Active `TabBar` is not highlighted initially

[pombadev]

Hello, I'm following the example verbatim.

cursive-tabs/examples/fullscreen.rs

Lines 1 to 60 in 52e94cb

	use cursive::view::{Nameable, Resizable};
	use cursive::views::{Button, LinearLayout, PaddedView, TextArea, TextView};
	use cursive_tabs::{Align, TabPanel};
	const TAB_0: &str =
	"With using the TabPanel you get a TabView and TabBar, preconfigured for you to use!
	Simply create it with:
	`cursive_tabs::TabPanel::new()`";
	const TAB_1: &str = "You then can add views and configure your panel.";
	const TAB_2: &str =
	"Ofcourse you can also use the provided TabView without the panel, simply create it with:
	`cursive_tabs::TabView::new()`";
	const TAB_3: &str = "All you have to do is add:
	cursive-tabs = \"^0\"
	to your Cargo.toml!
	";
	fn main() {
	let mut siv = cursive::default();
	let panel = TabPanel::new()
	.with_tab(TextView::new(TAB_0).with_name("0"))
	.with_tab(TextView::new(TAB_1).with_name("1"))
	.with_tab(TextView::new(TAB_2).with_name("2"))
	.with_tab(TextView::new(TAB_3).with_name("3"))
	.with_tab(PaddedView::lrtb(2, 2, 1, 1, TextArea::new()).with_name("4"))
	.with_bar_alignment(Align::End)
	.with_active_tab("0")
	.unwrap_or_else(|_| {
	panic!("Could not set the first tab as active tab! This is probably an issue with the implementation in the lib. Please report!");
	});
	siv.add_fullscreen_layer(
	LinearLayout::vertical()
	.child(panel.with_name("Tabs").full_screen())
	.child(
	LinearLayout::horizontal()
	.child(Button::new("Prev", |siv| {
	let mut tabs: cursive::views::ViewRef<TabPanel> =
	siv.find_name("Tabs").expect("id not found");
	tabs.prev();
	}))
	.child(Button::new("Next", |siv| {
	let mut tabs: cursive::views::ViewRef<TabPanel> =
	siv.find_name("Tabs").expect("id not found");
	tabs.next();
	})),
	),
	);
	siv.add_global_callback('q', |siv| siv.quit());
	siv.run();
	}

The active tab name is not highlighted initially even though active tab is being set.

cursive-tabs/examples/fullscreen.rs

Line 34 in 52e94cb

.with_active_tab("0")

Image to illustrate potential bug and expected behavior.

Could be the same issue as #4

Package info: cursive-tabs = "0.7.0"

[FOMX]

I'm pretty new to rust, but i think this is to do with how the buttons are added to the TabBar of the TabPanel. The TabBar isn't public so i can't see how to set the active button easily, but i have a work around below.

Problem:
Adding a tab using the "add_tab/with_tab" methods always sets the active TabBar Button to the last button.

cursive-tabs/src/bar.rs

Lines 121 to 138 in 52e94cb

	impl Bar for TabBar {
	fn add_button(&mut self, tx: Sender<String>, key: &str) {
	let k = key.to_owned();
	let button = Button::new_raw(format!(" {} ", key), move |_| {
	debug!("send {}", k);
	match tx.send(k.clone()) {
	Ok(_) => {}
	Err(err) => {
	debug!("button could not send key: {:?}", err);
	}
	}
	});
	self.children
	.push(PositionWrap::new(button, key.to_owned()));
	self.cursor = Some(self.children.len() - 1);
	self.active = Some(self.children.len() - 1);
	self.invalidated = true;
	}

Adding a tab using the "add_tab_at" method with an index (pos) sets the active TabBarButton to that index.

cursive-tabs/src/bar.rs

Lines 189 to 205 in 52e94cb

	fn add_button_at(&mut self, tx: Sender<String>, key: &str, pos: usize) {
	let k = key.to_owned();
	let button = Button::new_raw(format!(" {} ", key), move |_| {
	debug!("send {}", k);
	match tx.send(k.clone()) {
	Ok(_) => {}
	Err(err) => {
	debug!("button could not send key: {:?}", err);
	}
	}
	});
	self.cursor = Some(pos);
	self.active = Some(pos);
	self.children
	.insert(pos, PositionWrap::new(button, key.to_owned()));
	self.invalidated = true;
	}

Workaround:
Add the desired active tab after you've added the other tabs. This will set it's TabBar Button to be active.
Of course you'll need the "add_tab_at" method so the panel will need to be mutable.

    let mut panel = TabPanel::new().with_tab(TextView::new(TAB_1).with_name("1"))
        .with_tab(TextView::new(TAB_2).with_name("2"))
        .with_tab(TextView::new(TAB_3).with_name("3"))
        .with_tab(PaddedView::lrtb(2, 2, 1, 1, TextArea::new()).with_name("4"))
        .with_bar_alignment(Align::End);
    panel.add_tab_at(TextView::new(TAB_0).with_name("0"), 0);
    panel.set_active_tab("0").unwrap_or_else(|_| {
        panic!("Could not set the first tab as active tab! This is probably an issue with the implementation in the lib. Please report!");
    });

[shi-yan]

How to focus on a tab panel's internal component, instead of one of the tabs?

For example, I have a text editor, I hope to focus on it, instead of the containing tab panel.

Thanks