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//!
//! Safe wrapper for wxScrollBar.
//!
use crate::event::{ScrollEvents, WxEvtHandler};
use crate::geometry::{Point, Size};
use crate::id::Id;
use crate::window::{WindowHandle, WxWidget};
// Window is used by impl_xrc_support for backwards compatibility
#[allow(unused_imports)]
use crate::window::Window;
use std::ffi::CString;
use std::os::raw::c_int;
use wxdragon_sys as ffi;
// --- Style enum using macro ---
widget_style_enum!(
name: ScrollBarStyle,
doc: "Style flags for ScrollBar",
variants: {
Default: ffi::WXD_SB_HORIZONTAL, "Default style (horizontal).",
Vertical: ffi::WXD_SB_VERTICAL, "Vertical scrollbar."
},
default_variant: Default
);
/// Represents a wxScrollBar widget.
///
/// ScrollBar uses `WindowHandle` internally for safe memory management.
/// When the underlying window is destroyed (by calling `destroy()` or when
/// its parent is destroyed), the handle becomes invalid and all operations
/// become safe no-ops.
///
/// # Example
/// ```ignore
/// let scrollbar = ScrollBar::builder(&frame).build();
///
/// // ScrollBar is Copy - no clone needed for closures!
/// scrollbar.bind_scroll(move |_| {
/// // Safe: if scrollbar was destroyed, this is a no-op
/// let pos = scrollbar.thumb_position();
/// });
///
/// // After parent destruction, scrollbar operations are safe no-ops
/// frame.destroy();
/// assert!(!scrollbar.is_valid());
/// ```
#[derive(Clone, Copy)]
pub struct ScrollBar {
/// Safe handle to the underlying wxScrollBar - automatically invalidated on destroy
handle: WindowHandle,
}
impl ScrollBar {
/// Creates a new ScrollBar builder.
pub fn builder(parent: &dyn WxWidget) -> ScrollBarBuilder<'_> {
ScrollBarBuilder::new(parent)
}
/// Helper to get raw scrollbar pointer, returns null if widget has been destroyed
#[inline]
fn scrollbar_ptr(&self) -> *mut ffi::wxd_ScrollBar_t {
self.handle
.get_ptr()
.map(|p| p as *mut ffi::wxd_ScrollBar_t)
.unwrap_or(std::ptr::null_mut())
}
/// Sets the scrollbar properties.
/// No-op if the scrollbar has been destroyed.
pub fn set_scrollbar(&self, position: i32, thumb_size: i32, range: i32, page_size: i32, refresh: bool) {
let ptr = self.scrollbar_ptr();
if ptr.is_null() {
return;
}
unsafe {
ffi::wxd_ScrollBar_SetScrollbar(
ptr,
position as c_int,
thumb_size as c_int,
range as c_int,
page_size as c_int,
refresh,
)
};
}
/// Gets the current position of the scrollbar thumb.
/// Returns 0 if the scrollbar has been destroyed.
pub fn thumb_position(&self) -> i32 {
let ptr = self.scrollbar_ptr();
if ptr.is_null() {
return 0;
}
unsafe { ffi::wxd_ScrollBar_GetThumbPosition(ptr) }
}
/// Returns the underlying WindowHandle for this scrollbar.
pub fn window_handle(&self) -> WindowHandle {
self.handle
}
}
// Implement ScrollEvents trait for ScrollBar
impl ScrollEvents for ScrollBar {}
// Manual WxWidget implementation for ScrollBar (using WindowHandle)
impl WxWidget for ScrollBar {
fn handle_ptr(&self) -> *mut ffi::wxd_Window_t {
self.handle.get_ptr().unwrap_or(std::ptr::null_mut())
}
fn is_valid(&self) -> bool {
self.handle.is_valid()
}
}
// Implement WxEvtHandler for event binding
impl WxEvtHandler for ScrollBar {
unsafe fn get_event_handler_ptr(&self) -> *mut ffi::wxd_EvtHandler_t {
self.handle.get_ptr().unwrap_or(std::ptr::null_mut()) as *mut ffi::wxd_EvtHandler_t
}
}
// Implement common event traits that all Window-based widgets support
impl crate::event::WindowEvents for ScrollBar {}
// Use the widget_builder macro to generate the ScrollBarBuilder implementation
widget_builder!(
name: ScrollBar,
parent_type: &'a dyn WxWidget,
style_type: ScrollBarStyle,
fields: {
name: String = "scrollBar".to_string()
},
build_impl: |slf| {
let c_name = CString::new(slf.name.as_str()).expect("CString::new failed for name");
// Call the FFI function
let ptr = unsafe {
ffi::wxd_ScrollBar_Create(
slf.parent.handle_ptr(),
slf.id,
slf.pos.into(),
slf.size.into(),
slf.style.bits() as ffi::wxd_Style_t,
c_name.as_ptr(),
)
};
if ptr.is_null() {
panic!("Failed to create ScrollBar: FFI returned null pointer");
}
// Create a WindowHandle which automatically registers for destroy events
ScrollBar {
handle: WindowHandle::new(ptr as *mut ffi::wxd_Window_t),
}
}
);
// XRC Support - enables ScrollBar to be created from XRC-managed pointers
#[cfg(feature = "xrc")]
impl crate::xrc::XrcSupport for ScrollBar {
unsafe fn from_xrc_ptr(ptr: *mut ffi::wxd_Window_t) -> Self {
ScrollBar {
handle: WindowHandle::new(ptr),
}
}
}
// Widget casting support for ScrollBar
impl crate::window::FromWindowWithClassName for ScrollBar {
fn class_name() -> &'static str {
"wxScrollBar"
}
unsafe fn from_ptr(ptr: *mut ffi::wxd_Window_t) -> Self {
ScrollBar {
handle: WindowHandle::new(ptr),
}
}
}