796 lines
24 KiB
Rust
796 lines
24 KiB
Rust
//! A container for capturing mouse events.
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use std::time::Instant;
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use crate::tab::DOUBLE_CLICK_DURATION;
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use cosmic::iced::core::border::Border;
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use cosmic::iced::core::event::Event;
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use cosmic::iced::core::mouse::{self, click};
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use cosmic::iced::core::renderer::{self, Quad, Renderer as _};
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use cosmic::iced::core::widget::{Operation, Tree, tree};
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use cosmic::iced::core::{
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Clipboard, Color, Layout, Length, Point, Rectangle, Shell, Size, Vector, Widget, layout,
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overlay, touch,
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};
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use cosmic::widget::Id;
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use cosmic::{Element, Renderer, Theme};
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/// Emit messages on mouse events.
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#[allow(missing_debug_implementations)]
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pub struct MouseArea<'a, Message> {
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id: Id,
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content: Element<'a, Message>,
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on_auto_scroll: Option<Box<dyn OnAutoScroll<'a, Message>>>,
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on_drag: Option<Box<dyn OnDrag<'a, Message>>>,
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on_double_click: Option<Box<dyn OnMouseButton<'a, Message>>>,
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on_press: Option<Box<dyn OnMouseButton<'a, Message>>>,
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on_drag_end: Option<Box<dyn OnMouseButton<'a, Message>>>,
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on_release: Option<Box<dyn OnMouseButton<'a, Message>>>,
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on_resize: Option<Box<dyn OnResize<'a, Message>>>,
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on_right_press: Option<Box<dyn OnMouseButton<'a, Message>>>,
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on_right_press_no_capture: bool,
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on_right_press_window_position: bool,
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on_right_release: Option<Box<dyn OnMouseButton<'a, Message>>>,
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on_middle_press: Option<Box<dyn OnMouseButton<'a, Message>>>,
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on_middle_release: Option<Box<dyn OnMouseButton<'a, Message>>>,
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on_back_press: Option<Box<dyn OnMouseButton<'a, Message>>>,
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on_back_release: Option<Box<dyn OnMouseButton<'a, Message>>>,
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on_forward_press: Option<Box<dyn OnMouseButton<'a, Message>>>,
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on_forward_release: Option<Box<dyn OnMouseButton<'a, Message>>>,
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on_scroll: Option<Box<dyn OnScroll<'a, Message>>>,
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on_enter: Option<Box<dyn OnEnterExit<'a, Message>>>,
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on_exit: Option<Box<dyn OnEnterExit<'a, Message>>>,
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show_drag_rect: bool,
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}
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impl<'a, Message> MouseArea<'a, Message> {
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/// The message to emit when auto scroll changes.
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#[must_use]
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pub fn on_auto_scroll(mut self, message: impl OnAutoScroll<'a, Message>) -> Self {
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self.on_auto_scroll = Some(Box::new(message));
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self
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}
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/// The message to emit when a drag is initiated.
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#[must_use]
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pub fn on_drag(mut self, message: impl OnDrag<'a, Message>) -> Self {
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self.on_drag = Some(Box::new(message));
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self
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}
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/// The message to emit when a drag ends.
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#[must_use]
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pub fn on_drag_end(mut self, message: impl OnMouseButton<'a, Message>) -> Self {
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self.on_drag_end = Some(Box::new(message));
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self
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}
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/// The message to emit on a double click.
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#[must_use]
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pub fn on_double_click(mut self, message: impl OnMouseButton<'a, Message>) -> Self {
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self.on_double_click = Some(Box::new(message));
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self
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}
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/// The message to emit on a left button press.
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#[must_use]
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pub fn on_press(mut self, message: impl OnMouseButton<'a, Message>) -> Self {
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self.on_press = Some(Box::new(message));
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self
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}
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/// The message to emit on a left button release.
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#[must_use]
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pub fn on_release(mut self, message: impl OnMouseButton<'a, Message>) -> Self {
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self.on_release = Some(Box::new(message));
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self
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}
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/// The message to emit on resizing.
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#[must_use]
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pub fn on_resize(mut self, message: impl OnResize<'a, Message>) -> Self {
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self.on_resize = Some(Box::new(message));
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self
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}
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/// The message to emit on a right button press.
