Remove arrow on JavaFX menuButton

问题

Hi JavaFX Stylesheet expert,

How do I remove the default arrow on JavaFX menuButton.

I have figured how to change the color and make in unvisible with

.menu-button {
    -fx-mark-color: transparent;
}

or

.menu-button .arrow {
    -fx-background-color: transparent;
}

but, I don't want the gap because of the unvisible arrow.

Thanks for your advice.

Best Regards,

Ivan

回答1:

If we look into the source code of MenuButtonSkinBase, the sub structure of MenuButton seems to be

MenuButton
   |——— label (LabeledImpl)
   |——— arrowButton (StackPane)
            |——— arrow (StackPane)

So to hide the "arrow" it is enough to set padding to 0 for both StackPanes:

.menu-button > .arrow-button {
    -fx-padding: 0;
}

.menu-button > .arrow-button > .arrow {
    -fx-padding: 0;
}

回答2:

There are several ways to do this, here are four. The code is Jython with JavaFX. You can edit it for your needs.

---

First, the enum, for context.

public enum URLBarArrowConstants {
     //URLBarArrow Constants
     BYCSS_AND_SHAPE,
     BYCSS_AND_NO_SHAPE,
     NOCSS_AND_SHAPE,
     NOCSS_AND_NO_SHAPE;
}

Second, the css files, for context.

EG #1

/*ComboBox's Arrow is a Region.*/
.combo-box .arrow-button .arrow {
     -fx-shape: "...";
     -fx-scale-shape: true;
     -fx-position-shape: true;
}

EG#2

/*ComboBox's Arrow is a Region.*/
.combo-box .arrow-button .arrow {
    /*Setting either of these two will do.*/
     -fx-background-color: transparent; 
     -fx-opacity: 0.0;  
}

/*ComboBox's Arrow Button is a Stack Pane.*/
.combo-box .arrow-button{
    -fx-background-position: center;
    -fx-background-repeat: no-repeat;
    -fx-background-image: url("..<file>.png");
}

---

The method, in my main file.

def setCustomURLBarArrow(self, url_bar, scene, URLBarArrowConstant):
    from javafx.scene.paint import Paint
    from javafx.scene.shape import Shape, SVGPath, FillRule

Don't configure the ComboBox Arrow by CSS, instead, do it programmatically and change the Regions SVG Shape

if URLBarArrowConstant == URLBarArrowConstants.NOCSS_AND_SHAPE:

    #SVG Object
    previous_url_bar = SVGPath()

    #SVG Path
    previous_url_bar.setContent("...") # edit this 

    #SVG Fill Rule
    previous_url_bar.setFillRule(FillRule.NON_ZERO)

    #Set Fill -- 
    previous_url_bar.setFill(Paint.valueOf(Color.web("...").toString())) //edit here

    #Apply CSS Sheet
    url_bar.applyCss()

    #Set Region's Shape
    arrow_region = url_bar.lookup(".arrow").setShape(previous_url_bar)

Configure the ComboBox Arrow by CSS and change the Regions SVG Shape

elif URLBarArrowConstant == URLBarArrowConstants.BYCSS_AND_SHAPE:
    #Apply Stylesheet for URL Bar
    scene.getStylesheets().add(File("..<file>.css").toURI().toString()) //edit here

Configure the ComboBox Arrow by CSS but instead, merely hide the arrow by setting the transparency/opacity values and set a background.

elif URLBarArrowConstant == URLBarArrowConstants.BYCSS_AND_NO_SHAPE:
    #Apply Stylesheet for URL Bar
    scene.getStylesheets().add(File("..<file>.css").toURI().toString()) //edit here

Don't configure the ComboBox Arrow by CSS, instead, do it programmatically and merely hide the arrow by setting the transparency/opacity values and set a background.

elif URLBarArrowConstant == URLBarArrowConstants.NOCSS_AND_NO_SHAPE:

    from javafx.scene.paint import Paint
    from javafx.scene.layout import CornerRadii
    from javafx.scene.layout import Background, BackgroundSize, BackgroundImage, BackgroundPosition, BackgroundRepeat, BackgroundFill

    #Apply CSS Sheet
    url_bar.applyCss()

    #Grab Arrow(Region), ArrowButton(StackPane) ComboBox properties
    arrow_region = url_bar.lookup(".arrow")
    arrow_button = url_bar.lookup(".arrow-button")

    #Either Set Opacity to 0 or set background color to transparent.
    arrow_region.setOpacity(0.0)
    arrow_region.setBackground( Background( array(BackgroundFill, [BackgroundFill( Paint.valueOf(Color.TRANSPARENT.toString()), CornerRadii.EMPTY, Insets.EMPTY)]) ) )

    #Set a Background Image for the .arrow-button StackPane.
    arrow_button.setBackground(Background( array(BackgroundImage, [BackgroundImage( Image( String(File('..<file>.png').toURI().toString()), True) , BackgroundRepeat.NO_REPEAT, BackgroundRepeat.NO_REPEAT, BackgroundPosition.CENTER, BackgroundSize.DEFAULT)] ) ) )       //if you want, edit this

来源：https://stackoverflow.com/questions/30210117/remove-arrow-on-javafx-menubutton