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Diffstat (limited to 'src/prompt_toolkit/layout/controls.py')
| -rw-r--r-- | src/prompt_toolkit/layout/controls.py | 957 |
1 files changed, 957 insertions, 0 deletions
diff --git a/src/prompt_toolkit/layout/controls.py b/src/prompt_toolkit/layout/controls.py new file mode 100644 index 0000000..016d289 --- /dev/null +++ b/src/prompt_toolkit/layout/controls.py @@ -0,0 +1,957 @@ +""" +User interface Controls for the layout. +""" +import time +from abc import ABCMeta, abstractmethod +from typing import ( + TYPE_CHECKING, + Callable, + Dict, + Hashable, + Iterable, + List, + NamedTuple, + Optional, + Union, +) + +from prompt_toolkit.application.current import get_app +from prompt_toolkit.buffer import Buffer +from prompt_toolkit.cache import SimpleCache +from prompt_toolkit.data_structures import Point +from prompt_toolkit.document import Document +from prompt_toolkit.filters import FilterOrBool, to_filter +from prompt_toolkit.formatted_text import ( + AnyFormattedText, + StyleAndTextTuples, + to_formatted_text, +) +from prompt_toolkit.formatted_text.utils import ( + fragment_list_to_text, + fragment_list_width, + split_lines, +) +from prompt_toolkit.lexers import Lexer, SimpleLexer +from prompt_toolkit.mouse_events import MouseButton, MouseEvent, MouseEventType +from prompt_toolkit.search import SearchState +from prompt_toolkit.selection import SelectionType +from prompt_toolkit.utils import get_cwidth + +from .processors import ( + DisplayMultipleCursors, + HighlightIncrementalSearchProcessor, + HighlightSearchProcessor, + HighlightSelectionProcessor, + Processor, + TransformationInput, + merge_processors, +) + +if TYPE_CHECKING: + from prompt_toolkit.key_binding.key_bindings import ( + KeyBindingsBase, + NotImplementedOrNone, + ) + from prompt_toolkit.utils import Event + + +__all__ = [ + "BufferControl", + "SearchBufferControl", + "DummyControl", + "FormattedTextControl", + "UIControl", + "UIContent", +] + +GetLinePrefixCallable = Callable[[int, int], AnyFormattedText] + + +class UIControl(metaclass=ABCMeta): + """ + Base class for all user interface controls. + """ + + def reset(self) -> None: + # Default reset. (Doesn't have to be implemented.) + pass + + def preferred_width(self, max_available_width: int) -> Optional[int]: + return None + + def preferred_height( + self, + width: int, + max_available_height: int, + wrap_lines: bool, + get_line_prefix: Optional[GetLinePrefixCallable], + ) -> Optional[int]: + return None + + def is_focusable(self) -> bool: + """ + Tell whether this user control is focusable. + """ + return False + + @abstractmethod + def create_content(self, width: int, height: int) -> "UIContent": + """ + Generate the content for this user control. + + Returns a :class:`.UIContent` instance. + """ + + def mouse_handler(self, mouse_event: MouseEvent) -> "NotImplementedOrNone": + """ + Handle mouse events. + + When `NotImplemented` is returned, it means that the given event is not + handled by the `UIControl` itself. The `Window` or key bindings can + decide to handle this event as scrolling or changing focus. + + :param mouse_event: `MouseEvent` instance. + """ + return NotImplemented + + def move_cursor_down(self) -> None: + """ + Request to move the cursor down. + This happens when scrolling down and the cursor is completely at the + top. + """ + + def move_cursor_up(self) -> None: + """ + Request to move the cursor up. + """ + + def get_key_bindings(self) -> Optional["KeyBindingsBase"]: + """ + The key bindings that are specific for this user control. + + Return a :class:`.KeyBindings` object if some key bindings are + specified, or `None` otherwise. + """ + + def get_invalidate_events(self) -> Iterable["Event[object]"]: + """ + Return a list of `Event` objects. This can be a generator. + (The application collects all these events, in order to bind redraw + handlers to these events.) + """ + return [] + + +class UIContent: + """ + Content generated by a user control. This content consists of a list of + lines. + + :param get_line: Callable that takes a line number and returns the current + line. This is a list of (style_str, text) tuples. + :param line_count: The number of lines. + :param cursor_position: a :class:`.Point` for the cursor position. + :param menu_position: