Appendix A: QCOMBOBOX
| Rapid-Q Documentation by William Yu (c)1999-2000 |
Appendix A: QCOMBOBOX |
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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 |
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| Align | INTEGER | RW | alNone | W |
| Align determines how the control aligns within its parent control.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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 |
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| 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 |
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| 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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