本文详细介绍了Eclipse SWT库中的StructuredViewer、ListViewer及TableViewer等控件的使用方法与API，包括如何设置标签提供者、内容提供者、排序器等，并提供了具体的代码示例。
5.1.5. StructuredViewerStructuredViewer æ¯å表æ¥çå¨ï¼è¡¨æ ¼æ¥çå¨ï¼æ æ¥çå¨çæ½è±¡è¶ç±»ã(åè§Figure 5-7) Figure 5-7. StructuredViewer å±æ¬¡å¾ä¸å为é常使ç¨çAPIï¼
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5.1.6. ListViewerListViewerç±» å°è£äºList æ§ä»¶ï¼å¯ä»¥ç¨æ¥æ¾ç¤ºå¯¹è±¡éåèä¸æ¯å符串éåãå表æ¥çå¨éè¦è®¾ç½®æ ç¾ä¾ç»å¨åå容ä¾ç»å¨ã常ç¨APIåæ¬:ä¸é¢çå对象å°ç¨å¨ä»¥åçç¨åºä¾åä¸ã public class Person {
public String firstName = "John";
public String lastName = "Doe";
public int age = 37;
public Person[] children = new Person[0];
public Person parent = null;
public Person(String firstName, String lastName,
int age) {
this.firstName = firstName;
this.lastName = lastName;
this.age = age;
}
public Person(String firstName, String lastName,
int age, Person[] children) {
this(firstName, lastName, age);
this.children = children;
for (int i = 0; i < children.length; i++) {
children[i].parent = this;
}
}
public static Person[] example() {
return new Person[] {
new Person("Dan", "Rubel", 41, new Person[] {
new Person("Beth", "Rubel", 11),
new Person("David", "Rubel", 6)}),
new Person("Eric", "Clayberg", 42, new Person[] {
new Person("Lauren", "Clayberg", 9),
new Person("Lee", "Clayberg", 7)}),
new Person("Mike", "Taylor", 55)
};
}
public String toString() {
return firstName + " " + lastName;
}
}
ä¸é¢çä¾åå建äºä¸ä¸ªå表æ¥çå¨ï¼å¹¶è®¾ç½®äºæ ç¾ä¾ç»å¨ï¼å容ä¾ç»å¨åæåºå¨ã (åè§ Figure 5-8) 注æ: è¦ç¬ç«è¿è¡æ¤ç¨åº, ä½ å¿é¡»æ·»å å¦ä¸å项å°ä½ çJava Build Path (æ件çæ¬å·è¦ç¬¦åå®è£çEclipse)ã ECLIPSE_HOME/plugins/org.eclipse.core.runtime_3.1.2.jar ECLIPSE_HOME/plugins/org.eclipse.jface_3.1.1.jar ECLIPSE_HOME/plugins/org.eclipse.jface.text_3.1.2.jar ECLIPSE_HOME/plugins/org.eclipse.text_3.1.1.jar import org.eclipse.jface.viewers.*;
import org.eclipse.swt.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class ListViewerExample {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("List Viewer Example");
shell.setBounds(100, 100, 200, 100);
shell.setLayout(new FillLayout());
final ListViewer listViewer =
new ListViewer(shell, SWT.SINGLE);
listViewer.setLabelProvider(
new PersonListLabelProvider());
listViewer.setContentProvider(
new ArrayContentProvider());
listViewer.setInput(Person.example());
listViewer.setSorter(new ViewerSorter() {
public int compare(
Viewer viewer, Object p1, Object p2) {
return ((Person) p1).lastName
.compareToIgnoreCase(((Person) p2).lastName);
}
});
listViewer.addSelectionChangedListener(
new ISelectionChangedListener() {
public void selectionChanged(
SelectionChangedEvent event) {
IStructuredSelection selection =
(IStructuredSelection) event.getSelection();
System.out.println("Selected: "
+ selection.getFirstElement());
}
});
listViewer.addDoubleClickListener(
new IDoubleClickListener() {
public void doubleClick(DoubleClickEvent event)
{
IStructuredSelection selection =
(IStructuredSelection) event.getSelection();
System.out.println("Double Clicked: " +
selection.getFirstElement());
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
}
