TGraphicControl: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: TGraphicControl
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| 1 | + | **TGraphicControl** is a base class for lightweight components like [[TBevel]]. | |
| 2 | + | ||
| 3 | + | It supports simple lightweight controls that do not need the ability to accept keyboard input or contain other controls. | |
| 4 | + | ||
| 5 | + | Since lightweight controls do not wrap GUI widgets, they use fewer resources than controls based on TWinControl. | |
| 6 | + | ||
| 7 | + | TGraphicControl provides a Canvas property for access to the control's drawing surface and a virtual Paint method and an OnPaint handler, called in response to paint requests received by the parent control. | |
| 8 | + | ||
| 9 | + | Override the Paint method or supply your own OnPaint handler, to do the actual drawing of the control. | |
| 10 | + | ||
| 11 | + | If you want to accept keyboard input, or need to support child controls, use a [[TCustomControl]] instead. | |
| 12 | + | ||
| 13 | + | Most important members: | |
| 14 | + | ||
| 15 | + | - [[procedure Paint]]; | |
| 16 | + | - [[property OnPaint]]: [[TNotifyEvent]]; | |
| 17 | + | - [[property Canvas]]: [[TCanvas]]; | |
| 18 | + | ||
| 19 | + | ## See also | |
| 20 | + | ||
| 21 | + | - [[doc:lcl/controls/tgraphiccontrol.html|TGraphicControl doc]] | |
| 22 | + | ||
| 23 | + | --- | |
| 24 | + | *From the Free Pascal wiki, page "TGraphicControl", as it stood on 2019-12-30 after a change by Trev, 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).* |