sdalistview.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

        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;
    }

    private void getItemByPos(int x, int y) {
        int itemWidth = maxLenght / colCount;
        int col = (x + startLeft) / itemWidth;
        int row = (y + startTop) / rowHeight;
        SDAListViewItem item = getItemByColRow(col, row);
        if (item != null) {
            curItem = item;
        }
    }

    private SDAListViewItem getItemByColRow(int col, int row) {
        SDAListViewItem item = null;
        int index = row * colCount + col;
        if ((index < itemList.size()) && index > -1) {
            item = (SDAListViewItem) itemList.elementAt(index);
        }
        return item;
    }
    //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;
                    }
                }
            }
        }
        //点到空白按钮位置，获取当前Item
        if (InClientRect(posx, posy, 0, 0, getHBarWidth(), getVBarHeight())) {
            getItemByPos(posx, posy);
            doSelectChange();
            doSelectItem();
        }
    }
    //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;
    }
    //键盘事件处理
    protected void doKeyUp(int keyCode) {
        String key = form.getKeyName(keyCode).toUpperCase();
        SDAListViewItem item = null;
        if (key.equals(SDAConsts.KEY_UP)) {
            if (curItem != null) {
                item = getItemByColRow(curItem.getCol(), curItem.getRow() - 1);
                if (item != null) {
                    curItem = item;
                    doSelectChange();
                    if (curItem.getRow() * rowHeight < startTop) {
                        startTop = curItem.getRow() * rowHeight;
                    }
                }
            }
        }
        if (key.equals(SDAConsts.KEY_DOWN)) {
            if (curItem != null) {
                item = getItemByColRow(curItem.getCol(), curItem.getRow() + 1);
                if (item != null) {
                    curItem = item;
                    doSelectChange();
                    if (curItem.getRow() * rowHeight - startTop > getVBarHeight() - rowHeight) {
                        startTop = curItem.getRow() * rowHeight - getVBarHeight() + rowHeight;
                    }
                }
            }
        }
        if (key.equals(SDAConsts.KEY_LEFT)) {
            if (curItem != null) {
                item = getItemByColRow(curItem.getCol() - 1, curItem.getRow());
                if (item != null) {
                    curItem = item;
                    doSelectChange();
                    if (curItem.getRow() * rowHeight < startTop) {
                        startTop = curItem.getRow() * rowHeight;
                    }
                }
            }
        }
        if (key.equals(SDAConsts.KEY_RIGHT)) {
            if (curItem != null) {
                item = getItemByColRow(curItem.getCol() + 1, curItem.getRow());
                if (item != null) {
                    curItem = item;
                    doSelectChange();
                    if (curItem.getRow() * rowHeight - startTop > getVBarHeight() - rowHeight) {
                        startTop = curItem.getRow() * rowHeight - getVBarHeight() + rowHeight;
                    }
                }
            }
        }
        if (key.equals(SDAConsts.KEY_SELECT) || key.equals(SDAConsts.KEY_ENTER)) {
            doSelectItem();
        }
        repaintControl();
    }

    public void setOnSelectChange(ListViewSelectChangeEvent onSelectChange) {
        this.onSelectChange = onSelectChange;
    }

    private void doSelectChange() {
        if (this.onSelectChange != null) {
            if (curItem != null) {
                onSelectChange.Event(curItem);
            }
        }
    }

    public void setOnSelectItem(ListViewSelectItemEvent onSelectItem) {
        this.onSelectItem = onSelectItem;
    }

    private void doSelectItem() {
        if (this.onSelectItem != null) {
            if (curItem != null) {
                onSelectItem.Event(curItem);
            }
        }
    }

    protected boolean canDownTabNext() {
        return false;
    }

    protected boolean canLeftTabPrior() {
        return false;
    }

    protected boolean canRightTabNext() {
        return false;
    }

    protected boolean canUpTabPrior() {
        return false;
    }
    
}