Method StartEventLoop

Rendering/UI/vtkAndroidRenderWindowInteractor.cxx:251–308

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//------------------------------------------------------------------------------
void vtkAndroidRenderWindowInteractor::StartEventLoop()
{
  this->StartedMessageLoop = 1;
  this->Done = false;

  LOGW("Starting event loop");
  while (!this->Done)
  {
    // Read all pending events.
    int ident;
    int events;
    struct android_poll_source* source;

    ident = ALooper_pollOnce(500, nullptr, &events, (void**)&source);
    if (ident == ALOOPER_POLL_TIMEOUT)
    {
      // just watch for resize events
      if (this->AndroidApplication->window && this->Enabled)
      {
        // so it seems that andoid's configuration changes first
        // then the size of the native window changes a bit later
        // then after some rendering is done the egl surface gets resized
        // we try to handle that mess by watching for when the native window
        // changes size, then we update our size, render to push the change
        // down to egl, then render again.  I suspect there may be a
        // better way to get the change down to egl than doing a full render
        int width = ANativeWindow_getWidth(this->AndroidApplication->window);
        int height = ANativeWindow_getHeight(this->AndroidApplication->window);
        if (width != this->Size[0] || height != this->Size[1])
        {
          this->UpdateSize(width, height);
          this->RenderWindow->Render();
          this->RenderWindow->Render();
          vtkErrorMacro("Config Resized to " << width << " by " << height);
        }
      }
    }

    if (ident >= 0)
    {
      LOGW("Processing Event");
      // Process this event.
      if (source != nullptr)
      {
        source->process(this->AndroidApplication, source);
      }

      // Check if we are exiting.
      if (this->AndroidApplication->destroyRequested != 0)
      {
        LOGW("Destroying Window");
        this->RenderWindow->Finalize();
        LOGW("Destroyed");
        return;
      }
    }
  }
}