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feat(elevation): preserve the alpha value of the provided color #10877

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merged 1 commit into from May 10, 2018
Merged

feat(elevation): preserve the alpha value of the provided color #10877

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18 changes: 15 additions & 3 deletions guides/elevation.md
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Expand Up @@ -22,15 +22,27 @@ achieved by switching elevation classes:
### Mixins

Elevations can also be added in CSS via the `mat-elevation` mixin, which takes a number 0-24
indicating the elevation of the element. In order to use the mixin, you must import
`~@angular/material/theming`:
indicating the elevation of the element as well as optional arguments for the elevation shadow's
color tone and opacity.

Since an elevation shadow consists of multiple shadow components of varying opacities, the
`$opacity` argument of the mixin is considered a factor by which to scale these initial values
rather than an absolute value.

In order to use the mixin, you must import `~@angular/material/theming`:

```scss
@import '~@angular/material/theming';

.my-class {
.my-class-with-default-shadow {
// Adds a shadow for elevation level 2 with default color and full opacity:
@include mat-elevation(2);
}

.my-class-with-custom-shadow {
// Adds a shadow for elevation level 2 with color #e91e63 and 80% of the default opacity:
@include mat-elevation(2, #e91e63, 0.8);
}
```

For convenience, you can use the `mat-elevation-transition` mixin to add a transition when the
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177 changes: 93 additions & 84 deletions src/lib/core/style/_elevation.scss
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Expand Up @@ -31,93 +31,93 @@
// created by taking a few reference shadow sets created by Google's Designers and interpolating
// all of the values between them.

@function _get-umbra-map($color) {
@function _get-umbra-map($color, $opacity) {
@return (
0: '0px 0px 0px 0px #{rgba($color, 0.2)}',
1: '0px 2px 1px -1px #{rgba($color, 0.2)}',
2: '0px 3px 1px -2px #{rgba($color, 0.2)}',
3: '0px 3px 3px -2px #{rgba($color, 0.2)}',
4: '0px 2px 4px -1px #{rgba($color, 0.2)}',
5: '0px 3px 5px -1px #{rgba($color, 0.2)}',
6: '0px 3px 5px -1px #{rgba($color, 0.2)}',
7: '0px 4px 5px -2px #{rgba($color, 0.2)}',
8: '0px 5px 5px -3px #{rgba($color, 0.2)}',
9: '0px 5px 6px -3px #{rgba($color, 0.2)}',
10: '0px 6px 6px -3px #{rgba($color, 0.2)}',
11: '0px 6px 7px -4px #{rgba($color, 0.2)}',
12: '0px 7px 8px -4px #{rgba($color, 0.2)}',
13: '0px 7px 8px -4px #{rgba($color, 0.2)}',
14: '0px 7px 9px -4px #{rgba($color, 0.2)}',
15: '0px 8px 9px -5px #{rgba($color, 0.2)}',
16: '0px 8px 10px -5px #{rgba($color, 0.2)}',
17: '0px 8px 11px -5px #{rgba($color, 0.2)}',
18: '0px 9px 11px -5px #{rgba($color, 0.2)}',
19: '0px 9px 12px -6px #{rgba($color, 0.2)}',
20: '0px 10px 13px -6px #{rgba($color, 0.2)}',
21: '0px 10px 13px -6px #{rgba($color, 0.2)}',
22: '0px 10px 14px -6px #{rgba($color, 0.2)}',
23: '0px 11px 14px -7px #{rgba($color, 0.2)}',
24: '0px 11px 15px -7px #{rgba($color, 0.2)}'
0: '0px 0px 0px 0px #{rgba($color, $opacity * 0.2)}',
1: '0px 2px 1px -1px #{rgba($color, $opacity * 0.2)}',
2: '0px 3px 1px -2px #{rgba($color, $opacity * 0.2)}',
3: '0px 3px 3px -2px #{rgba($color, $opacity * 0.2)}',
4: '0px 2px 4px -1px #{rgba($color, $opacity * 0.2)}',
5: '0px 3px 5px -1px #{rgba($color, $opacity * 0.2)}',
6: '0px 3px 5px -1px #{rgba($color, $opacity * 0.2)}',
7: '0px 4px 5px -2px #{rgba($color, $opacity * 0.2)}',
8: '0px 5px 5px -3px #{rgba($color, $opacity * 0.2)}',
9: '0px 5px 6px -3px #{rgba($color, $opacity * 0.2)}',
10: '0px 6px 6px -3px #{rgba($color, $opacity * 0.2)}',
11: '0px 6px 7px -4px #{rgba($color, $opacity * 0.2)}',
12: '0px 7px 8px -4px #{rgba($color, $opacity * 0.2)}',
13: '0px 7px 8px -4px #{rgba($color, $opacity * 0.2)}',
14: '0px 7px 9px -4px #{rgba($color, $opacity * 0.2)}',
15: '0px 8px 9px -5px #{rgba($color, $opacity * 0.2)}',
16: '0px 8px 10px -5px #{rgba($color, $opacity * 0.2)}',
17: '0px 8px 11px -5px #{rgba($color, $opacity * 0.2)}',
18: '0px 9px 11px -5px #{rgba($color, $opacity * 0.2)}',
19: '0px 9px 12px -6px #{rgba($color, $opacity * 0.2)}',
20: '0px 10px 13px -6px #{rgba($color, $opacity * 0.2)}',
21: '0px 10px 13px -6px #{rgba($color, $opacity * 0.2)}',
22: '0px 10px 14px -6px #{rgba($color, $opacity * 0.2)}',
23: '0px 11px 14px -7px #{rgba($color, $opacity * 0.2)}',
24: '0px 11px 15px -7px #{rgba($color, $opacity * 0.2)}'
);
}

