1
edit
Changes
→"Add Student" Command
</source>
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2. Modifying the MyStudentEditorInput class:<br/>
we will override the "equals" method to recognize if the input object to the method equals this object (EditorInput).This ensures that if you click on Add Student command several times, only one editor window will open and consequent calls to the command will only set focus on the open editor view.
<code>MyStudentEditorInput.java </code>
<source lang=java>
/ Added For NewStudent Command
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
MyStudentEditorInput other = (MyStudentEditorInput) obj;
if (id != other.id)
return false;
return true;
}
</source>
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3. Modifying the editor view (MyStudentEditor class).<br/>
Here we do the following changes:
a) make the Text objects, a member of the class, so that they can be used in other methods.
<code>MyStudentEditor.java </code>
<source lang=java>
public class MyStudentEditor extends EditorPart {
public static final String ID = "cs.ecl.rcp.simplercp.editor.studenteditor";
private Student student;
private MyStudentEditorInput input;
// Added For NewStudent Command
private Text text;
private Text text1;
private Text text2;
private Text text3;
</source>
<br/>
b) Modify the "init" method so it distinguishes between a new and existing student input object, and creates an empty student object for the input with id "0":
<code>MyStudentEditor.java </code>
<source lang=java>
public void init(IEditorSite site, IEditorInput input)
throws PartInitException {
if (!(input instanceof MyStudentEditorInput)) {
throw new RuntimeException("Wrong input");
}
MyStudentEditorInput new_name = (MyStudentEditorInput) input;
this.input = (MyStudentEditorInput) input;
setSite(site);
setInput(input);
// Added For NewStudent Command
if(this.input.getId()=="0"){
student = new Student ();
setPartName("New Student");
}
else
{
student = ModelProvider.INSTANCE.getPersonById(this.input.getId());
setPartName("Student " + student.getLastName());
}
}
</source>
<br/>
c)Modify the "createPartControl" method to 1)check if the student object properties are null to prevent referencing null when the student object is a new one. 2)To add a save button to the window with the listener. when clicked, the save button will set the text field inputs as the student property and adds the student to the ModelProvider class, then refreshes the tableViewer and closes the editor window. The save button only appears for the new student editor.<br/>
<code>MyStudentEditor.java </code>
<source lang=java>
// Modified For NewStudent Command
@Override
public void createPartControl(Composite parent) {
GridLayout layout = new GridLayout();
layout.numColumns = 2;
parent.setLayout(layout);
Label label = new Label(parent, SWT.BORDER);
label.setText("ID");
text = new Text(parent, SWT.BORDER);
if (student.getId()!=null)
text.setText(student.getId());
text.setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false));
Label label1 = new Label(parent, SWT.BORDER);
label1.setText("First Name");
text1 = new Text(parent, SWT.BORDER);
if (student.getFirstName()!=null)
text1.setText(student.getFirstName());
text1.setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false));
Label label2 = new Label(parent, SWT.BORDER);
label2.setText("Last Name");
text2 = new Text(parent, SWT.BORDER);
if (student.getLastName()!=null)
text2.setText(student.getLastName());
text2.setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false));
Label label3 = new Label(parent, SWT.BORDER);
label3.setText("Program");
text3 = new Text(parent, SWT.BORDER);
if (student.getProgram()!=null)
text3.setText(student.getProgram());
text3.setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false));
// Added For NewStudent Command
Button btnSave = new Button(parent, SWT.PUSH);
btnSave.setText("Save");
btnSave.setVisible(false);
if (this.input.getId()=="0") btnSave.setVisible(true);
btnSave.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
if (text.getText().length() != 0
&& text1.getText().length() != 0
&& text2.getText().length() != 0
&& text3.getText().length() != 0) {
student.setId(text.getText());
student.setFirstName(text1.getText());
student.setLastName(text2.getText());
student.setProgram(text3.getText());
ModelProvider students =ModelProvider.INSTANCE;
students.getStudents().add(student);
IWorkbenchWindow window = getSite().getWorkbenchWindow();
IWorkbenchPage page = window.getActivePage();
StudentsView view = (StudentsView) page.findView(StudentsView.ID);
view.getViewer().refresh();
getSite().getPage().closeEditor(getSite().getPage().findEditor(getEditorInput()) , false);
}
}
});
}
</source><br/>
When modifying the code, add necessary imports when the eclipse code editor creates error of not finding some classes.<br/>
==== "Delete Student" Command ====
