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2015-12-25 19:42

Appendix A: QCOMBOBOX

Rapid-Q Documentation by William Yu (c)1999-2000	Appendix A: QCOMBOBOX

QCOMBOBOX Component

QCombobox implements a simple pull down listbox. The first item in any combobox is 0, the next is 1, and so on...

QCombobox Properties

Field	Type	R/W	Default	Support

Align	INTEGER	RW	alNone	W
	Align determines how the control aligns within its parent control.
Color	INTEGER	RW		W
CopyMode	INTEGER	RW	cmBlackness	W
Cursor	INTEGER	RW	crDefault	W
DropDownCount	INTEGER	RW	8	W
	DropDownCount is the maximum number of items displayed in the drop-down list.
Enabled	INTEGER	RW	True	WXG
Font	QFONT	W		W
Height	INTEGER	RW		WXG
Hint	STRING	RW		WXG
Item	ARRAY of STRING	RW		WXG
ItemCount	INTEGER	R		WXG
ItemHeight	INTEGER	RW		W
ItemIndex	INTEGER	RW	-1	WXG
	ItemIndex indicates which item in the drop-down list is selected. If no item is selected, then ItemIndex is -1.
Left	INTEGER	RW	0	WXG
MaxLength	INTEGER	RW		W
	MaxLength is the maximum number of characters the user can type into the edit portion of the combobox.
Parent	QFORM/QPANEL/QTABCONTROL	W		WXG
PopupMenu	QPOPUPMENU	W		W
ShowHint	INTEGER	RW	False	WXG
Sorted	INTEGER	RW	False	WG
Style	INTEGER	RW	csDropDown	W
	Style determines the display style of the combobox. 0 = csDropDown -- A drop-down list with an edit box for manually entered text. 1 = csSimple -- A drop-down list with an edit box and a fixed list (list box) underneath. 2 = csDropDownList -- A drop-down list with no edit box for manual entry. 3 = csOwnerDrawFixed -- Owner-draw drop-down list with an edit box. Each item in the list is the height specified by the ItemHeight property. 4 = csOwnerDrawVariable -- Owner-draw drop-down list with an edit box. Each item can have varying heights.
TabOrder	INTEGER	RW		W
Tag	INTEGER	RW		WXG
Text	STRING	RW		W
Top	INTEGER	RW	0	WXG
Visible	INTEGER	RW	True	WXG
Width	INTEGER	RW		WXG

QCombobox Methods

Method	Type	Description	Params	Support

AddItems	SUBI	Add items to combobox	STRINGs, Infinite	WXG
Circle	SUB (x1%, y1%, x2%, y2%, c%, fill%)	Draw & Fill Circle	6	W
Clear	SUB	Clears entire Combobox	0	WXG
CopyRect	SUB (D, Image, S)	D and S are QRECTs, Image can be a QImage, QCanvas, or QBitmap	3	W
DelItems	SUBI	Delete items by their index	Index #s, Infinite	WXG
Draw	SUB (x%, y%, BMP)	Draw Bitmap at (X,Y)	3	W
FillRect	SUB (x1%, y1%, x2%, y2%, c%)	Draws & Fills a rectangle	5	W
InsertItem	SUB (Index%, String$)	Insert item at Index%	2	WXG
Line	SUB (x1%, y1%, x2%, y2%, c%)	Draws a line	5	W
Paint	SUB (x%, y%, c%, borderc%)	Fill Region	4	W
Pset	SUB (x%, y%, c%)	Pixel plot	3	W
Rectangle	SUB (x1%, y1%, x2%, y2%, c%)	Draws a rectangle	5	W
Repaint	SUB	Force repainting of combobox	0	W
RoundRect	SUB (x1%, y1%, x2%, y2%, x3%, y3%, c%)	Draws & Fills a rounded rectangle	7	W
StretchDraw	SUB (Rect AS QRECT, BMP)	Draw BMP and stretch to fit inside Rect	2	W
TextHeight	FUNCTION (Text$) AS WORD	Returns the height, in pixels, of Text$ string	1	W
TextWidth	FUNCTION (Text$) AS WORD	Returns the width, in pixels, of Text$ string	1	W
TextRect	SUB (Rect AS QRECT, x%, y%, S$, fc%, bc%)	Write text, and clip within region Rect	6	W
TextOut	SUB (x%, y%, S$, fc%, bc%)	Writes text to image	5	W

QCombobox Events

Event	Type	Occurs when...	Params	Support

OnChange	VOID	User selects a different item	0	WXG
OnDrawItem	SUB (Index%, State%, R AS QRect)	Items are redrawn for ownerdraw comboboxes	3	W
OnMeasureItem	SUB (Index%, Height%)	Calculate Height for ownerdraw variable comboboxes	3	W

QCombobox Examples

  DIM Form AS QForm
  DIM ComboBox AS QComboBox

  SUB ItemChanged
    PRINT ComboBox.Item(ComboBox.ItemIndex)
  END SUB

  ComboBox.Parent = Form
  ComboBox.OnChange = ItemChanged
  ComboBox.AddItems "1. Apples", "2. Oranges", "3. Bananas"

  Form.ShowModal

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