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PdeScrollBarUI.java
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157 lines (123 loc) · 4.51 KB
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/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
PdeScrollBarUI - Custom scroll bar for the editor
Part of the Processing project - https://processing.org
Copyright (c) 2022 The Processing Foundation
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package processing.app.laf;
import processing.app.ui.Theme;
import javax.swing.*;
import javax.swing.plaf.basic.BasicScrollBarUI;
import java.awt.*;
/**
* Custom scroll bar style for the editor.
* Originally based on <a href="https://stackoverflow.com/a/53662678">this post</a>
* and extends <a href="https://github.com/AdoptOpenJDK/openjdk-jdk8u/blob/master/jdk/src/share/classes/javax/swing/plaf/basic/BasicScrollBarUI.java">BasicScrollBarUI</a>.
*/
public class PdeScrollBarUI extends BasicScrollBarUI {
private final Dimension NONE = new Dimension();
final private String backgroundAttr;
final private String pressedAttr;
final private String rolloverAttr;
final private String enabledAttr;
private Color backgroundColor;
private Color pressedColor;
private Color rolloverColor;
private Color enabledColor;
public PdeScrollBarUI(String prefix) {
/*
this(prefix + ".scrollbar.color",
prefix + ".scrollbar.thumb.pressed.color",
prefix + ".scrollbar.thumb.rollover.color",
prefix + ".scrollbar.thumb.enabled.color");
}
public PdeScrollBarUI(String backgroundAttr, String pressedAttr,
String rolloverAttr, String enabledAttr) {
this.backgroundAttr = backgroundAttr;
this.pressedAttr = pressedAttr;
this.rolloverAttr = rolloverAttr;
this.enabledAttr = enabledAttr;
*/
this.backgroundAttr = prefix + ".color";
this.pressedAttr = prefix + ".thumb.pressed.color";
this.rolloverAttr = prefix + ".thumb.rollover.color";
this.enabledAttr = prefix + ".thumb.enabled.color";
}
public void updateTheme() {
backgroundColor = Theme.getColor(backgroundAttr);
pressedColor = Theme.getColor(pressedAttr);
rolloverColor = Theme.getColor(rolloverAttr);
enabledColor = Theme.getColor(enabledAttr);
}
@Override
protected JButton createDecreaseButton(int orientation) {
return new JButton() {
@Override
public Dimension getPreferredSize() {
return NONE;
}
};
}
@Override
protected JButton createIncreaseButton(int orientation) {
return new JButton() {
@Override
public Dimension getPreferredSize() {
return NONE;
}
};
}
/*
@Override
public void paint(Graphics g, JComponent c) {
// this takes care of the track as well as the corner notch
// where the horizontal and vertical scrollbars meet (edit: nope)
g.setColor(Theme.getColor("editor.scrollbar.color"));
g.fillRect(0, 0, c.getWidth(), c.getHeight());
super.paint(g, c);
}
*/
@Override
protected void paintTrack(Graphics g, JComponent c, Rectangle r) {
g.setColor(backgroundColor);
g.fillRect(0, 0, c.getWidth(), c.getHeight());
}
@Override
protected void paintThumb(Graphics g, JComponent c, Rectangle r) {
Graphics2D g2 = (Graphics2D) g.create();
// this can't really be necessary, can it?
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Color color;
JScrollBar sb = (JScrollBar) c;
if (sb.isEnabled()) {
if (isDragging) {
color = pressedColor;
} else if (isThumbRollover()) {
color = rolloverColor;
} else {
color = enabledColor;
}
g2.setPaint(color);
int inset = 3;
int arc = Math.min(c.getWidth(), c.getHeight()) - inset*2;
g2.fillRoundRect(r.x + inset, r.y + inset, r.width - inset*2, r.height - inset*2, arc, arc);
g2.dispose();
}
}
@Override
protected void setThumbBounds(int x, int y, int width, int height) {
super.setThumbBounds(x, y, width, height);
scrollbar.repaint();
}
}