1 files changed, 303 insertions, 0 deletions
diff --git a/devtools/client/debugger/views/watch-expressions-view.js b/devtools/client/debugger/views/watch-expressions-view.js
new file mode 100644
index 000000000..59d3ad5a0
--- /dev/null
+++ b/devtools/client/debugger/views/watch-expressions-view.js
@@ -0,0 +1,303 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+/* import-globals-from ../debugger-controller.js */
+/* import-globals-from ../debugger-view.js */
+/* import-globals-from ../utils.js */
+/* globals document */
+"use strict";
+
+const {KeyCodes} = require("devtools/client/shared/keycodes");
+
+/**
+ * Functions handling the watch expressions UI.
+ */
+function WatchExpressionsView(DebuggerController, DebuggerView) {
+  dumpn("WatchExpressionsView was instantiated");
+
+  this.StackFrames = DebuggerController.StackFrames;
+  this.DebuggerView = DebuggerView;
+
+  this.switchExpression = this.switchExpression.bind(this);
+  this.deleteExpression = this.deleteExpression.bind(this);
+  this._createItemView = this._createItemView.bind(this);
+  this._onClick = this._onClick.bind(this);
+  this._onClose = this._onClose.bind(this);
+  this._onBlur = this._onBlur.bind(this);
+  this._onKeyPress = this._onKeyPress.bind(this);
+}
+
+WatchExpressionsView.prototype = Heritage.extend(WidgetMethods, {
+  /**
+   * Initialization function, called when the debugger is started.
+   */
+  initialize: function () {
+    dumpn("Initializing the WatchExpressionsView");
+
+    this.widget = new SimpleListWidget(document.getElementById("expressions"));
+    this.widget.setAttribute("context", "debuggerWatchExpressionsContextMenu");
+    this.widget.addEventListener("click", this._onClick, false);
+
+    this.headerText = L10N.getStr("addWatchExpressionText");
+    this._addCommands();
+  },
+
+  /**
+   * Destruction function, called when the debugger is closed.
+   */
+  destroy: function () {
+    dumpn("Destroying the WatchExpressionsView");
+
+    this.widget.removeEventListener("click", this._onClick, false);
+  },
+
+  /**
+   * Add commands that XUL can fire.
+   */
+  _addCommands: function () {
+    XULUtils.addCommands(document.getElementById("debuggerCommands"), {
+      addWatchExpressionCommand: () => this._onCmdAddExpression(),
+      removeAllWatchExpressionsCommand: () => this._onCmdRemoveAllExpressions()
+    });
+  },
+
+  /**
+   * Adds a watch expression in this container.
+   *
+   * @param string aExpression [optional]
+   *        An optional initial watch expression text.
+   * @param boolean aSkipUserInput [optional]
+   *        Pass true to avoid waiting for additional user input
+   *        on the watch expression.
+   */
+  addExpression: function (aExpression = "", aSkipUserInput = false) {
+    // Watch expressions are UI elements which benefit from visible panes.
+    this.DebuggerView.showInstrumentsPane();
+
+    // Create the element node for the watch expression item.
+    let itemView = this._createItemView(aExpression);
+
+    // Append a watch expression item to this container.
+    let expressionItem = this.push([itemView.container], {
+      index: 0, /* specifies on which position should the item be appended */
+      attachment: {
+        view: itemView,
+        initialExpression: aExpression,
+        currentExpression: "",
+      }
+    });
+
+    // Automatically focus the new watch expression input
+    // if additional user input is desired.
+    if (!aSkipUserInput) {
+      expressionItem.attachment.view.inputNode.select();
+      expressionItem.attachment.view.inputNode.focus();
+      this.DebuggerView.Variables.parentNode.scrollTop = 0;
+    }
+    // Otherwise, add and evaluate the new watch expression immediately.
+    else {
+      this.toggleContents(false);
+      this._onBlur({ target: expressionItem.attachment.view.inputNode });
+    }
+  },
+
+  /**
+   * Changes the watch expression corresponding to the specified variable item.
+   * This function is called whenever a watch expression's code is edited in
+   * the variables view container.
+   *
+   * @param Variable aVar
+   *        The variable representing the watch expression evaluation.
+   * @param string aExpression
+   *        The new watch expression text.
+   */
+  switchExpression: function (aVar, aExpression) {
+    let expressionItem =
+      [...this].filter(i => i.attachment.currentExpression == aVar.name)[0];
+
+    // Remove the watch expression if it's going to be empty or a duplicate.
+    if (!aExpression || this.getAllStrings().indexOf(aExpression) != -1) {
+      this.deleteExpression(aVar);
+      return;
+    }
+
+    // Save the watch expression code string.
+    expressionItem.attachment.currentExpression = aExpression;
+    expressionItem.attachment.view.inputNode.value = aExpression;
+
+    // Synchronize with the controller's watch expressions store.
+    this.StackFrames.syncWatchExpressions();
+  },
+
+  /**
+   * Removes the watch expression corresponding to the specified variable item.
+   * This function is called whenever a watch expression's value is edited in
+   * the variables view container.
