Fixed #727: Provide a way to get a reference to the currently showing modal page instance.

ui/page/page-common.ts

@@ -44,6 +44,8 @@ export class Page extends ContentView implements dts.Page {
     private _styleScope: styleScope.StyleScope = new styleScope.StyleScope();
     private _actionBar: ActionBar;
 
+    private _modal: Page;
+
     constructor(options?: dts.Options) {
         super(options);
         this.actionBar = new ActionBar();
@@ -217,6 +219,10 @@ export class Page extends ContentView implements dts.Page {
         }
     }
 
+    public get modal(): Page {
+        return this._modal;
+    }
+
     public _addChildFromBuilder(name: string, value: any) {
         if (value instanceof ActionBar) {
             this.actionBar = value;
@@ -227,6 +233,7 @@ export class Page extends ContentView implements dts.Page {
     }
 
     protected _showNativeModalView(parent: Page, context: any, closeCallback: Function, fullscreen?: boolean) {
+        parent._modal = this;
         var that = this;
         this._closeModalCallback = function () {
             if (that._closeModalCallback) {
@@ -240,7 +247,7 @@ export class Page extends ContentView implements dts.Page {
     }
 
     protected _hideNativeModalView(parent: Page) {
-        //
+        parent._modal = undefined;
     }
 
     protected _raiseShownModallyEvent(parent: Page, context: any, closeCallback: Function) {

ui/page/page.android.ts

@@ -137,6 +137,8 @@ export class Page extends pageCommon.Page {
         this.onUnloaded();
         this._isAddedToNativeVisualTree = false;
         this._onDetached(true);
+
+        super._hideNativeModalView(parent);
     }
 
     public _updateActionBar(hidden: boolean) {

ui/page/page.d.ts

@@ -173,9 +173,14 @@ declare module "ui/page" {
         showModal();
 
         /**
-         * Closes the current modal dialog that this page is showing.
+         * Closes the current modal view that this page is showing.
          */
         closeModal();
+
+        /**
+         * Returns the current modal view that this page is showing (is parent of), if any.
+         */
+        modal: Page;
         
         //@private
 

ui/page/page.ios.ts

@@ -226,6 +226,8 @@ export class Page extends pageCommon.Page {
         this._UIModalPresentationFormSheet = false;
         parent.requestLayout();
         parent._ios.dismissModalViewControllerAnimated(false);
+
+        super._hideNativeModalView(parent);
     }
 
     public _updateActionBar(hidden: boolean) {