tdf#106648 save current work when switching to other apps

Change-Id: Ieecfad2d0127fec850f7a4f3576a77eec94926b3
Signed-off-by: Mert Tumer <merttumer@outlook.com>
Reviewed-on: https://gerrit.libreoffice.org/58562
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

android/source/src/java/org/libreoffice/LOKitTileProvider.java

@@ -20,6 +20,7 @@ import org.libreoffice.kit.DirectBufferAllocator;
 import org.libreoffice.kit.Document;
 import org.libreoffice.kit.LibreOfficeKit;
 import org.libreoffice.kit.Office;
+import org.libreoffice.ui.FileUtilities;
 import org.mozilla.gecko.gfx.BufferedCairoImage;
 import org.mozilla.gecko.gfx.CairoImage;
 import org.mozilla.gecko.gfx.IntSize;
@@ -65,17 +66,33 @@ class LOKitTileProvider implements TileProvider {
         mOffice.setMessageCallback(messageCallback);
         mOffice.setOptionalFeatures(Document.LOK_FEATURE_DOCUMENT_PASSWORD);
         mContext.setTileProvider(this);
-
         mInputFile = input;
+        File f = new File(mInputFile);
+        final String cacheFile = mContext.getExternalCacheDir().getAbsolutePath() + "/lo_cached_" + f.getName();
+
+        if(mContext.firstStart){
+            File cacheFileObj = new File(cacheFile);
+            if(cacheFileObj.exists()) {
+                cacheFileObj.delete();
+            }
+            mContext.firstStart=false;
+        }
 
         Log.i(LOGTAG, "====> Loading file '" + input + "'");
-        File fileToBeEncoded = new File(input);
+        File fileToBeEncoded;
+        if(isDocumentCached()){
+            fileToBeEncoded = new File(cacheFile);
+        }else{
+            fileToBeEncoded = new File(input);
+
+        }
         String encodedFileName = android.net.Uri.encode(fileToBeEncoded.getName());
 
         mDocument = mOffice.documentLoad(
                 (new File(fileToBeEncoded.getParent(),encodedFileName)).getPath()
         );
 
+
         if (mDocument == null && !mContext.isPasswordProtected()) {
             Log.i(LOGTAG, "====> mOffice.documentLoad() returned null, trying to restart 'Office' and loading again");
             mOffice.destroy();
@@ -325,6 +342,43 @@ class LOKitTileProvider implements TileProvider {
         LOKitShell.hideProgressSpinner(mContext);
     }
 
+    public boolean isDocumentCached(){
+        File input = new File(mInputFile);
+        final String cacheFile = mContext.getExternalCacheDir().getAbsolutePath() + "/lo_cached_" + input.getName();
+        File cacheFileObj = new File(cacheFile);
+        if(cacheFileObj.exists())
+            return true;
+
+        return false;
+    }
+
+    public void cacheDocument() {
+        String cacheDir = mContext.getExternalCacheDir().getAbsolutePath();
+        File input = new File(mInputFile);
+        final String cacheFile = cacheDir + "/lo_cached_" + input.getName();
+        Log.i(LOGTAG, "cacheDocument: " + cacheFile);
+        if(isDocumentCached()){
+            LOKitShell.sendEvent(new LOEvent(LOEvent.UNO_COMMAND, ".uno:Save"));
+        }else{
+            mDocument.saveAs("file://"+cacheFile, FileUtilities.getExtension(input.getPath()).substring(1),"");
+        }
+    }
+
+    public void saveDocument(){
+        if(isDocumentCached()){
+            String format = FileUtilities.getExtension(mInputFile).substring(1);
+            String cacheDir = mContext.getExternalCacheDir().getAbsolutePath();
+            File input = new File(mInputFile);
+            final String cacheFile = cacheDir + "/lo_cached_" + input.getName();
+            String path = input.getAbsolutePath();
+            saveDocumentAs(path, format);
+            (new File(cacheFile)).delete();
+        }else{
+            mContext.saveDocument();
+        }
+    }
+
+
     private void setupDocumentFonts() {
         String values = mDocument.getCommandValues(".uno:CharFontName");
         if (values == null || values.isEmpty())

android/source/src/java/org/libreoffice/LibreOfficeMainActivity.java

@@ -89,6 +89,7 @@ public class LibreOfficeMainActivity extends AppCompatActivity implements Settin
     private File mTempFile = null;
     private File mTempSlideShowFile = null;
     private String newDocumentType = null;
+    public boolean firstStart = true;
 
     BottomSheetBehavior bottomToolbarSheetBehavior;
     BottomSheetBehavior toolbarColorPickerBottomSheetBehavior;
@@ -460,7 +461,7 @@ public class LibreOfficeMainActivity extends AppCompatActivity implements Settin
                         if (isNewDocument) {
                             saveAs();
                         } else {
-                            saveDocument();
+                            mTileProvider.saveDocument();
                         }
                         isDocumentChanged=false;
                         onBackPressed();
@@ -961,6 +962,14 @@ public class LibreOfficeMainActivity extends AppCompatActivity implements Settin
         mFormattingController.handleActivityResult(requestCode, resultCode, data);
         hideBottomToolbar();
     }
+
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        //save document to cache
+        mTileProvider.cacheDocument();
+    }
+
 }
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

android/source/src/java/org/libreoffice/ToolbarController.java

@@ -165,7 +165,7 @@ public class ToolbarController implements Toolbar.OnMenuItemClickListener {
                 if (mContext.isNewDocument) {
                     mContext.saveAs();
                 } else {
-                    mContext.saveDocument();
+                    mContext.getTileProvider().saveDocument();
                 }
                 return true;
             case R.id.action_parts: