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feat(market): loading spinner while the price chart fetches (pair switches)

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Switching exchange pairs (or first load) briefly leaves the chart with no series
while the venue's candles fetch, which showed the bare "No price history
available" empty state. When a chart fetch is in flight — App::isMarketChartLoading()
(the CoinGecko aggregate OR the per-exchange fetch) — draw a spinner + animated
"Loading price history…" in the plot area instead; the "no history" text only
shows when genuinely empty and idle. New i18n key market_chart_loading across all
8 languages. Verified via a forced-state render (spinner + label centered).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
DanS
2026-07-12 09:38:44 -05:00
parent d1ff58c374
commit a107fda9b8
13 changed files with 40 additions and 5 deletions
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27
src/ui/windows/market_tab.cpp
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@@ -1605,11 +1605,28 @@ static void mktDrawPriceChart(const MktCtx& cx)
}
} else {
// Empty state, centered in the plot area (the interval strip + refresh are already drawn).
const char* msg = TR("market_no_history");
ImVec2 ts = sub1->CalcTextSizeA(sub1->LegacySize, FLT_MAX, 0, msg);
dl->AddText(sub1, sub1->LegacySize,
ImVec2(chartMin.x + (availWidth - ts.x) * 0.5f, (plotTop + plotBottom) * 0.5f - ts.y * 0.5f),
OnSurfaceDisabled(), msg);
const float dp = Layout::dpiScale();
const float ecx = chartMin.x + availWidth * 0.5f;
const float ecy = (plotTop + plotBottom) * 0.5f;
if (app->isMarketChartLoading()) {
// A fetch is in flight — e.g. just switched exchange pairs. Show a spinner + animated label
// instead of "no history", since the data is on its way.
const float r = 10.0f * dp;
const float t = (float)ImGui::GetTime() * 4.5f; // rotate ~0.7 rev/s
dl->PathArcTo(ImVec2(ecx, ecy - 8.0f * dp), r, t, t + IM_PI * 1.5f, 24);
dl->PathStroke(OnSurfaceMedium(), false, 2.5f * dp);
char lb[80];
snprintf(lb, sizeof(lb), "%s%s", TR("market_chart_loading"), LoadingDots());
ImVec2 ts = capFont->CalcTextSizeA(capFont->LegacySize, FLT_MAX, 0, lb);
dl->AddText(capFont, capFont->LegacySize,
ImVec2(ecx - ts.x * 0.5f, ecy + 10.0f * dp), OnSurfaceMedium(), lb);
} else {
const char* msg = TR("market_no_history");
ImVec2 ts = sub1->CalcTextSizeA(sub1->LegacySize, FLT_MAX, 0, msg);
dl->AddText(sub1, sub1->LegacySize,
ImVec2(chartMin.x + (availWidth - ts.x) * 0.5f, ecy - ts.y * 0.5f),
OnSurfaceDisabled(), msg);
}
}
ImGui::SetCursorScreenPos(ImVec2(chartMin.x, chartMin.y + chartH));