712 lines
27 KiB
Rust
712 lines
27 KiB
Rust
use crate::editable_text::{
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EditableTextState, InitStorage, TextInputLayoutData, TextLineSegment,
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actions::{DEFAULT_INPUT_CONTEXT, EditableTextActionElement, EditableTextActionHandler},
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};
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use gpui::{
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App, Bounds, CursorStyle, DispatchPhase, Display, Element, ElementId, ElementInputHandler,
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Entity, FocusHandle, Focusable, Hitbox, HitboxBehavior, Hsla, InteractiveElement,
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Interactivity, IntoElement, MouseButton, MouseDownEvent, MouseMoveEvent, MouseUpEvent,
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PaintQuad, Pixels, Point, SharedString, Size, StatefulInteractiveElement, Style,
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StyleRefinement, Styled, TextAlign, TextLayout, WeakEntity, Window, WrappedLine, fill, point,
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px, size,
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};
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use smallvec::SmallVec;
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use std::{cell::RefCell, ops::Range, rc::Rc, sync::Arc};
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#[track_caller]
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pub fn editable_text(id: impl Into<ElementId>) -> EditableTextElement {
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let mut this = EditableTextElement {
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interactivity: Interactivity::new(),
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state_entity: Rc::new(RefCell::new(WeakEntity::new_invalid())),
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supports_multiline: true,
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init_storage: InitStorage::default(),
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placeholder: None,
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accepts_input: true,
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};
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this.interactivity.element_id = Some(id.into());
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this = this.key_context(DEFAULT_INPUT_CONTEXT);
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this.register_actions();
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this
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}
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#[track_caller]
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pub fn text_input(id: impl Into<ElementId>) -> EditableTextElement {
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editable_text(id).multiline(false)
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}
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#[track_caller]
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pub fn text_area(id: impl Into<ElementId>) -> EditableTextElement {
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editable_text(id).multiline(true)
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}
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pub struct EditableTextElement {
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interactivity: Interactivity,
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// Populated on first render with an entity stored/attached to the view.
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// This reference is shared with the action handlers, which are processed between renders
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// and therefore cannot otherwise access state attached to the view.
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state_entity: Rc<RefCell<WeakEntity<EditableTextState>>>,
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init_storage: InitStorage,
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supports_multiline: bool,
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placeholder: Option<SharedString>,
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accepts_input: bool,
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}
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impl EditableTextElement {
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pub fn multiline(mut self, enabled: bool) -> Self {
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self.supports_multiline = enabled;
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self
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}
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pub fn placeholder(mut self, text: impl Into<SharedString>) -> Self {
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self.placeholder = Some(text.into());
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self
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}
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/// Swaps the default storage container (standard String) with a custom initializer of [`UnicodeTextStorage`].
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pub fn with_storage(mut self, fn_init: impl Into<InitStorage>) -> Self {
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self.init_storage = fn_init.into();
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self
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}
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/// Swaps the default storage container. The new initializer is a standard String using the provided value.
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///
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/// Incompatible with [`with_storage`] (they establish the same internal value).
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/// If you initialize custom storage, you should be able to initialize its default value.
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pub fn default_value(mut self, value: impl Into<String>) -> Self {
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let storage = super::StringStorage::from(value.into());
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self.init_storage = InitStorage::new_typed(move |_cx| storage.clone());
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self
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}
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/// Configures whether the element can accept input (effectively is the element currently enabled).
