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);
總結(jié):
1)在為Composite添加滾動(dòng)條時(shí),最上面的Composite的布局需設(shè)為FillLayout();
2) 不要直接往scrolledComposite上面添加控件;
3) 在創(chuàng)建完ScrolledComposite后不要忘記使用setContent()方法去設(shè)置滾動(dòng)條所控制的Composite;
4) 最重要的是,Scrolledcomposite的以下四個(gè)參數(shù)必須設(shè)置才能出現(xiàn)滾動(dòng)條:
scrolledComposite.setExpandHorizontal(true);
scrolledComposite.setExpandVertical(true);
scrolledComposite.setMinWidth(800);
scrolledComposite.setMinHeight(400);
只有前兩項(xiàng)設(shè)為true之后,后面的兩項(xiàng)才起作用。
5) 對(duì)于setMinWidth()和setMinHeight()方法,API的注釋中是說用來設(shè)置滾動(dòng)條出現(xiàn)的最小寬度和高度,但是我試了一下,有時(shí)出現(xiàn)滾動(dòng)條了,
但是拖動(dòng)滾動(dòng)條還是不能顯示Composite里面的全部?jī)?nèi)容,于是把setMinWidth()和setMinHeight()設(shè)大一些就可以了,個(gè)人感覺滾動(dòng)條出現(xiàn)的
寬度和高度檢測(cè)Scrolledcomposite自己已經(jīng)實(shí)現(xiàn)了,這里的寬度和高度是指拖動(dòng)滾動(dòng)條里可以看到的Composite的最大寬度和最大高度。
posted on 2009-03-20 16:37
Daniel 閱讀(381)
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