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On decorator (#2453)
* Add on decorator * decorator code * docs for on decorator * Examples * test errors * simplify listing * words * changelog * Update docs/guide/events.md Co-authored-by: Dave Pearson <davep@davep.org> * Update docs/guide/events.md Co-authored-by: Dave Pearson <davep@davep.org> * Update docs/examples/events/on_decorator.css Co-authored-by: Rodrigo Girão Serrão <5621605+rodrigogiraoserrao@users.noreply.github.com> * Update docs/guide/events.md Co-authored-by: Rodrigo Girão Serrão <5621605+rodrigogiraoserrao@users.noreply.github.com> * rewording * comment * clarification * Added note --------- Co-authored-by: Dave Pearson <davep@davep.org> Co-authored-by: Rodrigo Girão Serrão <5621605+rodrigogiraoserrao@users.noreply.github.com>
This commit is contained in:
Will McGugan
@@ -1,6 +1,14 @@
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"""
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An implementation of a classic calculator, with a layout inspired by macOS calculator.
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"""
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from decimal import Decimal
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from textual import events
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from textual import events, on
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from textual.app import App, ComposeResult
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from textual.containers import Container
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from textual.css.query import NoMatches
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@@ -34,7 +42,6 @@ class CalculatorApp(App):
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def watch_numbers(self, value: str) -> None:
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"""Called when numbers is updated."""
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# Update the Numbers widget
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self.query_one("#numbers", Static).update(value)
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def compute_show_ac(self) -> bool:
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@@ -55,19 +62,19 @@ class CalculatorApp(App):
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yield Button("+/-", id="plus-minus", variant="primary")
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yield Button("%", id="percent", variant="primary")
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yield Button("÷", id="divide", variant="warning")
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yield Button("7", id="number-7")
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yield Button("8", id="number-8")
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yield Button("9", id="number-9")
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yield Button("7", id="number-7", classes="number")
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yield Button("8", id="number-8", classes="number")
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yield Button("9", id="number-9", classes="number")
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yield Button("×", id="multiply", variant="warning")
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yield Button("4", id="number-4")
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yield Button("5", id="number-5")
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yield Button("6", id="number-6")
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yield Button("4", id="number-4", classes="number")
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yield Button("5", id="number-5", classes="number")
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yield Button("6", id="number-6", classes="number")
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yield Button("-", id="minus", variant="warning")
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yield Button("1", id="number-1")
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yield Button("2", id="number-2")
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yield Button("3", id="number-3")
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yield Button("1", id="number-1", classes="number")
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yield Button("2", id="number-2", classes="number")
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yield Button("3", id="number-3", classes="number")
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yield Button("+", id="plus", variant="warning")
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yield Button("0", id="number-0")
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yield Button("0", id="number-0", classes="number")
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yield Button(".", id="point")
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yield Button("=", id="equals", variant="warning")
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@@ -75,6 +82,8 @@ class CalculatorApp(App):
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"""Called when the user presses a key."""
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def press(button_id: str) -> None:
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"""Press a button, should it exist."""
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try:
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self.query_one(f"#{button_id}", Button).press()
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except NoMatches:
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@@ -91,54 +100,73 @@ class CalculatorApp(App):
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if button_id is not None:
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press(self.NAME_MAP.get(key, key))
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def on_button_pressed(self, event: Button.Pressed) -> None:
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"""Called when a button is pressed."""
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@on(Button.Pressed, ".number")
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def number_pressed(self, event: Button.Pressed) -> None:
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"""Pressed a number."""
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assert event.button.id is not None
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number = event.button.id.partition("-")[-1]
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self.numbers = self.value = self.value.lstrip("0") + number
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button_id = event.button.id
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assert button_id is not None
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@on(Button.Pressed, "#plus-minus")
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def plus_minus_pressed(self) -> None:
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"""Pressed + / -"""
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self.numbers = self.value = str(Decimal(self.value or "0") * -1)
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def do_math() -> None:
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"""Does the math: LEFT OPERATOR RIGHT"""
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try:
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if self.operator == "plus":
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self.left += self.right
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elif self.operator == "minus":
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self.left -= self.right
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elif self.operator == "divide":
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self.left /= self.right
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elif self.operator == "multiply":
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self.left *= self.right
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self.numbers = str(self.left)
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self.value = ""
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except Exception:
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self.numbers = "Error"
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@on(Button.Pressed, "#percent")
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def percent_pressed(self) -> None:
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"""Pressed %"""
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self.numbers = self.value = str(Decimal(self.value or "0") / Decimal(100))
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if button_id.startswith("number-"):
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number = button_id.partition("-")[-1]
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self.numbers = self.value = self.value.lstrip("0") + number
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elif button_id == "plus-minus":
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self.numbers = self.value = str(Decimal(self.value or "0") * -1)
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elif button_id == "percent":
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self.numbers = self.value = str(Decimal(self.value or "0") / Decimal(100))
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elif button_id == "point":
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if "." not in self.value:
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self.numbers = self.value = (self.value or "0") + "."
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elif button_id == "ac":
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@on(Button.Pressed, "#point")
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def pressed_point(self) -> None:
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"""Pressed ."""
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if "." not in self.value:
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self.numbers = self.value = (self.value or "0") + "."
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@on(Button.Pressed, "#ac")
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def pressed_ac(self) -> None:
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"""Pressed AC"""
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self.value = ""
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self.left = self.right = Decimal(0)
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self.operator = "plus"
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self.numbers = "0"
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@on(Button.Pressed, "#c")
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def pressed_c(self) -> None:
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"""Pressed C"""
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self.value = ""
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self.numbers = "0"
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def _do_math(self) -> None:
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"""Does the math: LEFT OPERATOR RIGHT"""
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try:
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if self.operator == "plus":
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self.left += self.right
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elif self.operator == "minus":
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self.left -= self.right
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elif self.operator == "divide":
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self.left /= self.right
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elif self.operator == "multiply":
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self.left *= self.right
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self.numbers = str(self.left)
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self.value = ""
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self.left = self.right = Decimal(0)
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self.operator = "plus"
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self.numbers = "0"
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elif button_id == "c":
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self.value = ""
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self.numbers = "0"
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elif button_id in ("plus", "minus", "divide", "multiply"):
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self.right = Decimal(self.value or "0")
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do_math()
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self.operator = button_id
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elif button_id == "equals":
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if self.value:
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self.right = Decimal(self.value)
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do_math()
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except Exception:
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self.numbers = "Error"
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@on(Button.Pressed, "#plus,#minus,#divide,#multiply")
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def pressed_op(self, event: Button.Pressed) -> None:
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"""Pressed one of the arithmetic operations."""
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self.right = Decimal(self.value or "0")
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self._do_math()
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assert event.button.id is not None
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self.operator = event.button.id
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@on(Button.Pressed, "#equals")
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def pressed_equals(self) -> None:
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"""Pressed ="""
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if self.value:
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self.right = Decimal(self.value)
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self._do_math()
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if __name__ == "__main__":
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