First , The nomal composite is very different from the Table Viewer and Tree Viewer.
The Table viewer and Tree Viewer only need add the SWT.H_SCROLL and SWT.V_SCROLL into the Constructor. The context will be move with scroll bar.
This is because the viewer has been include the scrollabled composite.
So . nomal composite should implment the scrollableComposte by ourself.
1. Set parent compsoite's layout as FillLayout.
parentComposite.setLayout(new FillLayout());
ScrolledComposite scrolledComposite = new ScrolledComposite(parentComposite, SWT.H_SCROLL|SWT.V_SCROLL);
2. Create the main composite and use the scrolled Composite as it's father.
Composite mainComposite = new Composite(scrolledComposite,SWT.NONE);
3. Set scrolled composite can controll the main composite.
scrolledComposite.setContent(mainComposite);
mainComposite.setBackground(Display.getCurrent().getSystemColor (SWT.COLOR_WHITE));// White color
mainComposite.setLayout(new GridLayout(1,true));
GridData data = new GridData(GridData.FILL_BOTH);
mainComposite.setLayoutData(data);
4. Set the other attributes.
scrolledComposite.setExpandHorizontal(true);
scrolledComposite.setExpandVertical(true);
scrolledComposite.setMinWidth(800);
scrolledComposite.setMinHeight(400);
总结:
1)在为Composite添加滚动条时,最上面的Composite的布局需设为FillLayout();
2) 不要直接往scrolledComposite上面添加控件;
3) 在创建完ScrolledComposite后不要忘记使用setContent()方法去设置滚动条所控制的Composite;
4) 最重要的是,Scrolledcomposite的以下四个参数必须设置才能出现滚动条:
scrolledComposite.setExpandHorizontal(true);
scrolledComposite.setExpandVertical(true);
scrolledComposite.setMinWidth(800);
scrolledComposite.setMinHeight(400);
只有前两项设为true之后,后面的两项才起作用。
5) 对于setMinWidth()和setMinHeight()方法,API的注释中是说用来设置滚动条出现的最小宽度和高度,但是我试了一下,有时出现滚动条了,
但是拖动滚动条还是不能显示Composite里面的全部内容,于是把setMinWidth()和setMinHeight()设大一些就可以了,个人感觉滚动条出现的
宽度和高度检测Scrolledcomposite自己已经实现了,这里的宽度和高度是指拖动滚动条里可以看到的Composite的最大宽度和最大高度。
posted on 2009-03-20 16:37
Daniel 阅读(375)
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