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BlackBerry Java Development Environment Development Guide

Code sample: Creating a custom layout manager

Example: DiagonalManager.java

/**

* DiagonalManager.java

Specify the arrangement of the child

fields.

Override sublayout() to retrieve the total number of fields in the manager.

To control how each child field is added to the screen, call setPositionChild() and

layoutChild() for each field that the manager contains.

protected void sublayout(int width, int height) {

int x = 0;

int y = 0;

Field field;

int numberOfFields = getFieldCount();

for (int i=0; i<numberOfFields; ++i) {

field = getField(i);

layoutChild(field, width, height);

setPositionChild(field, x, y);

x += field.getPreferredWidth();

y += field.getPreferredHeight();

}

setExtent(width,height);

}

Set the size of the child fields. >In sublayout(), invoke setExtent().

Specify how the fields receive focus. >Override nextFocus().

protected int nextFocus(int direction, boolean alt) {

int index = this.getFieldWithFocusIndex();

if(alt) {

if(direction < 0) {

// action to perform if trackwheel is rolled up

} else {

// action to perform if trackwheel is rolled down

}

if (index == this.getFieldWithFocusIndex()) {

return super.nextFocus(direction, alt);

} else {

return index;

}

Repaint the fields when the visible

region changes.

By default, the custom manager invokes paint() to repaint all of the fields without regard to the

clipping region.

> Implement subpaint().

Task Steps

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Blackberry JAVA DEVELOPMENT ENVIRONMENT - - CRYPTOGRAPHIC SMART CARD DRIVER - DEVELOPMENT GUIDE Guida alla Risoluzione dei Problemi Pagina 30

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