面板中的居中字符串 [英] Centering String in Panel

问题描述

我试图在面板中居中一个字符串.

I'm trying to center a String in a Panel.

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
        }
}

有没有一种方法可以用来简化这个任务?

Is there a single method I can use to simplify this task?

例如:

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

似乎我做了很多工作只是为了使文本居中.

Just seems like I'm doing a lot of work just to center text.

推荐答案

在 java 标准库中?不，你总是可以在这方面做一些事情

In the java standard library? No, you can always do something along this

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
        }

与

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

这篇关于面板中的居中字符串的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！