Combo Box (PRIM_CMBX)
Drop down list of values
Ancestors - Control (PRIM_CTRL)Object (PRIM_OBJT)
Details
A combo box or dropdown is a list based control that when clicked expands to show the list of available values. Depending on configuration, a combo can also allow data entry in the edit portion of the control. When an item is chosen from the combo, the field values associated with underlying list entry will be returned to the parent component.
Example
Simple 2 column combo
Function Options(*DIRECT)
Begin_Com Role(*EXTENDS #PRIM_FORM) Height(284) Left(196) Top(211) Width(549) Clientwidth(533) Clientheight(245)
Define_Com Class(#PRIM_CMBX) Name(#ComboBox) Componentversion(1) Displayposition(1) Fixedheight(False) Left(128) Parent(#COM_OWNER) Showselection(False) Showselectionhilight(False) Tabposition(1) Top(40) Height(37) Width(272) Comboboxstyle(DropDownList)
Define_Com Class(#PRIM_CBCL) Name(#CBCL1) Displayposition(1) Parent(#ComboBox) Source(#xDemoAlpha128) Usepicklist(False)
Define_Com Class(#PRIM_CBCL) Name(#CBCL2) Displayposition(2) Parent(#ComboBox) Source(#xDemoNumber) Usepicklist(False)
Evtroutine Handling(#Com_owner.CreateInstance)
#Com_owner.AddEntry( 1 "One" )
#Com_owner.AddEntry( 2 "Two" )
#Com_owner.AddEntry( 3 "Three" )
#Com_owner.AddEntry( 4 "Four" )
#Com_owner.AddEntry( 5 "Five" )
Endroutine
Mthroutine Name(AddEntry)
Define_Map For(*input) Class(#xDemoNumber) Name(#Value)
Define_Map For(*input) Class(#xDemoAlpha128) Name(#Caption)
#xDemoNumber := #Value
#xDemoAlpha128 := #Caption
Add_Entry To_List(#ComboBox)
Endroutine
Evtroutine Handling(#ComboBox.ItemGotFocus)
#Com_owner.Caption := #xDemoAlpha128
Endroutine
End_Com
Properties
| Name | Description |
|---|---|
| AutoSelect | Automatically select the text when the control receives focus |
| AutoSelectItem | Automatically select the first item when the list is loaded |
| BusyUpdates | BusyUpdates specifies how the control updates itself Inherited from Control (PRIM_CTRL) |
| BusyUpdatesOfParent | BusyUpdatesOfParent specifies whether the parent controls updates Inherited from Control (PRIM_CTRL) |
| CanFocus | CanFocus returns a value indicating whether the control can receive keyboard focus Inherited from Control (PRIM_CTRL) |
| Cell | Reference to a specific cell in the list |
| Columns | Collection of columns in the list |
| ComboBoxStyle | Determines the type of combo box used |
| ComponentClassName | ComponentClassName is the name of the component's class. Inherited from Object (PRIM_OBJT) |
| ComponentMembers | ComponentMembers provides access to all the member components of this component Inherited from Object (PRIM_OBJT) |
| ComponentPatternName | ComponentPatternName is used to qualify the class of the component. Inherited from Object (PRIM_OBJT) |
| ComponentTag | Generic space allowing a value to be stored for the instance Inherited from Object (PRIM_OBJT) |
| ComponentType | ComponentType gives you access to the type information about the component Inherited from Object (PRIM_OBJT) |
| ComponentTypeName | ComponentTypeName is the fully qualified name of the component's class. Inherited from Object (PRIM_OBJT) |
| ComponentVersion | Variant of the control being used |
| CurrentItem | The last item in the list touched either in the UI or via a list related command |
| Cursor | Cursor sets the cursor image Inherited from Control (PRIM_CTRL) |
| DataClass | Reference to a repository field or fundamental product data class used to control data entry |
| DisplayPosition | DisplayPosition determines the order in which components are shown Inherited from Control (PRIM_CTRL) |
| DragStyle | DragStyle determines how a component can be dragged Inherited from Control (PRIM_CTRL) |
| DropDownCount | DropDownCount sets the number of items shown |
| DropDownOpen | Is the combo box open |
| DropDownWidth | The width of the drop down as a percentage of the width property. |
| Enabled | Enable activates/deactivates the component Inherited from Control (PRIM_CTRL) |
| Entries | The number of entries in the underlying data list |
| FixedHeight | Set the height of combo automatically based on the text height |
