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Drop Files Components¶The drop files components comprise two units: PJDropFiles and PJDropFilesDsgn. PJDropFiles¶This unit provides three components that support drag and drop from Windows Explorer along with subsidiary components that can filter dropped files. The components are: | Class | Description | | TPJDropFiles | Container control that catches files dragged and dropped onto its client area or the client area of child controls. | | TPJFormDropFiles | Non-visual component that catches files dragged and dropped from Explorer onto the form that contains the component. | | TPJCtrlDropFiles | Non-visual component that catches files dragged and dropped from Explorer onto an associated control. | | TPJExtFileFilter | File filter component that filters files according to their extension. | | TPJWildCardFileFilter | File filter component that filters files according to a DOS-style wild card. | | TPJFileFilter | An abstract base class for file filter components. |
Other documented types are: The unit also contains undocumented support code and helper classes that are not designed for public use. PJDropFilesDsgn¶This unit contains the design time elements of the drop files components: a component editor, a property editor and the component and editor registration code. The editors are: | Editor class | Description | | TPJExtFileFilterExtPE | Property editor for the Extensions property of the TPJExtFileFilter component. This editor displays a dialog box where extensions can be added, removed and saved in the correct format. | | TPJDropFilesCE | Component editor that causes an event handler for the OnDropFiles events of the drop file components to be opened in the designer when the components are double-clicked. The default action without this component editor is to open the rarely used OnBeforeDrop event handler, which is not very useful. |
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