a :class:`.Point` for the menu position. + :param show_cursor: Make the cursor visible. + """ + + def __init__( + self, + get_line: Callable[[int], StyleAndTextTuples] = (lambda i: []), + line_count: int = 0, + cursor_position: Optional[Point] = None, + menu_position: Optional[Point] = None, + show_cursor: bool = True, + ): + + self.get_line = get_line + self.line_count = line_count + self.cursor_position = cursor_position or Point(x=0, y=0) + self.menu_position = menu_position + self.show_cursor = show_cursor + + # Cache for line heights. Maps cache key -> height + self._line_heights_cache: Dict[Hashable, int] = {} + + def __getitem__(self, lineno: int) -> StyleAndTextTuples: + "Make it iterable (iterate line by line)." + if lineno < self.line_count: + return self.get_line(lineno) + else: + raise IndexError + + def get_height_for_line( + self, + lineno: int, + width: int, + get_line_prefix: Optional[GetLinePrefixCallable], + slice_stop: Optional[int] = None, + ) -> int: + """ + Return the height that a given line would need if it is rendered in a + space with the given width (using line wrapping). + + :param get_line_prefix: None or a `Window.get_line_prefix` callable + that returns the prefix to be inserted before this line. + :param slice_stop: Wrap only "line[:slice_stop]" and return that + partial result. This is needed for scrolling the window correctly + when line wrapping. + :returns: The computed height. + """ + # Instead of using `get_line_prefix` as key, we use render_counter + # instead. This is more reliable, because this function could still be + # the same, while the content would change over time. + key = get_app().render_counter, lineno, width, slice_stop + + try: + return self._line_heights_cache[key] + except KeyError: + if width == 0: + height = 10**8 + else: + # Calculate line width first. + line = fragment_list_to_text(self.get_line(lineno))[:slice_stop] + text_width = get_cwidth(line) + + if get_line_prefix: + # Add prefix width. + text_width += fragment_list_width( + to_formatted_text(get_line_prefix(lineno, 0)) + ) + + # Slower path: compute path when there's a line prefix. + height = 1 + + # Keep wrapping as long as the line doesn't fit. + # Keep adding new prefixes for every wrapped line. + while text_width > width: + height += 1 + text_width -= width + + fragments2 = to_formatted_text( + get_line_prefix(lineno, height - 1) + ) + prefix_width = get_cwidth(fragment_list_to_text(fragments2)) + + if prefix_width >= width: # Prefix doesn't fit. + height = 10**8 + break + + text_width += prefix_width + else: + # Fast path: compute height when there's no line prefix. + try: + quotient, remainder = divmod(text_width, width) + except ZeroDivisionError: + height = 10**8 + else: + if remainder: + quotient += 1 # Like math.ceil. + height = max(1, quotient) + + # Cache and return + self._line_heights_cache[key] = height + return height + + +class FormattedTextControl(UIControl): + """ + Control that displays formatted text. This can be either plain text, an + :class:`~prompt_toolkit.formatted_text.HTML` object an + :class:`~prompt_toolkit.formatted_text.ANSI` object, a list of ``(style_str, + text)`` tuples or a callable that takes no argument and returns one of + those, depending on how you prefer to do the formatting. See + ``prompt_toolkit.layout.formatted_text`` for more information. + + (It's mostly optimized for rather small widgets, like toolbars, menus, etc...) + + When this UI control has the focus, the cursor will be shown in the upper + left corner of this control by default. There are two ways for specifying + the cursor position: + + - Pass a `get_cursor_position` function which returns a `Point` instance + with the current cursor position. + + - If the (formatted) text is passed as a list of ``(style, text)`` tuples + and there is one that looks like ``('[SetCursorPosition]', '')``, then + this will specify the cursor position. + + Mouse support: + + The list of fragments can also contain tuples of three items, looking like: + (style_str, text, handler). When mouse support is enabled and the user + clicks on this fragment, then the given handler is called. That handler + should accept two inputs: (Application, MouseEvent) and it should + either handle the event or return `NotImplemented` in case we want the + containing Window to handle this event. + + :param focusable: `bool` or :class:`.Filter`: Tell whether this control is + focusable. + + :param text: Text or formatted text to be displayed. + :param style: Style string applied to the content. (If you want to style + the whole :class:`~prompt_toolkit.layout.Window`, pass the style to the + :class:`~prompt_toolkit.layout.Window` instead.) + :param key_bindings: a :class:`.KeyBindings` object. + :param get_cursor_position: A callable that returns the cursor position as + a `Point` instance. + """ + + def __init__( + self, + text: AnyFormattedText = "", + style: str = "", + focusable: FilterOrBool = False, + key_bindings: Optional["KeyBindingsBase"] = None, + show_cursor: bool = True, + modal: bool = False, + get_cursor_position: Optional[Callable[[], Optional[Point]]] = None, + ) -> None: + + self.text = text # No type check on 'text'. This is done dynamically. + self.style = style + self.focusable = to_filter(focusable) + + # Key bindings. + self.key_bindings = key_bindings + self.show_cursor = show_cursor + self.modal = modal + self.get_cursor_position = get_cursor_position + + #: Cache for the content. + self._content_cache: SimpleCache[Hashable, UIContent] = SimpleCache(maxsize=18) + self._fragment_cache: SimpleCache[int, StyleAndTextTuples] = SimpleCache( + maxsize=1 + ) + # Only cache one fragment list. We don't need the previous item. + + # Render info for the mouse support. + self._fragments: Optional[StyleAndTextTuples] = None + + def reset(self) -> None: + self._fragments = None + + def is_focusable(self) -> bool: + return self.focusable() + + def __repr__(self) -> str: + return f"{self.__class__.__name__}({self.text!r})" + + def _get_formatted_text_cached(self) -> StyleAndTextTuples: + """ + Get fragments, but only retrieve fragments once during one render run. + (This function is called several times during one rendering, because + we also need those for calculating the dimensions.) + """ + return self._fragment_cache.get( + get_app().render_counter, lambda: to_formatted_text(self.text, self.style) + ) + + def preferred_width(self, max_available_width: int) -> int: + """ + Return the preferred width for this control. + That is the width of the longest line. + """ + text = fragment_list_to_text(self._get_formatted_text_cached()) + line_lengths = [get_cwidth(l) for l in text.split("\n")] + return max(line_lengths) + + def preferred_height( + self, + width: int, + max_available_height: int, + wrap_lines: bool, + get_line_prefix: Optional[GetLinePrefixCallable], + ) -> Optional[int]: + """ + Return the preferred height for this control. + """ + content = self.create_content(width, None) + if wrap_lines: + height = 0 + for i in range(content.line_count): + height += content.get_height_for_line(i, width, get_line_prefix) + if height >= max_available_height: + return max_available_height + return height + else: + return content.line_count + + def create_content(self, width: int, height: Optional[int]) -> UIContent: + # Get fragments + fragments_with_mouse_handlers = self._get_formatted_text_cached() + fragment_lines_with_mouse_handlers = list( + split_lines(fragments_with_mouse_handlers) + ) + + # Strip mouse handlers from fragments. + fragment_lines: List[StyleAndTextTuples] = [ + [(item[0], item[1]) for item in line] + for line in fragment_lines_with_mouse_handlers + ] + + # Keep track of the fragments with mouse handler, for later use in + # `mouse_handler`. + self._fragments = fragments_with_mouse_handlers + + # If there is a `[SetCursorPosition]` in the fragment list, set the + # cursor position here. + def get_cursor_position( + fragment: str = "[SetCursorPosition]", + ) -> Optional[Point]: + for y, line in enumerate(fragment_lines): + x = 0 + for style_str, text, *_ in line: + if fragment in style_str: + return Point(x=x, y=y) + x += len(text) + return None + + # If there is a `[SetMenuPosition]`, set the menu over here. + def get_menu_position() -> Optional[Point]: + return get_cursor_position("[SetMenuPosition]") + + cursor_position = (self.get_cursor_position or get_cursor_position)() + + # Create content, or take it from the cache. + key = (tuple(fragments_with_mouse_handlers), width, cursor_position) + + def get_content() -> UIContent: + return UIContent( + get_line=lambda i: