From f3aa3e42bdce3baa3f55adb65cd3dbb1bc8e2a6e Mon Sep 17 00:00:00 2001
From: Douglas Nassif Roma Junior <douglas.junior@db1.com.br>
Date: Thu, 9 Mar 2023 17:51:28 -0300
Subject: [PATCH] Add Android double tap zoom

---
 README.md                                     | 22 ++++---
 Sample/App.tsx                                |  2 +-
 Sample/ios/Podfile.lock                       |  2 +-
 .../modules/PdfRendererRecyclerView.java      | 61 +++++++++++++------
 .../modules/PdfRendererViewManager.java       |  2 -
 package.json                                  |  4 +-
 src/PdfRendererView.tsx                       | 19 +++++-
 7 files changed, 74 insertions(+), 38 deletions(-)

diff --git a/README.md b/README.md
index 16c1e2f..8307b82 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 [![npm version](https://img.shields.io/npm/v/react-native-pdf-renderer.svg)](https://www.npmjs.com/package/react-native-pdf-renderer)
 [![npm downloads](https://img.shields.io/npm/dt/react-native-pdf-renderer.svg)](#install-with-react-native-link)
 
-⚛ A blazing fast, zero dependencies, pure native PDF Renderer for Android and iOS.
+⚛ A blazing fast, zero dependencies, pure native, typed PDF Renderer for Android and iOS.
 
 |Android|iOS|
 |-|-|
@@ -38,15 +38,17 @@ import PdfRendererView from 'react-native-pdf-renderer';
 
 const App = () => {
    return (
-      <PdfRendererView
-         style={{flex: 1}}
-         source="file:///path/to/local/file.pdf"
-         distanceBetweenPages={16}
-         maxZoom={5}
-         onPageChange={(current, total) => {
-            console.log(current, total);
-         }}
-      />
+      <SafeAreaView style={{flex: 1}}>
+         <PdfRendererView
+            style={{backgroundColor: 'red'}}
+            source="file:///path/to/local/file.pdf"
+            distanceBetweenPages={16}
+            maxZoom={5}
+            onPageChange={(current, total) => {
+               console.log(current, total);
+            }}
+         />
+      </SafeAreaView>
    );
 }
 
diff --git a/Sample/App.tsx b/Sample/App.tsx
index 92e04a3..f5917b9 100644
--- a/Sample/App.tsx
+++ b/Sample/App.tsx
@@ -48,7 +48,7 @@ function App(): JSX.Element {
     return (
       <>
         <PdfRendererView
-          style={{flex: 1, backgroundColor: 'gray'}}
+          style={{backgroundColor: 'red'}}
           source={source}
           distanceBetweenPages={16}
           maxZoom={2}
diff --git a/Sample/ios/Podfile.lock b/Sample/ios/Podfile.lock
index cee78ec..ad035fe 100644
--- a/Sample/ios/Podfile.lock
+++ b/Sample/ios/Podfile.lock
@@ -663,7 +663,7 @@ SPEC CHECKSUMS:
   React-RCTVibration: ad17efcfb2fa8f6bfd8ac0cf48d96668b8b28e0b
   React-runtimeexecutor: 8fa50b38df6b992c76537993a2b0553d3b088004
   ReactCommon: b49a4b00ca6d181ff74b17c12b2d59ac4add0bde
-  ReactNativePdfRenderer: e16e7bad8100055c7787f468ae5c5b1f6cd1b570
+  ReactNativePdfRenderer: 1b38752eff13afed18c5a0c545cb1ec03df058b9
   SocketRocket: fccef3f9c5cedea1353a9ef6ada904fde10d6608
   Yoga: 79dd7410de6f8ad73a77c868d3d368843f0c93e0
   YogaKit: f782866e155069a2cca2517aafea43200b01fd5a
diff --git a/android/src/main/java/com/github/douglasjunior/reactNativePdfRenderer/modules/PdfRendererRecyclerView.java b/android/src/main/java/com/github/douglasjunior/reactNativePdfRenderer/modules/PdfRendererRecyclerView.java
index 4bdf9ac..8ffabb1 100644
--- a/android/src/main/java/com/github/douglasjunior/reactNativePdfRenderer/modules/PdfRendererRecyclerView.java
+++ b/android/src/main/java/com/github/douglasjunior/reactNativePdfRenderer/modules/PdfRendererRecyclerView.java
@@ -30,7 +30,6 @@
 import android.graphics.Matrix;
 import android.graphics.pdf.PdfRenderer;
 import android.os.ParcelFileDescriptor;
-import android.util.Log;
 import android.util.TypedValue;
 import android.view.GestureDetector;
 import android.view.MotionEvent;
@@ -50,12 +49,12 @@
 
