IRibbonControl的多个窗口的上下文

我创建了一个示例后台扩展。我需要从相应的演示文稿中获取一些信息并显示该信息。

我尝试使用IRibbonControl的Context对象，但它从后台返回控件的ActiveWindow。

I created a sample backstage extention. I need to get some info from the corresponding presentation and display that info.
I tried to use Context object of IRibbonControl, but it returns ActiveWindow for controls from both backstages.

创建2个演示文稿："演示文稿1"和"演示2"，后台开放 - >两个窗口中的自定义选项卡单击任何按钮。两个按钮都有相同的文字。



所以问题：是否有任何方法可以获得后台控制的相应窗口。

Create 2 presentations: "Presentation 1" and "Presentation 2", open backstage -> Custom Tab in both windows. Click any button. Same text will be in both buttons.

So the question: is there any way to get a corresponding window for the backstage control.

请参阅下面的自定义ui和代码。

See custom ui and code below.

<?xml version="1.0" encoding="UTF-8"?>
<customUI xmlns="http://schemas.microsoft.com/office/2009/07/customui" onLoad="Ribbon_Load">
  <backstage>
    <tab id="tabAccount" label="Custom Tab" title="Custom Tab">
      <firstColumn>
        <taskFormGroup id="customTaskFormGroup">
          <category id="customCategory">
            <task id="customTask" label="Custom Task">
              <group id="customGroup" showLabel="true">
                <primaryItem>
                  <button id="testButton" getLabel="GetLabel" onAction="DoAction" />
                </primaryItem>
              </group>
            </task>
          </category>
        </taskFormGroup>
      </firstColumn>
    </tab>
  </backstage>
</customUI>

namespace PowerPointContext
{
    [ComVisible(true)]
    public class CustomBackstage : Office.IRibbonExtensibility
    {
        private Office.IRibbonUI ribbon;

        public string GetCustomUI(string ribbonID)
        {
            var customUI = GetResourceText("PowerPointContext.CustomBackstage.xml");
            return customUI;
        }

        public void Ribbon_Load(Office.IRibbonUI ribbonUI)
        {
            this.ribbon = ribbonUI;
        }

        public String GetLabel(Office.IRibbonControl control)
        {
            return "Active Presentation: "   (control.Context as DocumentWindow).Caption;
        }

        public void DoAction(Office.IRibbonControl control)
        {
            ribbon.InvalidateControl("testButton");
        }

        #region Helpers

        private static string GetResourceText(string resourceName)
        {
            Assembly asm = Assembly.GetExecutingAssembly();
            string[] resourceNames = asm.GetManifestResourceNames();
            for (int i = 0; i < resourceNames.Length;   i)
            {
                if (string.Compare(resourceName, resourceNames[i], StringComparison.OrdinalIgnoreCase) == 0)
                {
                    using (StreamReader resourceReader = new StreamReader(asm.GetManifestResourceStream(resourceNames[i])))
                    {
                        if (resourceReader != null)
                        {
                            return resourceReader.ReadToEnd();
                        }
                    }
                }
            }
            return null;
        }

        /// <summary>
        /// Converts the slide to image.
        /// </summary>
        /// <returns></returns>
        private String ConvertSlideToImage(PowerPoint.Slide slide)
        {
            if (slide != null)
            {
                var tempFileName = System.IO.Path.GetTempFileName();
                slide.Export(tempFileName, "JPG");
                return tempFileName;
            }
            return "";
        }

        #endregion

    }
}