fragment_lines[i], + line_count=len(fragment_lines), + show_cursor=self.show_cursor, + cursor_position=cursor_position, + menu_position=get_menu_position(), + ) + + return self._content_cache.get(key, get_content) + + def mouse_handler(self, mouse_event: MouseEvent) -> "NotImplementedOrNone": + """ + Handle mouse events. + + (When the fragment list contained mouse handlers and the user clicked on + on any of these, the matching handler is called. This handler can still + return `NotImplemented` in case we want the + :class:`~prompt_toolkit.layout.Window` to handle this particular + event.) + """ + if self._fragments: + # Read the generator. + fragments_for_line = list(split_lines(self._fragments)) + + try: + fragments = fragments_for_line[mouse_event.position.y] + except IndexError: + return NotImplemented + else: + # Find position in the fragment list. + xpos = mouse_event.position.x + + # Find mouse handler for this character. + count = 0 + for item in fragments: + count += len(item[1]) + if count > xpos: + if len(item) >= 3: + # Handler found. Call it. + # (Handler can return NotImplemented, so return + # that result.) + handler = item[2] # type: ignore + return handler(mouse_event) + else: + break + + # Otherwise, don't handle here. + return NotImplemented + + def is_modal(self) -> bool: + return self.modal + + def get_key_bindings(self) -> Optional["KeyBindingsBase"]: + return self.key_bindings + + +class DummyControl(UIControl): + """ + A dummy control object that doesn't paint any content. + + Useful for filling a :class:`~prompt_toolkit.layout.Window`. (The + `fragment` and `char` attributes of the `Window` class can be used to + define the filling.) + """ + + def create_content(self, width: int, height: int) -> UIContent: + def get_line(i: int) -> StyleAndTextTuples: + return [] + + return UIContent( + get_line=get_line, line_count=100**100 + ) # Something very big. + + def is_focusable(self) -> bool: + return False + + +class _ProcessedLine(NamedTuple): + fragments: StyleAndTextTuples + source_to_display: Callable[[int], int] + display_to_source: Callable[[int], int] + + +class BufferControl(UIControl): + """ + Control for visualising the content of a :class:`.Buffer`. + + :param buffer: The :class:`.Buffer` object to be displayed. + :param input_processors: A list of + :class:`~prompt_toolkit.layout.processors.Processor` objects. + :param include_default_input_processors: When True, include the default + processors for highlighting of selection, search and displaying of + multiple cursors. + :param lexer: :class:`.Lexer` instance for syntax highlighting. + :param preview_search: `bool` or :class:`.Filter`: Show search while + typing. When this is `True`, probably you want to add a + ``HighlightIncrementalSearchProcessor`` as well. Otherwise only the + cursor position will move, but the text won't be highlighted. + :param focusable: `bool` or :class:`.Filter`: Tell whether this control is focusable. + :param focus_on_click: Focus this buffer when it's click, but not yet focused. + :param key_bindings: a :class:`.KeyBindings` object. + """ + + def __init__( + self, + buffer: Optional[Buffer] = None, + input_processors: Optional[List[Processor]] = None, + include_default_input_processors: bool = True, + lexer: Optional[Lexer] = None, + preview_search: FilterOrBool = False, + focusable: FilterOrBool = True, + search_buffer_control: Union[ + None, "SearchBufferControl", Callable[[], "SearchBufferControl"] + ] = None, + menu_position: Optional[Callable[[], Optional[int]]] = None, + focus_on_click: FilterOrBool = False, + key_bindings: Optional["KeyBindingsBase"] = None, + ): + + self.input_processors = input_processors + self.include_default_input_processors = include_default_input_processors + + self.default_input_processors = [ + HighlightSearchProcessor(), + HighlightIncrementalSearchProcessor(), + HighlightSelectionProcessor(), + DisplayMultipleCursors(), + ] + + self.preview_search = to_filter(preview_search) + self.focusable = to_filter(focusable) + self.focus_on_click = to_filter(focus_on_click) + + self.buffer = buffer or Buffer() + self.menu_position = menu_position + self.lexer = lexer or SimpleLexer() + self.key_bindings = key_bindings + self._search_buffer_control = search_buffer_control + + #: Cache for the lexer. + #: Often, due to cursor movement, undo/redo and window resizing + #: operations, it happens that a short time, the same document has to be + #: lexed. This is a fairly easy way to cache such an expensive operation. + self._fragment_cache: SimpleCache[ + Hashable, Callable[[int], StyleAndTextTuples] + ] = SimpleCache(maxsize=8) + + self._last_click_timestamp: Optional[float] = None + self._last_get_processed_line: Optional[Callable[[int], _ProcessedLine]] = None + + def __repr__(self) -> str: + return f"<{self.__class__.__name__} buffer={self.buffer!r} at {id(self)!r}>" + + @property + def search_buffer_control(self) -> Optional["SearchBufferControl"]: + result: Optional[SearchBufferControl] + + if callable(self._search_buffer_control): + result = self._search_buffer_control() + else: + result = self._search_buffer_control + + assert result is None or isinstance(result, SearchBufferControl) + return result + + @property + def search_buffer(self) -> Optional[Buffer]: + control = self.search_buffer_control + if control is not None: + return control.buffer + return None + + @property + def search_state(self) -> SearchState: + """ + Return the `SearchState` for searching this `BufferControl`. This is + always associated with the search control. If one search bar is used + for searching multiple `BufferControls`, then they share the same + `SearchState`. + """ + search_buffer_control = self.search_buffer_control + if search_buffer_control: + return search_buffer_control.searcher_search_state + else: + return SearchState() + + def is_focusable(self) -> bool: + return self.focusable() + + def preferred_width(self, max_available_width: int) -> Optional[int]: + """ + This should return the preferred width. + + Note: We don't specify a preferred width according to the content, + because it would be too expensive. Calculating the preferred + width can be done by calculating the longest line, but this would + require applying all the processors to each line. This is + unfeasible for a larger document, and doing it for small + documents only would result in inconsistent behaviour. + """ + return None + + def preferred_height( + self, + width: int, + max_available_height: int, + wrap_lines: bool, + get_line_prefix: Optional[GetLinePrefixCallable], + ) -> Optional[int]: + + # Calculate the content height, if it was drawn on a screen with the + # given width. + height = 0 + content = self.create_content(width, height=1) # Pass a dummy '1' as height. + + # When line wrapping is off, the height should be equal to the amount + # of lines. + if not wrap_lines: + return content.line_count + + # When the number of lines exceeds the max_available_height, just + # return max_available_height. No need to calculate anything. + if content.line_count >= max_available_height: + return max_available_height + + for i in range(content.line_count): + height += content.get_height_for_line(i, width, get_line_prefix) + + if height >= max_available_height: + return max_available_height + + return height + + def _get_formatted_text_for_line_func( + self, document: Document + ) -> Callable[[int], StyleAndTextTuples]: + """ + Create a function that returns the fragments for a given line. + """ + # Cache using `document.text`. + def get_formatted_text_for_line() -> Callable[[int], StyleAndTextTuples]: + return self.lexer.lex_document(document) + + key = (document.text, self.lexer.invalidation_hash()) + return self._fragment_cache.get(key, get_formatted_text_for_line) + + def _create_get_processed_line_func( + self, document: Document, width: int, height: int + ) -> Callable[[int], _ProcessedLine]: + """ + Create a function that takes a line number of the current document and + returns a _ProcessedLine(processed_fragments, source_to_display, display_to_source) + tuple. + """ + # Merge all input processors together. + input_processors = self.input_processors or [] + if self.include_default_input_processors: + input_processors = self.default_input_processors + input_processors + + merged_processor = merge_processors(input_processors) + + def transform(lineno: int, fragments: StyleAndTextTuples) -> _ProcessedLine: + "Transform the fragments for a given line number." + # Get cursor position at this line. + def source_to_display(i: int) -> int: + """X position from the buffer to the x position