Figure 5-8. ListViewer example.å表æ¥çå¨å建åï¼ä½¿ç¨ setLabelProvider() æ¹æ³è®¾ç½®æ ç¾ä¾ç»å¨ï¼ä½¿ç¨setContentProvider() 设置å容ä¾ç»å¨ã PersonListLabelProviderä½ä¸ºå容ä¾ç»å¨, è¿åç±ååç»æçæåæ ç¾ï¼æ²¡æè¿åå¾æ ã该类ç¨åºå¦ä¸: public class PersonListLabelProvider extends LabelProvider {
public Image getImage(Object element) {
return null;
}
public String getText(Object element) {
Person person = (Person) element;
return person.firstName + " " + person.lastName;
}
}
使ç¨å建ç ArrayContentProvideræ为å容ä¾ç»å¨ï¼å®å°è¾å¥çéåæ å°ä¸ºæ°ç»ãä½¿ç¨ setInput() æ¹æ³è®¾ç½®è¾å¥æ°æ®ãæåºå¨å®ä¹äºcompare()æ¹æ³ï¼å®åºäºååè¿è¡æåºãæåï¼ä¸ºå表æ¥çå¨æ·»å äºselectionChanged çå¬å¨ådoubleClickçå¬å¨ã |
5.1.7. TableViewerTableViewer ç±»å°è£äºTableæ§ä»¶ãè¡¨æ ¼æ¥çå¨æä¾äºå¯ç¼è¾çï¼åç´çï¼å¤åçæ¡ç®å表ãå¨å表ä¸ï¼æ¯ä¸ä¸ªæ¡ç®æ¾ç¤ºä¸ºä¸è¡ååæ ¼ãæ¯ä¸ä¸ªååæ ¼æ¾ç¤ºäºæ¡ç®çç¸åºå±æ§ãè¡¨æ ¼æ¥çå¨éè¦éç½®æ ç¾ä¾ç»å¨ï¼å容ä¾ç»å¨ååä¿¡æ¯ã CheckboxTableViewer å å¥äºå¯¹ä¸ªå«æ¡ç®æ³ç°çæ¯æï¼è¿å¯ä»¥éä¸ååéä¸æ¡ç®ç¸å³èçå¤éæ¡ã常ç¨çAPIåæ¬:The CheckboxTableViewer 常ç¨APIåæ¬: ä¸é¢çç¨åºæ ·ä¾å建ä¸ä¸ªæ¥æååçè¡¨æ ¼æ¥çå¨ã (åè§Figure 5-9)ã Figure 5-9. TableViewer æ ·ä¾import org.eclipse.jface.viewers.*;
import org.eclipse.swt.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class TableViewerExample {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("Table Viewer Example");
shell.setBounds(100, 100, 325, 200);
shell.setLayout(new FillLayout());
final TableViewer tableViewer = new TableViewer(
shell, SWT.SINGLE | SWT.FULL_SELECTION);
final Table table = tableViewer.getTable();
table.setHeaderVisible(true);
table.setLinesVisible(true);
String[] columnNames = new String[] {
"First Name", "Last Name", "Age", "Num Children"};
int[] columnWidths = new int[] {
100, 100, 35, 75};
int[] columnAlignments = new int[] {
SWT.LEFT, SWT.LEFT, SWT.CENTER, SWT.CENTER};
for (int i = 0; i < columnNames.length; i++) {
TableColumn tableColumn =
new TableColumn(table, columnAlignments[i]);
tableColumn.setText(columnNames[i]);
tableColumn.setWidth(columnWidths[i]);
}
tableViewer.setLabelProvider(
new PersonTableLabelProvider());
tableViewer.setContentProvider(
new ArrayContentProvider());
tableViewer.setInput(Person.example());
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
}
åå»ºè¡¨æ ¼æ¥çå¨åï¼è°ç¨setHeaderVisible() å setLinesVisible() æ¹æ³ä½¿å表头å¯è§ï¼è¡¨æ ¼çº¿å¯è§ãç¶åå å¥ååçä¿¡æ¯ãéè¿setText() å setWidth() æ¹æ³è®¾ç½®å表头çæåå宽度ã(åè§ 7.8 è, èªå¨è°æ´è¡¨æ ¼å)ã ä½¿ç¨ setLabelProvider()æ¹æ³è®¾ç½®æ ç¾ä¾ç»å¨ï¼ 使ç¨setContentProvider() æ¹æ³è®¾ç½®å容ä¾ç»å¨ãæ ç¾ä¾ç»å¨PersonTableLabelProvider, ç¨æ¥è¿åè¡¨æ ¼æ¯ä¸åçæåæ ç¾ï¼æ²¡æè¿åå¾æ ã ç¨åºå¦ä¸: import org.eclipse.jface.viewers.*;
import org.eclipse.swt.graphics.*;
public class PersonTableLabelProvider
extends LabelProvider
implements ITableLabelProvider {
public Image getColumnImage(
Object element, int) {
return null;
}
public String getColumnText(Object element, int index) {
Person person = (Person) element;
switch (index) {
case 0 :
return person.firstName;
case 1 :
return person.lastName;
case 2 :
return Integer.toString(person.age);
case 3 :
return Integer.toString(person.children.length);
default :
return "unknown " + index;
}
}
}
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