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|
//! A [`Selectable`] widget that wraps some elements (preferrably all your apps elements) and makes
//! all its children instances of [`Text`] and [`Rich`] became globally selectable instead of
//! independently selectable. This widget also handles the copy shortcut ('ctrl + c') by checking
//! for all selections contained inside it and writing to the [`Standard`] clipboard when there is
//! some selection.
//!
//! WARNING: You should only have one [`Selectable`] on your app, preferrably as the root of your
//! app to make sure that any [`Text`] or [`Rich`] is inside it. Having multiple selectables or a
//! selectable along side some [`Text`] or [`Rich`] is undefined behavior and even though the
//! selection might look ok for you the copied text will probably not be what you expect.
//!
//! [`Text`]: crate::Text
//! [`Rich`]: crate::text::Rich
//! [`Standard`]: crate::core::clipboard::Kind::Standard
use crate::core::{
self, Element, Event, Length, Rectangle, Shell, Size, Vector, Widget,
clipboard::{self, Clipboard},
keyboard,
layout::{Layout, Limits, Node},
mouse, overlay,
renderer::Style,
widget::{Tree, operation::Operation, tree},
};
/// A [`Selectable`] widget that wraps some elements (preferrably all your apps elements) and makes
/// all its children instances of [`Text`] and [`Rich`] became globally selectable instead of
/// independently selectable. This widget also handles the copy shortcut ('ctrl + c') by checking
/// for all selections contained inside it and writing to the [`Standard`] clipboard when there is
/// some selection.
///
/// WARNING: You should only have one [`Selectable`] on your app, preferrably as the root of your
/// app to make sure that any [`Text`] or [`Rich`] is inside it. Having multiple selectables or a
/// selectable along side some [`Text`] or [`Rich`] is undefined behavior and even though the
/// selection might look ok for you the copied text will probably not be what you expect.
///
/// [`Text`]: crate::Text
/// [`Rich`]: crate::text::Rich
/// [`Standard`]: crate::core::clipboard::Kind::Standard
pub struct Selectable<'a, Message, Theme, Renderer> {
content: Element<'a, Message, Theme, Renderer>,
}
impl<'a, Message, Theme, Renderer> Selectable<'a, Message, Theme, Renderer> {
/// Creates a new [`Selectable`] with the given content.
pub fn new(
content: impl Into<Element<'a, Message, Theme, Renderer>>,
) -> Self {
Self {
content: content.into(),
}
}
}
/// The internal state of a [`Selectable`] widget.
#[derive(Debug, Default, Clone)]
struct State {
keyboard_modifiers: keyboard::Modifiers,
}
impl<'a, Message, Theme, Renderer> Widget<Message, Theme, Renderer>
for Selectable<'a, Message, Theme, Renderer>
where
Renderer: core::Renderer,
{
fn tag(&self) -> tree::Tag {
tree::Tag::of::<State>()
}
fn state(&self) -> tree::State {
tree::State::new(State::default())
}
fn children(&self) -> Vec<Tree> {
vec![Tree::new(&self.content)]
}
fn diff(&self, tree: &mut Tree) {
tree.diff_children(std::slice::from_ref(&self.content));
}
fn size(&self) -> Size<Length> {
self.content.as_widget().size()
}
fn layout(
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &Limits,
) -> Node {
let layout = self.content.as_widget_mut().layout(
&mut tree.children[0],
renderer,
limits,
);
self.content.as_widget_mut().operate(
&mut tree.children[0],
Layout::new(&layout),
renderer,
&mut crate::operation::global_selection(),
);
layout
}
fn operate(
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
operation: &mut dyn Operation,
) {
operation.traverse(&mut |operation| {
self.content.as_widget_mut().operate(
&mut tree.children[0],
layout,
renderer,
operation,
);
});
}
fn update(
&mut self,
tree: &mut Tree,
event: &Event,
layout: Layout<'_>,
cursor: mouse::Cursor,
renderer: &Renderer,
clipboard: &mut dyn Clipboard,
shell: &mut Shell<'_, Message>,
viewport: &Rectangle,
) {
self.content.as_widget_mut().update(
&mut tree.children[0],
event,
layout,
cursor,
renderer,
clipboard,
shell,
viewport,
);
if shell.is_event_captured() {
return;
}
let state = tree.state.downcast_mut::<State>();
if let Event::Keyboard(keyboard::Event::KeyPressed { key, .. }) = event
&& let keyboard::Key::Character("c") = key.as_ref()
&& state.keyboard_modifiers.command()
{
let mut selected = crate::operation::selected();
selected.traverse(&mut |operation| {
self.content.as_widget_mut().operate(
&mut tree.children[0],
layout,
renderer,
&mut core::widget::operation::black_box(operation),
);
});
if let core::widget::operation::Outcome::Some(selection) =
selected.finish()
{
clipboard.write(clipboard::Kind::Standard, selection);
shell.capture_event();
}
} else if let Event::Keyboard(keyboard::Event::ModifiersChanged(
modifiers,
)) = event
{
state.keyboard_modifiers = *modifiers;
}
}
fn mouse_interaction(
&self,
tree: &Tree,
layout: Layout<'_>,
cursor: mouse::Cursor,
viewport: &Rectangle,
renderer: &Renderer,
) -> mouse::Interaction {
self.content.as_widget().mouse_interaction(
&tree.children[0],
layout,
cursor,
viewport,
renderer,
)
}
fn draw(
&self,
tree: &Tree,
renderer: &mut Renderer,
theme: &Theme,
style: &Style,
layout: Layout<'_>,
cursor: mouse::Cursor,
viewport: &Rectangle,
) {
self.content.as_widget().draw(
&tree.children[0],
renderer,
theme,
style,
layout,
cursor,
viewport,
);
}
fn overlay<'b>(
&'b mut self,
state: &'b mut Tree,
layout: Layout<'b>,
renderer: &Renderer,
viewport: &Rectangle,
translation: Vector,
) -> Option<overlay::Element<'b, Message, Theme, Renderer>> {
self.content.as_widget_mut().overlay(
&mut state.children[0],
layout,
renderer,
viewport,
translation,
)
}
}
impl<'a, Message, Theme, Renderer>
From<Selectable<'a, Message, Theme, Renderer>>
for Element<'a, Message, Theme, Renderer>
where
Message: 'a,
Theme: 'a,
Renderer: core::Renderer + 'a,
{
fn from(
selectable: Selectable<'a, Message, Theme, Renderer>,
) -> Element<'a, Message, Theme, Renderer> {
Element::new(selectable)
}
}
|
