0001-Added-support-for-image-thumbnails-basic-version.patch

From 419ea7856e2ade808006ec29cb97278d397461a7 Mon Sep 17 00:00:00 2001
From: Gregor Santner <gsantner@mailbox.org>
Date: Wed, 8 Jan 2020 19:51:46 +0100
Subject: [PATCH] Added support for image thumbnails (basic version)

Optimized imports

Moved ImageLoaderTask and changed FsViewerAdapter
---
 .../opoc/ui/FilesystemViewerAdapter.java      | 29 ++++++-
 .../gsantner/opoc/util/ImageLoaderTask.java   | 79 +++++++++++++++++++
 2 files changed, 104 insertions(+), 4 deletions(-)
 create mode 100644 app/src/main/java/net/gsantner/opoc/util/ImageLoaderTask.java

diff --git a/app/src/main/java/net/gsantner/opoc/ui/FilesystemViewerAdapter.java b/app/src/main/java/net/gsantner/opoc/ui/FilesystemViewerAdapter.java
index 4dc5b5fd..6e8dd27e 100644
--- a/app/src/main/java/net/gsantner/opoc/ui/FilesystemViewerAdapter.java
+++ b/app/src/main/java/net/gsantner/opoc/ui/FilesystemViewerAdapter.java
@@ -11,6 +11,7 @@
 package net.gsantner.opoc.ui;
 
 import android.content.Context;
+import android.graphics.Bitmap;
 import android.os.Bundle;
 import android.os.Handler;
 import android.support.annotation.NonNull;
@@ -31,6 +32,7 @@ import android.widget.TextView;
 import android.widget.Toast;
 
 import net.gsantner.markor.R;
+import net.gsantner.opoc.util.ImageLoaderTask;
 
 import java.io.File;
 import java.io.FilenameFilter;
@@ -47,7 +49,7 @@ import butterknife.BindView;
 import butterknife.ButterKnife;
 
 @SuppressWarnings({"WeakerAccess", "unused"})
-public class FilesystemViewerAdapter extends RecyclerView.Adapter<FilesystemViewerAdapter.ilesystemViewerViewHolder> implements Filterable, View.OnClickListener, View.OnLongClickListener, Comparator<File>, FilenameFilter {
+public class FilesystemViewerAdapter extends RecyclerView.Adapter<FilesystemViewerAdapter.ilesystemViewerViewHolder> implements Filterable, View.OnClickListener, View.OnLongClickListener, Comparator<File>, FilenameFilter, ImageLoaderTask.OnImageLoadedListener<FilesystemViewerAdapter.ilesystemViewerViewHolder> {
     //########################
     //## Static
     //########################
@@ -143,12 +145,23 @@ public class FilesystemViewerAdapter extends RecyclerView.Adapter<FilesystemView
         holder.description.setTextColor(ContextCompat.getColor(_context, _dopt.secondaryTextColor));
 
         holder.image.setImageResource(file.isDirectory() ? _dopt.folderImage : _dopt.fileImage);
+
+        final boolean isImage = ((filename.toLowerCase().endsWith(".jpg")) || (filename.toLowerCase().endsWith(".png")));
+
+        if (isImage) {
+            ImageLoaderTask<ilesystemViewerViewHolder> taskLoadImage = new ImageLoaderTask<>(this, _context, true, holder);
+            taskLoadImage.execute(file);
+        }
+
         if (_currentSelection.contains(file)) {
             holder.image.setImageResource(_dopt.selectedItemImage);
         }
-        holder.image.setColorFilter(ContextCompat.getColor(_context,
-                _currentSelection.contains(file) ? _dopt.accentColor : _dopt.secondaryTextColor),
-                android.graphics.PorterDuff.Mode.SRC_ATOP);
+
+        if (!isImage) {
+            holder.image.setColorFilter(ContextCompat.getColor(_context,
+                    _currentSelection.contains(file) ? _dopt.accentColor : _dopt.secondaryTextColor),
+                    android.graphics.PorterDuff.Mode.SRC_ATOP);
+        }
 
         if (_dopt.itemSidePadding > 0) {
             int dp = (int) (_dopt.itemSidePadding * _context.getResources().getDisplayMetrics().density);
@@ -239,6 +252,14 @@ public class FilesystemViewerAdapter extends RecyclerView.Adapter<FilesystemView
         );
     }
 
