📐 Implement resize and related methods

src/events.ts

@@ -7,23 +7,25 @@ export enum MraidEvent {
   Error = "error",
   StateChange = "stateChange",
   ViewableChange = "viewableChange",
+  SizeChange = "sizeChange",
 }
 
 export type EventListener<T1, T2> = (t1: T1, t2: T2) => void;
 export type ErrorEventListener = EventListener<string, SafeString>;
 export type StateChangeEventListener = EventListener<MraidState, void>;
 export type ViewableChangeEventListener = EventListener<boolean, void>;
 export type ReadyEventListener = EventListener<void, void>;
+export type SizeChangeEventListener = EventListener<number, number>;
 
 // Describes functions with possible parameters defined by MRAID spec
 export type MraidEventListener =
   | ErrorEventListener
   | StateChangeEventListener
   | ViewableChangeEventListener
-  | ReadyEventListener;
+  | ReadyEventListener
+  | SizeChangeEventListener;
 
 export class EventsCoordinator {
-  // TODO: Object.values is ES2017. Check if it will work for Android and iOS
   private eventListeners: Map<string, Set<MraidEventListener>> = new Map(
     Object.values(MraidEvent).map((e) => [e, new Set()])
   );
@@ -120,6 +122,12 @@ export class EventsCoordinator {
     });
   }
 
+  fireSizeChangeEvent(width: number, height: number) {
+    this.eventListeners.get(MraidEvent.SizeChange)?.forEach((value) => {
+      (value as SizeChangeEventListener)?.(width, height);
+    });
+  }
+
   private isCorrectEvent(event: MraidEvent): boolean {
     return event && this.eventListeners.has(event);
   }

src/main.ts

@@ -5,6 +5,7 @@ import { AndroidMraidBridge } from "./mraidbridge/androidmraidbridge";
 import { SdkInteractor } from "./mraidbridge/sdkinteractor";
 import { Logger } from "./log/logger";
 import {} from "./mraidwindow";
+import { ResizePropertiesValidator } from "./resize";
 
 export {};
 
@@ -14,7 +15,13 @@ const sdkInteractor = new SdkInteractor([
 ]);
 const eventsCoordinator = new EventsCoordinator();
 const logger = new Logger(eventsCoordinator, sdkInteractor);
+const resizePropertiesValidator = new ResizePropertiesValidator();
 
 window.mraid =
   window.mraid ??
-  new MRAIDImplementation(eventsCoordinator, sdkInteractor, logger);
+  new MRAIDImplementation(
+    eventsCoordinator,
+    sdkInteractor,
+    logger,
+    resizePropertiesValidator
+  );

src/mraid.ts

@@ -21,6 +21,7 @@ import {
   SupportedSdkFeatures,
 } from "./sdkfeature";
 import { initialPosition, Position } from "./position";
+import { ResizeProperties, ResizePropertiesValidator } from "./resize";
 
 export class MRAIDImplementation implements MRAIDApi, SDKApi {
   private eventsCoordinator: EventsCoordinator;
@@ -29,6 +30,8 @@ export class MRAIDImplementation implements MRAIDApi, SDKApi {
 
   private logger: Logger;
 
+  private resizePropertiesValidator: ResizePropertiesValidator;
+
   private currentState = MraidState.Loading;
 
   private placementType = MraidPlacementType.Unknown;
@@ -52,14 +55,18 @@ export class MRAIDImplementation implements MRAIDApi, SDKApi {
 
   private currentPosition = initialPosition.clone();
 
+  private currentResizeProperties?: ResizeProperties = undefined;
+
   constructor(
     eventsCoordinator: EventsCoordinator,
     sdkInteractor: SdkInteractor,
-    logger: Logger
+    logger: Logger,
+    resizePropertiesValidator: ResizePropertiesValidator
   ) {
     this.eventsCoordinator = eventsCoordinator;
     this.sdkInteractor = sdkInteractor;
     this.logger = logger;
+    this.resizePropertiesValidator = resizePropertiesValidator;
 
     this.spreadMraidInstance();
   }
@@ -271,6 +278,90 @@ export class MRAIDImplementation implements MRAIDApi, SDKApi {
     }
   }
 
