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use std::collections::{HashMap, VecDeque};
use std::mem;
use tracing::{error, info, trace_span};
use instant::Instant;
use crate::piet::{Color, Piet, RenderContext};
use crate::shell::{text::InputHandler, Counter, Cursor, Region, TextFieldToken, WindowHandle};
use crate::app::{PendingWindow, WindowSizePolicy};
use crate::contexts::ContextState;
use crate::core::{CommandQueue, FocusChange, WidgetState};
use crate::debug_state::DebugState;
use crate::menu::{MenuItemId, MenuManager};
use crate::text::TextFieldRegistration;
use crate::widget::LabelText;
use crate::win_handler::RUN_COMMANDS_TOKEN;
use crate::{
BoxConstraints, Data, Env, Event, EventCtx, ExtEventSink, Handled, InternalEvent,
InternalLifeCycle, LayoutCtx, LifeCycle, LifeCycleCtx, Menu, PaintCtx, Point, Size, TimerToken,
UpdateCtx, ViewContext, Widget, WidgetId, WidgetPod,
};
pub type ImeUpdateFn = dyn FnOnce(crate::shell::text::Event);
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub struct WindowId(u64);
pub struct Window<T> {
pub(crate) id: WindowId,
pub(crate) root: WidgetPod<T, Box<dyn Widget<T>>>,
pub(crate) title: LabelText<T>,
size_policy: WindowSizePolicy,
size: Size,
invalid: Region,
pub(crate) menu: Option<MenuManager<T>>,
pub(crate) context_menu: Option<(MenuManager<T>, Point)>,
pub(crate) last_anim: Option<Instant>,
pub(crate) last_mouse_pos: Option<Point>,
pub(crate) focus: Option<WidgetId>,
pub(crate) handle: WindowHandle,
pub(crate) timers: HashMap<TimerToken, WidgetId>,
pub(crate) pending_text_registrations: Vec<TextFieldRegistration>,
pub(crate) transparent: bool,
pub(crate) ime_handlers: Vec<(TextFieldToken, TextFieldRegistration)>,
ext_handle: ExtEventSink,
pub(crate) ime_focus_change: Option<Option<TextFieldToken>>,
}
impl<T> Window<T> {
pub(crate) fn new(
id: WindowId,
handle: WindowHandle,
pending: PendingWindow<T>,
ext_handle: ExtEventSink,
) -> Window<T> {
Window {
id,
root: WidgetPod::new(pending.root),
size_policy: pending.size_policy,
size: Size::ZERO,
invalid: Region::EMPTY,
title: pending.title,
transparent: pending.transparent,
menu: pending.menu,
context_menu: None,
last_anim: None,
last_mouse_pos: None,
focus: None,
handle,
timers: HashMap::new(),
ext_handle,
ime_handlers: Vec::new(),
ime_focus_change: None,
pending_text_registrations: Vec::new(),
}
}
}
impl<T: Data> Window<T> {
pub(crate) fn wants_animation_frame(&self) -> bool {
self.root.state().request_anim
}
pub(crate) fn focus_chain(&self) -> &[WidgetId] {
&self.root.state().focus_chain
}
pub(crate) fn may_contain_widget(&self, widget_id: WidgetId) -> bool {
widget_id == self.root.id() || self.root.state().children.may_contain(&widget_id)
}
pub(crate) fn menu_cmd(
&mut self,
queue: &mut CommandQueue,
cmd_id: MenuItemId,
data: &mut T,
env: &Env,
) {
if let Some(menu) = &mut self.menu {
menu.event(queue, Some(self.id), cmd_id, data, env);
}
if let Some((menu, _)) = &mut self.context_menu {
menu.event(queue, Some(self.id), cmd_id, data, env);
}
}
pub(crate) fn show_context_menu(&mut self, menu: Menu<T>, point: Point, data: &T, env: &Env) {
let mut manager = MenuManager::new_for_popup(menu);
self.handle
.show_context_menu(manager.initialize(Some(self.id), data, env), point);
self.context_menu = Some((manager, point));
}
#[cfg(target_os = "macos")]
pub(crate) fn macos_update_app_menu(&mut self, data: &T, env: &Env) {
if let Some(menu) = self.menu.as_mut() {
self.handle.set_menu(menu.refresh(data, env));
}
}
fn post_event_processing(
&mut self,
widget_state: &mut WidgetState,
queue: &mut CommandQueue,
data: &T,
env: &Env,
process_commands: bool,
) {
if widget_state.children_changed {
let Window {
ime_handlers,
handle,
..
} = self;
ime_handlers.retain(|(token, v)| {
let will_retain = v.is_alive();
if !will_retain {
tracing::debug!("{:?} removed", token);
handle.remove_text_field(*token);
}
will_retain
});
self.lifecycle(
queue,
&LifeCycle::Internal(InternalLifeCycle::RouteWidgetAdded),
data,
env,
false,
);
}
if widget_state.children_view_context_changed && !widget_state.needs_layout {
let event =
LifeCycle::Internal(InternalLifeCycle::RouteViewContextChanged(ViewContext {
window_origin: Point::ORIGIN, last_mouse_position: self.last_mouse_pos,
clip: self.size.to_rect(),
}));
self.lifecycle(queue, &event, data, env, false);
}
if widget_state.tree_disabled_changed() {
let event = LifeCycle::Internal(InternalLifeCycle::RouteDisabledChanged);
self.lifecycle(queue, &event, data, env, false);
}
if widget_state.update_focus_chain {
let event = LifeCycle::BuildFocusChain;
self.lifecycle(queue, &event, data, env, false);
}
self.update_focus(widget_state, queue, data, env);
if self.wants_animation_frame() {
self.handle.request_anim_frame();
}
self.invalid.union_with(&widget_state.invalid);
for ime_field in self.pending_text_registrations.drain(..) {
let token = self.handle.add_text_field();
tracing::debug!("{:?} added", token);
self.ime_handlers.push((token, ime_field));
}
if process_commands && !queue.is_empty() {
if let Some(mut handle) = self.handle.get_idle_handle() {
handle.schedule_idle(RUN_COMMANDS_TOKEN);
} else {
error!("failed to get idle handle");
}
}
}
pub(crate) fn event(
&mut self,
queue: &mut CommandQueue,
event: Event,
data: &mut T,
env: &Env,
) -> Handled {
match &event {
Event::WindowSize(size) => self.size = *size,
Event::MouseDown(e) | Event::MouseUp(e) | Event::MouseMove(e) | Event::Wheel(e) => {
self.last_mouse_pos = Some(e.pos)
}
Event::Internal(InternalEvent::MouseLeave) => self.last_mouse_pos = None,
_ => (),
}
let event = match event {
Event::Timer(token) => {
if let Some(widget_id) = self.timers.remove(&token) {
Event::Internal(InternalEvent::RouteTimer(token, widget_id))
} else {
error!("No widget found for timer {:?}", token);
return Handled::No;
}
}
other => other,
};
if let Event::WindowConnected = event {
self.lifecycle(
queue,
&LifeCycle::Internal(InternalLifeCycle::RouteWidgetAdded),
data,
env,
false,
);
}
let mut widget_state = WidgetState::new(self.root.id(), Some(self.size));
let is_handled = {
let mut state = ContextState::new::<T>(
queue,
&self.ext_handle,
&self.handle,
self.id,
self.focus,
&mut self.timers,
&mut self.pending_text_registrations,
);
let mut notifications = VecDeque::new();
let mut ctx = EventCtx {
state: &mut state,
notifications: &mut notifications,
widget_state: &mut widget_state,
is_handled: false,
is_root: true,
};
{
let _span = trace_span!("event");
let _span = _span.enter();
self.root.event(&mut ctx, &event, data, env);
}
ctx.notifications.retain(|n| n.warn_if_unused_set());
if !ctx.notifications.is_empty() {
info!("{} unhandled notifications:", ctx.notifications.len());
for (i, n) in ctx.notifications.iter().enumerate() {
info!("{}: {:?}", i, n);
}
info!(
"if this was intended use EventCtx::submit_notification_without_warning instead"
);
}
Handled::from(ctx.is_handled)
};
if let Some(cursor) = &widget_state.cursor {
self.handle.set_cursor(cursor);
} else if matches!(
event,
Event::MouseMove(..) | Event::Internal(InternalEvent::MouseLeave)
) {
self.handle.set_cursor(&Cursor::Arrow);
}
if matches!(
(event, self.size_policy),
(Event::WindowSize(_), WindowSizePolicy::Content)
) {
self.layout(queue, data, env);
}
self.post_event_processing(&mut widget_state, queue, data, env, false);
is_handled
}
pub(crate) fn lifecycle(
&mut self,
queue: &mut CommandQueue,
event: &LifeCycle,
data: &T,
env: &Env,
process_commands: bool,
) {
let mut widget_state = WidgetState::new(self.root.id(), Some(self.size));
let mut state = ContextState::new::<T>(
queue,
&self.ext_handle,
&self.handle,
self.id,
self.focus,
&mut self.timers,
&mut self.pending_text_registrations,
);
let mut ctx = LifeCycleCtx {
state: &mut state,
widget_state: &mut widget_state,
};
{
let _span = trace_span!("lifecycle");
let _span = _span.enter();
self.root.lifecycle(&mut ctx, event, data, env);
}
self.post_event_processing(&mut widget_state, queue, data, env, process_commands);
}
pub(crate) fn update(&mut self, queue: &mut CommandQueue, data: &T, env: &Env) {
self.update_title(data, env);
let mut widget_state = WidgetState::new(self.root.id(), Some(self.size));
let mut state = ContextState::new::<T>(
queue,
&self.ext_handle,
&self.handle,
self.id,
self.focus,
&mut self.timers,
&mut self.pending_text_registrations,
);
let mut update_ctx = UpdateCtx {
widget_state: &mut widget_state,
state: &mut state,
prev_env: None,
env,
};
{
let _span = trace_span!("update");
let _span = _span.enter();
self.root.update(&mut update_ctx, data, env);
}
if let Some(cursor) = &widget_state.cursor {
self.handle.set_cursor(cursor);
}
self.post_event_processing(&mut widget_state, queue, data, env, false);
}
pub(crate) fn invalidate_and_finalize(&mut self) {
if self.root.state().needs_layout {
self.handle.invalidate();
} else {
for rect in self.invalid.rects() {
self.handle.invalidate_rect(*rect);
}
}
self.invalid.clear();
}
#[allow(dead_code)]
pub(crate) fn invalid(&self) -> &Region {
&self.invalid
}
#[allow(dead_code)]
pub(crate) fn invalid_mut(&mut self) -> &mut Region {
&mut self.invalid
}
pub(crate) fn prepare_paint(&mut self, queue: &mut CommandQueue, data: &mut T, env: &Env) {
let now = Instant::now();
let last = self.last_anim.take();
let elapsed_ns = last.map(|t| now.duration_since(t).as_nanos()).unwrap_or(0) as u64;
if self.wants_animation_frame() {
self.event(queue, Event::AnimFrame(elapsed_ns), data, env);
self.last_anim = Some(now);
}
}
pub(crate) fn do_paint(
&mut self,
piet: &mut Piet,
invalid: &Region,
queue: &mut CommandQueue,
data: &T,
env: &Env,
) {
if self.root.state().needs_layout {
self.layout(queue, data, env);
}
for &r in invalid.rects() {
piet.clear(
Some(r),
if self.transparent {
Color::TRANSPARENT
} else {
env.get(crate::theme::WINDOW_BACKGROUND_COLOR)
},
);
}
self.paint(piet, invalid, queue, data, env);
}
fn layout(&mut self, queue: &mut CommandQueue, data: &T, env: &Env) {
let mut widget_state = WidgetState::new(self.root.id(), Some(self.size));
let mut state = ContextState::new::<T>(
queue,
&self.ext_handle,
&self.handle,
self.id,
self.focus,
&mut self.timers,
&mut self.pending_text_registrations,
);
let mut layout_ctx = LayoutCtx {
state: &mut state,
widget_state: &mut widget_state,
};
let bc = match self.size_policy {
WindowSizePolicy::User => BoxConstraints::tight(self.size),
WindowSizePolicy::Content => BoxConstraints::UNBOUNDED,
};
let content_size = {
let _span = trace_span!("layout");
let _span = _span.enter();
self.root.layout(&mut layout_ctx, &bc, data, env)
};
if let WindowSizePolicy::Content = self.size_policy {
let insets = self.handle.content_insets();
let full_size = (content_size.to_rect() + insets).size();
if self.size != full_size {
self.size = full_size;
self.handle.set_size(full_size)
}
}
self.root.set_origin(&mut layout_ctx, Point::ORIGIN);
self.post_event_processing(&mut widget_state, queue, data, env, true);
}
#[cfg(not(target_arch = "wasm32"))]
pub(crate) fn just_layout(&mut self, queue: &mut CommandQueue, data: &T, env: &Env) {
self.layout(queue, data, env)
}
fn paint(
&mut self,
piet: &mut Piet,
invalid: &Region,
queue: &mut CommandQueue,
data: &T,
env: &Env,
) {
let widget_state = WidgetState::new(self.root.id(), Some(self.size));
let mut state = ContextState::new::<T>(
queue,
&self.ext_handle,
