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

                    g.setColor(SDAConsts.clFocusShadow);
                    drawRect(g, 1, 1, thisWidth - 2, thisHeight - 2);
                }
            }
            if (borderStyle == SDAConsts.bsFixedSingle) {
                //边框
                g.setColor(this.getBorderColor());
                drawRect(g, 0, 0, thisWidth, thisHeight);
                if (isFoucsed()) {
                    g.setColor(SDAConsts.clFocusShadow);
                    drawRect(g, 1, 1, thisWidth - 2, thisHeight - 2);
                }
            }
            //打字
            g.setColor(this.getForeColor());
            paintString(g);
            //滚动条
            if (borderStyle == SDAConsts.bsFixed3D) {
                SetClip(g, 2, 2, thisWidth - 2, thisHeight - 2);
            } else {
                SetClip(g, 1, 1, thisWidth - 1, thisHeight - 1);
            }
            if ((scrollBars == SDAConsts.srHorizontal) || (scrollBars == SDAConsts.srBoth)) {
                //水平
                g.setColor(scrollBarColor);
                fillRect(g, 0, thisHeight - barwidth, barwidth, barwidth);
                fillRect(g, HBarWidth - barwidth, thisHeight - barwidth, barwidth, barwidth);
                g.setColor(getBorderColor());
                drawRect(g, 0, thisHeight - barwidth, barwidth, barwidth);
                drawRect(g, HBarWidth - barwidth, thisHeight - barwidth, barwidth, barwidth);
                //滚动块
                g.setColor(backColor);
                fillRect(g, barwidth, thisHeight - barwidth, HBarWidth - 2 * barwidth, barwidth);
                g.setColor(this.getBorderColor());
                drawRect(g, barwidth, thisHeight - barwidth, HBarWidth - 2 * barwidth, barwidth);
                //块大小
                int pwidth = HBarWidth - 2 * barwidth;

                if (maxLineLenght > HBarWidth) {
                    pwidth = ((HBarWidth) * (HBarWidth - 2 * barwidth)) / maxLineLenght;
                }

