# class KPreviewWidgetBase

### abstract

Module | kio
Namespace |
Class | KPreviewWidgetBase
Inherits | QWidget

Abstract baseclass for all preview widgets which shall be used via KFileDialog.setPreviewWidget(const KPreviewWidgetBase *). Ownership will be transferred to KFileDialog, so you have to create the preview with "new" and let KFileDialog delete it.

Just derive your custom preview widget from KPreviewWidgetBase and implement all the pure virtual methods. The slot showPreview(const KUrl &) is called every time the file selection changes.

Abstract baseclass for all preview widgets. Author Frerich Raabe <raabe@kde.org>

### methods

- KPreviewWidgetBase (parent)

  returns ctor

  Argument | Type | Default
  --- | --- | ---
  parent | QWidget |

  Constructor. Construct the user interface of your preview widget here and pass the KFileDialog this preview widget is going to be used in as the parent.

  parent - The KFileDialog this preview widget is going to be used in

- KPreviewWidgetBase (a0)

  returns ctor
  Not implemented

  Argument | Type | Default
  --- | --- | ---
  a0 | KPreviewWidgetBase |

- clearPreview ( )

  returns Nothing
  pure virtual

  Reimplement this to clear the preview. This is called when e.g. the selection is cleared or when multiple selections exist, or the directory is changed.

- setSupportedMimeTypes (mimeTypes)

  returns Nothing

  Argument | Type | Default
  --- | --- | ---
  mimeTypes | QStringList |

- showPreview (url)

  returns Nothing
  pure virtual

  Argument | Type | Default
  --- | --- | ---
  url | KUrl |

  This slot is called every time the user selects another file in the file dialog. Implement the stuff necessary to reflect the change here.

  url - The URL of the currently selected file.

- supportedMimeTypes ( )

  returns QStringList