1 files changed, 235 insertions, 0 deletions
diff --git a/modules/FormSubmitObserver.jsm b/modules/FormSubmitObserver.jsm
new file mode 100644
index 0000000..6b2ea3c
--- /dev/null
+++ b/modules/FormSubmitObserver.jsm
@@ -0,0 +1,235 @@
+/* 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/. */
+
+/*
+ * Handles the validation callback from nsIFormFillController and
+ * the display of the help panel on invalid elements.
+ */
+
+"use strict";
+
+var Cc = Components.classes;
+var Ci = Components.interfaces;
+var Cu = Components.utils;
+
+var HTMLInputElement = Ci.nsIDOMHTMLInputElement;
+var HTMLTextAreaElement = Ci.nsIDOMHTMLTextAreaElement;
+var HTMLSelectElement = Ci.nsIDOMHTMLSelectElement;
+var HTMLButtonElement = Ci.nsIDOMHTMLButtonElement;
+
+this.EXPORTED_SYMBOLS = [ "FormSubmitObserver" ];
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/BrowserUtils.jsm");
+
+function FormSubmitObserver(aWindow, aTabChildGlobal) {
+  this.init(aWindow, aTabChildGlobal);
+}
+
+FormSubmitObserver.prototype =
+{
+  _validationMessage: "",
+  _content: null,
+  _element: null,
+
+  /*
+   * Public apis
+   */
+
+  init: function(aWindow, aTabChildGlobal)
+  {
+    this._content = aWindow;
+    this._tab = aTabChildGlobal;
+    this._mm = 
+      this._content.QueryInterface(Ci.nsIInterfaceRequestor)
+                   .getInterface(Ci.nsIDocShell)
+                   .sameTypeRootTreeItem
+                   .QueryInterface(Ci.nsIDocShell)
+                   .QueryInterface(Ci.nsIInterfaceRequestor)
+                   .getInterface(Ci.nsIContentFrameMessageManager);
+
+    // nsIFormSubmitObserver callback about invalid forms. See HTMLFormElement
+    // for details.
+    Services.obs.addObserver(this, "invalidformsubmit", false);
+    this._tab.addEventListener("pageshow", this, false);
+    this._tab.addEventListener("unload", this, false);
+  },
+
+  uninit: function()
+  {
+    Services.obs.removeObserver(this, "invalidformsubmit");
+    this._content.removeEventListener("pageshow", this, false);
+    this._content.removeEventListener("unload", this, false);
+    this._mm = null;
+    this._element = null;
+    this._content = null;
+    this._tab = null;
+  },
+
+  /*
+   * Events
+   */
+
+  handleEvent: function (aEvent) {
+    switch (aEvent.type) {
+      case "pageshow":
+        if (this._isRootDocumentEvent(aEvent)) {
+          this._hidePopup();
+        }
+        break;
+      case "unload":
+        this.uninit();
+        break;
+      case "input":
+        this._onInput(aEvent);
+        break;
+      case "blur":
+        this._onBlur(aEvent);
+        break;
+    }
+  },
+
+  /*
+   * nsIFormSubmitObserver
+   */
+
+  notifyInvalidSubmit : function (aFormElement, aInvalidElements)
+  {
+    // We are going to handle invalid form submission attempt by focusing the
+    // first invalid element and show the corresponding validation message in a
+    // panel attached to the element.
+    if (!aInvalidElements.length) {
+      return;
+    }
+    
+    // Ensure that this is the FormSubmitObserver associated with the
+    // element / window this notification is about.
+    let element = aInvalidElements.queryElementAt(0, Ci.nsISupports);
+    if (this._content != element.ownerGlobal.top.document.defaultView) {
+      return;
+    }
+
+    if (!(element instanceof HTMLInputElement ||
+          element instanceof HTMLTextAreaElement ||
+          element instanceof HTMLSelectElement ||
+          element instanceof HTMLButtonElement)) {
+      return;
+    }
+
+    // Update validation message before showing notification
+    this._validationMessage = element.validationMessage;
+
+    // Don't connect up to the same element more than once.
+    if (this._element == element) {
+      this._showPopup(element);
+      return;
+    }
+    this._element = element;
+
+    element.focus();
+
+    // Watch for input changes which may change the validation message.
+    element.addEventListener("input", this, false);
+
+    // Watch for focus changes so we can disconnect our listeners and
+    // hide the popup.
+    element.addEventListener("blur", this, false);
+
+    this._showPopup(element);
+  },
+
+  /*
+   * Internal
+   */
+  
+  /*
+   * Handles input changes on the form element we've associated a popup
+   * with. Updates the validation message or closes the popup if form data
+   * becomes valid.
+   */
+  _onInput: function (aEvent) {
+    let element = aEvent.originalTarget;
+
+    // If the form input is now valid, hide the popup.
+    if (element.validity.valid) {
+      this._hidePopup();
+      return;
+    }
+
+    // If the element is still invalid for a new reason, we should update
+    // the popup error message.
+    if (this._validationMessage != element.validationMessage) {
+      this._validationMessage = element.validationMessage;
+      this._showPopup(element);
+    }
+  },
+
+  /*
+   * Blur event handler in which we disconnect from the form element and
+   * hide the popup.
+   */
+  _onBlur: function (aEvent) {
+    aEvent.originalTarget.removeEventListener("input", this, false);
+    aEvent.originalTarget.removeEventListener("blur", this, false);
+    this._element = null;
+    this._hidePopup();
+  },
+
+  /*
+   * Send the show popup message to chrome with appropriate position
+   * information. Can be called repetitively to update the currently
+   * displayed popup position and text.
+   */
+  _showPopup: function (aElement) {
+    // Collect positional information and show the popup
+    let panelData = {};
+
+    panelData.message = this._validationMessage;
+
+    // Note, this is relative to the browser and needs to be translated
+    // in chrome.
+    panelData.contentRect = BrowserUtils.getElementBoundingRect(aElement);
+
+    // We want to show the popup at the middle of checkbox and radio buttons
+    // and where the content begin for the other elements.
+    let offset = 0;
+
+    if (aElement.tagName == 'INPUT' &&
+        (aElement.type == 'radio' || aElement.type == 'checkbox')) {
+      panelData.position = "bottomcenter topleft";
+    } else {
+      let win = aElement.ownerGlobal;
+      let style = win.getComputedStyle(aElement, null);
+      if (style.direction == 'rtl') {
+        offset = parseInt(style.paddingRight) + parseInt(style.borderRightWidth);
+      } else {
+        offset = parseInt(style.paddingLeft) + parseInt(style.borderLeftWidth);
+      }
+      let zoomFactor = this._getWindowUtils().fullZoom;
+      panelData.offset = Math.round(offset * zoomFactor);
+      panelData.position = "after_start";
+    }
+    this._mm.sendAsyncMessage("FormValidation:ShowPopup", panelData);
+  },
+
+  _hidePopup: function () {
+    this._mm.sendAsyncMessage("FormValidation:HidePopup", {});
+  },
+
+  _getWindowUtils: function () {
+    return this._content.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
+  },
+
+  _isRootDocumentEvent: function (aEvent) {
+    if (this._content == null) {
+      return true;
+    }
+    let target = aEvent.originalTarget;
+    return (target == this._content.document ||
+            (target.ownerDocument && target.ownerDocument == this._content.document));
+  },
+
+  QueryInterface : XPCOMUtils.generateQI([Ci.nsIFormSubmitObserver])
+};