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65 lines
2.0 KiB
Markdown
65 lines
2.0 KiB
Markdown
# Box-sizing
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The `box-sizing` style determines how the width and height of a widget are calculated.
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## Syntax
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```
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box-sizing: border-box | content-box;
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```
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### Values
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| Value | Description |
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|------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| `border-box` (default) | Padding and border are included in the width and height. If you add padding and/or border the widget will not change in size, but you will have less space for content. |
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| `content-box` | Padding and border will increase the size of the widget, leaving the content area unaffected. |
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## Example
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Both widgets in this example have the same height (5).
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The top widget has `box-sizing: border-box` which means that padding and border reduce the space for content.
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The bottom widget has `box-sizing: content-box` which increases the size of the widget to compensate for padding and border.
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=== "Output"
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```{.textual path="docs/examples/styles/box_sizing.py"}
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```
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=== "box_sizing.py"
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```python
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--8<-- "docs/examples/styles/box_sizing.py"
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```
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=== "box_sizing.css"
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```sass hl_lines="2 6"
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--8<-- "docs/examples/styles/box_sizing.css"
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```
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## CSS
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```sass
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/* Set box sizing to border-box (default) */
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box-sizing: border-box;
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/* Set box sizing to content-box */
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box-sizing: content-box;
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```
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## Python
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```python
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# Set box sizing to border-box (default)
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widget.box_sizing = "border-box"
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# Set box sizing to content-box
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widget.box_sizing = "content-box"
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```
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## See also
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- [`border`](./border.md) to add a border around a widget.
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- [`padding`](./padding.md) to add spacing around the content of a widget.
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