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input_field

This module contains the InputField class.

Cursor dataclass

Bases: Iterable

A simple dataclass representing the InputField's cursor.

Source code in pytermgui/widgets/input_field.py
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@dataclass
class Cursor(Iterable):
    """A simple dataclass representing the InputField's cursor."""

    row: int
    col: int

    def __iadd__(self, difference: tuple[int, int]) -> Cursor:
        """Move the cursor by the difference."""

        row, col = difference

        self.row += row
        self.col += col

        return self

    def __iter__(self) -> Iterator[int]:
        return iter((self.row, self.col))

    def __len__(self) -> int:
        return 2

__iadd__(difference)

Move the cursor by the difference.

Source code in pytermgui/widgets/input_field.py
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def __iadd__(self, difference: tuple[int, int]) -> Cursor:
    """Move the cursor by the difference."""

    row, col = difference

    self.row += row
    self.col += col

    return self

InputField

Bases: Widget

An element to display user input

Source code in pytermgui/widgets/input_field.py
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class InputField(Widget):  # pylint: disable=too-many-instance-attributes
    """An element to display user input"""

    styles = w_styles.StyleManager(
        value="",
        prompt="surface+2",
        cursor="@primary dim #auto",
    )

    keys = {
        "move_left": {keys.LEFT},
        "move_right": {keys.RIGHT},
        "move_up": {keys.UP},
        "move_down": {keys.DOWN},
        "select_left": {keys.SHIFT_LEFT},
        "select_right": {keys.SHIFT_RIGHT},
        "select_up": {keys.SHIFT_UP},
        "select_down": {keys.SHIFT_DOWN},
    }

    parent_align = HorizontalAlignment.LEFT

    def __init__(
        self,
        value: str = "",
        *,
        prompt: str = "",
        tablength: int = 4,
        multiline: bool = False,
        cursor: Cursor | None = None,
        **attrs: Any,
    ) -> None:
        """Initialize object"""

        super().__init__(**attrs)

        if "width" not in attrs:
            self.width = len(value)

        self.prompt = prompt
        self.height = 1
        self.tablength = tablength
        self.multiline = multiline

        self.cursor = cursor or Cursor(0, len(value))

        self._lines = value.splitlines() or [""]
        self._selection_length = 1

        self._styled_cache: list[str] | None = self._style_and_break_lines()

        self._cached_state: int = self.width
        self._drag_start: tuple[int, int] | None = None

    @property
    def selectables_length(self) -> int:
        """Get length of selectables in object"""

        return 1

    @property
    def value(self) -> str:
        """Returns the internal value of this field."""

        return "\n".join(self._lines)

    @property
    def selection(self) -> str:
        """Returns the currently selected span of text."""

        start, end = sorted([self.cursor.col, self.cursor.col + self._selection_length])
        return self._lines[self.cursor.row][start:end]

    def _cache_is_valid(self) -> bool:
        """Determines if the styled line cache is still usable."""

        return self.width == self._cached_state

    def _style_and_break_lines(self) -> list[str]:
        """Styles and breaks self._lines."""

        document = (
            self.styles.prompt(self.prompt) + self.styles.value(self.value)
        ).splitlines()

        lines: list[str] = []
        width = self.width
        extend = lines.extend

        for line in document:
            extend(break_line(line.replace("\n", "\\n"), width, fill=" "))
            extend("")

        return lines

    def update_selection(self, count: int, correct_zero_length: bool = True) -> None:
        """Updates the selection state.

        Args:
            count: How many characters the cursor should change by. Negative for
                selecting leftward, positive for right.
            correct_zero_length: If set, when the selection length is 0 both the cursor
                and the selection length are manipulated to keep the original selection
                start while moving the selection in more of the way the user might
                expect.
        """

        self._selection_length += count

        if correct_zero_length and abs(self._selection_length) == 0:
            self._selection_length += 2 if count > 0 else -2
            self.move_cursor((0, (-1 if count > 0 else 1)))

    def delete_back(self, count: int = 1) -> str:
        """Deletes `count` characters from the cursor, backwards.

        Args:
            count: How many characters should be deleted.

