136 lines
3.8 KiB
Rust
136 lines
3.8 KiB
Rust
//! Operate on widgets that have text input.
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use crate::widget::operation::Operation;
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use crate::widget::Id;
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use crate::Rectangle;
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/// The internal state of a widget that has text input.
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pub trait TextInput {
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/// Moves the cursor of the text input to the front of the input text.
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fn move_cursor_to_front(&mut self);
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/// Moves the cursor of the text input to the end of the input text.
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fn move_cursor_to_end(&mut self);
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/// Moves the cursor of the text input to an arbitrary location.
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fn move_cursor_to(&mut self, position: usize);
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/// Selects all the content of the text input.
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fn select_all(&mut self);
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}
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/// Produces an [`Operation`] that moves the cursor of the widget with the given [`Id`] to the
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/// front.
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pub fn move_cursor_to_front<T>(target: Id) -> impl Operation<T> {
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struct MoveCursor {
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target: Id,
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}
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impl<T> Operation<T> for MoveCursor {
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fn text_input(&mut self, state: &mut dyn TextInput, id: Option<&Id>) {
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match id {
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Some(id) if id == &self.target => {
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state.move_cursor_to_front();
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}
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_ => {}
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}
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}
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fn container(
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&mut self,
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_id: Option<&Id>,
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_bounds: Rectangle,
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operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
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) {
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operate_on_children(self);
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}
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}
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MoveCursor { target }
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}
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/// Produces an [`Operation`] that moves the cursor of the widget with the given [`Id`] to the
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/// end.
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pub fn move_cursor_to_end<T>(target: Id) -> impl Operation<T> {
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struct MoveCursor {
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target: Id,
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}
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impl<T> Operation<T> for MoveCursor {
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fn text_input(&mut self, state: &mut dyn TextInput, id: Option<&Id>) {
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match id {
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Some(id) if id == &self.target => {
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state.move_cursor_to_end();
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}
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_ => {}
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}
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}
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fn container(
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&mut self,
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_id: Option<&Id>,
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_bounds: Rectangle,
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operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
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) {
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operate_on_children(self);
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}
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}
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MoveCursor { target }
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}
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/// Produces an [`Operation`] that moves the cursor of the widget with the given [`Id`] to the
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/// provided position.
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pub fn move_cursor_to<T>(target: Id, position: usize) -> impl Operation<T> {
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struct MoveCursor {
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target: Id,
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position: usize,
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}
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impl<T> Operation<T> for MoveCursor {
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fn text_input(&mut self, state: &mut dyn TextInput, id: Option<&Id>) {
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match id {
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Some(id) if id == &self.target => {
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state.move_cursor_to(self.position);
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}
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_ => {}
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}
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}
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fn container(
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&mut self,
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_id: Option<&Id>,
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_bounds: Rectangle,
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operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
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) {
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operate_on_children(self);
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}
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}
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MoveCursor { target, position }
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}
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/// Produces an [`Operation`] that selects all the content of the widget with the given [`Id`].
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pub fn select_all<T>(target: Id) -> impl Operation<T> {
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struct MoveCursor {
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target: Id,
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}
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impl<T> Operation<T> for MoveCursor {
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fn text_input(&mut self, state: &mut dyn TextInput, id: Option<&Id>) {
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match id {
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Some(id) if id == &self.target => {
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state.select_all();
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}
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_ => {}
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}
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}
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fn container(
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&mut self,
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_id: Option<&Id>,
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_bounds: Rectangle,
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operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
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) {
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operate_on_children(self);
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}
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}
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MoveCursor { target }
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}
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