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/// Tooltip overlay for candlestick charts with bisect hit-testing on timestamp
use leptos::prelude::*;
use lodviz_core::core::data::OhlcBar;
use lodviz_core::core::scale::{LinearScale, Scale};
use lodviz_core::core::theme::Margin;
/// Tooltip overlay for candlestick / OHLC charts
#[component]
pub fn CandlestickTooltip(
/// Visible OHLC bars (sorted by timestamp, already downsampled if needed)
bars: Memo<Vec<OhlcBar>>,
/// X scale mapping timestamp → pixel x
x_scale: Memo<LinearScale>,
/// Y scale mapping price → pixel y (unused for hit-test but passed for completeness)
#[allow(unused)]
y_scale: Memo<LinearScale>,
/// Pixel width of each candlestick body (for highlight rect)
bar_pixel_width: Memo<f64>,
/// Inner width of the chart area
inner_width: Memo<f64>,
/// Inner height of the chart area
inner_height: Memo<f64>,
/// 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)>);
// Bisect: find the bar whose timestamp is closest to the mouse x
let hovered_idx = Memo::new(move |_| {
let (mx, _) = mouse_pos.get()?;
let xs = x_scale.get();
let data_x = xs.inverse(mx);
let all_bars = bars.get();
if all_bars.is_empty() {
return None;
}
let idx = all_bars.partition_point(|b| b.timestamp < data_x);
let best = if idx == 0 {
0
} else if idx >= all_bars.len() {
all_bars.len() - 1
} else {
let dl = (all_bars[idx - 1].timestamp - data_x).abs();
let dr = (all_bars[idx].timestamp - data_x).abs();
if dl <= dr {
idx - 1
} else {
idx
}
};
Some(best)
});
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 (pointer-events disabled)
{move || {
let idx = hovered_idx.get()?;
let (mx, my) = mouse_pos.get()?;
let all_bars = bars.get();
let bar = all_bars.get(idx)?;
let xs = x_scale.get();
let w = inner_width.get();
let h = inner_height.get();
let bpw = bar_pixel_width.get();
let bar_cx = xs.map(bar.timestamp);
let hl_x = bar_cx - bpw / 2.0;
let is_bullish = bar.is_bullish();
let badge_color = if is_bullish { "#26a69a" } else { "#ef5350" };
let badge_text = if is_bullish { "▲ Bullish" } else { "▼ Bearish" };
let delta = bar.close - bar.open;
let pct = if bar.open.abs() > f64::EPSILON { delta / bar.open * 100.0 } else { 0.0 };
let box_w = 175.0_f64;
let box_h = 90.0_f64;
let padding = 8.0_f64;
let row_h = 16.0_f64;
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(
// Vertical highlight centered on the candlestick
// Badge color and text
// Delta and percentage
// Tooltip box sizing
// Auto-flip near edges
view! {
<g class="candlestick-tooltip-overlay" style="pointer-events: none;">
// Vertical highlight band
<rect
x=format!("{hl_x:.2}")
y="0"
width=format!("{bpw:.2}")
height=format!("{h:.2}")
fill="white"
opacity="0.2"
/>
// 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()
/>
// Left color stripe
<rect
x=format!("{box_x:.2}")
y=format!("{box_y:.2}")
width="3"
height=box_h
rx="4"
fill=badge_color
/>
// Header row: bar index + badge
<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"
>
{format!("Bar #{idx}")}
</text>
<text
x=format!("{:.2}", box_x + box_w - padding)
y=format!("{:.2}", box_y + padding + 12.0)
font-size="10"
fill=badge_color
font-family="'JetBrains Mono', monospace"
text-anchor="end"
>
{badge_text}
</text>
// O / C row
<text
x=format!("{:.2}", box_x + padding)
y=format!("{:.2}", box_y + padding + 12.0 + row_h)
font-size="10"
fill="#ddd"
font-family="'JetBrains Mono', monospace"
>
{format!("O: {:.2} C: {:.2}", bar.open, bar.close)}
</text>
// H / L row
<text
x=format!("{:.2}", box_x + padding)
y=format!("{:.2}", box_y + padding + 12.0 + row_h * 2.0)
font-size="10"
fill="#ddd"
font-family="'JetBrains Mono', monospace"
>
{format!("H: {:.2} L: {:.2}", bar.high, bar.low)}
</text>
// Δ row
<text
x=format!("{:.2}", box_x + padding)
y=format!("{:.2}", box_y + padding + 12.0 + row_h * 3.0)
font-size="10"
fill=badge_color
font-family="'JetBrains Mono', monospace"
>
{format!("Δ: {:+.2} ({:+.1}%)", delta, pct)}
</text>
</g>
},
)
}}
}
}