                //计算块位置
                int ppos = (startLeft * (HBarWidth - 2 * barwidth)) / maxLineLenght;
                //修正位置
                if (ppos + pwidth > HBarWidth - 2 * barwidth) {
                    ppos = HBarWidth - 2 * barwidth - pwidth;
                }
                //画块
                g.setColor(scrollBarColor);
                fillRect(g, barwidth + ppos, thisHeight - barwidth, pwidth, barwidth);
                g.setColor(getBorderColor());
                drawRect(g, barwidth + ppos, thisHeight - barwidth, pwidth, barwidth);
                //记录大小
                HSLeft = barwidth + ppos;
                HSTop = thisHeight - barwidth;
                HSWidth = pwidth;
                HSHeight = barwidth;
                //画块上的线
                int tpos = HSWidth / 2 + HSLeft;
                drawRect(g, tpos, HSTop + 2, 0, HSHeight - 4);
                if (tpos - 2 > HSLeft) {
                    drawRect(g, tpos - 2, HSTop + 2, 0, HSHeight - 4);
                }
                if (tpos + 2 < HSLeft + HSWidth) {
                    drawRect(g, tpos + 2, HSTop + 2, 0, HSHeight - 4);
                }
                //三角
                g.setColor(getBorderColor());
                fillTriangle(g, barwidth / 2 - 2, thisHeight - barwidth / 2,
                        barwidth / 2 + 2, thisHeight - barwidth / 2 - 4,
                        barwidth / 2 + 2, thisHeight - barwidth / 2 + 4);
                fillTriangle(g, HBarWidth - barwidth + barwidth / 2 + 2, thisHeight - barwidth / 2,
                        HBarWidth - barwidth + barwidth / 2 - 2, thisHeight - barwidth / 2 - 4,
                        HBarWidth - barwidth + barwidth / 2 - 2, thisHeight - barwidth / 2 + 4);
            }
            if ((scrollBars == SDAConsts.srVertical) || (scrollBars == SDAConsts.srBoth)) {
                //垂直
                g.setColor(scrollBarColor);
                fillRect(g, thisWidth - barwidth, 0, barwidth, barwidth);
                fillRect(g, thisWidth - barwidth, VBarHeight - barwidth, barwidth, barwidth);
                g.setColor(getBorderColor());
                drawRect(g, thisWidth - barwidth, 0, barwidth, barwidth);
                drawRect(g, thisWidth - barwidth, VBarHeight - barwidth, barwidth, barwidth);
                //滚动块
                g.setColor(backColor);
                fillRect(g, thisWidth - barwidth, barwidth, barwidth, VBarHeight - 2 * barwidth);
                g.setColor(getBorderColor());
                drawRect(g, thisWidth - barwidth, barwidth, barwidth, VBarHeight - 2 * barwidth);
                //块大小                    
                int pheight = VBarHeight - 2 * barwidth;
                if (itemList.size() * getFont().getHeight() > VBarHeight) {
                    pheight = ((VBarHeight) * (VBarHeight - 2 * barwidth) / (itemList.size() * getFont().getHeight()));
                }
                //计算块位置
                int ppos = barwidth;
                if (itemList.size() > 0) {
                    ppos = (startLine * getFont().getHeight() * (VBarHeight - 2 * barwidth)) / (itemList.size() * getFont().getHeight());
                }
                //修正位置
                if (ppos + pheight > VBarHeight - 2 * barwidth) {
                    ppos = VBarHeight - 2 * barwidth - pheight;
                }
                //画块
                g.setColor(scrollBarColor);
                fillRect(g, thisWidth - barwidth, barwidth + ppos, barwidth, pheight);
                g.setColor(getBorderColor());
                drawRect(g, thisWidth - barwidth, barwidth + ppos, barwidth, pheight);
                //记录大小
                VSLeft = thisWidth - barwidth;
                VSTop = barwidth + ppos;
                VSWidth = barwidth;
                VSHeight = pheight;
                //画块上的线
                int tpos = VSHeight / 2 + VSTop;
                drawRect(g, VSLeft + 2, tpos, barwidth - 4, 0);
                if (tpos - 2 > VSTop) {
                    drawRect(g, VSLeft + 2, tpos - 2, VSWidth - 4, 0);
                }
                if (tpos + 2 < VSTop + VSHeight) {
                    drawRect(g, VSLeft + 2, tpos + 2, VSWidth - 4, 0);
                }
                //三角
                g.setColor(getBorderColor());
                fillTriangle(g, thisWidth - barwidth + barwidth / 2, barwidth / 2 - 2,
                        thisWidth - barwidth + barwidth / 2 - 4, barwidth / 2 + 2,
                        thisWidth - barwidth + barwidth / 2 + 4, barwidth / 2 + 2);
                fillTriangle(g, thisWidth - barwidth + barwidth / 2 - 4, VBarHeight - barwidth + barwidth / 2 - 2,
                        thisWidth - barwidth + barwidth / 2 + 4, VBarHeight - barwidth + barwidth / 2 - 2,
                        thisWidth - barwidth + barwidth / 2, VBarHeight - barwidth / 2 + 2);
            }
        }
    }
    //打字
    private void paintString(Graphics g) {
        int thisWidth = getWidth();
        int thisHeight = getHeight();
        int HBarWidth = getHBarWidth();
        maxVisibleLineNum = getmaxVisibleLineNum();
        maxLineNum = getMaxLineNum();
        maxLineLenght = getMaxLineLenght();
        g.setColor(getForeColor());
        if (scrollBars == SDAConsts.srNone) {
            SetClip(g, 2, 2, thisWidth - 3, thisHeight - 3);
        }
        if (scrollBars == SDAConsts.srHorizontal) {
            SetClip(g, 2, 2, thisWidth - 3, thisHeight - barwidth - 3);
        }
        if (scrollBars == SDAConsts.srVertical) {
            SetClip(g, 2, 2, thisWidth - barwidth - 3, thisHeight - 3);
        }
        if (scrollBars == SDAConsts.srBoth) {
            SetClip(g, 2, 2, thisWidth - barwidth - 3, thisHeight - barwidth - 3);
        }
        //打字,根据item打印
        SDAListItem item;
        int fontHeight = getFont().getHeight();
        int CheckWidth = showCheckBox ? fontHeight : 0;
        int ImageWidth = showItemImage ? fontHeight : 0;
        String str = "";
        int endline = maxLineNum - startLine - maxVisibleLineNum > 0 ? startLine + maxVisibleLineNum : maxLineNum;
        for (int i = startLine; i < endline; i++) {
            item = (SDAListItem) itemList.elementAt(i);
            str = item.getItemString();
            //参照select,check,image
            if (itemIndex == i) {
                //画背景
                g.setColor(selectedBackColor);
                fillRect(g, 2, 2 + fontHeight * (i - startLine), HBarWidth, fontHeight);
                //打字
                g.setColor(selectedForeColor);
                drawString(g, item.getItemString(), 2 - startLeft + CheckWidth + ImageWidth, 2 + fontHeight * (i - startLine));
            } else {
                //打字
                g.setColor(getForeColor());
                drawString(g, item.getItemString(), 2 - startLeft + CheckWidth + ImageWidth, 2 + fontHeight * (i - startLine));
            }
            if (showCheckBox) {
                g.setColor(getBackColor());
                fillRect(g, 2, 2 + fontHeight * (i - startLine), fontHeight, fontHeight);
                //选择
                g.setColor(borderColor);
                drawRect(g, 2 + fontHeight / 4, 2 + fontHeight * (i - startLine) + fontHeight / 4, fontHeight / 2, fontHeight / 2);
                if (item.isChecked()) {
                    //选择
                    fillRect(g, 2 + fontHeight / 4 + 2, 2 + fontHeight * (i - startLine) + fontHeight / 4 + 2, fontHeight / 2 - 3, fontHeight / 2 - 3);
                }
            }
            //图
            if (showItemImage && item.getImage() != null) {
                drawImage(g, item.getImage(), 2 - startLeft + CheckWidth, 2 + fontHeight * (i - startLine) + (fontHeight - item.getImage().getHeight()) / 2, 0);
            }
        }
    }

    public int getBorderStyle() {
        return borderStyle;
    }

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

    public boolean isHideSelection() {
        return hideSelection;
    }

    public void setHideSelection(boolean hideSelection) {
        this.hideSelection = hideSelection;
        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 void setText(String text) {
        internalSetText(text);
    }

    private void internalSetText(String text) {
        super.setText(text);
        //内容处理为行
        String str = "";
        maxLineLenght = 0;
        while (text.indexOf('\n') > -1) {
            str = text.substring(0, text.indexOf('\n'));
            //加入
            addItem(str, null, false);
            text = text.substring(text.indexOf('\n') + 1);
        }
        if (text.length() > 0) {
            //text，最后一行
            addItem(text, null, false);
        }
        internalPaint();
    }

    private int getMaxLineNum() {
        //获取总行数
        maxLineNum = itemList.size();
        return maxLineNum;
    }

    private int getmaxVisibleLineNum() {
        maxVisibleLineNum = getVBarHeight() / getFont().getHeight();
        getMaxLineNum();
        if (maxVisibleLineNum > maxLineNum) {
            maxVisibleLineNum = maxLineNum;
        }
        return maxVisibleLineNum;
    }

    private int getMaxLineLenght() {
        //获取最大行长度
        int fontHeight = getFont().getHeight();
        int CheckWidth = showCheckBox ? fontHeight : 0;
        int ImageWidth = showItemImage ? fontHeight : 0;
        String str = null;
        SDAListItem item = null;
        maxLineLenght = getHBarWidth();
        for (int i = 0; i < itemList.size(); i++) {
            item = (SDAListItem) itemList.elementAt(i);
            str = item.getItemString();
            if (maxLineLenght < getFont().stringWidth(str) + CheckWidth + ImageWidth) {
                maxLineLenght = getFont().stringWidth(str) + CheckWidth + ImageWidth;
            }
        }
        return maxLineLenght;
    }

    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();
    }

    public int getSelectedBackColor() {
        return selectedBackColor;
    }

    public void setSelectedBackColor(int selectedBackColor) {
        this.selectedBackColor = selectedBackColor;
    }

    public int getSelectedForeColor() {
        return selectedForeColor;
    }