| FixedPosition | Fix the control position so that it does not move if the parent is scrolled Inherited from Control (PRIM_CTRL) |
| Focus | Focus tells whether the component has focus Inherited from Control (PRIM_CTRL) |
| FocusedStyle | Reference to a style to be applied when the control is focus Inherited from Control (PRIM_CTRL) |
| FocusedStyles | Collection of styles to be applied when the control is focus Inherited from Control (PRIM_CTRL) |
| FocusItem | Reference to the focus item in the list |
| Handle | Returns the Windows handle in desktop applications Inherited from Control (PRIM_CTRL) |
| HasSelection | True if some of the editable text is selected |
| Height | The height of the control in pixels Inherited from Control (PRIM_CTRL) |
| Hint | Caption displayed when the mouse hovers over the control Inherited from Control (PRIM_CTRL) |
| HintPopup | HintPopup allows a PopupPanel instance to be used instead of the default hint text box Inherited from Control (PRIM_CTRL) |
| HintShow | Enabled or disable the appearance of hints Inherited from Control (PRIM_CTRL) |
| HintShowOfParent | Delegate hints appearance to the parent control Inherited from Control (PRIM_CTRL) |
| HintTitle | HintTitle defines the text shown at the top of the hint window in emphasized text Inherited from Control (PRIM_CTRL) |
| IntegralHeight | Determines how the last visible item in a list is shown |
| IsAnimating | IsAnimating indicates that a control is currently being animated Inherited from Control (PRIM_CTRL) |
| IsRealized | True if the control is currently realized Inherited from Control (PRIM_CTRL) |
| Items | Collection of items in the component |
| Left | Position of the control relative to the left boundary of its parent Inherited from Control (PRIM_CTRL) |
| MessageSet | LANSA Internal Use |
| MessagesOfComponent | LANSA Internal Use |
| MessagesOfFeature | LANSA Internal Use |
| Modified | Modified indicates that the contents of the component have changed Inherited from Control (PRIM_CTRL) |
| ModifiedRules | Controls when the Modified property is set to True |
| MouseOver | MouseOver determines whether the mouse is directly over a control Inherited from Control (PRIM_CTRL) |
| MouseOverStyle | MouseOverStyle defines the style to be applied to a control when the mouse is over it Inherited from Control (PRIM_CTRL) |
| MouseOverStyles | MouseOverStyles is a collection of styles to be applied to a control when the mouse is over it Inherited from Control (PRIM_CTRL) |
| Name | Name identifies the component Inherited from Object (PRIM_OBJT) |
| NotificationStyle | NotificationStyle controls how events are triggered |
| Opacity | Opacity denotes the appearance of a control in terms of its interaction with its background Inherited from Control (PRIM_CTRL) |
| Owner | Owner owns this component Inherited from Object (PRIM_OBJT) |
| Parent | Reference to the control in which this control is visually positioned Inherited from Control (PRIM_CTRL) |
| Popup | Popup allows a PopupPanel instance to be used instead of the typical right click popup menu Inherited from Control (PRIM_CTRL) |
| PopupMenu | Reference to a PopupMenu to be shown on a right click Inherited from Control (PRIM_CTRL) |
| ReadOnly | ReadOnly controls whether a component can be used for input |
| Rotation | Rotation allows a control to rotate a number of degrees about a given origin Inherited from Control (PRIM_CTRL) |
| RotationOriginLeft | RotationOriginLeft defines the left coordinate of an imaginary point around which a control will rotate Inherited from Control (PRIM_CTRL) |
| RotationOriginTop | RotationOriginTop defines the top coordinate of an imaginary point around which a control will rotate Inherited from Control (PRIM_CTRL) |
| RowHeight | Height of a rows in the drop down in pixels |
| ScaleHeight | ScaleHeight is the percentage of the height to use in the visual appearance of a control Inherited from Control (PRIM_CTRL) |
| ScaleOriginLeft | ScaleOriginLeft defines the left coordinate of an imaginary point from which a control will scale Inherited from Control (PRIM_CTRL) |
| ScaleOriginTop | ScaleOriginTop defines the top coordinate of an imaginary point from which a control will scale Inherited from Control (PRIM_CTRL) |
