![[property icon]](bitmaps/browsetool21.png)
DropDown
DropDown
DropDown
Used to set the DBEdit control to act as a regular edit control or as a drop down list box
Enumerated type, possible values are:
| Default | Grid default rules |
|---|---|
| DropFocus | The control will have a drop down list but the down arrow used to signify that the control has drop down capabilities is not displayed until the control gets focus |
| DropEnabled | The control can have a drop down list but the down arrow used to signify that is only displayed if the control is enabled |
| DropAlways | The control will display the down arrow at all times |
Applies to: KCMLEdit
DropDown
Determines if a dropdown list is enabled
Enumerated type, possible values are:
| Default | Grid default rules apply |
|---|---|
| NoDrop | Act as a standard Edit control with no drop down capabilities |
| DropFocus | The control will have a drop down list but the down arrow used to signify that the control has drop down capabilities is not displayed until the control gets focus |
| DropEnabled | The control can have a drop down list but the down arrow used to signify that is only displayed if the control is enabled |
| DropAlways | The control will display the down arrow at all times |
![[event icon]](bitmaps/browsetool20.png)
DropDown() Event
Called before the drop down portion of the control is displayed
Applies to: ComboBox , KCMLEdit
DropDown() Event
Called before the drop down portion of the control is displayed
Applies to: Grid
Introduced in KCML version 5.02
The DropDown enumerated property is used to instruct the control to act as either a regular edit control or as a drop down list box. This property is a design time only property and can not therefore be changed under program control.
The DropDown() event is called when the drop down section of an edit control is revealed by clicking the dropdown arrow. This allows the drop down list to be filled on demand rather than filling all drop down control before the form is displayed. The DropStyle property must be set accordingly to enable the drop down section of the control.
If the DropDownFilled property is TRUE then this event handler will be ignored so once the list has been filled the event handler should set this property to TRUE so that it won't be called again.
Note that when an edit cell is created in a grid, KCML searches the cell, then the row, then the col and finally the grid for a listbox to use. Just setting the DropDown and DropStyle properties is not sufficient as it will not be known which list to use. Any action that affects the list may be used to instantiate the list, such as setting the DropDown property or adding items to the list using the Add() method.
REM Set up column 5 to have a drop down list .gridControl1.Cell(0, 5).DropDown = &.DropAlways .gridControl1.Cell(0, 5).DropStyle = &.DropDown REM Force a list to be created for the column .gridControl1.Cell(0, 5).DropDownFilled = FALSE REM The first time a drop down in this column is selected, the DropDown REM event will be triggered. CursorCol will be 5 and so we will REM be able to fill in the drop down contents.