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88 lines
1.9 KiB
Markdown
88 lines
1.9 KiB
Markdown
# Background
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The `background` rule sets the background color of a widget.
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## Syntax
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```
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background: <COLOR> [<PERCENTAGE>];
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```
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--8<-- "docs/styles/snippets/color_css_syntax.md"
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The optional [percentage](./css_units/percentage.md) sets the transparency level and will override any transparency specified directly in the color.
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## Examples
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This example creates three widgets and applies a different background to each.
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=== "background.py"
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```python
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--8<-- "docs/examples/styles/background.py"
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```
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=== "background.css"
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```sass
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--8<-- "docs/examples/styles/background.css"
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```
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=== "Output"
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```{.textual path="docs/examples/styles/background.py"}
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```
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The next example creates ten widgets layed out side by side to show the effect of setting different percentages for the transparency of the background color.
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=== "background_transparency.py"
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```python
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--8<-- "docs/examples/styles/background_transparency.py"
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```
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=== "background_transparency.css"
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```sass
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--8<-- "docs/examples/styles/background_transparency.css"
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```
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=== "Output"
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```{.textual path="docs/examples/styles/background_transparency.py"}
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```
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## CSS
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```sass
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/* Blue background */
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background: blue;
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/* 20% red background */
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background: red 20%;
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/* RGB color */
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background: rgb(100,120,200);
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/* HSL color */
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background: hsl(290,70%,80%);
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```
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## Python
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You can use the same syntax as CSS, or explicitly set a `Color` object for finer-grained control.
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```python
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# Set blue background
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widget.styles.background = "blue"
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# Set through HSL model
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widget.styles.background = "hsl(351,32%,89%)"
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from textual.color import Color
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# Set with a color object by parsing a string
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widget.styles.background = Color.parse("pink")
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widget.styles.background = Color.parse("#FF00FF")
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# Set with a color object instantiated directly
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widget.styles.background = Color(120, 60, 100)
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```
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