Resolved #142: Modal views.

apps/modal-views-demo/app.ts

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+import application = require("application");
+application.mainModule = "main-page";
+application.start();

apps/modal-views-demo/login-page.ts

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+import observable = require("data/observable");
+import pages = require("ui/page");
+import textField = require("ui/text-field");
+
+var context: any;
+var closeCallback: Function;
+
+var page: pages.Page;
+var usernameTextField: textField.TextField;
+var passwordTextField: textField.TextField;
+
+export function onShownModally(args: pages.ShownModallyData) {
+    console.log("login-page.onShownModally, context: " + args.context);
+    context = args.context;
+    closeCallback = args.closeCallback;
+}
+
+export function onLoaded(args: observable.EventData) {
+    console.log("login-page.onLoaded");
+    page = <pages.Page>args.object;
+    usernameTextField = page.getViewById<textField.TextField>("username");
+    passwordTextField = page.getViewById<textField.TextField>("password");
+}
+
+export function onUnloaded() {
+    console.log("login-page.onUnloaded");
+}
+
+export function onLoginButtonTap() {
+    console.log("login-page.onLoginButtonTap");
+    closeCallback(usernameTextField.text, passwordTextField.text);
+}

apps/modal-views-demo/login-page.xml

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+<Page xmlns="http://www.nativescript.org/tns.xsd" shownModally="onShownModally" loaded="onLoaded" unloaded="onUnloaded">
+  <StackLayout>
+    <TextField hint="username" id="username"/>
+    <TextField hint="password" id="password" secure="true"/>
+    <Button text="Login" tap="onLoginButtonTap"/>
+  </StackLayout>
+</Page>

apps/modal-views-demo/main-page.ts

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+import observable = require("data/observable");
+import pages = require("ui/page");
+import labelModule = require("ui/label");
+
+var page: pages.Page;
+var label: labelModule.Label;
+
+export function pageLoaded(args: observable.EventData) {
+    page = <pages.Page>args.object;
+    label = page.getViewById<labelModule.Label>("label");
+}
+
+export function onTap(args: observable.EventData) {
+    page.showModal("./modal-views-demo/login-page", "some custom context", function(username: string, password: string) {
+        console.log(username + "/" + password);
+        label.text = username + "/" + password;
+    });
+}

apps/modal-views-demo/main-page.xml

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+<Page xmlns="http://www.nativescript.org/tns.xsd" loaded="pageLoaded" id="_mainPage">
+  <StackLayout>
+    <Button text="Login" tap="onTap" />
+    <Label id="label" text="Anonymous"/>
+  </StackLayout>
+</Page>

apps/modal-views-demo/package.json

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+{ "name" : "modal-views-demo",
+  "main" : "app.js" }