如何创建一个布尔局部变量作为 MouseEvent 的结果?

How to create a boolean local variable as a result of MouseEvent?

我刚刚开始学习 Java,我正在尝试正确初始化来自 MouseEvent 的 4 个变量。

我知道如何获取点击位置,但我不知道如何创建一个布尔型局部变量leftClicked,并在事件期间点击鼠标左键时将其初始化为true。

我已经尝试使用 if 语句来设置一个变量,如果 getButton() 返回 BUTTON1,该变量将结果为 true,但这不适用于我不应该更改的其余代码。

特别是,由于代码第二部分的 if 语句中的 "leftClicked",它不会编译。有人可以在语法和必要元素方面为我指出正确的方向吗?

我意识到这一定是一个非常简单的问题,但我无法理解它。非常感谢您!

/**
 * Processes mouse clicks while the program is in browse mode. 
 * This method is called only after a mouse click is received while in browse mode. 
 * If a left mouse button click hits a photo, it enlarges the photo to a regular format. 
 * If a right mouse button click hits a photo, it shrinks the photo to a thumbnail format.
 **/

private void doBrowsePhoto(MouseEvent e) {

    // please write your code after this line
    int x=e.getX();
    int y=e.getY();

    // boolean?

    // code to be executed after the initialization of the variables x, y, leftClicked and rightClicked
    ColorImage[] photos = model.getPhotos();
    ColorImage photo;
    double scale1, scale2, scaleMean;
    for (int i=0; i<photos.length; i++) {
        photo=photos[i];
        if (isInsideImage(x, y, photo)) {
            scale1=findThumbnailScale(photo);
            scale2=findRegularScale(photo);
            if (rightClicked) {
                photo.setScale(scale1);
            } else if (leftClicked){
                photo.setScale(scale2);
            }
            break;
        }
    }
}
SwingUtilities.isLeftMouseButton(MouseEvent anEvent)

这个方法returns你想要什么。

你可以这样做:

boolean leftClicked = e.getButton() == MouseEvent.BUTTON1;
boolean rightClicked = e.getButton() == MouseEvent.BUTTON2;