+  getResizeProperties(): ResizeProperties | undefined {
+    return this.currentResizeProperties?.copy();
+  }
+
+  resize(): void {
+    if (
+      this.currentState !== MraidState.Resized &&
+      this.currentState !== MraidState.Default
+    ) {
+      this.logger.log(
+        LogLevel.Error,
+        "resize",
+        `Can't resize in ${this.currentState} state`
+      );
+      return;
+    }
+
+    if (this.placementType !== MraidPlacementType.Inline) {
+      this.logger.log(
+        LogLevel.Error,
+        "resize",
+        "Resize is only available for inline placement"
+      );
+      return;
+    }
+
+    if (!this.currentResizeProperties) {
+      this.logger.log(
+        LogLevel.Error,
+        "resize",
+        "You must set resize properties before calling resize"
+      );
+    } else {
+      // validate resize properties one more time because position and max size
+      // might have changed by this time
+      const errorMessage = this.resizePropertiesValidator.validate(
+        this.currentResizeProperties,
+        this.currentMaxSize,
+        this.currentPosition
+      );
+      if (errorMessage) {
+        this.logger.log(LogLevel.Error, "resize", errorMessage);
+        return;
+      }
+
+      const {
+        offsetY,
+        height,
+        offsetX,
+        width,
+        customClosePosition,
+        allowOffscreen,
+      } = this.currentResizeProperties;
+      this.sdkInteractor.resize(
+        width,
+        height,
+        offsetX,
+        offsetY,
+        customClosePosition,
+        allowOffscreen
+      );
+    }
+  }
+
+  setResizeProperties(resizeProperties: ResizeProperties | Anything): void {
+    const errorMessage = this.resizePropertiesValidator.validate(
+      resizeProperties,
+      this.currentMaxSize,
+      this.currentPosition
+    );
+    if (errorMessage) {
+      this.logger.log(LogLevel.Error, "setResizeProperties", errorMessage);
+    } else {
+      this.currentResizeProperties = new ResizeProperties(
+        resizeProperties.width,
+        resizeProperties.height,
+        resizeProperties.offsetX,
+        resizeProperties.offsetY,
+        resizeProperties.customClosePosition,
+        resizeProperties.allowOffscreen
+      );
+    }
+  }
+
   // #endregion
 
   // #region SDKApi
@@ -340,6 +431,7 @@ export class MRAIDImplementation implements MRAIDApi, SDKApi {
           "ad is already expanded"
         );
         break;
+      case MraidState.Resized:
       case MraidState.Loading:
       case MraidState.Hidden:
         this.logger.log(
@@ -372,10 +464,30 @@ export class MRAIDImplementation implements MRAIDApi, SDKApi {
       JSON.stringify(this.defaultPosition) === JSON.stringify(initialPosition)
     ) {
       this.defaultPosition = newPosition;
+    } else {
+      // do we need size change for initial size?
+      this.eventsCoordinator.fireSizeChangeEvent(width, height);
     }
     this.currentPosition = newPosition;
   }
 
+  notifyResized(): void {
+    switch (this.currentState) {
+      case MraidState.Default:
+      case MraidState.Resized: {
+        this.updateState(MraidState.Resized);
+        break;
+      }
+      default:
+        this.logger.log(
+          LogLevel.Warning,
+          "notifyResized",
+          `Can't resize from ${this.currentState} state`
+        );
+        break;
+    }
+  }
+
   // #endregion
 
   private updateState(newState: MraidState) {

src/mraidapi.ts

@@ -5,6 +5,7 @@ import { ExpandProperties } from "./expand";
 import { Size } from "./size";
 import { SdkFeature } from "./sdkfeature";
 import { Position } from "./position";
+import { ResizeProperties } from "./resize";
 
