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#ifndef MOZC_RENDERER_RENDERER_INTERFACE_H_
#define MOZC_RENDERER_RENDERER_INTERFACE_H_

namespace mozc {

namespace commands {
class RendererCommand;   // protocol buffer
}

namespace client {
class SendCommandInterface;
}

namespace renderer {

// An abstract interface class for renderer
class RendererInterface {
 public:
  RendererInterface() {}
  virtual ~RendererInterface() {}

  // Activate candidate window.
  // For instance, if the renderer is out-proc renderer,
  // Activate can launch renderer process.
  // Activate must not have any visible change.
  // If the renderer is already activated, this method does nothing
  // and return false.
  virtual bool Activate() = 0;

  // return true if the renderer is available
  virtual bool IsAvailable() const = 0;

  // exec stateless rendering command
  // TODO(taku): RendererCommand should be stateless.
  virtual bool ExecCommand(const commands::RendererCommand &command) = 0;

  // set mouse callback handler.
  // default implementation is empty
  virtual void SetSendCommandInterface(
      client::SendCommandInterface *send_command_interface) {}
};
}  // renderer
}  // mozc
#endif  // MOZC_RENDERER_RENDERER_INTERFACE_H_