| ScaleWidth | ScaleWidth is the percentage of the width to use in the visual appearance of a control Inherited from Control (PRIM_CTRL) |
| ScreenLeft | ScreenLeft sets the distance from the left of the screen Inherited from Control (PRIM_CTRL) |
| ScreenTop | ScreenTop sets the distance from the top of the screen Inherited from Control (PRIM_CTRL) |
| ScrollLeft | Left position of a horizontally scrolled child control relative to its parent control Inherited from Control (PRIM_CTRL) |
| ScrollTop | Top position of a vertically scrolled child control relative to its parent control Inherited from Control (PRIM_CTRL) |
| SelectionEnd | Position in the value that selection ends |
| SelectionStart | Position in the value that selection starts |
| SelectionStyle | Specifies the rules for item selection within the list |
| ShowSelection | Show selection when the control does not have focus |
| ShowSelectionHilight | Highlight selected items when the control does not have focus |
| SkewLeft | SkewLeft defines the angle at which to skew the control horizontally Inherited from Control (PRIM_CTRL) |
| SkewOriginLeft | SkewOriginLeft defines the left coordinate of an imaginary point from which a control will skew Inherited from Control (PRIM_CTRL) |
| SkewOriginTop | SkewOriginTop defines the top coordinate of an imaginary point from which a control will skew Inherited from Control (PRIM_CTRL) |
| SkewTop | SkewTop defines the angle at which to skew the control vertically Inherited from Control (PRIM_CTRL) |
| Style | Style defines the style to be applied to a control Inherited from Control (PRIM_CTRL) |
| Styles | Collection of styles to be applied to the control Inherited from Control (PRIM_CTRL) |
| TabPosition | TabPosition sets the order of focus when the Tab key is used Inherited from Control (PRIM_CTRL) |
| TabStop | Set to false to stop focus being given to the control via the Tab key Inherited from Control (PRIM_CTRL) |
| Text | Text contains the formatted data currently showing in the edit area |
| ThemeDrawStyle | Name of the Theme DrawStyle to be applied to the control Inherited from Control (PRIM_CTRL) |
| Top | Position of the control relative to the top boundary of its parent Inherited from Control (PRIM_CTRL) |
| TouchMove | Determines how the control will respond to touch move processing Inherited from Control (PRIM_CTRL) |
| TouchRotate | Determines how the control will respond to touch rotation Inherited from Control (PRIM_CTRL) |
| TouchScale | Determines how the control will respond to touch scaling Inherited from Control (PRIM_CTRL) |
| TouchSize | Determines whether a control can be resized Inherited from Control (PRIM_CTRL) |
| Value | Value of the data class |
| ValueAt | Value at the specified location |
| Visible | Show or hide the control Inherited from Control (PRIM_CTRL) |
| VisualStyle | VisualStyle sets the appearance Inherited from Control (PRIM_CTRL) |
| VisualStyleOfParent | Adopt the Visual style from the parent control Inherited from Control (PRIM_CTRL) |
| Width | Width of the component in pixels Inherited from Control (PRIM_CTRL) |
Events
| Name | Description |
|---|---|
| AnimationEnded | Fired when an animation is ended Inherited from Control (PRIM_CTRL) Cancelled |
| AutoCompleting | Fired as a value is being edited allowing for a replacement value to be returned
Value |
| Changed | Changed is a change in the component |
| CloseUp | Fired when the dropdown is closed |
| ComboChanged | Changed is a change in the component |
| CreateInstance | CreateInstance is signalled when an instance of a component is created Inherited from Control (PRIM_CTRL) |
| DestroyInstance | DestroyInstance is signalled when an instance of a component is about to be destroyed Inherited from Control (PRIM_CTRL) |
| DoubleClick | Fired when the user double clicks
Origin, Handled |
| DragDrop | Fired on mouse up to signify the end of a drag process Inherited from Control (PRIM_CTRL) PosX, PosY, Source, Payload, AggregatedSource, Origin, Handled, DragResult |
