LayoutForm.java

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package com.arcle.rmt.superwaba.ui;

import superwaba.ext.xplat.ui.MultiEdit;
import waba.ui.Container;
import waba.ui.Label;
import waba.ui.Control;
import waba.ui.Edit;
import waba.fx.Font;

public abstract class LayoutForm extends Form {
    public LayoutForm() {
        setBorderStyle(BORDER_SIMPLE);
    }

    protected abstract Control[][] getFormControls();


    protected void layoutControls(Container form, Control[][] controls) {
        int maxLabelWidth = 1;
        final int xGap = 1;
        final int yGap = 1;

        int xWrapTreshold = (form.getSize().width()) / 3;

        Control prevLabel = null;   // placed on the left
        Control prevField = null;

        // find maximum size of the label
        for(int i=0; i<controls.length; i++) {
            Control[] row = controls[i];
            Control label = row[0];
            Control field = row[1];
            int preferred = label.getPreferredWidth();
            if(maxLabelWidth < preferred && preferred < xWrapTreshold) {
                maxLabelWidth = preferred;
            }
        }

        // layout the next controls
        int labelX, labelY, labelWidth, labelHeight;
        int fieldX, fieldY, fieldWidth, fieldHeight;
        boolean wasFull = false;
        for(int i=0; i<controls.length; i++) {
            Control[] row = controls[i];
            Control label = row[0];
            Control field = row[1];

            labelX = Control.LEFT + xGap;

            if (prevLabel == null) {
               // first row?
                labelY = yGap;
            } else {
                labelY = Control.AFTER + yGap;
            }


            Control labelRelative;
            Control fieldRelative;

            if (isTextEntry(field) && (
                  label.getPreferredWidth() >= xWrapTreshold
                  || label.getPreferredWidth() < field.getPreferredHeight()
                 ) ||
                 isMultilineTextEntry(field)) {
                // place label on its own row
                labelX = Control.LEFT + xGap;
                labelY = Control.AFTER + yGap;
                labelWidth = Control.PREFERRED;
                labelHeight = Control.PREFERRED;
                labelRelative = prevField;

                // place field below label.
                fieldX = Control.LEFT + xGap;
                fieldY = Control.AFTER + yGap;
                fieldWidth = Control.FILL - xGap;
                fieldHeight = Control.PREFERRED;
                wasFull = true;

            } else {
                labelWidth = maxLabelWidth;
                labelHeight = field.getPreferredHeight();

                if (wasFull) {
                    labelRelative = prevField;
                    wasFull = false;

                } else {
                    labelRelative = prevLabel;
                }

                // place field to the right of label
                fieldX = Control.AFTER + xGap;
                fieldY = Control.SAME;
                fieldWidth = (isTextEntry(field) ? Control.FILL
                                : Control.PREFERRED) - xGap;
                fieldHeight = Control.SAME;

            }

            form.add(label);
            label.setRect(labelX, labelY, labelWidth, labelHeight,
                labelRelative);

            form.add(field);
            field.setRect(fieldX, fieldY, fieldWidth, fieldHeight, label);

            prevLabel = label;
            prevField = field;
        }
    }


    protected boolean isTextEntry(Control ctrl) {
        return ctrl instanceof Edit || ctrl instanceof MultiEdit;
    }

    protected boolean isMultilineTextEntry(Control ctrl) {
        return ctrl instanceof MultiEdit;
    }


    protected void layoutChildren() {
        Control[][] children = getFormControls();
        layoutControls(this, children);
    }


    protected Label createLabel(String caption) {
        Label lb = new Label(caption, Control.RIGHT);
        Font f = lb.getFont();
        lb.setFont(f.asBold());
        return lb;
    }

    protected MultiEdit createMultiEdit(String text, int rowCount,
        int spaceBetweenLines) {
        return new MultiEdit(text, rowCount, spaceBetweenLines);
    }

    protected Edit createEdit(String text) {
        return new Edit(text);
    }

}

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