Merge branch 'alierdogan7-master'

Author: barteksc

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

@@ -19,6 +19,8 @@
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Color;
+import android.graphics.ColorMatrix;
+import android.graphics.ColorMatrixColorFilter;
 import android.graphics.Paint;
 import android.graphics.Paint.Style;
 import android.graphics.PaintFlagsDrawFilter;
@@ -40,12 +42,12 @@
 import com.github.barteksc.pdfviewer.listener.OnDrawListener;
 import com.github.barteksc.pdfviewer.listener.OnErrorListener;
 import com.github.barteksc.pdfviewer.listener.OnLoadCompleteListener;
+import com.github.barteksc.pdfviewer.listener.OnLongPressListener;
 import com.github.barteksc.pdfviewer.listener.OnPageChangeListener;
 import com.github.barteksc.pdfviewer.listener.OnPageErrorListener;
 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.OnLongPressListener;
 import com.github.barteksc.pdfviewer.model.PagePart;
 import com.github.barteksc.pdfviewer.scroll.ScrollHandle;
 import com.github.barteksc.pdfviewer.source.AssetSource;
@@ -178,6 +180,8 @@ enum ScrollDir {
 
     private boolean doubletapEnabled = true;
 
+    private boolean nightMode = false;
+
     private boolean pageSnap = true;
 
     /** Pdfium core for loading and rendering PDFs */
@@ -373,6 +377,23 @@ public void setSwipeEnabled(boolean enableSwipe) {
         this.enableSwipe = enableSwipe;
     }
 
+    public void setNightMode(boolean nightMode) {
+        this.nightMode = nightMode;
+        if (nightMode) {
+            ColorMatrix colorMatrixInverted =
+                    new ColorMatrix(new float[]{
+                            -1, 0, 0, 0, 255,
+                            0, -1, 0, 0, 255,
+                            0, 0, -1, 0, 255,
+                            0, 0, 0, 1, 0});
+
+            ColorMatrixColorFilter filter = new ColorMatrixColorFilter(colorMatrixInverted);
+            paint.setColorFilter(filter);
+        } else {
+            paint.setColorFilter(null);
+        }
+    }
+
     void enableDoubletap(boolean enableDoubletap) {
         this.doubletapEnabled = enableDoubletap;
     }
@@ -549,7 +570,7 @@ protected void onDraw(Canvas canvas) {
 
         Drawable bg = getBackground();
         if (bg == null) {
-            canvas.drawColor(Color.WHITE);
+            canvas.drawColor(nightMode ? Color.BLACK : Color.WHITE);
         } else {
             bg.draw(canvas);
         }
@@ -1313,6 +1334,8 @@ public class Configurator {
 
         private boolean pageSnap = false;
 
+        private boolean nightMode = false;
+
         private Configurator(DocumentSource documentSource) {
             this.documentSource = documentSource;
         }
@@ -1442,6 +1465,11 @@ public Configurator pageFling(boolean pageFling) {
             return this;
         }
 
+        public Configurator nightMode(boolean nightMode) {
+            this.nightMode = nightMode;
+            return this;
+        }
+
         public void load() {
             if (!hasSize) {
                 waitingDocumentConfigurator = this;
@@ -1460,6 +1488,7 @@ public void load() {
             PDFView.this.callbacks.setOnPageError(onPageErrorListener);
             PDFView.this.callbacks.setLinkHandler(linkHandler);
             PDFView.this.setSwipeEnabled(enableSwipe);
+            PDFView.this.setNightMode(nightMode);
             PDFView.this.enableDoubletap(enableDoubletap);
             PDFView.this.setDefaultPage(defaultPage);
             PDFView.this.setSwipeVertical(!swipeHorizontal);