How to get BitMapField painted on screen invalidate()

Mark and. Al to the RIM:

If you have one interface:

public interface Placeable {

    public abstract int X();
    public abstract int Y();

}

which is used to create a BitMapfield that implements this interface and is contained in a screen with a delegated manager:

import net.berrysoft.dib.interfaces.Placeable;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Manager;

public class GameManager extends Manager {

    public GameManager() {
        super(Manager.NO_HORIZONTAL_SCROLL | Manager.NO_VERTICAL_SCROLL);
    }

    protected void sublayout(int width, int height) {
        Placeable field;

        // Loop through all the fields contained with the layout manager
        for(int i = 0; i < getFieldCount(); i++) {
            field = (Placeable)getField(i);     // Get a field (the board)

            // Set the position of the field based on field's coordinates
            setPositionChild((Field) field, field.X(), field.Y());
            layoutChild((Field) field, width, height);      // Layout the field
        }

        setExtent(width, height);       // Set the manager's dimensions
    }

}

Why not invalidating the display, layout of the screen or even the two leads the BitMapField repainted to a new position (if its coordinates were in facted modified by another code)?

Here is the corresponding code of the base class abstract of an extended BitMapField:

public abstract class Block extends BitmapField implements Placeable {

    public  boolean isSelected( ) { return selected; }
    public  void    setSelected( boolean selected ) { this.selected = selected; }

    public  String Name()   { return name; }

    Block(String name, int x, int y, int left, int top, int width, int height) {
        this.name = name;

        // Extract the bitmap for this block
        bitmap = new Bitmap(width, height);
        Graphics g = new Graphics(bitmap);
        g.drawBitmap(0, 0, width, height, Bitmap.getBitmapResource("blocks.png"), left, top);
        setBitmap(bitmap);

        this.x = (x * Game.BLOCKSIZE) + Game.getBoard( ).X( ) + Game.BOARDER_SIZE;
        this.y = (y * Game.BLOCKSIZE) + Game.getBoard( ).Y( ) + Game.BOARDER_SIZE;

        x1 = x;     // Save starting location for new game reset
        y1 = y;
    }

    public  void click( ) {
        selected = !selected;
    }

    public void move(int d) {
        if( !isSelected( ) )
            return;

        // Move the block
        switch(d) {
            case Move.LEFT:
                this.x = x - Game.BLOCKSIZE;
                break;
            case Move.RIGHT:
                this.x = x + Game.BLOCKSIZE;
                break;
            case Move.UP:
                this.y = y - Game.BLOCKSIZE;
                break;
            case Move.DOWN:
                this.y = y + Game.BLOCKSIZE;
                break;
        }
    }

    public void reset( ) {
        x = x1;
        y = y1;
    }

    public boolean  isFocusable() {
        return true;
    }

    // Placeable Interface
    public      int X()     { return x; }
    public      int Y()     { return y; }

    // PRIVATE IMPLEMENTATION

    private     static  int     dotSize = 8;

    private     String  name;                   // Family member
    private     int     x, y;
    private     int     x1, y1;                 // Initial coordinates
    private     Bitmap  bitmap;

    protected   boolean selected;               // True if selected for movement

    protected void drawFocus(Graphics g, boolean on) {
        if( selected ) {
            // Draw selection marker
            g.setColor(Color.GREEN);
            g.fillArc(getWidth()/2 - dotSize/2, getHeight()/2 - dotSize/2, dotSize, dotSize, 0, 360);
        } else {
            // Draw focus marker
            g.setColor(Color.YELLOW);
            g.fillArc(getWidth()/2 - dotSize/2, getHeight()/2 - dotSize/2, dotSize, dotSize, 0, 360);
        }
        invalidate( );
    }

}

It seems we should be able to invalidate everything simply screen when a block is placed, and that this would then re - introduce the screen through Manager representative, who would in turn ask each block layout, then the painting, but instead, regardless of the coordinates of blocks, it appears at the same place and does NOT move.

Is this a bug in the API? How do I invalidate the screen and the repainted? (That is using the API, as it was designed to be used)

When an object is invalidated, the framework calls it the layout() and then object? What is the sequence of events in the frame please.

Patrick

When the position of a field is changed, you must call updateLayout().

updateLayout() call layout page/sublayout on the fields, then invalidate().

Invalidate() simply calls the object.

Tags: BlackBerry Developers

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