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use std::hash::Hash;
use std::any::TypeId;
use std::fmt::Display;
use std::mem;
use user32::SendMessageW;
use winapi::{HWND, HFONT, WPARAM};
use ui::Ui;
use controls::{Control, ControlT, ControlType, AnyHandle};
use error::Error;
use events::Event;
use low::other_helper::{to_utf16, from_utf16};
#[derive(Clone)]
pub struct ComboBoxT<D: Clone+Display+'static, ID: Hash+Clone, S: Clone+Into<String>> {
pub collection: Vec<D>,
pub position: (i32, i32),
pub size: (u32, u32),
pub visible: bool,
pub disabled: bool,
pub placeholder: Option<S>,
pub parent: ID,
pub font: Option<ID>,
}
impl<D: Clone+Display+'static, ID: Hash+Clone, S: Clone+Into<String>> ControlT<ID> for ComboBoxT<D, ID, S> {
fn type_id(&self) -> TypeId { TypeId::of::<ComboBox<D>>() }
fn events(&self) -> Vec<Event> {
vec![Event::Destroyed, Event::SelectionChanged, Event::DoubleClick, Event::Focus, Event::Moved, Event::Resized, Event::Raw]
}
fn build(&self, ui: &Ui<ID>) -> Result<Box<Control>, Error> {
use low::window_helper::{WindowParams, build_window, set_window_font, handle_of_window, handle_of_font};
use low::defs::{CBS_DROPDOWNLIST, CBS_HASSTRINGS, CB_ADDSTRING};
use winapi::{DWORD, WS_VISIBLE, WS_DISABLED, WS_CHILD};
use user32::SendMessageW;
let flags: DWORD = WS_CHILD | CBS_HASSTRINGS | CBS_DROPDOWNLIST |
if self.visible { WS_VISIBLE } else { 0 } |
if self.disabled { WS_DISABLED } else { 0 };
let parent = match handle_of_window(ui, &self.parent, "The parent of a combobox must be a window-like control.") {
Ok(h) => h,
Err(e) => { return Err(e); }
};
let font_handle: Option<HFONT> = match self.font.as_ref() {
Some(font_id) =>
match handle_of_font(ui, &font_id, "The font of a combobox must be a font resource.") {
Ok(h) => Some(h),
Err(e) => { return Err(e); }
},
None => None
};
let params = WindowParams {
title: "",
class_name: "COMBOBOX",
position: self.position.clone(),
size: self.size.clone(),
flags: flags,
ex_flags: Some(0),
parent: parent
};
match unsafe{ build_window(params) } {
Ok(h) => {
unsafe{
set_window_font(h, font_handle, true);
match self.placeholder.as_ref() {
Some(p) => { set_placeholder(h, p.clone()); },
_ => {}
}
let collection: Vec<D> = self.collection.iter().map(
|s|{
let text = to_utf16(format!("{}", s).as_str());
SendMessageW(h, CB_ADDSTRING, 0, mem::transmute(text.as_ptr()));
s.clone()
}
).collect();
Ok( Box::new(ComboBox{handle: h, collection: collection}) )
}
},
Err(e) => Err(Error::System(e))
}
}
}
pub struct ComboBox<D: Clone+Display> {
handle: HWND,
collection: Vec<D>
}
impl<D: Clone+Display> ComboBox<D> {
pub fn len(&self) -> usize { self.collection.len() }
pub fn collection(&self) -> &Vec<D> { &self.collection }
pub fn collection_mut(&mut self) -> &mut Vec<D> { &mut self.collection }
pub fn sync(&self) {
use low::defs::{CB_RESETCONTENT, CB_ADDSTRING};
unsafe{ SendMessageW(self.handle, CB_RESETCONTENT, 0, 0); }
for i in self.collection.iter() {
let text = to_utf16(format!("{}", i).as_str());
unsafe{ SendMessageW(self.handle, CB_ADDSTRING, 0, mem::transmute(text.as_ptr())); }
}
}
pub fn push(&mut self, item: D) {
use low::defs::CB_ADDSTRING;
let text = to_utf16(format!("{}", item).as_str());
unsafe{ SendMessageW(self.handle, CB_ADDSTRING, 0, mem::transmute(text.as_ptr())); }
self.collection.push(item);
}
pub fn remove(&mut self, index: usize) -> D {
use low::defs::CB_DELETESTRING;
unsafe{ SendMessageW(self.handle, CB_DELETESTRING, index as WPARAM, 0); }
self.collection.remove(index)
}
pub fn insert(&mut self, index: usize, item: D) {
use low::defs::CB_INSERTSTRING;
let text = to_utf16(format!("{}", item).as_str());
unsafe{ SendMessageW(self.handle, CB_INSERTSTRING, index as WPARAM, mem::transmute(text.as_ptr())); }
self.collection.insert(index, item);
}
pub fn find_string<'a>(&self, text: &'a str, full_match: bool) -> Option<usize> {
use low::defs::{CB_FINDSTRING, CB_FINDSTRINGEXACT};
let text = to_utf16(text);
let msg = if full_match { CB_FINDSTRINGEXACT } else { CB_FINDSTRING };
let index = unsafe{ SendMessageW(self.handle, msg, -1isize as WPARAM, mem::transmute(text.as_ptr()) ) };
if index == -1 {
None
} else {
Some(index as usize)
}
}
pub fn get_selected_index(&self) -> Option<usize> {
use low::defs::CB_GETCURSEL;
let index = unsafe{ SendMessageW(self.handle, CB_GETCURSEL, 0, 0) };
if index == -1 { None }
else { Some(index as usize) }
}
pub fn get_selected_text(&self) -> String {
unsafe{ ::low::window_helper::get_window_text(self.handle) }
}
pub fn set_selected_index(&self, index: usize) {
use low::defs::CB_SETCURSEL;
unsafe{ SendMessageW(self.handle, CB_SETCURSEL, index as WPARAM, 0); }
}
pub fn get_string(&self, index: usize) -> Option<String> {
use low::defs::{CB_GETLBTEXT, CB_GETLBTEXTLEN};
let length = unsafe{ SendMessageW(self.handle, CB_GETLBTEXTLEN, index as WPARAM, 0) };
if length == -1 { return None; }
let length = (length+1) as usize;
let mut buffer: Vec<u16> = Vec::with_capacity(length);
unsafe {
buffer.set_len(length);
let err = SendMessageW(self.handle, CB_GETLBTEXT, index as WPARAM, mem::transmute( buffer.as_mut_ptr() ));
if err == -1 { return None; }
}
Some( from_utf16(&buffer[..]) )
}
pub fn set_placeholder<'a>(&self, placeholder: &'a str) {
set_placeholder(self.handle, placeholder);
}
pub fn get_dropped_state(&self) -> bool {
use low::defs::CB_GETDROPPEDSTATE;
unsafe{ SendMessageW(self.handle, CB_GETDROPPEDSTATE, 0, 0) != 0 }
}
pub fn set_dropped_state(&self, dropped: bool) {
use low::defs::CB_SHOWDROPDOWN;
unsafe{ SendMessageW(self.handle, CB_SHOWDROPDOWN, dropped as WPARAM, 0); }
}
pub fn clear(&mut self) {
use low::defs::CB_RESETCONTENT;
unsafe{ SendMessageW(self.handle, CB_RESETCONTENT, 0, 0) };
self.collection.clear();
}
pub fn get_visibility(&self) -> bool { unsafe{ ::low::window_helper::get_window_visibility(self.handle) } }
pub fn set_visibility(&self, visible: bool) { unsafe{ ::low::window_helper::set_window_visibility(self.handle, visible); }}
pub fn get_position(&self) -> (i32, i32) { unsafe{ ::low::window_helper::get_window_position(self.handle) } }
pub fn set_position(&self, x: i32, y: i32) { unsafe{ ::low::window_helper::set_window_position(self.handle, x, y); }}
pub fn get_size(&self) -> (u32, u32) { unsafe{ ::low::window_helper::get_window_size(self.handle) } }
pub fn set_size(&self, w: u32, h: u32) { unsafe{ ::low::window_helper::set_window_size(self.handle, w, h, true); } }
pub fn get_enabled(&self) -> bool { unsafe{ ::low::window_helper::get_window_enabled(self.handle) } }
pub fn set_enabled(&self, e:bool) { unsafe{ ::low::window_helper::set_window_enabled(self.handle, e); } }
}
impl<D: Clone+Display> Control for ComboBox<D> {
fn handle(&self) -> AnyHandle {
AnyHandle::HWND(self.handle)
}
fn control_type(&self) -> ControlType {
ControlType::ComboBox
}
fn free(&mut self) {
use user32::DestroyWindow;
unsafe{ DestroyWindow(self.handle) };
}
}
fn set_placeholder<S: Into<String>>(handle: HWND, placeholder: S) {
use low::defs::CB_SETCUEBANNER;
let text = to_utf16(placeholder.into().as_str());
unsafe{ SendMessageW(handle, CB_SETCUEBANNER, 0, mem::transmute(text.as_ptr()) ); }
}