问题描述
主题主题在 Eclipse 插件开发的其他领域似乎很简单,例如对话框上的自己的工具栏。在本例中,我通过 plugin.xml 向我的透视图中的主工具栏添加了一个下拉菜单,如下所示
<menuContribution
locationURI="toolbar:org.eclipse.ui.main.toolbar">
<toolbar
id="com.company.ui.toolbar2">
// other items removed for clarity
// following is a drop-down
<command
commandId="com.company.ui.mydropdown"
label="%config.label.default"
icon="icons/myIcon.png"
style="pulldown">
<visibleWhen checkEnabled="false">
<reference deFinitionId="com.company.ui.visibilityTester"/>
</visibleWhen>
</command>
</toolbar>
</menuContribution>
我已经在别处定义了命令,并在 plugin.xml 文件中找到了一个处理程序,该处理程序当前的工作方式与按钮一样。
但是,下拉列表未填充。由于以下原因,我需要一种动态填充的方法:
我注意到其他在线示例尝试以不同的方式创建下拉列表,但我对这些连接方式存在知识空白。例如,在使用 Contribution 的地方,并不总是清楚它如何链接回 plugin.xml 文件中的特定定义。我还没有看到一个例子可以清楚地说明这一点。
我需要支持 Eclipse 4.4.2 及更高版本,因此当代 Eclipse 4 示例可能不合适。
感谢任何帮助。
解决方法
答案是向菜单贡献的工具栏部分添加一个控件,例如:
<menuContribution locationURI="toolbar:org.eclipse.ui.main.toolbar">
<toolbar id="com.company.ui.customToolbar">
<control
class="com.company.ui.MyDropDownContribution"
icon="icons/yourIconHere.png"
label="%config.label.default">
id="theDropdown">
<visibleWhen checkEnabled="false">
<reference definitionId="com.company.ui.isMyTestCaseSatisfied"/>
</visibleWhen>
</control>
</toolbar>
</menuContribution>
然后实现一个扩展 WorkbenchWindowControlContribution 的贡献类。我的简化代码,其中包括从列表项之一启动 EXE 的方法(并且可以重新用于做其他事情),本质上是:
public class MyDropDownContribution extends
WorkbenchWindowControlContribution {
private Combo dropdownlist;
private boolean listenerAdded = false;
private String currentlySelected = "Item 1";
private String[] listOfItems = new String[]{ "Item 1","Item 2","Item 3","Launch my EXE" };
private final SelectionAdapter selectionListener = new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
if(e.widget instanceof Combo) {
// if the selection is currentlySelected,do nothing
if(dropdownlist.getText().equals(currentlySelected)) {
return;
}
//if the selection is to launch 'something',do that
if(dropdownlist.getText().equals("Launch my EXE")) {
launchExecutable();
} else {
// otherwise,a new item has been selected,do what you need to
}
}
}
};
private void launchExecutable() {
// place your code to launch your EXE here - you could do some other special case,not just launch EXE
}
@Override
protected Control createControl(Composite parent) {
Composite container = new Composite(parent,SWT.NONE);
GridLayout glContainer = new GridLayout(1,false);
glContainer.marginTop = 0;
glContainer.marginHeight = 0;
glContainer.marginWidth = 0;
container.setLayout(glContainer);
GridData glReader = new GridData(SWT.FILL,SWT.FILL,false,1,1);
glReader.widthHint = 150;
dropdownlist = new Combo(container,SWT.BORDER | SWT.READ_ONLY
| SWT.DROP_DOWN);
dropdownlist.setLayoutData(glReader);
populateDropdown();
toggleComboListener();
return container;
}
private void toggleComboListener() {
if(listenerAdded) {
dropdownlist.removeSelectionListener(selectionListener);
} else {
dropdownlist.addSelectionListener(selectionListener);
}
listenerAdded = !listenerAdded;
}
public void populateDropdown() {
PlatformUI.getWorkbench().getDisplay().syncExec(new Runnable() {
@Override
public void run() {
dropdownlist.setItems(new String[]{});
for(String itemName : listOfItems) {
dropdownlist.add(itemName);
}
dropdownlist.setText(currentlySelected);
}
});
}
}