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pub fn accepts_input(mut self, enabled: bool) -> Self {
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self.accepts_input = enabled;
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self
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}
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}
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impl InteractiveElement for EditableTextElement {
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fn interactivity(&mut self) -> &mut Interactivity {
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&mut self.interactivity
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}
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}
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// forced implementation since the API for the element doesnt use Stateful<Element>
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impl StatefulInteractiveElement for EditableTextElement {}
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impl Styled for EditableTextElement {
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fn style(&mut self) -> &mut StyleRefinement {
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&mut self.interactivity.base_style
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}
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}
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impl IntoElement for EditableTextElement {
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type Element = Self;
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fn into_element(self) -> Self::Element {
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self
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}
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}
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impl EditableTextActionElement<EditableTextState> for EditableTextElement {
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fn state_entity_rc(&self) -> &Rc<RefCell<WeakEntity<EditableTextState>>> {
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&self.state_entity
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}
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}
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pub enum PrepaintElement {
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Line {
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line: Arc<WrappedLine>,
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point: Point<Pixels>,
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align: TextAlign,
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},
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Quad(PaintQuad),
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}
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impl PrepaintElement {
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fn build_quads(
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offset_corners: Vec<(Point<Pixels>, Point<Pixels>)>,
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origin: Point<Pixels>,
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color: Hsla,
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) -> impl Iterator<Item = Self> {
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let iter = offset_corners.into_iter();
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iter.map(move |(offset_start, offset_end)| {
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let bounds = Bounds::from_corners(origin + offset_start, origin + offset_end);
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PrepaintElement::Quad(fill(bounds, color))
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})
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}
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}
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#[doc(hidden)]
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pub struct LayoutState<State> {
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pub state: Entity<State>,
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}
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#[doc(hidden)]
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pub struct PrepaintState {
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pub hitbox: Option<Hitbox>,
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pub inner_bounds: Bounds<Pixels>,
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pub focus_handle: FocusHandle,
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pub elements: SmallVec<[PrepaintElement; 3]>,
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pub scroll_offset: Point<Pixels>,
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pub caret_visible: bool,
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}
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impl Element for EditableTextElement {
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type RequestLayoutState = LayoutState<EditableTextState>;
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type PrepaintState = PrepaintState;
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fn id(&self) -> Option<ElementId> {
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self.interactivity.element_id.clone()
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}
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fn source_location(&self) -> Option<&'static std::panic::Location<'static>> {
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self.interactivity.source_location()
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}
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fn request_layout(
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&mut self,
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global_id: Option<&gpui::GlobalElementId>,
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inspector_id: Option<&gpui::InspectorElementId>,
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window: &mut Window,
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cx: &mut App,
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) -> (gpui::LayoutId, Self::RequestLayoutState) {
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// Fetches or initializes the internal state of the field
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let state = match &self.interactivity().element_id {
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None => unimplemented!("all input elements must be assigned an id"),
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Some(element_id) => {
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let state = window.use_keyed_state(element_id.clone(), cx, |_window, cx| {
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EditableTextState::new(self.init_storage.exec(cx), cx)
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});
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// store a reference to the entity owned by the element for access in action handlers
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*self.state_entity_rc().borrow_mut() = state.downgrade();
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state
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}
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};
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let focus_handle;
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let show_placeholder;
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let storage_version;
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{
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let state = state.read(cx);
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focus_handle = state.focus_handle(cx);
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show_placeholder = state.storage().content_utf8().is_empty();
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storage_version = state.storage().version();
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}
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// TODO: This required a gpui api change in order to sync the focus handle between Interactivity and TextInputStateBase
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self.interactivity().track_focus(focus_handle);
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let placeholder = self.placeholder.clone();
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let placeholder_color = Hsla::white().opacity(0.5); // TODO: as an element param
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let supports_multiline = self.supports_multiline;
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let accepts_input = self.accepts_input;
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let layout_id = self.interactivity().request_layout(
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global_id,
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inspector_id,
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window,
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cx,
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|style, window, cx| {
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let state = state.clone();
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window.with_text_style(style.text_style().cloned(), |window| {
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// NOTE: Loosely mirrors TextLayout::layout
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let text_layout_id = window.request_measured_layout(Default::default(), {
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let text_style = window.text_style();
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let font_size = text_style.font_size.to_pixels(window.rem_size());
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let line_height = window.pixel_snap(
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text_style
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.line_height
