How do you set the icon of a Dialog control Java FX/Java 8

Question

I might be missing something very obvious, but I can\'t find out how to set the Icon for a Dialog component (ProgressDialog to be more precise). I know how to do that for a Stag

Answer 1

This is a method that I include in my JavaFX projects, simply calling this method and passing the Alert as a parameter will set both the title bar icon and the header graphic.

public class Msg {

public void showInfo(String title, String header, String message) {
    Alert alertShowInfo = new Alert(Alert.AlertType.INFORMATION);
    addDialogIconTo(alertShowInfo); //add icon and header graphic
    alertShowInfo.setTitle(title);
    alertShowInfo.setHeaderText(header);
    alertShowInfo.setContentText(message);
    alertShowInfo.showAndWait();
}

//this adds images to Alert
public void addDialogIconTo(Alert alert) {
    // Add custom Image to Dialog's title bar
    final Image APPLICATION_ICON = new Image("icon.png");
    Stage dialogStage = (Stage) alert.getDialogPane().getScene().getWindow();
    dialogStage.getIcons().add(APPLICATION_ICON);

    // Add custom ImageView to Dialog's header pane.        
    final ImageView DIALOG_HEADER_ICON = new ImageView("icon.png");
    DIALOG_HEADER_ICON.setFitHeight(48); // Set size to API recommendation.
    DIALOG_HEADER_ICON.setFitWidth(48);
    alert.getDialogPane().setGraphic(DIALOG_HEADER_ICON);                       
    }
}

Then, in whatever class I wish to use the Alert, it will already have the customized icon and header graphic.

public static void main(String[] args){
        Msg msg = new Msg();

        // Alert will now include custom icon and header graphic.
        msg.showInfo("Sucess!", "Program succeeded", "Now exiting program");
}