SWT List Demo

要实现的就是上面这个东东！

功能：

1.多选左右两个 list 移动（选定移动、所有移动）；

2.右边list 的上下移动；

 

package com.fox.list; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.List; import org.eclipse.swt.widgets.Shell; public class ListDemo extends Shell { private List to; private List from; /** * Launch the application * @param args */ public static void main(String args[]) { try { Display display = Display.getDefault(); ListDemo shell = new ListDemo(display, SWT.SHELL_TRIM); shell.open(); shell.layout(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } } catch (Exception e) { e.printStackTrace(); } } /** * Create the shell * @param display * @param style */ public ListDemo(Display display, int style) { super(display, style); createContents(); } /** * Create contents of the window */ protected void createContents() { setText("List Demo"); setSize(500, 375); String[] form_ = new String[20]; String[] to_ = new String[0]; for (int i = 0; i < form_.length; i++) { form_[i] = "item_" + i ; } from = new List(this, SWT.V_SCROLL | SWT.MULTI | SWT.BORDER); from.setBounds(24, 10, 176, 204); from.setItems(form_); from.setToolTipText("From"); to = new List(this, SWT.BORDER | SWT.MULTI | SWT.BORDER); to.setBounds(284, 10, 176, 204); to.setItems(to_ ); to.setToolTipText("To"); // SelectionAdapter listener = new SelectionAdapter() { public void widgetSelected(SelectionEvent e){ Button selected = (Button) e.widget; //通过widget上的text进行匹配。 if(selected.getText().equalsIgnoreCase("<")){ move(to.getSelection(), to, from); }else if(selected.getText().equalsIgnoreCase("<<")){ move(to.getItems(), to, from); }else if(selected.getText().equalsIgnoreCase(">")){ move(from.getSelection(), from, to); }else if(selected.getText().equalsIgnoreCase(">>")){ move(from.getItems(), from, to); }else if(selected.getText().equalsIgnoreCase("^")){ int index = to.getSelectionIndex(); if(index <= 0){ return; }else{ String currentValue = to.getItem(index); to.setItem(index, to.getItem(index - 1)); to.setItem(index-1, currentValue); to.setSelection(index-1); } }else if(selected.getText().equalsIgnoreCase("v")){ int index = to.getSelectionIndex(); if(index >= to.getItemCount()-1){ return; }else{ String currentValue = to.getItem(index); to.setItem(index, to.getItem(index + 1)); to.setItem(index+1, currentValue); to.setSelection(index+1); } } } public void move(String[] items, List from , List to ){ for (int i = 0; i < items.length; i++) { from.remove(items[i]); to.add(items[i]); } } }; final Button lb = new Button(this, SWT.NONE); lb.setText("<"); lb.setBounds(215, 15, 50, 27); lb.addSelectionListener(listener); final Button llb = new Button(this, SWT.NONE); llb.setBounds(215, 67, 50, 27); llb.setText("<<"); llb.addSelectionListener(listener); final Button rb = new Button(this, SWT.NONE); rb.setBounds(215, 119, 50, 27); rb.setText(">"); rb.addSelectionListener(listener); final Button rrb = new Button(this, SWT.NONE); rrb.setBounds(215, 171, 50, 27); rrb.setText(">>"); rrb.addSelectionListener(listener); final Button button = new Button(this, SWT.NONE); button.setText("^"); button.setBounds(394, 220, 30, 27); button.addSelectionListener(listener); final Button vButton = new Button(this, SWT.DOWN); vButton.setBounds(430, 220, 30, 27); vButton.setText("v"); vButton.addSelectionListener(listener); // } @Override protected void checkSubclass() { // Disable the check that prevents subclassing of SWT components } }

 

说明：

1.用SWT designer 实现起来比较简单。

2.就是List的基本Api实现，主要用到：

*向列表框中添加选项：

add(String  string, int index)

setItem(int index, String string)

*删除列表框中选项：

remove(int index)

remove(int[] indices)

remove(int start, int end)

remove(String string)

removeAll()

*获得列表框的状态：

getItem(int index)

getItemCount()

getItems()-->String[]

indexOf(String string)

*获得列表框中被选中的选项的信息：

getSelection()-->String[]

getSelectionCount()

getSelectionIndex()

getSelectionIndices()-->int[]

isSelected(int index)

setSelection(int index)

setSelection(int[] indices)

selectAll()

setSelection(String[] items)

deselect(int index)

...

详细信息参见SWT_Api。