TdxMessageDialogShowHyperlinkHintDelegate Type

The procedural type for a hyperlink hint display handler in a message dialog.

Declaration

TdxMessageDialogShowHyperlinkHintDelegate = reference to procedure(AArgs: TdxShowHyperlinkHintEventArgs);

Parameters

Name	Type	Description
AArgs	TdxShowHyperlinkHintEventArgs	Stores information related to a hyperlink hint display event in a DevExpress control or its UI element.

Remarks

A hyperlink defined as a part of formatted text in a message box dialog displays the target URI in a hint when the mouse pointer hovers over the hyperlink.

You can implement a handler of the TdxMessageDialogShowHyperlinkHintDelegate type and pass it as the AShowHyperlinkHintProc parameter of any message box creation method to change hint content.

Code Example: Prevent Accidental Hyperlink Activation in Message Boxes

The code example in this section demonstrates TdxMessageDialogHyperlinkClickDelegate and TdxMessageDialogShowHyperlinkHintDelegate handlers. The TdxMessageDialogHyperlinkClickDelegate handler requires a user to hold down the Ctrl key to activate a hyperlink. The TdxMessageDialogShowHyperlinkHintDelegate handler changes all hyperlink hints to prompt a user to hold the Ctrl key for hyperlink activation.

Delphi

procedure TMyForm.LinkClickHandler(AArgs: TdxHyperlinkClickEventArgs);
begin
  if AArgs.Shift <> [ssCtrl] then // If the Ctrl key is not held down
    AArgs.Handled := True;  // Prevents hyperlink activation
end;

procedure TMyForm.LinkHintHandler(AArgs: TdxShowHyperlinkHintEventArgs);
var
  AHintPrefix, AHintURI: string;
begin
  AHintPrefix := 'Ctrl-click to navigate to ';
  AHintURI := AArgs.URI.Remove(0, 8);  // Removes the URI scheme from the hyperlink hint
  AArgs.Hint := AHintPrefix + AHintURI;  // Redefines the hyperlink hint
end;

// This procedure displays a message box with dynamic content and prevents MAILTO links from being opened
procedure TMyForm.ShowMyMessage(const AMessage: string; const ALink: string);
begin
  dxCreateMessageDialog(AMessage + #13#10 + ' [URL=' + ALink + ']' + ALink + '[/URL]',
    LinkClickHandler, LinkHintHandler);
end;

C++

void __fastcall TMyForm::LinkClickHandler(TdxHyperlinkClickEventArgs *AArgs)
{
  if(AArgs->Shift != (TShiftState() << [ssCtrl]))  // If the Ctrl key is not held down
    AArgs->Handled = true;  // Prevents hyperlink activation
}

void __fastcall TMyForm::LinkHintHandler(TdxShowHyperlinkHintEventArgs *AArgs)
{
  UnicodeString AHintPrefix, AHintURI;
  AHintPrefix = "Ctrl-click to navigate to ";
  AHintURI = AArgs->URI.Remove(0, 8);  // Removes the URI scheme from the hyperlink hint
  AArgs->Hint = AHintPrefix + AHintURI;  // Redefines the hyperlink hint
}

// This procedure displays a message box with dynamic content and prevents MAILTO links from being opened
void __fastcall TMyForm::ShowMyMessage(const UnicodeString &AMessage, const UnicodeString &ALink)
{
  dxCreateMessageDialog(AMessage + "\n" + " [URL=" + ALink + "]" + ALink + "[/URL]",
    LinkClickHandler, LinkHintHandler);
}

Direct TdxMessageDialogShowHyperlinkHintDelegate Type References

The following global methods reference the TdxMessageDialogShowHyperlinkHintDelegate procedural type as the AShowHyperlinkHintProc parameter:

dxCreateMessageDialog Overloads

dxCreateMessageDialog(string,TMsgDlgType,TMsgDlgButtons,TMsgDlgBtn,TdxMessageDialogHyperlinkClickDelegate,TdxMessageDialogShowHyperlinkHintDelegate)

Creates a message dialog box form with specified settings.

dxCreateMessageDialog(string,TMsgDlgType,TMsgDlgButtons,TdxMessageDialogHyperlinkClickDelegate,TdxMessageDialogShowHyperlinkHintDelegate)

Creates a message dialog box form with the specified settings.

dxMessageBox Overloads

dxMessageBox(THandle,string,string,Integer,TdxMessageDialogHyperlinkClickDelegate,TdxMessageDialogShowHyperlinkHintDelegate)

Invokes a modal message dialog box.

dxMessageBox(string,string,Integer,TdxMessageDialogHyperlinkClickDelegate,TdxMessageDialogShowHyperlinkHintDelegate)

Invokes a modal message dialog box.

dxMessageDlg Overloads

dxMessageDlg(string,TMsgDlgType,TMsgDlgButtons,Longint,TMsgDlgBtn,TdxMessageDialogHyperlinkClickDelegate,TdxMessageDialogShowHyperlinkHintDelegate)

Invokes a modal message dialog box.

dxMessageDlg(string,TMsgDlgType,TMsgDlgButtons,Longint,TdxMessageDialogHyperlinkClickDelegate,TdxMessageDialogShowHyperlinkHintDelegate)

Displays a modal message dialog box.

dxMessageDlgPos Overloads

dxMessageDlgPos(string,TMsgDlgType,TMsgDlgButtons,Longint,Integer,Integer,TdxMessageDialogHyperlinkClickDelegate,TdxMessageDialogShowHyperlinkHintDelegate)

Invokes a modal message dialog box at the specified position on the screen.

dxMessageDlgPos(string,TMsgDlgType,TMsgDlgButtons,Longint,Integer,Integer,TMsgDlgBtn,TdxMessageDialogHyperlinkClickDelegate,TdxMessageDialogShowHyperlinkHintDelegate)

Invokes a modal message dialog box at the specified position on the screen.

dxMessageDlgPosHelp Overloads

dxMessageDlgPosHelp(string,TMsgDlgType,TMsgDlgButtons,Longint,Integer,Integer,string,TdxMessageDialogHyperlinkClickDelegate,TdxMessageDialogShowHyperlinkHintDelegate)

Invokes a message dialog box whose help topic is supplied in a specified help file.

dxMessageDlgPosHelp(string,TMsgDlgType,TMsgDlgButtons,Longint,Integer,Integer,string,TMsgDlgBtn,TdxMessageDialogHyperlinkClickDelegate,TdxMessageDialogShowHyperlinkHintDelegate)

Invokes a message dialog box whose help topic is supplied in a specified help file.

Miscellaneous dxShowMessage Methods

dxShowMessage(string,TdxMessageDialogHyperlinkClickDelegate,TdxMessageDialogShowHyperlinkHintDelegate)

Invokes a generic message dialog box with an OK button.

dxShowMessageFmt(string,Untyped[],TdxMessageDialogHyperlinkClickDelegate,TdxMessageDialogShowHyperlinkHintDelegate)

Displays a message dialog box with a formatted message.

dxShowMessagePos(string,Integer,Integer,TdxMessageDialogHyperlinkClickDelegate,TdxMessageDialogShowHyperlinkHintDelegate)

Invokes the message dialog box at the specified position on the screen.