add swipe support for presentation

Change-Id: I650d661a1656388e50e5d4e3a003b8eb4f032382

android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitTileProvider.java

@@ -10,12 +10,14 @@ import org.libreoffice.kit.DirectBufferAllocator;
 import org.libreoffice.kit.Document;
 import org.libreoffice.kit.LibreOfficeKit;
 import org.libreoffice.kit.Office;
+
 import org.mozilla.gecko.TextSelection;
 import org.mozilla.gecko.TextSelectionHandle;
 import org.mozilla.gecko.gfx.BufferedCairoImage;
 import org.mozilla.gecko.gfx.CairoImage;
 import org.mozilla.gecko.gfx.GeckoLayerClient;
 import org.mozilla.gecko.gfx.IntSize;
+import org.mozilla.gecko.gfx.LayerView;
 
 import java.nio.ByteBuffer;
 
@@ -92,6 +94,30 @@ public class LOKitTileProvider implements TileProvider, Document.MessageCallback
 
         // Writer documents always have one part, so hide the navigation drawer.
         if (mDocument.getDocumentType() != Document.DOCTYPE_TEXT) {
+
+            // Set left/right swipe listener for presentation only.
+            if (mDocument.getDocumentType() == Document.DOCTYPE_PRESENTATION) {
+                LayerView layerView = mLayerClient.getView();
+                layerView.setOnTouchListener(new OnSlideSwipeListener(LibreOfficeMainActivity.mAppContext) {
+                    @Override
+                    public void onSwipeRight() {
+                        if (getCurrentPartNumber() < mDocument.getParts()-1) {
+                            LOKitShell.sendChangePartEvent(getCurrentPartNumber()+1);
+                        }
+                    }
+
+                @Override
+                public void onSwipeLeft() {
+                    if (getCurrentPartNumber() > 0) {
+                        LOKitShell.sendChangePartEvent(getCurrentPartNumber()-1);
+                    }
+                }
+                });
+            } else {
+                // Unregister touch listener when loading another document.
+                mLayerClient.getView().setOnTouchListener(null);
+            }
+
             for (int i = 0; i < parts; i++) {
                 String partName = mDocument.getPartName(i);
                 if (partName.isEmpty()) {

android/experimental/LOAndroid3/src/java/org/libreoffice/OnSlideSwipeListener.java

+package org.libreoffice;
+
+import android.content.Context;
+import android.view.GestureDetector;
+import android.view.GestureDetector.SimpleOnGestureListener;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.View.OnTouchListener;
+
+public class OnSlideSwipeListener implements OnTouchListener {
+
+    private final GestureDetector mGestureDetector;
+
+    public OnSlideSwipeListener(Context ctx){
+        mGestureDetector = new GestureDetector(ctx, new GestureListener());
+    }
+
+    private final class GestureListener extends SimpleOnGestureListener {
+
+        private static final int SWIPE_THRESHOLD = 100;
+        private static final int SWIPE_VELOCITY_THRESHOLD = 100;
+
+        @Override
+        public boolean onDown(MotionEvent e) {
+            return true;
+        }
+
+        @Override
+        public boolean onFling(MotionEvent e1, MotionEvent e2, float velX, float velY) {
+            boolean result = false;
+            try {
+                float diffY = e2.getY() - e1.getY();
+                float diffX = e2.getX() - e1.getX();
+                if (Math.abs(diffX) > Math.abs(diffY)) {
+                    if (Math.abs(diffX) > SWIPE_THRESHOLD
+                            && Math.abs(velX) > SWIPE_VELOCITY_THRESHOLD) {
+                        if (diffX > 0) {
+                            onSwipeRight();
+                        } else {
+                            onSwipeLeft();
+                        }
+                            }
+                    result = true;
+                }
+            } catch (Exception exception) {
+                exception.printStackTrace();
+            }
+            return result;
+        }
+    }
+
+    public void onSwipeRight() {
+    }
+
+    public void onSwipeLeft() {
+    }
+
+    @Override
+    public boolean onTouch(View v, MotionEvent me) {
+        return mGestureDetector.onTouchEvent(me);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */