304 lines
8.7 KiB
Rust
304 lines
8.7 KiB
Rust
use crate::event::{self, Event};
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use crate::layout;
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use crate::mouse;
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use crate::overlay;
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use crate::renderer;
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use crate::widget::container;
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use crate::{
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Clipboard, Element, Layout, Padding, Point, Rectangle, Shell, Size,
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};
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/// The title bar of a [`Pane`].
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///
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/// [`Pane`]: crate::widget::pane_grid::Pane
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#[allow(missing_debug_implementations)]
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pub struct TitleBar<'a, Message, Renderer> {
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content: Element<'a, Message, Renderer>,
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controls: Option<Element<'a, Message, Renderer>>,
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padding: Padding,
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always_show_controls: bool,
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style_sheet: Box<dyn container::StyleSheet + 'a>,
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}
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impl<'a, Message, Renderer> TitleBar<'a, Message, Renderer>
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where
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Renderer: crate::Renderer,
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{
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/// Creates a new [`TitleBar`] with the given content.
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pub fn new<E>(content: E) -> Self
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where
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E: Into<Element<'a, Message, Renderer>>,
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{
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Self {
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content: content.into(),
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controls: None,
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padding: Padding::ZERO,
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always_show_controls: false,
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style_sheet: Default::default(),
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}
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}
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/// Sets the controls of the [`TitleBar`].
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pub fn controls(
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mut self,
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controls: impl Into<Element<'a, Message, Renderer>>,
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) -> Self {
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self.controls = Some(controls.into());
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self
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}
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/// Sets the [`Padding`] of the [`TitleBar`].
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pub fn padding<P: Into<Padding>>(mut self, padding: P) -> Self {
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self.padding = padding.into();
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self
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}
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/// Sets the style of the [`TitleBar`].
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pub fn style(
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mut self,
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style: impl Into<Box<dyn container::StyleSheet + 'a>>,
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) -> Self {
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self.style_sheet = style.into();
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self
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}
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/// Sets whether or not the [`controls`] attached to this [`TitleBar`] are
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/// always visible.
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///
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/// By default, the controls are only visible when the [`Pane`] of this
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/// [`TitleBar`] is hovered.
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///
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/// [`controls`]: Self::controls
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/// [`Pane`]: crate::widget::pane_grid::Pane
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pub fn always_show_controls(mut self) -> Self {
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self.always_show_controls = true;
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self
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}
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}
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impl<'a, Message, Renderer> TitleBar<'a, Message, Renderer>
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where
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Renderer: crate::Renderer,
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{
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/// Draws the [`TitleBar`] with the provided [`Renderer`] and [`Layout`].
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///
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/// [`Renderer`]: crate::widget::pane_grid::Renderer
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pub fn draw(
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&self,
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renderer: &mut Renderer,
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inherited_style: &renderer::Style,
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layout: Layout<'_>,
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cursor_position: Point,
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viewport: &Rectangle,
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show_controls: bool,
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) {
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let bounds = layout.bounds();
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let style = self.style_sheet.style();
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let inherited_style = renderer::Style {
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text_color: style.text_color.unwrap_or(inherited_style.text_color),
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};
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container::draw_background(renderer, &style, bounds);
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let mut children = layout.children();
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let padded = children.next().unwrap();
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let mut children = padded.children();
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let title_layout = children.next().unwrap();
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self.content.draw(
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renderer,
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&inherited_style,
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title_layout,
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cursor_position,
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viewport,
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);
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if let Some(controls) = &self.controls {
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let controls_layout = children.next().unwrap();
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if show_controls || self.always_show_controls {
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controls.draw(
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renderer,
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&inherited_style,
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controls_layout,
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cursor_position,
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viewport,
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);
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}
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}
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}
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/// Returns whether the mouse cursor is over the pick area of the
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/// [`TitleBar`] or not.
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///
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/// The whole [`TitleBar`] is a pick area, except its controls.
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pub fn is_over_pick_area(
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&self,
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layout: Layout<'_>,
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cursor_position: Point,
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) -> bool {
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if layout.bounds().contains(cursor_position) {
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let mut children = layout.children();
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let padded = children.next().unwrap();
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let mut children = padded.children();
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let title_layout = children.next().unwrap();
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if self.controls.is_some() {
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let controls_layout = children.next().unwrap();
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!controls_layout.bounds().contains(cursor_position)
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&& !title_layout.bounds().contains(cursor_position)
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} else {
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!title_layout.bounds().contains(cursor_position)
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}
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} else {
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false
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}
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}
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pub(crate) fn layout(
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&self,
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renderer: &Renderer,
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limits: &layout::Limits,
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) -> layout::Node {
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let limits = limits.pad(self.padding);
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let max_size = limits.max();
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let title_layout = self
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.content
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.layout(renderer, &layout::Limits::new(Size::ZERO, max_size));
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let title_size = title_layout.size();
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let mut node = if let Some(controls) = &self.controls {
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let mut controls_layout = controls
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.layout(renderer, &layout::Limits::new(Size::ZERO, max_size));
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let controls_size = controls_layout.size();
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let space_before_controls = max_size.width - controls_size.width;
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let height = title_size.height.max(controls_size.height);
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controls_layout.move_to(Point::new(space_before_controls, 0.0));
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layout::Node::with_children(
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Size::new(max_size.width, height),
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vec![title_layout, controls_layout],
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)
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} else {
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layout::Node::with_children(
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Size::new(max_size.width, title_size.height),
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vec![title_layout],
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)
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};
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node.move_to(Point::new(
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self.padding.left.into(),
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self.padding.top.into(),
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));
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layout::Node::with_children(node.size().pad(self.padding), vec![node])
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}
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pub(crate) fn on_event(
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&mut self,
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event: Event,
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layout: Layout<'_>,
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cursor_position: Point,
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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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) -> event::Status {
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let mut children = layout.children();
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let padded = children.next().unwrap();
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let mut children = padded.children();
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let title_layout = children.next().unwrap();
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let control_status = if let Some(controls) = &mut self.controls {
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let controls_layout = children.next().unwrap();
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controls.on_event(
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event.clone(),
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controls_layout,
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cursor_position,
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renderer,
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clipboard,
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shell,
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)
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} else {
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event::Status::Ignored
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};
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let title_status = self.content.on_event(
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event,
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title_layout,
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cursor_position,
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renderer,
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clipboard,
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shell,
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);
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control_status.merge(title_status)
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}
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pub(crate) fn mouse_interaction(
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&self,
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layout: Layout<'_>,
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cursor_position: Point,
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viewport: &Rectangle,
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renderer: &Renderer,
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) -> mouse::Interaction {
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let mut children = layout.children();
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let padded = children.next().unwrap();
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let mut children = padded.children();
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let title_layout = children.next().unwrap();
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let title_interaction = self.content.mouse_interaction(
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title_layout,
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cursor_position,
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viewport,
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renderer,
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);
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if let Some(controls) = &self.controls {
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let controls_layout = children.next().unwrap();
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controls
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.mouse_interaction(
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controls_layout,
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cursor_position,
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viewport,
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renderer,
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)
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.max(title_interaction)
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} else {
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title_interaction
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}
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}
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pub(crate) fn overlay(
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&mut self,
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layout: Layout<'_>,
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renderer: &Renderer,
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) -> Option<overlay::Element<'_, Message, Renderer>> {
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let mut children = layout.children();
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let padded = children.next()?;
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let mut children = padded.children();
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let title_layout = children.next()?;
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let Self {
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content, controls, ..
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} = self;
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content.overlay(title_layout, renderer).or_else(move || {
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controls.as_mut().and_then(|controls| {
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let controls_layout = children.next()?;
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controls.overlay(controls_layout, renderer)
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})
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})
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}
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}
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