improve click block, onKeyboardClose

ionic/platform/platform.ts

@@ -145,7 +145,35 @@ export class IonicPlatform {
     return !this.isPortrait();
   }
 
-  winResize() {
+  isKeyboardOpen() {
+    return dom.hasFocusedTextInput();
+  }
+
+  onKeyboardClose(callback) {
+    const self = this;
+
+    let promise = null;
+
+    if (!callback) {
+      // a callback wasn't provided, so let's return a promise instead
+      promise = new Promise(resolve => { callback = resolve; });
+    }
+
+    function checkKeyboard() {
+      if (!self.isKeyboardOpen()) {
+        callback();
+
+      } else {
+        setTimeout(checkKeyboard, 500);
+      }
+    }
+
+    setTimeout(checkKeyboard, 100);
+
+    return promise;
+  }
+
+  windowResize() {
     let self = this;
     clearTimeout(self._resizeTimer);