如何在Blackberry中使用水平字段管理器右对齐labelfield

问题描述

我想在Horizo​​ntalFieldManager中添加两个labelfields，我想将两个标签显示为这样一个向左对齐，而另一个向右对齐

I want to add two labelfields in a HorizontalFieldManager, I want to show two labels as one left aligned and another right aligned like this

hfm1 = new HorizontalFieldManager(Manager.USE_ALL_WIDTH);
        hfm1.setMargin(10,0,10,0);
        l1 = new LabelField("Weight:");
        l2 = new LabelField("20");
        l1.setMargin(0,10,0,0);
        l2.setMargin(0,5,0,0);
        hfm1.add(l1);
        hfm1.add(l2);

推荐答案

尝试此代码

LabelField labl1=new LabelField("weight");
LabelField labl2=new LabelField("20");
JustifiedHorizontalFieldManager JustifiedHorizontalFieldManager=new JustifiedHorizontalFieldManager(labl1,labl2,true);
add(JustifiedHorizontalFieldManager);

JustifiedHorizo​​ntalFieldManager类在下面给出-

JustifiedHorizontalFieldManager class is given below-

import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Manager;

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 );
    }

}

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