BenchmarkTextPackage (figureCanvas) sample 【输入改变figure】

使用Swing创建文本绘制应用

最新推荐文章于 2025-03-08 17:39:10 发布

原创最新推荐文章于 2025-03-08 17:39:10 发布 · 205 阅读

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本文介绍如何使用Swing库中的SwingUtilities类来获取文本的尺寸，并通过自定义类实现文本绘制功能，最终创建一个可以动态更新并显示文本的应用程序。

public class BenchmarkTextPackage {

    static class StyledLine extends Figure {
        Dimension pref;
        private String text;

        public Dimension getPreferredSize(int wHint, int hHint) {
            if (pref == null)
                pref = FigureUtilities.getTextExtents(text, getFont());
            return pref;
        }

        protected void paintFigure(Graphics graphics) {
            graphics.setFont(getFont());
            graphics.drawText(text, bounds.x, bounds.y);
        }

        public void setText(String text) {
            this.text = text;
            pref = null;
            revalidate();
        }
        public String getText() {
            return text;
        }
    }

    static Font BIG = new Font(null, "Times", 18, SWT.BOLD);
    static StyledLine typing;

    public static void main(String[] args) {
        final Display display = Display.getDefault();
        final Shell shell = new Shell(SWT.SHELL_TRIM);
        shell.setLayout(new FillLayout());

        //ImageData data = new ImageData(StyleLines.class.getResourceAsStream("class.gif"));
        //	final Image image = new Image(null, data, data.getTransparencyMask());

        FigureCanvas canvas = new FigureCanvas(shell);

        Figure page = new Figure();
        ToolbarLayout layout = new ToolbarLayout();
//        layout.setStretchMinorAxis(false);
//        layout.setMinorAlignment(ToolbarLayout.ALIGN_TOPLEFT);
        page.setLayoutManager(layout);

        for (int i = 0; i < 50; i++) {
            StyledLine line = new StyledLine(); 
            if (i % 20 == 0)
                line.setFont(BIG);
            line.setText("This is line number " + i);
            if (i == 10)
                typing = line;
            page.add(line);
        }
        canvas.setContents(page);

        canvas.addKeyListener(new KeyListener() {
            public void keyPressed(KeyEvent e) {
                typing.setText(typing.getText() + e.character);
                typing.revalidate();
                typing.repaint();
            }

            public void keyReleased(KeyEvent e) {}
        });

        shell.setSize(400, 300);
        shell.open();

        while (!shell.isDisposed())
            if (!display.readAndDispatch())
                display.sleep();
    }

}