SWT之ScrolledComposite

太过爱你忘了你带给我的痛 2022-07-15 08:37 143阅读 0赞

毕设中用到Composite的滚动效果，在网上搜到原来SWT有ScrolledComposite，用之。

import org.eclipse.swt.SWT; import org.eclipse.swt.custom.ScrolledComposite; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; public class ss \{ public static void main(String\[\] args) \{ Display display = new Display(); Color red = display.getSystemColor(SWT.COLOR\_RED); Color blue = display.getSystemColor(SWT.COLOR\_BLUE); Shell shell = new Shell(display); shell.setLayout(new FillLayout()); // set the size of the scrolled content - method 1 final ScrolledComposite sc1 = new ScrolledComposite(shell, SWT.H\_SCROLL | SWT.V\_SCROLL | SWT.BORDER); final Composite c1 = new Composite(sc1, SWT.NONE); sc1.setContent(c1); c1.setBackground(red); GridLayout layout = new GridLayout(); layout.numColumns = 4; c1.setLayout(layout); Button b1 = new Button(c1, SWT.PUSH); b1.setText("first button"); /\* \* 这是两种用法中的一种，效果是：根据已经存在的组件，计算需要的composite的区域的大小 \* 即运行结果中红色显示的部分。 \*/ c1.setSize(c1.computeSize(SWT.DEFAULT, SWT.DEFAULT)); // set the minimum width and height of the scrolled content - method 2 final ScrolledComposite sc2 = new ScrolledComposite(shell, SWT.H\_SCROLL | SWT.V\_SCROLL | SWT.BORDER); sc2.setExpandHorizontal(true); sc2.setExpandVertical(true); final Composite c2 = new Composite(sc2, SWT.NONE); sc2.setContent(c2); c2.setBackground(blue); layout = new GridLayout(); layout.numColumns = 4; c2.setLayout(layout); Button b2 = new Button(c2, SWT.PUSH); b2.setText("first button"); /\* \* 这是第二种用法，整个composite区域是用到的Composite区域 \*/ sc2.setMinSize(c2.computeSize(SWT.DEFAULT, SWT.DEFAULT)); Button add = new Button(shell, SWT.PUSH); add.setText("add children"); final int\[\] index = new int\[\] \{ 0 \}; add.addListener(SWT.Selection, new Listener() \{ public void handleEvent(Event e) \{ index\[0\]++; Button button = new Button(c1, SWT.PUSH); button.setText("button " + index\[0\]); // reset size of content so children can be seen - method 1 c1.setSize(c1.computeSize(SWT.DEFAULT, SWT.DEFAULT)); c1.layout(); button = new Button(c2, SWT.PUSH); button.setText("button " + index\[0\]); // reset the minimum width and height so children can be seen - // method 2 sc2.setMinSize(c2.computeSize(SWT.DEFAULT, SWT.DEFAULT)); c2.layout(); \} \}); shell.open(); while (!shell.isDisposed()) \{ if (!display.readAndDispatch()) display.sleep(); \} display.dispose(); \} \}