 import java.io.File;
 import java.io.IOException;
-import java.util.Arrays;
 
 public class PdfRendererRecyclerView extends RecyclerView {
     private final ViewGroup mParent;
     private final GestureDetector mGestureDetector;
     private boolean mRequestedLayout = false;
+    private float mMinZoom = 1;
     private float mMaxZoom = 5;
     private float mDistanceBetweenPages = 0;
     private int mWidth;
@@ -150,7 +149,7 @@ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 
     @Override
     protected void onSizeChanged(int w, int h, int oldw, int oldh) {
-        super.onSizeChanged(w,h,oldw,oldh);
+        super.onSizeChanged(w, h, oldw, oldh);
         float scale = Math.max(w / mWidth, h / mHeight);
         mMatrix.setScale(scale, scale);
         mMatrix.postTranslate((w - scale * mWidth) / 2f, (h - scale * mHeight) / 2f);
@@ -161,9 +160,6 @@ protected void onSizeChanged(int w, int h, int oldw, int oldh) {
     public boolean onTouchEvent(MotionEvent e) {
         mScaleDetector.onTouchEvent(e);
         mGestureDetector.onTouchEvent(e);
-        if (mScaleDetector.isInProgress()) {
-            return true;
-        }
         return super.onTouchEvent(e);
     }
 
@@ -192,14 +188,11 @@ private void validateMatrixLimits() {
         float[] values = new float[9];
         mMatrix.getValues(values);
 
-        Log.d("mMatrix1", Arrays.toString(values) + "");
-        Log.d("size", mWidth + " | " + mHeight);
-
-        float scaleX = Math.min(Math.max(values[0], 1), mMaxZoom);
-        float posX = values[2];
+        float scaleX = Math.min(Math.max(values[Matrix.MSCALE_X], mMinZoom), mMaxZoom);
+        float posX = values[Matrix.MTRANS_X];
 
-        float scaleY = Math.min(Math.max(values[4], 1), mMaxZoom);
-        float posY = values[5];
+        float scaleY = Math.min(Math.max(values[Matrix.MSCALE_Y], mMinZoom), mMaxZoom);
+        float posY = values[Matrix.MTRANS_Y];
 
         float maxPosX = mWidth - mWidth * scaleX;
         float maxPosY = mHeight - mHeight * scaleY;
@@ -214,14 +207,12 @@ else if (posX < maxPosX)
         else if (posY < maxPosY)
             posY = maxPosY;
 
-        values[0] = scaleX;
-        values[2] = posX;
-        values[4] = scaleY;
-        values[5] = posY;
+        values[Matrix.MSCALE_X] = scaleX;
+        values[Matrix.MTRANS_X] = posX;
+        values[Matrix.MSCALE_Y] = scaleY;
+        values[Matrix.MTRANS_Y] = posY;
 
         mMatrix.setValues(values);
-
-        Log.d("mMatrix2", Arrays.toString(values) + "");
     }
 
     /**
@@ -243,7 +234,16 @@ public void requestLayout() {
     private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
         @Override
         public boolean onScale(ScaleGestureDetector detector) {
+            float[] values = new float[9];
+            mMatrix.getValues(values);
+
+            float zoom = values[Matrix.MSCALE_X];
             float factor = detector.getScaleFactor();
+
+            if (zoom >= mMaxZoom && factor > 1) {
+                return false;
+            }
+
             mMatrix.postScale(factor, factor, getWidth() / 2f, getHeight() / 2f);
             validateMatrixLimits();
             ViewCompat.postInvalidateOnAnimation(PdfRendererRecyclerView.this);
@@ -259,6 +259,29 @@ public boolean onScroll(MotionEvent e1, MotionEvent e2, float dX, float dY) {
             ViewCompat.postInvalidateOnAnimation(PdfRendererRecyclerView.this);
             return true;
         }
+
+        @Override
+        public boolean onDoubleTap(@NonNull MotionEvent e) {
+            if (e.getPointerCount() > 1) {
+                return false;
+            }
+
+            float[] values = new float[9];
+            mMatrix.getValues(values);
+
+            float currentZoom = values[Matrix.MSCALE_X];
+            float newZoom = currentZoom > mMinZoom ? mMinZoom : mMaxZoom;
+            float centerX = getWidth() / 2f;
+            float centerY = getHeight() / 2f;
+
+            mMatrix.setScale(newZoom, newZoom, centerX, centerY);
+            mMatrix.postTranslate(centerX - e.getX(), centerY - e.getY());
+
+            validateMatrixLimits();
+
+            ViewCompat.postInvalidateOnAnimation(PdfRendererRecyclerView.this);
+            return true;
+        }
     }
 
