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43 lines
1.3 KiB
Markdown
43 lines
1.3 KiB
Markdown
# Box-sizing
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The `box-sizing` rule impacts how `width` and `height` rules are translated in to screen dimensions, when combined with `padding` and `border`.
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The default value is `border-box` which means that padding and border are included in in the width and height. This setting means that 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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You can set `box-sizing` to `content-box` which tells Textual that padding and border should 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). The top widget has `box-sizing: border-box` which means that padding and border reduces the space for content. 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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=== "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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=== "Output"
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```{.textual path="docs/examples/styles/box_sizing.py"}
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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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