The Tor Browser: browser/metro/base/content/contenthandlers/FormHelper.js@6474c204b198 (annotated)

browser/metro/base/content/contenthandlers/FormHelper.js@6474c204b198 (annotated)

browser/metro/base/content/contenthandlers/FormHelper.js

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 // -*- Mode: js2; tab-width: 2; indent-tabs-mode: nil; js2-basic-offset: 2; js2-skip-preprocessor-directives: t; -*-
 /* 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/. */
 let Ci = Components.interfaces;
 let Cc = Components.classes;
 dump("### FormHelper.js loaded\n");
 let HTMLTextAreaElement = Ci.nsIDOMHTMLTextAreaElement;
 let HTMLInputElement = Ci.nsIDOMHTMLInputElement;
 let HTMLSelectElement = Ci.nsIDOMHTMLSelectElement;
 let HTMLIFrameElement = Ci.nsIDOMHTMLIFrameElement;
 let HTMLDocument = Ci.nsIDOMHTMLDocument;
 let HTMLHtmlElement = Ci.nsIDOMHTMLHtmlElement;
 let HTMLBodyElement = Ci.nsIDOMHTMLBodyElement;
 let HTMLLabelElement = Ci.nsIDOMHTMLLabelElement;
 let HTMLButtonElement = Ci.nsIDOMHTMLButtonElement;
 let HTMLOptGroupElement = Ci.nsIDOMHTMLOptGroupElement;
 let HTMLOptionElement = Ci.nsIDOMHTMLOptionElement;
 let XULMenuListElement = Ci.nsIDOMXULMenuListElement;
 /**
  * Responsible of navigation between forms fields and of the opening of the assistant
  */
 function FormAssistant() {
   addMessageListener("FormAssist:Closed", this);
   addMessageListener("FormAssist:ChoiceSelect", this);
   addMessageListener("FormAssist:ChoiceChange", this);
   addMessageListener("FormAssist:AutoComplete", this);
   addMessageListener("FormAssist:Update", this);
   /* Listen text events in order to update the autocomplete suggestions as soon
    * a key is entered on device
    */
   addEventListener("text", this, false);
   addEventListener("focus", this, true);
   addEventListener("blur", this, true);
   addEventListener("pageshow", this, false);
   addEventListener("pagehide", this, false);
   addEventListener("submit", this, false);
 }
 FormAssistant.prototype = {
   _els: Cc["@mozilla.org/eventlistenerservice;1"].getService(Ci.nsIEventListenerService),
   _open: false,
   _focusSync: false,
   _debugEvents: false,
   _selectWrapper: null,
   _currentElement: null,
   invalidSubmit: false,
   get focusSync() {
     return this._focusSync;
   },
   set focusSync(aVal) {
     this._focusSync = aVal;
   },
   get currentElement() {
     return this._currentElement;
   },
   set currentElement(aElement) {
     if (!aElement || !this._isVisibleElement(aElement)) {
       return null;
     }
     this._currentElement = aElement;
     gFocusManager.setFocus(this._currentElement, Ci.nsIFocusManager.FLAG_NOSCROLL);
     // To ensure we get the current caret positionning of the focused
     // element we need to delayed a bit the event
     this._executeDelayed(function(self) {
       // Bug 640870
       // Sometimes the element inner frame get destroyed while the element
       // receive the focus because the display is turned to 'none' for
       // example, in this "fun" case just do nothing if the element is hidden
       if (self._isVisibleElement(gFocusManager.focusedElement)) {
         self._sendJsonMsgWrapper("FormAssist:Show");
       }
     });
     return this._currentElement;
   },
   open: function formHelperOpen(aElement, aEvent) {
     // If the click is on an option element we want to check if the parent
     // is a valid target.
     if (aElement instanceof HTMLOptionElement &&
         aElement.parentNode instanceof HTMLSelectElement &&
         !aElement.disabled) {
       aElement = aElement.parentNode;
     }
     // Don't show the formhelper popup for multi-select boxes, except for touch.
