java swt shell

java swt shell

我正在研究这个可以添加和删除其他复合材料的复合画布.

我对整个布局概念仍然处于迷雾中的理解.

当子容器被添加到容器中时,考虑到容器具有填充父容器的GridData这一事实,父容器是否也应该知道子容器已调整大小？由于shell(顶级父级),因此在容器布置后,子项仍然隐藏.

如果问题太模糊,请不要犹豫,询问更多细节.另外,请尽量不要将我指向SWT文章中的“理解布局”.

/**

*

* @author ggrec

*

*/

public class SSCCE

{

// ==================== 2. Instance Fields ============================

private Composite componentContainer;

private int componentCount = 0;

// ==================== 3. Static Methods =============================

public static void main(final String[] args)

{

new SSCCE();

}

// ==================== 4. Constructors ===============================

private SSCCE()

{

final Display display = new Display();

final Shell shell = new Shell(display);

shell.setLayout(new GridLayout(1, false));

createContents(shell);

shell.pack();

shell.open();

while (!shell.isDisposed())

{

if (!adAndDispatch())

display.sleep();

}

display.dispose();

}

// ==================== 5. Creators ===================================

private void createContents(final Composite parent)

{

parent.setLayout(new GridLayout());

parent.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

final Button button = new Button(parent, SWT.PUSH);

button.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));

button.setText("Add New Component");

button.addSelectionListener(new SelectionAdapter()

{

@Override public void widgetSelected(final SelectionEvent e)

{

addNewComponent();

componentContainer.layout();

}

});

componentContainer = new Composite(parent, SWT.BORDER);

componentContainer.setLayout(new GridLayout());

componentContainer.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

}

// ==================== 6. Action Methods =============================

private void addNewComponent()

{

final Composite component = new Composite(componentContainer, SWT.BORDER);

component.setLayout(new FillLayout());

component.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));

final Label label = new Label(component, SWT.NONE);

label.setText( String.valueOf(componentCount++) );

}

}