Volume keys scroll pages. Closes #95

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.java

@@ -10,6 +10,7 @@ import android.support.annotation.NonNull;
 import android.support.v4.app.FragmentManager;
 import android.support.v4.content.ContextCompat;
 import android.support.v7.widget.Toolbar;
+import android.view.KeyEvent;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.Surface;
@@ -153,6 +154,24 @@ public class ReaderActivity extends BaseRxActivity<ReaderPresenter> {
         }
     }
 
+    @Override
+    public boolean dispatchKeyEvent(KeyEvent event) {
+        int action = event.getAction();
+        int keyCode = event.getKeyCode();
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_VOLUME_DOWN:
+                if (action == KeyEvent.ACTION_UP && viewer != null)
+                    viewer.moveToNext();
+                return true;
+            case KeyEvent.KEYCODE_VOLUME_UP:
+                if (action == KeyEvent.ACTION_UP && viewer != null)
+                    viewer.moveToPrevious();
+                return true;
+            default:
+                return super.dispatchKeyEvent(event);
+        }
+    }
+
     public void onChapterError() {
         finish();
         ToastUtil.showShort(this, R.string.page_list_error);

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/base/BaseReader.java

@@ -93,6 +93,8 @@ public abstract class BaseReader extends BaseFragment {
     public abstract void setSelectedPage(int pageNumber);
     public abstract void onSetChapter(Chapter chapter, Page currentPage);
     public abstract void onAppendChapter(Chapter chapter);
+    public abstract void moveToNext();
+    public abstract void moveToPrevious();
 
     public void setDecoderClass(int value) {
         switch (value) {

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerReader.java

@@ -148,14 +148,14 @@ public abstract class PagerReader extends BaseReader {
     }
 
     protected void onLeftSideTap() {
-        if (pager.getCurrentItem() != 0) {
-            pager.setCurrentItem(pager.getCurrentItem() - 1, transitions);
-        } else {
-            getReaderActivity().requestPreviousChapter();
-        }
+        moveToPrevious();
     }
 
     protected void onRightSideTap() {
+        moveToNext();
+    }
+
+    public void moveToNext() {
         if (pager.getCurrentItem() != pager.getAdapter().getCount() - 1) {
             pager.setCurrentItem(pager.getCurrentItem() + 1, transitions);
         } else {
@@ -163,6 +163,14 @@ public abstract class PagerReader extends BaseReader {
         }
     }
 
+    public void moveToPrevious() {
+        if (pager.getCurrentItem() != 0) {
+            pager.setCurrentItem(pager.getCurrentItem() - 1, transitions);
+        } else {
+            getReaderActivity().requestPreviousChapter();
+        }
+    }
+
     private void setImageScaleType(int scaleType) {
         this.scaleType = scaleType;
     }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/horizontal/RightToLeftReader.java

@@ -19,12 +19,12 @@ public class RightToLeftReader extends PagerReader {
 
     @Override
     protected void onLeftSideTap() {
-        super.onRightSideTap();
+        moveToNext();
     }
 
     @Override
     protected void onRightSideTap() {
-        super.onLeftSideTap();
+        moveToPrevious();
     }
 
 }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonReader.java

@@ -69,9 +69,9 @@ public class WebtoonReader extends BaseReader {
                 final float positionX = e.getX();
 
                 if (positionX < recycler.getWidth() * LEFT_REGION) {
-                    recycler.smoothScrollBy(0, -scrollDistance);
+                    moveToPrevious();
                 } else if (positionX > recycler.getWidth() * RIGHT_REGION) {
-                    recycler.smoothScrollBy(0, scrollDistance);
+                    moveToNext();
                 } else {
                     getReaderActivity().onCenterSingleTap();
                 }
@@ -113,6 +113,16 @@ public class WebtoonReader extends BaseReader {
         recycler.scrollToPosition(pageNumber);
     }
 
+    @Override
+    public void moveToNext() {
+        recycler.smoothScrollBy(0, scrollDistance);
+    }
+
+    @Override
+    public void moveToPrevious() {
+        recycler.smoothScrollBy(0, -scrollDistance);
+    }
+
     @Override
     public void onSetChapter(Chapter chapter, Page currentPage) {
         pages = new ArrayList<>(chapter.getPages());
@@ -134,6 +144,9 @@ public class WebtoonReader extends BaseReader {
         if (recycler != null) {
             adapter.setPages(pages);
             adapter.notifyItemRangeInserted(insertStart, chapter.getPages().size());
+            if (subscription != null && subscription.isUnsubscribed()) {
+                observeStatus(insertStart);
+            }
         }
     }
 
@@ -162,8 +175,10 @@ public class WebtoonReader extends BaseReader {
     }
 
     private void observeStatus(int position) {
-        if (position == pages.size())
+        if (position == pages.size()) {
+            unsubscribeStatus();
             return;
+        }
 
         final Page page = pages.get(position);