     if (aElement instanceof HTMLSelectElement && aEvent) {
       if ((aElement.multiple || aElement.size > 1) &&
           aEvent.mozInputSource != Ci.nsIDOMMouseEvent.MOZ_SOURCE_TOUCH) {
         return false;
       }
       // Don't fire mouse events on selects; see bug 685197.
       aEvent.preventDefault();
       aEvent.stopPropagation();
     }
     // The form assistant will close if a click happen:
     // * outside of the scope of the form helper
     // * hover a button of type=[image|submit]
     // * hover a disabled element
     if (!this._isValidElement(aElement)) {
       let passiveButtons = { button: true, checkbox: true, file: true, radio: true, reset: true };
       if ((aElement instanceof HTMLInputElement || aElement instanceof HTMLButtonElement) &&
           passiveButtons[aElement.type] && !aElement.disabled)
         return false;
       return this.close();
     }
     // Look for a top editable element
     if (this._isEditable(aElement)) {
       aElement = this._getTopLevelEditable(aElement);
     }
     // We only work with choice lists or elements with autocomplete suggestions
     if (!this._isSelectElement(aElement) &&
         !this._isAutocomplete(aElement)) {
       return this.close();
     }
     // Don't re-open when navigating to avoid repopulating list when changing selection.
     if (this._isAutocomplete(aElement) && this._open && Util.isNavigationKey(aEvent.keyCode)) {
       return false;
     }
     // Enable the assistant
     this.currentElement = aElement;
     return this._open = true;
   },
   close: function close() {
     if (this._open) {
       this._currentElement = null;
       sendAsyncMessage("FormAssist:Hide", { });
       this._open = false;
     }
     return this._open;
   },
   receiveMessage: function receiveMessage(aMessage) {
     if (this._debugEvents) Util.dumpLn(aMessage.name);
     let currentElement = this.currentElement;
     if ((!this._isAutocomplete(currentElement) &&
          !getWrapperForElement(currentElement)) ||
         !currentElement) {
       return;
     }
     let json = aMessage.json;
     switch (aMessage.name) {
       case "FormAssist:ChoiceSelect": {
         this._selectWrapper = getWrapperForElement(currentElement);
         this._selectWrapper.select(json.index, json.selected);
         break;
       }
       case "FormAssist:ChoiceChange": {
         // ChoiceChange could happened once we have move to another element or
         // to nothing, so we should keep the used wrapper in mind.
         this._selectWrapper = getWrapperForElement(currentElement);
         this._selectWrapper.fireOnChange();
         // New elements can be shown when a select is updated so we need to
         // reconstruct the inner elements array and to take care of possible
         // focus change, this is why we use "self.currentElement" instead of
         // using directly "currentElement".
         this._executeDelayed(function(self) {
           let currentElement = self.currentElement;
           if (!currentElement)
             return;
           self._currentElement = currentElement;
         });
         break;
       }
       case "FormAssist:AutoComplete": {
         try {
           currentElement = currentElement.QueryInterface(Ci.nsIDOMNSEditableElement);
           let imeEditor = currentElement.editor.QueryInterface(Ci.nsIEditorIMESupport);
           if (imeEditor.composing)
             imeEditor.forceCompositionEnd();
         }
         catch(e) {}
         currentElement.value = json.value;
         let event = currentElement.ownerDocument.createEvent("Events");
         event.initEvent("DOMAutoComplete", true, true);
         currentElement.dispatchEvent(event);
         break;
       }
       case "FormAssist:Closed":
         currentElement.blur();
         this._open = false;
         break;
       case "FormAssist:Update":
         this._sendJsonMsgWrapper("FormAssist:Show");
         break;
     }
   },
   handleEvent: function formHelperHandleEvent(aEvent) {
     if (this._debugEvents) Util.dumpLn(aEvent.type, this.currentElement);
     // focus changes should be taken into account only if the user has done a
     // manual operation like manually clicking
     let shouldIgnoreFocus = (aEvent.type == "focus" && !this._open && !this.focusSync);
     if ((!this._open && aEvent.type != "focus") || shouldIgnoreFocus) {
       return;
     }