     class PdfRendererAdapter extends Adapter<PdfRendererAdapter.ViewHolder> {
diff --git a/android/src/main/java/com/github/douglasjunior/reactNativePdfRenderer/modules/PdfRendererViewManager.java b/android/src/main/java/com/github/douglasjunior/reactNativePdfRenderer/modules/PdfRendererViewManager.java
index 4ea3e40..1f339fe 100644
--- a/android/src/main/java/com/github/douglasjunior/reactNativePdfRenderer/modules/PdfRendererViewManager.java
+++ b/android/src/main/java/com/github/douglasjunior/reactNativePdfRenderer/modules/PdfRendererViewManager.java
@@ -22,7 +22,6 @@
 
 package com.github.douglasjunior.reactNativePdfRenderer.modules;
 
-import android.util.Log;
 import android.view.ViewGroup;
 import android.widget.LinearLayout;
 
@@ -83,7 +82,6 @@ public Map<String, Object> getExportedCustomBubblingEventTypeConstants() {
 
     @ReactProp(name = "source")
     public void setSource(ViewGroup layout, @Nullable String source) throws IOException {
-        Log.d("PdfRendererViewManager", "setSource");
         PdfRendererRecyclerView recyclerView = (PdfRendererRecyclerView) layout.getChildAt(0);
 
         if (source != null) {
diff --git a/package.json b/package.json
index 716fcf9..a7a873b 100644
--- a/package.json
+++ b/package.json
@@ -1,8 +1,8 @@
 {
   "name": "react-native-pdf-renderer",
   "displayName": "React-Native Pdf Renderer",
-  "version": "0.0.5",
-  "description": "⚛ A blazing fast, zero dependencies, pure native PDF Renderer for Android and iOS.",
+  "version": "1.0.0",
+  "description": "⚛ A blazing fast, zero dependencies, pure native, typed PDF Renderer for Android and iOS.",
   "main": "src",
   "license": "MIT",
   "private": false,
diff --git a/src/PdfRendererView.tsx b/src/PdfRendererView.tsx
index 6581858..d00b62d 100644
--- a/src/PdfRendererView.tsx
+++ b/src/PdfRendererView.tsx
@@ -20,10 +20,11 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
-import React, {useCallback} from 'react';
+import React, {useCallback, useMemo} from 'react';
 import {
   NativeSyntheticEvent,
   requireNativeComponent,
+  StyleSheet,
   ViewProps,
 } from 'react-native';
 
@@ -41,8 +42,20 @@ type OnPageChangeEventType = {
 
 const PdfRendererNative = requireNativeComponent('RNPdfRendererView') as any;
 
+const styles = StyleSheet.create({
+  default: {
+    backgroundColor: 'gray',
+    flex: 1,
+  }
+});
+
 const PdfRendererView = (props: PdfRendererViewPropsType): JSX.Element => {
-  const {onPageChange, ...others} = props;
+  const {onPageChange, style, ...others} = props;
+
+  const viewStyles = useMemo(() => [
+    styles.default,
+    style,
+  ], [style]);
 
   const handlePageChange = useCallback(
     (event: NativeSyntheticEvent<OnPageChangeEventType>) => {
@@ -51,7 +64,7 @@ const PdfRendererView = (props: PdfRendererViewPropsType): JSX.Element => {
     [onPageChange],
   );
 
-  return <PdfRendererNative {...others} onPageChange={handlePageChange} />;
+  return <PdfRendererNative {...others} style={viewStyles} onPageChange={handlePageChange} />;
 };
 
 PdfRendererView.defaultProps = {