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.to_pixels(font_size.into(), window.rem_size()),
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);
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move |known_dimensions, available_space, window, cx| {
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let text: SharedString;
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let color: Hsla;
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let prev_wrap_width: Option<Pixels>;
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let prev_size: Option<Size<Pixels>>;
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let last_seen_storage_version: u16;
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{
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let state = state.read(cx);
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match show_placeholder {
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false => {
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text = SharedString::from(state.storage().content_utf8());
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color = text_style.color;
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}
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true => {
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text = placeholder.clone().unwrap_or_default();
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color = placeholder_color;
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}
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}
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prev_wrap_width = state.layout_data.wrap_width;
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prev_size = state.layout_data.size;
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last_seen_storage_version =
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state.layout_data.last_seen_storage_version;
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}
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let runs = vec![gpui::TextRun {
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len: text.len(),
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font: text_style.font(),
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color,
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background_color: None,
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underline: None,
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strikethrough: None,
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}];
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let wrap_width = TextLayout::evaluate_wrap_width(
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&text_style.white_space,
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known_dimensions,
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available_space,
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);
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let truncation = TextLayout::evaluate_overflow(
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&text_style,
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known_dimensions,
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available_space,
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);
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if let Some(size) = prev_size
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&& (wrap_width.is_none() || wrap_width == prev_wrap_width)
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&& truncation.width.is_none()
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&& storage_version == last_seen_storage_version
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{
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return size;
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}
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let (text, runs) = TextLayout::apply_truncation(
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text,
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&text_style,
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font_size,
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wrap_width,
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&truncation,
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&runs,
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cx,
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);
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let text_len = text.len();
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let wrapped_lines = window
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.text_system()
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.shape_text(
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text,
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font_size,
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&runs,
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wrap_width,
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text_style.line_clamp,
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)
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.unwrap_or_default();
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// Build the size of the text and convert the wrapped_lines into
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// lines that will be cached in state and painted.
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let mut size: Size<Pixels> = Size::default();
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let mut pos_y = 0;
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let mut line_start = 0;
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let mut lines = Vec::with_capacity(wrapped_lines.len());
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for line in wrapped_lines {
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let line_size = line.size(line_height);
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size.height += line_size.height;
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size.width = size.width.max(line_size.width).ceil();
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let mut line_len = line.len();
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if line_len < text_len {
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// to offset for new-line characters that are
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// omitted from WrappedLine range
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line_len += 1;
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}
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let segment = TextLineSegment {
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text_range: line_start..line_start + line_len,
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wrapped_line: Some(Arc::new(line)),
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pos_y,
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};
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line_start += line_len;
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pos_y += segment.row_count();
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lines.push(segment);
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}
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let layout_data = TextInputLayoutData {
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supports_multiline,
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accepts_input,
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wrap_width,
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size: Some(size),
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last_seen_storage_version,
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lines,
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};
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// Update the state for use in prepaint, paint, and action handlers.
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// request_measured_layout caches this scope for processing later
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// between layout and prepaint, so we cant just copy/move these values to the outer scope.
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state.update(cx, move |state, _cx| {
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state.layout_data = layout_data;
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});
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size
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}
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});
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window.request_layout(style.clone(), Some(text_layout_id), cx)
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})
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},
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);
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let layout_state = LayoutState { state };
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(layout_id, layout_state)
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}
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fn prepaint(
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&mut self,
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global_id: Option<&gpui::GlobalElementId>,
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inspector_id: Option<&gpui::InspectorElementId>,
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bounds: Bounds<Pixels>,
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request_layout: &mut Self::RequestLayoutState,
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window: &mut Window,
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cx: &mut App,
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) -> Self::PrepaintState {
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// should reflect the text content layout size of the stored text,
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// so that scrolling can take it into account during prepaint.
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let content_size = {
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let state = request_layout.state.read(cx);
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state.layout_data.size.unwrap_or_else(|| bounds.size)
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};
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struct InteractivityPrepaint {
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hitbox: Option<Hitbox>,
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scroll_offset: Point<Pixels>,
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padding: gpui::Edges<Pixels>,
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}
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let prepaint = self.interactivity().prepaint(
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global_id,
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inspector_id,
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bounds,
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content_size,
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window,
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cx,
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|style, scroll_offset, hitbox, window, _cx| {
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let hitbox =
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hitbox.or_else(|| Some(window.insert_hitbox(bounds, HitboxBehavior::Normal)));
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let padding = style
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.padding
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.to_pixels(bounds.size.into(), window.rem_size());
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InteractivityPrepaint {
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hitbox,
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scroll_offset,
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padding,
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}
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},
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);
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let InteractivityPrepaint {
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hitbox,
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scroll_offset,
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padding,
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} = prepaint;
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let inner_bounds = {
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let mut bounds = bounds;
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bounds.origin += point(padding.left, padding.top);
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bounds.size.width -= padding.left + padding.right;
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bounds.size.height -= padding.top + padding.bottom;
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bounds
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};
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let selection_color = Hsla::blue().opacity(0.5); // TODO: as an element param
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let caret_color = Hsla::white(); // TODO: as an element param
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let state = request_layout.state.read(cx);
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let focus_handle = state.focus_handle(cx);
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let caret_pos = state.caret_pos();
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let selection = state.selected_range();
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let ime_range = state.marked_range();
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// TODO: Cursor blinking
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let cursor_visible = true; // input.cursor_visible();
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let mut elements = SmallVec::new();
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let line_height = window.line_height();
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let is_range_contained_by_range =
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|text_range: &Range<usize>, containing_range: &Range<usize>| {
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if text_range.is_empty() {
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containing_range.start <= text_range.start
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&& containing_range.end > text_range.start
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} else {
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containing_range.end > text_range.start
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&& containing_range.start < text_range.end
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}
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};
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let mut caret_point = None::<Point<Pixels>>;
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for segment in &state.layout_data.lines {
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let line_distance_from_top = segment.pos_y * line_height;
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let line_y = line_distance_from_top + scroll_offset.y;
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let line_bottom = line_y + line_height * segment.row_count() as f32;
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let line_visible = line_bottom >= Pixels::ZERO && line_y <= inner_bounds.size.height;
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if !line_visible {
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continue;
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}
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// TODO: First render all lines (underlines for IME), then all selections, then cursor if no selection
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if let Some(wrapped) = &segment.wrapped_line {
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let point = inner_bounds.origin + point(scroll_offset.x, line_y);
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elements.push(PrepaintElement::Line {
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line: wrapped.clone(),
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point,
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align: TextAlign::Left,
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});
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}
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let segment_is_empty = segment.text_range.is_empty();
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if is_range_contained_by_range(&segment.text_range, &selection) {
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if segment_is_empty {
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const EMPTY_LINE_SELECTION_WIDTH: Pixels = px(6.);
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elements.push(PrepaintElement::Quad(fill(
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Bounds::from_corners(
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inner_bounds.origin + point(Pixels::ZERO, line_y),
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inner_bounds.origin
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+ point(EMPTY_LINE_SELECTION_WIDTH, line_y + line_height),
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),
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selection_color,
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)));
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} else {
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let offset_corners = build_quad_over_text(
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&selection,
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segment,
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line_y,
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line_height,
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Pixels::ZERO,
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);
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elements.extend(PrepaintElement::build_quads(
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offset_corners,
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inner_bounds.origin,
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selection_color,
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));
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}
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}
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if !segment_is_empty && let Some(ime_range) = &ime_range {
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if !ime_range.is_empty()
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&& is_range_contained_by_range(&segment.text_range, &ime_range)
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{
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const MARKED_TEXT_UNDERLINE_THICKNESS: f32 = 2.0;
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let underline_thickness = px(MARKED_TEXT_UNDERLINE_THICKNESS);
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let underline_offset = line_height - underline_thickness;
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let offset_corners = build_quad_over_text(
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&ime_range,
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segment,
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line_y,
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line_height,
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underline_offset,
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);
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elements.extend(PrepaintElement::build_quads(
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offset_corners,
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inner_bounds.origin,
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selection_color,
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));
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}
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}
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let is_cursor_in_line = if segment_is_empty {
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caret_pos == segment.text_range.start
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} else {
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segment.text_range.contains(&caret_pos) || caret_pos == segment.text_range.end
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};
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if is_cursor_in_line && let Some(wrapped) = &segment.wrapped_line {
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// TODO: when the cursor is functionally at a character that is on the next line
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// (a line that spans multiple rows), the cursor displays at the end of the previous
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// row instead of the start of the next row.
