Feedback: slider handle shifting.

[Aadil127]

slider.mp4

Bottom 3 sliders are showing bounds for widget, rail and handle.

---

This adds handle bounds that can be configured while creating slider widget.

To prevent issues for slider widget used in many cosmic application i have set default bounds for handle as defined in theme for slider. ( libcosmic/src/theme/style/iced.rs:755 )

Color picker widget's slider needs to update as it has custom style for slider handle
(without changes slider rail width will be slightly smaller)

Currently nothing is overflowing outside of widget layout.

Need feed back on this approach.

[Aadil127]

renderer.fill_quad(
    renderer::Quad {
        bounds: Rectangle {
            x: bounds.x + offset,
            y: rail_y + 6.0,
            width: BREAKPOINT_WIDTH,
            height: 8.0_f32
                .min(bounds.y + bounds.height - (rail_y + 6.0)),
        },
        border: Border {
            radius: 0.0.into(),
            width: 0.0,
            color: Color::TRANSPARENT,
        },
        ..renderer::Quad::default()
    },
    crate::core::Background::Color(style.breakpoint.color),
);

Currently it also stops breakpoints from going outside of widget bounds.
Do we want this or have consistent height for breakpoints even if it makes it overflow if height of widget is small?

[Aadil127]

I have just seen that in the upstream iced they are only using width for rectangle handle shape and height of handle is same as widget's height. Do i go with that approach?
(I am leaning towards approach taken in upstream iced)
I think i will not change my approach if i removed handle height and made handle height same as widget's than breakpoints will become smaller and breakpoint will be hidden if handle is on top of that.