@function _get-penumbra-map($color) {
@function _get-penumbra-map($color, $opacity) {
@return (
0: '0px 0px 0px 0px #{rgba($color, 0.14)}',
1: '0px 1px 1px 0px #{rgba($color, 0.14)}',
2: '0px 2px 2px 0px #{rgba($color, 0.14)}',
3: '0px 3px 4px 0px #{rgba($color, 0.14)}',
4: '0px 4px 5px 0px #{rgba($color, 0.14)}',
5: '0px 5px 8px 0px #{rgba($color, 0.14)}',
6: '0px 6px 10px 0px #{rgba($color, 0.14)}',
7: '0px 7px 10px 1px #{rgba($color, 0.14)}',
8: '0px 8px 10px 1px #{rgba($color, 0.14)}',
9: '0px 9px 12px 1px #{rgba($color, 0.14)}',
10: '0px 10px 14px 1px #{rgba($color, 0.14)}',
11: '0px 11px 15px 1px #{rgba($color, 0.14)}',
12: '0px 12px 17px 2px #{rgba($color, 0.14)}',
13: '0px 13px 19px 2px #{rgba($color, 0.14)}',
14: '0px 14px 21px 2px #{rgba($color, 0.14)}',
15: '0px 15px 22px 2px #{rgba($color, 0.14)}',
16: '0px 16px 24px 2px #{rgba($color, 0.14)}',
17: '0px 17px 26px 2px #{rgba($color, 0.14)}',
18: '0px 18px 28px 2px #{rgba($color, 0.14)}',
19: '0px 19px 29px 2px #{rgba($color, 0.14)}',
20: '0px 20px 31px 3px #{rgba($color, 0.14)}',
21: '0px 21px 33px 3px #{rgba($color, 0.14)}',
22: '0px 22px 35px 3px #{rgba($color, 0.14)}',
23: '0px 23px 36px 3px #{rgba($color, 0.14)}',
24: '0px 24px 38px 3px #{rgba($color, 0.14)}'
0: '0px 0px 0px 0px #{rgba($color, $opacity * 0.14)}',
1: '0px 1px 1px 0px #{rgba($color, $opacity * 0.14)}',
2: '0px 2px 2px 0px #{rgba($color, $opacity * 0.14)}',
3: '0px 3px 4px 0px #{rgba($color, $opacity * 0.14)}',
4: '0px 4px 5px 0px #{rgba($color, $opacity * 0.14)}',
5: '0px 5px 8px 0px #{rgba($color, $opacity * 0.14)}',
6: '0px 6px 10px 0px #{rgba($color, $opacity * 0.14)}',
7: '0px 7px 10px 1px #{rgba($color, $opacity * 0.14)}',
8: '0px 8px 10px 1px #{rgba($color, $opacity * 0.14)}',
9: '0px 9px 12px 1px #{rgba($color, $opacity * 0.14)}',
10: '0px 10px 14px 1px #{rgba($color, $opacity * 0.14)}',
11: '0px 11px 15px 1px #{rgba($color, $opacity * 0.14)}',
12: '0px 12px 17px 2px #{rgba($color, $opacity * 0.14)}',
13: '0px 13px 19px 2px #{rgba($color, $opacity * 0.14)}',
14: '0px 14px 21px 2px #{rgba($color, $opacity * 0.14)}',
15: '0px 15px 22px 2px #{rgba($color, $opacity * 0.14)}',
16: '0px 16px 24px 2px #{rgba($color, $opacity * 0.14)}',
17: '0px 17px 26px 2px #{rgba($color, $opacity * 0.14)}',
18: '0px 18px 28px 2px #{rgba($color, $opacity * 0.14)}',
19: '0px 19px 29px 2px #{rgba($color, $opacity * 0.14)}',
20: '0px 20px 31px 3px #{rgba($color, $opacity * 0.14)}',
21: '0px 21px 33px 3px #{rgba($color, $opacity * 0.14)}',
22: '0px 22px 35px 3px #{rgba($color, $opacity * 0.14)}',
23: '0px 23px 36px 3px #{rgba($color, $opacity * 0.14)}',
24: '0px 24px 38px 3px #{rgba($color, $opacity * 0.14)}'
);
}

