init eraser

Author: Victor Nazzaro

src/UI/eraser.js

@@ -0,0 +1,32 @@
+import PDFJSAnnotate from '../PDFJSAnnotate';
+import {
+  findAnnotationAtPoint,
+  findSVGAtPoint
+} from './utils';
+
+let _canerase = false;
+
+function handleDocumentMouseDown(e){
+  _canerase = true;
+}
+
+function handleDocumentMouseUp(e){
+  _canerase = false;
+}
+
+function handleDocumentMouseMove(e){
+  if(_canerase){
+    let target = findAnnotationAtPoint(e.clientX, e.clientY);
+    console.log(target);
+  }
+}
+
+export function enableEraser(){
+  document.addEventListener('mousemove', handleDocumentMouseMove);
+  document.addEventListener('mousedown', handleDocumentMouseDown);
+  document.addEventListener('mouseup', handleDocumentMouseUp);
+}
+
+export function disableEraser(){
+  document.removeEventListener('mousemove', handleDocumentMouseMove);
+}

src/UI/index.js

@@ -1,6 +1,7 @@
 import { addEventListener, removeEventListener, fireEvent } from './event';
 import { disableEdit, enableEdit } from './edit';
 import { disablePen, enablePen, setPen } from './pen';
+import { enableEraser, disableEraser } from './eraser';
 import { disableArrow, enableArrow, setArrow } from './arrow';
 import { disablePoint, enablePoint } from './point';
 import { disableRect, enableRect } from './rect';
@@ -12,6 +13,7 @@ export default {
   addEventListener, removeEventListener, fireEvent,
   disableEdit, enableEdit,
   disablePen, enablePen, setPen,
+  enableEraser, disableEraser,
   disablePoint, enablePoint,
   disableRect, enableRect,
   disableCircle, enableCircle, setCircle, addCircle,

web/index.js

@@ -278,6 +278,9 @@ render();
           break;
         case 'area':
         case 'highlight':
+        // Using highlight as eraser for testing purposes
+          UI.disableEraser();
+          break;
         case 'strikeout':
           UI.disableRect();
           break;
@@ -315,6 +318,8 @@ render();
         break;
       case 'area':
       case 'highlight':
+        UI.enableEraser();
+        break;
       case 'strikeout':
         UI.enableRect(type);
         break;