如何动态地将swt小部件添加到组合中? [英] how to dynamically add swt widgets to a composite?
本文介绍了如何动态地将swt小部件添加到组合中?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图在单击按钮时将诸如文本框，按钮之类的小部件添加到组合中. 我已经尝试过了，但是我只能动态地添加这些小部件，最多不超过组合的大小.我的jface对话框是这样的，它具有滚动的合成文件，其中包含一个合成文件.在主要复合材料中，我必须实现其他3种复合材料 功能，因此，如果我将动态窗口小部件添加到组合中，它可能会扩展，但不应将现有的窗口小部件向下重叠，而是应相应地调整其他组合，并且我也应该能够在单击按钮时将这些窗口小部件放置.有没有人尝试过这种动态添加和删除小部件的方法，我是swt jface的新手.因此，任何人都可以在这里分享他们的经验，我正在发布我尝试过的代码.
I'm trying to add widgets like text boxes, buttons to a composite on click of a button. I've tried , but i could only add these widgets dynamically only up to the size of the composite. My jface dialog is such that, it has a scrolled composite in which it holds a composite. In the main composite i have 3 other composites where i have to achieve this functionality, so if i add dynamic widgets to a composite it might expand, but it should not overlap existing composites down to it, rather it should adjust other composites accordingly and also i should be able to dispose those widgets on a button click. Did any one try this dynamic addition and removal of widgets before, I'm new to swt, jface . So, could any one share their experience here, I'm posting the code i've tried.
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
public class DynamicDialog extends Dialog {
private Text text;
private Text text_1;
private Composite composite;
/**
* Create the dialog.
* @param parentShell
*/
public DynamicDialog(Shell parentShell) {
super(parentShell);
}
/**
* Create contents of the dialog.
* @param parent
*/
@Override
protected Control createDialogArea(Composite parent) {
Composite container = (Composite) super.createDialogArea(parent);
container.setLayout(new FillLayout(SWT.HORIZONTAL));
ScrolledComposite scrolledComposite = new ScrolledComposite(container, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
scrolledComposite.setExpandHorizontal(true);
scrolledComposite.setExpandVertical(true);
composite = new Composite(scrolledComposite, SWT.NONE);
composite.setLayout(new FormLayout());
scrolledComposite.setContent(composite);
scrolledComposite.setMinSize(composite.computeSize(SWT.DEFAULT, SWT.DEFAULT));
final Composite composite_1 = new Composite(composite, SWT.NONE);
composite_1.setLayout(new GridLayout(4, false));
final FormData fd_composite_1 = new FormData();
fd_composite_1.top = new FormAttachment(0);
fd_composite_1.left = new FormAttachment(0, 10);
fd_composite_1.bottom = new FormAttachment(0, 85);
fd_composite_1.right = new FormAttachment(0, 430);
composite_1.setLayoutData(fd_composite_1);
Label label = new Label(composite_1, SWT.NONE);
label.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));
label.setText("1");
text_1 = new Text(composite_1, SWT.BORDER);
text_1.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
text = new Text(composite_1, SWT.BORDER);
text.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
Button btnDelete = new Button(composite_1, SWT.NONE);
btnDelete.setText("delete");
final Composite composite_2 = new Composite(composite, SWT.NONE);
composite_2.setLayout(new GridLayout(2, false));
final FormData fd_composite_2 = new FormData();
fd_composite_2.bottom = new FormAttachment(100, -91);
fd_composite_2.top = new FormAttachment(0, 91);
fd_composite_2.right = new FormAttachment(100, -10);
fd_composite_2.left = new FormAttachment(100, -74);
composite_2.setLayoutData(fd_composite_2);
new Label(composite_2, SWT.NONE);
Button btnAdd = new Button(composite_2, SWT.NONE);
btnAdd.setText("ADD");
btnAdd.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
Label label2 = new Label(composite_1, SWT.NONE);
label2.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));
label2.setText("1");
Text text_12 = new Text(composite_1, SWT.BORDER);
text_12.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
Text text13 = new Text(composite_1, SWT.BORDER);
text13.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
Button btnDelete = new Button(composite_1, SWT.NONE);
btnDelete.setText("delete");
//Point p0 = composite_1.getSize();
//composite_1.setSize(SWT.DEFAULT,SWT.DEFAULT);
composite_1.layout();
//Point p = composite.getSize();
//composite.setSize(SWT.DEFAULT,SWT.DEFAULT);
//composite.setSize(p);
// composite.layout();
}
});
return container;
}
/**
* Create contents of the button bar.
