Inline helper functions in widget modules
This commit is contained in:
Héctor Ramón Jiménez
parent
7161cb40c7
commit
288025f514
4 changed files with 553 additions and 669 deletions
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@ -16,6 +16,7 @@ use crate::core::{
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use crate::overlay::menu::{self, Menu};
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use std::borrow::Borrow;
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use std::f32;
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/// A widget for selecting a single value from a list of options.
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#[allow(missing_debug_implementations)]
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@ -186,19 +187,77 @@ where
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renderer: &Renderer,
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limits: &layout::Limits,
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) -> layout::Node {
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layout(
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tree.state.downcast_mut::<State<Renderer::Paragraph>>(),
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renderer,
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limits,
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self.width,
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self.padding,
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self.text_size,
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self.text_line_height,
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self.text_shaping,
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self.font,
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self.placeholder.as_deref(),
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self.options.borrow(),
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)
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let state = tree.state.downcast_mut::<State<Renderer::Paragraph>>();
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let font = self.font.unwrap_or_else(|| renderer.default_font());
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let text_size =
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self.text_size.unwrap_or_else(|| renderer.default_size());
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let options = self.options.borrow();
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state.options.resize_with(options.len(), Default::default);
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let option_text = Text {
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content: "",
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bounds: Size::new(
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f32::INFINITY,
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self.text_line_height.to_absolute(text_size).into(),
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),
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size: text_size,
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line_height: self.text_line_height,
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font,
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horizontal_alignment: alignment::Horizontal::Left,
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vertical_alignment: alignment::Vertical::Center,
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shaping: self.text_shaping,
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};
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for (option, paragraph) in options.iter().zip(state.options.iter_mut())
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{
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let label = option.to_string();
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paragraph.update(Text {
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content: &label,
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..option_text
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});
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}
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if let Some(placeholder) = &self.placeholder {
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state.placeholder.update(Text {
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content: placeholder,
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..option_text
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});
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}
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let max_width = match self.width {
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Length::Shrink => {
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let labels_width =
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state.options.iter().fold(0.0, |width, paragraph| {
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f32::max(width, paragraph.min_width())
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});
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labels_width.max(
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self.placeholder
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.as_ref()
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.map(|_| state.placeholder.min_width())
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.unwrap_or(0.0),
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)
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}
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_ => 0.0,
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};
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let size = {
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let intrinsic = Size::new(
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max_width + text_size.0 + self.padding.left,
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f32::from(self.text_line_height.to_absolute(text_size)),
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);
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limits
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.width(self.width)
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.shrink(self.padding)
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.resolve(self.width, Length::Shrink, intrinsic)
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.expand(self.padding)
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};
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layout::Node::new(size)
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}
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fn on_event(
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@ -212,18 +271,98 @@ where
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shell: &mut Shell<'_, Message>,
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_viewport: &Rectangle,
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) -> event::Status {
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update(
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event,
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layout,
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cursor,
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shell,
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self.on_select.as_ref(),
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self.on_open.as_ref(),
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self.on_close.as_ref(),
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self.selected.as_ref().map(Borrow::borrow),
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self.options.borrow(),
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|| tree.state.downcast_mut::<State<Renderer::Paragraph>>(),
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)
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match event {
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Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left))
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| Event::Touch(touch::Event::FingerPressed { .. }) => {
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let state =
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tree.state.downcast_mut::<State<Renderer::Paragraph>>();
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if state.is_open {
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// Event wasn't processed by overlay, so cursor was clicked either outside its
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// bounds or on the drop-down, either way we close the overlay.
