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FormView.javaAPI DocJava SE 5 API32523Fri Aug 26 14:58:18 BST 2005javax.swing.text.html

FormView

public class FormView extends ComponentView implements ActionListener
Component decorator that implements the view interface for form elements, <input>, <textarea>, and <select>. The model for the component is stored as an attribute of the the element (using StyleConstants.ModelAttribute), and is used to build the component of the view. The type of the model is assumed to of the type that would be set by HTMLDocument.HTMLReader.FormAction. If there are multiple views mapped over the document, they will share the embedded component models.

The following table shows what components get built by this view.
Element Type Component built
input, type button JButton
input, type checkbox JCheckBox
input, type image JButton
input, type password JPasswordField
input, type radio JRadioButton
input, type reset JButton
input, type submit JButton
input, type text JTextField
select, size > 1 or multiple attribute defined JList in a JScrollPane
select, size unspecified or 1 JComboBox
textarea JTextArea in a JScrollPane
input, type file JTextField

author
Timothy Prinzing
author
Sunita Mani
version
1.28 05/27/05

Fields Summary
public static final String
SUBMIT
If a value attribute is not specified for a FORM input element of type "submit", then this default string is used.
public static final String
RESET
If a value attribute is not specified for a FORM input element of type "reset", then this default string is used.
private short
maxIsPreferred
Used to indicate if the maximum span should be the same as the preferred span. This is used so that the Component's size doesn't change if there is extra room on a line. The first bit is used for the X direction, and the second for the y direction.
Constructors Summary
public FormView(Element elem)
Creates a new FormView object.

param
elem the element to decorate


                    
       
	super(elem);
Methods Summary
public voidactionPerformed(java.awt.event.ActionEvent evt)
Responsible for processeing the ActionEvent. If the element associated with the FormView, has a type of "submit", "reset", "text" or "password" then the action is processed. In the case of a "submit" the form is submitted. In the case of a "reset" the form is reset to its original state. In the case of "text" or "password", if the element is the last one of type "text" or "password", the form is submitted. Otherwise, focus is transferred to the next component in the form.

param
evt the ActionEvent.

	Element element = getElement();
	StringBuffer dataBuffer = new StringBuffer();
	HTMLDocument doc = (HTMLDocument)getDocument();
	AttributeSet attr = element.getAttributes();
	
	String type = (String) attr.getAttribute(HTML.Attribute.TYPE);

	if (type.equals("submit")) { 
	    getFormData(dataBuffer);
	    submitData(dataBuffer.toString());
	} else if (type.equals("reset")) {
	    resetForm();
	} else if (type.equals("text") || type.equals("password")) {
	    if (isLastTextOrPasswordField()) {
		getFormData(dataBuffer);
		submitData(dataBuffer.toString());
	    } else {
		getComponent().transferFocus();
	    }
	}
private voidappendBuffer(java.lang.StringBuffer buffer, java.lang.String name, java.lang.String value)
Appends name / value pairs into the buffer. Both names and values are encoded using the URLEncoder.encode() method before being added to the buffer.

	if (buffer.length() > 0) {
	    buffer.append('&");
	}
	String encodedName = URLEncoder.encode(name);
	buffer.append(encodedName);
	buffer.append('=");
	String encodedValue = URLEncoder.encode(value);
	buffer.append(encodedValue);
protected java.awt.ComponentcreateComponent()
Create the component. This is basically a big switch statement based upon the tag type and html attributes of the associated element.

	AttributeSet attr = getElement().getAttributes();
	HTML.Tag t = (HTML.Tag) 
	    attr.getAttribute(StyleConstants.NameAttribute);
	JComponent c = null;
	Object model = attr.getAttribute(StyleConstants.ModelAttribute);
	if (t == HTML.Tag.INPUT) {
	    c = createInputComponent(attr, model);
	} else if (t == HTML.Tag.SELECT) {

