src/Pure/GUI/gui.scala

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Pure/GUI/gui.scala	Sun Sep 22 14:30:34 2013 +0200
@@ -0,0 +1,154 @@
+/*  Title:      Pure/GUI/gui.scala
+    Author:     Makarius
+
+Basic GUI tools (for AWT/Swing).
+*/
+
+package isabelle
+
+
+import java.awt.{Image, Component, Container, Toolkit, Window}
+import javax.swing.{ImageIcon, JOptionPane, UIManager, JLayeredPane, JFrame, JWindow}
+
+import scala.swing.{ComboBox, TextArea, ScrollPane}
+import scala.swing.event.SelectionChanged
+
+
+object GUI
+{
+  /* Swing look-and-feel */
+
+  def get_laf(): String =
+  {
+    def laf(name: String): Option[String] =
+      UIManager.getInstalledLookAndFeels().find(_.getName == name).map(_.getClassName)
+
+    if (Platform.is_windows || Platform.is_macos)
+      UIManager.getSystemLookAndFeelClassName()
+    else
+      laf("Nimbus") orElse laf("GTK+") getOrElse
+        UIManager.getCrossPlatformLookAndFeelClassName()
+  }
+
+  def init_laf(): Unit = UIManager.setLookAndFeel(get_laf())
+
+
+  /* simple dialogs */
+
+  def scrollable_text(txt: String, width: Int = 60, height: Int = 20, editable: Boolean = false)
+    : ScrollPane =
+  {
+    val text = new TextArea(txt)
+    if (width > 0) text.columns = width
+    if (height > 0 && split_lines(txt).length > height) text.rows = height
+    text.editable = editable
+    new ScrollPane(text)
+  }
+
+  private def simple_dialog(kind: Int, default_title: String,
+    parent: Component, title: String, message: Seq[Any])
+  {
+    Swing_Thread.now {
+      val java_message = message map { case x: scala.swing.Component => x.peer case x => x }
+      JOptionPane.showMessageDialog(parent,
+        java_message.toArray.asInstanceOf[Array[AnyRef]],
+        if (title == null) default_title else title, kind)
+    }
+  }
+
+  def dialog(parent: Component, title: String, message: Any*) =
+    simple_dialog(JOptionPane.PLAIN_MESSAGE, null, parent, title, message)
+
+  def warning_dialog(parent: Component, title: String, message: Any*) =
+    simple_dialog(JOptionPane.WARNING_MESSAGE, "Warning", parent, title, message)
+
+  def error_dialog(parent: Component, title: String, message: Any*) =
+    simple_dialog(JOptionPane.ERROR_MESSAGE, "Error", parent, title, message)
+
+  def confirm_dialog(parent: Component, title: String, option_type: Int, message: Any*): Int =
+    Swing_Thread.now {
+      val java_message = message map { case x: scala.swing.Component => x.peer case x => x }
+      JOptionPane.showConfirmDialog(parent,
+        java_message.toArray.asInstanceOf[Array[AnyRef]], title,
+          option_type, JOptionPane.QUESTION_MESSAGE)
+    }
+
+
+  /* zoom box */
+
+  class Zoom_Box(apply_factor: Int => Unit) extends ComboBox[String](
+    List("50%", "70%", "85%", "100%", "125%", "150%", "175%", "200%", "300%", "400%"))
+  {
+    val Factor = "([0-9]+)%?".r
+    def parse(text: String): Int =
+      text match {
+        case Factor(s) =>
+          val i = Integer.parseInt(s)
+          if (10 <= i && i <= 1000) i else 100
+        case _ => 100
+      }
+
+    def print(i: Int): String = i.toString + "%"
+
+    def set_item(i: Int) {
+      peer.getEditor match {
+        case null =>
+        case editor => editor.setItem(print(i))
+      }
+    }
+
+    makeEditable()(c => new ComboBox.BuiltInEditor(c)(text => print(parse(text)), x => x))
+    reactions += {
+      case SelectionChanged(_) => apply_factor(parse(selection.item))
+    }
+    listenTo(selection)
+    selection.index = 3
+    prototypeDisplayValue = Some("00000%")
+  }
+
+
+  /* screen resolution */
+
+  def resolution_scale(): Double = Toolkit.getDefaultToolkit.getScreenResolution.toDouble / 72
+  def resolution_scale(i: Int): Int = (i.toDouble * resolution_scale()).round.toInt
+
+
+  /* icon */
+
+  def isabelle_icon(): ImageIcon =
+    new ImageIcon(getClass.getClassLoader.getResource("isabelle/isabelle.gif"))
+
+  def isabelle_image(): Image = isabelle_icon().getImage
+
+
+  /* component hierachy */
+
+  def get_parent(component: Component): Option[Container] =
+    component.getParent match {
+      case null => None
+      case parent => Some(parent)
+    }
+
+  def ancestors(component: Component): Iterator[Container] = new Iterator[Container] {
+    private var next_elem = get_parent(component)
+    def hasNext(): Boolean = next_elem.isDefined
+    def next(): Container =
+      next_elem match {
+        case Some(parent) =>
+          next_elem = get_parent(parent)
+          parent
+        case None => Iterator.empty.next()
+      }
+  }
+
+  def parent_window(component: Component): Option[Window] =
+    ancestors(component).collectFirst({ case x: Window => x })
+
+  def layered_pane(component: Component): Option[JLayeredPane] =
+    parent_window(component) match {
+      case Some(window: JWindow) => Some(window.getLayeredPane)
+      case Some(frame: JFrame) => Some(frame.getLayeredPane)
+      case _ => None
+    }
+}
+