Posted on 2008-01-03 08:54
笑看人生 閱讀(2866)
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Java插件開發(fā)
為了實(shí)現(xiàn)流程編輯器，光有我們建立的模型，控制器和視圖還不夠，我們還必須新建一個編輯器類，為此，我們要新建一個插件項(xiàng)目，我們新建的插件項(xiàng)目com.example.workflow結(jié)構(gòu)如下：
為了實(shí)現(xiàn)一個編輯器，我們必須擴(kuò)展org.eclipse.ui.editors這個擴(kuò)展點(diǎn)，這個可以在plugin.xm定義，定義后的文件如下：
<extension
point="org.eclipse.ui.editors">
<editor
class="com.example.workflow.ui.WorkflowProcessEditor"
default="true"
extensions="workflow"
icon="src/com/example/workflow/icons/shapes.gif"
id="com.example.workflow.WorkflowProcessEditor"
name="流程設(shè)計器"/>
</extension>
其中，class屬性指定我們編輯器對應(yīng)的類；
Extensions屬性指定編輯器打開文件的擴(kuò)展名為workflow；
Default屬性指出該編輯器是擴(kuò)展名為workflow文件的默認(rèn)打開方式；
Icon為擴(kuò)展名為workflow的文件和編輯器的圖標(biāo)；
Id屬性為編輯器的唯一標(biāo)識
Name為編輯器顯示的名稱
同時，我們還必須定義插件運(yùn)行時要依賴的包，打開META－INF中的文件MANIFEST.MF ,添加依賴項(xiàng)就可以，最后文件內(nèi)容如下：
Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: Workflow Plug-in
Bundle-SymbolicName: com.example.workflow;singleton:=true
Bundle-Version: 1.0.0
Bundle-Activator: com.example.workflow.Activator
Bundle-Vendor: EXAMPLE
Bundle-Localization: plugin
Require-Bundle: org.eclipse.ui,
org.eclipse.core.runtime,
org.eclipse.gef,
org.eclipse.ui.editors,
org.eclipse.ui.ide,
org.eclipse.core.resources,
org.eclipse.ui.views
Eclipse-LazyStart: true
現(xiàn)在我們就可以來定義編輯器對應(yīng)的類了WorkflowProcessEditor，代碼如下：
package com.example.workflow.ui;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.gef.DefaultEditDomain;
import org.eclipse.gef.GraphicalViewer;
import org.eclipse.gef.editparts.ScalableFreeformRootEditPart;
import org.eclipse.gef.palette.PaletteRoot;
import org.eclipse.gef.ui.parts.GraphicalEditorWithFlyoutPalette;
import org.eclipse.ui.IEditorInput;
import com.example.workflow.model.WorkflowProcess;
import com.example.workflow.parts.WorkflowProcessEditPartFactory;
public class WorkflowProcessEditor extends GraphicalEditorWithFlyoutPalette
{
private WorkflowProcess process;
private static PaletteRoot PALETTE_MODEL;
public WorkflowProcessEditor(){
setEditDomain(new DefaultEditDomain(this));
}
private WorkflowProcess getModel(){
return this.process;
}
protected void initializeGraphicalViewer() {
super.initializeGraphicalViewer();
GraphicalViewer viewer = getGraphicalViewer();
viewer.setContents(getModel());
}
protected void configureGraphicalViewer() {
super.configureGraphicalViewer();
GraphicalViewer viewer = getGraphicalViewer();
viewer.setEditPartFactory(new WorkflowProcessEditPartFactory());
viewer.setRootEditPart(new ScalableFreeformRootEditPart());
}
protected void setInput(IEditorInput input) {
super.setInput(input);
process = new WorkflowProcess();
}
protected PaletteRoot getPaletteRoot() {
if (PALETTE_MODEL == null)
PALETTE_MODEL = WorkflowProcessEditorPaletteFactory.createPalette();
return PALETTE_MODEL;
}
public void doSave(IProgressMonitor monitor) {
// TODO Auto-generated method stub
}
}
這個類繼承了GraphicalEditorWithFlyoutPalette，帶有面板的圖形化編輯器。在這個類getPaletteRoot()方法中，我們定創(chuàng)建了面板，面板類詳細(xì)信息，接下來將介紹。在setInput方法中，我們定義了一個流程對象，在這里我們也可以從外面文件讀入一個對象，作為編輯器的輸入，在構(gòu)造函數(shù)中，setEditDomain(new DefaultEditDomain(this));就是給當(dāng)前編輯器設(shè)置一個默認(rèn)編輯域，這個域跟命令堆棧有關(guān)。在initializeGraphicalViewer()方法中，我們把GraphicalViewer的內(nèi)容設(shè)計為流程，說明我們以后編輯的是一個流程對象，在configureGraphicalViewer()，我們把第二講中定義的模型和控制器映射的類注冊進(jìn)來，這樣編輯器就知道模型和控制器的映射關(guān)系了。
接下來我們再看一下面板對應(yīng)的類：
