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canvas: actually follow CSS conventions for 1/2/3/4 arguments in padding

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This commit is contained in:
Paul Davis 2021-09-14 21:17:50 -06:00
parent 5eee8bf1a3
commit c952c57a99
1 changed files with 28 additions and 10 deletions
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38
libs/canvas/canvas/types.h
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@ -222,19 +222,37 @@ struct FourDimensions {
FourDimensions (Distance u, Distance r = -1., Distance d = -1., Distance l = -1.) { FourDimensions (Distance u, Distance r = -1., Distance d = -1., Distance l = -1.) {
/* CSS style defaults: if only 1 value is givem, set all 4 to /* CSS style defaults: see https://developer.mozilla.org/en-US/docs/Web/CSS/Shorthand_properties
* that value; if 2 values are supplied, up uses the first,
* other 3 use the second; if 3 values are supplied, up uses
* the first, right uses the second, other 2 use the
* third. etc.
*/ */
Distance last = u; std::vector<Distance> args;
up = u; args.push_back (u);
if (r >= 0) { last = r; } right = last;
if (d >= 0) { last = d; } down = last; if (r >= 0) { args.push_back (r); }
if (l >= 0) { last = l; } left = last; if (d >= 0) { args.push_back (d); }
if (l >= 0) { args.push_back (l); }
switch (args.size()) {
case 1:
up = right = down = left = args[0];
break;
case 2:
up = down = args[0];
left = right = args[1];
break;
case 3:
up = args[0];
left = right = args[1];
down = args[2];
break;
case 4:
up = args[0];
right = args[1];
down = args[2];
left = args[3];
break;
}
} }
}; };