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PeterPanino / thtmlviewer

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StyleTypes.pas: Code improvement for C++Builder #399

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
The following lines in file StyleTypes.pas (lines 402-407):

const
// CSS 2.1 defines a fixed ratio between pt and px at 96 dpi: 1px = 0.75pt.
// (see 
http://www.w3.org/TR/2010/WD-CSS2-20101207/syndata.html#value-def-length for 
details).
  HTMLViewerPixelsPerInch = 96.0; // fixed assumption in CSS 2.1 as lots of designs rely on it.
  HTMLViewerPointsPerInch = 72.0;
  HTMLViewerPointsPerPixel = HTMLViewerPointsPerInch / HTMLViewerPixelsPerInch;

result in the C++Builder file StyleTypes.hpp as follows:
#define HTMLViewerPixelsPerInch  (9.600000E+01)
#define HTMLViewerPointsPerInch  (7.200000E+01)
static const System::Extended HTMLViewerPointsPerPixel = 7.500000E-01;

Each file including the HtmlViewer component throws the compiler warning:
[C++ Warning] <File>.cpp(<last line>): 'HTMLViewerPointsPerPixel' is declared 
but never used

Solutions:
1. Please use only typed constants.
const
  HTMLViewerPixelsPerInch : Double = 96.0; // fixed assumption in CSS 2.1 as lots of designs rely on it.
  HTMLViewerPointsPerInch : Double = 72.0;
  HTMLViewerPointsPerPixel : Double = HTMLViewerPointsPerInch / HTMLViewerPixelsPerInch;

2. Move the declaration of HTMLViewerPointsPerPixel to the "implementation" 
section. Then the declaration does not occur in the hpp file. And we don't get 
many warnings.

Thank you!

Original issue reported on code.google.com by hpk...@sked.de on 24 Feb 2015 at 5:29

GoogleCodeExporter commented 9 years ago 
Thanks for spotting this issue.

https://github.com/BerndGabriel/HtmlViewer/commit/e1d8ec24f8adec87cd8360abb539cc
3792a2389c fixes this issue.

Original comment by OrphanCat on 16 Jun 2015 at 7:38