Add title.topMargin option (#5163)

Useful for aligning the title when TopBar height is changed.

lib/android/app/src/main/java/com/reactnativenavigation/parse/TitleOptions.java

@@ -32,6 +32,7 @@ public class TitleOptions {
         options.fontFamily = typefaceManager.getTypeFace(json.optString("fontFamily", ""));
         options.alignment = Alignment.fromString(TextParser.parse(json, "alignment").get(""));
         options.height = NumberParser.parse(json, "height");
+        options.topMargin = NumberParser.parse(json, "topMargin");
 
         return options;
     }
@@ -43,6 +44,7 @@ public class TitleOptions {
     @Nullable public Typeface fontFamily;
     public Component component = new Component();
     public Number height = new NullNumber();
+    public Number topMargin = new NullNumber();
 
     void mergeWith(final TitleOptions other) {
         if (other.text.hasValue()) text = other.text;
@@ -52,6 +54,7 @@ public class TitleOptions {
         if (other.alignment != Alignment.Default) alignment = other.alignment;
         if (other.component.hasValue()) component = other.component;
         if (other.height.hasValue()) height = other.height;
+        if (other.topMargin.hasValue()) topMargin = other.topMargin;
     }
 
     void mergeWithDefault(TitleOptions defaultOptions) {
@@ -62,5 +65,6 @@ public class TitleOptions {
         if (alignment == Alignment.Default) alignment = defaultOptions.alignment;
         component.mergeWithDefault(defaultOptions.component);
         if (!height.hasValue()) height = defaultOptions.height;
+        if (!topMargin.hasValue()) topMargin = defaultOptions.topMargin;
     }
 }

lib/android/app/src/main/java/com/reactnativenavigation/presentation/StackPresenter.java

@@ -171,6 +171,7 @@ public class StackPresenter {
 
         topBar.setTitleHeight(options.title.height.get(UiUtils.getTopBarHeightDp(activity)));
         topBar.setTitle(options.title.text.get(""));
+        topBar.setTitleTopMargin(options.title.topMargin.get(0));
 
         if (options.title.component.hasValue()) {
             if (titleControllers.containsKey(component)) {
@@ -400,6 +401,7 @@ public class StackPresenter {
 
         if (options.title.height.hasValue()) topBar.setTitleHeight(options.title.height.get());
         if (options.title.text.hasValue()) topBar.setTitle(options.title.text.get());
+        if (options.title.topMargin.hasValue()) topBar.setTitleTopMargin(options.title.topMargin.get());
 
         if (options.title.component.hasValue()) {
             if (titleControllers.containsKey(component)) {

lib/android/app/src/main/java/com/reactnativenavigation/views/titlebar/TitleBar.java

@@ -226,6 +226,16 @@ public class TitleBar extends Toolbar {
         setLayoutParams(lp);
     }
 
+    public void setTopMargin(int topMargin) {
+        int pixelTopMargin = UiUtils.dpToPx(getContext(), topMargin);
+        if (getLayoutParams() instanceof MarginLayoutParams) {
+            MarginLayoutParams lp = (MarginLayoutParams) getLayoutParams();
+            if (lp.topMargin == pixelTopMargin) return;
+            lp.topMargin = pixelTopMargin;
+            setLayoutParams(lp);
+        }
+    }
+
     public void setOverflowButtonColor(int color) {
         ActionMenuView actionMenuView = ViewUtils.findChildByClass(this, ActionMenuView.class);
         if (actionMenuView != null) {

lib/android/app/src/main/java/com/reactnativenavigation/views/topbar/TopBar.java

@@ -122,6 +122,10 @@ public class TopBar extends AppBarLayout implements ScrollEventListener.ScrollAw
         titleBar.setHeight(height);
     }
 
+    public void setTitleTopMargin(int topMargin) {
+        titleBar.setTopMargin(topMargin);
+    }
+
     public void setTitle(String title) {
         titleBar.setTitle(title);
     }