TdxChartSeriesUnboundDataBinding.ArgumentField Property
Specifies data-related settings of series arguments in unbound mode.
Declaration
property ArgumentField: TdxChartSeriesUnboundField read; write;Property Value
| Type | Description |
|---|---|
| TdxChartSeriesUnboundField | Stores data-related settings of series arguments. |
Remarks
Use the ArgumentField.ValueType or ArgumentField.ValueTypeClass property to change the data type of argument values. The following table lists supported value types and the corresponding property values:
| ValueType[1] Value | ValueTypeClass[2] Value | TFieldType[3] Value | Description |
|---|---|---|---|
'String' |
TcxStringValueType | ftString |
Unicode string values. |
'WideString' |
TcxWideStringValueType | ftWideString |
Wide string values. |
'Smallint' |
TcxSmallintValueType | ftSmallint |
16-bit signed integer values. |
'Integer' |
TcxIntegerValueType | ftInteger |
32-bit signed integer values. |
'Word' |
TcxWordValueType | ftWord |
16-bit unsigned integer values. |
'Boolean' |
TcxBooleanValueType | ftBoolean |
Boolean values. |
'Single' |
TcxSingleValueType | ftSingle |
Single precision floating-point values. |
'Float' |
TcxFloatValueType | ftFloat |
Double precision floating-point values. |
'Currency' |
TcxCurrencyValueType | ftCurrency |
Monetary values. |
'DateTime' |
TcxDateTimeValueType | ftDateTime |
Date and time values. |
'LargeInt' |
TcxLargeIntValueType | ftLargeInt |
64-bit signed integer values. |
'FMTBcd' |
TcxFMTBcdValueType | ftFMTBcd |
Binary-encoded decimal values that can be converted to Currency without a loss of precision. |
'SQLTimeStamp' |
TcxSQLTimeStampValueType | ftTimeStamp[4] |
High-precision date and time values. |
'Variant' |
TcxVariantValueType | ftVariant |
Values of any type. |
'BLOB'[5] |
TcxBLOBValueType | fsBlob |
BLOBs (Binary Large OBjects) as values. BLOB values are most often used for storing files in a database. |
'Object'[6] |
TcxObjectValueType | ftObject |
Values that store non-visual objects (TObject descendant instances) with arbitrary data for an unbound editor or Data Grid item. |
Example
The following code example creates three stacked bar series with identical appearance settings in unbound data access mode:
uses cxDataStorage; // This unit declares the TcxStringValueType class
// ...
var
AXYDiagram: TdxChartXYDiagram;
AXY2018Series, AXY2019Series, AXY2020Series: TdxChartXYSeries;
AStackedBarView: TdxChartXYSeriesStackedBarView;
ADataBinding: TdxChartXYSeriesUnboundDataBinding;
begin
dxChartControl1.BeginUpdate; // Initiates the following batch change
try
AXYDiagram := dxChartControl1.AddDiagram<TdxChartXYDiagram>('DevAV Sales By Region');
AXYDiagram.Title.Appearance.FontOptions.Size := 20;
AXYDiagram.Axes.AxisY.Title.Text := 'Millions of Dollars';
AXYDiagram.Axes.AxisY.Title.Appearance.FontOptions.Size := 14;
AXY2018Series := AXYDiagram.AddSeries('2018'); // Creates a new series with the caption "2018"
// Selects the unbound data access mode
AXY2018Series.DataBindingClass := TdxChartXYSeriesUnboundDataBinding;
ADataBinding := AXY2018Series.DataBinding as TdxChartXYSeriesUnboundDataBinding;
// Selects the string data type for arguments
ADataBinding.ArgumentField.ValueTypeClass := TcxStringValueType;
AXY2018Series.ViewClass := TdxChartXYSeriesStackedBarView; // Selects the Stacked Bar series View
AStackedBarView := AXY2018Series.View as TdxChartXYSeriesStackedBarView;
AStackedBarView.ValueLabels.Visible := True; // Displays value labels on bars
AStackedBarView.ValueLabels.TextFormat := '{V:0.000}'; // Changes the number display format
AStackedBarView.ValueLabels.Appearance.FontOptions.Bold := True;
AXY2018Series.Points.Add('Asia', 4.2372);
AXY2018Series.Points.Add('Australia', 1.7871);
AXY2018Series.Points.Add('Europe', 3.0884);
AXY2018Series.Points.Add('North America', 3.4855);
AXY2018Series.Points.Add('South America', 1.6027);
AXY2019Series := AXYDiagram.AddSeries; // Creates a new series with the default settings
AXY2019Series.AssignFrom(AXY2018Series); // Copies all settings from the "2018" series
AXY2019Series.Caption := '2019'; // Defines a different series caption
AXY2019Series.Points.Add('Asia', 4.7685);
AXY2019Series.Points.Add('Australia', 1.9576);
AXY2019Series.Points.Add('Europe', 3.3579);
AXY2019Series.Points.Add('North America', 3.7477);
AXY2019Series.Points.Add('South America', 1.8237);
AXY2020Series := AXYDiagram.AddSeries('2020'); // Creates a new series with the default settings
AXY2020Series.AssignFrom(AXY2018Series); // Copies all settings from the "2018" series
AXY2020Series.Caption := '2020'; // Defines a different series caption
AXY2020Series.Points.Add('Asia', 5.289);
AXY2020Series.Points.Add('Australia', 2.2727);
AXY2020Series.Points.Add('Europe', 3.7257);
AXY2020Series.Points.Add('North America', 4.1825);
AXY2020Series.Points.Add('South America', 2.1172);
finally
dxChartControl1.EndUpdate; // Calls EndUpdate regardless of the batch operation's success
end;
end;
Footnotes
-
The ValueType property setter updates the ValueTypeClass property according to the assigned value.
-
The ValueTypeClass property setter updates the ValueType property according to the assigned value.
-
This column lists the corresponding TFieldType values.
-
'SQLTimeStamp'also corresponds to the TSQLTimeStamp type. -
Use this value type with those controls and editors that support BLOB.
-
Use this type only in custom or inherited components because DevExpress and standard VCL components have no information on actual content of such values.
See Also