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FrameView.javaAPI DocJava SE 5 API12378Fri Aug 26 14:58:18 BST 2005javax.swing.text.html

FrameView

public class FrameView extends ComponentView implements HyperlinkListener
Implements a FrameView, intended to support the HTML <FRAME> tag. Supports the frameborder, scrolling, marginwidth and marginheight attributes.
author
Sunita Mani
version
1.28, 12/19/03

Fields Summary
JEditorPane
htmlPane
JScrollPane
scroller
boolean
editable
float
width
float
height
URL
src
private boolean
createdComponent
Set to true when the component has been created.
Constructors Summary
public FrameView(Element elem)
Creates a new Frame.

param
elem the element to represent.

	super(elem);
    
Methods Summary
public voidchangedUpdate(javax.swing.event.DocumentEvent e, java.awt.Shape a, javax.swing.text.ViewFactory f)
Gives notification from the document that attributes were changed in a location that this view is responsible for. Currently this view handles changes to its SRC attribute.

param
e the change information from the associated document
param
a the current allocation of the view
param
f the factory to use to rebuild if the view has children


	Element elem = getElement();
	AttributeSet attributes = elem.getAttributes();

	URL oldPage = src;

	String srcAtt = (String)attributes.getAttribute(HTML.Attribute.SRC);
	URL base = ((HTMLDocument)elem.getDocument()).getBase();
	try {
	    src = new URL(base, srcAtt);
	    if (!createdComponent) {
		return;
	    }
	    if (oldPage.equals(src) && (src.getRef() == null)) {
		return;
	    }
	    htmlPane.setPage(src);
	    Document newDoc = htmlPane.getDocument();
	    if (newDoc instanceof HTMLDocument) {
		((HTMLDocument)newDoc).setFrameDocumentState(true);
	    }
	} catch (MalformedURLException e1) {
	    // Need a way to handle exceptions
	    //e1.printStackTrace();
	} catch (IOException e2) {
	    // Need a way to handle exceptions
	    //e2.printStackTrace();
	}
    
protected java.awt.ComponentcreateComponent()


	Element elem = getElement();
	AttributeSet attributes = elem.getAttributes();
	String srcAtt = (String)attributes.getAttribute(HTML.Attribute.SRC);

	if ((srcAtt != null) && (!srcAtt.equals(""))) {
	    try {
		URL base = ((HTMLDocument)elem.getDocument()).getBase();
		src = new URL(base, srcAtt);
                htmlPane = new FrameEditorPane();
                htmlPane.addHyperlinkListener(this);
                JEditorPane host = getHostPane();
                boolean isAutoFormSubmission = true;
                if (host != null) {
                    htmlPane.setEditable(host.isEditable());
		    String charset = (String) host.getClientProperty("charset");
		    if (charset != null) {
			htmlPane.putClientProperty("charset", charset);
		    }
                    HTMLEditorKit hostKit = (HTMLEditorKit)host.getEditorKit();
		    if (hostKit != null) {
			isAutoFormSubmission = hostKit.isAutoFormSubmission();
		    }
                }
                htmlPane.setPage(src);
                HTMLEditorKit kit = (HTMLEditorKit)htmlPane.getEditorKit();
		if (kit != null) {
		    kit.setAutoFormSubmission(isAutoFormSubmission);
		}

		Document doc = htmlPane.getDocument();
		if (doc instanceof HTMLDocument) {
		    ((HTMLDocument)doc).setFrameDocumentState(true);
		}
		setMargin();
		createScrollPane();
		setBorder();
	    } catch (MalformedURLException e) {
		e.printStackTrace();
	    } catch (IOException e1) {
		e1.printStackTrace();
	    }
	}
	createdComponent = true;
	return scroller;
    
private voidcreateScrollPane()
This method creates the JScrollPane. The scrollbar policy is determined by the scrolling attribute. If not defined, the default is "auto" which maps to the scrollbar's being displayed as needed.

	AttributeSet attributes = getElement().getAttributes();
	String scrolling = (String)attributes.getAttribute(HTML.Attribute.SCROLLING);
	if (scrolling == null) {
	    scrolling = "auto";
	}
	
	if (!scrolling.equals("no")) {
	    if (scrolling.equals("yes")) {
		scroller = new JScrollPane(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, 
					   JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
	    } else {
		// scrollbars will be displayed if needed
		//
		scroller = new JScrollPane();
	    } 
	} else {
	    scroller = new JScrollPane(JScrollPane.VERTICAL_SCROLLBAR_NEVER, 
				       JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
	}

	JViewport vp = scroller.getViewport();
	vp.add(htmlPane);
	vp.setBackingStoreEnabled(true);
	scroller.setMinimumSize(new Dimension(5,5));
	scroller.setMaximumSize(new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE));
    
javax.swing.JEditorPanegetHostPane()

	Container c = getContainer();
	while ((c != null) && ! (c instanceof JEditorPane)) {
	    c = c.getParent();
	}
	return (JEditorPane) c;
    
public floatgetMaximumSpan(int axis)
Determines the maximum span for this view along an axis.

param
axis may be either View.X_AXIS or View.Y_AXIS
return
the preferred span; given that we do not support resizing of frames, the maximum span returned is the same as the preferred span

	return Integer.MAX_VALUE;
    
public floatgetMinimumSpan(int axis)
Determines the minimum span for this view along an axis.

param
axis may be either View.X_AXIS or View.Y_AXIS
return
the preferred span; given that we do not support resizing of frames, the minimum span returned is the same as the preferred span

      return 5;
    
private javax.swing.JEditorPanegetOutermostJEditorPane()
Finds the outermost FrameSetView. It then returns that FrameSetView's container.


