Class tcustomlbdropdownlistcontroller

Unit

msedbedit

Declaration

type tcustomlbdropdownlistcontroller = class(texterndatadropdownlistcontroller, ilookupbufferfieldinfo)

Description

The *lb edit widgets (e.g. tdbenumeditlb) fetch their dropdown values from a lookupbuffer — fast, with no side effect on other components — as opposed to their non-lb tdb* counterparts, which fetch values directly from a tdataset by locate (slower, and moves the dataset's cursor).

Hierarchy

• TObject
• tpersistent
• tvirtualpersistent
• tnullinterfacedpersistent
• tlinkedpersistent
• teventpersistent
• tcustomdropdowncontroller
• tcustomdropdownlistcontroller
• texterndatadropdownlistcontroller
• tcustomlbdropdownlistcontroller

Overview

Methods

Protected	procedure dofilter(var recno: integer; var accept: boolean); override;
Protected	function reloadlist: integer; override;
Protected	function createdropdownlist: tdropdownlist; override;
Protected	function candropdown: boolean; override;
Protected	procedure itemselected(const index: integer; const akey: keyty); override;
Protected	procedure objectevent(const sender: tobject; const event: objecteventty); override;
Protected	function getremoterowcount: integer; override;
Protected	function getlbdatakind(const apropname: string): lbdatakindty;
Protected	function getlookupbuffer: tcustomlookupbuffer;

Properties

Public	property optionslb: optionslbty read foptionslb write foptionslb default [];
Public	property cols: tlbdropdowncols read getcols write setcols;
Public	property lookupbuffer: tcustomlookupbuffer read flookupbuffer write setlookupbuffer;
Public	property keyfieldno: lookupbufferfieldnoty read fkeyfieldno write fkeyfieldno default 0;
Public	property onfilter: lbfiltereventty read fonfilter write fonfilter;
Public	property onbeforefilter: dataediteventty read fonbeforefilter write fonbeforefilter;

Description

Methods

Protected	procedure dofilter(var recno: integer; var accept: boolean); override;
This item has no description.

Protected	function reloadlist: integer; override;
This item has no description.

Protected	function createdropdownlist: tdropdownlist; override;
This item has no description.

Protected	function candropdown: boolean; override;
This item has no description.

Protected	procedure itemselected(const index: integer; const akey: keyty); override;
This item has no description.

Protected	procedure objectevent(const sender: tobject; const event: objecteventty); override;
This item has no description.

Protected	function getremoterowcount: integer; override;
This item has no description.

Protected	function getlbdatakind(const apropname: string): lbdatakindty;
This item has no description.

Protected	function getlookupbuffer: tcustomlookupbuffer;
This item has no description.

Properties

Public	property optionslb: optionslbty read foptionslb write foptionslb default [];
This item has no description.

Public	property cols: tlbdropdowncols read getcols write setcols;
This item has no description.

Public	property lookupbuffer: tcustomlookupbuffer read flookupbuffer write setlookupbuffer;
This item has no description.

Public	property keyfieldno: lookupbufferfieldnoty read fkeyfieldno write fkeyfieldno default 0;
Index into lookupbuffer.integerfields for an enumeditlb widget, or into lookupbuffer.textfields for a keystringeditlb widget. The same lookupbuffer can serve several edit widgets, even with different keyfieldno.

Public	property onfilter: lbfiltereventty read fonfilter write fonfilter;
This item has no description.

Public	property onbeforefilter: dataediteventty read fonbeforefilter write fonbeforefilter;
This item has no description.

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