Add a basic slides grid UI.

The slides adapter is using the ViewHolder pattern and view recycling to
improve performance.

Change-Id: I8f922799dc3af73e9ecaec92ca91eb38e8a784c0

android/sdremote/res/drawable/background_grid_slide.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <solid
+        android:color="@android:color/transparent" />
+
+    <stroke
+        android:width="1dp"
+        android:color="@color/stroke_slide"/>
+
+    <padding
+        android:left="1dp"
+        android:top="1dp"
+        android:right="1dp"
+        android:bottom="1.5dp"/>
+
+</shape>
\ No newline at end of file

android/sdremote/res/layout/fragment_slides_grid.xml

+<?xml version="1.0" encoding="utf-8"?>
+<GridView xmlns:android="http://schemas.android.com/apk/res/android"
+          android:id="@+id/grid_slides"
+          android:columnWidth="@dimen/width_slides_grid_column"
+          android:horizontalSpacing="@dimen/spacing_slides_grid"
+          android:verticalSpacing="@dimen/spacing_slides_grid"
+          android:numColumns="auto_fit"
+          android:stretchMode="columnWidth"
+          android:scrollbarStyle="outsideOverlay"
+          android:gravity="center"
+          android:padding="@dimen/padding_slides_grid"
+          android:clipToPadding="false"
+          android:layout_width="match_parent"
+          android:layout_height="match_parent"/>
\ No newline at end of file

android/sdremote/res/layout/view_grid_slide.xml

+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                android:padding="@dimen/padding_slide"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent">
+
+    <ImageView
+        android:id="@+id/image_slide_preview"
+        android:scaleType="centerCrop"
+        android:adjustViewBounds="true"
+        android:background="@drawable/background_grid_slide"
+        android:layout_alignParentTop="true"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"/>
+
+    <TextView
+        android:id="@+id/text_slide_index"
+        android:background="@color/background_slide_index"
+        android:textColor="@android:color/white"
+        android:singleLine="true"
+        android:layout_alignParentBottom="true"
+        android:layout_width="wrap_content"
+        android:minEms="2"
+        android:gravity="center_horizontal"
+        android:layout_height="wrap_content"/>
+
+</RelativeLayout>
\ No newline at end of file

android/sdremote/res/values/colors.xml

@@ -2,8 +2,10 @@
 <resources>
 
     <color name="background_action_bar">#e46f1f</color>
-
     <color name="background_action_bar_divider">#55ffffff</color>
+    <color name="background_slide_index">#7f000000</color>
+
+    <color name="stroke_slide">#65000000</color>
 
     <color name="orange">#EE4400</color>
     <color name="grey">#303030</color>

android/sdremote/res/values/dimens.xml

@@ -3,6 +3,8 @@
 
     <dimen name="padding_action_bar_button_drawable">8dp</dimen>
     <dimen name="padding_creation_layout">16dp</dimen>
+    <dimen name="padding_slides_grid">4dp</dimen>
+    <dimen name="padding_slide">4dp</dimen>
 
     <dimen name="padding_horizontal_list_item">8dp</dimen>
     <dimen name="padding_horizontal_connection_layout">40dp</dimen>
@@ -16,9 +18,12 @@
     <dimen name="margin_vertical_action_bar_divider">12dp</dimen>
 
     <dimen name="width_action_bar_divider">0.5dp</dimen>
+    <dimen name="width_slides_grid_column">90dp</dimen>
 
     <dimen name="text_size_list_item">18sp</dimen>
     <dimen name="text_size_pin">35sp</dimen>
     <dimen name="text_size_error_title">20sp</dimen>
 
+    <dimen name="spacing_slides_grid">4dp</dimen>
+
 </resources>
\ No newline at end of file

