Add tooltip if any in annotations layer

src/core/annotation.js

@@ -1533,6 +1533,7 @@ class ButtonWidgetAnnotation extends WidgetAnnotation {
       this.hasFieldFlag(AnnotationFieldFlag.RADIO) &&
       !this.hasFieldFlag(AnnotationFieldFlag.PUSHBUTTON);
     this.data.pushButton = this.hasFieldFlag(AnnotationFieldFlag.PUSHBUTTON);
+    this.data.isTooltipOnly = false;
 
     if (this.data.checkBox) {
       this._processCheckBox(params);
@@ -1770,11 +1771,13 @@ class ButtonWidgetAnnotation extends WidgetAnnotation {
   }
 
   _processPushButton(params) {
-    if (!params.dict.has("A")) {
+    if (!params.dict.has("A") && !this.data.alternativeText) {
       warn("Push buttons without action dictionaries are not supported");
       return;
     }
 
+    this.data.isTooltipOnly = !params.dict.has("A");
+
     Catalog.parseDestDictionary({
       destDict: params.dict,
       resultObj: this.data,

src/display/annotation_layer.js

@@ -293,7 +293,8 @@ class LinkAnnotationElement extends AnnotationElement {
     const isRenderable = !!(
       parameters.data.url ||
       parameters.data.dest ||
-      parameters.data.action
+      parameters.data.action ||
+      parameters.data.isTooltipOnly
     );
     super(parameters, isRenderable);
   }
@@ -322,8 +323,10 @@ class LinkAnnotationElement extends AnnotationElement {
       });
     } else if (data.action) {
       this._bindNamedAction(link, data.action);
-    } else {
+    } else if (data.dest) {
       this._bindLink(link, data.dest);
+    } else {
+      this._bindLink(link, "");
     }
 
     this.container.appendChild(link);
@@ -420,6 +423,10 @@ class WidgetAnnotationElement extends AnnotationElement {
    */
   render() {
     // Show only the container for unsupported field types.
+    if (this.data.alternativeText) {
+      this.container.title = this.data.alternativeText;
+    }
+
     return this.container;
   }
 }
@@ -647,6 +654,11 @@ class PushButtonWidgetAnnotationElement extends LinkAnnotationElement {
     // as performing actions on form fields (resetting, submitting, et cetera).
     const container = super.render();
     container.className = "buttonWidgetAnnotation pushButton";
+
+    if (this.data.alternativeText) {
+      container.title = this.data.alternativeText;
+    }
+
     return container;
   }
 }

test/unit/annotation_spec.js

@@ -2436,6 +2436,49 @@ describe("annotation", function () {
         })
         .catch(done.fail);
     });
+
+    it("should handle push buttons", function (done) {
+      const buttonWidgetRef = Ref.get(124, 0);
+      buttonWidgetDict.set("Ff", AnnotationFieldFlag.PUSHBUTTON);
+      buttonWidgetDict.set("A", "whatever");
+
+      const xref = new XRefMock([
+        { ref: buttonWidgetRef, data: buttonWidgetDict },
+      ]);
+
+      AnnotationFactory.create(
+        xref,
+        buttonWidgetRef,
+        pdfManagerMock,
+        idFactoryMock
+      ).then(({ data }) => {
+        expect(data.annotationType).toEqual(AnnotationType.WIDGET);
+        expect(data.pushButton).toEqual(true);
+        done();
+      }, done.fail);
+    });
+
+    it("should handle push buttons that act as a tooltip only", function (done) {
+      const buttonWidgetRef = Ref.get(124, 0);
+      buttonWidgetDict.set("Ff", AnnotationFieldFlag.PUSHBUTTON);
+      buttonWidgetDict.set("TU", "An alternative text");
+
+      const xref = new XRefMock([
+        { ref: buttonWidgetRef, data: buttonWidgetDict },
+      ]);
+
+      AnnotationFactory.create(
+        xref,
+        buttonWidgetRef,
+        pdfManagerMock,
+        idFactoryMock
+      ).then(({ data }) => {
+        expect(data.annotationType).toEqual(AnnotationType.WIDGET);
+        expect(data.pushButton).toEqual(true);
+        expect(data.alternativeText).toEqual("An alternative text");
+        done();
+      }, done.fail);
+    });
   });
 
   describe("ChoiceWidgetAnnotation", function () {