package com.example.workflow.ui;
import org.eclipse.gef.palette.CombinedTemplateCreationEntry;
import org.eclipse.gef.palette.ConnectionCreationToolEntry;
import org.eclipse.gef.palette.MarqueeToolEntry;
import org.eclipse.gef.palette.PaletteContainer;
import org.eclipse.gef.palette.PaletteDrawer;
import org.eclipse.gef.palette.PaletteGroup;
import org.eclipse.gef.palette.PaletteRoot;
import org.eclipse.gef.palette.PaletteSeparator;
import org.eclipse.gef.palette.PanningSelectionToolEntry;
import org.eclipse.gef.palette.ToolEntry;
import org.eclipse.gef.requests.CreationFactory;
import org.eclipse.gef.requests.SimpleFactory;
import org.eclipse.jface.resource.ImageDescriptor;
import com.example.workflow.Activator;
import com.example.workflow.model.Activity;
import com.example.workflow.model.EndActivity;
import com.example.workflow.model.StartActivity;
/** *//**
*UtilityclassthatcancreateaGEFPalette.
*@see#createPalette()
*/
finalclass WorkflowProcessEditorPaletteFactory {
/** *//**
*CreatesthePaletteRootandaddsallpaletteelements.
*Usethisfactorymethodtocreateanewpaletteforyourgraphicaleditor.
*@returnanewPaletteRoot
*/
static PaletteRoot createPalette(){
PaletteRoot palette = new PaletteRoot();
palette.add(createToolsGroup(palette));
palette.add(createActivitiesDrawer());
return palette;
}
/** *//**Createthe"Activities"drawer.*/
privatestatic PaletteContainer createActivitiesDrawer() {
PaletteDrawer componentsDrawer = new PaletteDrawer("Process");
CombinedTemplateCreationEntry component = new CombinedTemplateCreationEntry(
"Start",
"Create a StartActivity",
StartActivity.class,
new SimpleFactory(StartActivity.class),
ImageDescriptor.createFromFile(Activator.class, "icons/start16.gif"),
ImageDescriptor.createFromFile(Activator.class, "icons/start24.gif"));
componentsDrawer.add(component);
component = new CombinedTemplateCreationEntry(
"Activity",
"Create a Activity",
Activity.class,
new SimpleFactory(Activity.class),
ImageDescriptor.createFromFile(Activator.class, "icons/activity16.gif"),
ImageDescriptor.createFromFile(Activator.class, "icons/activity24.gif"));
componentsDrawer.add(component);
component = new CombinedTemplateCreationEntry(
"End",
"Create a EndActivity",
Activity.class,
new SimpleFactory(EndActivity.class),
ImageDescriptor.createFromFile(Activator.class, "icons/end16.gif"),
ImageDescriptor.createFromFile(Activator.class, "icons/end24.gif"));
componentsDrawer.add(component);
return componentsDrawer;
}
/** *//**Createthe"Tools"group.*/
privatestatic PaletteContainer createToolsGroup(PaletteRoot palette) {
PaletteGroup toolGroup = new PaletteGroup("Tools");
// Add a selection tool to the group
ToolEntry tool = new PanningSelectionToolEntry();
toolGroup.add(tool);
palette.setDefaultEntry(tool);
// Add a marquee tool to the group
toolGroup.add(new MarqueeToolEntry());
// Add a (unnamed) separator to the group
toolGroup.add(new PaletteSeparator());
tool = new ConnectionCreationToolEntry(
"Transition",
"Create a Transiton",
new CreationFactory() {
public Object getNewObject() { returnnull; }
public Object getObjectType() { returnnew Integer(1); }
},
ImageDescriptor.createFromFile(Activator.class, "icons/transition16.gif"),
ImageDescriptor.createFromFile(Activator.class, "icons/transition24.gif"));
toolGroup.add(tool);
return toolGroup;
}
}
這樣，我們的gef項(xiàng)目就可以運(yùn)行起來了，效果如下圖：
對照面板的外觀，讀者應(yīng)該很容易明白面板類的含義，下一節(jié)我們將介紹如何在編輯器中創(chuàng)建活動。
代碼下載