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/// Tooltip component for bar charts with categorical hit-testing
///
/// Uses `BandScale` to determine which category is hovered,
/// then shows all visible series values for that category.
/// Supports grouped and stacked modes (with percentages and total).
use leptos::prelude::*;
use lodviz_core::core::scale::{BandScale, LinearScale};
use lodviz_core::core::theme::Margin;
use crate::components::charts::bar_chart::{BarMode, BarOrientation};
/// Series info passed to the bar tooltip
#[derive(Clone, Debug, PartialEq)]
pub struct BarTooltipSeries {
/// The name of the series (used as row label in the tooltip)
pub name: String,
/// The values for each category index
pub values: Vec<f64>,
/// The color of the series
pub color: String,
/// Whether the series is currently visible
pub visible: bool,
}
/// Tooltip overlay for bar charts (categorical axis)
#[component]
pub fn BarTooltip(
/// Category labels
categories: Memo<Vec<String>>,
/// Series information (name, values, color, visibility)
series_info: Memo<Vec<BarTooltipSeries>>,
/// Band scale for the categorical axis
band_scale: Memo<BandScale>,
/// Linear scale for the value axis
#[allow(unused)]
value_scale: Memo<LinearScale>,
/// Inner width of the chart area
inner_width: Memo<f64>,
/// Inner height of the chart area
inner_height: Memo<f64>,
/// Bar orientation
orientation: BarOrientation,
/// Bar mode (grouped or stacked)
mode: BarMode,
/// Chart margins (to correct SVG offset coordinates)
margin: Memo<Margin>,
/// Tooltip background color
#[prop(into, optional)]
tooltip_bg: Option<Signal<String>>,
/// Tooltip text color
#[prop(into, optional)]
tooltip_text: Option<Signal<String>>,
) -> impl IntoView {
let tooltip_bg = move || {
tooltip_bg
.map(|s| s.get())
.unwrap_or_else(|| "rgba(0,0,0,0.85)".to_string())
};
let tooltip_text = move || {
tooltip_text
.map(|s| s.get())
.unwrap_or_else(|| "#ffffff".to_string())
};
let (mouse_pos, set_mouse_pos) = signal(None::<(f64, f64)>);
// Determine which category index is hovered
let hovered_category = Memo::new(move |_| {
let (mx, my) = mouse_pos.get()?;
let bs = band_scale.get();
let (r0, r1) = bs.range();
let step = bs.step();
if step <= 0.0 {
return None;
}
let coord = match orientation {
BarOrientation::Vertical => mx,
BarOrientation::Horizontal => my,
};
let range_min = r0.min(r1);
let range_max = r0.max(r1);
if coord < range_min || coord > range_max {
return None;
}
let idx = ((coord - range_min) / step).floor() as usize;
let n = bs.len();
if n == 0 {
return None;
}
Some(idx.min(n - 1))
});
// Build tooltip data for the hovered category
let tooltip_data = Memo::new(move |_| {
let ci = hovered_category.get()?;
let cats = categories.get();
let series = series_info.get();
let cat_name = cats.get(ci)?.clone();
let visible_entries: Vec<(String, f64, String)> = series
.iter()
.filter(|s| s.visible)
.map(|s| {
let val = s.values.get(ci).copied().unwrap_or(0.0);
(s.name.clone(), val, s.color.clone())
})
.collect();
if visible_entries.is_empty() {
return None;
}
let total: f64 = visible_entries.iter().map(|(_, v, _)| v).sum();
Some((cat_name, visible_entries, total))
});
view! {
// Transparent overlay to capture mouse events
<rect
width=move || inner_width.get()
height=move || inner_height.get()
fill="transparent"
style="pointer-events: all;"
on:mousemove=move |ev| {
let m = margin.get();
let x = ev.offset_x() as f64 - m.left;
let y = ev.offset_y() as f64 - m.top;
set_mouse_pos.set(Some((x, y)));
}
on:mouseleave=move |_| {
set_mouse_pos.set(None);
}
/>
// Tooltip rendering
{move || {
let (cat_name, entries, total) = tooltip_data.get()?;
let ci = hovered_category.get()?;
let (mx, my) = mouse_pos.get()?;
let bs = band_scale.get();
let w = inner_width.get();
let h = inner_height.get();
let is_stacked = mode == BarMode::Stacked;
let (hl_x, hl_y, hl_w, hl_h) = match orientation {
BarOrientation::Vertical => {
let x = bs.map_index(ci);
let bw = bs.band_width();
(x, 0.0, bw, h)
}
BarOrientation::Horizontal => {
let y = bs.map_index(ci);
let bw = bs.band_width();
(0.0, y, w, bw)
}
};
let n_rows = entries.len();
let box_w: f64 = if is_stacked { 170.0 } else { 140.0 };
let header_h = 18.0;
let row_h = 16.0;
let footer_h = if is_stacked { 18.0 } else { 0.0 };
let padding = 8.0;
let box_h = padding * 2.0 + header_h + n_rows as f64 * row_h + footer_h;
let box_x = if mx + box_w + 10.0 > w { mx - box_w - 10.0 } else { mx + 10.0 };
let box_y = if my + box_h + 10.0 > h { my - box_h - 10.0 } else { my + 10.0 };
Some(
// Highlight band
// Tooltip box sizing
// Position follows mouse with edge flip
view! {
<g class="bar-tooltip-overlay" style="pointer-events: none;">
// Category band highlight
<rect
x=format!("{hl_x:.2}")
y=format!("{hl_y:.2}")
width=format!("{hl_w:.2}")
height=format!("{hl_h:.2}")
fill="white"
opacity="0.15"
/>
// Tooltip box background
<rect
x=format!("{box_x:.2}")
y=format!("{box_y:.2}")
width=box_w
height=box_h
rx="4"
fill=tooltip_bg()
/>
// Header: category name
<text
x=format!("{:.2}", box_x + padding)
y=format!("{:.2}", box_y + padding + 12.0)
font-size="11"
fill=tooltip_text()
font-family="'JetBrains Mono', monospace"
font-weight="bold"
>
{cat_name}
</text>
// Series rows
{entries
.iter()
.enumerate()
.map(|(i, (name, val, color))| {
let ty = box_y + padding + header_h + 12.0 + i as f64 * row_h;
let label = if is_stacked && total > 0.0 {
let pct = val / total * 100.0;
format!("{name}: {val:.1} ({pct:.0}%)")
} else {
format!("{name}: {val:.1}")
};
view! {
<g>
<circle
cx=format!("{:.2}", box_x + padding + 4.0)
cy=format!("{:.2}", ty - 3.0)
r="4"
fill=color.clone()
/>
<text
x=format!("{:.2}", box_x + padding + 12.0)
y=format!("{ty:.2}")
font-size="10"
fill=tooltip_text()
font-family="'JetBrains Mono', monospace"
>
{label}
</text>
</g>
}
})
.collect_view()}
// Footer for stacked: total
{if is_stacked {
let footer_y = box_y + padding + header_h + n_rows as f64 * row_h
+ 14.0;
Some(
view! {
<text
x=format!("{:.2}", box_x + padding)
y=format!("{footer_y:.2}")
font-size="10"
fill="#aaa"
font-family="'JetBrains Mono', monospace"
>
{format!("Total: {total:.1}")}
</text>
},
)
} else {
None
}}
</g>
},
)
}}
}
}