Issue with JavaFX: Unable to remove additional space on the right side of TabPane

Question

Issue with JavaFX: Unable to remove additional space on the right side of TabPane

While developing a full-screen application on JavaFX 2.2 with tab navigation, I encountered an issue where there is a 10px space at the right side of the headers region. Surprisingly, this space only appears after switching to the last tab and disappears when selecting the first tab again. The other tabs do not affect this space in any way. It seems like the main headers region is causing this gap. I have attached screenshots below to illustrate the problem:

The width of the tabs is calculated using the following formula:

double tabWidth = tabPane.getWidth() / tabPane.getTabs().size();
tabPane.setTabMinWidth(tabWidth);
tabPane.setTabMaxWidth(tabWidth);

All paddings have been removed in CSS classes. Additionally, special colors have been set to identify the culprit of this space - which seems to be the main headers-region. Here are the CSS classes used:

.tab-pane .headers-region {
 -fx-background-color: yellow;
 -fx-padding: 0;
 -fx-background-insets: 0;
 -fx-effect: null;
}

.tab-pane {
 -fx-background-color: white;
 -fx-background-insets:0;
 -fx-padding: 0;
}

*.tab-header-background {
 -fx-padding:0;
 -fx-background-insets:0;
}

.tab-pane *.tab-header-background {
 -fx-padding:0;
 -fx-background-insets:0;
}
...

css user-interface tabs javafx-2 tabpanel

Answer 1

Answer №1

The issue lies within the TabPaneSkin class, responsible for converting Tabs into Nodes. Specifically, it needs to adjust the TabHeaderArea's position when its offset exceeds its width. Take a closer look at the scrollToSelectedTab(double selected, double previous) method in the TabHeaderArea class.

To address this issue, one possible solution is to create a custom skin (such as MyTabPaneSkin) based on TabPaneSkin and modify the behavior of the scrollToSelectedTab method. Since most of its members are private, extending the class directly may not be effective.

To implement this workaround, you can override the createDefaultSkin method in the TabPane class like so:

TabPane tabPane = new TabPane(){
    @Override
    protected Skin<?> createDefaultSkin() {
        return new MyTabPaneSkin(this);
    }   
};

Keep in mind that by using a custom skin, you may lose access to any future updates or enhancements made to the original TabPaneSkin.

In an ideal scenario, JavaFX could provide an option to disable auto-scrolling altogether...

(For more information, refer to )

Answer 2

The issue lies within the TabPaneSkin class, responsible for converting Tabs into Nodes. Specifically, it needs to adjust the TabHeaderArea's position when its offset exceeds its width. Take a closer look at the scrollToSelectedTab(double selected, double previous) method in the TabHeaderArea class.

To address this issue, one possible solution is to create a custom skin (such as MyTabPaneSkin) based on TabPaneSkin and modify the behavior of the scrollToSelectedTab method. Since most of its members are private, extending the class directly may not be effective.

To implement this workaround, you can override the createDefaultSkin method in the TabPane class like so:

TabPane tabPane = new TabPane(){
    @Override
    protected Skin<?> createDefaultSkin() {
        return new MyTabPaneSkin(this);
    }   
};

Keep in mind that by using a custom skin, you may lose access to any future updates or enhancements made to the original TabPaneSkin.

In an ideal scenario, JavaFX could provide an option to disable auto-scrolling altogether...

(For more information, refer to )

Answer 3

Answer №2

I managed to address this issue by utilizing reflection to access the

TabePaneSkin.TabHeaderArea.setScrollOffset

.

