SWT 如何打印scrolledComposite 的内容？

有谁知道如何打印滚动复合材料的内容？

每当我打印到 GC 上时，它只会复制滚动复合材料的当前可视区域。我想要的是能够复制滚动复合的全部内容。

例如，下面的代码在一个小窗口内创建了一个巨大的按钮。当我打印下面的 gc 时，它只会输出滚动复合的小可视区域。是否可以打印滚动复合材料中的所有内容？

Shell shell = new Shell(getDisplay());
shell.setLayout(new FillLayout());
shell.setSize(200, 200);
shell.setLocation(20, 20);


ScrolledComposite sc = new ScrolledComposite(shell, SWT.H_SCROLL| SWT.V_SCROLL);
sc.setMinSize(availWidth, availHeight + 30);

Button b = new Button(sc, SWT.PUSH);
b.setText("Button");
b.setSize(availWidth, availHeight);
sc.setContent(b);

Image image = new Image(getDisplay(), availWidth, availHeight);
GC imageGC = new GC(image);
sc.print(imageGC);

Note >>>

See @CryptDemon https://stackoverflow.com/users/1332225/cryptdemon下面评论。尽管该解决方案已知可在 Windows 7 和 eclipse 3.7.x 版本上运行。

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Yes it is possible. The problem you are facing is due the way Windows paint events are generated (I am assuming Windows OS because I only have that !!) for a scrolling window.

在任何给定时刻（根据您的代码）您的可见大小scrolled composite is less比实际尺寸。现在当你打电话时print()在你的scrolled composite然后只打印其中的一部分（当时可用/可见）。像这样：

The solution就是创建一个固定的Composite在你的里面scrolled composite并致电打印。

Code:

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.ImageLoader;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class Scrolled 
{
    public static void main(String[] args)
    {
        final Display display = new Display();

        Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());
        shell.setSize(200, 200);
        shell.setLocation(20, 20);

        final ScrolledComposite sc = new ScrolledComposite(shell, SWT.BORDER  | SWT.V_SCROLL | SWT.H_SCROLL);
        sc.setLayout(new GridLayout(1,true));

        final Composite innerComposite = new Composite(sc, SWT.NONE);
        innerComposite.setSize(400, 400);
        innerComposite.setLayout(new GridLayout(1, true));

        for(int i = 0; i < 10; i++)
        {
                Button b = new Button(innerComposite, SWT.PUSH);
                b.setText("Text");
                b.addSelectionListener(new SelectionAdapter() {
                    public void widgetSelected(SelectionEvent e) 
                    {
                        Image image = new Image(display, innerComposite.getBounds().width, innerComposite.getBounds().height);
                        ImageLoader loader = new ImageLoader();

                        GC gc = new GC(image);
                        sc.print(gc);
                        gc.dispose();

                        loader.data = new ImageData[]{image.getImageData()};
                        loader.save("c:/temp/out.png", SWT.IMAGE_PNG);
                    }
                });
        }

        sc.setMinSize(innerComposite.computeSize(SWT.DEFAULT, SWT.DEFAULT));
        sc.setContent(innerComposite);
        sc.setExpandHorizontal(true);
        sc.setExpandVertical(true);


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

Output: