isabelle: src/Tools/jEdit/src/jedit/html_panel.scala@9640f6546179 (annotated)

wenzelm@36760	1	/* Title: Tools/jEdit/src/jedit/html_panel.scala
wenzelm@36760	2	Author: Makarius
wenzelm@36760	3
wenzelm@36760	4	HTML panel based on Lobo/Cobra.
wenzelm@36760	5	*/
wenzelm@34765	6
wenzelm@34871	7	package isabelle.jedit
wenzelm@34765	8
wenzelm@34765	9
wenzelm@36015	10	import isabelle._
wenzelm@36015	11
wenzelm@34765	12	import java.io.StringReader
wenzelm@36817	13	import java.awt.{BorderLayout, Dimension, GraphicsEnvironment, Toolkit, FontMetrics}
wenzelm@34775	14	import java.awt.event.MouseEvent
wenzelm@34775	15
wenzelm@34765	16	import javax.swing.{JButton, JPanel, JScrollPane}
wenzelm@34765	17	import java.util.logging.{Logger, Level}
wenzelm@34765	18
wenzelm@34775	19	import org.w3c.dom.html2.HTMLElement
wenzelm@34765	20
wenzelm@34765	21	import org.lobobrowser.html.parser.{DocumentBuilderImpl, InputSourceImpl}
wenzelm@34765	22	import org.lobobrowser.html.gui.HtmlPanel
wenzelm@34765	23	import org.lobobrowser.html.domimpl.{HTMLDocumentImpl, HTMLStyleElementImpl, NodeImpl}
wenzelm@34765	24	import org.lobobrowser.html.test.{SimpleHtmlRendererContext, SimpleUserAgentContext}
wenzelm@34765	25
wenzelm@34765	26	import scala.actors.Actor._
wenzelm@34765	27
wenzelm@34765	28
wenzelm@34775	29	object HTML_Panel
wenzelm@34775	30	{
wenzelm@34775	31	sealed abstract class Event { val element: HTMLElement; val mouse: MouseEvent }
wenzelm@34775	32	case class Context_Menu(val element: HTMLElement, mouse: MouseEvent) extends Event
wenzelm@34775	33	case class Mouse_Click(val element: HTMLElement, mouse: MouseEvent) extends Event
wenzelm@34775	34	case class Double_Click(val element: HTMLElement, mouse: MouseEvent) extends Event
wenzelm@34775	35	case class Mouse_Over(val element: HTMLElement, mouse: MouseEvent) extends Event
wenzelm@34775	36	case class Mouse_Out(val element: HTMLElement, mouse: MouseEvent) extends Event
wenzelm@34775	37	}
wenzelm@34775	38
wenzelm@34775	39
wenzelm@34775	40	class HTML_Panel(
wenzelm@36992	41	system: Isabelle_System,
wenzelm@36817	42	initial_font_size: Int,
wenzelm@34775	43	handler: PartialFunction[HTML_Panel.Event, Unit]) extends HtmlPanel
wenzelm@34765	44	{
wenzelm@37034	45	/ Lobo setup /
wenzelm@37034	46
wenzelm@37034	47	/* global logging */
wenzelm@37034	48
wenzelm@34765	49	Logger.getLogger("org.lobobrowser").setLevel(Level.WARNING)
wenzelm@34765	50
wenzelm@34765	51
wenzelm@37034	52	/* pixel size -- cf. org.lobobrowser.html.style.HtmlValues.getFontSize */
wenzelm@36817	53
wenzelm@36817	54	val screen_resolution =
wenzelm@36817	55	if (GraphicsEnvironment.isHeadless()) 72
wenzelm@36817	56	else Toolkit.getDefaultToolkit().getScreenResolution()
wenzelm@36817	57
wenzelm@36817	58	def lobo_px(raw_px: Int): Int = raw_px * 96 / screen_resolution
wenzelm@36817	59	def raw_px(lobo_px: Int): Int = (lobo_px * screen_resolution + 95) / 96
wenzelm@36817	60
wenzelm@36817	61
wenzelm@36993	62	private val ucontext = new SimpleUserAgentContext
wenzelm@36993	63	private val rcontext = new SimpleHtmlRendererContext(this, ucontext)
wenzelm@36993	64	{
wenzelm@36993	65	private def handle(event: HTML_Panel.Event): Boolean =
wenzelm@36993	66	if (handler != null && handler.isDefinedAt(event)) { handler(event); true }
wenzelm@36993	67	else false
wenzelm@36993	68
wenzelm@36993	69	override def onContextMenu(elem: HTMLElement, event: MouseEvent): Boolean =
wenzelm@36993	70	handle(HTML_Panel.Context_Menu(elem, event))
wenzelm@36993	71	override def onMouseClick(elem: HTMLElement, event: MouseEvent): Boolean =
wenzelm@36993	72	handle(HTML_Panel.Mouse_Click(elem, event))
wenzelm@36993	73	override def onDoubleClick(elem: HTMLElement, event: MouseEvent): Boolean =
wenzelm@36993	74	handle(HTML_Panel.Double_Click(elem, event))
wenzelm@36993	75	override def onMouseOver(elem: HTMLElement, event: MouseEvent)
wenzelm@36993	76	{ handle(HTML_Panel.Mouse_Over(elem, event)) }
wenzelm@36993	77	override def onMouseOut(elem: HTMLElement, event: MouseEvent)
wenzelm@36993	78	{ handle(HTML_Panel.Mouse_Out(elem, event)) }
wenzelm@36993	79	}
wenzelm@36993	80
wenzelm@36993	81	private val builder = new DocumentBuilderImpl(ucontext, rcontext)
wenzelm@36993	82
wenzelm@36993	83
wenzelm@37015	84	/* document template with style sheets */
wenzelm@34765	85
wenzelm@37015	86	private val template_head =
