Eclipse Form设计指南之定制布局

发表于:2007-06-11来源:作者:点击数: 标签:
Eclipse Form提供了2个新的布局,TableWrapLayout 和ColumnLayout。 (1)TableWrapLayout ·问题:如果将上例中超链接的文本设置的足够长 link.setText("This is an example of a form that is much longer and will need to wrap."); 即使设置了SWT.WRAP,

Eclipse Form提供了2个新的布局,TableWrapLayout 和ColumnLayout。

(1)TableWrapLayout

·问题:如果将上例中超链接的文本设置的足够长

link.setText("This is an example of a form that is much longer and will need to wrap.");

即使设置了SWT.WRAP,文本内容不会自动WRAP,这是因为体内容的布局是GridLayout

·Eclipse Form提供替代的布局TableWrapLayout:类似于GridLayout,但是具有象HTML表格一样自动WRAP功能

·下面是解决超链接文本自动WRAP的例子:

public void createPartControl(Composite parent) {
 toolkit = new FormToolkit(parent.getDisplay());
 form = toolkit.createScrolledForm(parent);
 form.setText("Hello, Eclipse Forms");

 Composite body = form.getBody();
 TableWrapLayout layout = new TableWrapLayout();
 body.setLayout(layout);
 HyPerlink link = toolkit.createHyperlink(body, "Click here.", SWT.WRAP);
 link.addHyperlinkListener(new HyperlinkAdapter() {
public void linkActivated(HyperlinkEvent e) {
 System.out.println("Link activated!");
}
 });

 layout.numColumns = 2;
 link.setText
  ("This is an example of a form that is much longer and will need to wrap.");
 TableWrapData td = new TableWrapData();
 td.colspan = 2;
 link.setLayoutData(td);
 Label label = toolkit.createLabel(body, "Text field label:");
 Text text = toolkit.createText(body, "");
 td = new TableWrapData(TableWrapData.FILL_GRAB);
 text.setLayoutData(td);
 text.setData(FormToolkit.KEY_DRAW_BORDER, FormToolkit.TEXT_BORDER);
 Button button = toolkit.createButton(body,
  "An example of a checkbox in a form", SWT.CHECK);
 td = new TableWrapData();
 td.colspan = 2;
 button.setLayoutData(td);
 toolkit.paintBordersFor(body);
}

·下面是程序变化的地方:

1) TableWrapLayout替代GridLayout

2) 使用TableWrapData来提供布局数据信息

3) 设置的属性使用colspan、rowspan等来源于HTML表格单元的属性

·要注意的是:需要自动WRAP的控件,需要设置成SWT.WRAP风格

(2)ColumnLayout

·ColumnLayout是Eclipse Form提供的另一个定制布局

·ColumnLayout的布局方式是从上到下,从左到右

·在变化Form的宽度时,会自动调整控件列数以适应Form的宽度

·ColumnLayout的设置很简单,通常只要设置列数的范围(缺省是1-3)

(责任编辑:铭铭)



原文转自:http://www.ltesting.net

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