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sclass JForwardingLibDownloader is Swingable {
  transient SingleComponentPanel scp;
  
  settable S nameOfLibrary;
  
  // snippet ID of library required for this platform
  settable S libID;

  settable S sizeInformation; // how big is the library?
  
  bool supported() { ret libID() != null; }
  
  selfType forward(IF0<JComponent> forward) {
    this.forward = forward;
    this;
  }
  
  swappable JComponent forward() {
    ret jcenteredlabel(nameOfLibrary() + " enabled");
  }
  
  bool libDownloaded() {
    ret fileExists(DiskSnippetCache_getLibrary(libID()));
  }
  
  bool hasLib() {
    bool has = currentProgramHasLibrary(DiskSnippetCache_getLibrary(libID()));
    print("Video library ID: " + libID() + ", loaded: " + has);
    ret has;
  }
  
  void addLib() {
    if (supported())
      if (addLibraryToCurrentProgram(libID()))
        print(nameOfLibrary() + " loaded: " + libID());
  }
  
  visualize {
    if (scp == null)
      scp = singleComponentPanel(makeComponent());
    ret scp;
  }
  
  JComponent makeComponent() {
    if (!supported())
      ret jcenteredlabel(nameOfLibrary() + " is not yet supported on your platform");
      
    if (libDownloaded()) {
      addLib();
      ret forward();
    } else
      ret jfullcenter(centerAndEastWithMargin(
        jcenteredlabel("Download " + nameOfLibrary() + " for " + platformName() + appendBracketed(sizeInformation()) + "?"),
        jbuttonWithDisable("OK", r addLibWithProgressBar)));
  }
  
  void addLibWithProgressBar {
    scp.setComponent(jcenteredlabel("Downloading " + nameOfLibrary() + "..."));
    try {
      addLib();
      scp.setComponent(forward());
    } catch print e {
      scp.setComponent(jErrorView(e));
    }
  }
}