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package javax.swing.text;
import java.awt.*;
import javax.swing.Icon;
import javax.swing.event.*;
Icon decorator that implements the view interface. The
entire element is used to represent the icon. This acts
as a gateway from the display-only View implementations to
interactive lightweight icons (that is, it allows icons
to be embedded into the View hierarchy. The parent of the icon
is the container that is handed out by the associated view
factory.
Author: Timothy Prinzing
/**
* Icon decorator that implements the view interface. The
* entire element is used to represent the icon. This acts
* as a gateway from the display-only View implementations to
* interactive lightweight icons (that is, it allows icons
* to be embedded into the View hierarchy. The parent of the icon
* is the container that is handed out by the associated view
* factory.
*
* @author Timothy Prinzing
*/
public class IconView extends View {
Creates a new icon view that represents an element.
Params: - elem – the element to create a view for
/**
* Creates a new icon view that represents an element.
*
* @param elem the element to create a view for
*/
public IconView(Element elem) {
super(elem);
AttributeSet attr = elem.getAttributes();
c = StyleConstants.getIcon(attr);
}
// --- View methods ---------------------------------------------
Paints the icon.
The real paint behavior occurs naturally from the association
that the icon has with its parent container (the same
container hosting this view), so this simply allows us to
position the icon properly relative to the view. Since
the coordinate system for the view is simply the parent
containers, positioning the child icon is easy.
Params: - g – the rendering surface to use
- a – the allocated region to render into
See Also:
/**
* Paints the icon.
* The real paint behavior occurs naturally from the association
* that the icon has with its parent container (the same
* container hosting this view), so this simply allows us to
* position the icon properly relative to the view. Since
* the coordinate system for the view is simply the parent
* containers, positioning the child icon is easy.
*
* @param g the rendering surface to use
* @param a the allocated region to render into
* @see View#paint
*/
public void paint(Graphics g, Shape a) {
Rectangle alloc = a.getBounds();
c.paintIcon(getContainer(), g, alloc.x, alloc.y);
}
Determines the preferred span for this view along an
axis.
Params: - axis – may be either View.X_AXIS or View.Y_AXIS
Throws: - IllegalArgumentException – for an invalid axis
Returns: the span the view would like to be rendered into
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.
/**
* Determines the preferred span for this view along an
* axis.
*
* @param axis may be either View.X_AXIS or View.Y_AXIS
* @return the span the view would like to be rendered into
* 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
*/
public float getPreferredSpan(int axis) {
switch (axis) {
case View.X_AXIS:
return c.getIconWidth();
case View.Y_AXIS:
return c.getIconHeight();
default:
throw new IllegalArgumentException("Invalid axis: " + axis);
}
}
Determines the desired alignment for this view along an
axis. This is implemented to give the alignment to the
bottom of the icon along the y axis, and the default
along the x axis.
Params: - axis – may be either View.X_AXIS or View.Y_AXIS
Returns: the desired alignment >= 0.0f && <= 1.0f. This should be
a value between 0.0 and 1.0 where 0 indicates alignment at the
origin and 1.0 indicates alignment to the full span
away from the origin. An alignment of 0.5 would be the
center of the view.
/**
* Determines the desired alignment for this view along an
* axis. This is implemented to give the alignment to the
* bottom of the icon along the y axis, and the default
* along the x axis.
*
* @param axis may be either View.X_AXIS or View.Y_AXIS
* @return the desired alignment >= 0.0f && <= 1.0f. This should be
* a value between 0.0 and 1.0 where 0 indicates alignment at the
* origin and 1.0 indicates alignment to the full span
* away from the origin. An alignment of 0.5 would be the
* center of the view.
*/
public float getAlignment(int axis) {
switch (axis) {
case View.Y_AXIS:
return 1;
default:
return super.getAlignment(axis);
}
}
Provides a mapping from the document model coordinate space
to the coordinate space of the view mapped to it.
Params: - pos – the position to convert >= 0
- a – the allocated region to render into
Throws: - BadLocationException – if the given position does not
represent a valid location in the associated document
See Also: Returns: the bounding box of the given position
/**
* Provides a mapping from the document model coordinate space
* to the coordinate space of the view mapped to it.
*
* @param pos the position to convert >= 0
* @param a the allocated region to render into
* @return the bounding box of the given position
* @exception BadLocationException if the given position does not
* represent a valid location in the associated document
* @see View#modelToView
*/
public Shape modelToView(int pos, Shape a, Position.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 view coordinate space to the logical
coordinate space of the model.
Params: - x – the X coordinate >= 0
- y – the Y coordinate >= 0
- a – the allocated region to render into
See Also: Returns: the location within the model that best represents the
given point of view >= 0
/**
* Provides a mapping from the view coordinate space to the logical
* coordinate space of the model.
*
* @param x the X coordinate >= 0
* @param y the Y coordinate >= 0
* @param a the allocated region to render into
* @return the location within the model that best represents the
* given point of view >= 0
* @see View#viewToModel
*/
public int viewToModel(float x, float y, Shape a, Position.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();
}
// --- member variables ------------------------------------------------
private Icon c;
}