/* Title: Tools/jEdit/src/rich_text_area.scala
Author: Makarius
Enhanced version of jEdit text area, with rich text rendering,
tooltips, hyperlinks etc.
*/
package isabelle.jedit
import isabelle._
import java.awt.{Graphics2D, Shape, Window, Color}
import java.awt.event.{MouseMotionAdapter, MouseAdapter, MouseEvent,
FocusAdapter, FocusEvent, WindowEvent, WindowAdapter}
import java.awt.font.TextAttribute
import java.text.AttributedString
import java.util.ArrayList
import org.gjt.sp.util.Log
import org.gjt.sp.jedit.{OperatingSystem, Debug, View}
import org.gjt.sp.jedit.syntax.{DisplayTokenHandler, Chunk}
import org.gjt.sp.jedit.textarea.{TextAreaExtension, TextAreaPainter, TextArea}
class Rich_Text_Area(view: View, text_area: TextArea, get_rendering: () => Isabelle_Rendering)
{
private val buffer = text_area.getBuffer
/* robust extension body */
def robust_body[A](default: A)(body: => A): A =
{
try {
Swing_Thread.require()
if (buffer == text_area.getBuffer) body
else {
Log.log(Log.ERROR, this, ERROR("Implicit change of text area buffer"))
default
}
}
catch { case t: Throwable => Log.log(Log.ERROR, this, t); default }
}
/* original painters */
private def pick_extension(name: String): TextAreaExtension =
{
text_area.getPainter.getExtensions.iterator.filter(x => x.getClass.getName == name).toList
match {
case List(x) => x
case _ => error("Expected exactly one " + name)
}
}
private val orig_text_painter =
pick_extension("org.gjt.sp.jedit.textarea.TextAreaPainter$PaintText")
/* common painter state */
@volatile private var painter_rendering: Isabelle_Rendering = null
@volatile private var painter_clip: Shape = null
private val set_state = new TextAreaExtension
{
override def paintScreenLineRange(gfx: Graphics2D,
first_line: Int, last_line: Int, physical_lines: Array[Int],
start: Array[Int], end: Array[Int], y: Int, line_height: Int)
{
painter_rendering = get_rendering()
painter_clip = gfx.getClip
}
}
private val reset_state = new TextAreaExtension
{
override def paintScreenLineRange(gfx: Graphics2D,
first_line: Int, last_line: Int, physical_lines: Array[Int],
start: Array[Int], end: Array[Int], y: Int, line_height: Int)
{
painter_rendering = null
painter_clip = null
}
}
def robust_rendering(body: Isabelle_Rendering => Unit)
{
robust_body(()) { body(painter_rendering) }
}
/* active areas within the text */
private class Active_Area[A](
rendering: Isabelle_Rendering => Text.Range => Option[Text.Info[A]])
{
private var the_info: Option[Text.Info[A]] = None
def info: Option[Text.Info[A]] = the_info
def update(new_info: Option[Text.Info[A]])
{
val old_info = the_info
if (new_info != old_info) {
for { opt <- List(old_info, new_info); Text.Info(range, _) <- opt }
JEdit_Lib.invalidate_range(text_area, range)
the_info = new_info
}
}
def update_rendering(r: Isabelle_Rendering, range: Text.Range)
{ update(rendering(r)(range)) }
def reset { update(None) }
}
// owned by Swing thread
private var control: Boolean = false
private val highlight_area = new Active_Area[Color]((r: Isabelle_Rendering) => r.highlight _)
private val hyperlink_area = new Active_Area[Hyperlink]((r: Isabelle_Rendering) => r.hyperlink _)
private val active_areas = List(highlight_area, hyperlink_area)
private def active_reset(): Unit = active_areas.foreach(_.reset)
private val focus_listener = new FocusAdapter {
override def focusLost(e: FocusEvent) { robust_body(()) { active_reset() } }
}
private val window_listener = new WindowAdapter {
