java - Blackberry Custom ListField 没有以正确的方式重新绘制

Question

每次我使用自定义 ListField 推送新屏幕时，行的大小都没有达到必须的大小。我尝试使用 invalidate 但它什么也没做。

我不明白为什么当我使用焦点导航或当屏幕变得不活动并返回时，列表以正确的方式显示。

public class AboutListField extends ListField implements ListFieldCallback {

    private Vector rows;

    EncodedImage _rateIcon = EncodedImage
            .getEncodedImageResource("icon_rate.png");
    EncodedImage _privacyIcon = EncodedImage
            .getEncodedImageResource("icon_info.png");
    EncodedImage _legalIcon = EncodedImage
            .getEncodedImageResource("icon_ad.png");
    EncodedImage _facebookIcon = EncodedImage
            .getEncodedImageResource("icon_facebook.png");
    EncodedImage _twitterIcon = EncodedImage
            .getEncodedImageResource("icon_twitter.png");

    private LabelField nameLabel;

    public AboutListField() {
        super(0, ListField.USE_ALL_WIDTH);
        setRowHeight(60);
        setCallback(this);

        Font fontName = Font.getDefault().derive(Font.SERIF_STYLE, 8,
                Ui.UNITS_pt);

        rows = new Vector();

        for (int i = 0; i < 5; i++) {
            HorizontalManager row = new HorizontalManager();
            switch (i) {
            case 0:
                row.add(new BitmapField(_rateIcon.getBitmap()));
                nameLabel = new CustomLabelField("Valorar app", NON_FOCUSABLE,
                        Color.WHITE);
                nameLabel.setFont(fontName);
                row.add(nameLabel);
                break;
            case 1:
                row.add(new BitmapField(_privacyIcon.getBitmap()));
                nameLabel = new CustomLabelField("Política de privacidad",
                        NON_FOCUSABLE, Color.WHITE);
                nameLabel.setFont(fontName);
                row.add(nameLabel);
                break;
            case 2:
                row.add(new BitmapField(_legalIcon.getBitmap()));
                nameLabel = new CustomLabelField("Aviso Legal", NON_FOCUSABLE,
                        Color.WHITE);
                nameLabel.setFont(fontName);
                row.add(nameLabel);
                break;
            case 3:
                row.add(new BitmapField(_facebookIcon.getBitmap()));
                nameLabel = new CustomLabelField("Síguenos en Facebook",
                        NON_FOCUSABLE, Color.WHITE);
                nameLabel.setFont(fontName);
                row.add(nameLabel);
                break;
            case 4:
                row.add(new BitmapField(_twitterIcon.getBitmap()));
                nameLabel = new CustomLabelField("Síguenos en Twitter",
                        NON_FOCUSABLE, Color.WHITE);
                nameLabel.setFont(fontName);
                row.add(nameLabel);
                break;

            default:
                break;
            }
            rows.addElement(row);
        }
        setSize(rows.size());
    }

    protected void drawFocus(Graphics graphics, boolean on) {
        XYRect focusRect = new XYRect();
        getFocusRect(focusRect);

        boolean oldDrawStyleFocus = graphics
                .isDrawingStyleSet(Graphics.DRAWSTYLE_FOCUS);
        try {
            if (on) {
                // set the style so the fields in the row will update its color
                // accordingly
                graphics.setDrawingStyle(Graphics.DRAWSTYLE_FOCUS, true);
                int oldColour = graphics.getColor();
                try {
                    graphics.setColor(Constants.Colors.ORANGE_SELECTED);
                    graphics.fillRect(focusRect.x, focusRect.y,
                            focusRect.width, focusRect.height);
                } finally {
                    graphics.setColor(oldColour);
                }
                // to draw the row again
                drawListRow(this, graphics, getSelectedIndex(), focusRect.y,
                        focusRect.width);
            }

        } finally {
            graphics.setDrawingStyle(Graphics.DRAWSTYLE_FOCUS,
                    oldDrawStyleFocus);
        }
    }

    public void drawListRow(ListField listField, Graphics graphics, int index,
            int y, int width) {
        AboutListField aboutList = (AboutListField) listField;
        HorizontalManager rowManager = (HorizontalManager) aboutList.rows
                .elementAt(index);
        rowManager.drawRow(graphics, 0, y, width, getRowHeight());

    }

    public Object get(ListField listField, int index) {
        // TODO Auto-generated method stub
        return null;
    }

    public int getPreferredWidth(ListField listField) {
        // TODO Auto-generated method stub
        return 0;
    }

    public int indexOfList(ListField listField, String prefix, int start) {
        // TODO Auto-generated method stub
        return 0;
    }

    public boolean navigationClick(int status, int time) {


        switch (this.getSelectedIndex()) {
        case 0:
            //Valorar App

            this.setSelectedIndex(0);
            break;
        case 1:
            // Política de privacidad
            InfosScreen policyScreen = new InfosScreen(InfosScreen.TYPE_PRIVACY);
            UiApplication.getUiApplication().pushScreen(policyScreen);
            this.setSelectedIndex(1);
            break;
        case 2:
            // Aviso Legal
            InfosScreen legalScreen = new InfosScreen(InfosScreen.TYPE_LEGAL);
            UiApplication.getUiApplication().pushScreen(legalScreen);
            this.setSelectedIndex(2);
            break;
        case 3:
            // Facebook
            this.setSelectedIndex(3);
            break;
        case 4:
            // Twitter
            this.setSelectedIndex(4);
            break;
        default:
            break;
        }

        return super.navigationClick(status, time);
    }


    public class HorizontalManager extends Manager {

        public HorizontalManager() {
            super(0);
        }

        public void drawRow(Graphics g, int x, int y, int width, int height) {
            // Arrange the cell fields within this row manager.
            layout(width, height);

            // Place this row manager within its enclosing list.
            setPosition(x, y);

            // Apply a translating/clipping transformation to the graphics
            // context so that this row paints in the right area.
            g.pushRegion(getExtent());

            // Paint this manager's controlled fields.
            subpaint(g);

            g.setColor(0x00CACACA);
            g.drawLine(0, 0, getPreferredWidth(), 0);

            // Restore the graphics context.
            g.popContext();
        }

        protected void sublayout(int width, int height) {
            // set the size and position of each field.
            int fontHeight = Font.getDefault().getHeight();
            int preferredWidth = getPreferredWidth();

            // start with the Bitmap Field of the Radio icon
            Field field = getField(0);
            layoutChild(field, _rateIcon.getWidth(), getRowHeight());
            setPositionChild(field, 20,
                    (getHeight() / 2 - _rateIcon.getHeight() / 2));

            // set the radio name label field
            field = getField(1);
            layoutChild(field, preferredWidth - 16, getRowHeight());
            setPositionChild(field, _rateIcon.getWidth() + 40,
                    (getHeight() / 2 - fontHeight / 2));

            setExtent(preferredWidth, getPreferredHeight());
        }



        // The preferred width of a row is defined by the list renderer.
        public int getPreferredWidth() {
            return Display.getWidth();
        }

        // The preferred height of a row is the "row height" as defined in the
        // enclosing list.
        public int getPreferredHeight() {
            return getRowHeight();
        }
    }

}

Answer 1

在将 Web 位图加载到列表行时，我遇到了类似的问题。仅使该行无效似乎不起作用，必须使该行的父 ListField 无效。为此，我构建了带有父列表句柄的列表行管理器。

如何设置行高？当我调用我的 CustomListField 的设置方法时，我调用了 super.setRowHeight(CUSTOM_ROW_HEIGHT)。这也可以解决问题。