ChartDirector 6.0 (C++ Edition)

QChartViewer.needUpdateChart


Usage

bool needUpdateChart();

Description

Determines if the current viewPortChanged signal requires chart update.

The signal handler for a QChartViewer.viewPortChanged signal can use this method to determine if chart update is necessary.

This method is only valid during handling of the viewPortChanged signal. Its behaviour is undefined at other times.

Arguments

None

Return Value

A boolean value that indicates if the viewPortChanged signal requires chart update.