WIP: added autohiding statusbar with scrollView.SetOnScrollChangeListener()

app/src/main/assets/dark.css

@@ -178,7 +178,7 @@ h2:after {
    ========================================================================== */
 
 #content {
-  margin-top: 1em;
+  margin-top: 100px;
   min-height: 30em;
 }
 

app/src/main/assets/main.css

@@ -168,7 +168,7 @@ h2:after {
    ========================================================================== */
 
 #content {
-  margin-top: 1em;
+  margin-top: 100px;
   min-height: 30em;
 }
 

app/src/main/assets/solarized.css

@@ -185,7 +185,7 @@ h2:after {
    ========================================================================== */
 
 #content {
-  margin-top: 1em;
+  margin-top: 100px;
   min-height: 30em;
 }
 

app/src/main/java/fr/gaulupeau/apps/Poche/data/Settings.java

@@ -368,6 +368,10 @@ public boolean isFullscreenArticleView() {
         return getBoolean(R.string.pref_key_ui_article_fullscreen, false);
     }
 
+    public boolean isAutoFullscreenArticleView() {
+        return getBoolean(R.string.pref_key_ui_article_fullscreen_auto, true);
+    }
+
     public void setFullScreenArticleView(boolean value) {
         setBoolean(R.string.pref_key_ui_article_fullscreen, value);
     }

app/src/main/java/fr/gaulupeau/apps/Poche/ui/ReadArticleActivity.java

@@ -35,6 +35,7 @@
 import android.widget.ScrollView;
 import android.widget.TextView;
 import android.widget.Toast;
+import android.support.v7.widget.Toolbar;
 
 import com.di72nn.stuff.wallabag.apiwrapper.WallabagService;
 
@@ -144,6 +145,9 @@ public class ReadArticleActivity extends BaseActionBarActivity {
     private boolean onPageFinishedCallPostponedUntilResume;
     private boolean loadingFinished;
 
+    private boolean isFullscreen;
+    private View decorView;
+
     public void onCreate(Bundle savedInstanceState) {
 
         settings = App.getInstance().getSettings();
@@ -153,7 +157,7 @@ public void onCreate(Bundle savedInstanceState) {
             getWindow().setFlags(
                     WindowManager.LayoutParams.FLAG_FULLSCREEN,
                     WindowManager.LayoutParams.FLAG_FULLSCREEN
-                    );
+            );
             ActionBar actionBar = super.getSupportActionBar();
             if(actionBar != null) actionBar.hide();
         }
@@ -199,7 +203,35 @@ public void onCreate(Bundle savedInstanceState) {
         // article is loaded - update menu
         invalidateOptionsMenu();
 
+        // Grab the action bar and decorView for making reading view fullscreen
+        decorView = getWindow().getDecorView();
+        isFullscreen = false;
+
+        // Toggle stable and fullscreen layout flags so everything is overlaid by the
+        // actionbar AND the status bar when article is opened
+        decorView.setSystemUiVisibility(
+                View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+        );
+
+
         scrollView = (ScrollView)findViewById(R.id.scroll);
+
+//        // Hide status and action bar when scrolling down, show when scrolling up
+//        // TODO: change to a method compatible with API 14.
+        if (Build.VERSION.SDK_INT >= 23 && settings.isAutoFullscreenArticleView()) {
+            scrollView.setOnScrollChangeListener(new View.OnScrollChangeListener(){
+                @Override
+                public void onScrollChange(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
+                    if (oldScrollY - scrollY > 5 && isFullscreen){
+                        isFullscreen = goFullscreen(false);
+                    } else if (oldScrollY - scrollY < -5 && !isFullscreen) {
+                        isFullscreen = goFullscreen(true);
+                    }
+                }
+            });
+        }
+
         scrollViewLastChild = scrollView.getChildAt(scrollView.getChildCount() - 1);
         webViewContent = (WebView)findViewById(R.id.webViewContent);
         loadingPlaceholder = (TextView)findViewById(R.id.tv_loading_article);
@@ -481,6 +513,24 @@ public void onArticlesChangedEvent(ArticlesChangedEvent event) {
         }
     }
 
+    private boolean goFullscreen(boolean gofs) {
+        // Hide both status bar and action bar if true else, show them
+        if(gofs){
+            decorView.setSystemUiVisibility(
+                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                            | View.SYSTEM_UI_FLAG_FULLSCREEN
+            );
+            return true;
+        } else {
+            decorView.setSystemUiVisibility(
+                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+            );
+            return false;
+        }
+    }
+
     private void showDisableTouchToast() {
         Toast.makeText(this, disableTouch
                         ? R.string.message_disableTouch_inputDisabled
@@ -598,22 +648,28 @@ public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float ve
 