android/sdremote/src/org/libreoffice/impressremote/SlidesGridAdapter.java

+/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+package org.libreoffice.impressremote;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.BaseAdapter;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import org.libreoffice.impressremote.communication.SlideShow;
+
+public class SlidesGridAdapter extends BaseAdapter {
+    private final LayoutInflater mLayoutInflater;
+
+    private final SlideShow mSlideShow;
+
+    public SlidesGridAdapter(Context aContext, SlideShow aSlideShow) {
+        mLayoutInflater = buildLayoutInflater(aContext);
+
+        mSlideShow = aSlideShow;
+    }
+
+    private LayoutInflater buildLayoutInflater(Context aContext) {
+        return (LayoutInflater) aContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+    }
+
+    @Override
+    public int getCount() {
+        return mSlideShow.getSlidesCount();
+    }
+
+    @Override
+    public Object getItem(int aPosition) {
+        return mSlideShow.getSlidePreview(aPosition);
+    }
+
+    @Override
+    public long getItemId(int aPosition) {
+        return aPosition;
+    }
+
+    @Override
+    public View getView(int aPosition, View aConvertView, ViewGroup aViewGroup) {
+        View aSlideView = getView(aConvertView, aViewGroup);
+        ViewHolder aSlideViewHolder = getViewHolder(aSlideView);
+
+        if (isSlidePreviewAvailable(aPosition)) {
+            aSlideViewHolder.aSlidePreview.setImageBitmap(mSlideShow.getSlidePreview(aPosition));
+        } else {
+            aSlideViewHolder.aSlidePreview.setImageResource(R.drawable.slide_unknown);
+        }
+
+        aSlideViewHolder.aSlideIndex.setText(buildSlideIndex(aPosition));
+
+        return aSlideView;
+    }
+
+    private View getView(View aConvertView, ViewGroup aViewGroup) {
+        if (aConvertView != null) {
+            return aConvertView;
+        }
+
+        return mLayoutInflater.inflate(R.layout.view_grid_slide, aViewGroup, false);
+    }
+
+    private ViewHolder getViewHolder(View aView) {
+        if (aView.getTag() != null) {
+            return (ViewHolder) aView.getTag();
+        }
+
+        return buildViewHolder(aView);
+    }
+
+    private static final class ViewHolder {
+        public ImageView aSlidePreview;
+        public TextView aSlideIndex;
+    }
+
+    private ViewHolder buildViewHolder(View aView) {
+        ViewHolder aViewHolder = new ViewHolder();
+
+        aViewHolder.aSlidePreview = (ImageView) aView.findViewById(R.id.image_slide_preview);
+        aViewHolder.aSlideIndex = (TextView) aView.findViewById(R.id.text_slide_index);
+
+        return aViewHolder;
+    }
+
+    private boolean isSlidePreviewAvailable(int aSlideIndex) {
+        return mSlideShow.getSlidePreview(aSlideIndex) != null;
+    }
+
+    private String buildSlideIndex(int aPosition) {
+        int aHumanSlideIndex = aPosition + 1;
+
+        return Integer.toString(aHumanSlideIndex);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

