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Nifty GUI is a Java Library that supports the building of interactive user interfaces for games or similar applications. It utilizes OpenGL for rendering and it can be easily integrated into many rendering systems. The configuration of the GUI is stored in xml files with little supporting Java code. In short Nifty helps you to layout stuff, display it in a cool way and interact with it :)

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package de.lessvoid.nifty.elements;

import de.lessvoid.nifty.Nifty;
import de.lessvoid.nifty.NiftyMethodInvoker;
import de.lessvoid.nifty.input.NiftyMouseInputEvent;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public abstract class MouseClickMethods {
  @Nullable
  private NiftyMethodInvoker onClickMethod;
  @Nullable
  private NiftyMethodInvoker onMultiClickMethod;
  @Nullable
  private NiftyMethodInvoker onClickMouseMoveMethod;
  @Nullable
  private NiftyMethodInvoker onReleaseMethod;
  @Nonnull
  protected final Element element;

  public MouseClickMethods(@Nonnull final Element element) {
    this.element = element;
  }

  public void setMultiClickMethod(@Nullable NiftyMethodInvoker onMultiClickMethod){
    this.onMultiClickMethod = onMultiClickMethod;
  }

  public void setOnClickMethod(@Nullable NiftyMethodInvoker onClickMethod) {
    this.onClickMethod = onClickMethod;
  }

  public void setOnClickMouseMoveMethod(@Nullable NiftyMethodInvoker onClickMouseMoveMethod) {
    this.onClickMouseMoveMethod = onClickMouseMoveMethod;
  }

  public void setOnReleaseMethod(@Nullable NiftyMethodInvoker onReleaseMethod) {
    this.onReleaseMethod = onReleaseMethod;
  }

  public void onInitialClick() {
  }

  public boolean onClick(
      @Nonnull final Nifty nifty,
      @Nullable final String onClickAlternateKey,
      @Nonnull final NiftyMouseInputEvent inputEvent) {
    if (onClickMethod != null) {
      nifty.setAlternateKey(onClickAlternateKey);
      return onClickMethod.invoke(inputEvent.getMouseX(), inputEvent.getMouseY());
    }
    return false;
  }
  
  public boolean onMultiClick(
      @Nonnull final Nifty nifty,
      @Nullable final String onClickAlternateKey,
      @Nonnull final NiftyMouseInputEvent inputEvent,
      int clickCount) {
    if (onMultiClickMethod != null) {
      nifty.setAlternateKey(onClickAlternateKey);
      return onMultiClickMethod.invoke(inputEvent.getMouseX(), inputEvent.getMouseY(),clickCount);
    }
    return false;
  }

  public boolean onClickMouseMove(@Nonnull final Nifty nifty, @Nonnull final NiftyMouseInputEvent inputEvent) {
    if (onClickMouseMoveMethod != null) {
      return onClickMouseMoveMethod.invoke(inputEvent.getMouseX(), inputEvent.getMouseY());
    }
    return false;
  }

  public boolean onRelease(@Nonnull final Nifty nifty, @Nonnull final NiftyMouseInputEvent mouseEvent) {
    if (onReleaseMethod != null) {
      return onReleaseMethod.invoke();
    }
    return false;
  }

  public void clickAndRelease(@Nonnull final Nifty nifty) {
    if (onClickMethod != null) {
      onClickMethod.invoke();
    }
    if (onReleaseMethod != null) {
      onReleaseMethod.invoke();
    }
  }
}