面板中的居中字符串

Question

我正在尝试在面板中居中放置字符串。

目前，我正在这样做：

public void paintComponent(Graphics g) {
        super.paintComponent(g);
            int stringWidth = 0;
            int stringAccent = 0;
            int xCoordinate = 0;
            int yCoordinate = 0;
            // get the FontMetrics for the current font
            FontMetrics fm = g.getFontMetrics();


        /** display new message */
        if (currentMessage.equals(message1)) {
            removeAll();
            /** Centering the text */
            // find the center location to display
            stringWidth = fm.stringWidth(message2);
            stringAccent = fm.getAscent();
            // get the position of the leftmost character in the baseline
            xCoordinate = getWidth() / 2 - stringWidth / 2;
            yCoordinate = getHeight() / 2 + stringAccent / 2;

            // draw String
            g.drawString(message2, xCoordinate, yCoordinate);
            currentMessage = message2;  // alternate message
        }
}

我可以使用一种方法来简化此任务吗？

例如：

public void paintComponent(Graphics g) {
            super.paintComponent(g);
            if (currentMessage.equals(message1)) {
                removeAll();
                // draw String centered (with one line of code)
            }
}

似乎我正在做很多工作只是为了使文本居中。

Answer 1

在Java标准库中？不，您可以随时做一些事情

private void drawStringMiddleOfPanel(String string, Graphics g) {
            String message2 = string;
            int stringWidth = 0;
            int stringAccent = 0;
            int xCoordinate = 0;
            int yCoordinate = 0;
            // get the FontMetrics for the current font
            FontMetrics fm = g.getFontMetrics();


        /** display new message */
            /** Centering the text */
            // find the center location to display
            stringWidth = fm.stringWidth(message2);
            stringAccent = fm.getAscent();
            // get the position of the leftmost character in the baseline
            xCoordinate = getWidth() / 2 - stringWidth / 2;
            yCoordinate = getHeight() / 2 + stringAccent / 2;

            // draw String
            g.drawString(message2, xCoordinate, yCoordinate);
            currentMessage = message2;  // alternate message
        }

用

public void paintComponent(Graphics g) {
        super.paintComponent(g);
        if (currentMessage.equals(message1)) {
            removeAll();
            drawStringMiddleOfPanel(message1, g);
        }
 }