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#[must_use]
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pub fn on_right_press(mut self, message: impl OnMouseButton<'a, Message>) -> Self {
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self.on_right_press = Some(Box::new(message));
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self
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}
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/// on_right_press will not capture input
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#[must_use]
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pub fn on_right_press_no_capture(mut self) -> Self {
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self.on_right_press_no_capture = true;
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self
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}
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/// Only on wayland, on_right_press will provide window position instead of widget relative
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#[must_use]
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pub fn wayland_on_right_press_window_position(mut self) -> Self {
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#[cfg(feature = "wayland")]
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{
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self.on_right_press_window_position = true;
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}
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self
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}
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/// on_right_press will provide window position instead of widget relative
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#[must_use]
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pub fn on_right_press_window_position(mut self) -> Self {
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self.on_right_press_window_position = true;
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self
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}
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/// The message to emit on a right button release.
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#[must_use]
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pub fn on_right_release(mut self, message: impl OnMouseButton<'a, Message>) -> Self {
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self.on_right_release = Some(Box::new(message));
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self
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}
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/// The message to emit on a middle button press.
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#[must_use]
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pub fn on_middle_press(mut self, message: impl OnMouseButton<'a, Message>) -> Self {
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self.on_middle_press = Some(Box::new(message));
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self
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}
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/// The message to emit on a middle button release.
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#[must_use]
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pub fn on_middle_release(mut self, message: impl OnMouseButton<'a, Message>) -> Self {
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self.on_middle_release = Some(Box::new(message));
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self
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}
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/// The message to emit on a back button press.
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#[must_use]
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pub fn on_back_press(mut self, message: impl OnMouseButton<'a, Message>) -> Self {
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self.on_back_press = Some(Box::new(message));
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self
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}
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/// The message to emit on a back button release.
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#[must_use]
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pub fn on_back_release(mut self, message: impl OnMouseButton<'a, Message>) -> Self {
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self.on_back_release = Some(Box::new(message));
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self
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}
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/// The message to emit on a forward button press.
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#[must_use]
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pub fn on_forward_press(mut self, message: impl OnMouseButton<'a, Message>) -> Self {
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self.on_forward_press = Some(Box::new(message));
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self
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}
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/// The message to emit on a forward button release.
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#[must_use]
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pub fn on_forward_release(mut self, message: impl OnMouseButton<'a, Message>) -> Self {
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self.on_forward_release = Some(Box::new(message));
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self
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}
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/// The message to emit on a scroll.
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#[must_use]
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pub fn on_scroll(mut self, message: impl OnScroll<'a, Message>) -> Self {
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self.on_scroll = Some(Box::new(message));
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self
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}
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/// The message to emit when a mouse enters the area.
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#[must_use]
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pub fn on_enter(mut self, message: impl OnEnterExit<'a, Message>) -> Self {
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self.on_enter = Some(Box::new(message));
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self
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}
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/// The message to emit when a mouse exits the area.
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#[must_use]
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pub fn on_exit(mut self, message: impl OnEnterExit<'a, Message>) -> Self {
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self.on_exit = Some(Box::new(message));
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self
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}
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#[must_use]
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pub const fn show_drag_rect(mut self, show_drag_rect: bool) -> Self {
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self.show_drag_rect = show_drag_rect;
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self
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}
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/// Sets the widget's unique identifier.
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#[must_use]
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pub fn with_id(mut self, id: Id) -> Self {
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self.id = id;
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self
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}
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}
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pub trait OnAutoScroll<'a, Message>: Fn(Option<f32>) -> Message + 'a {}
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impl<'a, Message, F> OnAutoScroll<'a, Message> for F where F: Fn(Option<f32>) -> Message + 'a {}
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pub trait OnMouseButton<'a, Message>: Fn(Option<Point>) -> Message + 'a {}
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impl<'a, Message, F> OnMouseButton<'a, Message> for F where F: Fn(Option<Point>) -> Message + 'a {}
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pub trait OnDrag<'a, Message>: Fn(Option<Rectangle>) -> Message + 'a {}
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impl<'a, Message, F> OnDrag<'a, Message> for F where F: Fn(Option<Rectangle>) -> Message + 'a {}
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pub trait OnResize<'a, Message>: Fn(Rectangle) -> Message + 'a {}
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impl<'a, Message, F> OnResize<'a, Message> for F where F: Fn(Rectangle) -> Message + 'a {}
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pub trait OnScroll<'a, Message>: Fn(mouse::ScrollDelta) -> Option<Message> + 'a {}
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impl<'a, Message, F> OnScroll<'a, Message> for F where
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F: Fn(mouse::ScrollDelta) -> Option<Message> + 'a
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{
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}
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pub trait OnEnterExit<'a, Message>: Fn() -> Message + 'a {}
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impl<'a, Message, F> OnEnterExit<'a, Message> for F where F: Fn() -> Message + 'a {}
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/// Local state of the [`MouseArea`].
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#[derive(Default)]
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struct State {
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last_auto_scroll: Option<f32>,
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last_position: Option<Point>,
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last_virtual_position: Option<Point>,
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drag_initiated: Option<Point>,
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prev_click: Option<(mouse::Click, Instant)>,
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viewport: Option<Rectangle>,
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}
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impl State {
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fn drag_rect(&self, cursor: mouse::Cursor) -> Option<Rectangle> {
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if let Some(drag_source) = self.drag_initiated
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&& let Some(position) = cursor.position().or(self.last_virtual_position)
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&& position.distance(drag_source) > 1.0
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{
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let min_x = drag_source.x.min(position.x);
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let max_x = drag_source.x.max(position.x);
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let min_y = drag_source.y.min(position.y);
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let max_y = drag_source.y.max(position.y);
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return Some(Rectangle::new(
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Point::new(min_x, min_y),
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Size::new(max_x - min_x, max_y - min_y),
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));
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}
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None
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}
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fn click(&mut self, pos: Point) -> mouse::Click {
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let now = Instant::now();
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let new = if let Some((prev_click, prev_time)) = self.prev_click.take() {
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if now.duration_since(prev_time) < DOUBLE_CLICK_DURATION {
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match prev_click.kind() {
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mouse::click::Kind::Single => {
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mouse::Click::new(pos, mouse::Button::Left, Some(prev_click))
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}
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mouse::click::Kind::Double => {
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mouse::Click::new(pos, mouse::Button::Left, Some(prev_click))
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}
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mouse::click::Kind::Triple => {
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mouse::Click::new(pos, mouse::Button::Left, Some(prev_click))
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}
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}
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} else {
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mouse::Click::new(pos, mouse::Button::Left, None)
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}
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} else {
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mouse::Click::new(pos, mouse::Button::Left, None)
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};
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self.prev_click = Some((new, now));
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new
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}
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}
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impl<'a, Message> MouseArea<'a, Message> {
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/// Creates a [`MouseArea`] with the given content.
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pub fn new(content: impl Into<Element<'a, Message>>) -> Self {
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MouseArea {
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id: Id::unique(),
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content: content.into(),
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on_auto_scroll: None,
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on_drag: None,
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on_drag_end: None,
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on_double_click: None,
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on_press: None,
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on_release: None,
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on_resize: None,
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on_right_press: None,
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on_right_press_no_capture: false,
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on_right_press_window_position: false,
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on_right_release: None,
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on_middle_press: None,
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on_middle_release: None,
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on_back_press: None,
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on_back_release: None,
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on_forward_press: None,
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on_forward_release: None,
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on_enter: None,
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on_exit: None,
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on_scroll: None,
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show_drag_rect: false,
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}
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}
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}
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impl<Message> Widget<Message, Theme, Renderer> for MouseArea<'_, Message>
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where
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Message: Clone,
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{
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fn tag(&self) -> tree::Tag {
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tree::Tag::of::<State>()
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}
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fn state(&self) -> tree::State {
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tree::State::new(State::default())
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}
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fn children(&self) -> Vec<Tree> {
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vec![Tree::new(&self.content)]
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}
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fn diff(&mut self, tree: &mut Tree) {
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tree.diff_children(std::slice::from_mut(&mut self.content));
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}
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fn size(&self) -> Size<Length> {
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self.content.as_widget().size()
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}
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fn layout(
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&mut self,
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tree: &mut Tree,
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renderer: &Renderer,
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limits: &layout::Limits,
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) -> layout::Node {
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self.content
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.as_widget_mut()
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.layout(&mut tree.children[0], renderer, limits)
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}
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fn operate(
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&mut self,
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tree: &mut Tree,
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layout: Layout<'_>,
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renderer: &Renderer,
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operation: &mut dyn Operation,
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) {
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self.content
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.as_widget_mut()
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.operate(&mut tree.children[0], layout, renderer, operation);
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}
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fn update(
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&mut self,
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tree: &mut Tree,
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event: &Event,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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renderer: &Renderer,
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clipboard: &mut dyn Clipboard,
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shell: &mut Shell<'_, Message>,
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viewport: &Rectangle,
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) {
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self.content.as_widget_mut().update(
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&mut tree.children[0],
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event,
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layout,
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cursor,
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renderer,
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clipboard,
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shell,
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viewport,
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);
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if shell.is_event_captured() {
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return;
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}
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update(
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self,
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event,
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layout,
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cursor,
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shell,
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tree.state.downcast_mut::<State>(),
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viewport,
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);
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}
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fn mouse_interaction(
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&self,
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tree: &Tree,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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viewport: &Rectangle,
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renderer: &Renderer,
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) -> mouse::Interaction {
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self.content.as_widget().mouse_interaction(
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&tree.children[0],
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layout,
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cursor,
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viewport,
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renderer,
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)
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}
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fn draw(
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&self,
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tree: &Tree,
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renderer: &mut Renderer,
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theme: &Theme,
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renderer_style: &renderer::Style,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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viewport: &Rectangle,
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) {
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self.content.as_widget().draw(
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&tree.children[0],
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renderer,
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theme,
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renderer_style,
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layout,
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cursor,
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viewport,
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);
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if self.show_drag_rect {
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let state = tree.state.downcast_ref::<State>();
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if let Some(bounds) = state.drag_rect(cursor) {
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let cosmic = theme.cosmic();
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let mut bg_color = cosmic.accent_color();
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//TODO: get correct alpha
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bg_color.alpha = 0.2;
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renderer.start_layer(*viewport);
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renderer.fill_quad(
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Quad {
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bounds,
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border: Border {
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color: cosmic.accent_color().into(),
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width: 1.0,
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radius: cosmic.radius_xs().into(),
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},
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..Default::default()
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},
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Color::from(bg_color),
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);
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renderer.end_layer();
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}
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}
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}
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fn overlay<'b>(
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&'b mut self,
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tree: &'b mut Tree,
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layout: Layout<'b>,
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renderer: &Renderer,
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viewport: &Rectangle,
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translation: Vector,
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) -> Option<overlay::Element<'b, Message, Theme, Renderer>> {
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self.content.as_widget_mut().overlay(
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&mut tree.children[0],
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layout,
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renderer,
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viewport,
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translation,
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)
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}
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fn drag_destinations(
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&self,
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state: &Tree,
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layout: Layout<'_>,
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renderer: &Renderer,
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dnd_rectangles: &mut cosmic::iced::core::clipboard::DndDestinationRectangles,
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) {
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self.content.as_widget().drag_destinations(
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&state.children[0],
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layout,
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renderer,
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dnd_rectangles,
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);
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}
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fn id(&self) -> Option<Id> {
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Some(self.id.clone())
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}
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fn set_id(&mut self, id: Id) {
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self.id = id;
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}
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}
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impl<'a, Message> From<MouseArea<'a, Message>> for Element<'a, Message>
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where
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Message: 'a + Clone,
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Renderer: 'a + renderer::Renderer,
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Theme: 'a,
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{
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fn from(area: MouseArea<'a, Message>) -> Self {
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Element::new(area)
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}
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}
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/// Processes the given [`Event`] and updates the [`State`] of an [`MouseArea`]
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/// accordingly.
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fn update<Message: Clone>(
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widget: &mut MouseArea<'_, Message>,
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event: &Event,
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|
layout: Layout<'_>,
|
|
cursor: mouse::Cursor,
|
|
shell: &mut Shell<'_, Message>,
|
|
state: &mut State,
|
|
viewport: &Rectangle,
|
|
) {
|
|
let offset = layout.virtual_offset();
|
|
let layout_bounds = layout.bounds();
|
|
|
|
let viewport_changed = state.viewport != Some(*viewport);
|
|
|
|
if let Some(message) = widget.on_resize.as_ref()
|
|
&& viewport_changed
|
|
{
|
|
shell.publish(message(*viewport));
|
|
}
|
|
|
|
state.viewport = Some(*viewport);
|
|
|
|
let should_check_hover = viewport_changed
|
|
|| matches!(
|
|
event,
|
|
Event::Mouse(mouse::Event::CursorMoved { .. })
|
|
| Event::Mouse(mouse::Event::WheelScrolled { .. })
|
|
);
|
|
|
|
if should_check_hover {
|
|
let position_in = cursor.position_in(layout_bounds);
|
|
match (position_in, state.last_position) {
|
|
(None, Some(_)) => {
|
|
if let Some(message) = widget.on_exit.as_ref() {
|
|
shell.publish(message());
|
|
}
|
|
}
|
|
(Some(_), None) => {
|
|
if let Some(message) = widget.on_enter.as_ref() {
|
|
shell.publish(message());
|
|
}
|
|
}
|
|
_ => {}
|
|
}
|
|
state.last_position = position_in;
|
|
}
|
|
|
|
if let Event::Mouse(mouse::Event::CursorMoved { position }) = event {
|
|
let virtual_position = Point::new(
|
|
viewport.x - layout_bounds.x + position.x,
|
|
viewport.y - layout_bounds.y + position.y,
|
|
);
|
|
state.last_virtual_position = Some(virtual_position);
|
|
|
|
if let Some(message) = widget.on_auto_scroll.as_ref() {
|
|
let auto_scroll = if state.drag_initiated.is_some() {
|
|
let bottom = viewport.y;
|
|
let top = viewport.y + viewport.height;
|
|
if virtual_position.y < bottom {
|
|
Some(virtual_position.y - bottom)
|
|
} else if virtual_position.y > top {
|
|
Some(virtual_position.y - top)
|
|
} else {
|
|
None
|
|
}
|
|
} else {
|
|
None
|
|
};
|
|
if state.last_auto_scroll != auto_scroll {
|
|
shell.publish(message(auto_scroll));
|
|
state.last_auto_scroll = auto_scroll;
|
|
}
|
|
}
|
|
}
|
|
|
|
if state.drag_initiated.is_none() && !cursor.is_over(layout_bounds) {
|
|
return;
|
|
}
|
|
|
|
if let Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left))
|
|
| Event::Touch(touch::Event::FingerPressed { .. }) = event
|
|
{
|
|
let click = state.click(cursor.position_in(layout_bounds).unwrap_or_default());
|
|
match click.kind() {
|
|
click::Kind::Single => {
|
|
if let Some(message) = widget.on_press.as_ref() {
|
|
shell.publish(message(cursor.position_in(layout_bounds)));
|
|
}
|
|
}
|
|
click::Kind::Double => {
|
|
if let Some(message) = widget.on_double_click.as_ref() {
|
|
shell.publish(message(cursor.position_in(layout_bounds)));
|
|
}
|
|
}
|
|
click::Kind::Triple => {
|
|
// TODO what to do here
|
|
if let Some(message) = widget.on_press.as_ref() {
|
|
shell.publish(message(cursor.position_in(layout_bounds)));
|
|
}
|
|
}
|
|
}
|
|
if widget.on_drag.is_some() {
|
|
state.drag_initiated = cursor.position();
|
|
}
|
|
|
|
if widget.on_press.is_some() {
|
|
shell.capture_event();
|
|
return;
|
|
}
|
|
}
|
|
|
|
let distance_dragged = state
|
|
.drag_initiated
|
|
.map(|initiated| initiated.distance(cursor.position().unwrap_or_default()))
|
|
.unwrap_or_default();
|
|
if matches!(
|
|
event,
|
|
Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Left))
|
|
| Event::Touch(touch::Event::FingerLifted { .. })
|
|
) && distance_dragged > 1.0
|
|
{
|
|
state.drag_initiated = None;
|
|
state.prev_click = None;
|
|
if let Some(message) = widget.on_drag_end.as_ref() {
|
|
