void SaleDialog::initFindCustomerButton() {

    QString imagePath = QString("%1/find.png").arg(Configs::getInstance().getImagesFolderFilePath());

    QPixmap pixmap(imagePath);

    QIcon icon(imagePath);

    findCustomerButton = new QPushButton(icon, "");

    QSize size = QSize(pixmap.size().width() + 6, pixmap.size().height() + 4);

    findCustomerButton->setMinimumSize(size);

    findCustomerButton->setMaximumSize(size); // 設置按鈕的大小為圖片的大小

    findCustomerButton->setFocusPolicy(Qt::NoFocus); // 得到焦點時，不顯示虛線框

    findCustomerButton->setFlat(true);

    findCustomerButton->setDefault(true);

    findCustomerButton->setToolTip(tr("查找客戶"));

    QHBoxLayout *buttonLayout = new QHBoxLayout();

    buttonLayout->setContentsMargins(0, 0, 0, 0);

    buttonLayout->addStretch();

    buttonLayout->addWidget(findCustomerButton);

    ui->cardNumberLineEdit->setLayout(buttonLayout);

// 設置輸入框中文件輸入區，不讓輸入的文字在被隱藏在按鈕下

    ui->cardNumberLineEdit->setTextMargins(0, 1, pixmap.size().width(), 1); 

    connect(findCustomerButton, SIGNAL(clicked()), this, SLOT(findCustomer()));

}