eventhandler.java

Java生成PDF Java生成PDF Java生成PDF

// $Id: EventHandler.java,v 1.2 2007/02/21 14:23:49 mike Exp $

package org.faceless.pdf2.viewer;

import java.awt.*;
import java.util.*;
import java.awt.geom.Rectangle2D;
import java.awt.geom.GeneralPath;
import javax.swing.*;
import javax.swing.event.MouseInputListener;
import java.awt.event.*;
import org.faceless.pdf2.*;
import org.faceless.pdf2.Event;


/**
 * <p>
 * The <code>EventHandler</code> class can be extended to process mouse and keyboard
 * actions on a PDFViewport. We anticipate that like Acrobat, the viewer will
 * have several different "modes", such as text selection, clicking on annotations
 * and so on, and we expect a different EventHandler for each of these.
 * </p>
 * @since 2.7.8
 */
public class EventHandler
{
    /**
     * Parameter to the constructor indicating this handler tracks mouse click events
     */
    public static final int TYPE_MOUSE = 1;

    /**
     * Parameter to the constructor indicating this handler tracks mouse motion events
     */
    public static final int TYPE_MOUSEMOTION = 2;

    /**
     * Parameter to the constructor indicating this handler tracks keyboard events.
     */
    public static final int TYPE_KEYBOARD = 4;

    private final int types;
    private PDFViewport viewport;

    /**
     * Create a new EventHandler
     * @param types the types of event this handler is for - a logical-or of one or
     * more of {@link #TYPE_MOUSE}, {@link #TYPE_MOUSEMOTION} or {@link #TYPE_KEYBOARD}.
     */
    public EventHandler(int types) {
        this.types = types;
    }

    final int getType() {
        return types;
    }

    final void setViewport(PDFViewport viewport) {
        this.viewport = viewport;
    }

    /**
     * Return the Viewport this handler is registered to.
     */
    public final PDFViewport getViewport() {
        return viewport;
    }

    /**
     * Called when a page is displayed in the viewport
     */
    public void pageDisplayed(PDFNavigationEvent event) {
    }

    /**
     * Called when a page is hidden in the viewport
     */
    public void pageHidden(PDFNavigationEvent page) {
    }

    /**
     * Called when a mouse button is pressed on a page displayed in the viewport.
     * Only called if the type includes {@link #TYPE_MOUSE}
     */
    public void mousePressed(PDFMouseEvent event) {
    }

    /**
     * Called when a mouse button is released on a page displayed in the viewport.
     * Only called if the type includes {@link #TYPE_MOUSE}
     */
    public void mouseReleased(PDFMouseEvent event) {
    }

    /**
     * Called when the mouse is clicked on a page displayed in the viewport.
     * Only called if the type includes {@link #TYPE_MOUSE}
     */
    public void mouseClicked(PDFMouseEvent event) {
    }

    /**
     * Called when the mouse is moved on a page displayed in the viewport.
     * Only called if the type includes {@link #TYPE_MOUSEMOTION}
     */
    public void mouseMoved(PDFMouseEvent event) {
    }

    /**
     * Called when the mouse is dragged on a page displayed in the viewport.
     * Only called if the type includes {@link #TYPE_MOUSEMOTION}
     */
    public void mouseDragged(PDFMouseEvent event) {
    }

    /**
     * Called when a key is pressed in the viewport.
     * Only called if the type includes {@link #TYPE_KEYBOARD}
     */
    public void keyPressed(PDFKeyEvent event) {
    }

    /**
     * Called when a key is released in the viewport.
     * Only called if the type includes {@link #TYPE_KEYBOARD}
     */
    public void keyReleased(PDFKeyEvent event) {
    }

    /**
     * Called when a key is typed in the viewport.
     * Only called if the type includes {@link #TYPE_KEYBOARD}
     */
    public void keyTyped(PDFKeyEvent event) {
    }
}