Fix wrong resize size return (#526)

Cargo.toml

@@ -47,7 +47,7 @@ version = "0.3.8"
 features = ["winuser"]
 
 [target.'cfg(windows)'.dependencies]
-crossterm_winapi = "0.6.2"
+crossterm_winapi = "0.7.0"
 
 #
 # UNIX dependencies

examples/event-read.rs

@@ -4,6 +4,7 @@
 
 use std::io::stdout;
 
+use crossterm::event::poll;
 use crossterm::{
     cursor::position,
     event::{read, DisableMouseCapture, EnableMouseCapture, Event, KeyCode},
@@ -11,6 +12,7 @@ use crossterm::{
     terminal::{disable_raw_mode, enable_raw_mode},
     Result,
 };
+use std::time::Duration;
 
 const HELP: &str = r#"Blocking read()
  - Keyboard, mouse and terminal resize events enabled
@@ -29,6 +31,11 @@ fn print_events() -> Result<()> {
             println!("Cursor position: {:?}\r", position());
         }
 
+        if let Event::Resize(_, _) = event {
+            let (original_size, new_size) = flush_resize_events(event);
+            println!("Resize from: {:?}, to: {:?}", original_size, new_size);
+        }
+
         if event == Event::Key(KeyCode::Esc.into()) {
             break;
         }
@@ -37,6 +44,27 @@ fn print_events() -> Result<()> {
     Ok(())
 }
 
+// Resize events can occur in batches.
+// With a simple loop they can be flushed.
+// This function will keep the first and last resize event.
+fn flush_resize_events(event: Event) -> ((u16, u16), (u16, u16)) {
+    if let Event::Resize(x, y) = event {
+        let mut last_resize = (x, y);
+        loop {
+            if let Ok(true) = poll(Duration::from_millis(50)) {
+                if let Ok(Event::Resize(x, y)) = read() {
+                    last_resize = (x, y);
+                }
+            } else {
+                break;
+            }
+        }
+
+        return ((x, y), last_resize);
+    }
+    ((0, 0), (0, 0))
+}
+
 fn main() -> Result<()> {
     println!("{}", HELP);
 

src/event.rs

@@ -15,6 +15,8 @@
 //! * use the [`read`](fn.read.html) & [`poll`](fn.poll.html) functions on any, but same, thread
 //! * or the [`EventStream`](struct.EventStream.html).
 //!
+//! **Make sure to enable raw mode in order for keyboard events to work properly**
+//!
 //! ## Mouse Events
 //!
 //! Mouse events are not enabled by default. You have to enable them with the
@@ -273,6 +275,7 @@ pub enum Event {
     /// A single mouse event with additional pressed modifiers.
     Mouse(MouseEvent),
     /// An resize event with new dimensions after resize (columns, rows).
+    /// **Note** that resize events can be occur in batches.
     Resize(u16, u16),
 }
 

src/event/source/windows.rs

@@ -34,7 +34,8 @@ impl EventSource for WindowsEventSource {
 
         loop {
             if let Some(event_ready) = self.poll.poll(poll_timeout.leftover())? {
-                if event_ready && self.console.number_of_console_input_events()? != 0 {
+                let number = self.console.number_of_console_input_events()?;
+                if event_ready && number != 0 {
                     let event = match self.console.read_single_input_event()? {
                         InputRecord::KeyEvent(record) => handle_key_event(record)?,
                         InputRecord::MouseEvent(record) => handle_mouse_event(record)?,