feat(android): allow ability to set drawer gravity

android/modules/ui/src/java/ti/modules/titanium/ui/android/DrawerLayoutProxy.java

@@ -9,15 +9,13 @@
 import ti.modules.titanium.ui.widget.TiUIDrawerLayout;
 
 import org.appcelerator.kroll.annotations.Kroll;
-import org.appcelerator.kroll.common.Log;
-import org.appcelerator.kroll.KrollProxy;
 import org.appcelerator.titanium.proxy.TiViewProxy;
 import org.appcelerator.titanium.TiC;
-import org.appcelerator.titanium.util.TiConvert;
 import org.appcelerator.titanium.view.TiUIView;
 
 import android.app.Activity;
 import android.support.v4.widget.DrawerLayout;
+import android.view.Gravity;
 
 @Kroll.proxy(creatableInModule = AndroidModule.class)
 public class DrawerLayoutProxy extends TiViewProxy
@@ -30,6 +28,12 @@ public class DrawerLayoutProxy extends TiViewProxy
 	public static final int LOCK_MODE_UNLOCKED = DrawerLayout.LOCK_MODE_UNLOCKED;
 	@Kroll.constant
 	public static final int LOCK_MODE_UNDEFINED = DrawerLayout.LOCK_MODE_UNDEFINED;
+	@Kroll.constant
+	public static final int GRAVITY_NONE = Gravity.NO_GRAVITY;
+	@Kroll.constant
+	public static final int GRAVITY_LEFT = Gravity.LEFT;
+	@Kroll.constant
+	public static final int GRAVITY_RIGHT = Gravity.RIGHT;
 
 	private static final String TAG = "DrawerLayoutProxy";
 
@@ -220,6 +224,27 @@ public void setDrawerLockMode(Object arg)
 		setPropertyAndFire(TiC.PROPERTY_DRAWER_LOCK_MODE, arg);
 	}
 
+	// clang-format off
+	@Kroll.method
+	@Kroll.getProperty
+	public int getDrawerGravity()
+	// clang-format on
+	{
+		if (hasProperty(TiC.PROPERTY_DRAWER_GRAVITY)) {
+			return (Integer) getProperty(TiC.PROPERTY_DRAWER_GRAVITY);
+		}
+		return Gravity.NO_GRAVITY;
+	}
+
+	// clang-format off
+	@Kroll.method
+	@Kroll.setProperty
+	public void setDrawerGravity(Object arg)
+	// clang-format on
+	{
+		setPropertyAndFire(TiC.PROPERTY_DRAWER_GRAVITY, arg);
+	}
+
 	@Kroll.method
 	public void interceptTouchEvent(TiViewProxy view, Boolean disallowIntercept)
 	{

android/modules/ui/src/java/ti/modules/titanium/ui/widget/TiUIDrawerLayout.java

@@ -415,8 +415,16 @@ public void processProperties(KrollDict d)
 				rightFrame.getLayoutParams().width = LayoutParams.MATCH_PARENT;
 			}
 		}
-		if (d.containsKey(TiC.PROPERTY_DRAWER_LOCK_MODE)) {
-			layout.setDrawerLockMode(TiConvert.toInt(d.get(TiC.PROPERTY_DRAWER_LOCK_MODE)));
+		if (d.containsKey(TiC.PROPERTY_DRAWER_LOCK_MODE) || d.containsKey(TiC.PROPERTY_DRAWER_GRAVITY)) {
+			int lockMode = TiConvert.toInt(d.get(TiC.PROPERTY_DRAWER_LOCK_MODE),
+										   ((DrawerLayoutProxy) getProxy()).getDrawerLockMode());
+			int gravity = TiConvert.toInt(d.get(TiC.PROPERTY_DRAWER_GRAVITY),
+										  ((DrawerLayoutProxy) getProxy()).getDrawerGravity());
+			if (gravity != Gravity.NO_GRAVITY) {
+				layout.setDrawerLockMode(lockMode, gravity);
+			} else {
+				layout.setDrawerLockMode(lockMode);
+			}
 		}
 		// If theme has default ActionBar ignore `toolbarEnabled` and `toolbar` properties
 		if (!this.themeHasActionBar) {
@@ -536,7 +544,15 @@ public void propertyChanged(String key, Object oldValue, Object newValue, KrollP
 			this.rightFrame.setLayoutParams(rightFrameLayout);
 
 		} else if (key.equals(TiC.PROPERTY_DRAWER_LOCK_MODE)) {
-			layout.setDrawerLockMode(TiConvert.toInt(newValue));
+			int gravity = ((DrawerLayoutProxy) getProxy()).getDrawerGravity();
+			if (gravity != Gravity.NO_GRAVITY) {
+				layout.setDrawerLockMode(TiConvert.toInt(newValue), gravity);
+			} else {
+				layout.setDrawerLockMode(TiConvert.toInt(newValue));
+			}
+
+		} else if (key.equals(TiC.PROPERTY_DRAWER_GRAVITY)) {
+			layout.setDrawerLockMode(((DrawerLayoutProxy) getProxy()).getDrawerLockMode(), TiConvert.toInt(newValue));
 
 		} else if (key.equals(TiC.PROPERTY_DRAWER_INDICATOR_ENABLED)) {
 			if (drawerToggle != null) {

android/titanium/src/java/org/appcelerator/titanium/TiC.java

@@ -1548,6 +1548,11 @@ public class TiC
 	 */
 	public static final String PROPERTY_DRAG_MARGIN = "dragMargin";
 
+	/**
+	 * @module.api
+	 */
+	public static final String PROPERTY_DRAWER_GRAVITY = "drawerGravity";
+
 	/**
 	 * @module.api
 	 */

apidoc/Titanium/UI/Android/DrawerLayout.yml

@@ -16,6 +16,27 @@ since: "6.2.0"
 platforms: [android]
 
 properties:
+  - name: GRAVITY_NONE
+    summary: |
+        Use with [DrawerLayout.drawerLockMode](Titanium.UI.Android.DrawerLayout.drawerGravity) to specify the gravity.
+    type: Number
+    permission: read-only
+    since: "8.3.0"
+
+  - name: GRAVITY_LEFT
+    summary: |
+        Use with [DrawerLayout.drawerLockMode](Titanium.UI.Android.DrawerLayout.drawerGravity) to specify the gravity.
+    type: Number
+    permission: read-only
+    since: "8.3.0"
+
+  - name: GRAVITY_RIGHT
+    summary: |
+        Use with [DrawerLayout.drawerLockMode](Titanium.UI.Android.DrawerLayout.drawerGravity) to specify the gravity.
+    type: Number
+    permission: read-only
+    since: "8.3.0"
+
   - name: LOCK_MODE_LOCKED_CLOSED
     summary: |
         Use with [DrawerLayout.drawerLockMode](Titanium.UI.Android.DrawerLayout.drawerLockMode) to specify the drawer is locked closed.
@@ -91,6 +112,13 @@ properties:
     constants: Titanium.UI.Android.DrawerLayout.LOCK_MODE_*
     default: <Titanium.UI.Android.DrawerLayout.LOCK_MODE_UNDEFINED>
 
+  - name: drawerGravity
+    summary: Get or set the drawerGravity
+    type: Number
+    constants: Titanium.UI.Android.DrawerLayout.GRAVITY_*
+    default: <Titanium.UI.Android.DrawerLayout.GRAVITY_BOTH>
+    since: "8.3.0"
+
   - name: toolbarEnabled
     summary: Determine whether to enable the toolbar.
     description: |