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Docs: extension styling and theming (#1267)
Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>
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docs/extensions/capabilities/color-reference.md
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docs/extensions/capabilities/color-reference.md
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# Theme color reference
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You can use CSS variables generated from theme `.json` files to style an extension with respect of active theme.
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## Base colors
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- `blue`: blue color.
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- `magenta`: magenta color.
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- `golden`: gold/yellow color.
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- `halfGray`: gray with some apacity applied.
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- `primary`: Lens brand (blue) color.
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- `colorSuccess`: successfull operations color.
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- `colorOk`: successfull operations (bright version) color.
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- `colorInfo`: informational, in-progress color.
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- `colorError`: critical error color.
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- `colorSoftError`: error color.
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- `colorWarning`: warning color.
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- `colorVague`: soft gray color for notices, hints etc.
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- `colorTerminated`: terminated, closed, stale color.
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- `boxShadow`: semi-transparent box-shadow color.
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## Text colors
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- `textColorPrimary`: foreground text color.
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- `textColorSecondary`: foreground text color for different paragraps, parts of text.
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- `textColorAccent`: foreground text color to highlight its parts.
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## Border colors
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- `borderColor`: border color.
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- `borderFaintColor`: fainted (lighter or darker, which depends on the theme) border color.
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## Layout colors
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- `mainBackground`: main background color for the app.
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- `contentColor`: background color for panels contains some data.
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- `layoutBackground`: background color for layout parts.
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- `layoutTabsBackground`: background color for general tabs.
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- `layoutTabsActiveColor`: foreground color for general tabs.
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- `layoutTabsLineColor`: background color for lines under general tabs.
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## Sidebar colors
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- `sidebarLogoBackground`: background color behind logo in sidebar.
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- `sidebarActiveColor`: foreground color for active menu items in sidebar.
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- `sidebarSubmenuActiveColor`: foreground color for active submenu items in sidebar.
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- `sidebarBackground`: background color for sidebar.
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## Button colors
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- `buttonPrimaryBackground`: button background color for primary actions.
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- `buttonDefaultBackground`: default button background color.
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- `buttonAccentBackground`: accent button background color.
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- `buttonDisabledBackground`: disabled button background color.
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## Table colors
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- `tableBgcStripe`: background color for odd rows in table.
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- `tableBgcSelected`: background color for selected row in table.
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- `tableHeaderBackground`: background color for table header.
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- `tableHeaderBorderWidth`: border width under table header.
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- `tableHeaderBorderColor`: border color for line under table header.
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- `tableHeaderColor`: foreground color for table header.
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- `tableSelectedRowColor`: foreground color for selected row in table.
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## Dock colors
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- `dockHeadBackground`: background color for dock's header.
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- `dockInfoBackground`: background color for dock's info panel.
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- `dockInfoBorderColor`: border color for dock's info panel.
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## Helm chart colors
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- `helmLogoBackground`: background color for chart logo.
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- `helmImgBackground`: background color for chart image.
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- `helmStableRepo`: background color for stable repo.
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- `helmIncubatorRepo`: background color for incubator repo.
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- `helmDescriptionHr`: Helm chart description separator line color.
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- `helmDescriptionBlockqouteColor`: Helm chart description blockquote color.
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- `helmDescriptionBlockqouteBorder`: Helm chart description blockquote border color.
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- `helmDescriptionBlockquoteBackground`: Helm chart description blockquote background color.
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- `helmDescriptionHeaders`: Helm chart description headers color.
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- `helmDescriptionH6`: Helm chart description header foreground color.
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- `helmDescriptionTdBorder`: Helm chart description table cell border color.
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- `helmDescriptionTrBackground`: Helm chart description table row background color.
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- `helmDescriptionCodeBackground`: Helm chart description code background color.
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- `helmDescriptionPreBackground`: Helm chart description pre background color.
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- `helmDescriptionPreColor`: Helm chart description pre foreground color.
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## Terminal colors
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- `terminalBackground`: Terminal background color.
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- `terminalForeground`: Terminal foreground color.
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- `terminalCursor`: Terminal cursor color.
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- `terminalCursorAccent`: Terminal cursor accent color.
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- `terminalSelection`: Terminal selection background color.
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- `terminalBlack`: Terminal black color.
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- `terminalRed`: Terminal red color.
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- `terminalGreen`: Terminal green color.
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- `terminalYellow`: Terminal yellow color.
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- `terminalBlue`: Terminal blue color.
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- `terminalMagenta`: Terminal magenta color.
