CShellTreeCtrl

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CShellTreeCtrl

This is just an example of a content provider class (see article), which overrides the PopulateItem virtual function to show the Shell's resources only when the user wants to access them.

You may easily specify the resource to use as the tree control's root item, or add multiple items at the root level. You have options to display only folders, files, hidden objects, and you can choose how to display the items text. You may also get specific information about the resource associated with an existing item.

User interface features are those offered by the base class and can be further personalized with custom animations.

This version is still under development, in particular, there's no support for filtering (I accept ideas).

Demo Application

The demo project shows how to:

• use the control in a SDI application
• add root items to the control
• set item's options
• display a Shell context menu

You may use the "Test" menu to experiment with the selected item, or see the Shell context menu in the "Shell" menu. Another way to display the Shell context menu is by right-clicking on a tree item (hold on CTRL to see a cascaded popup menu).

Class Reference

CShellTreeCtrl (Still Subject to Change)

CShellTreeCtrl::AddRootItem

void AddRootItem(LPCITEMIDLIST pidl, UINT nFlags = STCF_DEFAULT)

Adds the specified Shell object to the root level of the tree and sets options for the inserted item.

The first argument pidl is the object you want to add, cannot be NULL. You may use SHGetSpecialFolderLocation to get a valid argument for this function.

The nFlags argument specifies the options to apply to the inserted item and can be one or more of the following values, combined with the bitwise or operator:

CShellTreeCtrl::AddRootFolderContent

void AddRootFolderContent(LPCITEMIDLIST pidl, UINT nFlags = STCF_DEFAULT)

Adds the content of the specified Shell folder object to the root level of the tree and sets options for the inserted items.

The first argument pidl is the folder object you want to enumerate. A value of NULL means that the Desktop virtual folder will be added (not its content). You may use SHGetSpecialFolderLocation to get a valid argument for this function.

The nFlags argument specifies the options to apply to the folder object during enumeration (see the previous function). STCF_SHOWxxx flags currently have no effect.

CShellTreeCtrl::GetItemIDList

CShellPidl GetItemIDList(HTREEITEM hItem)

It retrieves the Shell object associated to the specified item. The returned object is invalid if the function fails.

You may use the Shell's functions to get information about the returned value. See SHGetPathFromIDList, SHGetFileInfo documentation.

CShellTreeCtrl::GetItemContextMenu

BOOL GetItemContextMenu(HTREEITEM hItem, CShellContextMenu &rCtxMenu)

It retrieves the Shell context menu associated to the specified item. The return value is non-zero if the function is successful.

(to do)

CShellTreeCtrl::GetCallbackMask

UINT GetCallbackMask()

It retrieves which parts of a tree view item are handled by callback messages.

(see the next function)

CShellTreeCtrl::SetCallbackMask

void SetCallbackMask(UINT nMask)

It specifies which parts of a tree view item are handled by callback messages.

The nMask argument can be one or more of the following values, combined with the bitwise or operator:

Updates

• 17^th October, 2000
  • Initial public release
• 7^th February, 2000
  • Fixed a bug with SHGetFileInfo on some machines, now using IShellFolder::GetAttributesOf (thanks to He Yingxia and Markus Axelsson)
  • Now correctly sort items after insertion
• 23^rd November, 2001
  • New version of the control (beta)
  • Added wrapper classes for shell objects and interfaces
  • Added support for context menu

Conclusion

Please note that this class is not fully functional yet. Any suggestion on how to improve it would be greatly appreciated.

I developed this class also to provide an example of a content provider for my CWaitingTreeCtrl class (see article).

License

This article has no explicit license attached to it, but may contain usage terms in the article text or the download files themselves. If in doubt, please contact the author via the discussion board below.

A list of licenses authors might use can be found here.