        Returns:
            The deleted string.
        """

        row, col = self.cursor

        if len(self._lines) <= row:
            return ""

        line = self._lines[row]

        start, end = sorted([col, col - count])
        start = max(0, start)
        self._lines[row] = line[:start] + line[end:]

        self._styled_cache = None

        if self._lines[row] == "":
            self.move_cursor((-1, len(self._lines[row - 1])))

            return self._lines.pop(row)

        if count > 0:
            self.move_cursor((0, -count))

        return line[col - count : col]

    def insert_text(self, text: str) -> None:
        """Inserts text at the cursor location."""

        row, col = self.cursor

        if len(self._lines) <= row:
            self._lines.insert(row, "")

        line = self._lines[row]

        self._lines[row] = line[:col] + text + line[col:]
        self.move_cursor((0, len(text)))

        self._styled_cache = None

    def handle_action(self, action: str) -> bool:
        """Handles some action.

        This will be expanded in the future to allow using all behaviours with
        just their actions.
        """

        cursors = {
            "move_left": (0, -1),
            "move_right": (0, 1),
            "move_up": (-1, 0),
            "move_down": (1, 0),
        }

        if action.startswith("move_"):
            row, col = cursors[action]

            if self.cursor.row + row > len(self._lines):
                self._lines.append("")

            col += self._selection_length
            if self._selection_length > 0:
                col -= 1

            self._selection_length = 1
            self.move_cursor((row, col))
            return True

        if action.startswith("select_"):
            if action == "select_right":
                self.update_selection(1)

            elif action == "select_left":
                self.update_selection(-1)

            return True

        return False

    # TODO: This could probably be simplified by a wider adoption of the action pattern.
    def handle_key(  # pylint: disable=too-many-return-statements, too-many-branches
        self, key: str
    ) -> bool:
        """Adds text to the field, or moves the cursor."""

        if self.execute_binding(key, ignore_any=True):
            return True

        for name, options in self.keys.items():
            if (
                name.rsplit("_", maxsplit=1)[-1] in ("up", "down")
                and not self.multiline
            ):
                continue

            if key in options:
                return self.handle_action(name)

        if key == keys.TAB:
            if not self.multiline:
                return False

            for _ in range(self.tablength):
                self.handle_key(" ")

            return True

        if key in string.printable and key not in "\x0c\x0b":
            if key == keys.ENTER:
                if not self.multiline:
                    return False

                line = self._lines[self.cursor.row]
                left, right = line[: self.cursor.col], line[self.cursor.col :]

                self._lines[self.cursor.row] = left
                self._lines.insert(self.cursor.row + 1, right)

                self.move_cursor((1, -self.cursor.col))
                self._styled_cache = None

            else:
                self.insert_text(key)

            if keys.ANY_KEY in self._bindings:
                method, _ = self._bindings[keys.ANY_KEY]
                method(self, key)

            return True

        if key == keys.BACKSPACE:
            if self._selection_length == 1:
                self.delete_back(1)
            else:
                self.delete_back(-self._selection_length)

            # self.handle_action("move_left")

            # if self._selection_length == 1:

            self._selection_length = 1
            self._styled_cache = None

            return True

        return False

    def handle_mouse(self, event: MouseEvent) -> bool:
        """Allows point-and-click selection."""

        x_offset = event.position[0] - self.pos[0]
        y_offset = event.position[1] - self.pos[1]

        if y_offset == 0:
            x_offset -= len(self.prompt)

            if x_offset < 0:
                return False

        # Set cursor to mouse location
        if event.action is MouseAction.LEFT_CLICK:
            if not y_offset < len(self._lines):
                return False

            line = self._lines[y_offset]

            if y_offset == 0:
                line = self.prompt + line

            self.move_cursor((y_offset, min(len(line), x_offset)), absolute=True)

            self._drag_start = (x_offset, y_offset)
            self._selection_length = 1

            return True

        # Select text using dragging the mouse
        if event.action is MouseAction.LEFT_DRAG and self._drag_start is not None:
            change = x_offset - self._drag_start[0]
            self.update_selection(
                change - self._selection_length + 1, correct_zero_length=False
            )

            return True

        return super().handle_mouse(event)

    def move_cursor(self, new: tuple[int, int], *, absolute: bool = False) -> None:
        """Moves the cursor, then possible re-positions it to a valid location.

