📄 inputactionhandler.java
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// (c) 2003 Allen I Holub. All rights reserved.
package com.holub.ui.HTML;
import java.util.Properties;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
/***
* Handle the inputAction tag for an {@link HTMLPane}. Tag syntax is:
* <PRE>
* <inputAction name="fred" value="Button Text">
* </PRE>
*
* <!-- ====================== distribution terms ===================== -->
* <p><blockquote
* style="border-style: solid; border-width:thin; padding: 1em 1em 1em 1em;">
* <center>
* Copyright © 2003, Allen I. Holub. All rights reserved.
* </center>
* <br>
* <br>
* This code is distributed under the terms of the
* <a href="http://www.gnu.org/licenses/gpl.html"
* >GNU Public License</a> (GPL)
* with the following ammendment to section 2.c:
* <p>
* As a requirement for distributing this code, your splash screen,
* about box, or equivalent must include an my name, copyright,
* <em>and URL</em>. An acceptable message would be:
* <center>
* This program contains Allen Holub's <em>XXX</em> utility.<br>
* (c) 2003 Allen I. Holub. All Rights Reserved.<br>
* http://www.holub.com<br>
* </center>
* If your progam does not run interactively, then the foregoing
* notice must appear in your documentation.
* </blockquote>
* <!-- =============================================================== -->
* @author Allen I. Holub
*/
public class InputActionHandler implements TagHandler
{
private final HTMLPane pane;
InputActionHandler( HTMLPane pane ){ this.pane=pane; }
// This method is called when the <inputAction...> tag is
// first processed, when the HTML input is imported into
// the HTMLPane.
//
public JComponent handleTag(HTMLPane source, Properties attributes)
{
final String name = attributes.getProperty("name");
final String value = attributes.getProperty("value");
// Pressed must be declared final because it's accessed
// from an inner-class object. Implement it as a one-element
// array so that it can nonetheless be modified.
//
final boolean pressed[] = new boolean[]{ false } ;
// This class is the JComponent that will appear on the
// screen in place of the tag.
//
class ButtonTag extends JButton implements TagBehavior
{ ButtonTag(String text){ super(text); }
public void reset(){}
public void destroy(){}
// Called by the HTMLPane when it assembles the
// Properties object that holds the form data
// in order to send that data to its listeners.
//
public String getFormData()
{
// If the button is pressed, the form data holds
// a name=value pair that holds the value "true"
// The name is specified in the tag.
return (name == null)
? ""
: (name + "=" + pressed[0])
;
}
}
ButtonTag proxy = new ButtonTag(value);
proxy.setAlignmentY( HTMLPane.BASELINE_ALIGNMENT );
// Set up to handle the button click. Set the "pressed"
// state true and call HTMLPane's handleInputActionTag(...)
// method, which gathers up the form data and sends it
// to the HTMLPane's listeners with an actionPerformed(...)
// message. The form data for the "proxy" is fetched
// from the ButtonTag object's getFormData(...) method,
// declared about 10 lines up.
//
proxy.addActionListener
( new ActionListener()
{ public void actionPerformed( ActionEvent e )
{ pressed[0]=true;
pane.handleInputActionTag(name);
}
}
);
return proxy;
}
private static class Test
{ public static void main( String[] args )
{ HTMLPane pane = new HTMLPane(true);
pane.addActionListener
( new ActionListener()
{ public void actionPerformed(ActionEvent e)
{ HTMLPane.FormActionEvent
event = (HTMLPane.FormActionEvent)e;
event.data().list( System.out );
}
}
);
pane.addTag( "inputDate", new InputDateHandler() );
pane.setText
( "<html>"
+ "<head>"
+ "</head>"
+ "<body>"
+ "<inputAction name=myName value=\"initialValue\" >"
+ "<form>"
+ "<table border=1>"
+ "<tr><td> Input Action: </td><td align=left> <inputAction name=myName value=\"initialValue\" > </td></tr>"
+ "</table>"
+ "<br><input type=submit value=Submit>"
+ "</form>"
+ "</body>"
+ "</html>"
);
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add( pane );
frame.pack();
frame.show();
}
}
}
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