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let local_offset = caret_pos.saturating_sub(segment.text_range.start);
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let caret_px = wrapped
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.position_for_index(local_offset, line_height)
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.unwrap_or_default();
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caret_point = Some(caret_px + point(scroll_offset.x, line_y));
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}
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}
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|
|
let is_focused = focus_handle.is_focused(window);
|
|
if is_focused
|
|
&& cursor_visible
|
|
&& let Some(carent_point) = caret_point
|
|
{
|
|
const CURSOR_WIDTH: f32 = 2.0;
|
|
let quad = fill(
|
|
Bounds::new(
|
|
inner_bounds.origin + carent_point,
|
|
size(gpui::px(CURSOR_WIDTH), line_height),
|
|
),
|
|
caret_color,
|
|
);
|
|
elements.push(PrepaintElement::Quad(quad));
|
|
}
|
|
|
|
PrepaintState {
|
|
hitbox,
|
|
inner_bounds,
|
|
focus_handle,
|
|
elements,
|
|
scroll_offset,
|
|
caret_visible: cursor_visible,
|
|
}
|
|
}
|
|
|
|
fn paint(
|
|
&mut self,
|
|
global_id: Option<&gpui::GlobalElementId>,
|
|
inspector_id: Option<&gpui::InspectorElementId>,
|
|
bounds: Bounds<Pixels>,
|
|
request_layout: &mut Self::RequestLayoutState,
|
|
prepaint: &mut Self::PrepaintState,
|
|
window: &mut Window,
|
|
cx: &mut App,
|
|
) {
|
|
if let Some(hitbox) = &prepaint.hitbox {
|
|
window.set_cursor_style(CursorStyle::IBeam, hitbox);
|
|
}
|
|
|
|
let accepts_input = self.accepts_input;
|
|
let inner_bounds = prepaint.inner_bounds;
|
|
let to_local_position = -(bounds.origin + prepaint.scroll_offset);
|
|
let perform_paint = |style: &Style, window: &mut Window, cx: &mut App| {
|
|
if style.display == Display::None {
|
|
return;
|
|
}
|
|
|
|
if accepts_input {
|
|
let ime_handler =
|
|
ElementInputHandler::new(inner_bounds, request_layout.state.clone());
|
|
window.handle_input(&prepaint.focus_handle, ime_handler, cx);
|
|
}
|
|
|
|
window.on_mouse_event({
|
|
let state = request_layout.state.clone();
|
|
move |event: &MouseDownEvent, phase, window, cx| {
|
|
if phase != DispatchPhase::Bubble {
|
|
return;
|
|
}
|
|
if !bounds.contains(&event.position) {
|
|
return;
|
|
}
|
|
if event.button != MouseButton::Left {
|
|
return;
|
|
}
|
|
|
|
let text_position = event.position + to_local_position;
|
|
state.update(cx, |state, cx| {
|
|
state.on_mouse_down(event, text_position, window, cx);
|
|
});
|
|
}
|
|
});
|
|
window.on_mouse_event({
|
|
let state = request_layout.state.clone();
|
|
move |event: &MouseUpEvent, phase, window, cx| {
|
|
if phase != DispatchPhase::Bubble {
|
|
return;
|
|
}
|
|
if event.button != MouseButton::Left {
|
|
return;
|
|
}
|
|
|
|
state.update(cx, |state, cx| {
|
|
state.on_mouse_up(event, window, cx);
|
|
});
|
|
}
|
|
});
|
|
window.on_mouse_event({
