Scrollbar-size

The scrollbar-size style defines the width of the scrollbars.

Syntax

scrollbar-size: <integer> <integer>;
              # horizontal vertical

scrollbar-size-horizontal: <integer>;
scrollbar-size-vertical: <integer>;

The scrollbar-size style takes two <integer> to set the horizontal and vertical scrollbar sizes, respectively. This customisable size is the width of the scrollbar, given that its length will always be 100% of the container.

The scrollbar widths may also be set individually with scrollbar-size-horizontal and scrollbar-size-vertical.

Examples

Basic usage

In this example we modify the size of the widget's scrollbar to be much larger than usual.

Outputscrollbar_size.pyscrollbar_size.tcss

from textual.app import App
from textual.containers import ScrollableContainer
from textual.widgets import Label

TEXT = """I must not fear.
Fear is the mind-killer.
Fear is the little-death that brings total obliteration.
I will face my fear.
I will permit it to pass over me and through me.
And when it has gone past, I will turn the inner eye to see its path.
Where the fear has gone there will be nothing. Only I will remain.
"""


class ScrollbarApp(App):
    CSS_PATH = "scrollbar_size.tcss"

    def compose(self):
        yield ScrollableContainer(Label(TEXT * 5), classes="panel")


if __name__ == "__main__":
    app = ScrollbarApp()
    app.run()

Screen {
    background: white;
    color: blue 80%;
    layout: horizontal;
}

Label {
    padding: 1 2;
    width: 200;
}

.panel {
    scrollbar-size: 10 4;
    padding: 1 2;
}

Scrollbar sizes comparison

In the next example we show three containers with differently sized scrollbars.

Tip

If you want to hide the scrollbar but still allow the container to scroll using the mousewheel or keyboard, you can set the scrollbar size to 0.

Outputscrollbar_size2.pyscrollbar_size2.tcss

from textual.app import App
from textual.containers import Horizontal, ScrollableContainer
from textual.widgets import Label

TEXT = """I must not fear.
Fear is the mind-killer.
Fear is the little-death that brings total obliteration.
I will face my fear.
I will permit it to pass over me and through me.
And when it has gone past, I will turn the inner eye to see its path.
Where the fear has gone there will be nothing. Only I will remain.
"""


class ScrollbarApp(App):
    CSS_PATH = "scrollbar_size2.tcss"

    def compose(self):
        yield Horizontal(
            ScrollableContainer(Label(TEXT * 5), id="v1"),
            ScrollableContainer(Label(TEXT * 5), id="v2"),
            ScrollableContainer(Label(TEXT * 5), id="v3"),
        )


if __name__ == "__main__":
    app = ScrollbarApp()
    app.run()

ScrollableContainer {
    width: 1fr;
}

#v1 {
    scrollbar-size: 5 1;
    background: red 20%;
}

#v2 {
    scrollbar-size-vertical: 1;
    background: green 20%;
}

#v3 {
    scrollbar-size-horizontal: 5;
    background: blue 20%;
}

CSS

/* Set horizontal scrollbar to 10, and vertical scrollbar to 4 */
scrollbar-size: 10 4;

/* Set horizontal scrollbar to 10 */
scrollbar-size-horizontal: 10;

/* Set vertical scrollbar to 4 */
scrollbar-size-vertical: 4;

Python

The style scrollbar-size has no Python equivalent. The scrollbar sizes must be set independently:

# Set horizontal scrollbar to 10:
widget.styles.scrollbar_size_horizontal = 10
# Set vertical scrollbar to 4:
widget.styles.scrollbar_size_vertical = 4