Work on attachments

src/models/attachment.ts

@@ -0,0 +1,51 @@
+export class UploadPromise<Type> {
+  wrappedPromise: Promise<Type>;
+  aborted: boolean = false;
+  onAbort: (() => void) | undefined = undefined;
+
+  constructor(wrappedPromise: Promise<Type>) {
+    this.wrappedPromise = wrappedPromise;
+  }
+
+  abort() {
+    this.aborted = true;
+    if (this.onAbort) {
+      this.onAbort();
+    }
+  }
+
+  then(resolve: any, reject: any) {
+    this.wrappedPromise = this.wrappedPromise.then(resolve, reject);
+    return this;
+  }
+
+  catch(handler: any) {
+    this.wrappedPromise = this.wrappedPromise.catch(handler);
+    return this;
+  }
+}
+
+export type AttachmentSendStatus = "initial" | "sending" | "sent" | "canceled" | "failed";
+
+export type AttachmentSendInfo = {
+  status: AttachmentSendStatus;
+  statusDate: number; //ms
+  mediaEventId: string | undefined;
+  progress: number;
+  promise: UploadPromise<string> | undefined;
+  randomRotation: number; // For UI effects
+  randomTranslationX: number; // For UI effects
+  randomTranslationY: number; // For UI effects
+};
+
+export type Attachment = {
+  status: "loading" | "loaded";
+  file: File;
+  dimensions?: { width: number; height: number };
+  scaledFile?: File;
+  scaledDimensions?: { width: number; height: number };
+  useScaled: boolean;
+  src?: string;
+  proof?: any;
+  sendInfo?: AttachmentSendInfo;
+};