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use std::f32;
use std::os::raw::{c_char, c_void};
use crate::sys;
use crate::window::WindowFlags;
use crate::{Id, Ui};
#[derive(Copy, Clone, Debug)]
#[must_use]
pub struct ChildWindow<'a> {
id: Id<'a>,
flags: WindowFlags,
size: [f32; 2],
content_size: [f32; 2],
focused: bool,
bg_alpha: f32,
border: bool,
}
impl<'a> ChildWindow<'a> {
#[doc(alias = "BeginChildID")]
pub fn new<T: Into<Id<'a>>>(id: T) -> ChildWindow<'a> {
ChildWindow {
id: id.into(),
flags: WindowFlags::empty(),
size: [0.0, 0.0],
content_size: [0.0, 0.0],
focused: false,
bg_alpha: f32::NAN,
border: false,
}
}
#[inline]
pub fn flags(mut self, flags: WindowFlags) -> Self {
self.flags = flags;
self
}
#[inline]
pub fn size(mut self, size: [f32; 2]) -> Self {
self.size = size;
self
}
#[inline]
#[doc(alias = "SetNextWindowContentSize")]
pub fn content_size(mut self, size: [f32; 2]) -> Self {
self.content_size = size;
self
}
#[inline]
#[doc(alias = "SetNextWindwowFocus")]
pub fn focused(mut self, focused: bool) -> Self {
self.focused = focused;
self
}
#[inline]
#[doc(alias = "SetNextWindowContentBgAlpha")]
pub fn bg_alpha(mut self, bg_alpha: f32) -> Self {
self.bg_alpha = bg_alpha;
self
}
#[inline]
pub fn border(mut self, border: bool) -> Self {
self.border = border;
self
}
#[inline]
pub fn movable(mut self, value: bool) -> Self {
self.flags.set(WindowFlags::NO_MOVE, !value);
self
}
#[inline]
pub fn scroll_bar(mut self, value: bool) -> Self {
self.flags.set(WindowFlags::NO_SCROLLBAR, !value);
self
}
#[inline]
pub fn scrollable(mut self, value: bool) -> Self {
self.flags.set(WindowFlags::NO_SCROLL_WITH_MOUSE, !value);
self
}
#[inline]
pub fn always_auto_resize(mut self, value: bool) -> Self {
self.flags.set(WindowFlags::ALWAYS_AUTO_RESIZE, value);
self
}
#[inline]
pub fn draw_background(mut self, value: bool) -> Self {
self.flags.set(WindowFlags::NO_BACKGROUND, !value);
self
}
#[inline]
pub fn mouse_inputs(mut self, value: bool) -> Self {
self.flags.set(WindowFlags::NO_MOUSE_INPUTS, !value);
self
}
#[inline]
pub fn menu_bar(mut self, value: bool) -> Self {
self.flags.set(WindowFlags::MENU_BAR, value);
self
}
#[inline]
pub fn horizontal_scrollbar(mut self, value: bool) -> Self {
self.flags.set(WindowFlags::HORIZONTAL_SCROLLBAR, value);
self
}
#[inline]
pub fn focus_on_appearing(mut self, value: bool) -> Self {
self.flags.set(WindowFlags::NO_FOCUS_ON_APPEARING, !value);
self
}
#[inline]
pub fn bring_to_front_on_focus(mut self, value: bool) -> Self {
self.flags
.set(WindowFlags::NO_BRING_TO_FRONT_ON_FOCUS, !value);
self
}
#[inline]
pub fn always_vertical_scrollbar(mut self, value: bool) -> Self {
self.flags
.set(WindowFlags::ALWAYS_VERTICAL_SCROLLBAR, value);
self
}
#[inline]
pub fn always_horizontal_scrollbar(mut self, value: bool) -> Self {
self.flags
.set(WindowFlags::ALWAYS_HORIZONTAL_SCROLLBAR, value);
self
}
#[inline]
pub fn always_use_window_padding(mut self, value: bool) -> Self {
self.flags
.set(WindowFlags::ALWAYS_USE_WINDOW_PADDING, value);
self
}
#[inline]
pub fn nav_inputs(mut self, value: bool) -> Self {
self.flags.set(WindowFlags::NO_NAV_INPUTS, !value);
self
}
#[inline]
pub fn nav_focus(mut self, value: bool) -> Self {
self.flags.set(WindowFlags::NO_NAV_FOCUS, !value);
self
}
#[inline]
pub fn no_nav(mut self) -> Self {
self.flags |= WindowFlags::NO_NAV;
self
}
#[inline]
pub fn no_inputs(mut self) -> Self {
self.flags |= WindowFlags::NO_INPUTS;
self
}
pub fn begin<'ui>(self, ui: &Ui<'ui>) -> Option<ChildWindowToken<'ui>> {
if self.content_size[0] != 0.0 || self.content_size[1] != 0.0 {
unsafe { sys::igSetNextWindowContentSize(self.content_size.into()) };
}
if self.focused {
unsafe { sys::igSetNextWindowFocus() };
}
if self.bg_alpha.is_finite() {
unsafe { sys::igSetNextWindowBgAlpha(self.bg_alpha) };
}
let id = unsafe {
match self.id {
Id::Int(i) => sys::igGetID_Ptr(i as *const c_void),
Id::Ptr(p) => sys::igGetID_Ptr(p),
Id::Str(s) => {
let start = s.as_ptr() as *const c_char;
let end = start.add(s.len());
sys::igGetID_StrStr(start, end)
}
}
};
let should_render = unsafe {
sys::igBeginChild_ID(id, self.size.into(), self.border, self.flags.bits() as i32)
};
if should_render {
Some(ChildWindowToken::new(ui))
} else {
unsafe { sys::igEndChild() };
None
}
}
pub fn build<T, F: FnOnce() -> T>(self, ui: &Ui<'_>, f: F) -> Option<T> {
self.begin(ui).map(|_window| f())
}
}
create_token!(
pub struct ChildWindowToken<'ui>;
drop { sys::igEndChild() }
);