/*
* $Id: MDIApplication.java,v 1.16 2006/03/28 23:56:01 cxh Exp $
*
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*/
package diva.gui.tutorial;
import java.util.HashMap;
import javax.swing.JComponent;
import diva.gui.Document;
import diva.gui.MDIContext;
import diva.gui.View;
import diva.gui.ViewAdapter;
import diva.gui.ViewEvent;
/**
* An abstract superclass for applications that use an MDI (multiple
* document interface) style of presentation. This class manages the
* interaction between documents of the application, and the frame
* that they are displayed in. For example, keeping documents and
* views in sync, handling focus changes, and so on.
*
* The context must implement MDIContext for this to work properly.
*
* Note: this application only manages one view per document.
* If you have multiple views per document, you will need to
* implement the view-document mapping yourself.
*
* @author John Reekie
* @version $Id: MDIApplication.java,v 1.16 2006/03/28 23:56:01 cxh Exp $
*/
public abstract class MDIApplication extends AbstractApplication {
// This class used to be in the parent directory, but only the
// tutorial needed it, so we moved it.
/** A mapping from content panes to views
*/
private HashMap _viewMap = new HashMap();
/** Create an MDI application in the given MDI context
*/
public MDIApplication(MDIContext context) {
super(context);
context.addViewListener(new MDIViewListener());
}
public void addView(View v) {
super.addView(v);
JComponent component = v.getComponent();
// Add the component to the frame
getMDIContext().addContentPane(v.getTitle(), component);
// Yuk we need hash tables to map components to views ek
_viewMap.put(component, v);
}
/** Given a document, create a new view which displays that
* document. Subclasses must implement this method to
* create, initialize, and then return a View object that
* wraps a JComponent.
*/
public abstract View createView(Document d);
/** Get the MDI frame -- type-specific version of
* getApplicationFrame().
*/
public MDIContext getMDIContext() {
return (MDIContext) getAppContext();
}
/** Get the Document displayed by the given component.
*/
public View getView(JComponent c) {
return (View) _viewMap.get(c);
}
/** Remove a view from the list of view currently known by this
* application. Fire a document list event to registered
* listeners. Throw an exception if the document is not known.
* This method assumes that setCurrentView will be called
* subsequently on another view.
*/
public void removeView(View v) {
super.removeView(v);
// Remove the display.
JComponent pane = v.getComponent();
_viewMap.remove(pane);
//FIXME do this last, to avoid circular loop
// with the viewClosing callback
getMDIContext().removeContentPane(pane);
}
/** Set the given document to be the current document, and raise
* the internal window that corresponds to that component.
*/
public void setCurrentView(View v) {
super.setCurrentView(v);
if (v != null) {
getMDIContext().setCurrentContentPane(v.getComponent());
}
}
private class MDIViewListener extends ViewAdapter {
public void viewSelected(ViewEvent e) {
JComponent jc = e.getView();
View view = getView(jc);
// FIXME: for some reason, closing
// a view also causes that view
// to be selected after it is
// closed?
if (viewList().contains(view)) {
// Prevent recursion
if (getCurrentView() != view) {
setCurrentView(view);
}
}
}
public void viewClosing(ViewEvent e) {
JComponent jc = e.getView();
View view = getView(jc);
// FIXME: avoid circular loop with the
// removeDocument method (if the
// file is closed from the menu,
// rather than by clicking the X in
// the internal pane
if (viewList().contains(view)) {
closeView(view);
//workaround for combobox model bug
setCurrentView(getCurrentView());
}
}
}
}