	    if (model instanceof OptionListModel) {

		JList list = new JList((ListModel) model);
		int size = HTML.getIntegerAttributeValue(attr,
							 HTML.Attribute.SIZE,
							 1);
		list.setVisibleRowCount(size);
		list.setSelectionModel((ListSelectionModel)model);
		c = new JScrollPane(list);
	    } else {
		c = new JComboBox((ComboBoxModel) model);
                maxIsPreferred = 3;
	    }
	} else if (t == HTML.Tag.TEXTAREA) {
	    JTextArea area = new JTextArea((Document) model);
	    int rows = HTML.getIntegerAttributeValue(attr,
						     HTML.Attribute.ROWS,
						     1);
	    area.setRows(rows);
	    int cols = HTML.getIntegerAttributeValue(attr,
						     HTML.Attribute.COLS,
						     20);
            maxIsPreferred = 3;
	    area.setColumns(cols);
	    c = new JScrollPane(area, 
				JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
				JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
	}

	if (c != null) {
	    c.setAlignmentY(1.0f);
	}
	return c;
private javax.swing.JComponentcreateInputComponent(javax.swing.text.AttributeSet attr, java.lang.Object model)
Creates a component for an <INPUT> element based on the value of the "type" attribute.

param
set of attributes associated with the <INPUT> element.
param
model the value of the StyleConstants.ModelAttribute
return
the component.

	JComponent c = null;
	String type = (String) attr.getAttribute(HTML.Attribute.TYPE);

	if (type.equals("submit") || type.equals("reset")) {
	    String value = (String) 
		attr.getAttribute(HTML.Attribute.VALUE);
	    if (value == null) {
		if (type.equals("submit")) {
		    value = UIManager.getString("FormView.submitButtonText");
		} else {
		    value = UIManager.getString("FormView.resetButtonText");
		}
	    }
	    JButton button = new JButton(value);
	    if (model != null) {
		button.setModel((ButtonModel)model);
		button.addActionListener(this);
	    }
	    c = button;
            maxIsPreferred = 3;
	} else if (type.equals("image")) {
	    String srcAtt = (String) attr.getAttribute(HTML.Attribute.SRC);
	    JButton button;
	    try {
		URL base = ((HTMLDocument)getElement().getDocument()).getBase();
		URL srcURL = new URL(base, srcAtt);
		Icon icon = new ImageIcon(srcURL);
		button  = new JButton(icon);
	    } catch (MalformedURLException e) {
		button = new JButton(srcAtt);
	    }
	    if (model != null) {
		button.setModel((ButtonModel)model);
		button.addMouseListener(new MouseEventListener());
	    }
	    c = button;
            maxIsPreferred = 3;
	} else if (type.equals("checkbox")) {
	    c = new JCheckBox();
	    if (model != null) {
		((JCheckBox)c).setModel((JToggleButton.ToggleButtonModel) model);
	    }
            maxIsPreferred = 3;
	} else if (type.equals("radio")) {
	    c = new JRadioButton();
	    if (model != null) {
		((JRadioButton)c).setModel((JToggleButton.ToggleButtonModel)model);
	    }
            maxIsPreferred = 3;
	} else if (type.equals("text")) {
	    int size = HTML.getIntegerAttributeValue(attr,
						     HTML.Attribute.SIZE,
						     -1);
	    JTextField field;
	    if (size > 0) {
		field = new JTextField();
		field.setColumns(size);
	    }
	    else {
		field = new JTextField();
		field.setColumns(20);
	    }
	    c = field;
	    if (model != null) {
		field.setDocument((Document) model);
	    }
	    field.addActionListener(this);
            maxIsPreferred = 3;
	} else if (type.equals("password")) {
	    JPasswordField field = new JPasswordField();
	    c = field;
	    if (model != null) {
		field.setDocument((Document) model);
	    }
	    int size = HTML.getIntegerAttributeValue(attr,
						     HTML.Attribute.SIZE,
						     -1);
            field.setColumns((size > 0) ? size : 20);
	    field.addActionListener(this);
            maxIsPreferred = 3;
	} else if (type.equals("file")) {
            JTextField field = new JTextField();
	    if (model != null) {
		field.setDocument((Document)model);
	    }
	    int size = HTML.getIntegerAttributeValue(attr, HTML.Attribute.SIZE,
						     -1);
            field.setColumns((size > 0) ? size : 20);
            JButton browseButton = new JButton(UIManager.getString
                                           ("FormView.browseFileButtonText"));
            Box box = Box.createHorizontalBox();
            box.add(field);
            box.add(Box.createHorizontalStrut(5));
            box.add(browseButton);
            browseButton.addActionListener(new BrowseFileAction(
                                           attr, (Document)model));
            c = box;
            maxIsPreferred = 3;
        }
	return c;
voidgetFormData(java.lang.StringBuffer buffer)
Iterates over the element hierarchy, extracting data from the models associated with the relevant form elements. "Relevant" means the form elements that are part of the same form whose element triggered the submit action.