 export interface MRAIDApi {
   /**
@@ -183,4 +184,21 @@ export interface MRAIDApi {
    * @param url - the URI of the video or video stream
    */
   playVideo(url: Url | Anything): void;
+
+  /**
+   * The resize method will cause the existing web view to change size using the existing HTML
+   * document
+   */
+  resize(): void;
+
+  /**
+   * @returns current ResizeProperties object
+   */
+  getResizeProperties(): ResizeProperties | undefined;
+
+  /**
+   * Sets resize properties object
+   * @param resizeProperties
+   */
+  setResizeProperties(resizeProperties: ResizeProperties | Anything): void;
 }

src/mraidbridge/androidmraidbridge.ts

@@ -1,5 +1,6 @@
 import { MraidBridge } from "./mraidbridge";
 import { LogLevel } from "../log/loglevel";
+import { ClosePosition } from "../resize";
 
 /**
  * Interaction object is defined in global scope (window) so we are using
@@ -28,6 +29,14 @@ export declare interface CriteoInterface {
   expand(width: number, height: number): void;
   close(): void;
   playVideo(url: string): void;
+  resize(
+    width: number,
+    height: number,
+    offsetX: number,
+    offsetY: number,
+    customClosePosition: string,
+    allowOffscreen: boolean
+  ): void;
 }
 
 export class AndroidMraidBridge implements MraidBridge {
@@ -51,6 +60,24 @@ export class AndroidMraidBridge implements MraidBridge {
     this.getMraidBridge()?.playVideo(url);
   }
 
+  resize(
+    width: number,
+    height: number,
+    offsetX: number,
+    offsetY: number,
+    customClosePosition: ClosePosition,
+    allowOffscreen: boolean
+  ): void {
+    this.getMraidBridge()?.resize(
+      width,
+      height,
+      offsetX,
+      offsetY,
+      customClosePosition,
+      allowOffscreen
+    );
+  }
+
   private getMraidBridge(): CriteoInterface | undefined | null {
     // criteoMraidBridge object is not injected into iframe on Android
     // but doc says it should be. It is always available on topmost window

src/mraidbridge/iosmraidbridge.ts

@@ -1,5 +1,6 @@
 import { MraidBridge } from "./mraidbridge";
 import { LogLevel } from "../log/loglevel";
+import { ClosePosition } from "../resize";
 
 // #region MessageHandler
 
@@ -50,6 +51,15 @@ export declare interface PlayVideoIosMessage extends IosMessage {
   url: string;
 }
 
+export declare interface ResizeIosMessage extends IosMessage {
+  width: number;
+  height: number;
+  offsetX: number;
+  offsetY: number;
+  customClosePosition: string;
+  allowOffscreen: boolean;
+}
+
 // #endregion
 
 export class IosMraidBridge implements MraidBridge {
@@ -95,6 +105,26 @@ export class IosMraidBridge implements MraidBridge {
     this.postMessage(playVideoMessage);
   }
 
+  resize(
+    width: number,
+    height: number,
+    offsetX: number,
+    offsetY: number,
+    customClosePosition: ClosePosition,
+    allowOffscreen: boolean
+  ): void {
+    const resizeMessage: ResizeIosMessage = {
+      action: "resize",
+      width,
+      height,
+      offsetX,
+      offsetY,
+      customClosePosition,
+      allowOffscreen,
+    };
+    this.postMessage(resizeMessage);
+  }
+
   private postMessage(message: IosMessage) {
     window?.webkit?.messageHandlers?.criteoMraidBridge?.postMessage(message);
   }

src/mraidbridge/mraidbridge.ts

@@ -1,4 +1,5 @@
 import { LogLevel } from "../log/loglevel";
+import { ClosePosition } from "../resize";
 
 /**
  * Defines API for interaction with native platforms (iOS and Android)
@@ -10,4 +11,12 @@ export interface MraidBridge {
   expand(width: number, height: number): void;
   close(): void;
   playVideo(url: string): void;
+  resize(
+    width: number,
+    height: number,
+    offsetX: number,
+    offsetY: number,
+    customClosePosition: ClosePosition,
+    allowOffscreen: boolean
+  ): void;
 }