While resorting to reflection may not be ideal, I find it more preferable than rewriting the entire TabPaneSkin.

private static void resetAutomaticScrollingOfTabPaneHeaders(TabPane tabPane) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
    Skin<?> skin = tabPane.getSkin();
    TabPaneSkin tabPaneSkin = (TabPaneSkin) skin;

    // TabePaneSkin.TabHeaderArea
    Node tabHeaderArea = tabPaneSkin.getChildren().get(tabPaneSkin.getChildren().size() - 1); 

    Method setScrollOffset = tabHeaderArea.getClass().getDeclaredMethod("setScrollOffset", double.class);
    setScrollOffset.setAccessible(true);
    setScrollOffset.invoke(tabHeaderArea, 0);
}

You can trigger this method from a width listener as shown below:

widthProperty().addListener((observable, oldValue, newValue) -> {
    try {
        resetAutomaticScrollingOfTabPaneHeaders(this);
    } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
        log.warn("Could not scroll the TabHeaderArea back to the left.", e);
    }
});

Answer 4

I managed to address this issue by utilizing reflection to access the

TabePaneSkin.TabHeaderArea.setScrollOffset

.

While resorting to reflection may not be ideal, I find it more preferable than rewriting the entire TabPaneSkin.

private static void resetAutomaticScrollingOfTabPaneHeaders(TabPane tabPane) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
    Skin<?> skin = tabPane.getSkin();
    TabPaneSkin tabPaneSkin = (TabPaneSkin) skin;

    // TabePaneSkin.TabHeaderArea
    Node tabHeaderArea = tabPaneSkin.getChildren().get(tabPaneSkin.getChildren().size() - 1); 

    Method setScrollOffset = tabHeaderArea.getClass().getDeclaredMethod("setScrollOffset", double.class);
    setScrollOffset.setAccessible(true);
    setScrollOffset.invoke(tabHeaderArea, 0);
}

You can trigger this method from a width listener as shown below:

widthProperty().addListener((observable, oldValue, newValue) -> {
    try {
        resetAutomaticScrollingOfTabPaneHeaders(this);
    } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
        log.warn("Could not scroll the TabHeaderArea back to the left.", e);
    }
});

Answer 5

Answer №3

I successfully updated the code to address the issue of spacing being retained when clicking on the last tab :)

private static void adjustTabPaneHeadersScrolling(TabPane tabPane)
            throws NoSuchMethodException, InvocationTargetException, IllegalAccessException, NoSuchFieldException {
        Skin<?> skin = tabPane.getSkin();
        TabPaneSkin tabPaneSkin = (TabPaneSkin) skin;

        // Finding the TabHeaderArea within TabPaneSkin
        Node tabHeaderArea = tabPaneSkin.getChildren().get(tabPaneSkin.getChildren().size() - 1); 

        // Updating scrollOffsetDirty field
        Field scrollOffsetDirty = tabHeaderArea.getClass().getDeclaredField("scrollOffsetDirty");
        scrollOffsetDirty.setAccessible(true);
        scrollOffsetDirty.setBoolean(tabHeaderArea, false);

        // Calling setScrollOffset method to reset scrolling offset
        Method setScrollOffset = tabHeaderArea.getClass().getDeclaredMethod("setScrollOffset", double.class);
        setScrollOffset.setAccessible(true);
        setScrollOffset.invoke(tabHeaderArea, 0);
    }

Answer 6

I successfully updated the code to address the issue of spacing being retained when clicking on the last tab :)

private static void adjustTabPaneHeadersScrolling(TabPane tabPane)
            throws NoSuchMethodException, InvocationTargetException, IllegalAccessException, NoSuchFieldException {
        Skin<?> skin = tabPane.getSkin();
        TabPaneSkin tabPaneSkin = (TabPaneSkin) skin;

        // Finding the TabHeaderArea within TabPaneSkin
        Node tabHeaderArea = tabPaneSkin.getChildren().get(tabPaneSkin.getChildren().size() - 1); 

        // Updating scrollOffsetDirty field
        Field scrollOffsetDirty = tabHeaderArea.getClass().getDeclaredField("scrollOffsetDirty");
        scrollOffsetDirty.setAccessible(true);
        scrollOffsetDirty.setBoolean(tabHeaderArea, false);

        // Calling setScrollOffset method to reset scrolling offset
        Method setScrollOffset = tabHeaderArea.getClass().getDeclaredMethod("setScrollOffset", double.class);
        setScrollOffset.setAccessible(true);
        setScrollOffset.invoke(tabHeaderArea, 0);
    }

Issue with JavaFX: Unable to remove additional space on the right side of TabPane

Answer №1

Answer №2

Answer №3

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