HCandlestickModelMapper QML Type

Horizontal model mapper for a candlestick series. More...

• List of all members, including inherited members

Properties

• closeColumn : int
• firstSetRow : int
• highColumn : int
• lastSetRow : int
• lowColumn : int
• model : QAbstractItemModel
• openColumn : int
• series : CandlestickSeries
• timestampColumn : int

Detailed Description

Model mappers enable using a data model derived from the QAbstractItemModel class as a data source for a chart. A horizontal model mapper is used to create a connection between a data model and CandlestickSeries, so that each row in the data model defines a candlestick item and each column maps to the open, high, low, close, and timestamp values of the candlestick item.

Both model and candlestick series properties can be used to manipulate the data. The model mapper keeps the candlestick series and the data model in sync.

The model mapper ensures that all the candlestick items in the candlestick series have equal sizes. Therefore, adding or removing a value from a candlestick item causes the same change to be made in all the candlestick items in the candlestick series.

The following QML example creates a candlestick series with three candlestick items (assuming the model has at least four rows). Each candlestick item contains data defined by the timestamp, open, high, low, and close columns. The name of an item is defined by the vertical header of the row.

 CandlestickSeries {
     HCandlestickModelMapper {
         model: myCustomModel // QAbstractItemModel derived implementation
         timestampColumn: 1
         openColumn: 2
         highColumn: 3
         lowColumn: 4
         closeColumn: 5
         firstSetRow: 1
         lastSetRow: 3
     }
 }

See also CandlestickSeries, CandlestickSet, and VCandlestickModelMapper.

Property Documentation