ATListbox: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: ATListbox
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| 1 | + | # About | |
| 2 | + | ||
| 3 | + | ATListbox is OS-independant listbox control. It's made for dialog like Sublime Text's command list. If OnDrawItem is set, listbox is fully owner-drawn: you must not set items, just set ItemCount, ItemIndex. | |
| 4 | + | ||
| 5 | + | Listbox doesn't get focus by click; to get focus on click set CanGetFocus=true (if focused, it handles keys Up/Down/PgUp/PgDn/Home/End, else you need to handle OnKeyDown in form and set listbox's ItemIndex by hand, which is boring). | |
| 6 | + | ||
| 7 | + | Author: Alexey Torgashin | |
| 8 | + | ||
| 9 | + | Screenshot: | |
| 10 | + | ||
| 11 | + | <figure> | |
| 12 | + | <img src="atlistbox.png" title="atlistbox.png" /> | |
| 13 | + | <figcaption>atlistbox.png</figcaption> | |
| 14 | + | </figure> | |
| 15 | + | ||
| 16 | + | # Download | |
| 17 | + | ||
| 18 | + | Homepage at github: <https://github.com/Alexey-T/ATFlatControls> | |
| 19 | + | ||
| 20 | + | # License | |
| 21 | + | ||
| 22 | + | MPL 2.0 or LGPL. | |
| 23 | + | ||
| 24 | + | # Properties | |
| 25 | + | ||
| 26 | + | - Items: StringList to store items, or you can ignore it if you use OnDrawItem event (listbox will be fully virtual) | |
| 27 | + | - ItemCount: count of items | |
| 28 | + | - ItemIndex: index of active item | |
| 29 | + | - ItemTop: index of item visible at the top | |
| 30 | + | - ItemHeight: height (in pixels) of each item | |
| 31 | + | - VisibleItems: count of items fully visible inside control | |
| 32 | + | - CanGetFocus: allow control to be focused on click | |
| 33 | + | ||
| 34 | + | - ThemedScrollbar: allows control to use [[ATScrollBar]] instead of default OS scrollbar | |
| 35 | + | - ThemedColors: not used (made to use in CudaText app) | |
| 36 | + | ||
| 37 | + | Events | |
| 38 | + | ||
| 39 | + | - OnClick | |
| 40 | + | - OnDblClick | |
| 41 | + | - OnDrawItem: allows to owner-draw all items | |
| 42 | + | - OnChangedSel: fired on changed ItemIndex | |
| 43 | + | ||
| 44 | + | # Example | |
| 45 | + | ||
| 46 | + | Let's create list: | |
| 47 | + | ||
| 48 | + | ``` pascal | |
| 49 | + | uses Math, ATListbox; //package atflatcontrols_package.lpk | |
| 50 | + | ||
| 51 | + | var | |
| 52 | + | b: TATListbox; | |
| 53 | + | ||
| 54 | + | procedure TfmMain.FormCreate(Sender: TObject); | |
| 55 | + | begin | |
| 56 | + | b:= TATListbox.Create(Self); | |
| 57 | + | b.Parent:= Self; | |
| 58 | + | b.Align:= alClient; | |
| 59 | + | ||
| 60 | + | b.OnDrawItem:= @ListDraw; | |
| 61 | + | b.OnClick:= @ListClick; //see example in github https://github.com/Alexey-T/ATFlatControls/blob/master/app/demo_listbox/unit1.pas | |
| 62 | + | ||
| 63 | + | b.Color:= $e0e0e0; | |
| 64 | + | b.ItemCount:= 21; | |
| 65 | + | end; | |
| 66 | + | ``` | |
| 67 | + | ||
| 68 | + | Let's set OnDrawItem to this (simply paint "itemNN"): | |
| 69 | + | ||
| 70 | + | ``` pascal | |
| 71 | + | procedure TfmMain.ListDraw(Sender: TObject; C: TCanvas; AIndex: integer; | |
| 72 | + | const ARect: TRect); | |
| 73 | + | begin | |
| 74 | + | C.Brush.Color:= IfThen(AIndex=b.ItemIndex, clMedGray, b.Color); | |
| 75 | + | C.FillRect(ARect); | |
| 76 | + | ||
| 77 | + | C.Pen.Color:= clMedGray; | |
| 78 | + | C.Line(ARect.Left+2, ARect.Bottom-1, ARect.Right-2, ARect.Bottom-1); | |
| 79 | + | ||
| 80 | + | C.TextOut(ARect.Left+6, ARect.Top+2, 'item '+inttostr(AIndex)); | |
| 81 | + | end; | |
| 82 | + | ``` | |
| 83 | + | ||
| 84 | + | --- | |
| 85 | + | *From the Free Pascal wiki, page "ATListbox", as it stood on 2021-12-16 after a change by Alextp, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's [[Licensing]] page. If you have concerns about this material, [message the admin](/wiki-contact).* | |
| 86 | + | Category: Components | |
| 87 | + | Category: Lazarus |