override def windowIconified(e: WindowEvent) { robust_body(()) { active_reset() } }
override def windowDeactivated(e: WindowEvent) { robust_body(()) { active_reset() } }
}
private val mouse_listener = new MouseAdapter {
override def mouseClicked(e: MouseEvent) {
robust_body(()) {
hyperlink_area.info match {
case Some(Text.Info(range, link)) => link.follow(view)
case None =>
}
}
}
}
private val mouse_motion_listener = new MouseMotionAdapter {
override def mouseMoved(e: MouseEvent) {
robust_body(()) {
control = if (OperatingSystem.isMacOS()) e.isMetaDown else e.isControlDown
if (control && !buffer.isLoading) {
JEdit_Lib.buffer_lock(buffer) {
val rendering = get_rendering()
val mouse_offset = text_area.xyToOffset(e.getX(), e.getY())
val mouse_range = JEdit_Lib.point_range(buffer, mouse_offset)
active_areas.foreach(_.update_rendering(rendering, mouse_range))
}
}
else active_reset()
}
}
}
/* tooltips */
private val tooltip_painter = new TextAreaExtension
{
override def getToolTipText(x: Int, y: Int): String =
{
robust_body(null: String) {
val rendering = get_rendering()
val offset = text_area.xyToOffset(x, y)
val range = Text.Range(offset, offset + 1)
val tip =
if (control) rendering.tooltip(range)
else rendering.tooltip_message(range)
tip.map(Isabelle.tooltip(_)) getOrElse null
}
}
}
/* text background */
private val background_painter = new TextAreaExtension
{
override def paintScreenLineRange(gfx: Graphics2D,
first_line: Int, last_line: Int, physical_lines: Array[Int],
start: Array[Int], end: Array[Int], y: Int, line_height: Int)
{
robust_rendering { rendering =>
val ascent = text_area.getPainter.getFontMetrics.getAscent
for (i <- 0 until physical_lines.length) {
if (physical_lines(i) != -1) {
val line_range = JEdit_Lib.proper_line_range(buffer, start(i), end(i))
// line background color
for { (color, separator) <- rendering.line_background(line_range) }
{
gfx.setColor(color)
val sep = if (separator) (2 min (line_height / 2)) else 0
gfx.fillRect(0, y + i * line_height, text_area.getWidth, line_height - sep)
}
// background color (1)
for {
Text.Info(range, color) <- rendering.background1(line_range)
r <- JEdit_Lib.gfx_range(text_area, range)
} {
gfx.setColor(color)
gfx.fillRect(r.x, y + i * line_height, r.length, line_height)
}
// background color (2)
for {
Text.Info(range, color) <- rendering.background2(line_range)
r <- JEdit_Lib.gfx_range(text_area, range)
} {
gfx.setColor(color)
gfx.fillRect(r.x + 2, y + i * line_height + 2, r.length - 4, line_height - 4)
}
// squiggly underline
for {
Text.Info(range, color) <- rendering.squiggly_underline(line_range)
r <- JEdit_Lib.gfx_range(text_area, range)
} {
gfx.setColor(color)
val x0 = (r.x / 2) * 2
val y0 = r.y + ascent + 1
for (x1 <- Range(x0, x0 + r.length, 2)) {
val y1 = if (x1 % 4 < 2) y0 else y0 + 1
gfx.drawLine(x1, y1, x1 + 1, y1)
}
}
}
}
}
}
}
/* text */
private def paint_chunk_list(rendering: Isabelle_Rendering,
gfx: Graphics2D, line_start: Text.Offset, head: Chunk, x: Float, y: Float): Float =
{
val clip_rect = gfx.getClipBounds
val painter = text_area.getPainter
val font_context = painter.getFontRenderContext
var w = 0.0f
var chunk = head
while (chunk != null) {
val chunk_offset = line_start + chunk.offset
if (x + w + chunk.width > clip_rect.x &&
x + w < clip_rect.x + clip_rect.width && chunk.accessable)
{
val chunk_range = Text.Range(chunk_offset, chunk_offset + chunk.length)
val chunk_str = if (chunk.str == null) " " * chunk.length else chunk.str
val chunk_font = chunk.style.getFont
