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package com.explodingpixels.painter;
import com.explodingpixels.widgets.WindowUtils;
import java.awt.Component;
import java.awt.Graphics2D;
/**
* An implementation of {@link Painter} that delegates to given {@code Painter} based on the focused
* state of the {@link Component} supplied in the
* {@link #paint(java.awt.Graphics2D, java.awt.Component, int, int)} method.
*/
public class FocusStatePainter implements Painter<Component> {
private Painter<Component> fComponentFocusedPainter;
private Painter<Component> fWindowFocusedPainter;
private Painter<Component> fWindowUnfocusedPainter;
/**
* Creates a {@link Painter} that delegates to the given {@code Painter}s based on the focus
* state of the supplied {@link Component} or the focus state of it's parent
* {@link java.awt.Window}.
*
* @param componentFocusedPainter the {@code Painter} to use when the given {@code Component} is
* focused or it's parent {@code java.awt.Window} is focused.
* @param windowUnfocusedPainter the {@code Painter} to use when the given {@code Component}'s
* parent {@code java.awt.Window} is unfocused.
*/
public FocusStatePainter(Painter<Component> componentFocusedPainter,
Painter<Component> windowUnfocusedPainter) {
this(componentFocusedPainter, windowUnfocusedPainter, windowUnfocusedPainter);
}
/**
* Creates a {@link Painter} that delegates to the given {@code Painter}s based on the focus
* state of the supplied {@link Component} or the focus state of it's parent
* {@link java.awt.Window}.
*
* @param componentFocusedPainter the {@code Painter} to use when the given {@code Component} is
* focused.
* @param windowFocusedPainter the {@code Painter} to use when the given {@code Component} is
* unfocused but the {@code Component}'s parent window is focused.
* @param windowUnfocusedPainter the {@code Painter} to use when the given {@code Component}'s
* parent {@code java.awt.Window} is unfocused.
*/
public FocusStatePainter(Painter<Component> componentFocusedPainter,
Painter<Component> windowFocusedPainter,
Painter<Component> windowUnfocusedPainter) {
if (componentFocusedPainter == null) {
throw new IllegalArgumentException("Component focused Painter cannot be null.");
}
if (windowFocusedPainter == null) {
throw new IllegalArgumentException("Window focused Painter cannot be null.");
}
if (windowUnfocusedPainter == null) {
throw new IllegalArgumentException("Window unfocused Painter cannot be null.");
}
fComponentFocusedPainter = componentFocusedPainter;
fWindowFocusedPainter = windowFocusedPainter;
fWindowUnfocusedPainter = windowUnfocusedPainter;
}
public void paint(Graphics2D g, Component component, int width, int height) {
Painter<Component> painterToUse;
if (component.hasFocus()) {
painterToUse = fComponentFocusedPainter;
} else if (WindowUtils.isParentWindowFocused(component)) {
painterToUse = fWindowFocusedPainter;
} else {
painterToUse = fWindowUnfocusedPainter;
}
painterToUse.paint(g, component, width, height);
}
}
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