public ComponentView(Element elem) 
{
        super(elem);
}

Creates a new ComponentView object.

Parameters:

elem - the element to decorate

 protected Component createComponent() 
{
        AttributeSet attr = getElement().getAttributes();
        Component comp = StyleConstants.getComponent(attr);
        return comp;
}

Create the component that is associated with this view. This will be called when it has been determined that a new component is needed. This would result from a call to setParent or as a result of being notified that attributes have changed.

 public float getAlignment(int axis) 
{
        if (c != null) {
            switch (axis) {
            case View.X_AXIS:
                return c.getAlignmentX();
            case View.Y_AXIS:
                return c.getAlignmentY();
            }
        }
        return super.getAlignment(axis);
}

Determines the desired alignment for this view along an axis. This is implemented to give the alignment of the embedded component.

 public final Component getComponent() 
{
        return createdC;
}

Fetch the component associated with the view.

 public float getMaximumSpan(int axis) 
{
        if ((axis != X_AXIS) && (axis != Y_AXIS)) {
            throw new IllegalArgumentException("Invalid axis: " + axis);
        }
        if (c != null) {
            Dimension size = c.getMaximumSize();
            if (axis == View.X_AXIS) {
                return size.width;
            } else {
                return size.height;
            }
        }
        return 0;
}

Determines the maximum span for this view along an axis. This is implemented to return the value returned by Component.getMaximumSize along the axis of interest.

 public float getMinimumSpan(int axis) 
{
        if ((axis != X_AXIS) && (axis != Y_AXIS)) {
            throw new IllegalArgumentException("Invalid axis: " + axis);
        }
        if (c != null) {
            Dimension size = c.getMinimumSize();
            if (axis == View.X_AXIS) {
                return size.width;
            } else {
                return size.height;
            }
        }
        return 0;
}

Determines the minimum span for this view along an axis. This is implemented to return the value returned by Component.getMinimumSize along the axis of interest.

 public float getPreferredSpan(int axis) 
{
        if ((axis != X_AXIS) && (axis != Y_AXIS)) {
            throw new IllegalArgumentException("Invalid axis: " + axis);
        }
        if (c != null) {
            Dimension size = c.getPreferredSize();
            if (axis == View.X_AXIS) {
                return size.width;
            } else {
                return size.height;
            }
        }
        return 0;
}

Determines the preferred span for this view along an axis. This is implemented to return the value returned by Component.getPreferredSize along the axis of interest.

 public Shape modelToView(int pos,
    Shape a,
    Bias b) throws BadLocationException 
{
        int p0 = getStartOffset();
        int p1 = getEndOffset();
        if ((pos  >= p0) && (pos < = p1)) {
            Rectangle r = a.getBounds();
            if (pos == p1) {
                r.x += r.width;
            }
            r.width = 0;
            return r;
        }
        throw new BadLocationException(pos + " not in range " + p0 + "," + p1, pos);
}

Provides a mapping from the coordinate space of the model to that of the view.

 public  void paint(Graphics g,
    Shape a) 
{
        if (c != null) {
            Rectangle alloc = (a instanceof Rectangle) ?
                (Rectangle) a : a.getBounds();
            c.setBounds(alloc.x, alloc.y, alloc.width, alloc.height);
        }
}

The real paint behavior occurs naturally from the association that the component has with its parent container (the same container hosting this view). This is implemented to do nothing.

  void setComponentParent() 
{
        View p = getParent();
        if (p != null) {
            Container parent = getContainer();
            if (parent != null) {
                if (c == null) {
                    // try to build a component
                    Component comp = createComponent();
                    if (comp != null) {
                        createdC = comp;
                        c = new Invalidator(comp);
                    }
                }
                if (c != null) {
                    if (c.getParent() == null) {
                        // components associated with the View tree are added
                        // to the hosting container with the View as a constraint.
                        parent.add(c, this);
                        parent.addPropertyChangeListener("enabled", c);
                    }
                }
            }
        } else {
            if (c != null) {
                Container parent = c.getParent();
                if (parent != null) {
                    // remove the component from its hosting container
                    parent.remove(c);
                    parent.removePropertyChangeListener("enabled", c);
                }
            }
        }
}

Set the parent of the embedded component with assurance that it is thread-safe.

 public  void setParent(View p) 
{
        super.setParent(p);
        if (SwingUtilities.isEventDispatchThread()) {
            setComponentParent();
        } else {
            Runnable callSetComponentParent = new Runnable() {
                public void run() {
                    Document doc = getDocument();
                    try {
                        if (doc instanceof AbstractDocument) {
                            ((AbstractDocument)doc).readLock();
                        }
                        setComponentParent();
                        Container host = getContainer();
                        if (host != null) {
                            preferenceChanged(null, true, true);
                            host.repaint();
                        }
                    } finally {
                        if (doc instanceof AbstractDocument) {
                            ((AbstractDocument)doc).readUnlock();
                        }
                    }
                }
            };
            SwingUtilities.invokeLater(callSetComponentParent);
        }
}

Sets the parent for a child view. The parent calls this on the child to tell it who its parent is, giving the view access to things like the hosting Container. The superclass behavior is executed, followed by a call to createComponent if the parent view parameter is non-null and a component has not yet been created. The embedded components parent is then set to the value returned by getContainer. If the parent view parameter is null, this view is being cleaned up, thus the component is removed from its parent.

The changing of the component hierarchy will touch the component lock, which is the one thing that is not safe from the View hierarchy. Therefore, this functionality is executed immediately if on the event thread, or is queued on the event queue if called from another thread (notification of change from an asynchronous update).

 public int viewToModel(float x,
    float y,
    Shape a,
    Bias[] bias) 
{
        Rectangle alloc = (Rectangle) a;
        if (x <  alloc.x + (alloc.width / 2)) {
            bias[0] = Position.Bias.Forward;
            return getStartOffset();
        }
        bias[0] = Position.Bias.Backward;
        return getEndOffset();
}

Provides a mapping from the view coordinate space to the logical coordinate space of the model.