我的看法是,plugin.xml實現是要走的路。
我主要有兩個原因,使用這種方法:
- 這真的很容易重新配置和重組的菜單和按鈕,而無需編寫Java代碼。
- 非常清晰的菜單樹分層可視化。
這是實現菜單和子菜單的代碼片段。在這個例子中,它們被添加到主菜單中。
你可以粘貼到您的plugin.xml:
<extension
name="Main Menu Contributions"
point="org.eclipse.ui.menus">
<menuContribution
allPopups="false"
locationURI="menu:org.eclipse.ui.main.menu">
<menu
id="fileMenu"
label="File">
<command
commandId="org.eclipse.ui.file.exit"
label="Exit"
style="push">
</command>
</menu>
<menu
label="Edit">
<command
commandId="org.eclipse.ui.edit.selectAll"
label="Select All"
style="push">
</command>
<menu
label="Submenu">
<command
commandId="org.eclipse.ui.edit.selectAll"
label="Select All Submenu"
style="push">
</command>
<command
commandId="org.eclipse.ui.edit.delete"
label="Delete submenu"
style="push">
</command>
</menu>
</menu>
</menuContribution>
</extension>
對於激活/停用一個菜單,你必須使用核心表達式啓用/禁用命令處理程序。如果命令沒有附加任何活動處理程序,則它將被禁用。因此,調用該命令的菜單項也將被禁用。
以下代碼片段顯示瞭如何在視圖的工具欄上創建按鈕,並根據變量的值啓用/禁用該按鈕。請記住,您必須更改此代碼中的某些內容才能使其正常工作。大多數更改是用於引用名稱和類實現。
創建工具欄(plugin.xml中)按鈕:
<extension
name="View Toolbar Contributions"
point="org.eclipse.ui.menus">
<menuContribution
allPopups="false"
locationURI="toolbar:myapp.views.MyView">
<command
commandId="myapp.commands.PauseSound"
icon=""
label="Pause Playback Sound"
style="push"
tooltip="Pause">
</command>
</menuContribution>
</extension>
創建命令文件(plugin.xml):
<extension
id="myapp.commands.PauseSound"
name="Pause sound command"
point="org.eclipse.ui.commands">
<command
id="myapp.commands.PauseSound"
name="Pause Sound">
</command>
</extension>
創建命令處理程序(插件。XML):
<extension
point="org.eclipse.ui.handlers">
<handler
commandId="myapp.commands.PauseSound">
<activeWhen>
<with
variable="myapp.commands.sourceprovider.active">
<or>
<equals
value="PLAYING">
</equals>
<equals
value="PAUSED">
</equals>
</or>
</with>
</activeWhen>
<class
class="myapp.rcp.commands.toolbar.PausePlayback">
</class>
</handler>
</extension>
創建該命令的狀態變量文件(plugin.xml):
<extension
point="org.eclipse.ui.services">
<sourceProvider
provider="myapp.commands.sourceprovider.CommandState">
<variable
name="myapp.commands.sourceprovider.active"
priorityLevel="workbench">
</variable>
</sourceProvider>
</extension>
實現改變變量的狀態類:如何
public class CommandState extends AbstractSourceProvider {
public final static String STATE = "myapp.commands.sourceprovider.active";
public final static String STOPPED = "STOPPED";
public final static String PLAYING = "PLAYING";
public final static String PAUSED = "PAUSED";
public final static String NOT_LOADED = "NOT_LOADED";
enum State {
NOT_LOADED, PLAYING, PAUSED, STOPPED
};
private State curState = State.NOT_LOADED;
@Override
public void dispose() {
}
@Override
public String[] getProvidedSourceNames() {
return new String[] { STATE };
}
// You cannot return NULL
@SuppressWarnings("unchecked")
@Override
public Map getCurrentState() {
Map map = new HashMap(1);
if (curState == State.PLAYING)
map.put(STATE, PLAYING);
else if (curState == State.STOPPED)
map.put(STATE, STOPPED);
else if (curState == State.PAUSED)
map.put(STATE, PAUSED);
return map;
}
public void setPlaying() {
fireSourceChanged(ISources.WORKBENCH, STATE, PLAYING);
}
public void setPaused() {
fireSourceChanged(ISources.WORKBENCH, STATE, PAUSED);
}
public void setStopped() {
fireSourceChanged(ISources.WORKBENCH, STATE, STOPPED);
}
public void setNotLoaded() {
fireSourceChanged(ISources.WORKBENCH, STATE, NOT_LOADED);
}
}
更多細節要實現這些功能可以在以下位置找到:
+1好例子! – 2011-08-20 14:46:55