blackberry - 在 BlackBerry UI 右对齐问题

Question

在 BlackBerry UI 我试图对齐一些 LabelFields 右对齐和左对齐：

为此，我在顶层创建了一个 VertiFieldManager，然后向其添加一个 Horizo​​ntalFieldmanager，并将所有 lalbelFields 添加到 Horizo​​ntalFieldManager，

水平字段管理器正在强制内容左对齐。如何对齐右侧的字段？

我尝试了间距，但在具有不同 Pixcels 分辨率的 BB 设备中看起来不太好。

请指教。

Answer 1

我还是 BB 的新手，但是您是否尝试过更改 Horizo​​ntalField 的 Long 样式？

Answer 2

不幸的是，没有很好的解决方案。比以前小我认为是这样的：

HorizontalFieldManager hfm = new HorizontalFieldManager();

LabelField leftField = new LabelField("One");
hfm.add(leftField);

LabelField rightField = new LabelField("Two", LabelField.USE_ALL_WIDTH | DrawStyle.RIGHT);
hfm.add(rightField);

基本上，我们将所有可用宽度区域用于第二个字段，并要求它以右对齐方式绘制文本。这个解决方案没问题，因为 LabeLField 不可聚焦。一旦您必须处理可聚焦的字段，请使用@Signare 的解决方案。

Answer 3

试试这个代码 -

JustifiedHorizontalFieldManager j=new JustifiedHorizontalFieldManager(new NullField(),your_field, true);
add(j);

//JustifiedHorizo​​ntalFieldManager 类如下。

public class JustifiedHorizontalFieldManager extends Manager
{
    private static final int SYSTEM_STYLE_SHIFT = 32;

public Field _leftField;
public Field _rightField;

private boolean _giveLeftFieldPriority;

public JustifiedHorizontalFieldManager( Field leftField, Field rightField, boolean giveLeftFieldPriority )
{
    this( leftField, rightField, giveLeftFieldPriority, Field.USE_ALL_WIDTH );
}

public JustifiedHorizontalFieldManager( Field leftField, Field rightField, boolean giveLeftFieldPriority, long style )
{
    super( style );

    _leftField = leftField;
    _rightField = rightField;

    add( _leftField );
    add( _rightField );

    _giveLeftFieldPriority = giveLeftFieldPriority;
}

public JustifiedHorizontalFieldManager( boolean giveLeftFieldPriority, long style )
{
    super( style );
    _giveLeftFieldPriority = giveLeftFieldPriority;
}

public void addLeftField( Field field )
{
    if( _leftField != null ) {
        throw new IllegalStateException();
    }
    _leftField = field;
    add( _leftField );
}

public void addRightField( Field field )
{
    if( _rightField != null ) {
        throw new IllegalStateException();
    }
    _rightField = field;
    add( _rightField );
}

public int getPreferredWidth()
{
    return _leftField.getPreferredWidth() + _rightField.getPreferredWidth();
}

public int getPreferredHeight()
{
    return Math.max( _leftField.getPreferredHeight(), _rightField.getPreferredHeight() );
}

protected void sublayout( int width, int height )
{
    Field firstField;
    Field secondField;
    if( _giveLeftFieldPriority ) {
        firstField = _leftField;
        secondField = _rightField;
    } else {
        firstField = _rightField;
        secondField = _leftField;
    }

    int maxHeight = 0;

    int availableWidth = width;
    availableWidth -= _leftField.getMarginLeft();
    availableWidth -= Math.max( _leftField.getMarginRight(), _rightField.getMarginLeft() );
    availableWidth -= _rightField.getMarginRight();

    layoutChild( firstField, availableWidth, height - firstField.getMarginTop() - firstField.getMarginBottom() );
    maxHeight = Math.max( maxHeight, firstField.getMarginTop() + firstField.getHeight() + firstField.getMarginBottom() );
    availableWidth -= firstField.getWidth();

    layoutChild( secondField, availableWidth, height - secondField.getMarginTop() - secondField.getMarginBottom() );
    maxHeight = Math.max( maxHeight, secondField.getMarginTop() + secondField.getHeight() + secondField.getMarginBottom() );
    availableWidth -= secondField.getWidth();

    if( !isStyle( Field.USE_ALL_HEIGHT ) ) {
        height = maxHeight;
    }
    if( !isStyle( Field.USE_ALL_WIDTH ) ) {
        width -= availableWidth;
    }

    setPositionChild( _leftField, _leftField.getMarginLeft(), getFieldY( _leftField, height ) );
    setPositionChild( _rightField, width - _rightField.getWidth() - _rightField.getMarginRight(), getFieldY( _rightField, height ) );

    setExtent( width, height );
}

private int getFieldY( Field field, int height )
{
    switch( (int)( ( field.getStyle() & FIELD_VALIGN_MASK ) >> SYSTEM_STYLE_SHIFT ) ) {
        case (int)( FIELD_BOTTOM >> SYSTEM_STYLE_SHIFT ):
            return height - field.getHeight() - field.getMarginBottom();
        case (int)( FIELD_VCENTER >> SYSTEM_STYLE_SHIFT ):
            return field.getMarginTop() + ( height - field.getMarginTop() - field.getHeight() - field.getMarginBottom() ) / 2;
        default:
            return field.getMarginTop();
    }
}


public Field getLeftField()
{
    return _leftField;
}

public Field getRightField()
{
    return _rightField;
}

public void replace( Field oldField, Field newField )
{
    if( oldField == newField ) {
        // Nothing to do
        return;
    }

    if( oldField == _leftField ) {
        _leftField = newField;
    } else if( oldField == _rightField ) {
        _rightField = newField;
    }
    add( newField );
    delete( oldField );
}



}