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use proc_macro2::TokenStream as TokenStream2;
use quote::{quote, quote_spanned};
use syn::spanned::Spanned;
use syn::Ident;
use crate::widgets::{
AssignProperty, AssignPropertyAttr, ConditionalBranches, ConditionalWidget, MatchArm,
Properties, Property, PropertyName, PropertyType, ReturnedWidget, Widget,
};
use super::{assign::AssignInfo, util::WidgetFieldsScope};
impl Property {
fn update_view_stream(
&self,
stream: &mut TokenStream2,
w_name: &Ident,
model_name: &Ident,
conditional_branch: bool,
) {
match &self.ty {
PropertyType::Assign(assign) => assign.update_view_stream(
stream,
&self.name,
w_name,
model_name,
conditional_branch,
),
PropertyType::Widget(widget) => {
widget.update_view_stream(stream, model_name, conditional_branch);
}
PropertyType::ConditionalWidget(cond_widget) => {
cond_widget.update_view_stream(stream, model_name);
}
PropertyType::SignalHandler(_) | PropertyType::ParseError(_) => (),
}
}
}
impl Properties {
fn update_view_stream(
&self,
stream: &mut TokenStream2,
w_name: &Ident,
model_name: &Ident,
conditional_branch: bool,
) {
for prop in &self.properties {
prop.update_view_stream(stream, w_name, model_name, conditional_branch);
}
}
}
impl Widget {
pub(crate) fn init_update_view_stream(&self, stream: &mut TokenStream2, model_name: &Ident) {
self.update_view_stream(stream, model_name, false);
}
fn update_view_stream(
&self,
stream: &mut TokenStream2,
model_name: &Ident,
conditional_branch: bool,
) {
self.get_template_child_in_scope(stream, WidgetFieldsScope::ViewUpdate);
let w_name = &self.name;
self.properties
.update_view_stream(stream, w_name, model_name, conditional_branch);
if let Some(returned_widget) = &self.returned_widget {
returned_widget.update_view_stream(stream, model_name, conditional_branch);
}
}
}
impl ConditionalWidget {
fn update_view_stream(&self, stream: &mut TokenStream2, model_name: &Ident) {
let brach_stream = match &self.branches {
ConditionalBranches::If(if_branches) => {
let mut stream = TokenStream2::new();
for (index, branch) in if_branches.iter().enumerate() {
let mut inner_update_stream = TokenStream2::new();
branch
.widget
.update_view_stream(&mut inner_update_stream, model_name, true);
branch.update_stream(&mut stream, &inner_update_stream, index);
}
stream
}
ConditionalBranches::Match((match_token, expr, match_arms)) => {
let mut inner_tokens = TokenStream2::new();
for (index, match_arm) in match_arms.iter().enumerate() {
let mut inner_update_stream = TokenStream2::new();
match_arm
.widget
.update_view_stream(&mut inner_update_stream, model_name, true);
let MatchArm {
pattern,
guard,
arrow,
..
} = match_arm;
let (guard_if, guard_expr) = if let Some((guard_if, guard_expr)) = guard {
(Some(guard_if), Some(guard_expr))
} else {
(None, None)
};
let index = index.to_string();
inner_tokens.extend(quote! {
#pattern #guard_if #guard_expr #arrow {
let __page_active: bool = (__current_page == #index);
#inner_update_stream
#index
},
});
}
quote! {
#match_token #expr {
#inner_tokens
}
}
}
};
let w_name = &self.name;
stream.extend(quote_spanned! {
w_name.span() =>
let __current_page = #w_name.visible_child_name().map_or("".to_string(), |s| s.as_str().to_string());
#w_name.set_visible_child_name(#brach_stream);
});
}
}
impl ReturnedWidget {
fn update_view_stream(
&self,
stream: &mut TokenStream2,
model_name: &Ident,
conditional_branch: bool,
) {
let w_name = &self.name;
self.properties
.update_view_stream(stream, w_name, model_name, conditional_branch);
}
}
impl AssignProperty {
fn update_view_stream(
&self,
stream: &mut TokenStream2,
p_name: &PropertyName,
w_name: &Ident,
model_name: &Ident,
conditional_branch: bool,
) {
match &self.attr {
AssignPropertyAttr::None => (),
AssignPropertyAttr::Watch => {
let mut info = AssignInfo {
stream,
widget_name: w_name,
is_conditional: false,
};
self.assign_stream(&mut info, p_name, false);
}
AssignPropertyAttr::Track((track_stream, paste_model)) => {
let mut assign_stream = TokenStream2::new();
let mut info = AssignInfo {
stream: &mut assign_stream,
widget_name: w_name,
is_conditional: false,
};
self.assign_stream(&mut info, p_name, false);
let model = paste_model.then(|| model_name);
let page_switch = conditional_branch.then(|| {
quote_spanned! {
p_name.span() =>
!__page_active ||
}
});
stream.extend(quote! {
if #page_switch (#model #track_stream) {
#assign_stream
}
});
}
}
}
}