             @Override
             public boolean onSingleTapConfirmed(MotionEvent e) {
-                if(!tapToScroll) return false;
-
                 if(e.getPointerCount() > 1) return false;
 
-                int viewHeight = scrollView.getHeight();
-                float y = e.getY() - scrollView.getScrollY();
+                float x = e.getX();
+                int viewWidth = scrollView.getWidth();
 
-                if(y > viewHeight * 0.25 && y < viewHeight * 0.75) {
-                    int viewWidth = scrollView.getWidth();
-                    float x = e.getX();
+                if(tapToScroll) {
+                    int viewHeight = scrollView.getHeight();
+                    float y = e.getY() - scrollView.getScrollY();
+                    if (y > viewHeight * 0.25 && y < viewHeight * 0.75) {
 
-                    if(x < viewWidth * 0.3) { // left part
-                        scroll(true, screenScrollingPercent, smoothScrolling, false);
-                    } else if(x > viewWidth * 0.7) { // right part
-                        scroll(false, screenScrollingPercent, smoothScrolling, false);
+                        if (x < viewWidth * 0.3) { // left part
+                            scroll(true, screenScrollingPercent, smoothScrolling, false);
+                        } else if (x > viewWidth * 0.7) { // right part
+                            scroll(false, screenScrollingPercent, smoothScrolling, false);
+                        }
                     }
+                    // TODO: Maybe enable this with option in settings menu?
+                    // Toggle fullscreen if touching center of screen
+                }
+
+                if(x > viewWidth * 0.3 && x < viewWidth * 0.7){
+                    isFullscreen = goFullscreen(!isFullscreen);
                 }
 
                 return false;

app/src/main/res/values/strings-preference-keys.xml

@@ -35,6 +35,7 @@
     <string name="pref_key_ui_screenScrolling_smooth" translatable="false">ui.screenScrolling.smooth</string>
     <string name="pref_key_ui_misc_category" translatable="false">ui.misc.category</string>
     <string name="pref_key_ui_article_fullscreen" translatable="false">ui.article.fullscreen</string>
+    <string name="pref_key_ui_article_fullscreen_auto" translatable="false">ui.article.fullscreen_auto</string>
     <string name="pref_key_ui_disableTouch_enabled" translatable="false">ui.disableTouch.enabled</string>
     <string name="pref_key_ui_disableTouch_lastState" translatable="false">ui.disableTouch.lastState</string>
     <string name="pref_key_ui_disableTouch_keyCode" translatable="false">ui.disableTouch.keyCode</string>

app/src/main/res/values/strings.xml

@@ -198,6 +198,8 @@
     <string name="pref_desc_ui_article_textAlignment_justify">Stretches lines to equal width (like in newspapers)</string>
     <string name="pref_name_ui_article_fullscreen">Fullscreen Article View</string>
     <string name="pref_desc_ui_article_fullscreen">Hides system and app bars when reading articles</string>
+    <string name="pref_name_ui_article_fullscreen_auto">Fullscreen Article View on Scroll</string>
+    <string name="pref_desc_ui_article_fullscreen_auto">Hides/Shows system and app bars automatically scroll. Only works on Android 6.0 and above.</string>
     <string name="pref_name_ui_readingSpeed">Reading speed</string>
     <string name="pref_desc_ui_readingSpeed">Your reading speed (measured in words per minute). Used to calculate estimated reading time.</string>
     <string name="pref_name_ui_keepScreenOn">Keep screen on while reading</string>

app/src/main/res/xml/preferences.xml

@@ -150,6 +150,11 @@
                 android:title="@string/pref_name_ui_article_fullscreen"
                 android:summary="@string/pref_desc_ui_article_fullscreen"
                 android:defaultValue="false"/>
+            <CheckBoxPreference
+                android:key="@string/pref_key_ui_article_fullscreen_auto"
+                android:title="@string/pref_name_ui_article_fullscreen_auto"
+                android:summary="@string/pref_desc_ui_article_fullscreen_auto"
+                android:defaultValue="true"/>
             <CheckBoxPreference
                 android:key="@string/pref_key_ui_disableTouch_enabled"
                 android:title="@string/pref_name_ui_disableTouch_enabled"