&self.handle,
self.id,
self.focus,
&mut self.timers,
&mut self.pending_text_registrations,
);
let mut ctx = PaintCtx {
render_ctx: piet,
state: &mut state,
widget_state: &widget_state,
z_ops: Vec::new(),
region: invalid.clone(),
depth: 0,
};
let root = &mut self.root;
trace_span!("paint").in_scope(|| {
ctx.with_child_ctx(invalid.clone(), |ctx| root.paint_raw(ctx, data, env));
});
let mut z_ops = mem::take(&mut ctx.z_ops);
z_ops.sort_by_key(|k| k.z_index);
for z_op in z_ops.into_iter() {
ctx.with_child_ctx(invalid.clone(), |ctx| {
ctx.with_save(|ctx| {
ctx.render_ctx.transform(z_op.transform);
(z_op.paint_func)(ctx);
});
});
}
if self.wants_animation_frame() {
self.handle.request_anim_frame();
}
}
pub fn root_debug_state(&self, data: &T) -> DebugState {
self.root.widget().debug_state(data)
}
pub(crate) fn update_title(&mut self, data: &T, env: &Env) {
if self.title.resolve(data, env) {
self.handle.set_title(&self.title.display_text());
}
}
pub(crate) fn update_menu(&mut self, data: &T, env: &Env) {
if let Some(menu) = &mut self.menu {
if let Some(new_menu) = menu.update(Some(self.id), data, env) {
self.handle.set_menu(new_menu);
}
}
if let Some((menu, point)) = &mut self.context_menu {
if let Some(new_menu) = menu.update(Some(self.id), data, env) {
self.handle.show_context_menu(new_menu, *point);
}
}
}
pub(crate) fn get_ime_handler(
&mut self,
req_token: TextFieldToken,
mutable: bool,
) -> Box<dyn InputHandler> {
self.ime_handlers
.iter()
.find(|(token, _)| req_token == *token)
.and_then(|(_, reg)| reg.document.acquire(mutable))
.unwrap()
}
fn update_focus(
&mut self,
widget_state: &mut WidgetState,
queue: &mut CommandQueue,
data: &T,
env: &Env,
) {
if let Some(focus_req) = widget_state.request_focus.take() {
let old = self.focus;
let new = self.widget_for_focus_request(focus_req);
if old != new {
let event = LifeCycle::Internal(InternalLifeCycle::RouteFocusChanged { old, new });
self.lifecycle(queue, &event, data, env, false);
self.focus = new;
let old_was_ime = old
.map(|old| {
self.ime_handlers
.iter()
.any(|(_, sesh)| sesh.widget_id == old)
})
.unwrap_or(false);
let maybe_active_text_field = self
.ime_handlers
.iter()
.find(|(_, sesh)| Some(sesh.widget_id) == self.focus)
.map(|(token, _)| *token);
self.ime_focus_change = if maybe_active_text_field.is_some() {
Some(maybe_active_text_field)
} else if old_was_ime {
Some(None)
} else {
None
};
}
}
}
pub(crate) fn ime_invalidation_fn(&self, widget: WidgetId) -> Option<Box<ImeUpdateFn>> {
let token = self
.ime_handlers
.iter()
.find(|(_, reg)| reg.widget_id == widget)
.map(|(t, _)| *t)?;
let window_handle = self.handle.clone();
Some(Box::new(move |event| {
window_handle.update_text_field(token, event)
}))
}
pub(crate) fn release_ime_lock(&mut self, req_token: TextFieldToken) -> Option<WidgetId> {
self.ime_handlers
.iter()
.find(|(token, _)| req_token == *token)
.and_then(|(_, reg)| reg.document.release().then_some(reg.widget_id))
}
fn widget_for_focus_request(&self, focus: FocusChange) -> Option<WidgetId> {
match focus {
FocusChange::Resign => None,
FocusChange::Focus(id) => Some(id),
FocusChange::Next => self.widget_from_focus_chain(true),
FocusChange::Previous => self.widget_from_focus_chain(false),
}
}
fn widget_from_focus_chain(&self, forward: bool) -> Option<WidgetId> {
self.focus.and_then(|focus| {
self.focus_chain()
.iter()
.position(|id| id == &focus)
.map(|idx| {
let len = self.focus_chain().len();
let new_idx = if forward {
(idx + 1) % len
} else {
(idx + len - 1) % len
};
self.focus_chain()[new_idx]
})
.or_else(|| {
if forward {
self.focus_chain().first().copied()
} else {
self.focus_chain().last().copied()
}
})
})
}
}
impl WindowId {
pub fn next() -> WindowId {
static WINDOW_COUNTER: Counter = Counter::new();
WindowId(WINDOW_COUNTER.next())
}
}