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Knowledge Base ShellBrowser Delphi Components


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Can I use ShellBrowser to add a custom context menu entry or add other functionality to Windows Explorer?

Unfortunately this is beyond the scope of ShellBrowser components. You have to write a "shortcut menu handler" or other type of shell extension to do so.

See the Microsoft documentation for an overview.

I want to drag and drop (copy) by default (not move). Do you have a routine that does this?

Setting the property CopyMode to cmCopy should do this job.

I can drag files from JamExplorer to the Windows Explorer, but not the other way round. What is going wrong?

Privileged processes do not receive Drag&Drop from non-privileged processes for security reasons. This could be the case if you start your IDE or your executable as admin.

How can I use Drag&Drop between the ShellBrowser Components and Delphi's TListView / TListBox?

Unfortunately it is not possible to mix OLE Drag&Drop and Delphi Drag&Drop, because they work completely different.
The ShellBrowser components can interact with all other OLE enabled applications like Explorer, Word etc. All ShellBrowser Components can interact which each other with the OLE Drag&Drop.

In my application I want to restrict the access to only some folders or a single branch of the file system. How can achieve this?

There are several measures you can take, depending on the components you are using:

In the TJamShellTree, you can set the root nodes via the MultipleRoots and RootedAt properties. RootedAt is also available for the BreadCrumbBar.

To avoid, that a user manually opens a folder you have different options of interception:

Does the ShellBrowser Delphi Edition contain a control to preview files?

Yes, it contains the TJamFilePreview control.

What is the difference between the TJamShellList and TJamExplorerBrowser?

When configuring TJamExplorerBrowser to only include the FolderView, it looks much like the TJamShellList.

TJamExplorerBrowser wraps a Windows system component, and thus it will look exactly like Windows File Explorer.The TJamShellList on the other hand derives a VCL ListView control, that tries to resemble Windows File Explorer as much as possible. While it misses some aspects of this, it can on the other hand be customized more widely visually and functionally.

How can I prevent a file from being opened in the TJamShellList?

Assign the OnKeyDown event with this content:
if Key = vk_Return then Key := 0;

To prevent the automatic handling of a double click, simply add an OnDblClick event handler.

Or, you can use the OnBeforeShellCommand event and use the AllowExecute parameter to prevent the execution. The Command parameter when opening a file will be "default" or "open".

I get a memory leak report that an instance of TComboBoxExEnumerator is not freed. Can this be avoided?

This problem applies to Windows XP only and is fixed in Windows Vista and later. It is documented in MSDN. With the current implementation of TComboBoxEx in the VCL this unfortunately cannot be avoided.

How can I show XYZ as a thumbnail?

The thumbnails are generated through the same Windows API function that the Windows Explorer uses, and so the ShellBrowser components will show similar thumbnails like the Windows Explorer.

To provide thumbnails for a certain file format that Windows does not support out of the box, it is best to register a thumbnail provider in the system.

Another option is to use the OnThumbnailUpdated event of the TJamShellList control, which allows you to change the generated thumbnail.

allows you to set one application-wide thumbnail provider that is called if the system does not supply one.

How can I select the columns that are (initially) displayed in the TJamShellList?

Each Windows Shell extension may define which columns will be displayed for its view.To add or remove specific columns, use the OnCreateColumns event in combination with SetColumnVisibility. 

uses ShellBrowser;

procedure TForm1.JamShellListCreateColumns(Sender: TObject);
   with JamShellList do
       SetColumnVisibility(TShellColumns.Size, False);
       SetColumnVisibility(TShellColumns.Author, True);

How can I order ShellBrowser Delphi Edition and how will it be delivered?

You may order online at www.jam-software.com

For further questions, please have a look at the Shop FAQ: