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Add a web widget for the activity indicator (shoelace spinner) #2050

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merged 6 commits into from
Jul 26, 2023
Merged

Add a web widget for the activity indicator (shoelace spinner) #2050

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0def72b
Add a web widget for the activity indicator
ahter Jul 23, 2023
4b05cfe
Add ActivityIndicator for the web factories
ahter Jul 23, 2023
8a82297
Set flex only when using the default width
ahter Jul 23, 2023
d6e5398
Merge branch 'main' into add-progress-ring
freakboy3742 Jul 23, 2023
db1bdfe
An alternate solution to the box sizing problem.
freakboy3742 Jul 26, 2023
64dc969
Update changenote and widget support matrix.
freakboy3742 Jul 26, 2023
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1 change: 1 addition & 0 deletions changes/2050.feature.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Activity indicator now has a web widget.
7 changes: 4 additions & 3 deletions core/src/toga/style/pack.py
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Expand Up @@ -764,9 +764,10 @@ def __css__(self):
# direction
css.append(f"flex-direction: {self.direction.lower()};")
# flex
if (self.width == NONE and self.direction == ROW) or (
self.height == NONE and self.direction == COLUMN
):
if (
(self.width == NONE and self.direction == ROW)
or (self.height == NONE and self.direction == COLUMN)
) and getattr(self, "_use_default_width", True):
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For posterity: this approach was developed pairing with @ahter.

The underlying problem is that if the ActivityIndicator has no Toga style, it falls back to rendering as flex: 0 0 0px, which evaluates as 0 width in CSS. If you apply a fixed width of 20px, the animation for the spin and the gray background become misaligned. We need to work out how to:

  1. Apply a style override to the ActivityIndicator so that it doesn't collapse to 0 size, or
  2. Work out how to inject a widget-specific modification to Pack's __css__ implementation to disable the default

It feels to me like both are needed. (1) is needed because if a user applies a "width=100" pack style, we don't want the widget to render weird; (2) is needed to make sure that the default style results in a visible widget.

css.append(f"flex: {self.flex} 0 0;")

# width/flex
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2 changes: 2 additions & 0 deletions web/src/toga_web/factory.py
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Expand Up @@ -8,6 +8,7 @@

# from .images import Image
from .paths import Paths
from .widgets.activityindicator import ActivityIndicator
from .widgets.box import Box
from .widgets.button import Button

Expand Down Expand Up @@ -64,6 +65,7 @@ def not_implemented(feature):
# 'OptionContainer',
# 'PasswordInput',
"ProgressBar",
"ActivityIndicator",
# 'ScrollContainer',
# 'Selection',
# 'Slider',
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28 changes: 28 additions & 0 deletions web/src/toga_web/widgets/activityindicator.py
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@@ -0,0 +1,28 @@
"""
A web widget to display an activity indicator.

This is a web implementation of the `toga.ActivityIndicator` widget.

Details can be found in
https://shoelace.style/components/spinner
"""
from .base import Widget


class ActivityIndicator(Widget):
def create(self):
self.interface.style._use_default_width = False
self.native = self._create_native_widget("sl-spinner")
self.stop()

# Actions
def start(self):
self.native.style.visibility = "visible"
self._is_running = True

def stop(self):
self.native.style.visibility = "hidden"
self._is_running = False

def is_running(self):
return self._is_running
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