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• TDMTextSource
  TDMTextSource 处理从你的程序到另一个程序的数据。你可以在表单中分派一个 TWinControl 到DonorComponent 属性，用控件的 OnMouseDown 事件检测拖动，调用 Execute 方法。通过使用 CustomFormatData 属性，TDMTextSource 也用在拖动任意非文本格式。
• TDMTextTarget
  TDMTextTarget 处理接受从一个程序拖动到另一个程序的数据。通过使用 CustomFormat 属性，TDMTextTarget 也用在接受任意非文本格式。
• TDMGraphicSource
  与 TDMTextTarget 中原生的格式不同，图片是最需要拖放的数据类型。为方便起见，我们提供 TDMGraphicSource，它与 TDMTextSource 工作方式类似，除了它有 DonorImage 和 Picture 属性（分别是 TImage 和 TPicture 类型），对应 TDMTextSource 的 DonorComponent 和 Text 属性。拖动图片只需分派它到属性、检测拖动和调用 Execute。
• TDMGraphicTarget
  TDMGraphicTarget 可以接受从另一程序拖动来的图片。为方便起见，它处理多格式，例如DIB、位图句柄、元文件和增强元文件，因此开发者只需为接受的 TPicture 数据提供一个位置。当然，有许多地方可以自定义处理过程，就像其他组件一样。

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.