android/sdremote/src/org/libreoffice/impressremote/SlidesGridFragment.java

+/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+package org.libreoffice.impressremote;
+
+import android.content.BroadcastReceiver;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.ServiceConnection;
+import android.os.Bundle;
+import android.os.IBinder;
+import android.support.v4.content.LocalBroadcastManager;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.AdapterView;
+import android.widget.GridView;
+
+import com.actionbarsherlock.app.SherlockFragment;
+import org.libreoffice.impressremote.communication.CommunicationService;
+
+public class SlidesGridFragment extends SherlockFragment implements ServiceConnection, AdapterView.OnItemClickListener {
+    private CommunicationService mCommunicationService;
+    private BroadcastReceiver mIntentsReceiver;
+
+    public static SlidesGridFragment newInstance() {
+        return new SlidesGridFragment();
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater aInflater, ViewGroup aContainer, Bundle aSavedInstanceState) {
+        return aInflater.inflate(R.layout.fragment_slides_grid, aContainer, false);
+    }
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+
+        bindService();
+    }
+
+    private void bindService() {
+        Intent aServiceIntent = new Intent(getActivity(), CommunicationService.class);
+
+        getActivity().bindService(aServiceIntent, this, Context.BIND_AUTO_CREATE);
+    }
+
+    @Override
+    public void onServiceConnected(ComponentName aComponentName, IBinder aBinder) {
+        CommunicationService.CBinder aServiceBinder = (CommunicationService.CBinder) aBinder;
+
+        mCommunicationService = aServiceBinder.getService();
+
+        mCommunicationService.getTransmitter().startPresentation();
+
+        setUpSlidesGrid();
+    }
+
+    private void setUpSlidesGrid() {
+        SlidesGridAdapter aSlidesGridAdapter = new SlidesGridAdapter(getActivity(),
+            mCommunicationService.getSlideShow());
+
+        getSlidesGrid().setAdapter(aSlidesGridAdapter);
+        getSlidesGrid().setOnItemClickListener(this);
+    }
+
+    private GridView getSlidesGrid() {
+        return (GridView) getView().findViewById(R.id.grid_slides);
+    }
+
+    @Override
+    public void onServiceDisconnected(ComponentName aComponentName) {
+        mCommunicationService = null;
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+
+        registerIntentsReceiver();
+    }
+
+    private void registerIntentsReceiver() {
+        mIntentsReceiver = new IntentsReceiver(this);
+        IntentFilter aIntentFilter = buildIntentsReceiverFilter();
+
+        getBroadcastManager().registerReceiver(mIntentsReceiver, aIntentFilter);
+    }
+
+    @Override
+    public void onItemClick(AdapterView<?> aAdapterView, View aView, int aPosition, long aId) {
+        mCommunicationService.getTransmitter().setCurrentSlide(aPosition);
+    }
+
+    private static final class IntentsReceiver extends BroadcastReceiver {
+        private final SlidesGridFragment mSlidesGridFragment;
+
+        private IntentsReceiver(SlidesGridFragment aSlidesGridFragment) {
+            mSlidesGridFragment = aSlidesGridFragment;
+        }
+
+        @Override
+        public void onReceive(Context aContext, Intent aIntent) {
+            if (Intents.Actions.SLIDE_PREVIEW.equals(aIntent.getAction())) {
+                mSlidesGridFragment.refreshSlidesGrid();
+            }
+        }
+    }
+
+    private IntentFilter buildIntentsReceiverFilter() {
+        IntentFilter aIntentFilter = new IntentFilter();
+        aIntentFilter.addAction(Intents.Actions.SLIDE_PREVIEW);
+
+        return aIntentFilter;
+    }
+
+    private LocalBroadcastManager getBroadcastManager() {
+        Context aContext = getActivity().getApplicationContext();
+
+        return LocalBroadcastManager.getInstance(aContext);
+    }
+
+    private void refreshSlidesGrid() {
+        getSlidesGrid().invalidateViews();
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+
+        unregisterIntentsReceiver();
+    }
+
+    private void unregisterIntentsReceiver() {
+        try {
+            getBroadcastManager().unregisterReceiver(mIntentsReceiver);
+        } catch (IllegalArgumentException e) {
+            // Receiver not registered.
+            // Fixed in Honeycomb: Android’s issue #6191.
+        }
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+
+        unbindService();
+    }
+
+    private void unbindService() {
+        if (!isServiceBound()) {
+            return;
+        }
+
+        getActivity().unbindService(this);
+    }
+
+    private boolean isServiceBound() {
+        return mCommunicationService != null;
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

android/sdremote/src/org/libreoffice/impressremote/communication/CommunicationService.java

@@ -58,6 +58,8 @@ public class CommunicationService extends Service implements Runnable, MessagesL
 
         mServersManager = new ServersManager(this);
 
+        mSlideShow = new SlideShow();
+
         mThread = new Thread(this);
         mThread.start();
     }
@@ -240,7 +242,7 @@ public class CommunicationService extends Service implements Runnable, MessagesL
 
     @Override
     public void onSlideShowStart(int aSlidesCount, int aCurrentSlideIndex) {
-        mSlideShow = new SlideShow();
+        mSlideShow.cleanUp();
         mSlideShow.setSlidesCount(aSlidesCount);
 
         Intent aIntent = Intents.buildSlideShowRunningIntent();
@@ -251,7 +253,7 @@ public class CommunicationService extends Service implements Runnable, MessagesL
 
     @Override
     public void onSlideShowFinish() {
-        mSlideShow = new SlideShow();
+        mSlideShow.cleanUp();
 
         Intent aIntent = Intents.buildSlideShowStoppedIntent();
         LocalBroadcastManager.getInstance(this).sendBroadcast(aIntent);

android/sdremote/src/org/libreoffice/impressremote/communication/SlideShow.java

@@ -33,7 +33,7 @@ public class SlideShow {
     }
 
     public void setSlidesCount(int aSlidesCount) {
-        this.mSlidesCount = aSlidesCount;
+        mSlidesCount = aSlidesCount;
     }
 
     public int getSlidesCount() {
@@ -41,7 +41,7 @@ public class SlideShow {
     }
 
     public void setCurrentSlideIndex(int aCurrentSlideIndex) {
-        this.mCurrentSlideIndex = aCurrentSlideIndex;
+        mCurrentSlideIndex = aCurrentSlideIndex;
     }
 
     public int getCurrentSlideIndex() {
@@ -76,6 +76,14 @@ public class SlideShow {
     public Timer getTimer() {
         return mTimer;
     }
+
+    public void cleanUp() {
+        mSlidesCount = 0;
+        mCurrentSlideIndex = 0;
+
+        mSlidePreviews.clear();
+        mSlideNotes.clear();
+    }
 }
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */