关键代码:
scene.setOnMousePressed(event -> {
OffsetX = event.getSceneX();
OffsetY = event.getSceneY();
});
//鼠标拖动窗口
scene.setOnMouseDragged(event -> {
stage.setX(event.getScreenX() - OffsetX);
stage.setY(event.getScreenY() - OffsetY);
});