pushbuttonfield.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

/*
 * Copyright 2005 by Paulo Soares.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or 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 Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */
package com.lowagie.text.pdf;

import java.io.IOException;

import com.lowagie.text.DocumentException;
import com.lowagie.text.Image;
import com.lowagie.text.Rectangle;
/**
 * Creates a pushbutton field. It supports all the text and icon alignments.
 * The icon may be an image or a template.
 * <p>
 * Example usage:
 * <p>
 * <PRE>
 * Document document = new Document(PageSize.A4, 50, 50, 50, 50);
 * PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("output.pdf"));
 * document.open();
 * PdfContentByte cb = writer.getDirectContent();
 * Image img = Image.getInstance("image.png");
 * PushbuttonField bt = new PushbuttonField(writer, new Rectangle(100, 100, 200, 200), "Button1");
 * bt.setText("My Caption");
 * bt.setFontSize(0);
 * bt.setImage(img);
 * bt.setLayout(PushbuttonField.LAYOUT_ICON_TOP_LABEL_BOTTOM);
 * bt.setBackgroundColor(Color.cyan);
 * bt.setBorderStyle(PdfBorderDictionary.STYLE_SOLID);
 * bt.setBorderColor(Color.red);
 * bt.setBorderWidth(3);
 * PdfFormField ff = bt.getField();
 * PdfAction ac = PdfAction.createSubmitForm("http://www.submit-site.com", null, 0);
 * ff.setAction(ac);
 * writer.addAnnotation(ff);
 * document.close();
 * </PRE>
 * @author Paulo Soares ([e-mail])
 */
public class PushbuttonField extends BaseField {
   
    /** A layout option */    
    public static final int LAYOUT_LABEL_ONLY = 1;
    /** A layout option */    
    public static final int LAYOUT_ICON_ONLY = 2;
    /** A layout option */    
    public static final int LAYOUT_ICON_TOP_LABEL_BOTTOM = 3;
    /** A layout option */    
    public static final int LAYOUT_LABEL_TOP_ICON_BOTTOM = 4;
    /** A layout option */    
    public static final int LAYOUT_ICON_LEFT_LABEL_RIGHT = 5;
    /** A layout option */    
    public static final int LAYOUT_LABEL_LEFT_ICON_RIGHT = 6;
    /** A layout option */    
    public static final int LAYOUT_LABEL_OVER_ICON = 7;
    /** An icon scaling option */    
    public static final int SCALE_ICON_ALWAYS  = 1;
    /** An icon scaling option */    
    public static final int SCALE_ICON_NEVER = 2;
    /** An icon scaling option */    
    public static final int SCALE_ICON_IS_TOO_BIG = 3;
    /** An icon scaling option */    
    public static final int SCALE_ICON_IS_TOO_SMALL = 4;

    /**
     * Holds value of property layout.
     */
    private int layout = LAYOUT_LABEL_ONLY;
    
    /**
     * Holds value of property image.
     */
    private Image image;    
    
    /**
     * Holds value of property template.
     */
    private PdfTemplate template;
    
    /**
     * Holds value of property scaleIcon.
     */
    private int scaleIcon = SCALE_ICON_ALWAYS;
    
    /**
     * Holds value of property proportionalIcon.
     */
    private boolean proportionalIcon = true;
    
    /**
     * Holds value of property iconVerticalAdjustment.
     */
    private float iconVerticalAdjustment = 0.5f;
    
    /**
     * Holds value of property iconHorizontalAdjustment.
     */
    private float iconHorizontalAdjustment = 0.5f;
    
    /**
     * Holds value of property iconFitToBounds.
     */
    private boolean iconFitToBounds;
    
    private PdfTemplate tp;
    
    /**
     * Creates a new instance of PushbuttonField
     * @param writer the document <CODE>PdfWriter</CODE>
     * @param box the field location and dimensions
     * @param fieldName the field name. If <CODE>null</CODE> only the widget keys
     * will be included in the field allowing it to be used as a kid field.
     */
    public PushbuttonField(PdfWriter writer, Rectangle box, String fieldName) {
        super(writer, box, fieldName);
    }
    
    /**
     * Getter for property layout.
     * @return Value of property layout.
     */
    public int getLayout() {
        return this.layout;
    }
    
    /**
     * Sets the icon and label layout. Possible values are <CODE>LAYOUT_LABEL_ONLY</CODE>,
     * <CODE>LAYOUT_ICON_ONLY</CODE>, <CODE>LAYOUT_ICON_TOP_LABEL_BOTTOM</CODE>,
     * <CODE>LAYOUT_LABEL_TOP_ICON_BOTTOM</CODE>, <CODE>LAYOUT_ICON_LEFT_LABEL_RIGHT</CODE>,
     * <CODE>LAYOUT_LABEL_LEFT_ICON_RIGHT</CODE> and <CODE>LAYOUT_LABEL_OVER_ICON</CODE>.
     * The default is <CODE>LAYOUT_LABEL_ONLY</CODE>.
     * @param layout New value of property layout.
     */
    public void setLayout(int layout) {
        if (layout < LAYOUT_LABEL_ONLY || layout > LAYOUT_LABEL_OVER_ICON)
            throw new IllegalArgumentException("Layout out of bounds.");
        this.layout = layout;
    }
    
