Add functions to handle event loop manually

* main_steps
* main_step

Author: masche842

ui-sys/src/lib.rs

@@ -24,6 +24,8 @@ extern {
     pub fn uiUninit();
     pub fn uiFreeInitError(err: *const c_char);
 
+    pub fn uiMainSteps();
+    pub fn uiMainStep(wait: c_int) -> c_int;
     pub fn uiMain();
     pub fn uiQuit();
 

ui/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ui"
-version = "0.1.1"
+version = "0.1.2"
 authors = ["Patrick Walton <[email protected]>"]
 
 [dependencies]

ui/src/lib.rs

@@ -14,7 +14,7 @@ pub use controls::{Combobox, Control, DateTimePicker, Entry, FontButton, Group,
 pub use controls::{MultilineEntry, ProgressBar, RadioButtons, Separator, Slider, Spinbox, Tab};
 pub use ffi_utils::Text;
 pub use menus::{Menu, MenuItem};
-pub use ui::{InitError, InitOptions, init, main, msg_box, msg_box_error, on_should_quit};
+pub use ui::{InitError, InitOptions, init, main_steps, main_step, main, msg_box, msg_box_error, on_should_quit};
 pub use ui::{open_file, queue_main, quit, save_file, uninit};
 pub use windows::Window;
 pub use image::Image;

ui/src/ui.rs

@@ -1,7 +1,7 @@
 //! General functions.
 
 use ffi_utils::{self, Text};
-use libc::{c_char, c_void};
+use libc::{c_char, c_int, c_void};
 use std::fmt::{self, Debug, Formatter};
 use std::ffi::{CStr, CString};
 use std::mem;
@@ -13,7 +13,7 @@ use windows::Window;
 pub struct InitOptions;
 
 #[inline]
-pub fn init(_: InitOptions) -> Result<(),InitError> {
+pub fn init(_: InitOptions) -> Result<(), InitError> {
     unsafe {
         let mut init_options = uiInitOptions {
             Size: mem::size_of::<uiInitOptions>(),
@@ -39,6 +39,23 @@ pub fn uninit() {
     }
 }
 
+/// start manual control over event loop
+#[inline]
+pub fn main_steps() {
+    unsafe {
+        ui_sys::uiMainSteps()
+    }
+}
+
+/// advance event loop
+#[inline]
+pub fn main_step(wait: bool) -> bool {
+    unsafe {
+        ui_sys::uiMainStep(if wait { 1 } else { 0 }) > 0
+    }
+}
+
+/// call to start event loop handled by libui
 #[inline]
 pub fn main() {
     unsafe {