Handle TextInput event

Author: maximecb

api/syscalls.json

@@ -415,6 +415,11 @@
         "u16",
         5
       ],
+      [
+        "EVENT_TEXTINPUT",
+        "u16",
+        6
+      ],
       [
         "KEY_BACKSPACE",
         "u16",

doc/syscalls.md

@@ -225,6 +225,7 @@ These are the constants associated with the window subsystem:
 - `u16 EVENT_MOUSEDOWN = 3`
 - `u16 EVENT_MOUSEUP = 4`
 - `u16 EVENT_MOUSEMOVE = 5`
+- `u16 EVENT_TEXTINPUT = 6`
 - `u16 KEY_BACKSPACE = 8`
 - `u16 KEY_TAB = 9`
 - `u16 KEY_RETURN = 10`

ncc/include/uvm/syscalls.h

@@ -119,6 +119,7 @@
 #define EVENT_MOUSEDOWN 3
 #define EVENT_MOUSEUP 4
 #define EVENT_MOUSEMOVE 5
+#define EVENT_TEXTINPUT 6
 #define KEY_BACKSPACE 8
 #define KEY_TAB 9
 #define KEY_RETURN 10

ncc/include/uvm/window.h

@@ -12,6 +12,7 @@ typedef struct
     u16 button;
     i32 x;
     i32 y;
+    char text[64];
 } Event;
 
 // Stack allocation of structs not yet supported

vm/src/constants.rs

@@ -83,6 +83,7 @@ pub const EVENT_KEYUP: u16 = 2;
 pub const EVENT_MOUSEDOWN: u16 = 3;
 pub const EVENT_MOUSEUP: u16 = 4;
 pub const EVENT_MOUSEMOVE: u16 = 5;
+pub const EVENT_TEXTINPUT: u16 = 6;
 pub const KEY_BACKSPACE: u16 = 8;
 pub const KEY_TAB: u16 = 9;
 pub const KEY_RETURN: u16 = 10;

vm/src/window.rs

@@ -156,6 +156,8 @@ pub fn window_draw_frame(thread: &mut Thread, window_id: Value, src_addr: Value)
     window.canvas.present();
 }
 
+const EVENT_TEXT_MAX_BYTES: usize = 64;
+
 // C event struct
 #[repr(C)]
 struct CEvent
@@ -166,6 +168,7 @@ struct CEvent
     button: u16,
     x: i32,
     y: i32,
+    text: [u8; EVENT_TEXT_MAX_BYTES],
 }
 
 /// Takes a pointer ot an event struct to write into
@@ -281,16 +284,24 @@ fn translate_event(sdl_event: Event, c_event: &mut CEvent) -> bool
             true
         }
 
-        /*
         Event::TextInput { window_id, text, .. } => {
+            c_event.kind = EVENT_TEXTINPUT;
+            c_event.window_id = 0;
+
+            let text_bytes = text.bytes();
+
+            // This should never happen
+            if text_bytes.len() > EVENT_TEXT_MAX_BYTES {
+                panic!();
+            }
+
             // For each UTF-8 byte of input
-            for ch in text.bytes() {
-                if let ExitReason::Exit(val) = window_call_textinput(vm, window_id, ch) {
-                    return ExitReason::Exit(val);
-                }
+            for (i, ch) in text_bytes.enumerate() {
+                c_event.text[i] = ch;
             }
+
+            true
         }
-        */
 
         _ => false
     }