val chunk_color = chunk.style.getForegroundColor
def string_width(s: String): Float =
if (s.isEmpty) 0.0f
else chunk_font.getStringBounds(s, font_context).getWidth.toFloat
val caret_range =
if (text_area.isCaretVisible)
JEdit_Lib.point_range(buffer, text_area.getCaretPosition)
else Text.Range(-1)
val markup =
for {
r1 <- rendering.text_color(chunk_range, chunk_color)
r2 <- r1.try_restrict(chunk_range)
} yield r2
val padded_markup =
if (markup.isEmpty)
Iterator(Text.Info(chunk_range, chunk_color))
else
Iterator(
Text.Info(Text.Range(chunk_range.start, markup.head.range.start), chunk_color)) ++
markup.iterator ++
Iterator(Text.Info(Text.Range(markup.last.range.stop, chunk_range.stop), chunk_color))
var x1 = x + w
gfx.setFont(chunk_font)
for (Text.Info(range, color) <- padded_markup if !range.is_singularity) {
val str = chunk_str.substring(range.start - chunk_offset, range.stop - chunk_offset)
gfx.setColor(color)
range.try_restrict(caret_range) match {
case Some(r) if !r.is_singularity =>
val i = r.start - range.start
val j = r.stop - range.start
val s1 = str.substring(0, i)
val s2 = str.substring(i, j)
val s3 = str.substring(j)
if (!s1.isEmpty) gfx.drawString(s1, x1, y)
val astr = new AttributedString(s2)
astr.addAttribute(TextAttribute.FONT, chunk_font)
astr.addAttribute(TextAttribute.FOREGROUND, painter.getCaretColor)
astr.addAttribute(TextAttribute.SWAP_COLORS, TextAttribute.SWAP_COLORS_ON)
gfx.drawString(astr.getIterator, x1 + string_width(s1), y)
if (!s3.isEmpty)
gfx.drawString(s3, x1 + string_width(str.substring(0, j)), y)
case _ =>
gfx.drawString(str, x1, y)
}
x1 += string_width(str)
}
}
w += chunk.width
chunk = chunk.next.asInstanceOf[Chunk]
}
w
}
private val text_painter = new TextAreaExtension
{
override def paintScreenLineRange(gfx: Graphics2D,
first_line: Int, last_line: Int, physical_lines: Array[Int],
start: Array[Int], end: Array[Int], y: Int, line_height: Int)
{
robust_rendering { rendering =>
val clip = gfx.getClip
val x0 = text_area.getHorizontalOffset
val fm = text_area.getPainter.getFontMetrics
var y0 = y + fm.getHeight - (fm.getLeading + 1) - fm.getDescent
for (i <- 0 until physical_lines.length) {
val line = physical_lines(i)
if (line != -1) {
val screen_line = first_line + i
val chunks = text_area.getChunksOfScreenLine(screen_line)
if (chunks != null) {
val line_start = buffer.getLineStartOffset(line)
gfx.clipRect(x0, y + line_height * i, Integer.MAX_VALUE, line_height)
val w = paint_chunk_list(rendering, gfx, line_start, chunks, x0, y0).toInt
gfx.clipRect(x0 + w.toInt, 0, Integer.MAX_VALUE, Integer.MAX_VALUE)
orig_text_painter.paintValidLine(gfx,
screen_line, line, start(i), end(i), y + line_height * i)
gfx.setClip(clip)
}
}
y0 += line_height
}
}
}
}
/* foreground */
private val foreground_painter = new TextAreaExtension
{
override def paintScreenLineRange(gfx: Graphics2D,
first_line: Int, last_line: Int, physical_lines: Array[Int],
start: Array[Int], end: Array[Int], y: Int, line_height: Int)
{
robust_rendering { rendering =>
for (i <- 0 until physical_lines.length) {
if (physical_lines(i) != -1) {
val line_range = JEdit_Lib.proper_line_range(buffer, start(i), end(i))
// foreground color
for {
Text.Info(range, color) <- rendering.foreground(line_range)
r <- JEdit_Lib.gfx_range(text_area, range)
} {
gfx.setColor(color)
gfx.fillRect(r.x, y + i * line_height, r.length, line_height)
}
// highlight range -- potentially from other snapshot
for {
info <- highlight_area.info
Text.Info(range, color) <- info.try_restrict(line_range)
