more docs

docs/examples/styles/background.py

@@ -0,0 +1,29 @@
+from textual.app import App
+from textual.widgets import Static
+
+
+class BackgroundApp(App):
+    CSS = """
+    Static {
+        height:1fr;
+        content-align: center middle;
+        color: white;
+    }    
+    #static1 {
+        background: red;
+    }
+    #static2 {
+        background: rgb(0, 255, 0);
+    }
+    #static3 {
+        background: hsl(240, 100%, 50%);
+    }
+    """
+
+    def compose(self):
+        yield Static("Hello, World!", id="static1")
+        yield Static("Hello, World!", id="static2")
+        yield Static("Hello, World!", id="static3")
+
+
+app = BackgroundApp()

docs/examples/styles/border.py

@@ -0,0 +1,34 @@
+from textual.app import App
+from textual.widgets import Static
+
+
+class BorderApp(App):
+    CSS = """
+    Screen > Static {
+        height:5;
+        content-align: center middle;
+        color: white;
+        margin: 1;
+        box-sizing: border-box;
+    }    
+    #static1 {
+        background: red 20%;
+        border: solid red;
+    }
+    #static2 {
+        background: green 20%;
+        border: dashed green;
+    }
+    #static3 {
+        background: blue 20%;
+        border: tall blue;
+    }
+    """
+
+    def compose(self):
+        yield Static("Hello, World!", id="static1")
+        yield Static("Hello, World!", id="static2")
+        yield Static("Hello, World!", id="static3")
+
+
+app = BorderApp()

docs/examples/styles/color.py

@@ -0,0 +1,28 @@
+from textual.app import App
+from textual.widgets import Static
+
+
+class ColorApp(App):
+    CSS = """
+    Static {
+        height:1fr;
+        content-align: center middle;
+    }    
+    #static1 {
+        color: red;
+    }
+    #static2 {
+        color: rgb(0, 255, 0);
+    }
+    #static3 {
+        color: hsl(240, 100%, 50%)
+    }
+    """
+
+    def compose(self):
+        yield Static("Hello, World!", id="static1")
+        yield Static("Hello, World!", id="static2")
+        yield Static("Hello, World!", id="static3")
+
+
+app = ColorApp()

docs/examples/styles/display.py

@@ -1,24 +1,27 @@
 from textual.app import App
-from textual.widget import Widget
+from textual.widgets import Static
 
 
-class WidthApp(App):
+class DisplayApp(App):
     CSS = """    
-    Screen > Widget {             
+    Screen {
-        height: 5;
+        background: green;
-        background: blue;        
-        color: white;   
-        border: heavy white;     
     }
-    Widget.hidden {
+    Static {             
+        height: 5;        
+        background: white;        
+        color: blue;   
+        border: heavy blue;     
+    }
+    Static.remove {
         display: none;
     }
     """
 
     def compose(self):
-        yield Widget(id="widget1")
+        yield Static("Widget 1")
-        yield Widget(id="widget2", classes="hidden")
+        yield Static("widget 2", classes="remove")
-        yield Widget(id="widget3")
+        yield Static("widget 3")
 
 
-app = WidthApp()
+app = DisplayApp()

docs/examples/styles/height.py

@@ -2,7 +2,7 @@ from textual.app import App
 from textual.widget import Widget
 
 
-class WidthApp(App):
+class HeightApp(App):
     CSS = """    
     Screen > Widget {     
         background: green;
@@ -15,4 +15,4 @@ class WidthApp(App):
         yield Widget()
 
 
-app = WidthApp()
+app = HeightApp()

docs/examples/styles/margin.py

@@ -0,0 +1,27 @@
+from textual.app import App
+from textual.widgets import Static
+
+TEXT = """I must not fear.
+Fear is the mind-killer.
+Fear is the little-death that brings total obliteration.
+I will face my fear.
+I will permit it to pass over me and through me.
+And when it has gone past, I will turn the inner eye to see its path.
+Where the fear has gone there will be nothing. Only I will remain."""
+
+
+class MarginApp(App):
+    CSS = """
+   
+    Static {
+        margin: 4 8;  
+        background: blue 20%;  
+    }    
+    
+    """
+
+    def compose(self):
+        yield Static(TEXT)
+
+
+app = MarginApp()

docs/examples/styles/padding.py

@@ -0,0 +1,27 @@
+from textual.app import App
+from textual.widgets import Static
+
+TEXT = """I must not fear.
+Fear is the mind-killer.
+Fear is the little-death that brings total obliteration.
+I will face my fear.
+I will permit it to pass over me and through me.
+And when it has gone past, I will turn the inner eye to see its path.
+Where the fear has gone there will be nothing. Only I will remain."""
+
+
+class PaddingApp(App):
+    CSS = """
+   
+    Static {
+        padding: 4 8;  
+        background: blue 20%;  
+    }    
+    
+    """
+
+    def compose(self):
+        yield Static(TEXT)
+
+
+app = PaddingApp()

docs/examples/styles/text_style.py

@@ -0,0 +1,41 @@
+from textual.app import App
+from textual.widgets import Static
+
+TEXT = """I must not fear.
+Fear is the mind-killer.
+Fear is the little-death that brings total obliteration.
+I will face my fear.
+I will permit it to pass over me and through me.
+And when it has gone past, I will turn the inner eye to see its path.
+Where the fear has gone there will be nothing. Only I will remain."""
+
+
+class TextStyleApp(App):
+    CSS = """
+    Screen {
+        layout: horizontal;    
+    }
+    Static {
+        width:1fr;        
+    }    
+    #static1 {
+        background: red 30%;
+        text-style: bold;
+    }
+    #static2 {
+        background: green 30%;
+        text-style: italic;
+    }
+    #static3 {
+        background: blue 30%;
+        text-style: reverse;
+    }
+    """
+
+    def compose(self):
+        yield Static(TEXT, id="static1")
+        yield Static(TEXT, id="static2")
+        yield Static(TEXT, id="static3")
+
+
+app = TextStyleApp()

docs/examples/styles/visibility.py

@@ -0,0 +1,27 @@
+from textual.app import App
+from textual.widgets import Static
+
+
+class VisibilityApp(App):
+    CSS = """    
+    Screen {
+        background: green;
+    }
+    Static {             
+        height: 5;        
+        background: white;        
+        color: blue;   
+        border: heavy blue;     
+    }
+    Static.invisible {
+        visibility: hidden;
+    }
+    """
+
+    def compose(self):
+        yield Static("Widget 1")
+        yield Static("widget 2", classes="invisible")
+        yield Static("widget 3")
+
+
+app = VisibilityApp()

docs/styles/background.md

@@ -0,0 +1,41 @@
+# Background
+
+The `background` rule sets the background color of the widget.
+
+=== "background.py"
+
+    ```python
+    --8<-- "docs/examples/styles/background.py"
+    ```
+
+=== "Output"
+
+    ```{.textual path="docs/examples/styles/background.py"}
+    ```
+
+## CSS
+
+```sass
+/* Blue background */
+background: blue;
+
+/* 20% red backround */
+background: red 20%;
+
+/* RGB color */
+background: rgb(100,120,200);
+```
+
+## Python
+
+You can use the same syntax as CSS, or explicitly set a Color object.
+
+```python
+# Set blue background
+widget.styles.background = "blue"
+
+from textual.color import Color
+# Set with a color object
+widget.styles.background = Color.parse("pink")
+
+```

docs/styles/color.md

@@ -0,0 +1,41 @@
+# Color
+
+The `color` rule sets the text color of a Widget.
+
+=== "color.py"
+
+    ```python
+    --8<-- "docs/examples/styles/color.py"
+    ```
+
+=== "Output"
+
+    ```{.textual path="docs/examples/styles/color.py"}
+    ```
+
+## CSS
+
+```sass
+/* Blue background */
+color: blue;
+
+/* 20% red backround */
+color: red 20%;
+
+/* RGB color */
+color: rgb(100,120,200);
+```
+
+## Python
+
+You can use the same syntax as CSS, or explicitly set a Color object.
+
+```python
+# Set blue background
+widget.styles.color = "blue"
+
+from textual.color import Color
+# Set with a color object
+widget.styles.color = Color.parse("pink")
+
+```

docs/styles/height.md

@@ -1,6 +1,6 @@
 # Height
 
-The `height` property sets a widget's height. By default, it sets the width of the content area, but if `box-sizing` is set to `border-box` it sets the width of the border area.
+The `height` style sets a widget's height. By default, it sets the width of the content area, but if `box-sizing` is set to `border-box` it sets the width of the border area.
 
