Windows7似乎破坏了SWT控件。打印(gc)

已在SWT中归档并修复了一个错误(非常快): https://bugs.eclipse.org/bugs/show_bug.cgi?id=305294

首先,我的目标是将这两个图像打印到画布上,这样我就可以动画画布在屏幕上滑动(想想iphone),滑动控件本身太占用CPU,所以这是一个很好的选择,直到我在win7上测试它。我愿意接受任何有助于我解决原始问题的方法,而不必解决下面的问题。

有人知道如何让“control.print(gc)”使用Windows7Aero吗?当禁用Aero时,我的代码在Windows XP和Windows 7中工作正常,但命令:

打印(GC)使非顶端控件从屏幕上有效删除。

GC gc = new GC(image);
try {
    // As soon as this code is called, calling "layout" on the controls
    // causes them to disappear.
    control.print(gc);
} finally {
    gc.dispose();
}

我有堆叠的控件,希望打印当前和下一个控件中的图像,以便我可以将它们从屏幕上“滑动”出来。但是,在打印非顶部控件时,它将不再重新绘制。

下面是一些示例代码。(有趣的代码位位于顶部,需要指向SWT才能工作。)

谢谢你的帮助。为了解决这个问题,我正在考虑在打印件之间交换控件,看看是否有帮助,但我宁愿不这样做。

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StackLayout;
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.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

public class SWTImagePrintTest {
    private Composite stack;
    private StackLayout layout;
    private Label lblFlip;
    private Label lblFlop;
    private boolean flip = true;
    private Button buttonFlop;
    private Button buttonPrint;

    /**
     * Prints the control into an image
     * 
     * @param control
     */
    protected void print(Control control) {
        Image image = new Image(control.getDisplay(), control.getBounds());
        GC gc = new GC(image);
        try {
            // As soon as this code is called, calling "layout" on the controls
            // causes them to disappear.
            control.print(gc);
        } finally {
            gc.dispose();
        }
    }

    /**
     * Swaps the controls in the stack
     */
    private void flipFlop() {
        if (flip) {
            flip = false;
            layout.topControl = lblFlop;
            buttonFlop.setText("flop");
            stack.layout();
        } else {
            flip = true;
            layout.topControl = lblFlip;
            buttonFlop.setText("flip");
            stack.layout();
        }
    }

    private void createContents(Shell shell) {
        shell.setLayout(new GridLayout(2, true));
        stack = new Composite(shell, SWT.NONE);
        GridData gdStack = new GridData(GridData.FILL_BOTH);
        gdStack.horizontalSpan = 2;
        stack.setLayoutData(gdStack);
        layout = new StackLayout();
        stack.setLayout(layout);
        lblFlip = new Label(stack, SWT.BOLD);
        lblFlip.setBackground(Display.getCurrent().getSystemColor(
                SWT.COLOR_CYAN));
        lblFlip.setText("FlIp");
        lblFlop = new Label(stack, SWT.NONE);
        lblFlop.setBackground(Display.getCurrent().getSystemColor(
                SWT.COLOR_BLUE));
        lblFlop.setText("fLoP");
        layout.topControl = lblFlip;
        stack.layout();
        buttonFlop = new Button(shell, SWT.FLAT);
        buttonFlop.setText("Flip");
        GridData gdFlip = new GridData();
        gdFlip.horizontalAlignment = SWT.RIGHT;
        buttonFlop.setLayoutData(gdFlip);
        buttonFlop.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                flipFlop();
            }

        });
        buttonPrint = new Button(shell, SWT.FLAT);
        buttonPrint.setText("Print");
        GridData gdPrint = new GridData();
        gdPrint.horizontalAlignment = SWT.LEFT;
        buttonPrint.setLayoutData(gdPrint);
        buttonPrint.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                print(lblFlip);
                print(lblFlop);
            }
        });

    }


    /**
     * @param args
     */
    public static void main(String[] args) {
        Shell shell = new Shell();
        shell.setText("Slider Test");
        shell.setSize(new Point(800, 600));
        shell.setLayout(new GridLayout());
        SWTImagePrintTest tt = new SWTImagePrintTest();
        tt.createContents(shell);
        shell.open();
        Display display = Display.getDefault();
        while (shell.isDisposed() == false) {
            if (display.readAndDispatch() == false) {
                display.sleep();
            }
        }
        display.dispose();
    }
}