param
buffer the buffer that contains that data to submit
param
targetElement the element that triggered the form submission

        Element formE = getFormElement();
        if (formE != null) {
            ElementIterator it = new ElementIterator(formE);
            Element next;

            while ((next = it.next()) != null) {
                if (isControl(next)) {
                    String type = (String)next.getAttributes().getAttribute
                                       (HTML.Attribute.TYPE);

                    if (type != null && type.equals("submit") && 
                        next != getElement()) {
                        // do nothing - this submit isnt the trigger
                    } else if (type == null || !type.equals("image")) {
                        // images only result in data if they triggered
                        // the submit and they require that the mouse click
                        // coords be appended to the data.  Hence its
                        // processing is handled by the view.
                        loadElementDataIntoBuffer(next, buffer);
                    }
                }
            }
        }
private javax.swing.text.ElementgetFormElement()
Returns the Element representing the FORM.

        Element elem = getElement();
        while (elem != null) {
            if (elem.getAttributes().getAttribute
                (StyleConstants.NameAttribute) == HTML.Tag.FORM) {
                return elem;
            }
            elem = elem.getParentElement();
        }
        return null;
private java.lang.StringgetImageData(java.awt.Point point)
Extracts the value of the name attribute associated with the input element of type image. If name is defined it is encoded using the URLEncoder.encode() method and the image data is returned in the following format: name + ".x" +"="+ x +"&"+ name +".y"+"="+ y otherwise, "x="+ x +"&y="+ y

param
point associated with the mouse click.
return
the image data.

	    
	String mouseCoords = point.x + ":" + point.y;
	int sep = mouseCoords.indexOf(':");
	String x = mouseCoords.substring(0, sep);
	String y = mouseCoords.substring(++sep);
	String name = (String) getElement().getAttributes().getAttribute(HTML.Attribute.NAME);
	
	String data;
	if (name == null || name.equals("")) {
	    data = "x="+ x +"&y="+ y;
	} else {
	    name = URLEncoder.encode(name);
	    data = name + ".x" +"="+ x +"&"+ name +".y"+"="+ y;
	}
	return data;
private java.lang.StringgetInputElementData(javax.swing.text.AttributeSet attr)
Returns the data associated with an <INPUT> form element. The value of "type" attributes is used to determine the type of the model associated with the element and then the relevant data is extracted.

	
	Object model = attr.getAttribute(StyleConstants.ModelAttribute);
	String type = (String) attr.getAttribute(HTML.Attribute.TYPE);
	String value = null;
	
	if (type.equals("text") || type.equals("password")) {
	    Document doc = (Document)model;
	    try {
		value = doc.getText(0, doc.getLength());
	    } catch (BadLocationException e) {
		value = null;
	    }
	} else if (type.equals("submit") || type.equals("hidden")) {
	    value = (String) attr.getAttribute(HTML.Attribute.VALUE);
	    if (value == null) {
		value = "";
	    }
	} else if (type.equals("radio") || type.equals("checkbox")) {
	    ButtonModel m = (ButtonModel)model;
	    if (m.isSelected()) {
		value = (String) attr.getAttribute(HTML.Attribute.VALUE);
		if (value == null) {
		    value = "on";
		}
	    }
	} else if (type.equals("file")) {
	    Document doc = (Document)model;
            String path;

	    try {
		path = doc.getText(0, doc.getLength());
	    } catch (BadLocationException e) {
		path = null;
	    }
            if (path != null && path.length() > 0) {
                value = path;
/*

                try {
                    Reader reader = new BufferedReader(new FileReader(path));
                    StringBuffer buffer = new StringBuffer();
                    char[] cBuff = new char[1024];
                    int read;

                    try {
                        while ((read = reader.read(cBuff)) != -1) {
                            buffer.append(cBuff, 0, read);
                        }
                    } catch (IOException ioe) {
                        buffer = null;
                    }
                    try {
                        reader.close();
                    } catch (IOException ioe) {}
                    if (buffer != null) {
                        value = buffer.toString();
                    }
                } catch (IOException ioe) {}
*/
            }
        }
	return value;
public floatgetMaximumSpan(int axis)
Determines the maximum span for this view along an axis. For certain components, the maximum and preferred span are the same. For others this will return the value returned by Component.getMaximumSize along the axis of interest.

param
axis may be either View.X_AXIS or View.Y_AXIS
return
the span the view would like to be rendered into >= 0. Typically the view is told to render into the span that is returned, although there is no guarantee. The parent may choose to resize or break the view.
exception
IllegalArgumentException for an invalid axis

        switch (axis) {
        case View.X_AXIS:
            if ((maxIsPreferred & 1) == 1) {
                super.getMaximumSpan(axis);
                return getPreferredSpan(axis);
            }
            return super.getMaximumSpan(axis);
        case View.Y_AXIS:
            if ((maxIsPreferred & 2) == 2) {
                super.getMaximumSpan(axis);
                return getPreferredSpan(axis);
            }
            return super.getMaximumSpan(axis);
        default:
            break;
        }
        return super.getMaximumSpan(axis);
private java.lang.StringgetTextAreaData(javax.swing.text.AttributeSet attr)
Returns the data associated with the <TEXTAREA> form element. This is done by getting the text stored in the Document model.

	Document doc = (Document)attr.getAttribute(StyleConstants.ModelAttribute);
	try {
	    return doc.getText(0, doc.getLength());
	} catch (BadLocationException e) {
	    return null;
	}
protected voidimageSubmit(java.lang.String imageData)
This method is called to submit a form in response to a click on an image -- an <INPUT> form element of type "image".

param
imageData the mouse click coordinates.


	StringBuffer dataBuffer = new StringBuffer();
	Element elem = getElement();
	HTMLDocument hdoc = (HTMLDocument)elem.getDocument();
	getFormData(dataBuffer);
	if (dataBuffer.length() > 0) {
	    dataBuffer.append('&");
	}
	dataBuffer.append(imageData);
	submitData(dataBuffer.toString());
	return;
private booleanisControl(javax.swing.text.Element elem)
Returns true if the Element elem represents a control.

        return elem.isLeaf();
booleanisLastTextOrPasswordField()
Iterates over the element hierarchy to determine if the element parameter, which is assumed to be an <INPUT> element of type password or text, is the last one of either kind, in the form to which it belongs.

        Element parent = getFormElement();
        Element elem = getElement();

        if (parent != null) {
            ElementIterator it = new ElementIterator(parent);
            Element next;
            boolean found = false;

            while ((next = it.next()) != null) {
                if (next == elem) {
                    found = true;
                }
                else if (found && isControl(next)) {
                    AttributeSet elemAttr = next.getAttributes();

                    if (HTMLDocument.matchNameAttribute
                                     (elemAttr, HTML.Tag.INPUT)) {
                        String type = (String)elemAttr.getAttribute
                                                  (HTML.Attribute.TYPE);

                        if ("text".equals(type) || "password".equals(type)) {
                            return false;
                        }
                    }
                }
            }
        }
        return true;
private voidloadElementDataIntoBuffer(javax.swing.text.Element elem, java.lang.StringBuffer buffer)
Loads the data associated with the element into the buffer. The format in which data is appended depends on the type of the form element. Essentially data is loaded in name/value pairs.


