滚动窗格到图答案

【问题标题】：scrollpane to the figure滚动窗格到图
【发布时间】：2012-07-22 22:15:04
【问题描述】：

我想在 RoundedRectangle 中添加一个滚动条。我在根图中有 3 个圆角矩形。现在我想为每个圆角矩形添加滚动条。是否有可能将滚动条添加到圆角矩形或矩形图形？我使用了以下方式。但它没有向我显示任何数字。如何让它发挥作用？在下面的示例中，我只添加了一个矩形。

import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.Figure;
import org.eclipse.draw2d.FigureCanvas;
import org.eclipse.draw2d.LightweightSystem;
import org.eclipse.draw2d.RoundedRectangle;
import org.eclipse.draw2d.ScrollPane;
import org.eclipse.draw2d.XYLayout;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class RoundedRectangleTest {

    public static void main(String args[]) {

        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());
        shell.setText("Scrollpane Example");

        // Create a root figure and simple layout to contain all other figures
        Figure root = new Figure();
        root.setFont(shell.getFont());
        root.setLayoutManager(new XYLayout());

        ScrollPane scrollPane = new ScrollPane();

        RoundedRectangle r = new RoundedRectangle();
        r.setBackgroundColor(ColorConstants.yellow);
        Rectangle rect = new Rectangle(10, 10, 50, 50);
        r.setBounds(rect);

        scrollPane.setContents(r);

        root.add(scrollPane);

        FigureCanvas canvas = new FigureCanvas(shell, SWT.DOUBLE_BUFFERED);
        canvas.setBackground(ColorConstants.white);
        //canvas.setContents(scrollPane);
        LightweightSystem lws = new LightweightSystem(canvas);
        lws.setContents(root);

        shell.setSize(400, 350);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        display.dispose();

    }

}

【问题讨论】：

标签： java swt draw2d

【解决方案1】：

我没有设法得到圆角矩形，但以下至少适用于常规矩形：

public class RoundedRectangleTest {
    public static void main(String args[]) {
        Display d = Display.getDefault();
        final Shell shell = new Shell(d);

        LightweightSystem lws = new LightweightSystem(shell);
        final Figure contents = new Figure();
        lws.setContents(contents);
        contents.setLayoutManager(new GridLayout());

        IFigure rectangleFigure = createFigure();
        ScrollPane pane = new ScrollPane();

        /* delete following two lines if scrollbars not always visible */
        pane.setHorizontalScrollBarVisibility(ScrollPane.ALWAYS);
        pane.setVerticalScrollBarVisibility(ScrollPane.ALWAYS);
        pane.setContents(rectangleFigure);
        contents.add(pane);

        shell.open();
        shell.setText("Scrollpane Example");
        while (!shell.isDisposed()) {
            if (!d.readAndDispatch())
                d.sleep();
        }
    }

    private static IFigure createFigure() {
        RectangleFigure rectangleFigure = new RectangleFigure();
        rectangleFigure.setBackgroundColor(ColorConstants.yellow);
        rectangleFigure.setSize(100, 100);
        return rectangleFigure;
    }
}

也许您可以以此为起点，创建一个类似于RectangleFigure 的Figure，但带有圆角。

【讨论】：