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state.is_open = false;
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if let Some(on_close) = &self.on_close {
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shell.publish(on_close.clone());
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}
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event::Status::Captured
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} else if cursor.is_over(layout.bounds()) {
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let selected = self.selected.as_ref().map(Borrow::borrow);
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state.is_open = true;
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state.hovered_option = self
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.options
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.borrow()
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.iter()
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.position(|option| Some(option) == selected);
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if let Some(on_open) = &self.on_open {
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shell.publish(on_open.clone());
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}
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event::Status::Captured
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} else {
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event::Status::Ignored
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}
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}
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Event::Mouse(mouse::Event::WheelScrolled {
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delta: mouse::ScrollDelta::Lines { y, .. },
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}) => {
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let state =
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tree.state.downcast_mut::<State<Renderer::Paragraph>>();
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if state.keyboard_modifiers.command()
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&& cursor.is_over(layout.bounds())
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&& !state.is_open
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{
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fn find_next<'a, T: PartialEq>(
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selected: &'a T,
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mut options: impl Iterator<Item = &'a T>,
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) -> Option<&'a T> {
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let _ = options.find(|&option| option == selected);
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options.next()
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}
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let options = self.options.borrow();
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let selected = self.selected.as_ref().map(Borrow::borrow);
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let next_option = if y < 0.0 {
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if let Some(selected) = selected {
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find_next(selected, options.iter())
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} else {
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options.first()
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}
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} else if y > 0.0 {
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if let Some(selected) = selected {
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find_next(selected, options.iter().rev())
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} else {
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options.last()
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}
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} else {
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None
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};
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if let Some(next_option) = next_option {
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shell.publish((self.on_select)(next_option.clone()));
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}
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event::Status::Captured
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} else {
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event::Status::Ignored
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}
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}
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Event::Keyboard(keyboard::Event::ModifiersChanged(modifiers)) => {
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let state =
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tree.state.downcast_mut::<State<Renderer::Paragraph>>();
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state.keyboard_modifiers = modifiers;
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event::Status::Ignored
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}
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_ => event::Status::Ignored,
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}
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}
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fn mouse_interaction(
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@ -234,7 +373,14 @@ where
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_viewport: &Rectangle,
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_renderer: &Renderer,
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) -> mouse::Interaction {
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mouse_interaction(layout, cursor)
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let bounds = layout.bounds();
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let is_mouse_over = cursor.is_over(bounds);
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if is_mouse_over {
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mouse::Interaction::Pointer
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} else {
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mouse::Interaction::default()
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}
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}
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fn draw(
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@ -429,9 +575,8 @@ where
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}
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}
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/// The state of a [`PickList`].
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#[derive(Debug)]
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pub struct State<P: text::Paragraph> {
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struct State<P: text::Paragraph> {
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menu: menu::State,
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keyboard_modifiers: keyboard::Modifiers,
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is_open: bool,
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@ -504,210 +649,6 @@ pub struct Icon<Font> {
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pub shaping: text::Shaping,
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}
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/// Computes the layout of a [`PickList`].
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pub fn layout<Renderer, T>(
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state: &mut State<Renderer::Paragraph>,
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renderer: &Renderer,
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limits: &layout::Limits,
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width: Length,
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padding: Padding,
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text_size: Option<Pixels>,
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text_line_height: text::LineHeight,
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text_shaping: text::Shaping,
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font: Option<Renderer::Font>,
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placeholder: Option<&str>,
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options: &[T],
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) -> layout::Node
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where
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Renderer: text::Renderer,
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T: ToString,
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{
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use std::f32;
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let font = font.unwrap_or_else(|| renderer.default_font());
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let text_size = text_size.unwrap_or_else(|| renderer.default_size());
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state.options.resize_with(options.len(), Default::default);
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let option_text = Text {
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content: "",
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bounds: Size::new(
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f32::INFINITY,
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text_line_height.to_absolute(text_size).into(),
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),
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size: text_size,
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line_height: text_line_height,
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font,
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horizontal_alignment: alignment::Horizontal::Left,
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vertical_alignment: alignment::Vertical::Center,
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shaping: text_shaping,
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};
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for (option, paragraph) in options.iter().zip(state.options.iter_mut()) {
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let label = option.to_string();
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paragraph.update(Text {
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content: &label,
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..option_text
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});
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}
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if let Some(placeholder) = placeholder {
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state.placeholder.update(Text {
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content: placeholder,
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..option_text
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});
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}
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let max_width = match width {
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Length::Shrink => {
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let labels_width =
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state.options.iter().fold(0.0, |width, paragraph| {
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f32::max(width, paragraph.min_width())
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});
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labels_width.max(
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placeholder
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.map(|_| state.placeholder.min_width())
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.unwrap_or(0.0),
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)
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}
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_ => 0.0,
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};
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let size = {
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let intrinsic = Size::new(
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max_width + text_size.0 + padding.left,
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f32::from(text_line_height.to_absolute(text_size)),
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);
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limits
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.width(width)
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.shrink(padding)
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.resolve(width, Length::Shrink, intrinsic)
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.expand(padding)
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};
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layout::Node::new(size)
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}
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/// Processes an [`Event`] and updates the [`State`] of a [`PickList`]
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/// accordingly.
