Package edu.cnu.mdi.component

Interface ButtonPainter

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface ButtonPainter

Paints the vector contents of a DrawnButton or DrawnToggleButton.

A painter is deliberately independent of image files. It is given the target button, the drawable bounds inside the button's insets, and an animation frame value. The same painter instance may be shared by many buttons, so implementations should not store per-button mutable drawing state unless they do so carefully.

Field Summary

Fields

Modifier and Type	Field	Description
static final Dimension	DEFAULT_PREFERRED_SIZE	The default drawing canvas used when no explicit size is supplied.

Method Summary

Modifier and Type	Method	Description
void	draw(Graphics2D g2, AbstractButton button, Rectangle bounds, long frameCount)	Draws the button contents.
default Dimension	getPreferredSize()	Returns the natural canvas size for buttons using this painter.

Field Details

DEFAULT_PREFERRED_SIZE

static final Dimension DEFAULT_PREFERRED_SIZE

The default drawing canvas used when no explicit size is supplied.

Method Details

draw

void draw(Graphics2D g2,
 AbstractButton button,
 Rectangle bounds,
 long frameCount)

Draws the button contents.

Parameters:

g2 - the graphics context; the caller owns and disposes this copy

button - the button being painted

bounds - the drawable area inside the button insets

frameCount - the current animation frame, or 0 for non-animated buttons

getPreferredSize

default Dimension getPreferredSize()

Returns the natural canvas size for buttons using this painter.

Override this for non-square or detailed drawings. The returned dimension is copied by the button, so callers may safely return a shared constant.

Returns:

the preferred drawing size