in the + processed fragment list. By default, we start from the 'identity' + operation.""" + return i + + transformation = merged_processor.apply_transformation( + TransformationInput( + self, document, lineno, source_to_display, fragments, width, height + ) + ) + + return _ProcessedLine( + transformation.fragments, + transformation.source_to_display, + transformation.display_to_source, + ) + + def create_func() -> Callable[[int], _ProcessedLine]: + get_line = self._get_formatted_text_for_line_func(document) + cache: Dict[int, _ProcessedLine] = {} + + def get_processed_line(i: int) -> _ProcessedLine: + try: + return cache[i] + except KeyError: + processed_line = transform(i, get_line(i)) + cache[i] = processed_line + return processed_line + + return get_processed_line + + return create_func() + + def create_content( + self, width: int, height: int, preview_search: bool = False + ) -> UIContent: + """ + Create a UIContent. + """ + buffer = self.buffer + + # Trigger history loading of the buffer. We do this during the + # rendering of the UI here, because it needs to happen when an + # `Application` with its event loop is running. During the rendering of + # the buffer control is the earliest place we can achieve this, where + # we're sure the right event loop is active, and don't require user + # interaction (like in a key binding). + buffer.load_history_if_not_yet_loaded() + + # Get the document to be shown. If we are currently searching (the + # search buffer has focus, and the preview_search filter is enabled), + # then use the search document, which has possibly a different + # text/cursor position.) + search_control = self.search_buffer_control + preview_now = preview_search or bool( + # Only if this feature is enabled. + self.preview_search() + and + # And something was typed in the associated search field. + search_control + and search_control.buffer.text + and + # And we are searching in this control. (Many controls can point to + # the same search field, like in Pyvim.) + get_app().layout.search_target_buffer_control == self + ) + + if preview_now and search_control is not None: + ss = self.search_state + + document = buffer.document_for_search( + SearchState( + text=search_control.buffer.text, + direction=ss.direction, + ignore_case=ss.ignore_case, + ) + ) + else: + document = buffer.document + + get_processed_line = self._create_get_processed_line_func( + document, width, height + ) + self._last_get_processed_line = get_processed_line + + def translate_rowcol(row: int, col: int) -> Point: + "Return the content column for this coordinate." + return Point(x=get_processed_line(row).source_to_display(col), y=row) + + def get_line(i: int) -> StyleAndTextTuples: + "Return the fragments for a given line number." + fragments = get_processed_line(i).fragments + + # Add a space at the end, because that is a possible cursor + # position. (When inserting after the input.) We should do this on + # all the lines, not just the line containing the cursor. (Because + # otherwise, line wrapping/scrolling could change when moving the + # cursor around.) + fragments = fragments + [("", " ")] + return fragments + + content = UIContent( + get_line=get_line, + line_count=document.line_count, + cursor_position=translate_rowcol( + document.cursor_position_row, document.cursor_position_col + ), + ) + + # If there is an auto completion going on, use that start point for a + # pop-up menu position. (But only when this buffer has the focus -- + # there is only one place for a menu, determined by the focused buffer.) + if get_app().layout.current_control == self: + menu_position = self.menu_position() if self.menu_position else None + if menu_position is not None: + assert isinstance(menu_position, int) + menu_row, menu_col = buffer.document.translate_index_to_position( + menu_position + ) + content.menu_position = translate_rowcol(menu_row, menu_col) + elif buffer.complete_state: + # Position for completion menu. + # Note: We use 'min', because the original cursor position could be + # behind the input string when the actual completion is for + # some reason shorter than the text we had before. (A completion + # can change and shorten the input.) + menu_row, menu_col = buffer.document.translate_index_to_position( + min( + buffer.cursor_position, + buffer.complete_state.original_document.cursor_position, + ) + ) + content.menu_position = translate_rowcol(menu_row, menu_col) + else: + content.menu_position = None + + return content + + def mouse_handler(self, mouse_event: MouseEvent) -> "NotImplementedOrNone": + """ + Mouse handler for this control. + """ + buffer = self.buffer + position = mouse_event.position + + # Focus buffer when clicked. + if get_app().layout.current_control == self: + if self._last_get_processed_line: + processed_line = self._last_get_processed_line(position.y) + + # Translate coordinates back to the cursor position of the + # original input. + xpos = processed_line.display_to_source(position.x) + index = buffer.document.translate_row_col_to_index(position.y, xpos) + + # Set the cursor position. + if mouse_event.event_type == MouseEventType.MOUSE_DOWN: + buffer.exit_selection() + buffer.cursor_position = index + + elif ( + mouse_event.event_type == MouseEventType.MOUSE_MOVE + and mouse_event.button != MouseButton.NONE + ): + # Click and drag to highlight a selection + if ( + buffer.selection_state is None + and abs(buffer.cursor_position - index) > 0 + ): + buffer.start_selection(selection_type=SelectionType.CHARACTERS) + buffer.cursor_position = index + + elif mouse_event.event_type == MouseEventType.MOUSE_UP: + # When the cursor was moved to another place, select the text. + # (The >1 is actually a small but acceptable workaround for + # selecting text in Vi navigation mode. In navigation mode, + # the cursor can never be after the text, so the cursor + # will be repositioned automatically.) + if abs(buffer.cursor_position - index) > 1: + if buffer.selection_state is None: + buffer.start_selection( + selection_type=SelectionType.CHARACTERS + ) + buffer.cursor_position = index + + # Select word around cursor on double click. + # Two MOUSE_UP events in a short timespan are considered a double click. + double_click = ( + self._last_click_timestamp + and time.time() - self._last_click_timestamp < 0.3 + ) + self._last_click_timestamp = time.time() + + if double_click: + start, end = buffer.document.find_boundaries_of_current_word() + buffer.cursor_position += start + buffer.start_selection(selection_type=SelectionType.CHARACTERS) + buffer.cursor_position += end - start + else: + # Don't handle scroll events here. + return NotImplemented + + # Not focused, but focusing on click events. + else: + if ( + self.focus_on_click() + and mouse_event.event_type == MouseEventType.MOUSE_UP + ): + # Focus happens on mouseup. (If we did this on mousedown, the + # up event will be received at the point where this widget is + # focused and be handled anyway.) + get_app().layout.current_control = self + else: + return NotImplemented + + return None + + def move_cursor_down(self) -> None: + b = self.buffer + b.cursor_position += b.document.get_cursor_down_position() + + def move_cursor_up(self) -> None: + b = self.buffer + b.cursor_position += b.document.get_cursor_up_position() + + def get_key_bindings(self) -> Optional["KeyBindingsBase"]: + """ + When additional key bindings are given. Return these. + """ + return self.key_bindings + + def get_invalidate_events(self) -> Iterable["Event[object]"]: + """ + Return the Window invalidate events. + """ + # Whenever the buffer changes, the UI has to be updated. + yield self.buffer.on_text_changed + yield self.buffer.on_cursor_position_changed + + yield self.buffer.on_completions_changed + yield self.buffer.on_suggestion_set + + +class SearchBufferControl(BufferControl): + """ + :class:`.BufferControl` which is used for searching another + :class:`.BufferControl`. + + :param ignore_case: Search case insensitive. + """ + + def __init__( + self, + buffer: Optional[Buffer] = None, + input_processors: Optional[List[Processor]] = None, + lexer: Optional[Lexer] = None, + focus_on_click: FilterOrBool = False, + key_bindings: Optional["KeyBindingsBase"] = None, + ignore_case: FilterOrBool = False, + ): + + super().__init__( + buffer=buffer, + input_processors=input_processors, + lexer=lexer, + focus_on_click=focus_on_click, + key_bindings=key_bindings, + ) + + # If this BufferControl is used as a search field for one or more other + # BufferControls, then represents the search state. + self.searcher_search_state = SearchState(ignore_case=ignore_case) |