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Render tooltips pointing up or down relative to the datapoint clicked #6

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Render tooltips pointing up or down relative to the datapoint clicked #6

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42 changes: 29 additions & 13 deletions lib/plox.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -314,23 +314,39 @@ defmodule Plox do
slot :inner_block, required: true

def tooltip(assigns) do
height = assigns.dataset.dimensions.height
point = GraphDataset.to_graph_point(assigns.dataset, assigns.x, assigns.y, assigns.point_id)

assigns =
assign(assigns, point: point)
{container_classes, pointer_classes} =
if point.y < height / 2 do
# top half of the graph: draw tooltip BELOW the clicked point
{"top: #{point.y + 12}px;", "top: -0.5rem;"}
else
# bottom half of the graph: draw tooltip ABOVE the clicked point
{"bottom: #{height - point.y + 12}px;", "bottom: -0.5rem;"}
end

assigns = assign(assigns, point: point, container_classes: container_classes, pointer_classes: pointer_classes)

~H"""
<div
style={[
"position: absolute; padding: 1rem; font-size: 0.75rem; background: #4B4C4D; color: #CACBCC; z-index: 10; border-radius: 0.75rem; transform: translate(-50%);",
"left: #{@point.x}px; bottom: #{@dataset.dimensions.height - @point.y + 12}px;",
"box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);"
]}
phx-click-away={assigns[:"phx-click-away"]}
phx-target={assigns[:"phx-target"]}
>
<%= render_slot(@inner_block, @point.data_point.original) %>
<div style="transform: translate(-50%) rotate(45deg); position: absolute; left: 50%; bottom: -0.5rem; width: 1rem; height: 1rem; z-index: -10; background: #4B4C4D" />
<div style={[
"position: absolute; left: #{@point.x}px; transform: translate(-50%);",
@container_classes
]}>
<div
style={[
"position: relative; padding: 1rem; font-size: 0.75rem; background: #4B4C4D; color: #CACBCC; z-index: 10; border-radius: 0.75rem;",
"box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);"
]}
phx-click-away={assigns[:"phx-click-away"]}
phx-target={assigns[:"phx-target"]}
>
<%= render_slot(@inner_block, @point.data_point.original) %>
</div>
<div style={[
"position: absolute; left: 50%; transform: translate(-50%) rotate(45deg); width: 1rem; height: 1rem; z-index: -10; background: #4B4C4D;",
@pointer_classes
]} />
</div>
"""
end
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