package demos.nehe.lesson48;import demos.common.GLDisplay;import javax.swing.*;import javax.swing.event.MouseInputAdapter;import java.awt.event.MouseEvent;import java.awt.event.MouseListener;class InputHandler extends MouseInputAdapter {    private Renderer renderer;    public InputHandler(Renderer renderer, GLDisplay glDisplay) {        this.renderer = renderer;        glDisplay.registerMouseEventForHelp(                MouseEvent.MOUSE_CLICKED, MouseEvent.BUTTON1_DOWN_MASK,                "Toggle display mode"        );    }    public void mouseClicked(MouseEvent e) {        if (SwingUtilities.isRightMouseButton(e)) {            renderer.reset();        }    }    public void mousePressed(MouseEvent mouseEvent) {        if (SwingUtilities.isLeftMouseButton(mouseEvent)) {            renderer.startDrag(mouseEvent.getPoint());        }    }    public void mouseDragged(MouseEvent mouseEvent) {        if (SwingUtilities.isLeftMouseButton(mouseEvent)) {            renderer.drag(mouseEvent.getPoint());        }    }}