     let currentElement = this.currentElement;
     switch (aEvent.type) {
       case "submit":
         // submit is a final action and the form assistant should be closed
         this.close();
         break;
       case "pagehide":
       case "pageshow":
         // When reacting to a page show/hide, if the focus is different this
         // could mean the web page has dramatically changed because of
         // an Ajax change based on fragment identifier
         if (gFocusManager.focusedElement != currentElement)
           this.close();
         break;
       case "focus":
         let focusedElement =
           gFocusManager.getFocusedElementForWindow(content, true, {}) ||
           aEvent.target;
         // If a body element is editable and the body is the child of an
         // iframe we can assume this is an advanced HTML editor, so let's
         // redirect the form helper selection to the iframe element
         if (focusedElement && this._isEditable(focusedElement)) {
           let editableElement = this._getTopLevelEditable(focusedElement);
           if (this._isValidElement(editableElement)) {
             this._executeDelayed(function(self) {
               self.open(editableElement);
             });
           }
           return;
         }
         // if an element is focused while we're closed but the element can be handle
         // by the assistant, try to activate it (only during mouseup)
         if (!currentElement) {
           if (focusedElement && this._isValidElement(focusedElement)) {
             this._executeDelayed(function(self) {
               self.open(focusedElement);
             });
           }
           return;
         }
         if (this._currentElement != focusedElement)
           this.currentElement = focusedElement;
         break;
       case "blur":
         content.setTimeout(function(self) {
           if (!self._open)
             return;
           // If the blurring causes focus be in no other element,
           // we should close the form assistant.
           let focusedElement = gFocusManager.getFocusedElementForWindow(content, true, {});
           if (!focusedElement)
             self.close();
         }, 0, this);
         break;
       case "text":
         if (this._isAutocomplete(aEvent.target)) {
           this._sendJsonMsgWrapper("FormAssist:AutoComplete");
         }
         break;
     }
   },
   _executeDelayed: function formHelperExecuteSoon(aCallback) {
     let self = this;
     let timer = new Util.Timeout(function() {
       aCallback(self);
     });
     timer.once(0);
   },
   _isEditable: function formHelperIsEditable(aElement) {
     if (!aElement)
       return false;
     let canEdit = false;
     if (aElement.isContentEditable || aElement.designMode == "on") {
       canEdit = true;
     } else if (aElement instanceof HTMLIFrameElement &&
                (aElement.contentDocument.body.isContentEditable ||
                 aElement.contentDocument.designMode == "on")) {
       canEdit = true;
     } else {
       canEdit = aElement.ownerDocument && aElement.ownerDocument.designMode == "on";
     }
     return canEdit;
   },
   _getTopLevelEditable: function formHelperGetTopLevelEditable(aElement) {
     if (!(aElement instanceof HTMLIFrameElement)) {
       let element = aElement;
       // Retrieve the top element that is editable
       if (element instanceof HTMLHtmlElement)
         element = element.ownerDocument.body;
       else if (element instanceof HTMLDocument)
         element = element.body;
       while (element && !this._isEditable(element))
         element = element.parentNode;
       // Return the container frame if we are into a nested editable frame
       if (element && element instanceof HTMLBodyElement && element.ownerDocument.defaultView != content.document.defaultView)
         return element.ownerDocument.defaultView.frameElement;
     }
     return aElement;
   },
   _isAutocomplete: function formHelperIsAutocomplete(aElement) {
     if (aElement instanceof HTMLInputElement) {
       if (aElement.getAttribute("type") == "password")
         return false;
       let autocomplete = aElement.getAttribute("autocomplete");
       let allowedValues = ["off", "false", "disabled"];
       if (allowedValues.indexOf(autocomplete) == -1)
         return true;
     }
     return false;
   },
   /*
    * This function is similar to getListSuggestions from