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- `terminalCyan`: Terminal cyan color.
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- `terminalWhite`: Terminal white color.
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- `terminalBrightBlack`: Terminal bright black color.
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- `terminalBrightRed`: Terminal bright red color.
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- `terminalBrightGreen`: Terminal bright green color.
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- `terminalBrightYellow`: Terminal bright yellow color.
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- `terminalBrightBlue`: Terminal bright blue color.
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- `terminalBrightMagenta`: Terminal bright magenta color.
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- `terminalBrightCyan`: Terminal bright cyan color.
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- `terminalBrightWhite`: Terminal bright white color.
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## Dialog colors
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- `dialogHeaderBackground`: background color for dialog header.
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- `dialogFooterBackground`: background color for dialog footer.
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## Detail panel (Drawer) colors
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- `drawerTitleText`: drawer title foreground color.
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- `drawerSubtitleBackground`: drawer subtitle foreground color.
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- `drawerItemNameColor`: foreground color for item name in drawer.
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- `drawerItemValueColor`: foreground color for item value in drawer.
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## Misc colors
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- `logsBackground`: background color for pod logs.
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- `clusterMenuBackground`: background color for cluster menu.
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- `clusterMenuBorderColor`: border color for cluster menu.
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- `clusterSettingsBackground`: background color for cluster settings.
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- `addClusterIconColor`: add cluster button background color.
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- `iconActiveColor`: active cluster icon foreground color.
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- `iconActiveBackground`: active cluster icon background color.
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- `filterAreaBackground`: page filter area (where selected namespaces are lister) background color.
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- `chartStripesColor`: bar chart zebra stripes background color.
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- `chartCapacityColor`: background color for capacity values in bar charts.
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- `pieChartDefaultColor`: default background color for pie chart values.
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- `selectOptionHoveredColor`: foregrond color for selected element in dropdown list.
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- `lineProgressBackground`: background color for progress line.
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- `radioActiveBackground`: background color for active radio buttons.
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- `menuActiveBackground`: background color for active menu items.
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In most cases you would only need base, text and some of the layout colors.
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docs/extensions/capabilities/images/css-vars-in-devtools.png
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docs/extensions/capabilities/images/theme-selector.png
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docs/extensions/capabilities/styling.md
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# Styling an extension
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Lens provides a set of global styles and UI components that can be used by any extension to preserve look and feel of the application.
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## Styling approach
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Lens heavily uses SCSS preprocessor with a set of predefined variables and mixins.
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For layout tasks Lens is using [flex.box](https://www.npmjs.com/package/flex.box) library which provides helpful class names to specify some of the [flexbox](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Basic_Concepts_of_Flexbox) properties. For example, `div` with class names:
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```
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<div className="flex column align-center"></div>
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```
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at the end will have following css properties:
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```
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div {
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display: flex;
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flex-direction: column;
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align-items: center;
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}
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```
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However, feel free to use any styling technique or framework like [Emotion](https://github.com/emotion-js/emotion) or just plain CSS if you prefer.
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## Themes
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Lens using 2 built-in themes located in `src/renderer/themes` folder each for light and dark color schemes. Active theme can be changed in the `Preferences` page.
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When Lens gets loaded it transforms selected theme `json` file into list of [CSS Custom Properties (CSS Variables)](https://developer.mozilla.org/en-US/docs/Web/CSS/Using_CSS_custom_properties) which then gets injected into `:root` element so any of the down-level components can use them.
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When user changes a theme, the process is repeated, new css variables appear instead of previous ones.
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If you want to follow a selected theme to keep the 'native' Lens look and feel, respecting the light/dark appearance of your extension, you can use provided variables and build-in lens components such as buttons, dropdowns, checkboxes etc.
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## Injected styles
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Every extention is affected by list of default global styles defined in `src/renderer/components/app.scss`. These are basic browser resets like setting `box-sizing` property for every element, default text and background colors, default font size, basic headings visualisation etc.
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Extension may overwrite them if needed.
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## Variables to use
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### Basic styling
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There is a list of CSS Variables available for extension to use. Basic variables located inside `:root` selected in `src/renderer/components/app.scss`:
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```
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--unit: 8px;
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--padding: var(--unit);
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--margin: var(--unit);
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--border-radius: 3px;
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--font-main: 'Roboto', 'Helvetica', 'Arial', sans-serif;
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--font-monospace: Lucida Console, Monaco, Consolas, monospace;
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--font-size-small: calc(1.5 * var(--unit));
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--font-size: calc(1.75 * var(--unit));
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--font-size-big: calc(2 * var(--unit));
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--font-weight-thin: 300;
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--font-weight-normal: 400;
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--font-weight-bold: 500;
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```
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They're intended to set consistent paddings and font-sizes across components, e.g.
