ShellBrowser Delphi Components Documentation
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The OnBeforeCommand event is fired before a command (usually a context menu command) is executed.
TOnBeforeCommand = procedure (Sender: TObject; var pCommandArgs: TBeforeCommandEventArgs) of object;
Parameters |
Description |
Sender |
The sender that processes the event. |
pCommandArgs |
A TBeforeCommandEventArgs record, that holds details on the command. |
procedure TMainForm.ShellListBeforeShellCommand(Sender: TObject; const Command: string; Items: IItemIdListCollection; var AllowExecute: Boolean); begin if Items.Count <> 1 then exit; //suppress the default action for text files. if (TShellCommand(Command) in [TShellAction.saDefault, TShellAction.saOpen]) and (UpperCase(ExtractFileExt(Items[0].Path)) = '.TXT') then begin AllowExecute := false; //additionally you might handle the action yourself. ShowMessage('Custom action'); end; end; //using the new BeforeCommand event procedure TMainForm.ShellListBeforeCommand(Sender: TObject; var pCommandArgs: TBeforeCommandEventArgs); begin //always open folder internally, instead of opening a File Explorer instance. if (pCommandArgs.Command = TShellAction.saOpen) and (pCommandArgs.CommandSource = TCommandSource.ContextMenu) and (pCommandArgs.Items.Count = 1) and (pCommandArgs.Items[0].IsFolder) then begin pCommandArgs.Cancel := true; ShellList.FolderIdList := pCommandArgs.Items[0]; end; end;