Java example source code file (WindowsTextUI.java)
The WindowsTextUI.java Java example source code/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package com.sun.java.swing.plaf.windows;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.Shape;
import javax.swing.plaf.basic.*;
import javax.swing.*;
import javax.swing.plaf.TextUI;
import javax.swing.plaf.UIResource;
import javax.swing.text.*;
/**
* Windows text rendering.
* <p>
* <strong>Warning:
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is appropriate
* for short term storage or RMI between applications running the same
* version of Swing. A future release of Swing will provide support for
* long term persistence.
*/
public abstract class WindowsTextUI extends BasicTextUI {
/**
* Creates the object to use for a caret. By default an
* instance of WindowsCaret is created. This method
* can be redefined to provide something else that implements
* the InputPosition interface or a subclass of DefaultCaret.
*
* @return the caret object
*/
protected Caret createCaret() {
return new WindowsCaret();
}
/* public */
static LayeredHighlighter.LayerPainter WindowsPainter = new WindowsHighlightPainter(null);
/* public */
static class WindowsCaret extends DefaultCaret
implements UIResource {
/**
* Gets the painter for the Highlighter.
*
* @return the painter
*/
protected Highlighter.HighlightPainter getSelectionPainter() {
return WindowsTextUI.WindowsPainter;
}
}
/* public */
static class WindowsHighlightPainter extends
DefaultHighlighter.DefaultHighlightPainter {
WindowsHighlightPainter(Color c) {
super(c);
}
// --- HighlightPainter methods ---------------------------------------
/**
* Paints a highlight.
*
* @param g the graphics context
* @param offs0 the starting model offset >= 0
* @param offs1 the ending model offset >= offs1
* @param bounds the bounding box for the highlight
* @param c the editor
*/
public void paint(Graphics g, int offs0, int offs1, Shape bounds, JTextComponent c) {
Rectangle alloc = bounds.getBounds();
try {
// --- determine locations ---
TextUI mapper = c.getUI();
Rectangle p0 = mapper.modelToView(c, offs0);
Rectangle p1 = mapper.modelToView(c, offs1);
// --- render ---
Color color = getColor();
if (color == null) {
g.setColor(c.getSelectionColor());
}
else {
g.setColor(color);
}
boolean firstIsDot = false;
boolean secondIsDot = false;
if (c.isEditable()) {
int dot = c.getCaretPosition();
firstIsDot = (offs0 == dot);
secondIsDot = (offs1 == dot);
}
if (p0.y == p1.y) {
// same line, render a rectangle
Rectangle r = p0.union(p1);
if (r.width > 0) {
if (firstIsDot) {
r.x++;
r.width--;
}
else if (secondIsDot) {
r.width--;
}
}
g.fillRect(r.x, r.y, r.width, r.height);
} else {
// different lines
int p0ToMarginWidth = alloc.x + alloc.width - p0.x;
if (firstIsDot && p0ToMarginWidth > 0) {
p0.x++;
p0ToMarginWidth--;
}
g.fillRect(p0.x, p0.y, p0ToMarginWidth, p0.height);
if ((p0.y + p0.height) != p1.y) {
g.fillRect(alloc.x, p0.y + p0.height, alloc.width,
p1.y - (p0.y + p0.height));
}
if (secondIsDot && p1.x > alloc.x) {
p1.x--;
}
g.fillRect(alloc.x, p1.y, (p1.x - alloc.x), p1.height);
}
} catch (BadLocationException e) {
// can't render
}
}
// --- LayerPainter methods ----------------------------
/**
* Paints a portion of a highlight.
*
* @param g the graphics context
* @param offs0 the starting model offset >= 0
* @param offs1 the ending model offset >= offs1
* @param bounds the bounding box of the view, which is not
* necessarily the region to paint.
* @param c the editor
* @param view View painting for
* @return region drawing occurred in
*/
public Shape paintLayer(Graphics g, int offs0, int offs1,
Shape bounds, JTextComponent c, View view) {
Color color = getColor();
if (color == null) {
g.setColor(c.getSelectionColor());
}
else {
g.setColor(color);
}
boolean firstIsDot = false;
boolean secondIsDot = false;
if (c.isEditable()) {
int dot = c.getCaretPosition();
firstIsDot = (offs0 == dot);
secondIsDot = (offs1 == dot);
}
if (offs0 == view.getStartOffset() &&
offs1 == view.getEndOffset()) {
// Contained in view, can just use bounds.
Rectangle alloc;
if (bounds instanceof Rectangle) {
alloc = (Rectangle)bounds;
}
else {
alloc = bounds.getBounds();
}
if (firstIsDot && alloc.width > 0) {
g.fillRect(alloc.x + 1, alloc.y, alloc.width - 1,
alloc.height);
}
else if (secondIsDot && alloc.width > 0) {
g.fillRect(alloc.x, alloc.y, alloc.width - 1,
alloc.height);
}
else {
g.fillRect(alloc.x, alloc.y, alloc.width, alloc.height);
}
return alloc;
}
else {
// Should only render part of View.
try {
// --- determine locations ---
Shape shape = view.modelToView(offs0, Position.Bias.Forward,
offs1,Position.Bias.Backward,
bounds);
Rectangle r = (shape instanceof Rectangle) ?
(Rectangle)shape : shape.getBounds();
if (firstIsDot && r.width > 0) {
g.fillRect(r.x + 1, r.y, r.width - 1, r.height);
}
else if (secondIsDot && r.width > 0) {
g.fillRect(r.x, r.y, r.width - 1, r.height);
}
else {
g.fillRect(r.x, r.y, r.width, r.height);
}
return r;
} catch (BadLocationException e) {
// can't render
}
}
// Only if exception
return null;
}
}
}
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