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//! Single-line text input widget.
//!
//! Wraps [`QLineEdit`](https://doc.qt.io/qt-6/qlineedit.html).
use cxx::let_cxx_string;
use crate::ffi;
use crate::signal;
use crate::widget::AsWidget;
/// A single-line text input field.
///
/// `LineEdit` uses a **builder pattern**: call [`LineEdit::new`] to obtain
/// a [`Builder`], chain `.on_return_pressed(f)`, `.parent(w)`, then call
/// `.build()`.
///
/// # Signals
///
/// | Method | Qt signal | When |
/// |---|---|---|
/// | [`Builder::on_return_pressed`] | `QLineEdit::returnPressed` | User presses Enter/Return |
///
/// # Text caching
///
/// The widget stores a local copy of the text. It is updated when you
/// call [`set_text`](Self::set_text) or [`refresh_text`](Self::refresh_text).
/// The getter [`text`](Self::text) returns the cached copy without any
/// FFI call.
///
/// # Memory safety
///
/// See [`PushButton`] for signal-closure lifecycle rules — the same
/// parent/no-parent leak/reclaim logic applies here.
///
/// [`PushButton`]: crate::PushButton
///
/// # Example
///
/// ```no_run
/// use qtrs::LineEdit;
///
/// let edit = LineEdit::new("type here...")
/// .on_return_pressed(|| println!("Enter pressed!"))
/// .build();
/// ```
pub struct LineEdit {
ptr: *mut ffi::QLineEdit,
has_parent: bool,
#[allow(dead_code)]
text: String,
signal_handles: Vec<crate::signal::SignalHandle>,
}
impl LineEdit {
/// Start building a new `QLineEdit`.
///
/// Returns a [`Builder`]. Set placeholder text (via the initial value),
/// optional callbacks, and an optional parent, then call `.build()`.
pub fn new(text: impl Into<String>) -> Builder {
Builder::new(text.into())
}
/// Get the cached text.
///
/// To read the live value from the Qt widget, call
/// [`refresh_text`](Self::refresh_text) first.
pub fn text(&self) -> &str {
&self.text
}
/// Re-read the current text from the Qt widget.
///
/// This fetches `QLineEdit::text()` via FFI and updates the local
/// cache returned by [`text`](Self::text).
pub fn refresh_text(&mut self) {
debug_assert!(!self.ptr.is_null(), "LineEdit::refresh_text on null pointer");
self.text = unsafe { ffi::QLineEdit_text(self.ptr) };
}
/// Set the text at runtime.
pub fn set_text(&mut self, text: impl Into<String>) {
debug_assert!(!self.ptr.is_null(), "LineEdit::set_text on null pointer");
self.text = text.into();
let_cxx_string!(c_text = &self.text);
unsafe { ffi::QLineEdit_setText(self.ptr, &c_text); }
}
/// Connect a return-pressed callback to an already-existing widget.
pub fn connect_return_pressed<F: Fn() + 'static>(&mut self, f: F) {
debug_assert!(!self.ptr.is_null());
let handle = signal::leak_void(f);
unsafe { ffi::QLineEdit_onReturnPressed(self.ptr, handle.token); }
self.signal_handles.push(handle);
}
#[doc(hidden)]
pub(crate) fn from_raw(ptr: *mut ffi::QLineEdit, text: &str) -> Self {
debug_assert!(!ptr.is_null());
Self { ptr, has_parent: true, text: text.to_string(), signal_handles: Vec::new() }
}
}
impl AsWidget for LineEdit {
fn widget_ptr(&self) -> *mut ffi::QWidget {
debug_assert!(!self.ptr.is_null(), "LineEdit::widget_ptr on null pointer");
unsafe { ffi::toQWidget_QLineEdit(self.ptr) }
}
fn set_has_parent(&mut self) {
self.has_parent = true;
}
}
impl Drop for LineEdit {
fn drop(&mut self) {
if self.ptr.is_null() { return; }
if self.has_parent {
unsafe { ffi::QWidget_disconnectAll(self.ptr as *mut _); }
for h in self.signal_handles.drain(..) {
unsafe { h.reclaim(); }
}
} else {
for h in self.signal_handles.drain(..) {
unsafe { h.reclaim(); }
}
unsafe { ffi::QLineEdit_delete(self.ptr) };
}
self.ptr = std::ptr::null_mut();
}
}
// ============================================================
// Builder
// ============================================================
/// Builder for [`LineEdit`].
///
/// Collects initial text, signal callbacks, and parent, then creates the
/// C++ `QLineEdit` (and connects signals) in [`build`](Self::build).
pub struct Builder {
text: String,
on_return_pressed: Option<Box<dyn Fn()>>,
parent: Option<*mut ffi::QWidget>,
}
impl Builder {
fn new(text: String) -> Self {
Self {
text,
on_return_pressed: None,
parent: None,
}
}
/// Set the callback for when the user presses Enter/Return.
///
/// The closure is stored on the heap and reclaimed when the widget
/// is dropped (only if the widget has no Qt parent).
pub fn on_return_pressed<F: Fn() + 'static>(mut self, f: F) -> Self {
self.on_return_pressed = Some(Box::new(f));
self
}
/// Set the parent widget.
///
/// The parent manages the line-edit's C++ lifetime.
pub fn parent(mut self, parent: &dyn AsWidget) -> Self {
self.parent = Some(parent.widget_ptr());
self
}
/// Create the C++ `QLineEdit`, connect signals, and return the Rust
/// wrapper.
///
/// This is the terminal method of the builder pattern.
pub fn build(self) -> LineEdit {
let_cxx_string!(c_text = &self.text);
let ptr = unsafe {
ffi::QLineEdit_new(
&c_text,
self.parent.unwrap_or(std::ptr::null_mut()),
)
};
assert!(!ptr.is_null(), "QLineEdit_new returned null");
let has_parent = self.parent.is_some();
let mut signal_handles = Vec::new();
if let Some(cb) = self.on_return_pressed {
let handle = signal::leak_void(cb);
unsafe { ffi::QLineEdit_onReturnPressed(ptr, handle.token); }
signal_handles.push(handle);
}
LineEdit {
ptr,
has_parent,
text: self.text,
signal_handles,
}
}
/// Build and show the widget.
pub fn show(self) -> LineEdit {
self.build()
}
}