|
|
let state = request_layout.state.clone();
|
|
move |event: &MouseMoveEvent, phase, window, cx| {
|
|
if phase != DispatchPhase::Bubble {
|
|
return;
|
|
}
|
|
|
|
let text_position = event.position + to_local_position;
|
|
state.update(cx, |state, cx| {
|
|
state.on_mouse_move(event, text_position, window, cx);
|
|
});
|
|
}
|
|
});
|
|
|
|
let line_h = window.line_height();
|
|
let mut lines = Vec::with_capacity(prepaint.elements.len());
|
|
for element in prepaint.elements.drain(..) {
|
|
match element {
|
|
PrepaintElement::Line { line, point, align } => {
|
|
let _ = line.paint(point, line_h, align, Some(bounds), window, cx);
|
|
lines.push(line);
|
|
}
|
|
PrepaintElement::Quad(quad) => window.paint_quad(quad),
|
|
}
|
|
}
|
|
};
|
|
self.interactivity().paint(
|
|
global_id,
|
|
inspector_id,
|
|
bounds.clone(),
|
|
prepaint.hitbox.as_ref(),
|
|
window,
|
|
cx,
|
|
perform_paint,
|
|
);
|
|
}
|
|
}
|
|
|
|
fn build_quad_over_text(
|
|
containing_range: &Range<usize>,
|
|
segment: &TextLineSegment,
|
|
line_y: Pixels,
|
|
line_height: Pixels,
|
|
offset_y: Pixels,
|
|
) -> Vec<(Point<Pixels>, Point<Pixels>)> {
|
|
let Some(wrapped) = &segment.wrapped_line else {
|
|
return vec![];
|
|
};
|
|
|
|
let line_start = segment.text_range.start;
|
|
let line_end = segment.text_range.end;
|
|
|
|
let subrange_start = containing_range.start.max(line_start) - line_start;
|
|
let subrange_end = containing_range.end.min(line_end) - line_start;
|
|
|
|
let start_pos = wrapped
|
|
.position_for_index(subrange_start, line_height)
|
|
.unwrap_or_default();
|
|
let end_pos = wrapped
|
|
.position_for_index(subrange_end, line_height)
|
|
.unwrap_or_else(|| {
|
|
let last_line_y = line_height * (segment.row_count() - 1) as f32;
|
|
point(wrapped.width(), last_line_y)
|
|
});
|
|
|
|
let start_visual_line = (start_pos.y / line_height).floor() as usize;
|
|
let end_visual_line = (end_pos.y / line_height).floor() as usize;
|
|
|
|
if start_visual_line == end_visual_line {
|
|
vec![(
|
|
point(start_pos.x, line_y + start_pos.y + offset_y),
|
|
point(end_pos.x, line_y + start_pos.y + line_height),
|
|
)]
|
|
} else {
|
|
let line_width = wrapped.width();
|
|
let middle_lines = (start_visual_line + 1)..end_visual_line;
|
|
let mut quad_corners = Vec::with_capacity(middle_lines.end - middle_lines.start + 2);
|
|
|
|
quad_corners.push((
|
|
point(start_pos.x, line_y + start_pos.y + offset_y),
|
|
point(line_width, line_y + start_pos.y + line_height),
|
|
));
|
|
|
|
// Middle visual lines
|
|
for visual_line in (start_visual_line + 1)..end_visual_line {
|
|
let y = line_height * visual_line as f32;
|
|
quad_corners.push((
|
|
point(Pixels::ZERO, line_y + y + offset_y),
|
|
point(line_width, line_y + y + line_height),
|
|
));
|
|
}
|
|
|
|
// Last visual line
|
|
quad_corners.push((
|
|
point(Pixels::ZERO, line_y + end_pos.y + offset_y),
|
|
point(end_pos.x, line_y + end_pos.y + line_height),
|
|
));
|
|
|
|
quad_corners
|
|
}
|
|
}
|