+    @Override
+    public void onImageLoaded(Bitmap bitmap, ilesystemViewerViewHolder holder) {
+        try {
+            holder.image.setImageBitmap(bitmap);
+        } catch(Exception ignored) {
+        }
+    }
+
     public class TagContainer {
         public final File file;
         public final int position;
diff --git a/app/src/main/java/net/gsantner/opoc/util/ImageLoaderTask.java b/app/src/main/java/net/gsantner/opoc/util/ImageLoaderTask.java
new file mode 100644
index 00000000..4007595c
--- /dev/null
+++ b/app/src/main/java/net/gsantner/opoc/util/ImageLoaderTask.java
@@ -0,0 +1,79 @@
+/*#######################################################
+ *
 *   Maintained 2017-2025 by Gregor Santner <gsantner AT mailbox DOT org>
+ *
+ *   License of this file: Apache 2.0
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *     https://github.com/gsantner/opoc/#licensing
+ *
+#########################################################*/
+package net.gsantner.opoc.util;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.os.AsyncTask;
+import android.support.v4.content.ContextCompat;
+
+import net.gsantner.markor.R;
+import net.gsantner.markor.util.AppSettings;
+import net.gsantner.markor.util.ContextUtils;
+
+import java.io.File;
+
+
+public class ImageLoaderTask<T> extends AsyncTask<File, Void, Bitmap> {
+    private final static int MAX_DIMENSION = 5000;
+    private final static int MAX_SIZE = 64;
+
+    public interface OnImageLoadedListener<T> {
+        void onImageLoaded(Bitmap bitmap, T callbackParam);
+    }
+
+    private final Context _context;
+    private final OnImageLoadedListener _listener;
+    private final T _callbackParam;
+    private final boolean _loadThumbnail;
+
+    public ImageLoaderTask(OnImageLoadedListener listener, Context context, boolean loadThumbnail, T callbackParam) {
+        _listener = listener;
+        _context = context;
+        _callbackParam = callbackParam;
+        _loadThumbnail = loadThumbnail;
+    }
+
+    private Bitmap loadStorageImage(File pathToImage) {
+        File cacheFile = new File(_context.getCacheDir(), pathToImage.getAbsolutePath().substring(1));
+        ContextUtils cu = ContextUtils.get();
+        Bitmap bitmap;
+        try {
+            if (_loadThumbnail) {
+                if (cacheFile.exists()) {
+                    bitmap = cu.loadImageFromFilesystem(cacheFile, MAX_SIZE);
+                } else {
+                    bitmap = cu.loadImageFromFilesystem(pathToImage, MAX_SIZE);
+                    cu.writeImageToFile(cacheFile, bitmap, Bitmap.CompressFormat.JPEG, 65);
+                }
+            } else {
+                bitmap = cu.loadImageFromFilesystem(pathToImage, MAX_SIZE);
+            }
+        } catch (NullPointerException nul) {
+            int expImage = AppSettings.get().isDarkThemeEnabled() ? R.drawable.ic_file_white_24dp : R.drawable.ic_file_gray_24dp;
+            bitmap = cu.drawableToBitmap(ContextCompat.getDrawable(_context, expImage));
+        }
+
+        return bitmap;
+    }
+
+    @Override
+    protected Bitmap doInBackground(File... params) {
+        return loadStorageImage(params[0]);
+    }
+
+    @Override
+    protected void onPostExecute(Bitmap bitmap) {
+        super.onPostExecute(bitmap);
+        if (_listener != null)
+            _listener.onImageLoaded(bitmap, _callbackParam);
+    }
+}
-- 
2.17.1