JavaFX-如何将JFXpopup集中在舞台的舞台和动态大小上

Question

I want to make a JFXpopup at the center of the screen with a dynamic width & height. This is what I currently have:

This is the application's first look. To open the popup I have to click an item in the contextmenu:

and after that you get to see the popup:

The popup is centered on the x axis, but apparently not on the y axis. Also when I resize my stage and reopen the popup the size doesn't change.

Now for some code:

contextMenu.getNewLeaf().setOnAction(event -> {
            popup.setPopupContent(createRegistrationFormPane());

            popup.setAutoFix(true);

            double width = globals.getPrimaryStage().getWidth() / 1.5;
            double height = globals.getPrimaryStage().getHeight() / 1.5;

            System.out.println("stage - width: " + globals.getPrimaryStage().getWidth() + "height: " + globals.getPrimaryStage().getHeight());
            System.out.println("width: " + width + " height: " + height);

            popup.getPopupContent().setPrefWidth(width);
            popup.getPopupContent().setPrefHeight(height);

            double anchorX = (globals.getPrimaryStage().getWidth() - width) / 2;
            double anchorY = (globals.getPrimaryStage().getHeight() - height) / 2;

            popup.show(rootPane, JFXPopup.PopupVPosition.TOP, JFXPopup.PopupHPosition.LEFT, anchorX, anchorY);

            item.getChildren().add(new TreeItem<>(new Twitter()));
            contextMenu.freeActionListeners();
        });

globals.getPrimaryStage() returns the stage.
rootPane is the well ... the first Pane.

Here are some values from the system.out.println() :

stage - width: 800.0height: 550.4000244140625
width: 533.3333333333334 height: 366.933349609375

stage - width: 1339.199951171875height: 684.7999877929688  
width: 892.7999674479166 height: 456.5333251953125

As you can see these values do change, but the size of the popup doesn't change.

Any help would be appreciated.

Answer 1

You can center the popup stage over it's parent window using the initOwner() method, assuming popup is a stage:

popup.initOwner(globals.getPrimaryStage())

And it looks like you are creating a new popup each time the action is called and setting the size based on the primaryStage size. If you want it to remember your own sizing, you will need to save those dimensions at some point when the popup is closed.

Answer 2

First of all I notices that getting the stage height includes the topbar ( - [] X ). That is why the popup doesn't vertically center properly. To fix that I added .getScene() and then .getHeight() .

Secondly I now added the changed it to the following: I made it so that the popup is created when the button is clicked. So instead of making 1 jfxpopup I just override the pointer to the popup and let the garbage collector do the rest.

// Option add new leaf
CONTEXT_MENU.getNewLeaf().setOnAction(event -> {
  popup = new JFXPopup();
  try {
    popup.setPopupContent((Region) UTIL
        .getPopupView(UTIL.getView("view/application/popup/FormTest.fxml"), popup));
  } catch (IOException e) {
    e.printStackTrace();
  }
  popup.setAutoFix(true);
  // Width & height of the popup
  double width = GLOBALS.getPrimaryStage().getScene().getWidth() / 1.5;
  double height = GLOBALS.getPrimaryStage().getScene().getHeight() / 1.5;
  popup.getPopupContent().setPrefWidth(width);
  popup.getPopupContent().setPrefHeight(height);
  // X & y axis of the popup
  double anchorX = (GLOBALS.getPrimaryStage().getScene().getWidth() - width) / 2;
  double anchorY = (GLOBALS.getPrimaryStage().getScene().getHeight() - height) / 2;
  popup.show(ROOT_PANE, JFXPopup.PopupVPosition.TOP, JFXPopup.PopupHPosition.LEFT, anchorX,
      anchorY);
  item.getChildren().add(new TreeItem<>(new Twitter()));
  CONTEXT_MENU.freeActionListeners();
});

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1 quistion : When I you say popup.hide() does that remove the instance of that popup? Right now I just let the garbage collector do its thing. Just curious.