	AttributeSet attr = elem.getAttributes();
	String name = (String)attr.getAttribute(HTML.Attribute.NAME);
	if (name == null) {
	    return;
 	}
	String value = null;
	HTML.Tag tag = (HTML.Tag)elem.getAttributes().getAttribute
                                  (StyleConstants.NameAttribute);

	if (tag == HTML.Tag.INPUT) {
	    value = getInputElementData(attr);
	} else if (tag ==  HTML.Tag.TEXTAREA) {
	    value = getTextAreaData(attr);
	} else if (tag == HTML.Tag.SELECT) {
	    loadSelectData(attr, buffer);
	}
	
	if (name != null && value != null) {
	    appendBuffer(buffer, name, value);
	}
private voidloadSelectData(javax.swing.text.AttributeSet attr, java.lang.StringBuffer buffer)
Loads the buffer with the data associated with the Select form element. Basically, only items that are selected and have their name attribute set are added to the buffer.


	String name = (String)attr.getAttribute(HTML.Attribute.NAME);
	if (name == null) {
	    return;
	}
	Object m = attr.getAttribute(StyleConstants.ModelAttribute);
	if (m instanceof OptionListModel) {
	    OptionListModel model = (OptionListModel)m;
	    
	    for (int i = 0; i < model.getSize(); i++) {
		if (model.isSelectedIndex(i)) {
		    Option option = (Option) model.getElementAt(i);
		    appendBuffer(buffer, name, option.getValue());
		}
	    }
	} else if (m instanceof ComboBoxModel) {
	    ComboBoxModel model = (ComboBoxModel)m;
	    Option option = (Option)model.getSelectedItem();
	    if (option != null) {
		appendBuffer(buffer, name, option.getValue());
	    }
	}
voidresetForm()
Resets the form to its initial state by reinitializing the models associated with each form element to their initial values. param elem the element that triggered the reset

        Element parent = getFormElement();

        if (parent != null) {
            ElementIterator it = new ElementIterator(parent);
            Element next;

            while((next = it.next()) != null) {
                if (isControl(next)) {
                    AttributeSet elemAttr = next.getAttributes();
                    Object m = elemAttr.getAttribute(StyleConstants.
                                                     ModelAttribute);
                    if (m instanceof TextAreaDocument) {
                        TextAreaDocument doc = (TextAreaDocument)m;
                        doc.reset();
                    } else if (m instanceof PlainDocument) {
                        try {
                            PlainDocument doc =  (PlainDocument)m;
                            doc.remove(0, doc.getLength());
                            if (HTMLDocument.matchNameAttribute
                                             (elemAttr, HTML.Tag.INPUT)) {
                                String value = (String)elemAttr.
                                           getAttribute(HTML.Attribute.VALUE);
                                if (value != null) {
                                    doc.insertString(0, value, null);
                                }
                            }
                        } catch (BadLocationException e) {
                        }
                    } else if (m instanceof OptionListModel) {
                        OptionListModel model = (OptionListModel) m;
                        int size = model.getSize();
                        for (int i = 0; i < size; i++) {
                            model.removeIndexInterval(i, i);
                        }
                        BitSet selectionRange = model.getInitialSelection();
                        for (int i = 0; i < selectionRange.size(); i++) {
                            if (selectionRange.get(i)) {
                                model.addSelectionInterval(i, i);
                            }
                        }
                    } else if (m instanceof OptionComboBoxModel) {
                        OptionComboBoxModel model = (OptionComboBoxModel) m;
                        Option option = model.getInitialSelection();
                        if (option != null) {
                            model.setSelectedItem(option);
                        }
                    } else if (m instanceof JToggleButton.ToggleButtonModel) {
                        boolean checked = ((String)elemAttr.getAttribute
                                           (HTML.Attribute.CHECKED) != null);
                        JToggleButton.ToggleButtonModel model =
                                        (JToggleButton.ToggleButtonModel)m;
                        model.setSelected(checked);
                    }
                }
            }
        }
protected voidsubmitData(java.lang.String data)
This method is responsible for submitting the form data. A thread is forked to undertake the submission.

	//System.err.println("data ->"+data+"<-");
	SubmitThread dataThread = new SubmitThread(getElement(), data);
	dataThread.start();