	View parent = getParent();
	FrameSetView frameSetView = null;
	while (parent != null) {
	    if (parent instanceof FrameSetView) {
		frameSetView = (FrameSetView)parent;
	    }
	    parent = parent.getParent();
	}
	if (frameSetView != null) {
	    return (JEditorPane)frameSetView.getContainer();
	}
	return null;
    
public voidhyperlinkUpdate(javax.swing.event.HyperlinkEvent evt)
Notification of a change relative to a hyperlink. This method searches for the outermost JEditorPane, and then fires an HTMLFrameHyperlinkEvent to that frame. In addition, if the target is _parent, and there is not nested framesets then the target is reset to _top. If the target is _top, in addition to firing the event to the outermost JEditorPane, this method also invokes the setPage() method and explicitly replaces the current document with the destination url.

param
HyperlinkEvent


	JEditorPane c = getOutermostJEditorPane();
	if (c == null) {
	    return;
	}

	if (!(evt instanceof HTMLFrameHyperlinkEvent)) {
	    c.fireHyperlinkUpdate(evt);
	    return;
	}

	HTMLFrameHyperlinkEvent e = (HTMLFrameHyperlinkEvent)evt;

	if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
	    String target = e.getTarget();

	    if (e.getTarget().equals("_parent") && !inNestedFrameSet()){ 
		target = "_top";
	    }

            if (evt instanceof FormSubmitEvent) {
                HTMLEditorKit kit = (HTMLEditorKit)c.getEditorKit();
                if (kit != null && kit.isAutoFormSubmission()) {
		    if (target.equals("_top")) {
			try {
			    c.setPage(e.getURL());
			} catch (IOException ex) {
			    // Need a way to handle exceptions
			}
		    } else {
			HTMLDocument doc = (HTMLDocument)c.getDocument();
			doc.processHTMLFrameHyperlinkEvent(e);
		    }
                } else {
                    c.fireHyperlinkUpdate(evt);
                }
                return;
            }

	    if (target.equals("_top")) {
		try {
		    c.setPage(e.getURL());
		} catch (IOException ex) {
		    // Need a way to handle exceptions
		    // ex.printStackTrace();
		}
	    }
	    if (!c.isEditable()) {
		c.fireHyperlinkUpdate(new HTMLFrameHyperlinkEvent(c,
								  e.getEventType(), 
								  e.getURL(), 
								  e.getDescription(),
								  getElement(),
								  target));
	    }
	}
    
private booleaninNestedFrameSet()
Returns true if this frame is contained within a nested frameset.

	FrameSetView parent = (FrameSetView)getParent();
	return (parent.getParent() instanceof FrameSetView);
    
public voidpaint(java.awt.Graphics g, java.awt.Shape allocation)
Also determines if the FrameView should be editable or not based on whether the JTextComponent that contains it is editable. And then proceeds to call the superclass to do the paint().

param
parent View
see
text.ComponentView#paint


	Container host = getContainer();
	if (host != null && htmlPane != null &&
	    htmlPane.isEditable() != ((JTextComponent)host).isEditable()) {
	    editable = ((JTextComponent)host).isEditable();
	    htmlPane.setEditable(editable);
	}
        super.paint(g, allocation);
    
private voidsetBorder()
If the frameborder attribute has been specified, either in the frame, or by the frames enclosing frameset, the JScrollPane's setBorder() method is invoked to achieve the desired look.


	AttributeSet attributes = getElement().getAttributes();
	String frameBorder = (String)attributes.getAttribute(HTML.Attribute.FRAMEBORDER);
	if ((frameBorder != null) && 
	    (frameBorder.equals("no") || frameBorder.equals("0"))) {
	    // make invisible borders.
	    scroller.setBorder(null);
	}
    
private voidsetMargin()
If the marginwidth or marginheight attributes have been specified, then the JEditorPane's margin's are set to the new values.

	int margin = 0;
	Insets in = htmlPane.getMargin();
	Insets newInsets;
	boolean modified = false;
	AttributeSet attributes = getElement().getAttributes();
	String marginStr = (String)attributes.getAttribute(HTML.Attribute.MARGINWIDTH);
	if ( in != null) {
	    newInsets = new Insets(in.top, in.left, in.right, in.bottom);
	} else {
	    newInsets = new Insets(0,0,0,0);
	}
	if (marginStr != null) {
	    margin = Integer.parseInt(marginStr);
	    if (margin > 0) {
		newInsets.left = margin;
		newInsets.right = margin;
		modified = true;
	    }
	}
	marginStr = (String)attributes.getAttribute(HTML.Attribute.MARGINHEIGHT);
	if (marginStr != null) {
	    margin = Integer.parseInt(marginStr);
	    if (margin > 0) {
		newInsets.top = margin;
		newInsets.bottom = margin;
		modified = true;
	    }
	}
	if (modified) {
	    htmlPane.setMargin(newInsets);
	}
    
public voidsetParent(javax.swing.text.View parent)
Sets the parent view for the FrameView. Also determines if the FrameView should be editable or not based on whether the JTextComponent that contains it is editable.

param
parent View

	if (parent != null) {
	    JTextComponent t = (JTextComponent)parent.getContainer();
	    editable = t.isEditable();
	}
	super.setParent(parent);