@function _get-ambient-map($color) {
@function _get-ambient-map($color, $opacity) {
@return (
0: '0px 0px 0px 0px #{rgba($color, 0.12)}',
1: '0px 1px 3px 0px #{rgba($color, 0.12)}',
2: '0px 1px 5px 0px #{rgba($color, 0.12)}',
3: '0px 1px 8px 0px #{rgba($color, 0.12)}',
4: '0px 1px 10px 0px #{rgba($color, 0.12)}',
5: '0px 1px 14px 0px #{rgba($color, 0.12)}',
6: '0px 1px 18px 0px #{rgba($color, 0.12)}',
7: '0px 2px 16px 1px #{rgba($color, 0.12)}',
8: '0px 3px 14px 2px #{rgba($color, 0.12)}',
9: '0px 3px 16px 2px #{rgba($color, 0.12)}',
10: '0px 4px 18px 3px #{rgba($color, 0.12)}',
11: '0px 4px 20px 3px #{rgba($color, 0.12)}',
12: '0px 5px 22px 4px #{rgba($color, 0.12)}',
13: '0px 5px 24px 4px #{rgba($color, 0.12)}',
14: '0px 5px 26px 4px #{rgba($color, 0.12)}',
15: '0px 6px 28px 5px #{rgba($color, 0.12)}',
16: '0px 6px 30px 5px #{rgba($color, 0.12)}',
17: '0px 6px 32px 5px #{rgba($color, 0.12)}',
18: '0px 7px 34px 6px #{rgba($color, 0.12)}',
19: '0px 7px 36px 6px #{rgba($color, 0.12)}',
20: '0px 8px 38px 7px #{rgba($color, 0.12)}',
21: '0px 8px 40px 7px #{rgba($color, 0.12)}',
22: '0px 8px 42px 7px #{rgba($color, 0.12)}',
23: '0px 9px 44px 8px #{rgba($color, 0.12)}',
24: '0px 9px 46px 8px #{rgba($color, 0.12)}'
0: '0px 0px 0px 0px #{rgba($color, $opacity * 0.12)}',
1: '0px 1px 3px 0px #{rgba($color, $opacity * 0.12)}',
2: '0px 1px 5px 0px #{rgba($color, $opacity * 0.12)}',
3: '0px 1px 8px 0px #{rgba($color, $opacity * 0.12)}',
4: '0px 1px 10px 0px #{rgba($color, $opacity * 0.12)}',
5: '0px 1px 14px 0px #{rgba($color, $opacity * 0.12)}',
6: '0px 1px 18px 0px #{rgba($color, $opacity * 0.12)}',
7: '0px 2px 16px 1px #{rgba($color, $opacity * 0.12)}',
8: '0px 3px 14px 2px #{rgba($color, $opacity * 0.12)}',
9: '0px 3px 16px 2px #{rgba($color, $opacity * 0.12)}',
10: '0px 4px 18px 3px #{rgba($color, $opacity * 0.12)}',
11: '0px 4px 20px 3px #{rgba($color, $opacity * 0.12)}',
12: '0px 5px 22px 4px #{rgba($color, $opacity * 0.12)}',
13: '0px 5px 24px 4px #{rgba($color, $opacity * 0.12)}',
14: '0px 5px 26px 4px #{rgba($color, $opacity * 0.12)}',
15: '0px 6px 28px 5px #{rgba($color, $opacity * 0.12)}',
16: '0px 6px 30px 5px #{rgba($color, $opacity * 0.12)}',
17: '0px 6px 32px 5px #{rgba($color, $opacity * 0.12)}',
18: '0px 7px 34px 6px #{rgba($color, $opacity * 0.12)}',
19: '0px 7px 36px 6px #{rgba($color, $opacity * 0.12)}',
20: '0px 8px 38px 7px #{rgba($color, $opacity * 0.12)}',
21: '0px 8px 40px 7px #{rgba($color, $opacity * 0.12)}',
22: '0px 8px 42px 7px #{rgba($color, $opacity * 0.12)}',
23: '0px 9px 44px 8px #{rgba($color, $opacity * 0.12)}',
24: '0px 9px 46px 8px #{rgba($color, $opacity * 0.12)}'
);
}

