Blackberry JAVA DEVELOPMENT ENVIRONMENT - - CRYPTOGRAPHIC SMART CARD DRIVER - DEVELOPMENT GUIDE Průvodce řešením problémů stáhnout pdf (Strana 29)

1: Creating UIs

Create custom layout managers

Task Steps

Create a custom layout manager. > Extend the Manager class or one of its subclasses.

class DiagonalManager extends Manager {

public DiagonalManager(long style){

super(style);

}

...

}

Return a preferred field width. >Override getPreferredWidth() so that it returns the preferred field width for the manager.

public int getPreferredWidth() {

int width = 0;

int numberOfFields = getFieldCount();

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

width += getField(i).getPreferredWidth();

}

return width;

}

Organize more than one TextField or

Manager object.

> Override the respective getPreferredWidth() methods for the TextField or Manager

objects.

Organize multiple TextFields

horizontally.

>Override layout().

Return a preferred field height. >Override getPreferredHeight() so that it returns the preferred field height for the

manager.

public int getPreferredHeight() {

int height = 0;

int numberOfFields = getFieldCount();

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

height += getField(i).getPreferredHeight();

}

return height;

}

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Blackberry JAVA DEVELOPMENT ENVIRONMENT - - CRYPTOGRAPHIC SMART CARD DRIVER - DEVELOPMENT GUIDE Průvodce řešením problémů Strana 29