| DragOver | Fired during the drag and drop process when the cursor moves over the control Inherited from Control (PRIM_CTRL) PosX, PosY, Source, Payload, DragState, AcceptDrop, DragCursor, ShowDropHilight, AggregatedSource, Origin, Handled |
| DropDown | DropDown occurs when the list portion of the box drops down
Continue |
| EndDrag | Fired when the drag and drop process has completed Inherited from Control (PRIM_CTRL) Source, Payload, DragResult, AggregatedSource, Origin, Handled |
| Enter | Fired when the Enter key is pressed
KeyCode, Char, IsAltDown, IsControlDown, IsShiftDown, Handled |
| GotFocus | Fired when the control receives the focus |
| Initialize | Fired after a component has been realized for the first time Inherited from Control (PRIM_CTRL) |
| ItemGotFocus | Fired when an item receives the focus |
| ItemGotFocusAccept | ItemGotFocusAccept is fired when the item gets focus
Accept, Reason |
| ItemGotSelection | Fired when an item in the list becomes selected |
| ItemGotSelectionAccept | Fired when an item in the list is about to become selected
Accept, Reason |
| ItemLostFocus | Fired when the item loses focus |
| ItemLostFocusAccept | Fired when an item in the list is about to lose focus
Accept, Reason |
| ItemLostSelection | ItemLostSelection happens when another item is selected |
| ItemLostSelectionAccept | Fired when an item in the list is about to lose selection
Accept, Reason |
| KeyPress | Fired when a key is pressed on the keyboard
KeyCode, Char, IsAltDown, IsControlDown, IsShiftDown, Handled |
| LostFocus | LostFocus happens when a component is no longer active |
| MouseEnter | The mouse has entered the bounds of the control Inherited from Control (PRIM_CTRL) |
| MouseHover | The mouse has hovered over the control Inherited from Control (PRIM_CTRL) Origin, Handled |
| MouseLeave | The mouse has left the bounds of the control Inherited from Control (PRIM_CTRL) |
| StartDrag | Fired when the user starts a drag and drop process Inherited from Control (PRIM_CTRL) Source, Payload, Continue, DragList, AggregatedSource, Origin, Handled |
| TouchChange | Fired repeatedly between the TouchStart and TouchEnd boundaries to provide details of the touch events Inherited from Control (PRIM_CTRL) MoveLeft, MoveTop, ScaleWidth, ScaleHeight, Rotation, Continue |
| TouchEnd | Fired when the user stops touching the screen Inherited from Control (PRIM_CTRL) |
| TouchStart | Fired when the user first makes physical contact with the screen Inherited from Control (PRIM_CTRL) Origin, TouchMove, TouchRotate, TouchScale, TouchSize |
Methods
| Name | Description |
|---|---|
| CloseDropDown | Forces the listbox portion of a DropDown or DropDownList style combo box to be closed
Result |
| FadeIn | Animate from invisible to visible Inherited from Control (PRIM_CTRL) Duration, Delay |
| FadeOut | Animate from visible to invisible Inherited from Control (PRIM_CTRL) Duration, Delay, Visible |
| MoveFrom | Move a control from the specified position to the current position Inherited from Control (PRIM_CTRL) Left, Top, Duration, Delay |
| MoveTo | Animate a move from the specified number of pixels Inherited from Control (PRIM_CTRL) Left, Top, Duration, Delay |
| OpenDropDown | Forces the listbox portion of a DropDown or DropDownList style combo box to be shown
Result |
| Realize | Creates the visual portion of dynamically created controls Inherited from Control (PRIM_CTRL) |
| Scale | Animate a change of scale Inherited from Control (PRIM_CTRL) ScaleWidth, ScaleHeight, Duration, Delay |
| SelectText | Set selection within the value
StartPosition, Length |
| SetFocus | Sets the control to be the focus control Inherited from Control (PRIM_CTRL) |
| SetValueAt | Set the value at the specified position
Result, Row, Column, Value |
| ShowMessages | LANSA Internal Use Inherited from Control (PRIM_CTRL) |
| SizeTo | Changes and animates control size changing Inherited from Control (PRIM_CTRL) Width, Height, Duration, Delay |
| Unrealize | Destroys the visual portion of dynamically created controls Inherited from Control (PRIM_CTRL) |
| UpdateDisplay | UpdateDisplay updates the display immediately Inherited from Control (PRIM_CTRL) |
See also
LANSA Version 15, April 2020