Expand All @@ -127,29 +127,38 @@ $mat-elevation-transition-duration: 280ms !default;
// The default easing value for elevation transitions.
$mat-elevation-transition-timing-function: $mat-fast-out-slow-in-timing-function;

// The default color for elevation shadows.
$mat-elevation-color: black !default;

// The default opacity scaling value for elevation shadows.
$mat-elevation-opacity: 1 !default;

// Prefix for elevation-related selectors.
$_mat-elevation-prefix: 'mat-elevation-z';

// Applies the correct css rules to an element to give it the elevation specified by $zValue.
// The $zValue must be between 0 and 24.
@mixin mat-elevation($zValue, $color: black) {
@mixin mat-elevation($zValue, $color: $mat-elevation-color, $opacity: $mat-elevation-opacity) {
@if type-of($zValue) != number or not unitless($zValue) {
@error '$zValue must be a unitless number';
}
@if $zValue < 0 or $zValue > 24 {
@error '$zValue must be between 0 and 24';
}

box-shadow: #{map-get(_get-umbra-map($color), $zValue)},
#{map-get(_get-penumbra-map($color), $zValue)},
#{map-get(_get-ambient-map($color), $zValue)};
box-shadow: #{map-get(_get-umbra-map($color, $opacity), $zValue)},
#{map-get(_get-penumbra-map($color, $opacity), $zValue)},
#{map-get(_get-ambient-map($color, $opacity), $zValue)};
}

// Applies the elevation to an element in a manner that allows
// consumers to override it via the Material elevation classes.
@mixin mat-overridable-elevation($zValue) {
@mixin mat-overridable-elevation(
$zValue,
$color: $mat-elevation-color,
$opacity: $mat-elevation-opacity) {
&:not([class*='#{$_mat-elevation-prefix}']) {
@include mat-elevation($zValue);
@include mat-elevation($zValue, $color, $opacity);
}
}

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