• TDMTextSource
  TDMTextSource 處理從你的程序到另一個(gè)程序的數(shù)據(jù)。你可以在表單中分派一個(gè) TWinControl 到DonorComponent 屬性，用控件的 OnMouseDown 事件檢測(cè)拖動(dòng)，調(diào)用 Execute 方法。通過使用 CustomFormatData 屬性，TDMTextSource 也用在拖動(dòng)任意非文本格式。
• TDMTextTarget
  TDMTextTarget 處理接受從一個(gè)程序拖動(dòng)到另一個(gè)程序的數(shù)據(jù)。通過使用 CustomFormat 屬性，TDMTextTarget 也用在接受任意非文本格式。
• TDMGraphicSource
  與 TDMTextTarget 中原生的格式不同，圖片是最需要拖放的數(shù)據(jù)類型。為方便起見，我們提供 TDMGraphicSource，它與 TDMTextSource 工作方式類似，除了它有 DonorImage 和 Picture 屬性（分別是 TImage 和 TPicture 類型），對(duì)應(yīng) TDMTextSource 的 DonorComponent 和 Text 屬性。拖動(dòng)圖片只需分派它到屬性、檢測(cè)拖動(dòng)和調(diào)用 Execute。
• TDMGraphicTarget
  TDMGraphicTarget 可以接受從另一程序拖動(dòng)來的圖片。為方便起見，它處理多格式，例如DIB、位圖句柄、元文件和增強(qiáng)元文件，因此開發(fā)者只需為接受的 TPicture 數(shù)據(jù)提供一個(gè)位置。當(dāng)然，有許多地方可以自定義處理過程，就像其他組件一樣。

The 4 DropMaster components are:

• TDMTextSource
  TDMTextSource deals with dragging data from your application to another. For simple use, you can assign a TWinControl on your form to the DonorComponent property, detect the drag in the control's OnMouseDown event, and call the Execute method. TDMTextSource is also the component that is used for dragging arbitrary formats other than text, through the use of its CustomFormatData property.
• TDMTextTarget
  TDMTextTarget deals with accepting data dragged into your application from another. TDMTextTarget is also the component that is used for accepting arbitrary formats other than text, through the use of its CustomFormat property.
• TDMGraphicSource
  Other than the native formats in TDMTextTarget, graphic images are the most commonly requested data types for drag and drop. For convenience, we provide TDMGraphicSource which works just like TDMTextSource, except that it has DonorImage and Picture properties (of type TImage and TPicture, respectively), which correspond to the DonorComponent and Text properties of TDMTextSource. Dragging a picture becomes as easy as assigning it to a property, detecting the drag, and calling Execute.
• TDMGraphicTarget
  TDMGraphicTarget can accept pictures dragged from another application. For convenience, it deals with multiple formats like DIBs, bitmap handles, metafiles and enhanced metafiles, so the developer need only provide a home for the TPicture data that is accepted. Of course, there is ample opportunity for customizing the process as with the other components.