add longtaplistener

Author: mclillill

android-pdf-viewer/src/main/java/com/github/barteksc/pdfviewer/DragPinchManager.java

@@ -184,7 +184,7 @@ private void onScrollEnd(MotionEvent event) {
 
     @Override
     public void onLongPress(MotionEvent e) {
-
+        boolean onLongTapHandled = pdfView.callbacks.callOnLongTap(e);
     }
 
     @Override

android-pdf-viewer/src/main/java/com/github/barteksc/pdfviewer/PDFView.java

@@ -45,6 +45,7 @@
 import com.github.barteksc.pdfviewer.listener.OnPageScrollListener;
 import com.github.barteksc.pdfviewer.listener.OnRenderListener;
 import com.github.barteksc.pdfviewer.listener.OnTapListener;
+import com.github.barteksc.pdfviewer.listener.OnLongTapListener;
 import com.github.barteksc.pdfviewer.model.PagePart;
 import com.github.barteksc.pdfviewer.scroll.ScrollHandle;
 import com.github.barteksc.pdfviewer.source.AssetSource;
@@ -1163,6 +1164,8 @@ public class Configurator {
 
         private OnTapListener onTapListener;
 
+        private OnLongTapListener onLongTapListener;
+
         private OnPageErrorListener onPageErrorListener;
 
         private LinkHandler linkHandler = new DefaultLinkHandler(PDFView.this);
@@ -1252,6 +1255,11 @@ public Configurator onTap(OnTapListener onTapListener) {
             return this;
         }
 
+        public Configurator onLongTap(OnLongTapListener onLongTapListener) {
+            this.onLongTapListener = onLongTapListener;
+            return this;
+        }
+
         public Configurator linkHandler(LinkHandler linkHandler) {
             this.linkHandler = linkHandler;
             return this;
@@ -1306,6 +1314,7 @@ public void load() {
             PDFView.this.callbacks.setOnPageScroll(onPageScrollListener);
             PDFView.this.callbacks.setOnRender(onRenderListener);
             PDFView.this.callbacks.setOnTap(onTapListener);
+            PDFView.this.callbacks.setOnLongTap(onLongTapListener);
             PDFView.this.callbacks.setOnPageError(onPageErrorListener);
             PDFView.this.callbacks.setLinkHandler(linkHandler);
             PDFView.this.setSwipeEnabled(enableSwipe);

android-pdf-viewer/src/main/java/com/github/barteksc/pdfviewer/listener/Callbacks.java

@@ -64,6 +64,11 @@ public class Callbacks {
      */
     private OnTapListener onTapListener;
 
+    /**
+     * Call back object to call when the user does a long tap gesture
+     */
+    private OnLongTapListener onLongTapListener;
+
     /**
      * Call back object to call when clicking link
      */
@@ -153,6 +158,14 @@ public boolean callOnTap(MotionEvent event) {
         return onTapListener != null && onTapListener.onTap(event);
     }
 
+    public void setOnLongTap(OnLongTapListener onLongTapListener) {
+        this.onLongTapListener = onLongTapListener;
+    }
+
+    public boolean callOnLongTap(MotionEvent event) {
+        return onLongTapListener != null && onLongTapListener.onLongTap(event);
+    }
+
     public void setLinkHandler(LinkHandler linkHandler) {
         this.linkHandler = linkHandler;
     }

android-pdf-viewer/src/main/java/com/github/barteksc/pdfviewer/listener/OnLongTapListener.java

@@ -0,0 +1,33 @@
+/**
+ * Copyright 2017 Bartosz Schiller
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.github.barteksc.pdfviewer.listener;
+
+import android.view.MotionEvent;
+
+/**
+ * Implement this interface to receive events from PDFView
+ * when view has been touched
+ */
+public interface OnLongTapListener {
+
+    /**
+     * Called when the user has a long tap gesture, before processing scroll handle toggling
+     *
+     * @param e MotionEvent that registered as a confirmed long tap
+     * @return true if the long tap was handled, false to toggle scroll handle
+     */
+    boolean onLongTap(MotionEvent e);
+}