;
            }
        }
        return result;
    }

    public void setItemIndex(int itemIndex) {
        this.itemIndex = itemIndex;
        internalPaint();
    }
    //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();
        int fontHeight = getFont().getHeight();
        maxLineLenght = getMaxLineLenght();
        //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 (maxLineLenght - 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) * (maxLineLenght)) / (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 (startLine > 0) {
                    startLine--;
                }
            } else //下箭头
            if (InClientRect(posx, posy, thisWidth - barwidth, VBarHeight - barwidth, barwidth, barwidth)) {
                //向上滚动
                startLine = ((itemList.size() - startLine) * fontHeight > VBarHeight) ? startLine + 1 : startLine;
            } 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 = startLine;
            } 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 = startLine;
                    startLine = ((tpos - barwidth) * (itemList.size() * fontHeight)) / (VBarHeight - 2 * barwidth) / fontHeight;
                    if (oldline == startLine) {
                        startLine = posy > VSTop ? startLine + 1 : startLine - 1;
                    }
                }

            }
        }
        //点了滚动条外       
        if (InClientRect(posx, posy, 0, 0, HBarWidth, VBarHeight)) {
            itemIndex = posy / fontHeight + startLine;
            if (itemIndex > itemList.size() - 1) {
                itemIndex = itemList.size() - 1;
            //处理选择
            }
            if (InClientRect(posx, posy, 2, 2 + fontHeight * (itemIndex - startLine), fontHeight, fontHeight)) {
                setItemChecked(itemIndex, !getItemChecked(itemIndex));
            }
        }

    }
    //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) * (maxLineLenght)) / (HBarWidth - 2 * barwidth);
                if (oldStartLeft != startLeft) {
                    oldScrollPointx = posx;
                    oldStartLeft = startLeft;
                } else {
                    oldStartLeft = startLeft;
                    if (stepx > 0) {
                        startLeft = maxLineLenght - 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
                startLine = ((VSTop - barwidth) * (itemList.size() * getFont().getHeight())) / (VBarHeight - 2 * barwidth) / getFont().getHeight();
                if (oldStartLine == startLine) {
                    if (stepy > 0) {
                        startLine = ((itemList.size() - startLine) * getFont().getHeight() > getVBarHeight()) ? startLine + 1 : startLine;
                    }
                    if (stepy < 0) {
                        startLine = startLine > 0 ? startLine - 1 : startLine;
                    }
                    oldStartLine = startLine;
                } else {
                    if ((stepy > 0) && (startLine < oldStartLine)) {
                        startLine = oldStartLine;
                    }
                    oldStartLine = startLine;
                }
            }
        }
        isscrollbarpointdown = false;
    }
    //键盘事件处理
    protected void doKeyUp(int keyCode) {
        maxLineLenght = getMaxLineLenght();
        maxVisibleLineNum = getmaxVisibleLineNum();
        String key = form.getKeyName(keyCode).toUpperCase();
        if (key.equals(SDAConsts.KEY_UP)) {
            if (itemIndex > startLine) {
                itemIndex--;
                repaintControl();
                return;
            }
            //上
            if (startLine > 0) {
                startLine--;
                itemIndex = startLine;
            }
        }
        if (key.equals(SDAConsts.KEY_DOWN)) {
            if (itemIndex < startLine + maxVisibleLineNum - 1) {
                itemIndex++;
                repaintControl();
                return;
            }
            //下
            startLine = ((itemList.size() - startLine) * getFont().getHeight() > getVBarHeight()) ? startLine + 1 : startLine;
            itemIndex = startLine + maxVisibleLineNum - 1;
        }
        if (itemIndex < startLine) {
            itemIndex = startLine;
        }
        if (itemIndex > startLine + maxVisibleLineNum) {
            itemIndex = startLine + maxVisibleLineNum;
        }
        if (key.equals(SDAConsts.KEY_LEFT)) {
            //左
            if (startLeft > 0) {
                int step = getFont().charWidth('x');
                startLeft -= step;
                if (startLeft < 0) {
                    startLeft = 0;
                }
            }
        }
        if (key.equals(SDAConsts.KEY_RIGHT)) {
            //右
            if (maxLineLenght - startLeft > getHBarWidth()) {
                int step = getFont().charWidth('x');
                startLeft += step;
            }
        }
        if(key.equals(SDAConsts.KEY_SELECT)||key.equals(SDAConsts.KEY_ENTER)){
            setItemChecked(itemIndex, !getItemChecked(itemIndex));
        }
        repaintControl();
    }

    protected boolean canDownTabNext() {
        boolean result = false;
        if (itemIndex == itemList.size() - 1) {
            result = true;
        }
        return result;
    }

    protected boolean canLeftTabPrior() {
        boolean result = false;
        if (scrollBars == SDAConsts.srHorizontal || scrollBars == SDAConsts.srBoth) {
            if (startLeft > 0) {
                result = false;
            } else {
                result = true;
            }
        } else {
            if (itemIndex == 0 || itemIndex == -1) {
                result = true;
            }
        }
        return result;
    }

    protected boolean canRightTabNext() {
        boolean result = false;
        if (scrollBars == SDAConsts.srHorizontal || scrollBars == SDAConsts.srBoth) {
            if (maxLineLenght - startLeft > getHBarWidth()) {
                result = false;
            } else {
                result = true;
            }
        } else {
            if (itemIndex == itemList.size() - 1) {
                result = true;
            }
        }
        return result;
    }

    protected boolean canUpTabPrior() {
        boolean result = false;
        if (itemIndex == 0 || itemIndex == -1) {
            result = true;
        }
        return result;
    }
}