 ## Example
 

docs/styles/margin.md

@@ -0,0 +1,34 @@
+# Margin
+
+The `margin` rule adds space around the entire widget.
+
+- `1` Sets a margin of 1 around all 4 edges
+- `1 2` Sets a margin of 1 on the top and bottom edges, and a margin of 2 on the left and right edges
+- `1 2 3 4` Sets a margin of one on the top edge, 2 on the right, 3 on the bottom, and 4 on the left.
+
+## Example
+
+=== "margin.py"
+
+    ```python
+    --8<-- "docs/examples/styles/margin.py"
+    ```
+
+=== "Output"
+
+    ```{.textual path="docs/examples/styles/margin.py"}
+    ```
+
+## CSS
+
+```sass
+/* Set margin of 2 on the top and bottom edges, and 4 on the left and right */
+margin: 2 4;
+```
+
+## Python
+
+```python
+# In Python you can set the margin as a tuple of integers
+widget.styles.margin = (2, 3)
+```

docs/styles/padding.md

@@ -0,0 +1,34 @@
+# Padding
+
+The padding rule adds space around the content of a widget. You can specify padding with 1, 2 or 4 numbers.
+
+- `1` Sets a padding of 1 around all 4 edges
+- `1 2` Sets a padding of 1 on the top and bottom edges, and a padding of two on the left and right edges
+- `1 2 3 4` Sets a padding of one on the top edge, 2 on the right, 3 on the bottom, and 4 on the left.
+
+## Example
+
+=== "padding.py"
+
+    ```python
+    --8<-- "docs/examples/styles/padding.py"
+    ```
+
+=== "Output"
+
+    ```{.textual path="docs/examples/styles/padding.py"}
+    ```
+
+## CSS
+
+```sass
+/* Set padding of 2 on the top and bottom edges, and 4 on the left and right */
+padding: 2 4;
+```
+
+## Python
+
+```python
+# In Python you can set the padding as a tuple of integers
+widget.styles.padding = (2, 3)
+```

docs/styles/text_style.md

@@ -0,0 +1,36 @@
+# Text-style
+
+The `text-style` rule enables a number of different ways of displaying text. The value may be set to any of the following:
+
+- `"bold"` Sets **bold text**
+- `"italic"` Sets _italic text_
+- `"reverse"` Sets reverse video text (foreground and background colors reversed)
+- `"underline"` Sets <u>underline text</u>
+- `"strike"` Sets <s>strikethrough text</s>
+
+Text styles may be set in combination. For example "bold underline" or "reverse underline strike".
+
+## Example
+
+=== "text_style.py"
+
+    ```python
+    --8<-- "docs/examples/styles/text_style.py"
+    ```
+
+=== "Output"
+
+    ```{.textual path="docs/examples/styles/text_style.py"}
+    ```
+
+## CSS
+
+```sass
+text-style: italic;
+```
+
+## Python
+
+```python
+widget.styles.text_style = "italic"
+```

docs/styles/visibility.md

@@ -0,0 +1,48 @@
+# Visibility
+
+The `visibility` rule may be used to make a widget invisible while still reserving spacing for it. The default value is `"visible"` which will cause the Widget to be displayed as normal. Setting the value to `"hidden"` will cause the Widget to be removed from the screen.
+
+## Example
+
+Note that the second widget is hidden, while leaving a space where it would have been rendered.
+
+=== "visibility.py"
+
+    ```python
+    --8<-- "docs/examples/styles/visibility.py"
+    ```
+
+=== "Output"
+
+    ```{.textual path="docs/examples/styles/visibility.py"}
+    ```
+
+## CSS
+
+```sass
+/* Widget is on screen */
+visibility: visible;
+
+/* Widget is not on the screen */
+visibility: hidden;
+```
+
+## Python
+
+```python
+# Widget is invisible
+self.styles.visibility = "hidden"
+
+# Widget is visible
+self.styles.visibility = "visible"
+```
+
+There is also a shortcut to set a Widget's visibility. The `visible` property on `Widget` may be set to `True` or `False`.
+
+```python
+# Make a widget invisible
+widget.visible = False
+
+# Make the widget visible again
+widget.visible = True
+```

docs/styles/width.md

@@ -1,6 +1,6 @@
 # Width
 
-The `width` property sets a widget's width. By default, it sets the width of the content area, but if `box-sizing` is set to `border-box` it sets the width of the border area.
+The `width` style sets a widget's width. By default, it sets the width of the content area, but if `box-sizing` is set to `border-box` it sets the width of the border area.
 
