Before users had to know the exact opacity that the MD/iOS spec called for in order to change the hover or focused background color. This allows them to change the background without having to know the opacity.
- changes apply to Action Sheet (Buttons), Back Button, Button, FAB Button, Item, Menu Button, Segment Button, Tab Button
- greatly reduces the requirement by users to set the background hover, focused states for dark modes and custom themes, also eliminates the need to know what the hover opacity is for each based on the spec
- updates the MD dark theme per their spec
- adds a component guide for internal use changing Ionic components
references #18279fixes#20213fixes#19965
BREAKING CHANGE:
*Activated Class*
The `activated` class that is automatically added to buttons on press has been renamed to `ion-activated`. This will be more consistent with our `ion-focused` class we add and also will reduce conflicts with user's CSS.
*CSS Variables*
The `--background-hover`, `--background-focused` and `--background-activated` CSS variables on components that render native buttons will now have an opacity automatically set. If you are setting any of these like the following:
```
--background-hover: rgba(44, 44, 44, 0.08);
```
You will likely not see a hover state anymore. It should be updated to only set the desired color:
```
--background-hover: rgba(44, 44, 44);
```
If the opacity desired is something other than what the spec asks for, use:
```
--background-hover: rgba(44, 44, 44);
--background-hover-opacity: 1;
```
Reviews the `--width` and `--height` variables in each component to either remove or add them based on need.
- fixes a bug where the spinner color wasn't being set properly in loading
- adds css variables for customizing background, color, some borders in overlays
- fixes a bug where prefix, suffix are taking up too much width in picker
closes#16097
references ionic-team/ionic-docs#228
BREAKING CHANGES
## Core Components
Removes the `--width` and `--height` variables from the following components, in favor of CSS:
- Button
- FAB Button
- Checkbox
- Removes the `--width`/`--height` and adds a `--size` variable that is set on the width and height, allowing width and height to still be set and border-radius to still use it as a variable
- Radio
- Removes the `--width`/`--height` and `--inner-width`/`--inner-height` variables. Calculates inner values based on parent element size.
## Overlay Components
The following components have all be converted to shadow (or scoped) and have CSS variables for width/height:
- Action Sheet _(scoped)_
- Alert _(scoped)_
- Loading _(scoped)_
- Menu _(shadow)_
- Modal _(scoped)_
- Picker _(scoped)_
- Popover _(scoped)_
- Toast _(shadow)_
The above components will now have the following CSS variables for consistency among overlays:
| Name |
| ----------------- |
| `--height` |
| `--max-height` |
| `--max-width` |
| `--min-height` |
| `--min-width` |
| `--width` |
If the component does not set the value, it will default to `auto`.
## Removed CSS Variables
The following CSS properties have been removed:
| Component | Property | Reason |
| ---------------| --------------------| --------------------------------|
| **Button** | `--height` | Use CSS instead |
| **Button** | `--margin-bottom` | Use CSS instead |
| **Button** | `--margin-end` | Use CSS instead |
| **Button** | `--margin-start` | Use CSS instead |
| **Button** | `--margin-top` | Use CSS instead |
| **Button** | `--width` | Use CSS instead |
| **Checkbox** | `--height` | Use CSS or `--size` |
| **Checkbox** | `--width` | Use CSS or `--size` |
| **FAB Button** | `--width` | Use CSS instead |
| **FAB Button** | `--height` | Use CSS instead |
| **FAB Button** | `--margin-bottom` | Use CSS instead |
| **FAB Button** | `--margin-end` | Use CSS instead |
| **FAB Button** | `--margin-start` | Use CSS instead |
| **FAB Button** | `--margin-top | Use CSS instead |
| **Menu** | `--width-small` | Use a media query and `--width` |
| **Radio** | `--width` | Use CSS instead |
| **Radio** | `--height` | Use CSS instead |
| **Radio** | `--inner-height` | Calculated based on parent |
| **Radio** | `--inner-width` | Calculated based on parent |