r <- JEdit_Lib.gfx_range(text_area, range)
} {
gfx.setColor(color)
gfx.fillRect(r.x, y + i * line_height, r.length, line_height)
}
// hyperlink range -- potentially from other snapshot
for {
info <- hyperlink_area.info
Text.Info(range, _) <- info.try_restrict(line_range)
r <- JEdit_Lib.gfx_range(text_area, range)
} {
gfx.setColor(rendering.hyperlink_color)
gfx.drawRect(r.x, y + i * line_height, r.length - 1, line_height - 1)
}
}
}
}
}
}
/* caret -- outside of text range */
private class Caret_Painter(before: Boolean) extends TextAreaExtension
{
override def paintValidLine(gfx: Graphics2D,
screen_line: Int, physical_line: Int, start: Int, end: Int, y: Int)
{
robust_rendering { _ =>
if (before) gfx.clipRect(0, 0, 0, 0)
else gfx.setClip(painter_clip)
}
}
}
private val before_caret_painter1 = new Caret_Painter(true)
private val after_caret_painter1 = new Caret_Painter(false)
private val before_caret_painter2 = new Caret_Painter(true)
private val after_caret_painter2 = new Caret_Painter(false)
private val caret_painter = new TextAreaExtension
{
override def paintValidLine(gfx: Graphics2D,
screen_line: Int, physical_line: Int, start: Int, end: Int, y: Int)
{
robust_rendering { _ =>
if (text_area.isCaretVisible) {
val caret = text_area.getCaretPosition
if (start <= caret && caret == end - 1) {
val painter = text_area.getPainter
val fm = painter.getFontMetrics
val offset = caret - text_area.getLineStartOffset(physical_line)
val x = text_area.offsetToXY(physical_line, offset).x
gfx.setColor(painter.getCaretColor)
gfx.drawRect(x, y, JEdit_Lib.char_width(text_area) - 1, fm.getHeight - 1)
}
}
}
}
}
/* activation */
def activate()
{
val painter = text_area.getPainter
painter.addExtension(TextAreaPainter.LOWEST_LAYER, set_state)
painter.addExtension(TextAreaPainter.LINE_BACKGROUND_LAYER + 1, tooltip_painter)
painter.addExtension(TextAreaPainter.LINE_BACKGROUND_LAYER + 1, background_painter)
painter.addExtension(TextAreaPainter.TEXT_LAYER, text_painter)
painter.addExtension(TextAreaPainter.CARET_LAYER - 1, before_caret_painter1)
painter.addExtension(TextAreaPainter.CARET_LAYER + 1, after_caret_painter1)
painter.addExtension(TextAreaPainter.BLOCK_CARET_LAYER - 1, before_caret_painter2)
painter.addExtension(TextAreaPainter.BLOCK_CARET_LAYER + 1, after_caret_painter2)
painter.addExtension(TextAreaPainter.BLOCK_CARET_LAYER + 2, caret_painter)
painter.addExtension(500, foreground_painter)
painter.addExtension(TextAreaPainter.HIGHEST_LAYER, reset_state)
painter.removeExtension(orig_text_painter)
painter.addMouseListener(mouse_listener)
painter.addMouseMotionListener(mouse_motion_listener)
text_area.addFocusListener(focus_listener)
view.addWindowListener(window_listener)
}
def deactivate()
{
val painter = text_area.getPainter
view.removeWindowListener(window_listener)
text_area.removeFocusListener(focus_listener)
painter.removeMouseMotionListener(mouse_motion_listener)
painter.removeMouseListener(mouse_listener)
painter.addExtension(TextAreaPainter.TEXT_LAYER, orig_text_painter)
painter.removeExtension(reset_state)
painter.removeExtension(foreground_painter)
painter.removeExtension(caret_painter)
painter.removeExtension(after_caret_painter2)
painter.removeExtension(before_caret_painter2)
painter.removeExtension(after_caret_painter1)
painter.removeExtension(before_caret_painter1)
painter.removeExtension(text_painter)
painter.removeExtension(background_painter)
painter.removeExtension(tooltip_painter)
painter.removeExtension(set_state)
}
}