Merge pull request #7596 from timvandermeij/widget-annotation-cleanup

Improve the structure for widget annotations

src/core/annotation.js

@@ -98,9 +98,14 @@ AnnotationFactory.prototype = /** @lends AnnotationFactory.prototype */ {
 
       case 'Widget':
         var fieldType = Util.getInheritableProperty(dict, 'FT');
-        if (isName(fieldType, 'Tx')) {
+        fieldType = isName(fieldType) ? fieldType.name : null;
-          return new TextWidgetAnnotation(parameters);
+
+        switch (fieldType) {
+          case 'Tx':
+            return new TextWidgetAnnotation(parameters);
         }
+        warn('Unimplemented widget field type "' + fieldType + '", ' +
+             'falling back to base field type.');
         return new WidgetAnnotation(parameters);
 
       case 'Popup':
@@ -615,13 +620,12 @@ var WidgetAnnotation = (function WidgetAnnotationClosure() {
     data.alternativeText = stringToPDFString(dict.get('TU') || '');
     data.defaultAppearance = Util.getInheritableProperty(dict, 'DA') || '';
     var fieldType = Util.getInheritableProperty(dict, 'FT');
-    data.fieldType = isName(fieldType) ? fieldType.name : '';
+    data.fieldType = isName(fieldType) ? fieldType.name : null;
     data.fieldFlags = Util.getInheritableProperty(dict, 'Ff') || 0;
     this.fieldResources = Util.getInheritableProperty(dict, 'DR') || Dict.empty;
 
-    // Hide unsupported Widget signatures.
+    // Hide signatures because we cannot validate them.
     if (data.fieldType === 'Sig') {
-      warn('unimplemented annotation type: Widget signature');
       this.setFlags(AnnotationFlag.HIDDEN);
     }
 

src/display/annotation_layer.js

@@ -69,6 +69,12 @@ AnnotationElementFactory.prototype =
         return new TextAnnotationElement(parameters);
 
       case AnnotationType.WIDGET:
+        var fieldType = parameters.data.fieldType;
+
+        switch (fieldType) {
+          case 'Tx':
+            return new TextWidgetAnnotationElement(parameters);
+        }
         return new WidgetAnnotationElement(parameters);
 
       case AnnotationType.POPUP:
@@ -392,9 +398,7 @@ var TextAnnotationElement = (function TextAnnotationElementClosure() {
  */
 var WidgetAnnotationElement = (function WidgetAnnotationElementClosure() {
   function WidgetAnnotationElement(parameters) {
-    var isRenderable = !parameters.data.hasAppearance &&
+    AnnotationElement.call(this, parameters, true);
-                       !!parameters.data.fieldValue;
-    AnnotationElement.call(this, parameters, isRenderable);
   }
 
   Util.inherit(WidgetAnnotationElement, AnnotationElement, {
@@ -406,6 +410,33 @@ var WidgetAnnotationElement = (function WidgetAnnotationElementClosure() {
      * @returns {HTMLSectionElement}
      */
     render: function WidgetAnnotationElement_render() {
+      // Show only the container for unsupported field types.
+      return this.container;
+    }
+  });
+
+  return WidgetAnnotationElement;
+})();
+
+/**
+ * @class
+ * @alias TextWidgetAnnotationElement
+ */
+var TextWidgetAnnotationElement = (
+    function TextWidgetAnnotationElementClosure() {
+  function TextWidgetAnnotationElement(parameters) {
+    WidgetAnnotationElement.call(this, parameters);
+  }
+
+  Util.inherit(TextWidgetAnnotationElement, WidgetAnnotationElement, {
+    /**
+     * Render the text widget annotation's HTML element in the empty container.
+     *
+     * @public
+     * @memberof TextWidgetAnnotationElement
+     * @returns {HTMLSectionElement}
+     */
+    render: function TextWidgetAnnotationElement_render() {
       var content = document.createElement('div');
       content.textContent = this.data.fieldValue;
       var textAlignment = this.data.textAlignment;
@@ -427,10 +458,10 @@ var WidgetAnnotationElement = (function WidgetAnnotationElementClosure() {
      * @private
      * @param {HTMLDivElement} element
      * @param {Object} font
-     * @memberof WidgetAnnotationElement
+     * @memberof TextWidgetAnnotationElement
      */
     _setTextStyle:
-        function WidgetAnnotationElement_setTextStyle(element, font) {
+        function TextWidgetAnnotationElement_setTextStyle(element, font) {
       // TODO: This duplicates some of the logic in CanvasGraphics.setFont().
       var style = element.style;
       style.fontSize = this.data.fontSize + 'px';
@@ -452,7 +483,7 @@ var WidgetAnnotationElement = (function WidgetAnnotationElementClosure() {
     }
   });
 
-  return WidgetAnnotationElement;
+  return TextWidgetAnnotationElement;
 })();
 
 /**