BaseInputTextControl.java

/*
    GNU LESSER GENERAL PUBLIC LICENSE
    Copyright (C) 2006 The Lobo Project

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Contact info: lobochief@users.sourceforge.net
 */
/*
 * Created on Jan 15, 2006
 */
package org.lobobrowser.html.renderer;

import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Insets;

import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.JTextComponent;

import org.lobobrowser.html.domimpl.ElementImpl;
import org.lobobrowser.html.domimpl.HTMLBaseInputElement;
import org.lobobrowser.util.gui.WrapperLayout;

abstract class BaseInputTextControl extends BaseInputControl {
  private static final long serialVersionUID = -4852316720577045230L;
  private static final float DEFAULT_FONT_SIZE = 14.0f;
  protected final JTextComponent widget;

  public BaseInputTextControl(final HTMLBaseInputElement modelNode) {
    super(modelNode);
    this.setLayout(WrapperLayout.getInstance());
    final JTextComponent widget = this.createTextField();
    final Font font = widget.getFont();
    widget.setFont(font.deriveFont(DEFAULT_FONT_SIZE));
    widget.setDocument(new LimitedDocument());

    // Note: Value attribute cannot be set in reset() method.
    // Otherwise, layout revalidation causes typed values to
    // be lost (including revalidation due to hover.)
    final ElementImpl element = this.controlElement;
    final String value = element.getAttribute("value");
    widget.setText(value);

    this.widget = widget;
    this.add(widget);
  }

  @Override
  public void reset(final int availWidth, final int availHeight) {
    super.reset(availWidth, availHeight);
    final String maxLengthText = this.controlElement.getAttribute("maxlength");
    if (maxLengthText != null) {
      try {
        this.maxLength = Integer.parseInt(maxLengthText);
      } catch (final NumberFormatException nfe) {
        // ignore
      }
    }

  }

  protected abstract JTextComponent createTextField();

  private int maxLength = -1;

  /*
   * (non-Javadoc)
   *
   * @see org.xamjwg.html.domimpl.InputContext#getMaxLength()
   */
  @Override
  public int getMaxLength() {
    return this.maxLength;
  }

  /*
   * (non-Javadoc)
   *
   * @see org.xamjwg.html.domimpl.InputContext#getReadOnly()
   */
  @Override
  public boolean getReadOnly() {
    return !this.widget.isEditable();
  }

  /*
   * (non-Javadoc)
   *
   * @see org.xamjwg.html.domimpl.InputContext#getValue()
   */
  @Override
  public String getValue() {
    return this.widget.getText();
  }

  /*
   * (non-Javadoc)
   *
   * @see org.xamjwg.html.domimpl.InputContext#select()
   */
  @Override
  public void select() {
    this.widget.selectAll();
  }

  /*
   * (non-Javadoc)
   *
   * @see org.xamjwg.html.domimpl.InputContext#setDisabled(boolean)
   */
  @Override
  public void setDisabled(final boolean disabled) {
    super.setDisabled(disabled);
    this.widget.setEnabled(!disabled);
  }

  /*
   * (non-Javadoc)
   *
   * @see org.xamjwg.html.domimpl.InputContext#setMaxLength(int)
   */
  @Override
  public void setMaxLength(final int maxLength) {
    this.maxLength = maxLength;
  }

  /*
   * (non-Javadoc)
   *
   * @see org.xamjwg.html.domimpl.InputContext#setReadOnly(boolean)
   */
  @Override
  public void setReadOnly(final boolean readOnly) {
    this.widget.setEditable(!readOnly);
  }

  /*
   * (non-Javadoc)
   *
   * @see org.xamjwg.html.domimpl.InputContext#setValue(java.lang.String)
   */
  @Override
  public void setValue(final String value) {
    this.widget.setText(value);
  }

  @Override
  public java.awt.Dimension getPreferredSize() {
    final int size = this.size;
    final JTextComponent widget = this.widget;
    final FontMetrics fm = widget.getFontMetrics(widget.getFont());
    final Insets insets = widget.getInsets();
    int pw, ph;
    if (size == -1) {
      pw = 100;
    } else {
      pw = insets.left + insets.right + (fm.charWidth('0') * size);
    }
    ph = fm.getHeight() + insets.top + insets.bottom;
    return new java.awt.Dimension(pw, ph);
  }

  public void resetInput() {
    this.widget.setText("");
  }

  /**
   * Implements maxlength functionality.
   */
  private class LimitedDocument extends javax.swing.text.PlainDocument {
    private static final long serialVersionUID = 5095817476961455383L;

    /*
     * (non-Javadoc)
     *
     * @see javax.swing.text.PlainDocument#insertString(int, java.lang.String,
     * javax.swing.text.AttributeSet)
     */
    @Override
    public void insertString(final int offs, final String str, final AttributeSet a) throws BadLocationException {
      final int max = BaseInputTextControl.this.maxLength;
      if (max != -1) {
        final int docLength = this.getLength();
        if (docLength >= max) {
          return;
        }
        final int strLen = str.length();
        if ((docLength + strLen) > max) {
          final String shorterStr = str.substring(0, max - docLength);
          super.insertString(offs, shorterStr, a);
        } else {
          super.insertString(offs, str, a);
        }
      } else {
        super.insertString(offs, str, a);
      }
    }
  }
}