    * components/satchel/src/nsInputListAutoComplete.js but sadly this one is
    * used by the autocomplete.xml binding which is not in used in fennec
    */
   _getListSuggestions: function formHelperGetListSuggestions(aElement) {
     if (!(aElement instanceof HTMLInputElement) || !aElement.list)
       return [];
     let suggestions = [];
     let filter = !aElement.hasAttribute("mozNoFilter");
     let lowerFieldValue = aElement.value.toLowerCase();
     let options = aElement.list.options;
     let length = options.length;
     for (let i = 0; i < length; i++) {
       let item = options.item(i);
       let label = item.value;
       if (item.label)
         label = item.label;
       else if (item.text)
         label = item.text;
       if (filter && label.toLowerCase().indexOf(lowerFieldValue) == -1)
         continue;
        suggestions.push({ label: label, value: item.value });
     }
     return suggestions;
   },
   _isValidElement: function formHelperIsValidElement(aElement) {
     if (!aElement.getAttribute)
       return false;
     let formExceptions = { button: true, checkbox: true, file: true, image: true, radio: true, reset: true, submit: true };
     if (aElement instanceof HTMLInputElement && formExceptions[aElement.type])
       return false;
     if (aElement instanceof HTMLButtonElement ||
         (aElement.getAttribute("role") == "button" && aElement.hasAttribute("tabindex")))
       return false;
     return this._isNavigableElement(aElement) && this._isVisibleElement(aElement);
   },
   _isNavigableElement: function formHelperIsNavigableElement(aElement) {
     if (aElement.disabled || aElement.getAttribute("tabindex") == "-1")
       return false;
     if (aElement.getAttribute("role") == "button" && aElement.hasAttribute("tabindex"))
       return true;
     if (this._isSelectElement(aElement) || aElement instanceof HTMLTextAreaElement)
       return true;
     if (aElement instanceof HTMLInputElement || aElement instanceof HTMLButtonElement)
       return !(aElement.type == "hidden");
     return this._isEditable(aElement);
   },
   _isVisibleElement: function formHelperIsVisibleElement(aElement) {
     if (!aElement || !aElement.ownerDocument) {
       return false;
     }
     let style = aElement.ownerDocument.defaultView.getComputedStyle(aElement, null);
     if (!style)
       return false;
     let isVisible = (style.getPropertyValue("visibility") != "hidden");
     let isOpaque = (style.getPropertyValue("opacity") != 0);
     let rect = aElement.getBoundingClientRect();
     // Since the only way to show a drop-down menu for a select when the form
     // assistant is enabled is to return true here, a select is allowed to have
     // an opacity to 0 in order to let web developpers add a custom design on
     // top of it. This is less important to use the form assistant for the
     // other types of fields because even if the form assistant won't fired,
     // the focus will be in and a VKB will popup if needed
     return isVisible && (isOpaque || this._isSelectElement(aElement)) && (rect.height != 0 || rect.width != 0);
   },
   _isSelectElement: function formHelperIsSelectElement(aElement) {
     return (aElement instanceof HTMLSelectElement || aElement instanceof XULMenuListElement);
   },
   /** Caret is used to input text for this element. */
   _getCaretRect: function _formHelperGetCaretRect() {
     let element = this.currentElement;
     let focusedElement = gFocusManager.getFocusedElementForWindow(content, true, {});
     if (element && (element.mozIsTextField && element.mozIsTextField(false) ||
         element instanceof HTMLTextAreaElement) && focusedElement == element && this._isVisibleElement(element)) {
       let utils = Util.getWindowUtils(element.ownerDocument.defaultView);
       let rect = utils.sendQueryContentEvent(utils.QUERY_CARET_RECT, element.selectionEnd, 0, 0, 0,
                                              utils.QUERY_CONTENT_FLAG_USE_XP_LINE_BREAK);
       if (rect) {
         let scroll = ContentScroll.getScrollOffset(element.ownerDocument.defaultView);
         return new Rect(scroll.x + rect.left, scroll.y + rect.top, rect.width, rect.height);
       }
     }
     return new Rect(0, 0, 0, 0);
   },
   /** Gets a rect bounding important parts of the element that must be seen when assisting. */
   _getRect: function _formHelperGetRect(aOptions={}) {
