Build Observatory as part of runtime

runtime/bin/vmservice/observatory/lib/src/app/view_model.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;
-
-abstract class TableTreeRow extends Observable {
-  final TableTreeRow parent;
-  @observable final int depth;
-  @observable final List<TableTreeRow> children = new List<TableTreeRow>();
-  @observable final List<String> columns = [];
-  static const arrowRight = '\u2192';
-  static const arrowDownRight = '\u21b3';
-  static const showExpanderStyle = 'cursor: pointer;';
-  static const hideExpanderStyle = 'visibility:hidden;';
-
-  // TODO(johnmccutchan): Move expander display decisions into html once
-  // tables and templates are better supported.
-  @observable String expander = arrowRight;
-  @observable String expanderStyle = showExpanderStyle;
-
-  TableTreeRow(TableTreeRow parent) :
-      parent = parent,
-      depth = parent != null ? parent.depth+1 : 0 {
-    if (!hasChildren()) {
-      expanderStyle = hideExpanderStyle;
-    }
-  }
-
-  bool _expanded = false;
-  bool get expanded => _expanded;
-  set expanded(bool expanded) {
-    var changed = _expanded != expanded;
-    _expanded = expanded;
-    if (changed) {
-      // If the state has changed, fire callbacks.
-      if (_expanded) {
-        expander = arrowDownRight;
-        onShow();
-      } else {
-        expander = arrowRight;
-        onHide();
-      }
-    }
-  }
-
-  bool toggle() {
-    expanded = !expanded;
-    return expanded;
-  }
-
-  bool hasChildren();
-
-  /// Fired when the tree row is expanded. Add children rows here.
-  void onShow();
-
-  /// Fired when the tree row is collapsed.
-  void onHide();
-}
-
-class TableTree extends Observable {
-  @observable final List<TableTreeRow> rows = toObservable([]);
-
-  /// Create a table tree with column [headers].
-  TableTree();
-
-  /// Initialize the table tree with the list of root children.
-  void initialize(TableTreeRow root) {
-    rows.clear();
-    root.onShow();
-    rows.addAll(root.children);
-  }
-
-  /// Toggle expansion of row at [rowIndex].
-  void toggle(int rowIndex) {
-    assert(rowIndex >= 0);
-    assert(rowIndex < rows.length);
-    var row = rows[rowIndex];
-    if (row.toggle()) {
-      _expand(row);
-    } else {
-      _collapse(row);
-    }
-  }
-
-  int _index(TableTreeRow row) => rows.indexOf(row);
-
-  void _expand(TableTreeRow row) {
-    int index = _index(row);
-    assert(index != -1);
-    rows.insertAll(index + 1, row.children);
-  }
-
-  void _collapse(TableTreeRow row) {
-    var childCount = row.children.length;
-    if (childCount == 0) {
-      return;
-    }
-    for (var i = 0; i < childCount; i++) {
-      // Close all inner rows.
-      if (row.children[i].expanded) {
-        _collapse(row.children[i]);
-      }
-    }
-    // Collapse this row.
-    row.expanded = false;
-    // Remove all children.
-    int index = _index(row);
-    rows.removeRange(index + 1, index + 1 + childCount);
-  }
-}
-
-typedef String ValueFormatter(dynamic value);
-
-class SortedTableColumn {
-  static String toStringFormatter(dynamic v) {
-    return v != null ? v.toString() : '<null>';
-  }
-  final String label;
-  final ValueFormatter formatter;
-  SortedTableColumn.withFormatter(this.label, this.formatter);
-  SortedTableColumn(this.label)
-      : formatter = toStringFormatter;
-}
-
-class SortedTableRow {
-  final List values;
-  SortedTableRow(this.values);
-}
-
-class SortedTable extends Observable {
-  final List<SortedTableColumn> columns;
-  final List<SortedTableRow> rows = new List<SortedTableRow>();
-  final List<int> sortedRows = [];
-
-  SortedTable(this.columns);
-
-  int _sortColumnIndex = 0;
-  set sortColumnIndex(var index) {
-    assert(index >= 0);
-    assert(index < columns.length);
-    _sortColumnIndex = index;
-    notifyPropertyChange(#getColumnLabel, 0, 1);
-  }
-  int get sortColumnIndex => _sortColumnIndex;
-  bool _sortDescending = true;
-  bool get sortDescending => _sortDescending;
-  set sortDescending(var descending) {
-    _sortDescending = descending;
-    notifyPropertyChange(#getColumnLabel, 0, 1);
-  }
-
-
-  dynamic getSortKeyFor(int row, int col) {
-    return rows[row].values[col];
-  }
-
-  int _sortFuncDescending(int i, int j) {
-    var a = getSortKeyFor(i, _sortColumnIndex);
-    var b = getSortKeyFor(j, _sortColumnIndex);
-    return b.compareTo(a);
-  }
-
-  int _sortFuncAscending(int i, int j) {
-    var a = getSortKeyFor(i, _sortColumnIndex);
-    var b = getSortKeyFor(j, _sortColumnIndex);
-    return a.compareTo(b);
-  }
-
-  void sort() {
-    Stopwatch sw = new Stopwatch()..start();
-    assert(_sortColumnIndex >= 0);
-    assert(_sortColumnIndex < columns.length);
-    if (_sortDescending) {
-      sortedRows.sort(_sortFuncDescending);
-    } else {
-      sortedRows.sort(_sortFuncAscending);
-    }
-  }
-
-  void clearRows() {
-    rows.clear();
-    sortedRows.clear();
-  }
-
-  void addRow(SortedTableRow row) {
-    sortedRows.add(rows.length);
-    rows.add(row);
-  }
-
-  String getFormattedValue(int row, int column) {
-    var value = getValue(row, column);
-    var formatter = columns[column].formatter;
-    return formatter(value);
-  }
-
-  @observable String getColumnLabel(int column) {
-    assert(column >= 0);
-    assert(column < columns.length);
-    // TODO(johnmccutchan): Move expander display decisions into html once
-    // tables and templates are better supported.
-    const arrowUp = '\u25BC';
-    const arrowDown = '\u25B2';
-    if (column != _sortColumnIndex) {
-      return columns[column].label + '\u2003';
-    }
-    return columns[column].label + (_sortDescending ? arrowUp : arrowDown);
-  }
-
-  dynamic getValue(int row, int column) {
-    return rows[row].values[column];
-  }
-}