TdxCustomFormattedLabelProperties.OnShowHyperlinkHint Event

Allows you to change a hyperlink hint before it appears.

Declaration

Delphi

property OnShowHyperlinkHint: TdxShowHyperlinkHintEvent read; write;

Remarks

A hyperlink defined in the formatted label can display the target URI in a hint when a user hovers the mouse pointer over the hyperlink. You can handle the OnShowHyperlinkHint event to change the hyperlink hint message for any hyperlink in the formatted label.

Event Occurrence

The OnShowHyperlinkHint event occurs every time a hyperlink hint is about to appear.

Note

Hyperlink hints can appear only if the ShowHyperlinkHint property is set to True (default).

Event Parameters

Sender

Provides access to the formatted label that raised the hyperlink hint display event.

AArgs

Provides access to information related to the hyperlink hint display event that occurred. You can use the AArgs.Hint property to change hint text.

Refer to TdxShowHyperlinkHintEvent and TdxShowHyperlinkHintEventArgs type descriptions for detailed information on all options available within an OnShowHyperlinkHint event handler.

Code Example: Prevent Accidental Hyperlink Activation

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

Delphi

procedure TMyForm.dxFormattedLabel1PropertiesHyperlinkClick(Sender: TObject;
  AArgs: TdxHyperlinkClickEventArgs);  // Requires the Ctrl key for hyperlink activation
begin
  if AArgs.Shift <> [ssCtrl] then  // If the Ctrl key is not held down
    AArgs.Handled := True;  // Prevents hyperlink activation
end;

procedure TMyForm.dxFormattedLabel1PropertiesShowHyperlinkHint(Sender: TObject;
  AArgs: TdxShowHyperlinkHintEventArgs);  // Changes all hyperlink hints
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;

C++

void __fastcall TMyForm::dxFormattedLabel1PropertiesHyperlinkClick(TObject *Sender,
  TdxHyperlinkClickEventArgs *AArgs)  // Requires the Ctrl key for hyperlink activation
{
  if(AArgs->Shift != (TShiftState() << [ssCtrl]))  // If the Ctrl key is not held down
    AArgs->Handled = true;  // Prevents hyperlink activation
}

void __fastcall TMyForm::dxFormattedLabel1PropertiesShowHyperlinkHint(TObject *Sender,
  TdxShowHyperlinkHintEventArgs *AArgs)  // Changes all hyperlink hints
{
  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
}