org.apache.poi.hssf.view.brush.PendingPaintings Maven / Gradle / Ivy
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this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
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http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.poi.hssf.view.brush;
import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;
import java.util.ArrayList;
import java.util.List;
/**
* This class is used to hold pending brush paintings. The model is that some
* border drawing requires drawing strokes after all the cells have been
* painted. The list of pending paintings can be put in this object during the
* initial paint of the component, and then executed at the appropriate time,
* such as at the end of the containing object's {@link
* JComponent#paintChildren(Graphics)} method.
*
* It is up to the parent component to invoke the {@link #paint(Graphics2D)}
* method of this objet at that appropriate time.
*
* @author Ken Arnold, Industrious Media LLC
*/
public class PendingPaintings {
/**
* The name of the client property that holds this object in the parent
* component.
*/
public static final String PENDING_PAINTINGS =
PendingPaintings.class.getSimpleName();
private final List paintings;
/** A single painting description. */
public static class Painting {
final Stroke stroke;
final Color color;
final Shape shape;
final AffineTransform transform;
/**
* Creates a new painting description.
*
* @param stroke The stroke to paint.
* @param color The color of the stroke.
* @param shape The shape of the stroke.
* @param transform The transformation matrix to use.
*/
public Painting(Stroke stroke, Color color, Shape shape,
AffineTransform transform) {
this.color = color;
this.shape = shape;
this.stroke = stroke;
this.transform = transform;
}
/**
* Draw the painting.
*
* @param g The graphics object to use to draw with.
*/
public void draw(Graphics2D g) {
g.setTransform(transform);
g.setStroke(stroke);
g.setColor(color);
g.draw(shape);
}
}
/**
* Creates a new object on the given parent. The created object will be
* stored as a client property.
*
* @param parent
*/
public PendingPaintings(JComponent parent) {
paintings = new ArrayList<>();
parent.putClientProperty(PENDING_PAINTINGS, this);
}
/** Drops all pending paintings. */
public void clear() {
paintings.clear();
}
/**
* Paints all pending paintings. Once they have been painted they are
* removed from the list of pending paintings (they aren't pending anymore,
* after all).
*
* @param g The graphics object to draw with.
*/
public void paint(Graphics2D g) {
g.setBackground(Color.CYAN);
AffineTransform origTransform = g.getTransform();
for (Painting c : paintings) {
c.draw(g);
}
g.setTransform(origTransform);
clear();
}
/**
* Adds a new pending painting to the list on the given component. This
* will find the first ancestor that has a {@link PendingPaintings} client
* property, starting with the component itself.
*
* @param c The component for which the painting is being added.
* @param g The graphics object to draw with.
* @param stroke The stroke to draw.
* @param color The color to draw with.
* @param shape The shape to stroke.
*/
public static void add(JComponent c, Graphics2D g, Stroke stroke,
Color color, Shape shape) {
add(c, new Painting(stroke, color, shape, g.getTransform()));
}
/**
* Adds a new pending painting to the list on the given component. This
* will find the first ancestor that has a {@link PendingPaintings} client
* property, starting with the component itself.
*
* @param c The component for which the painting is being added.
* @param newPainting The new painting.
*/
public static void add(JComponent c, Painting newPainting) {
PendingPaintings pending = pendingPaintingsFor(c);
if (pending != null) {
pending.paintings.add(newPainting);
}
}
/**
* Returns the pending painting object for the given component, if any. This
* is retrieved from the first object found that has a {@link
* #PENDING_PAINTINGS} client property, starting with this component and
* looking up its ancestors (parent, parent's parent, etc.)
*
* This allows any descendant of a component that has a {@link
* PendingPaintings} property to add its own pending paintings.
*
* @param c The component for which the painting is being added.
*
* @return The pending painting object for that component, or null
* if there is none.
*/
public static PendingPaintings pendingPaintingsFor(JComponent c) {
for (Component parent = c;
parent != null;
parent = parent.getParent()) {
if (parent instanceof JComponent) {
JComponent jc = (JComponent) parent;
Object pd = jc.getClientProperty(PENDING_PAINTINGS);
if (pd != null)
return (PendingPaintings) pd;
}
}
return null;
}
}