Improve script display in the observatory.

runtime/bin/vmservice/client/lib/src/app/pane.dart

-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-part of app;
-
-/// A [Pane] controls the user interface of Observatory. At any given time
-/// one pane will be the current pane. Panes are registered at startup.
-/// When the user navigates within the application, each pane is asked if it
-/// can handle the current location, the first pane to say yes, wins.
-abstract class Pane extends Observable {
-  final ObservatoryApplication app;
-
-  @observable ObservatoryElement element;
-
-  Pane(this.app);
-
-  /// Called when the pane is installed, this callback must initialize
-  /// [element].
-  void onInstall();
-
-  /// Called when the pane is uninstalled, this callback must clear
-  /// [element].
-  void onUninstall() {
-    element = null;
-  }
-
-  /// Called when the pane should update its state based on [url].
-  /// NOTE: Only called when the pane is installed.
-  void visit(String url);
-
-  /// Called to test whether this pane can visit [url].
-  bool canVisit(String url);
-}
-
-/// A general service object viewer.
-class ServiceObjectPane extends Pane {
-  ServiceObjectPane(app) : super(app);
-
-  void onInstall() {
-    if (element == null) {
-      /// Lazily create pane.
-      element = new Element.tag('service-view');
-    }
-  }
-
-  void visit(String url) {
-    assert(element != null);
-    assert(canVisit(url));
-    if (url == '') {
-      // Nothing requested.
-      return;
-    }
-    /// Request url from VM and display it.
-    app.vm.get(url).then((obj) {
-      ServiceObjectViewElement pane = element;
-      pane.object = obj;
-    }).catchError((e) {
-      Logger.root.severe('ServiceObjectPane visit error: $e');
-    });
-  }
-
-  /// Catch all.
-  bool canVisit(String url) => true;
-}
-
-/// Class tree pane.
-class ClassTreePane extends Pane {
-  static const _urlPrefix = 'class-tree/';
-
-  ClassTreePane(app) : super(app);
-
-  void onInstall() {
-    if (element == null) {
-      element = new Element.tag('class-tree');
-    }
-  }
-
-  void visit(String url) {
-    assert(element != null);
-    assert(canVisit(url));
-    // ClassTree urls are 'class-tree/isolate-id', chop off prefix, leaving
-    // isolate url.
-    url = url.substring(_urlPrefix.length);
-    /// Request the isolate url.
-    app.vm.get(url).then((i) {
-      if (element != null) {
-        /// Update the pane.
-        ClassTreeElement pane = element;
-        pane.isolate = i;
-      }
-    }).catchError((e) {
-      Logger.root.severe('ClassTreePane visit error: $e');
-    });
-  }
-
-  /// Catch all.
-  bool canVisit(String url) => url.startsWith(_urlPrefix);
-}
-
-class ErrorViewPane extends Pane {
-  ErrorViewPane(app) : super(app);
-
-  void onInstall() {
-    if (element == null) {
-      /// Lazily create pane.
-      element = new Element.tag('service-view');
-    }
-  }
-
-  void visit(String url) {
-    assert(element != null);
-    assert(canVisit(url));
-    (element as ServiceObjectViewElement).object = app.lastErrorOrException;
-  }
-
-  bool canVisit(String url) => url.startsWith('error/');
-}
-
-class VMConnectPane extends Pane {
-  VMConnectPane(app) : super(app);
-
-  void onInstall() {
-    if (element == null) {
-      element = new Element.tag('vm-connect');
-    }
-    assert(element != null);
-  }
-
-  void visit(String url) {
-    assert(element != null);
-    assert(canVisit(url));
-  }
-
-  bool canVisit(String url) => url.startsWith('vm-connect/');
-}