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)