spiegel-keyman/web/source/osk/embedded/pendingLongpress.ts

/// <reference path="subkeyDelegator.ts" />
/// <reference path="../pendingGesture.interface.ts" />

namespace com.keyman.osk.embedded {
  /**
   * As control over the subkey display timer and the subkey popup are
   * both handled by the host app within the Android app, this class
   * serves mostly to communicate longpress state management from the
   * app to the VisualKeyboard.
   * 
   * The `resolve()` function should be triggered by the host app
   * whenever it has recognized a completed longpress and has thus
   * begun displaying its subkey popup.  (Should these two events
   * ever become separated in time, the latter is the more critical
   * aspect.)
   */
  export class PendingLongpress implements PendingGesture {
    private resolver: (delegator: SubkeyDelegator) => void;
    private readonly vkbd: VisualKeyboard;

    public readonly baseKey: KeyElement;
    public readonly promise: Promise<SubkeyDelegator>;

    constructor(vkbd: VisualKeyboard, e: KeyElement) {
      this.vkbd = vkbd;
      let _this = this;

      this.promise = new Promise<SubkeyDelegator>(function(resolve) {
        _this.resolver = resolve;
      });
      this.baseKey = e;
    }

    public resolve() {
      if(this.resolver) {
        this.resolver(new SubkeyDelegator(this.vkbd, this.baseKey));
      }
      this.resolver = null;
    }

    public cancel() {
      if(this.resolver) {        
        this.resolver(null);
        this.resolver = null;
      }
    }
  }
}