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NextGrid .NET

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Related Articles:

NxComboBox has three new styles placed inside DisplayMode property called dmNameList, dmValueList and dmIdentList.

These three new styles do not allow editing of the text just like the dsDropDownList style.

What makes them different from the dsDropDownList style is that they use the Name=Value feature of TStrings.

Example:

clBlue=Blue
clGreen=Green
clYellow=Yellow

Both dmNameList and dmValueList are ment to implement lookup functionality with an NxComboBox.

Table 1: DisplayMode property

Name	Meaning
dmNameList	Displays the Names array of Items property.
dmValueList	Displays the Values array of the Items property.

Both these lists styles let you retrieve the Name and Value of the chosen item through two new properties called ItemName and ItemValue.



Figure 1: Example of the dmNameList style.



Figure 2: Example of the dmValueList style.

The last new NxComboBox style called dmIdentList expects a numericall Name part of the Name=Value pairs and uses the Name part as Ident level for the NxComboBox Items. The result is that a simple tree-like structure is shown in the DropDownList.

The ItemName returns the IdentLevel of the chosen item and ItemValue returns the chosen item without leading spaces.



Figure 3: Example of the dmIdentList.

Notes:

1. The ItemValue and ItemName are undefined for the dsDropDown and dsDropDownList styles.
2. The results are also undefined for duplicate names just like the behaviour of the TString implementation.