     const kDistanceMax = 100;
     let element = this.currentElement;
     let elRect = getBoundingContentRect(element);
     if (aOptions.alignToLabel) {
       let labels = this._getLabels();
       for (let i=0; i<labels.length; i++) {
         let labelRect = labels[i].rect;
         if (labelRect.left < elRect.left) {
           let isClose = Math.abs(labelRect.left - elRect.left) - labelRect.width < kDistanceMax &&
                         Math.abs(labelRect.top - elRect.top) - labelRect.height < kDistanceMax;
           if (isClose) {
             let width = labelRect.width + elRect.width + (elRect.left - labelRect.left - labelRect.width);
             return new Rect(labelRect.left, labelRect.top, width, elRect.height).expandToIntegers();
           }
         }
       }
     }
     return elRect;
   },
   _getLabels: function formHelperGetLabels() {
     let associatedLabels = [];
     if (!this.currentElement)
       return associatedLabels;
     let element = this.currentElement;
     let labels = element.ownerDocument.getElementsByTagName("label");
     for (let i=0; i<labels.length; i++) {
       let label = labels[i];
       if ((label.control == element || label.getAttribute("for") == element.id) && this._isVisibleElement(label)) {
         associatedLabels.push({
           rect: getBoundingContentRect(label),
           title: label.textContent
         });
       }
     }
     return associatedLabels;
   },
   _sendJsonMsgWrapper: function (aMsg) {
     let json = this._getJSON();
     if (json) {
       sendAsyncMessage(aMsg, json);
     }
   },
   _getJSON: function() {
     let element = this.currentElement;
     if (!element) {
       return null;
     }
     let choices = getListForElement(element);
     let editable = (element instanceof HTMLInputElement && element.mozIsTextField(false)) || this._isEditable(element);
     let labels = this._getLabels();
     return {
       current: {
         id: element.id,
         name: element.name,
         title: labels.length ? labels[0].title : "",
         value: element.value,
         maxLength: element.maxLength,
         type: (element.getAttribute("type") || "").toLowerCase(),
         choices: choices,
         isAutocomplete: this._isAutocomplete(element),
         list: this._getListSuggestions(element),
         rect: this._getRect(),
         caretRect: this._getCaretRect(),
         editable: editable
       },
     };
   },
   /**
    * For each radio button group, remove all but the checked button
    * if there is one, or the first button otherwise.
    */
   _filterRadioButtons: function(aNodes) {
     // First pass: Find the checked or first element in each group.
     let chosenRadios = {};
     for (let i=0; i < aNodes.length; i++) {
       let node = aNodes[i];
       if (node.type == "radio" && (!chosenRadios.hasOwnProperty(node.name) || node.checked))
         chosenRadios[node.name] = node;
     }
     // Second pass: Exclude all other radio buttons from the list.
     let result = [];
     for (let i=0; i < aNodes.length; i++) {
       let node = aNodes[i];
       if (node.type == "radio" && chosenRadios[node.name] != node)
         continue;
       result.push(node);
     }
     return result;
   }
 };
 this.FormAssistant = FormAssistant;
 /******************************************************************************
  * The next classes wraps some forms elements such as different type of list to
  * abstract the difference between html and xul element while manipulating them
  *  - SelectWrapper   : <html:select>
  *  - MenulistWrapper : <xul:menulist>
  *****************************************************************************/
 function getWrapperForElement(aElement) {
   let wrapper = null;
   if (aElement instanceof HTMLSelectElement) {
     wrapper = new SelectWrapper(aElement);
   }
   else if (aElement instanceof XULMenuListElement) {
     wrapper = new MenulistWrapper(aElement);
   }
   return wrapper;
 }
 function getListForElement(aElement) {
   let wrapper = getWrapperForElement(aElement);
   if (!wrapper)
     return null;
   let optionIndex = 0;
   let result = {
     multiple: wrapper.getMultiple(),
     choices: []
   };
   // Build up a flat JSON array of the choices. In HTML, it's possible for select element choices
   // to be under a group header (but not recursively). We distinguish between headers and entries
   // using the boolean "list.group".