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pub fn update<'a, T, P, Message>(
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event: Event,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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shell: &mut Shell<'_, Message>,
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on_select: &dyn Fn(T) -> Message,
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on_open: Option<&Message>,
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on_close: Option<&Message>,
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selected: Option<&T>,
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options: &[T],
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state: impl FnOnce() -> &'a mut State<P>,
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) -> event::Status
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where
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T: PartialEq + Clone + 'a,
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P: text::Paragraph + 'a,
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Message: Clone,
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{
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match event {
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Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left))
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| Event::Touch(touch::Event::FingerPressed { .. }) => {
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let state = state();
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if state.is_open {
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// Event wasn't processed by overlay, so cursor was clicked either outside it's
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// bounds or on the drop-down, either way we close the overlay.
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state.is_open = false;
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if let Some(on_close) = on_close {
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shell.publish(on_close.clone());
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}
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event::Status::Captured
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} else if cursor.is_over(layout.bounds()) {
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state.is_open = true;
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state.hovered_option =
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options.iter().position(|option| Some(option) == selected);
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if let Some(on_open) = on_open {
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shell.publish(on_open.clone());
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}
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event::Status::Captured
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} else {
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event::Status::Ignored
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}
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}
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Event::Mouse(mouse::Event::WheelScrolled {
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delta: mouse::ScrollDelta::Lines { y, .. },
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}) => {
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let state = state();
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if state.keyboard_modifiers.command()
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&& cursor.is_over(layout.bounds())
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&& !state.is_open
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{
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fn find_next<'a, T: PartialEq>(
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selected: &'a T,
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mut options: impl Iterator<Item = &'a T>,
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) -> Option<&'a T> {
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let _ = options.find(|&option| option == selected);
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options.next()
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}
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let next_option = if y < 0.0 {
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if let Some(selected) = selected {
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find_next(selected, options.iter())
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} else {
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options.first()
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}
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} else if y > 0.0 {
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if let Some(selected) = selected {
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find_next(selected, options.iter().rev())
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} else {
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options.last()
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}
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} else {
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None
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};
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if let Some(next_option) = next_option {
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shell.publish((on_select)(next_option.clone()));
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}
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event::Status::Captured
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} else {
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event::Status::Ignored
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}
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}
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Event::Keyboard(keyboard::Event::ModifiersChanged(modifiers)) => {
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let state = state();
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state.keyboard_modifiers = modifiers;
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event::Status::Ignored
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}
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_ => event::Status::Ignored,
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}
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}
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/// Returns the current [`mouse::Interaction`] of a [`PickList`].
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pub fn mouse_interaction(
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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) -> mouse::Interaction {
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let bounds = layout.bounds();
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let is_mouse_over = cursor.is_over(bounds);
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if is_mouse_over {
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mouse::Interaction::Pointer
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} else {
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mouse::Interaction::default()
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}
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}
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/// The possible status of a [`PickList`].
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum Status {
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