From 3427308c607f9156a958cedd8ba4f101ae293e4d Mon Sep 17 00:00:00 2001
From: Dylan Ede <dylanede@googlemail.com>
Date: Mon, 3 Aug 2015 15:54:56 +0100
Subject: Modified Windows key event handling to support modifier keys.

---
 src/api/win32/callback.rs |  6 ++----
 src/api/win32/event.rs    | 27 +++++++++++++++++++++------
 2 files changed, 23 insertions(+), 10 deletions(-)

(limited to 'src/api')

diff --git a/src/api/win32/callback.rs b/src/api/win32/callback.rs
index 5667ca8..c6e7763 100644
--- a/src/api/win32/callback.rs
+++ b/src/api/win32/callback.rs
@@ -129,8 +129,7 @@ pub unsafe extern "system" fn callback(window: winapi::HWND, msg: winapi::UINT,
         winapi::WM_KEYDOWN => {
             use events::Event::KeyboardInput;
             use events::ElementState::Pressed;
-            let scancode = ((lparam >> 16) & 0xff) as u8;
-            let vkey = event::vkeycode_to_element(wparam);
+            let (scancode, vkey) = event::vkeycode_to_element(wparam, lparam);
             send_event(window, KeyboardInput(Pressed, scancode, vkey));
             0
         },
@@ -138,8 +137,7 @@ pub unsafe extern "system" fn callback(window: winapi::HWND, msg: winapi::UINT,
         winapi::WM_KEYUP => {
             use events::Event::KeyboardInput;
             use events::ElementState::Released;
-            let scancode = ((lparam >> 16) & 0xff) as u8;
-            let vkey = event::vkeycode_to_element(wparam);
+            let (scancode, vkey) = event::vkeycode_to_element(wparam, lparam);
             send_event(window, KeyboardInput(Released, scancode, vkey));
             0
         },
diff --git a/src/api/win32/event.rs b/src/api/win32/event.rs
index 6fbde81..ad4598a 100644
--- a/src/api/win32/event.rs
+++ b/src/api/win32/event.rs
@@ -1,8 +1,20 @@
 use events::VirtualKeyCode;
 use winapi;
+use user32;
+use ScanCode;
 
-pub fn vkeycode_to_element(code: winapi::WPARAM) -> Option<VirtualKeyCode> {
-    match code as i32 {
+const MAPVK_VSC_TO_VK_EX: u32 = 3;
+
+pub fn vkeycode_to_element(wparam: winapi::WPARAM, lparam: winapi::LPARAM) -> (ScanCode, Option<VirtualKeyCode>) {
+    let scancode = ((lparam >> 16) & 0xff) as u8;
+    let extended = (lparam & 0x01000000) != 0;
+    let vk = match wparam as i32 {
+        winapi::VK_SHIFT => unsafe { user32::MapVirtualKeyA(scancode as u32, MAPVK_VSC_TO_VK_EX) as i32 },
+        winapi::VK_CONTROL => if extended { winapi::VK_RCONTROL } else { winapi::VK_LCONTROL },
+        winapi::VK_MENU => if extended { winapi::VK_RMENU } else { winapi::VK_LMENU },
+        other => other
+    };
+    (scancode, match vk {
         //winapi::VK_LBUTTON => Some(VirtualKeyCode::Lbutton),
         //winapi::VK_RBUTTON => Some(VirtualKeyCode::Rbutton),
         //winapi::VK_CANCEL => Some(VirtualKeyCode::Cancel),
@@ -13,9 +25,12 @@ pub fn vkeycode_to_element(code: winapi::WPARAM) -> Option<VirtualKeyCode> {
         winapi::VK_TAB => Some(VirtualKeyCode::Tab),
         //winapi::VK_CLEAR => Some(VirtualKeyCode::Clear),
         winapi::VK_RETURN => Some(VirtualKeyCode::Return),
-        //winapi::VK_SHIFT => Some(VirtualKeyCode::Shift),
-        //winapi::VK_CONTROL => Some(VirtualKeyCode::Control),
-        //winapi::VK_MENU => Some(VirtualKeyCode::Menu),
+        winapi::VK_LSHIFT => Some(VirtualKeyCode::LShift),
+        winapi::VK_RSHIFT => Some(VirtualKeyCode::RShift),
+        winapi::VK_LCONTROL => Some(VirtualKeyCode::LControl),
+        winapi::VK_RCONTROL => Some(VirtualKeyCode::RControl),
+        winapi::VK_LMENU => Some(VirtualKeyCode::LMenu),
+        winapi::VK_RMENU => Some(VirtualKeyCode::RMenu),
         winapi::VK_PAUSE => Some(VirtualKeyCode::Pause),
         winapi::VK_CAPITAL => Some(VirtualKeyCode::Capital),
         winapi::VK_KANA => Some(VirtualKeyCode::Kana),
@@ -177,5 +192,5 @@ pub fn vkeycode_to_element(code: winapi::WPARAM) -> Option<VirtualKeyCode> {
         winapi::VK_PA1 => Some(VirtualKeyCode::Pa1),
         winapi::VK_OEM_CLEAR => Some(VirtualKeyCode::Oem_clear),*/
         _ => None
-    }
+    })
 }
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