Marquee Texte sur Blackberry

Question

Je souhaite marquer du texte dans une application BlackBerry.

Answer 1

La voici. Il suffit de faire une classe avec le nom MarqueeLabel et copier-coller ce code, vous pouvez utiliser cette classe pour afficher un texte dans le champ:

package mypackage; 

import java.util.Timer; 

import java.util.TimerTask; 

import net.rim.device.api.system.Display; 

import net.rim.device.api.ui.DrawStyle; 

import net.rim.device.api.ui.Font; 

import net.rim.device.api.ui.Graphics; 

import net.rim.device.api.ui.component.LabelField; 

class MarqueLabel extends LabelField { 

    int currentChar = 0; 

    String currentText = null; 

    Font ourFont; 

    private Timer _scrollTimer; 

    private TimerTask _scrollTimerTask; 

    public MarqueLabel(String text, long style) { 

     super(text, style);  

    } 

    public void paint(Graphics graphics) { 

     currentText = this.getText(); 

     if (currentChar < currentText.length()) { 

      currentText = currentText.substring(currentChar); 

     } 

     graphics.drawText(currentText, 0, 0, DrawStyle.ELLIPSIS, Display.getWidth()); 

     super.paint(graphics); 

    } 

    public void layout(int width, int height) { 

     ourFont = this.getFont(); 

     setExtent(500, ourFont.getHeight()); 

    } 

    protected void onDisplay() { 

     startScroll(); 

    } 

    protected void onUnfocus() { 

     startScroll(); 

    } 

    private void startScroll() { 

     // Start scrolling 

     final String fullText = this.getText(); 

     if (_scrollTimer == null) { 

      _scrollTimer = new Timer(); 

      _scrollTimerTask = new TimerTask() { 

       public void run() { 

        currentChar = currentChar + 2; 

        if (currentChar > fullText.length()) { 

         currentChar = 0; 

        } 

        invalidate(); 

       } 

      }; 

      _scrollTimer.scheduleAtFixedRate(_scrollTimerTask, 0, 450); 

     } 

    } 

    protected void onFocus(int direction) { 

     if (_scrollTimer != null) { 

      _scrollTimerTask.cancel(); 

      _scrollTimer.cancel(); 

      _scrollTimer = null; 

      _scrollTimerTask = null; 

     } 

    } 

    protected boolean navigationMovement(int dx, int dy, 

     int status, int time) { 

     currentText = this.getText(); 

     int oldCurrentChar = currentChar; 

     if (Math.abs(dx) > Math.abs(dy)) { 

      if (dx > 0) { 

       currentChar = Math.min(currentText.length() - 1, 

         currentChar + 1); 

      } else if (dx < 0) { 

       currentChar = Math.max(0, currentChar - 1); 

      } 

      if (oldCurrentChar != currentChar) { 

       this.invalidate(); 

      } 

      return true; 

     } else { 

      return super.navigationMovement(dx, dy, status, time); 

     } 

    } 

    }