ui/TableList.java

package com.newsapp.ui;

import java.util.Vector;

import com.newsapp.Item;

import net.rim.blackberry.api.browser.Browser;
import net.rim.blackberry.api.browser.BrowserSession;
import net.rim.device.api.system.Display;
import net.rim.device.api.ui.Color;
import net.rim.device.api.ui.Font;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.component.ListField;
import net.rim.device.api.ui.component.ListFieldCallback;

public class TableList extends ListField {
        private Vector _data = null;
        private TableListCallback _callback = null;
        private Font _font = null;

        private int currentPosition = 0;

        public TableList(Vector data) {
                this._data = data;
                this._font = this.getFont().derive(Font.PLAIN, 13);
                this.setFont(this._font);
                this.setRowHeight(-3);

                this.init();
        }

        private void init() {
                this._callback = new TableListCallback();
                this.setCallback(this._callback);
        }

        protected boolean navigationClick(int status, int time) {
                int index = this.getSelectedIndex();
                Item item = (Item)_data.elementAt(index);

                if(item.link != "") {
                        BrowserSession browser = Browser.getDefaultSession();
                        browser.displayPage(item.link);
                }

                return super.navigationClick(status, time);
        }

        private class TableListCallback implements ListFieldCallback {
                public TableListCallback() {

                }

                public void drawListRow(ListField list, Graphics graphics, int index, int y, int width) {
                        currentPosition = index;

                        Item item = (Item)_data.elementAt(index);
                        Vector lines = wrap(item.description, width - 20);

                        int fontHeight = TableList.this.getFont().getHeight();
                        int xPos = 10;
                        int yPos = 5 + y;

                        graphics.setColor(Color.BLACK);
                        graphics.drawRect(0, y, width, (lines.size() + 2)*fontHeight);
                        graphics.setColor(Color.BLACK);
                        graphics.setFont(TableList.this.getFont().derive(Font.BOLD, 13));
                        graphics.drawText(item.title + ":", xPos, yPos, 0, width);
                        yPos = yPos + fontHeight;

                        int yLine = 0;

                        for(int i=0; i<lines.size(); i++) {
                                yLine = i * fontHeight;
                                graphics.setColor(Color.BLACK);
                                graphics.setFont(TableList.this.getFont().derive(Font.PLAIN, 13));
                                graphics.drawText((String)lines.elementAt(i), xPos, yLine + yPos, 0, width);
                        }

                        list.setRowHeight(index, (lines.size() + 2) * fontHeight);
                }

        public Object get(ListField list, int index) {
            return _data.elementAt(index);
        }

        public int getPreferredWidth(ListField list) {
                return Display.getWidth();
        }

        public int indexOfList(ListField list, String prefix, int start) {
                return _data.indexOf(prefix, start);
        }

                private Vector wrap(String text, int width) {
            Vector result = new Vector();
            if(text == null){
                return result;
            }

            boolean hasMore = true;


            int current = 0;
            int lineBreak = -1;
            int nextSpace = -1;

            while (hasMore){
                while (true){
                    lineBreak = nextSpace;
                    if(lineBreak == text.length() - 1){
                        hasMore = false;
                        break;
                    } else {
                        nextSpace = text.indexOf(' ', lineBreak+1);
                        if(nextSpace == -1){
                            nextSpace = text.length() -1;
                        }
                        int linewidth = TableList.this.getFont().getAdvance(text,current, nextSpace-current);
                        if(linewidth > width){
                            break;
                        }
                    }
                }

                String line = text.substring(current, lineBreak + 1);
                result.addElement(line);
                current = lineBreak + 1;
            }

            return result;
                }
        }

        public int getCurrentPosition() {
                return this.currentPosition;
        }
}