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Color Viewer Slider: Improve high contrast support, touch AT support,…
… and APG code quality guidelines support (#1746) Makes the following changes to the color viewer slider example: * Align with current APG code quality guidelines, including using a single object for the color viewer. * Use SVG graphic elements instead of HTML elements for the visual rendering. * Use currentColor value for SVG stroke property to support high contrast modes in operating systems. * Use event.key instead of event.keyCode for responding to keyboard events, which also provides support for iOS and Android screen readers. * Updated focus styling to have a ring around the thumb. * Use pointer events instead of mouse events, which provides support for moving the slider thumb with touch. * Added group role and accessible name for the color viewer widget. Co-authored-by: Matt King <a11yThinker@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| /* CSS Document */ | ||
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| .color-viewer-sliders label { | ||
| display: block; | ||
| } | ||
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| .color-viewer-sliders .color-box { | ||
| width: 200px; | ||
| height: 200px; | ||
| border: black solid medium; | ||
| text-align: center; | ||
| padding: 0.25em; | ||
| forced-color-adjust: none; | ||
| } | ||
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| .color-viewer-sliders .color-info { | ||
| padding-top: 5px; | ||
| } | ||
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| .color-viewer-sliders .color-info label { | ||
| margin-top: 0.25em; | ||
| display: block; | ||
| } | ||
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| .color-slider { | ||
| margin: 0; | ||
| margin-bottom: 1em; | ||
| padding: 2px; | ||
| touch-action: pan-y; | ||
| width: 350px; | ||
| outline: none; | ||
| } | ||
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| .color-slider div, | ||
| .color-slider svg { | ||
| display: block; | ||
| width: 350px; | ||
| } | ||
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| .color-slider-label { | ||
| margin: 0; | ||
| padding: 0; | ||
| font-weight: bold; | ||
| } | ||
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| .color-slider .value { | ||
| color: currentColor; | ||
| fill: currentColor; | ||
| } | ||
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| .color-slider .valueBackground { | ||
| fill: white; | ||
| stroke-width: 0; | ||
| } | ||
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| .color-slider .rail { | ||
| fill: #bbb; | ||
| stroke: currentColor; | ||
| stroke-width: 2px; | ||
| opacity: 0.8; | ||
| } | ||
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| .color-slider .fill { | ||
| stroke-width: 0; | ||
| opacity: 0.5; | ||
| pointer-events: none; | ||
| } | ||
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| .color-slider.red .fill { | ||
| fill: red; | ||
| } | ||
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| .color-slider.green .fill { | ||
| fill: green; | ||
| } | ||
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| .color-slider.blue .fill { | ||
| fill: blue; | ||
| } | ||
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| .color-slider .thumb { | ||
| fill: #666; | ||
| stroke: currentColor; | ||
| stroke-width: 2px; | ||
| } | ||
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| .color-slider .focus { | ||
| fill: transparent; | ||
| stroke: transparent; | ||
| stroke-width: 2px; | ||
| } | ||
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| .color-slider:focus .value, | ||
| .color-slider:hover .value { | ||
| font-weight: bold; | ||
| } | ||
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| .color-slider:focus .fill, | ||
| .color-slider:hover .fill { | ||
| opacity: 1; | ||
| } | ||
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| .color-slider:focus .rail, | ||
| .color-slider:hover .rail { | ||
| fill: transparent; | ||
| stroke: currentColor; | ||
| opacity: 1; | ||
| } | ||
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| .color-slider:focus .thumb, | ||
| .color-slider:hover .thumb { | ||
| fill: #ddd; | ||
| stroke: currentColor; | ||
| opacity: 1; | ||
| } | ||
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| .color-slider:focus .focus, | ||
| .color-slider:hover .focus { | ||
| stroke: currentColor; | ||
| } |
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