java - 即时更改 Eclipse 标题中按钮上的文本

Question

我正在 eclipse 中创建一个 View 来显示堆栈跟踪，我希望可以通过标题中的按钮访问该 View 。所以我正在使用 plugin.xml 框架创建一个扩展，基本上是这样的:

<extension
    point="org.eclipse.ui.commands">
  <command
        categoryId="com.commands.category"
        id="commands.tracing"
        name="0 Traces">
  </command>
 </extension>

这将创建一个文本为“0 traces”的按钮。但是，我想用我在监听器中收集的每个跟踪来增加按钮中的数字。基本上我只需要能够在 Java 文件的标题中编辑按钮，而不是在 plugin.xml 文件中。但我不知道该怎么做!我查看了 Eclipse SDK 帮助，但没有找到任何东西。请帮忙!

我也愿意以任何其他方式在基于 Eclipse 构建的应用程序中实现这一点，只要文本发生变化并单击文本打开一个 View 即可。

Answer 1

我相信标题使用图标，不确定是否可以使用文本。您可以在上下文(弹出)菜单中添加一个条目，该菜单将显示迹线数量，并在单击该项目时启动您的 View 。

我基于 Eclipse 附带的 Hello, World Command 模板，并添加了一个菜单贡献。

我扩展了 CompoundContributionItem 以充当菜单贡献，如下所示。

/**
 * Menu contribution which will update it's label to show the number of current
 * traces.
 */
public class TraceWindowContributionItem extends CompoundContributionItem {
    private static int demoTraceCount = 0;
    /**
     * Implemented to create a label which displays the number of traces.
     */
    @Override
    protected IContributionItem[] getContributionItems() {

        //Here is your dynamic label.
        final String label = getTraceCount() + " traces";

        //Create other items needed for creation of contribution.
        final String id = "test.dynamicContribution";
        final IServiceLocator serviceLocator = findServiceLocator();
        final String commandId = "test.commands.sampleCommand";
        final Map parameters = new HashMap();

        //Here is the contribution which will be displayed in the menu.
        final CommandContributionItem contribution = new CommandContributionItem(
                serviceLocator, id, commandId, parameters, null, null, null,
                label, null, null, SWT.NONE);

        return new IContributionItem[] { contribution };
    }

    /**
     * Demo method simply increments by 1 each time the popup is shown. Your
     * code would store or query for the actual trace count each time.
     * @return
     */
    private int getTraceCount() {
        return demoTraceCount++;
    }

    /**
     * Find the service locator to give to the contribution.
     */
    private IServiceLocator findServiceLocator() {
        return PlatformUI.getWorkbench().getActiveWorkbenchWindow();
    }
}

现在我们需要将其连接到将启动您的 View 的命令和处理程序中。

这是我的 plugin.xml。

<!-- Wire up our dynamic menu contribution which will show the number of traces -->
<extension
     point="org.eclipse.ui.menus">
  <menuContribution
        locationURI="popup:org.eclipse.ui.popup.any?after=additions">
     <dynamic
           class="test.TraceWindowContributionItem"
           id="test.dynamicContribution">
     </dynamic>
  </menuContribution>
</extension>
<!-- Command and handler for launching the traces view -->
<extension
     point="org.eclipse.ui.commands">
  <category
        name="Sample Category"
        id="test.commands.category">
  </category>
  <command
        categoryId="test.commands.category"
        defaultHandler="test.handlers.SampleHandler"
        id="test.commands.sampleCommand"
        name="Sample Command">
  </command>
</extension>
<extension
     point="org.eclipse.ui.handlers">
  <handler
        commandId="test.commands.sampleCommand"
        class="test.handlers.SampleHandler">
  </handler>
</extension>