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```
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.status {
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padding-left: calc(var(--padding) * 2);
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font-size: var(--font-size-small);
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}
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```
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### Themable colors
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After theme file gets parsed it provides list of theme-defined colors. Most of their values are different for light and dark themes. You can use them to preserve consitent view of extension with respect of selected theme.
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```
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"blue": "#3d90ce",
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"magenta": "#c93dce",
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"golden": "#ffc63d",
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"halfGray": "#87909c80",
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"primary": "#3d90ce",
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"textColorPrimary": "#555555",
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"textColorSecondary": "#51575d",
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"textColorAccent": "#333333",
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"borderColor": "#c9cfd3",
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"borderFaintColor": "#dfdfdf",
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"mainBackground": "#f1f1f1",
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"contentColor": "#ffffff",
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"layoutBackground": "#e8e8e8",
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"layoutTabsBackground": "#f8f8f8",
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"layoutTabsActiveColor": "#333333",
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"layoutTabsLineColor": "#87909c80"
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...
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...
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```
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They can be used in form of `var(--magenta)`.
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A complete list of all themable colors can be found in the [color reference](../color-reference).
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Colors values are located inside `src/renderer/themes/lens-dark.json` and `src/renderer/themes/lens-light.json` files.
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## Using CSS Variables inside CSS-in-JS components
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If a developer uses an `Emotion` (or similar) framework to work with styles inside an extension, they can use variables in the following form:
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```
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const Container = styled.div(() => ({
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backgroundColor: 'var(--mainBackground)'
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}));
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```
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@ -26,7 +26,8 @@ nav:
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- Extension Capabilities:
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- Overview: extensions/capabilities/README.md
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- Common Capabilities: extensions/capabilities/common-capabilities.md
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- Theming: extensions/capabilities/theming.md
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- Styling: extensions/capabilities/styling.md
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- Color reference: extensions/capabilities/color-reference.md
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- Extension Guides:
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- Overview: extensions/guides/README.md
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- Renderer Extension: extensions/guides/renderer-extension.md
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}
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:root {
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--unit: 8px;
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--padding: var(--unit);
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--margin: var(--unit);
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--border-radius: 3px;
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--font-main: 'Roboto', 'Helvetica', 'Arial', sans-serif;
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--font-monospace: Lucida Console, Monaco, Consolas, monospace;
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--font-size-small: calc(1.5 * var(--unit));
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--font-size: calc(1.75 * var(--unit));
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--font-size-big: calc(2 * var(--unit));
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--font-weight-thin: 300;
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--font-weight-normal: 400;
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--font-weight-bold: 500;
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--mainBackground: #1e2124;
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--main-layout-header: 40px;
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--drag-region-height: 22px
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@ -122,7 +134,7 @@ code {
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vertical-align: middle;
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border-radius: $radius;
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font-family: $font-monospace;
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font-size: $font-size * .9;
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font-size: calc($font-size * .9);
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color: #b4b5b4;
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&.block {
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@ -97,7 +97,7 @@
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.tick {
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color: $tickColor;
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font: $font-size * 1.3 "Material Icons";
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font: calc($font-size * 1.3) "Material Icons";
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&:after {
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content: "radio_button_unchecked";
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$unit: 8px;
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$padding: $unit;
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$margin: $unit;
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$radius: ceil($unit * .3);
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$radius: var(--border-radius);
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// Fonts
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$font-main: 'Roboto', 'Helvetica', 'Arial', sans-serif !default;
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$font-monospace: Lucida Console, Monaco, Consolas, monospace;
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$font-size-small: floor(1.5 * $unit);
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$font-size: floor(1.75 * $unit);
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$font-size-big: floor(2 * $unit);
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$font-weight-thin: 300;
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$font-weight-normal: 400;
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$font-weight-bold: 500;
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$font-main: var(--font-main);
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$font-monospace: var(--font-monospace);
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$font-size-small: var(--font-size-small);
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$font-size: var(--font-size);
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$font-size-big: var(--font-size-big);
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$font-weight-thin: var(--font-weight-thin);
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$font-weight-normal: var(--font-weight-normal);
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$font-weight-bold: var(--font-weight-bold);
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// Z-index correlations
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$zIndex-sidebar-hover: 500;
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