shell.publish(message(cursor.position_in(layout_bounds)));
|
|
}
|
|
}
|
|
|
|
let recent_click = state
|
|
.prev_click
|
|
.as_ref()
|
|
.is_some_and(|(_, i)| Instant::now().duration_since(*i) <= DOUBLE_CLICK_DURATION);
|
|
if matches!(
|
|
event,
|
|
Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Left))
|
|
| Event::Touch(touch::Event::FingerLifted { .. })
|
|
) && state.prev_click.is_some()
|
|
{
|
|
if !recent_click {
|
|
state.prev_click = None;
|
|
return;
|
|
}
|
|
state.drag_initiated = None;
|
|
if let Some(message) = widget.on_release.as_ref() {
|
|
shell.publish(message(cursor.position_in(layout_bounds)));
|
|
|
|
shell.capture_event();
|
|
return;
|
|
}
|
|
}
|
|
|
|
if let Some(message) = widget.on_right_press.as_ref()
|
|
&& matches!(
|
|
event,
|
|
Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Right))
|
|
)
|
|
{
|
|
let point_opt = if widget.on_right_press_window_position {
|
|
cursor.position_over(layout_bounds).map(|mut p| {
|
|
p.x -= offset.x;
|
|
p.y -= offset.y;
|
|
p
|
|
})
|
|
} else {
|
|
cursor.position_in(layout_bounds)
|
|
};
|
|
shell.publish(message(point_opt));
|
|
|
|
if widget.on_right_press_no_capture {
|
|
return;
|
|
}
|
|
shell.capture_event();
|
|
return;
|
|
}
|
|
|
|
if let Some(message) = widget.on_right_release.as_ref()
|
|
&& matches!(
|
|
event,
|
|
Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Right))
|
|
)
|
|
{
|
|
shell.publish(message(cursor.position_in(layout_bounds)));
|
|
|
|
shell.capture_event();
|
|
return;
|
|
}
|
|
|
|
if let Some(message) = widget.on_middle_press.as_ref()
|
|
&& matches!(
|
|
event,
|
|
Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Middle))
|
|
)
|
|
{
|
|
shell.publish(message(cursor.position_in(layout_bounds)));
|
|
|
|
shell.capture_event();
|
|
return;
|
|
}
|
|
|
|
if let Some(message) = widget.on_middle_release.as_ref()
|
|
&& matches!(
|
|
event,
|
|
Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Middle))
|
|
)
|
|
{
|
|
shell.publish(message(cursor.position_in(layout_bounds)));
|
|
|
|
shell.capture_event();
|
|
return;
|
|
}
|
|
|
|
if let Some(message) = widget.on_back_press.as_ref()
|
|
&& matches!(
|
|
event,
|
|
Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Back))
|
|
)
|
|
{
|
|
shell.publish(message(cursor.position_in(layout_bounds)));
|
|
|
|
shell.capture_event();
|
|
return;
|
|
}
|
|
|
|
if let Some(message) = widget.on_back_release.as_ref()
|
|
&& matches!(
|
|
event,
|
|
Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Back))
|
|
)
|
|
{
|
|
shell.publish(message(cursor.position_in(layout_bounds)));
|
|
|
|
shell.capture_event();
|
|
return;
|
|
}
|
|
|
|
if let Some(message) = widget.on_forward_press.as_ref()
|
|
&& matches!(
|
|
event,
|
|
Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Forward))
|
|
)
|
|
{
|
|
shell.publish(message(cursor.position_in(layout_bounds)));
|
|
|
|
shell.capture_event();
|
|
return;
|
|
}
|
|
|
|
if let Some(message) = widget.on_forward_release.as_ref()
|
|
&& matches!(
|
|
event,
|
|
Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Forward))
|
|
)
|
|
{
|
|
shell.publish(message(cursor.position_in(layout_bounds)));
|
|
|
|
shell.capture_event();
|
|
return;
|
|
}
|
|
|
|
if let Some(on_scroll) = widget.on_scroll.as_ref()
|
|
&& let Event::Mouse(mouse::Event::WheelScrolled { delta }) = event
|
|
&& let Some(message) = on_scroll(*delta)
|
|
{
|
|
shell.publish(message);
|
|
shell.capture_event();
|
|
return;
|
|
}
|
|
|
|
if let Some((message, drag_rect)) = widget.on_drag.as_ref().zip(state.drag_rect(cursor)) {
|
|
shell.publish(message(drag_rect.intersection(&layout_bounds).map(
|
|
|mut rect| {
|
|
rect.x -= layout_bounds.x;
|
|
rect.y -= layout_bounds.y;
|
|
rect
|
|
},
|
|
)));
|
|
}
|
|
}
|