        Args:
            new: The new set of (y, x) positions to use.
            absolute: If set, `new` will be interpreted as absolute coordinates,
                instead of being added on top of the current ones.
        """

        if len(self._lines) == 0:
            return

        if absolute:
            new_y, new_x = new
            self.cursor.row = new_y
            self.cursor.col = new_x

        else:
            self.cursor += new

        self.cursor.row = max(0, min(self.cursor.row, len(self._lines) - 1))
        row, col = self.cursor

        line = self._lines[row]

        # Going left, possibly upwards
        if col < 0:
            if row <= 0:
                self.cursor.col = 0

            else:
                self.cursor.row -= 1
                line = self._lines[self.cursor.row]
                self.cursor.col = len(line)

        # Going right, possibly downwards
        elif col > len(line) and line != "":
            if len(self._lines) > row + 1:
                self.cursor.row += 1
                self.cursor.col = 0

            line = self._lines[self.cursor.row]

        self.cursor.col = max(0, min(self.cursor.col, len(line)))

    def get_lines(self) -> list[str]:
        """Builds the input field's lines."""

        if not self._cache_is_valid() or self._styled_cache is None:
            self._styled_cache = self._style_and_break_lines()

        lines = self._styled_cache

        row, col = self.cursor

        if len(self._lines) == 0:
            line = " "
        else:
            line = self._lines[row]

        start = col
        cursor_char = " "
        if len(line) > col:
            start = col
            end = col + self._selection_length
            start, end = sorted([start, end])

            try:
                cursor_char = line[start:end]
            except IndexError as error:
                raise ValueError(f"Invalid index in {line!r}: {col}") from error

        style_cursor = (
            self.styles.value if self.selected_index is None else self.styles.cursor
        )

        # TODO: This is horribly hackish, but is the only way to "get around" the
        #       limits of the current scrolling techniques. Should be refactored
        #       once a better solution is available
        if self.parent is not None and self.selected_index is not None:
            offset = 0
            parent = self.parent
            while hasattr(parent, "parent"):
                offset += getattr(parent, "_scroll_offset")

                parent = parent.parent  # type: ignore

            offset_row = -offset + row
            offset_col = start + (len(self.prompt) if row == 0 else 0)

            if offset_col > self.width - 1:
                offset_col -= self.width
                offset_row += 1
                row += 1

                if row >= len(lines):
                    lines.append(self.styles.value(""))

            position = (
                self.pos[0] + offset_col,
                self.pos[1] + offset_row,
            )

            self.positioned_line_buffer.append(
                (position, style_cursor(cursor_char))  # type: ignore
            )

        lines = lines or [""]
        self.height = len(lines)

        return lines

__init__(value='', *, prompt='', tablength=4, multiline=False, cursor=None, attrs)

Initialize object

Source code in pytermgui/widgets/input_field.py
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def __init__(
    self,
    value: str = "",
    *,
    prompt: str = "",
    tablength: int = 4,
    multiline: bool = False,
    cursor: Cursor | None = None,
    **attrs: Any,
) -> None:
    """Initialize object"""

    super().__init__(**attrs)

    if "width" not in attrs:
        self.width = len(value)

    self.prompt = prompt
    self.height = 1
    self.tablength = tablength
    self.multiline = multiline

    self.cursor = cursor or Cursor(0, len(value))

    self._lines = value.splitlines() or [""]
    self._selection_length = 1

    self._styled_cache: list[str] | None = self._style_and_break_lines()

    self._cached_state: int = self.width
    self._drag_start: tuple[int, int] | None = None

delete_back(count=1)

Deletes count characters from the cursor, backwards.

Parameters:

Name Type Description Default
count int

How many characters should be deleted.

1

Returns:

Type Description
str

The deleted string.

Source code in pytermgui/widgets/input_field.py
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def delete_back(self, count: int = 1) -> str:
    """Deletes `count` characters from the cursor, backwards.

    Args:
        count: How many characters should be deleted.

    Returns:
        The deleted string.
    """

    row, col = self.cursor

    if len(self._lines) <= row:
        return ""

    line = self._lines[row]

    start, end = sorted([col, col - count])
    start = max(0, start)
    self._lines[row] = line[:start] + line[end:]

    self._styled_cache = None

    if self._lines[row] == "":
        self.move_cursor((-1, len(self._lines[row - 1])))

        return self._lines.pop(row)

    if count > 0:
        self.move_cursor((0, -count))

    return line[col - count : col]

get_lines()

Builds the input field's lines.

Source code in pytermgui/widgets/input_field.py
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def get_lines(self) -> list[str]:
    """Builds the input field's lines."""

    if not self._cache_is_valid() or self._styled_cache is None:
        self._styled_cache = self._style_and_break_lines()

    lines = self._styled_cache

    row, col = self.cursor

    if len(self._lines) == 0:
        line = " "
    else:
        line = self._lines[row]

    start = col
    cursor_char = " "
    if len(line) > col:
        start = col
        end = col + self._selection_length
        start, end = sorted([start, end])

        try:
            cursor_char = line[start:end]
        except IndexError as error:
            raise ValueError(f"Invalid index in {line!r}: {col}") from error

    style_cursor = (
        self.styles.value if self.selected_index is None else self.styles.cursor
    )

    # TODO: This is horribly hackish, but is the only way to "get around" the
    #       limits of the current scrolling techniques. Should be refactored
    #       once a better solution is available
    if self.parent is not None and self.selected_index is not None:
        offset = 0
        parent = self.parent
        while hasattr(parent, "parent"):
            offset += getattr(parent, "_scroll_offset")

            parent = parent.parent  # type: ignore

        offset_row = -offset + row
        offset_col = start + (len(self.prompt) if row == 0 else 0)

        if offset_col > self.width - 1:
            offset_col -= self.width
            offset_row += 1
            row += 1

            if row >= len(lines):
                lines.append(self.styles.value(""))

        position = (
            self.pos[0] + offset_col,
            self.pos[1] + offset_row,
        )

        self.positioned_line_buffer.append(
            (position, style_cursor(cursor_char))  # type: ignore
        )

    lines = lines or [""]
    self.height = len(lines)

    return lines

handle_action(action)

Handles some action.

This will be expanded in the future to allow using all behaviours with just their actions.

Source code in pytermgui/widgets/input_field.py
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def handle_action(self, action: str) -> bool:
    """Handles some action.

    This will be expanded in the future to allow using all behaviours with
    just their actions.
    """

    cursors = {
        "move_left": (0, -1),
        "move_right": (0, 1),
        "move_up": (-1, 0),
        "move_down": (1, 0),
    }

    if action.startswith("move_"):
        row, col = cursors[action]

        if self.cursor.row + row > len(self._lines):
            self._lines.append("")

        col += self._selection_length
        if self._selection_length > 0:
            col -= 1

        self._selection_length = 1
        self.move_cursor((row, col))
        return True

    if action.startswith("select_"):
        if action == "select_right":
            self.update_selection(1)

        elif action == "select_left":
            self.update_selection(-1)

        return True

    return False

handle_key(key)

Adds text to the field, or moves the cursor.

Source code in pytermgui/widgets/input_field.py
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def handle_key(  # pylint: disable=too-many-return-statements, too-many-branches
    self, key: str
) -> bool:
    """Adds text to the field, or moves the cursor."""

    if self.execute_binding(key, ignore_any=True):
        return True

    for name, options in self.keys.items():
        if (
            name.rsplit("_", maxsplit=1)[-1] in ("up", "down")
            and not self.multiline
        ):
            continue

        if key in options:
            return self.handle_action(name)

    if key == keys.TAB:
        if not self.multiline:
            return False

        for _ in range(self.tablength):
            self.handle_key(" ")

        return True

    if key in string.printable and key not in "\x0c\x0b":
        if key == keys.ENTER:
            if not self.multiline:
                return False

            line = self._lines[self.cursor.row]
            left, right = line[: self.cursor.col], line[self.cursor.col :]

            self._lines[self.cursor.row] = left
            self._lines.insert(self.cursor.row + 1, right)

            self.move_cursor((1, -self.cursor.col))
            self._styled_cache = None

        else:
            self.insert_text(key)

        if keys.ANY_KEY in self._bindings:
            method, _ = self._bindings[keys.ANY_KEY]
            method(self, key)

        return True

    if key == keys.BACKSPACE:
        if self._selection_length == 1:
            self.delete_back(1)
        else:
            self.delete_back(-self._selection_length)

        # self.handle_action("move_left")

        # if self._selection_length == 1:

        self._selection_length = 1
        self._styled_cache = None

        return True

    return False

handle_mouse(event)

Allows point-and-click selection.