 ## Example
 

examples/borders.py

@@ -0,0 +1,29 @@
+from itertools import cycle
+
+from textual.app import App
+from textual.color import Color
+from textual.constants import BORDERS
+from textual.widgets import Static
+
+
+class BorderApp(App):
+    """Displays a pride flag."""
+
+    COLORS = ["red", "orange", "yellow", "green", "blue", "purple"]
+
+    def compose(self):
+        self.dark = True
+        for border, color in zip(BORDERS, cycle(self.COLORS)):
+            static = Static(f"border: {border} {color};")
+            static.styles.height = 7
+            static.styles.background = Color.parse(color).with_alpha(0.2)
+            static.styles.margin = (1, 2)
+            static.styles.border = (border, color)
+            static.styles.content_align = ("center", "middle")
+            yield static
+
+
+app = BorderApp()
+
+if __name__ == "__main__":
+    app.run()

mkdocs.yml

@@ -11,9 +11,15 @@ nav:
     - "events/mount.md"
     - "events/resize.md"
   - Styles:    
+    - "styles/background.md"
+    - "styles/color.md"
     - "styles/display.md"
-    - "styles/width.md"
     - "styles/height.md"
+    - "styles/margin.md"
+    - "styles/padding.md"
+    - "styles/text_style.md"
+    - "styles/visibility.md"
+    - "styles/width.md"
   - Widgets: "/widgets/"
   - Reference:
     - "reference/app.md"

src/textual/constants.py

@@ -0,0 +1,11 @@
+"""
+Constants that we might want to expose via the public API.
+
+"""
+
+from ._border import BORDER_CHARS
+
+__all__ = ["BORDERS"]
+
+
+BORDERS = list(BORDER_CHARS)

src/textual/layouts/horizontal.py

@@ -29,7 +29,7 @@ class HorizontalLayout(Layout):
         total_fraction = sum(
             [int(style.width.value) for style in styles if style.width.is_fraction]
         )
-        fraction_unit = Fraction(size.height, total_fraction or 1)
+        fraction_unit = Fraction(size.width, total_fraction or 1)
 
         box_models = [
             widget.get_box_model(size, parent_size, fraction_unit)

tests/test_color.py

@@ -115,22 +115,28 @@ def test_color_parse(text, expected):
     assert Color.parse(text) == expected
 
 
-@pytest.mark.parametrize("input,output", [
+@pytest.mark.parametrize(
-    ("rgb( 300, 300 , 300 )", Color(255, 255, 255)),
+    "input,output",
-    ("rgba( 2 , 3 , 4, 1.0 )", Color(2, 3, 4, 1.0)),
+    [
-    ("hsl( 45, 25% , 25% )", Color(80, 72, 48)),
+        ("rgb( 300, 300 , 300 )", Color(255, 255, 255)),
-    ("hsla( 45, 25% , 25%, 0.35 )", Color(80, 72, 48, 0.35)),
+        ("rgba( 2 , 3 , 4, 1.0 )", Color(2, 3, 4, 1.0)),
-])
+        ("hsl( 45, 25% , 25% )", Color(80, 72, 48)),
+        ("hsla( 45, 25% , 25%, 0.35 )", Color(80, 72, 48, 0.35)),
+    ],
+)
 def test_color_parse_input_has_spaces(input, output):
     assert Color.parse(input) == output
 
 
-@pytest.mark.parametrize("input,output", [
+@pytest.mark.parametrize(
-    ("rgb(300, 300, 300)", Color(255, 255, 255)),
+    "input,output",
-    ("rgba(300, 300, 300, 300)", Color(255, 255, 255, 1.0)),
+    [
-    ("hsl(400, 200%, 250%)", Color(255, 255, 255, 1.0)),
+        ("rgb(300, 300, 300)", Color(255, 255, 255)),
-    ("hsla(400, 200%, 250%, 1.9)", Color(255, 255, 255, 1.0)),
+        ("rgba(300, 300, 300, 300)", Color(255, 255, 255, 1.0)),
-])
+        ("hsl(400, 200%, 250%)", Color(255, 255, 255, 1.0)),
+        ("hsla(400, 200%, 250%, 1.9)", Color(255, 255, 255, 1.0)),
+    ],
+)
 def test_color_parse_clamp(input, output):
     assert Color.parse(input) == output
 
@@ -141,7 +147,8 @@ def test_color_parse_hsl_negative_degrees():
 
 def test_color_parse_hsla_negative_degrees():
     assert Color.parse("hsla(-45, 50%, 50%, 0.2)") == Color.parse(
-        "hsla(315, 50%, 50%, 0.2)")
+        "hsla(315, 50%, 50%, 0.2)"
+    )
 
 
 def test_color_parse_color():