wenzelm@34765	87	"""<?xml version="1.0" encoding="utf-8"?>
wenzelm@34765	88	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
wenzelm@34765	89	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
wenzelm@34765	90	<html xmlns="http://www.w3.org/1999/xhtml">
wenzelm@34765	91	<head>
wenzelm@34770	92	<style media="all" type="text/css">
wenzelm@34770	93	""" +
wenzelm@36992	94	system.try_read("$ISABELLE_HOME/lib/html/isabelle.css") + "\n" +
wenzelm@37015	95	system.try_read("$ISABELLE_HOME_USER/etc/isabelle.css") + "\n"
wenzelm@37015	96
wenzelm@37015	97	private val template_tail =
wenzelm@34765	98	"""
wenzelm@34765	99	</style>
wenzelm@34765	100	</head>
wenzelm@34765	101	<body/>
wenzelm@34765	102	</html>
wenzelm@34765	103	"""
wenzelm@37015	104
wenzelm@37015	105	private def template(font_size: Int): String =
wenzelm@37015	106	template_head +
wenzelm@37015	107	"body { font-family: " + system.font_family + "; font-size: " + raw_px(font_size) + "px }" +
wenzelm@37015	108	template_tail
wenzelm@37015	109
wenzelm@37015	110
wenzelm@37034	111	/ main actor /
wenzelm@37034	112
wenzelm@37034	113	/* internal messages */
wenzelm@37034	114
wenzelm@37034	115	private case class Resize(font_size: Int)
wenzelm@37034	116	private case class Render(body: List[XML.Tree])
wenzelm@37034	117	private case object Refresh
wenzelm@34765	118
wenzelm@37034	119	private val main_actor = actor {
wenzelm@37034	120
wenzelm@37034	121	/* internal state */
wenzelm@37034	122
wenzelm@37034	123	var current_font_metrics: FontMetrics = null
wenzelm@37034	124	var current_font_size: Int = 0
wenzelm@37034	125	var current_margin: Int = 0
wenzelm@37034	126	var current_body: List[XML.Tree] = Nil
wenzelm@34765	127
wenzelm@36993	128	def resize(font_size: Int)
wenzelm@36993	129	{
wenzelm@37034	130	val (font_metrics, margin) =
wenzelm@36993	131	Swing_Thread.now {
wenzelm@37034	132	val metrics = getFontMetrics(system.get_font(lobo_px(raw_px(font_size))))
wenzelm@37034	133	(metrics, (getWidth() / (metrics.charWidth(Symbol.spc) max 1) - 4) max 20)
wenzelm@36993	134	}
wenzelm@37034	135	if (current_font_metrics == null \|\|
wenzelm@37034	136	current_font_size != font_size \|\|
wenzelm@37034	137	current_margin != margin)
wenzelm@37034	138	{
wenzelm@37034	139	current_font_metrics = font_metrics
wenzelm@37034	140	current_font_size = font_size
wenzelm@37034	141	current_margin = margin
wenzelm@37014	142	refresh()
wenzelm@36993	143	}
wenzelm@36814	144	}
wenzelm@36814	145
wenzelm@37014	146	def refresh() { render(current_body) }
wenzelm@37014	147
wenzelm@36993	148	def render(body: List[XML.Tree])
wenzelm@36993	149	{
wenzelm@36993	150	current_body = body
wenzelm@36993	151	val html_body =
wenzelm@36993	152	current_body.flatMap(div =>
wenzelm@37034	153	Pretty.formatted(List(div), current_margin, Pretty.font_metric(current_font_metrics))
wenzelm@36993	154	.map(t => XML.elem(HTML.PRE, HTML.spans(t))))
wenzelm@37034	155	val doc =
wenzelm@37034	156	builder.parse(
wenzelm@37034	157	new InputSourceImpl(new StringReader(template(current_font_size)), "http://localhost"))
wenzelm@37034	158	doc.removeChild(doc.getLastChild())
wenzelm@37034	159	doc.appendChild(XML.document_node(doc, XML.elem(HTML.BODY, html_body)))
wenzelm@37034	160	Swing_Thread.later { setDocument(doc, rcontext) }
wenzelm@37034	161	}
wenzelm@34775	162
wenzelm@37034	163
wenzelm@37034	164	/* main loop */
wenzelm@36993	165
wenzelm@36993	166	resize(initial_font_size)
wenzelm@34775	167
wenzelm@34765	168	loop {
wenzelm@34765	169	react {
wenzelm@37034	170	case Resize(font_size) => resize(font_size)
wenzelm@37034	171	case Refresh => refresh()
wenzelm@37034	172	case Render(body) => render(body)
wenzelm@34769	173	case bad => System.err.println("main_actor: ignoring bad message " + bad)
wenzelm@34765	174	}
wenzelm@34765	175	}
wenzelm@34765	176	}
wenzelm@34765	177
wenzelm@37034	178
wenzelm@37034	179	/* external methods */
wenzelm@37034	180
wenzelm@36993	181	def resize(font_size: Int) { main_actor ! Resize(font_size) }
wenzelm@37014	182	def refresh() { main_actor ! Refresh }
wenzelm@36993	183	def render(body: List[XML.Tree]) { main_actor ! Render(body) }
wenzelm@34765	184	}

author	wenzelm
	Fri May 21 11:16:01 2010 +0200 (2010-05-21)
changeset 37034	9640f6546179
parent 37016	9dfcde68b383
child 37036	49559c4e85f9
permissions	-rw-r--r--