Source code in pytermgui/widgets/input_field.py
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def handle_mouse(self, event: MouseEvent) -> bool:
    """Allows point-and-click selection."""

    x_offset = event.position[0] - self.pos[0]
    y_offset = event.position[1] - self.pos[1]

    if y_offset == 0:
        x_offset -= len(self.prompt)

        if x_offset < 0:
            return False

    # Set cursor to mouse location
    if event.action is MouseAction.LEFT_CLICK:
        if not y_offset < len(self._lines):
            return False

        line = self._lines[y_offset]

        if y_offset == 0:
            line = self.prompt + line

        self.move_cursor((y_offset, min(len(line), x_offset)), absolute=True)

        self._drag_start = (x_offset, y_offset)
        self._selection_length = 1

        return True

    # Select text using dragging the mouse
    if event.action is MouseAction.LEFT_DRAG and self._drag_start is not None:
        change = x_offset - self._drag_start[0]
        self.update_selection(
            change - self._selection_length + 1, correct_zero_length=False
        )

        return True

    return super().handle_mouse(event)

insert_text(text)

Inserts text at the cursor location.

Source code in pytermgui/widgets/input_field.py
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def insert_text(self, text: str) -> None:
    """Inserts text at the cursor location."""

    row, col = self.cursor

    if len(self._lines) <= row:
        self._lines.insert(row, "")

    line = self._lines[row]

    self._lines[row] = line[:col] + text + line[col:]
    self.move_cursor((0, len(text)))

    self._styled_cache = None

move_cursor(new, *, absolute=False)

Moves the cursor, then possible re-positions it to a valid location.

Parameters:

Name Type Description Default
new tuple[int, int]

The new set of (y, x) positions to use.

required
absolute bool

If set, new will be interpreted as absolute coordinates, instead of being added on top of the current ones.

False
Source code in pytermgui/widgets/input_field.py
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def move_cursor(self, new: tuple[int, int], *, absolute: bool = False) -> None:
    """Moves the cursor, then possible re-positions it to a valid location.

    Args:
        new: The new set of (y, x) positions to use.
        absolute: If set, `new` will be interpreted as absolute coordinates,
            instead of being added on top of the current ones.
    """

    if len(self._lines) == 0:
        return

    if absolute:
        new_y, new_x = new
        self.cursor.row = new_y
        self.cursor.col = new_x

    else:
        self.cursor += new

    self.cursor.row = max(0, min(self.cursor.row, len(self._lines) - 1))
    row, col = self.cursor

    line = self._lines[row]

    # Going left, possibly upwards
    if col < 0:
        if row <= 0:
            self.cursor.col = 0

        else:
            self.cursor.row -= 1
            line = self._lines[self.cursor.row]
            self.cursor.col = len(line)

    # Going right, possibly downwards
    elif col > len(line) and line != "":
        if len(self._lines) > row + 1:
            self.cursor.row += 1
            self.cursor.col = 0

        line = self._lines[self.cursor.row]

    self.cursor.col = max(0, min(self.cursor.col, len(line)))

selectables_length() property

Get length of selectables in object

Source code in pytermgui/widgets/input_field.py
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@property
def selectables_length(self) -> int:
    """Get length of selectables in object"""

    return 1

selection() property

Returns the currently selected span of text.

Source code in pytermgui/widgets/input_field.py
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@property
def selection(self) -> str:
    """Returns the currently selected span of text."""

    start, end = sorted([self.cursor.col, self.cursor.col + self._selection_length])
    return self._lines[self.cursor.row][start:end]

update_selection(count, correct_zero_length=True)

Updates the selection state.

Parameters:

Name Type Description Default
count int

How many characters the cursor should change by. Negative for selecting leftward, positive for right.

required
correct_zero_length bool

If set, when the selection length is 0 both the cursor and the selection length are manipulated to keep the original selection start while moving the selection in more of the way the user might expect.

True
Source code in pytermgui/widgets/input_field.py
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def update_selection(self, count: int, correct_zero_length: bool = True) -> None:
    """Updates the selection state.

    Args:
        count: How many characters the cursor should change by. Negative for
            selecting leftward, positive for right.
        correct_zero_length: If set, when the selection length is 0 both the cursor
            and the selection length are manipulated to keep the original selection
            start while moving the selection in more of the way the user might
            expect.
    """

    self._selection_length += count

    if correct_zero_length and abs(self._selection_length) == 0:
        self._selection_length += 2 if count > 0 else -2
        self.move_cursor((0, (-1 if count > 0 else 1)))

value() property

Returns the internal value of this field.

Source code in pytermgui/widgets/input_field.py
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@property
def value(self) -> str:
    """Returns the internal value of this field."""

    return "\n".join(self._lines)