* @param parent
*/
@Override
protected void createButtonsForButtonBar(Composite parent) {
createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL,
true);
createButton(parent, IDialogConstants.CANCEL_ID,
IDialogConstants.CANCEL_LABEL, false);
}
/**
* Return the initial size of the dialog.
*/
@Override
protected Point getInitialSize() {
return new Point(450, 300);
}
public static void main(String[] args){
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
DynamicDialog dd = new DynamicDialog(shell);
dd.open();
}
}
推荐答案
解决此问题的方法是，每次添加/删除小部件时都设置ScrolledComposite的最小大小.您将使用ScrolledComposite中的setMinSize(Point) API.另外，请记住layout()滚动的合成，而不是其子元素.放置孩子会自动完成.
The solution to your problem is to set the minimum size of the ScrolledComposite each time you add/remove a widget. You will use setMinSize(Point) API from ScrolledComposite. Also, remember to layout() the scrolled composite, and not its children. The laying of children will be done automatically.
添加按钮当前与每个新添加的组件一起移动.如果您希望它不移动，只需将其移动到滚动的复合内容之外.
The add button currently moves along with each newly added component. If you want it to not move, just move it outside the scrolled composite content.
此外，我已经整理了一下代码，希望您不要介意. :-)
Also, I've cleaned up your code a little bit, I hope you don't mind. :-)
public class DynamicDialog extends Dialog
{
private int count = 1;
public DynamicDialog(final Shell parent)
{
super(parent);
}
@Override
protected Control createDialogArea(final Composite parent)
{
final Composite container = (Composite) super.createDialogArea(parent);
container.setLayout(new FillLayout());
final ScrolledComposite scrolledComposite = new ScrolledComposite(container, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
scrolledComposite.setExpandHorizontal(true);
scrolledComposite.setExpandVertical(true);
final Composite composite = new Composite(scrolledComposite, SWT.NONE);
composite.setLayout(new GridLayout(1, false));
scrolledComposite.setContent(composite);
scrolledComposite.setSize(composite.computeSize(SWT.DEFAULT, SWT.DEFAULT));
final Composite composite_1 = new Composite(composite, SWT.NONE);
composite_1.setLayout(new GridLayout(2, false));
composite_1.setLayoutData(new GridData(SWT.LEFT, SWT.CENTER, false, false));
final Label lblDefault = new Label(composite_1, SWT.NONE);
lblDefault.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));
lblDefault.setText("Default:");
final Combo combo = new Combo(composite_1, SWT.NONE);
combo.setLayoutData(new GridData(SWT.LEFT, SWT.CENTER, true, false, 1, 1));
final Composite composite_2 = new Composite(composite, SWT.NONE);
composite_2.setLayout(new GridLayout(4, false));
composite_2.setLayoutData(new GridData(SWT.LEFT, SWT.CENTER, false, false));
final Composite composite_3 = new Composite(composite, SWT.NONE);
composite_3.setLayout(new GridLayout());
composite_3.setLayoutData(new GridData(SWT.LEFT, SWT.CENTER, false, false));
final Button btnAdd = new Button(composite_3, SWT.NONE);
btnAdd.setText("Add");
btnAdd.addSelectionListener(new SelectionAdapter()
{
@Override public void widgetSelected(final SelectionEvent e)
{
final Label label2 = new Label(composite_2, SWT.NONE);
label2.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));
label2.setText( String.valueOf(count++) );
new Text(composite_2, SWT.BORDER).setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
new Text(composite_2, SWT.BORDER).setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
new Button(composite_2, SWT.NONE).setText("Delete");
// DO THIS:
scrolledComposite.layout(true, true);
scrolledComposite.setMinSize(composite.computeSize(SWT.DEFAULT, SWT.DEFAULT));
// .. and it will work
}
});
return container;
}
@Override
protected void createButtonsForButtonBar(final Composite parent)
{
createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true);
createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false);
}
/**
* Return the initial size of the dialog.
*/
@Override
protected Point getInitialSize()
{
return new Point(450, 300);
}
public static void main(final String[] args)
{
final Shell shell = new Shell(new Display());
shell.setLayout(new FillLayout());
new DynamicDialog(shell).open();
}
}
这篇关于如何动态地将swt小部件添加到组合中?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
