LCL component to implement a ruler
lazarus / 31-LCL

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ermeneuta · 2018-06-22 17:12

Good afternoon,

  I am in search of a LCL component to implement a mouse-draggable
ruler, like that shown in the attached picture. Alternatively, as I
have already such a component for the Delphi VCL, how can I recode
that VCL component into an LCL component (under Linux).

Thanks

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wp · 2018-06-22 17:23

Most Win components can be made cross-platform if you remove the units
Windows, Messages and replace them by LCLIntf, LCLType, LMessages
(sometimes also LCLProc). If there are messages replace the type
TWMSomething by TLMSomething (e.g. TWMSize --> TLMSize), and TMessage
by TLMessage. The same with the message constants: WM_SOMETHING -->
LM_SOMETHING, e.g. WM_SIZE --> LM_SIZE.

A riuler is contained in the JVCL library
(https://sourceforge.net/p/lazarus-
ccr/svn/HEAD/tree/components/jvcllaz/run/JvCtrls/), not draggable
though. But there is also a moveable panel
(https://sourceforge.net/p/lazarus-
ccr/svn/HEAD/tree/components/jvcllaz/run/JvCtrls/JvMovableBevel.pas)-
Maybe you get some ideas about dragging from there.

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AlexTP · 2018-06-23 09:55

wp,
do you know in which Wiki page can I post your comment? about porting
LCL comp.

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Ñuño_Martínez · 2018-06-23 11:44

You may start from How To Write Lazarus Component article.  May be
adding a section with a brief description with a link to main article
or something.