我正在开发一个多页面表单编辑器,用于在Eclipse中编辑/创建自定义的XML文件。
MyXMLFormEditor.java
- 实现类是MyXMLFormEditor,它继承了FormEditor。
- 每个FormEditor页面都继承自FormPage(即MyXMLFormPage继承自FormPage)。
- 在FormEditor和实际的XML文件之间,我维护着JDOM模型。
- 我还实现了脏标志处理。因此,用户在表单编辑器中输入的内容会保存到JDOM中,直到用户按下保存按钮。当用户按下保存按钮时,JDOM将被写入/序列化为XML文件。
- 当编辑器处于脏状态(用户更改了表单编辑器中的内容并且未保存)时,撤销操作应该将表单编辑器和JDOM中的更改恢复到原始状态(即编辑器处于非脏状态的状态),重做操作应该再次将更改带回到FormEditor和JDOM中,并使编辑器变为脏状态。
MyXMLFormEditor.java
public class MyXMLFormEditor extends FormEditor {
MyXMLFormEditor(){
super();
}
@Override
protected FormToolkit createToolkit(Display display) {
// Create a toolkit that shares colors between editors.
return new FormToolkit(Activator.getDefault().getFormColors(display));
}
@Override
public void init(IEditorSite site, IEditorInput editorInput) {
setSite(site);
mSite = site;
setInput(editorInput);
try {
super.init(site, editorInput);
} catch (PartInitException e1) {
e1.printStackTrace();
}
if (!(editorInput instanceof IFileEditorInput))
try {
throw new PartInitException("Invalid Input: Must be IFileEditorInput");
} catch (PartInitException e) {
e.printStackTrace();
}
setPartName(fileName);
}
public void setUpProgFile(IEditorSite site, IEditorInput editorInput){
IFileEditorInput fileInput = ((IFileEditorInput) editorInput);
//create document builder and prepare JDom model for xml file.
}
@Override
protected void addPages() {
try {
//add 'Main' page
objMyXMLFormPage = new MyXMLFormPage (this, "FirstPage","Main");
//set rootNode of MyXMLFormPage
objMyXMLFormPage.rootNode = getRootNode();
objMyXMLFormPage.filePath = filePath;
objMyXMLFormPage.document = document;
addPage(objMyXMLFormPage);
} catch (PartInitException e) {
e.printStackTrace();
}
}
@Override
public void doSave(IProgressMonitor monitor) {
System.out.println("MyXMLFormEditor: doSave");
//logic to write jdom contents into xml file.
objMyXMLFormPage.setDirty(false);
}
@Override
public void doSaveAs() {
System.out.println("MyXMLFormEditor: doSaveAs");
}
@Override
public boolean isSaveAsAllowed() {
System.out.println("MyXMLFormEditor: isSaveAsAllowed");
return true;
}
}
我的XML表单页面.java
public class MyXMLFormPage extends FormPage{
//private members declaration.
public MyXMLFormPage (MyXMLFormEditor editor,String title, String id) {
// initialize the editor and set its title and name.
super(editor,title,id );
}
@Override
public void createFormContent(IManagedForm managedForm) {
// Set page title
super.createFormContent(managedForm);
FormToolkit mMyXMLFormPage Toolkit = managedForm.getToolkit();
//Logic to creat UI and populating its contents from JDom
}
private void makeEditorDirty() {
updateJdom = true;
setDirty(true);
}
private void updateJDom() {
if(updateJdom){
System.out.println("*** Jdom updated ***");
updateJdom = false;
}
}
@Override
public boolean isDirty() {
return isDirtyFlag;
}
protected void setDirty(boolean value) {
isDirtyFlag = value;
dirtyStateChanged();
}
public void dirtyStateChanged() {
getEditor().editorDirtyStateChanged();
}
@Override
public boolean isSaveAsAllowed() {
System.out.println("MyXMLFormPage .isSaveAsAllowed");
return false;
}
@Override
public void doSave(IProgressMonitor monitor) {
System.out.println("MyXMLFormPage .doSave");
}
}
有人能为我提供关于如何在FormEditor中实现撤销/重做功能的指针/示例吗? 如果该方法利用了Eclipse PDE或workbench的现有撤销/重做框架,那就太好了。