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Panes

Indicator panes can be resized by dragging their lower edge and reordered by dragging their legend row:

KChartWidget(
  candles,
  ChartColors(),
  timeFrame: const Duration(minutes: 15),
  indicators: [MacdIndicator(), RsiIndicator()],
  resizablePanes: true,
  reorderablePanes: true,
  onReorderPane: (from, to) => setState(() {
    indicators.insert(to, indicators.removeAt(from));
  }),
);

Scales and guides

Each pane has its own gridlines and labels at round values, so panes such as ATRs with different periods can be compared directly.
Indicators with a fixed range (RSI, KDJ, WR) show their guide levels instead.
MACD and Awesome Oscillator panes draw a zero line.
The volume pane shows a round reference level.

Height and order

Pane heights are managed by the chart, constrained between ChartStyle.minPaneHeight and maxPaneHeight, and reset when the set of panes changes.

Pane order is owned by your indicator list. The chart reports the move through onReorderPane, and your code applies it.

ChartStyle.paneResizeTolerance and paneGrabHeight set the size of the resize and reorder hit areas.

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