   // XXX If possible, this would be a great candidate for tracing.
   let children = wrapper.getChildren();
   for (let i = 0; i < children.length; i++) {
     let child = children[i];
     if (wrapper.isGroup(child)) {
       // This is the group element. Add an entry in the choices that says that the following
       // elements are a member of this group.
       result.choices.push({ group: true,
                             text: child.label || child.firstChild.data,
                             disabled: child.disabled
                           });
       let subchildren = child.children;
       for (let j = 0; j < subchildren.length; j++) {
         let subchild = subchildren[j];
         result.choices.push({
           group: false,
           inGroup: true,
           text: wrapper.getText(subchild),
           disabled: child.disabled || subchild.disabled,
           selected: subchild.selected,
           optionIndex: optionIndex++
         });
       }
     }
     else if (wrapper.isOption(child)) {
       // This is a regular choice under no group.
       result.choices.push({
         group: false,
         inGroup: false,
         text: wrapper.getText(child),
         disabled: child.disabled,
         selected: child.selected,
         optionIndex: optionIndex++
       });
     }
   }
   return result;
 }
 function SelectWrapper(aControl) {
   this._control = aControl;
 }
 SelectWrapper.prototype = {
   getSelectedIndex: function() {
     return this._control.selectedIndex;
   },
   getMultiple: function() {
     return this._control.multiple;
   },
   getOptions: function() {
     return this._control.options;
   },
   getChildren: function() {
     return this._control.children;
   },
   getText: function(aChild) {
     return aChild.text;
   },
   isOption: function(aChild) {
     return aChild instanceof HTMLOptionElement;
   },
   isGroup: function(aChild) {
     return aChild instanceof HTMLOptGroupElement;
   },
   select: function(aIndex, aSelected) {
     let options = this._control.options;
     if (this.getMultiple())
       options[aIndex].selected = aSelected;
     else
       options.selectedIndex = aIndex;
   },
   fireOnChange: function() {
     let control = this._control;
     let evt = this._control.ownerDocument.createEvent("Events");
     evt.initEvent("change", true, true, this._control.ownerDocument.defaultView, 0,
                   false, false,
                   false, false, null);
     content.setTimeout(function() {
       control.dispatchEvent(evt);
     }, 0);
   }
 };
 this.SelectWrapper = SelectWrapper;
 // bug 559792
 // Use wrappedJSObject when control is in content for extra protection
 function MenulistWrapper(aControl) {
   this._control = aControl;
 }
 MenulistWrapper.prototype = {
   getSelectedIndex: function() {
     let control = this._control.wrappedJSObject || this._control;
     let result = control.selectedIndex;
     return ((typeof result == "number" && !isNaN(result)) ? result : -1);
   },
   getMultiple: function() {
     return false;
   },
   getOptions: function() {
     let control = this._control.wrappedJSObject || this._control;
     return control.menupopup.children;
   },
   getChildren: function() {
     let control = this._control.wrappedJSObject || this._control;
     return control.menupopup.children;
   },
   getText: function(aChild) {
     return aChild.label;
   },
   isOption: function(aChild) {
     return aChild instanceof Ci.nsIDOMXULSelectControlItemElement;
   },
   isGroup: function(aChild) {
     return false;
   },
   select: function(aIndex, aSelected) {
     let control = this._control.wrappedJSObject || this._control;
     control.selectedIndex = aIndex;
   },
   fireOnChange: function() {
     let control = this._control;
     let evt = document.createEvent("XULCommandEvent");
     evt.initCommandEvent("command", true, true, window, 0,
                          false, false,
                          false, false, null);
     content.setTimeout(function() {
       control.dispatchEvent(evt);
     }, 0);
   }
 };
 this.MenulistWrapper = MenulistWrapper;