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use crate::decl::*;
use crate::gui::{*, iterators::*};
use crate::msg::*;
use crate::prelude::*;
/// Exposes item methods of a [`ComboBox`](crate::gui::ComboBox) control.
///
/// You cannot directly instantiate this object, it is created internally by the
/// control.
pub struct ComboBoxItems<'a> {
owner: &'a ComboBox,
}
impl<'a> ComboBoxItems<'a> {
#[must_use]
pub(in crate::gui) const fn new(owner: &'a ComboBox) -> Self {
Self { owner }
}
/// Adds new texts by sending [`cb::AddString`](crate::msg::cb::AddString)
/// messages.
///
/// # Examples
///
/// ```no_run
/// use winsafe::{self as w, prelude::*, gui};
///
/// let my_combo: gui::ComboBox; // initialized somewhere
/// # let wnd = gui::WindowMain::new(gui::WindowMainOpts::default());
/// # let my_combo = gui::ComboBox::new(&wnd, gui::ComboBoxOpts::default());
///
/// my_combo.items().add(&["John", "Mary"]);
/// ```
pub fn add(&self, items: &[impl AsRef<str>]) {
for text in items.iter() {
unsafe {
self.owner.hwnd()
.SendMessage(cb::AddString {
text: WString::from_str(text.as_ref()),
})
}.unwrap();
}
}
/// Retrieves the number of items by sending a
/// [`cb::GetCount`](crate::msg::cb::GetCount) message.
#[must_use]
pub fn count(&self) -> u32 {
unsafe {
self.owner.hwnd()
.SendMessage(cb::GetCount {})
}.unwrap()
}
/// Deletes the item at the given index by sending a
/// [`cb::DeleteString`](crate::msg::cb::DeleteString) message.
///
/// # Panics
///
/// Panics if the index is invalid.
pub fn delete(&self, index: u32) {
unsafe {
self.owner.hwnd()
.SendMessage(cb::DeleteString { index })
}.unwrap();
}
/// Deletes all items by sending a
/// [`cb::ResetContent`](crate::msg::cb::ResetContent) message.
pub fn delete_all(&self) {
unsafe { self.owner.hwnd().SendMessage(cb::ResetContent {}); }
}
/// Returns an iterator over the texts.
///
/// # Examples
///
/// ```no_run
/// use winsafe::{self as w, prelude::*, gui};
///
/// let my_combo: gui::ComboBox; // initialized somewhere
/// # let wnd = gui::WindowMain::new(gui::WindowMainOpts::default());
/// # let my_combo = gui::ComboBox::new(&wnd, gui::ComboBoxOpts::default());
///
/// for text in my_combo.items().iter() {
/// println!("Text {}", text);
/// }
/// ```
#[must_use]
pub fn iter(&self) -> impl Iterator<Item = String> + 'a {
ComboBoxItemIter::new(self.owner)
}
/// Sets the currently selected index, or clears it, by sending a
/// [`cb::SetCurSel`](crate::msg::cb::SetCurSel) message.
pub fn select(&self, index: Option<u32>) {
unsafe {
self.owner.hwnd()
.SendMessage(cb::SetCurSel { index });
}
}
/// Retrieves the index of the currently selected item, if any, by sending a
/// [`cb::GetCurSel`](crate::msg::cb::GetCurSel) message.
#[must_use]
pub fn selected_index(&self) -> Option<u32> {
unsafe { self.owner.hwnd().SendMessage(cb::GetCurSel {}) }
}
/// Retrieves the currently selected text, if any, by calling
/// [`selected_index`](crate::gui::spec::ComboBoxItems::selected_index) and
/// [`text`](crate::gui::spec::ComboBoxItems::text) methods.
#[must_use]
pub fn selected_text(&self) -> Option<String> {
self.selected_index()
.map(|idx| self.text(idx))
}
/// Retrieves the text at the given position, if any, by sending a
/// [`cb::GetLbText`](crate::msg::cb::GetLbText) message.
///
/// # Panics
///
/// Panics if the index is invalid.
#[must_use]
pub fn text(&self, index: u32) -> String {
let num_chars = unsafe {
self.owner.hwnd()
.SendMessage(cb::GetLbTextLen { index })
}.unwrap();
let mut buf = WString::new_alloc_buf(num_chars as usize + 1);
unsafe {
self.owner.hwnd()
.SendMessage(cb::GetLbText { index, text: &mut buf })
}.unwrap();
buf.to_string()
}
}