+   *
+   * @param Variable aVar
+   *        The variable representing the watch expression evaluation.
+   */
+  deleteExpression: function (aVar) {
+    let expressionItem =
+      [...this].filter(i => i.attachment.currentExpression == aVar.name)[0];
+
+    // Remove the watch expression.
+    this.remove(expressionItem);
+
+    // Synchronize with the controller's watch expressions store.
+    this.StackFrames.syncWatchExpressions();
+  },
+
+  /**
+   * Gets the watch expression code string for an item in this container.
+   *
+   * @param number aIndex
+   *        The index used to identify the watch expression.
+   * @return string
+   *         The watch expression code string.
+   */
+  getString: function (aIndex) {
+    return this.getItemAtIndex(aIndex).attachment.currentExpression;
+  },
+
+  /**
+   * Gets the watch expressions code strings for all items in this container.
+   *
+   * @return array
+   *         The watch expressions code strings.
+   */
+  getAllStrings: function () {
+    return this.items.map(e => e.attachment.currentExpression);
+  },
+
+  /**
+   * Customization function for creating an item's UI.
+   *
+   * @param string aExpression
+   *        The watch expression string.
+   */
+  _createItemView: function (aExpression) {
+    let container = document.createElement("hbox");
+    container.className = "list-widget-item dbg-expression";
+    container.setAttribute("align", "center");
+
+    let arrowNode = document.createElement("hbox");
+    arrowNode.className = "dbg-expression-arrow";
+
+    let inputNode = document.createElement("textbox");
+    inputNode.className = "plain dbg-expression-input devtools-monospace";
+    inputNode.setAttribute("value", aExpression);
+    inputNode.setAttribute("flex", "1");
+
+    let closeNode = document.createElement("toolbarbutton");
+    closeNode.className = "plain variables-view-delete";
+
+    closeNode.addEventListener("click", this._onClose, false);
+    inputNode.addEventListener("blur", this._onBlur, false);
+    inputNode.addEventListener("keypress", this._onKeyPress, false);
+
+    container.appendChild(arrowNode);
+    container.appendChild(inputNode);
+    container.appendChild(closeNode);
+
+    return {
+      container: container,
+      arrowNode: arrowNode,
+      inputNode: inputNode,
+      closeNode: closeNode
+    };
+  },
+
+  /**
+   * Called when the add watch expression key sequence was pressed.
+   */
+  _onCmdAddExpression: function (aText) {
+    // Only add a new expression if there's no pending input.
+    if (this.getAllStrings().indexOf("") == -1) {
+      this.addExpression(aText || this.DebuggerView.editor.getSelection());
+    }
+  },
+
+  /**
+   * Called when the remove all watch expressions key sequence was pressed.
+   */
+  _onCmdRemoveAllExpressions: function () {
+    // Empty the view of all the watch expressions and clear the cache.
+    this.empty();
+
+    // Synchronize with the controller's watch expressions store.
+    this.StackFrames.syncWatchExpressions();
+  },
+
+  /**
+   * The click listener for this container.
+   */
+  _onClick: function (e) {
+    if (e.button != 0) {
+      // Only allow left-click to trigger this event.
+      return;
+    }
+    let expressionItem = this.getItemForElement(e.target);
+    if (!expressionItem) {
+      // The container is empty or we didn't click on an actual item.
+      this.addExpression();
+    }
+  },
+
+  /**
+   * The click listener for a watch expression's close button.
+   */
+  _onClose: function (e) {
+    // Remove the watch expression.
+    this.remove(this.getItemForElement(e.target));
+
+    // Synchronize with the controller's watch expressions store.
+    this.StackFrames.syncWatchExpressions();
+
+    // Prevent clicking the expression element itself.
+    e.preventDefault();
+    e.stopPropagation();
+  },
+
+  /**
+   * The blur listener for a watch expression's textbox.
+   */
+  _onBlur: function ({ target: textbox }) {
+    let expressionItem = this.getItemForElement(textbox);
+    let oldExpression = expressionItem.attachment.currentExpression;
+    let newExpression = textbox.value.trim();
+
+    // Remove the watch expression if it's empty.
+    if (!newExpression) {
+      this.remove(expressionItem);
+    }
+    // Remove the watch expression if it's a duplicate.
+    else if (!oldExpression && this.getAllStrings().indexOf(newExpression) != -1) {
+      this.remove(expressionItem);
+    }
+    // Expression is eligible.
+    else {
+      expressionItem.attachment.currentExpression = newExpression;
+    }
+
+    // Synchronize with the controller's watch expressions store.
+    this.StackFrames.syncWatchExpressions();
+  },
+
+  /**
+   * The keypress listener for a watch expression's textbox.
+   */
+  _onKeyPress: function (e) {
+    switch (e.keyCode) {
+      case KeyCodes.DOM_VK_RETURN:
+      case KeyCodes.DOM_VK_ESCAPE:
+        e.stopPropagation();
+        this.DebuggerView.editor.focus();
+    }
+  }
+});
+
+DebuggerView.WatchExpressions = new WatchExpressionsView(DebuggerController,
+                                                         DebuggerView);