fileselector.java

很好的基于java的手机文本阅读器anyview 2.0源码,

        Image window = Image.createImage(windowImage.getWidth(),
                                         windowImage.getHeight());
        Graphics g = window.getGraphics();

        g.drawImage(windowImage, 0, 0, ANCHOR);

        //绘制停留框
        g.setColor(AnyView.bordorcolor);
        int y = VecPad + 5 +
                (itemIndex - topIndex) * (AnyView.cf.FontHeight + LinePad);
        g.drawImage(cube, 2, y, ANCHOR);
        g.setStrokeStyle(Graphics.DOTTED);
        g.drawRoundRect(2, y - 1, cubeWidth - 1, CustomFont.FontHeight + 3, 8,
                        8);
        g.setStrokeStyle(Graphics.SOLID);

        return window;
    }

    public void destroy() {
        windowImage = null;
        cube = null;
        fileList.removeAllElements();
    }

    public boolean bof() {
        return (topIndex == 0);
    }

    public void keyUp() {
        itemIndex--;
        if (itemIndex < 0) {
            itemIndex = 0;
            return;
        }
        if (itemIndex < topIndex) {
            topIndex -= ShowItems;
            topIndex = topIndex < 0 ? 0 : topIndex;
            refreshList();
        }
    }

    public void keyDown() {
        itemIndex++;
        if (itemIndex == fileList.size()) { //已到达最后一项
            itemIndex = fileList.size() - 1;
            return;
        }

        if (itemIndex - topIndex == ShowItems) {
            topIndex++;
            refreshList();
        }
    }

    public void keyLeft() {
        if (bof()) {
            WINDOW_STATE = CLOSED;
            return;
        }

        if (topIndex == 0) { //向上翻页无效
            return;
        }
        topIndex -= ShowItems;
        topIndex = topIndex < 0 ? 0 : topIndex;
        itemIndex = topIndex;
        refreshList();
    }

    public void keyRight() {
        if (topIndex + ShowItems >= fileList.size()) { //翻页无效
            return;
        }
        topIndex += ShowItems;
        if (topIndex + ShowItems > fileList.size()) { //到顶了
            topIndex = fileList.size() - ShowItems;
        }
        itemIndex = topIndex;
        refreshList();
    }

    public void keyFire() {
        Files f = (Files) fileList.elementAt(itemIndex);
        if (!AnyView.Root.equals(root)) { //不是根目录
            if (itemIndex == 0) { //返回上级目录
                String filename = root.substring(0, root.length() - 1);
                root = filename.substring(0, filename.lastIndexOf('/') + 1);
                openDir();
                return;
            }
        }

        if (f.type == DIR) {
            root += f.filename;
            openDir();
        } else if (f.type == TXT) {
            sc.saveRec();
            destroy();
            AnyView.rootPath = root;
            AnyView.av.switchTxt(root + f.filename);
            //System.out.println("txt = " + root + f.filename);
        } else if (f.type == IAV) {
            destroy();
            AnyView.av.switchIav(root + f.filename);
            //System.out.println("iav = " + root + f.filename);
        }
    }


    protected void pointerPressed(int x, int y) {
        //System.out.println(x + ", " + y);
        super.pointerPressed(x, y);

        if (!contains(PRESSED_X, PRESSED_Y)) {
            //WINDOW_STATE = CLOSED;
            return;
        }

        //首先检查是不是翻页
        pageup = false;
        pagedown = false;
        if (showScrollBar) { //有滚动条时才会有翻页的动作
            int top = height - ButtonHeight;
            if (PRESSED_Y > top && PRESSED_Y < height) { //在翻页按钮的Y轴范围内
                if (PRESSED_X > width >> 1) { //向下翻
                    pagedown = true;
                } else if (PRESSED_X > 0) { //向上翻
                    pageup = true;
                }
            }
        }

        //判断用户当前的选择项
        int find = -1;
        for (int i = 0; i < ShowItems && find == -1; i++) {
            int top = VecPad + i * (CustomFont.FontHeight + LinePad) - 1;
            if (PRESSED_Y > top && PRESSED_Y < top + CustomFont.FontHeight) {
                find = topIndex + i;
                itemIndex = topIndex + i;
                //System.out.println("pressed: itemIndex = " + itemIndex);
            }
        }
    }

    protected void pointerDragged(int x, int y) {

    }

    protected void pointerReleased(int x, int y) {
        //System.out.println(x + ", " + y);
        super.pointerReleased(x, y);

        if (!contains(RELEASE_X, RELEASE_Y)) {
            WINDOW_STATE = CLOSED;
            return;
        }

        //首先检查是不是翻页
        if (showScrollBar) { //有滚动条时才会有翻页的动作
            int top = height - ButtonHeight;
            if (RELEASE_Y > top && RELEASE_Y < height) { //在翻页按钮的Y轴范围内
                if (RELEASE_X > width >> 1) { //向下翻
                    if (!pagedown) { //按下时的动作并不是向下翻页
                        return;
                    }
                    if (topIndex + ShowItems >= fileList.size()) { //翻页无效
                        return;
                    }
                    topIndex += ShowItems;
                    if (topIndex + ShowItems > fileList.size()) { //到顶了
                        topIndex = fileList.size() - ShowItems;
                    }
                    itemIndex = topIndex;
                    refreshList();
                } else if (RELEASE_X > 0) { //向上翻
                    if (!pageup) { //按下时的动作并不是向上翻页
                        return;
                    }
                    if (topIndex == 0) { //向上翻页无效
                        return;
                    }
                    topIndex -= ShowItems;
                    topIndex = topIndex < 0 ? 0 : topIndex;
                    itemIndex = topIndex;
                    refreshList();
                }
            }
        }

        //判断用户当前的选择项
        int find = -1;
        for (int i = 0; i < ShowItems && find == -1; i++) {
            int top = VecPad + i * (CustomFont.FontHeight + LinePad) - 1;
            if (RELEASE_Y > top && RELEASE_Y < top + CustomFont.FontHeight) {
                find = i + topIndex;
                //System.out.println("released: find = " + find);
            }
        }

        if (find == -1) {
            return;
        }

        if (find == itemIndex) { //用户确认选择功能
            keyFire();
        }

        else {
            itemIndex = find;
        }
    }


    class Files {
        String filename;
        int type;

        public Files(String f, int t) {
            filename = f;
            type = t;
        }
    }
}