    /**
     * Getter for property image.
     * @return Value of property image.
     */
    public Image getImage() {
        return this.image;
    }
    
    /**
     * Sets the icon as an image.
     * @param image the image
     */
    public void setImage(Image image) {
        this.image = image;
        template = null;
    }
    
    /**
     * Getter for property template.
     * @return Value of property template.
     */
    public PdfTemplate getTemplate() {
        return this.template;
    }
    
    /**
     * Sets the icon as a template.
     * @param template the template
     */
    public void setTemplate(PdfTemplate template) {
        this.template = template;
        image = null;
    }
    
    /**
     * Getter for property scaleIcon.
     * @return Value of property scaleIcon.
     */
    public int getScaleIcon() {
        return this.scaleIcon;
    }
    
    /**
     * Sets the way the icon will be scaled. Possible values are
     * <CODE>SCALE_ICON_ALWAYS</CODE>, <CODE>SCALE_ICON_NEVER</CODE>,
     * <CODE>SCALE_ICON_IS_TOO_BIG</CODE> and <CODE>SCALE_ICON_IS_TOO_SMALL</CODE>.
     * The default is <CODE>SCALE_ICON_ALWAYS</CODE>.
     * @param scaleIcon the way the icon will be scaled
     */
    public void setScaleIcon(int scaleIcon) {
        if (scaleIcon < SCALE_ICON_ALWAYS || scaleIcon > SCALE_ICON_IS_TOO_SMALL)
            scaleIcon = SCALE_ICON_ALWAYS;
        this.scaleIcon = scaleIcon;
    }
    
    /**
     * Getter for property proportionalIcon.
     * @return Value of property proportionalIcon.
     */
    public boolean isProportionalIcon() {
        return this.proportionalIcon;
    }
    
    /**
     * Sets the way the icon is scaled. If <CODE>true</CODE> the icon is scaled proportionally,
     * if <CODE>false</CODE> the scaling is done anamorphicaly.
     * @param proportionalIcon the way the icon is scaled
     */
    public void setProportionalIcon(boolean proportionalIcon) {
        this.proportionalIcon = proportionalIcon;
    }
    
    /**
     * Getter for property iconVerticalAdjustment.
     * @return Value of property iconVerticalAdjustment.
     */
    public float getIconVerticalAdjustment() {
        return this.iconVerticalAdjustment;
    }
    
    /**
     * A number between 0 and 1 indicating the fraction of leftover space to allocate at the bottom of the icon.
     * A value of 0 positions the icon at the bottom of the annotation rectangle.
     * A value of 0.5 centers it within the rectangle. The default is 0.5.
     * @param iconVerticalAdjustment a number between 0 and 1 indicating the fraction of leftover space to allocate at the bottom of the icon
     */
    public void setIconVerticalAdjustment(float iconVerticalAdjustment) {
        if (iconVerticalAdjustment < 0)
            iconVerticalAdjustment = 0;
        else if (iconVerticalAdjustment > 1)
            iconVerticalAdjustment = 1;
        this.iconVerticalAdjustment = iconVerticalAdjustment;
    }
    
    /**
     * Getter for property iconHorizontalAdjustment.
     * @return Value of property iconHorizontalAdjustment.
     */
    public float getIconHorizontalAdjustment() {
        return this.iconHorizontalAdjustment;
    }
    
    /**
     * A number between 0 and 1 indicating the fraction of leftover space to allocate at the left of the icon.
     * A value of 0 positions the icon at the left of the annotation rectangle.
     * A value of 0.5 centers it within the rectangle. The default is 0.5.
     * @param iconHorizontalAdjustment a number between 0 and 1 indicating the fraction of leftover space to allocate at the left of the icon
     */
    public void setIconHorizontalAdjustment(float iconHorizontalAdjustment) {
        if (iconHorizontalAdjustment < 0)
            iconHorizontalAdjustment = 0;
        else if (iconHorizontalAdjustment > 1)
            iconHorizontalAdjustment = 1;
        this.iconHorizontalAdjustment = iconHorizontalAdjustment;
    }
    
    private float calculateFontSize(float w, float h) throws IOException, DocumentException {
        BaseFont ufont = getRealFont();
        float fsize = fontSize;
        if (fsize == 0) {
            float bw = ufont.getWidthPoint(text, 1);
            if (bw == 0)
                fsize = 12;
            else
                fsize = w / bw;
            float nfsize = h / (1 - ufont.getFontDescriptor(BaseFont.DESCENT, 1));
            fsize = Math.min(fsize, nfsize);
            if (fsize < 4)
                fsize = 4;
        }
        return fsize;
    }
    
    /**
     * Gets the button appearance.
     * @throws IOException on error
     * @throws DocumentException on error
     * @return the button appearance
     */    
    public PdfAppearance getAppearance() throws IOException, DocumentException {
        PdfAppearance app = getBorderAppearance();
        Rectangle box = new Rectangle(app.getBoundingBox());
        if ((text == null || text.length() == 0) && (layout == LAYOUT_LABEL_ONLY || (image == null && template == null && iconReference == null))) {
            return app;
        }
        if (layout == LAYOUT_ICON_ONLY && image == null && template == null && iconReference == null)
            return app;