add support for double-tap to go back a transition

by replacing the onClickListener with an onTouchListener with the simple
variant of the GestureDetector.

Also drop the check that prevents going to the "end-of-presentation,
click to exit" slide and exiting the presentation that way.

Change-Id: I54b49bf11929ad9415b8c85581fe16998ab3a7a7
Reviewed-on: https://gerrit.libreoffice.org/7107
Reviewed-by: Andrzej Hunt <andrzej.hunt@collabora.com>
Tested-by: Andrzej Hunt <andrzej.hunt@collabora.com>

2 files changed, 37 insertions, 25 deletions

diff --git a/android/sdremote/src/org/libreoffice/impressremote/adapter/SlidesPagerAdapter.java b/android/sdremote/src/org/libreoffice/impressremote/adapter/SlidesPagerAdapter.java
index 94304fbfe784..da7826414262 100644
--- a/android/sdremote/src/org/libreoffice/impressremote/adapter/SlidesPagerAdapter.java
+++ b/android/sdremote/src/org/libreoffice/impressremote/adapter/SlidesPagerAdapter.java
@@ -25,15 +25,15 @@ public class SlidesPagerAdapter extends PagerAdapter {
 
     private final SlideShow mSlideShow;
 
-    private final View.OnClickListener mSlideClickListener;
+    private final View.OnTouchListener mSlideTouchListener;
 
-    public SlidesPagerAdapter(Context aContext, SlideShow aSlideShow, View.OnClickListener aSlideClickListener) {
+    public SlidesPagerAdapter(Context aContext, SlideShow aSlideShow, View.OnTouchListener aSlideTouchListener) {
         mLayoutInflater = LayoutInflater.from(aContext);
         mImageLoader = new ImageLoader(aContext.getResources(), R.drawable.bg_slide_unknown);
 
         mSlideShow = aSlideShow;
 
-        mSlideClickListener = aSlideClickListener;
+        mSlideTouchListener = aSlideTouchListener;
     }
 
     @Override
@@ -52,9 +52,8 @@ public class SlidesPagerAdapter extends PagerAdapter {
             setUpUnknownSlidePreview(aSlideView);
         }
 
-        // ViewPager itself cannot handle click events,
-        // so we need to use hacks. Android is good.
-        aSlideView.setOnClickListener(mSlideClickListener);
+        // touch listener that handles tap and double-tap
+        aSlideView.setOnTouchListener(mSlideTouchListener);
 
         aViewGroup.addView(aSlideView);
 
diff --git a/android/sdremote/src/org/libreoffice/impressremote/fragment/SlidesPagerFragment.java b/android/sdremote/src/org/libreoffice/impressremote/fragment/SlidesPagerFragment.java
index 3d13a116357b..002484a6ee79 100644
--- a/android/sdremote/src/org/libreoffice/impressremote/fragment/SlidesPagerFragment.java
+++ b/android/sdremote/src/org/libreoffice/impressremote/fragment/SlidesPagerFragment.java
@@ -18,11 +18,14 @@ import android.os.Bundle;
 import android.os.IBinder;
 import android.support.v4.app.Fragment;
 import android.support.v4.content.LocalBroadcastManager;
+import android.support.v4.view.GestureDetectorCompat;
 import android.support.v4.view.PagerAdapter;
 import android.support.v4.view.ViewPager;
 import android.text.Html;
 import android.text.TextUtils;
+import android.view.GestureDetector;
 import android.view.LayoutInflater;
+import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ScrollView;
@@ -34,9 +37,10 @@ import org.libreoffice.impressremote.R;
 import org.libreoffice.impressremote.adapter.SlidesPagerAdapter;
 import org.libreoffice.impressremote.communication.CommunicationService;
 
-public class SlidesPagerFragment extends Fragment implements ServiceConnection, ViewPager.OnPageChangeListener, View.OnClickListener {
+public class SlidesPagerFragment extends Fragment implements ServiceConnection, ViewPager.OnPageChangeListener, View.OnTouchListener {
     private CommunicationService mCommunicationService;
     private BroadcastReceiver mIntentsReceiver;
+    private GestureDetectorCompat mDetector;
 
     public static SlidesPagerFragment newInstance() {
         return new SlidesPagerFragment();
@@ -44,6 +48,7 @@ public class SlidesPagerFragment extends Fragment implements ServiceConnection,
 
     @Override
     public View onCreateView(LayoutInflater aInflater, ViewGroup aContainer, Bundle aSavedInstanceState) {
+        mDetector = new GestureDetectorCompat(aContainer.getContext(), new MyGestureListener());
         return aInflater.inflate(R.layout.fragment_slides_pager, aContainer, false);
     }
 
@@ -96,24 +101,6 @@ public class SlidesPagerFragment extends Fragment implements ServiceConnection,
         return new SlidesPagerAdapter(getActivity(), aSlideShow, this);
     }
 
-    @Override
-    public void onClick(View aView) {
-        if (!isLastSlideDisplayed()) {
-            showNextTransition();
-        }
-    }
-
-    private boolean isLastSlideDisplayed() {
-        int aCurrentSlideIndex = mCommunicationService.getSlideShow().getHumanCurrentSlideIndex();
-        int aSlidesCount = mCommunicationService.getSlideShow().getSlidesCount();
-
-        return aCurrentSlideIndex == aSlidesCount;
-    }
-
-    private void showNextTransition() {
-        mCommunicationService.getCommandsTransmitter().performNextTransition();
-    }
-
     private int getSlidesMargin() {
         return getResources().getDimensionPixelSize(R.dimen.margin_slide);
     }
@@ -346,6 +333,32 @@ public class SlidesPagerFragment extends Fragment implements ServiceConnection,
     private boolean isServiceBound() {
         return mCommunicationService != null;
     }
+
+    @Override
+    public boolean onTouch(View v, MotionEvent event) {
+        return mDetector.onTouchEvent(event);
+    }
+
+    class MyGestureListener extends GestureDetector.SimpleOnGestureListener {
+        @Override
+        public boolean onDown(MotionEvent event) {
+            // down is the start for everything, we want that..
+            return true;
+        }
+
+        @Override
+        public boolean onSingleTapConfirmed(MotionEvent event) {
+            mCommunicationService.getCommandsTransmitter().performNextTransition();
+            return true;
+        }
+
+        @Override
+        public boolean onDoubleTap(MotionEvent event) {
+            mCommunicationService.getCommandsTransmitter().performPreviousTransition();
+            return true;
+        }
+    }
+
 }
 
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