DrawListener

```
public interface DrawListener
```
DrawListener. This interface provides a basic capability for responding to keyboard in mouse events from Draw via callbacks. You can see some examples in Section 3.6.
For additional documentation, see Section 3.1 of Computer Science: An Interdisciplinary Approach by Robert Sedgewick and Kevin Wayne.

方法概要

修饰符和类型	方法	说明
`void`	`keyPressed(int keycode)`	Invoked when a key has been pressed.
`void`	`keyReleased(int keycode)`	Invoked when a key has been released.
`void`	`keyTyped(char c)`	Invoked when a key has been typed.
`void`	`mouseClicked(double x, double y)`	Invoked when the mouse has been clicked (pressed and released).
`void`	`mouseDragged(double x, double y)`	Invoked when the mouse has been dragged.
`void`	`mousePressed(double x, double y)`	Invoked when the mouse has been pressed.
`void`	`mouseReleased(double x, double y)`	Invoked when the mouse has been released.

- 方法详细资料
  - mousePressed
```
void mousePressed(double x,
                  double y)
```
    Invoked when the mouse has been pressed.
    
    参数:
    
    x - the x-coordinate of the mouse
    
    y - the y-coordinate of the mouse
  - mouseDragged
```
void mouseDragged(double x,
                  double y)
```
    Invoked when the mouse has been dragged.
    
    参数:
    
    x - the x-coordinate of the mouse
    
    y - the y-coordinate of the mouse
  - mouseReleased
```
void mouseReleased(double x,
                   double y)
```
    Invoked when the mouse has been released.
    
    参数:
    
    x - the x-coordinate of the mouse
    
    y - the y-coordinate of the mouse
  - mouseClicked
```
void mouseClicked(double x,
                  double y)
```
    Invoked when the mouse has been clicked (pressed and released).
    
    参数:
    
    x - the x-coordinate of the mouse
    
    y - the y-coordinate of the mouse
  - keyTyped
```
void keyTyped(char c)
```
    Invoked when a key has been typed.
    
    参数:
    
    c - the character typed
  - keyPressed
```
void keyPressed(int keycode)
```
    Invoked when a key has been pressed.
    
    参数:
    
    keycode - the key combination pressed
  - keyReleased
```
void keyReleased(int keycode)
```
    Invoked when a key has been released.
    
    参数:
    
    keycode - the key combination released