From 826931e2c2e61ec7815d25ec33618bfe4aacff0d Mon Sep 17 00:00:00 2001
From: "Denilson M. Amorim" <dma_2012@hotmail.com>
Date: Tue, 23 Jun 2015 19:05:37 -0300
Subject: DroppedFile event for Win32

---
 Cargo.toml                |  3 +++
 src/api/win32/callback.rs | 22 ++++++++++++++++++++++
 src/api/win32/init.rs     |  3 ++-
 src/events.rs             |  7 ++++++-
 src/lib.rs                |  2 ++
 5 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 146cd46..14d7faa 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -39,6 +39,7 @@ core-graphics = "0"
 
 [target.i686-pc-windows-gnu.dependencies]
 winapi = "~0.1.18"
+shell32-sys = "0.1"
 gdi32-sys = "0.1"
 user32-sys = "~0.1.1"
 kernel32-sys = "0.1"
@@ -46,6 +47,7 @@ dwmapi-sys = "0.1"
 
 [target.x86_64-pc-windows-gnu.dependencies]
 winapi = "~0.1.18"
+shell32-sys = "0.1"
 gdi32-sys = "0.1"
 user32-sys = "~0.1.1"
 kernel32-sys = "0.1"
@@ -53,6 +55,7 @@ dwmapi-sys = "0.1"
 
 [target.x86_64-pc-windows-msvc.dependencies]
 winapi = "~0.1.18"
+shell32-sys = "0.1"
 gdi32-sys = "0.1"
 user32-sys = "~0.1.1"
 kernel32-sys = "0.1"
diff --git a/src/api/win32/callback.rs b/src/api/win32/callback.rs
index 6ac56f3..25beb7b 100644
--- a/src/api/win32/callback.rs
+++ b/src/api/win32/callback.rs
@@ -3,12 +3,15 @@ use std::ptr;
 use std::cell::RefCell;
 use std::sync::mpsc::Sender;
 use std::sync::{Arc, Mutex};
+use std::ffi::OsString;
+use std::os::windows::ffi::OsStringExt;
 
 use CursorState;
 use Event;
 use super::event;
 
 use user32;
+use shell32;
 use winapi;
 
 /// There's no parameters passed to the callback function, so it needs to get
@@ -249,6 +252,25 @@ pub unsafe extern "system" fn callback(window: winapi::HWND, msg: winapi::UINT,
             0
         },
 
+        winapi::WM_DROPFILES => {
+            use events::Event::DroppedFile;
+
+            let hdrop = wparam as winapi::HDROP;
+            let mut pathbuf: [u16; winapi::MAX_PATH] = unsafe { mem::uninitialized() };
+            let num_drops = shell32::DragQueryFileW(hdrop, 0xFFFFFFFF, ptr::null_mut(), 0);
+
+            for i in 0..num_drops {
+                let nch = shell32::DragQueryFileW(hdrop, i, pathbuf.as_mut_ptr(),
+                                                  winapi::MAX_PATH as u32) as usize;
+                if nch > 0 {
+                    send_event(window, DroppedFile(OsString::from_wide(&pathbuf[0..nch]).into()));
+                }
+            }
+
+            shell32::DragFinish(hdrop);
+            0
+        },
+
         _ => {
             user32::DefWindowProcW(window, msg, wparam, lparam)
         }
diff --git a/src/api/win32/init.rs b/src/api/win32/init.rs
index 7cb5433..cc6d2d2 100644
--- a/src/api/win32/init.rs
+++ b/src/api/win32/init.rs
@@ -133,7 +133,8 @@ unsafe fn init(title: Vec<u16>, builder: BuilderAttribs<'static>,
             style | winapi::WS_VISIBLE
         };
 
-        let handle = user32::CreateWindowExW(ex_style, class_name.as_ptr(),
+        let handle = user32::CreateWindowExW(ex_style | winapi::WS_EX_ACCEPTFILES,
+            class_name.as_ptr(),
             title.as_ptr() as winapi::LPCWSTR,
             style | winapi::WS_CLIPSIBLINGS | winapi::WS_CLIPCHILDREN,
             x.unwrap_or(winapi::CW_USEDEFAULT), y.unwrap_or(winapi::CW_USEDEFAULT),
diff --git a/src/events.rs b/src/events.rs
index c175810..ef2c61d 100644
--- a/src/events.rs
+++ b/src/events.rs
@@ -1,4 +1,6 @@
-#[derive(Clone, Debug, Copy)]
+use std::path::PathBuf;
+
+#[derive(Clone, Debug)]
 pub enum Event {
     /// The size of the window has changed.
     Resized(u32, u32),
@@ -9,6 +11,9 @@ pub enum Event {
     /// The window has been closed.
     Closed,
 
+    /// A file has been dropped into the window.
+    DroppedFile(PathBuf),
+
     /// The window received a unicode character.
     ReceivedCharacter(char),
 
diff --git a/src/lib.rs b/src/lib.rs
index 068b9b8..928966f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -37,6 +37,8 @@ extern crate winapi;
 #[cfg(target_os = "windows")]
 extern crate kernel32;
 #[cfg(target_os = "windows")]
+extern crate shell32;
+#[cfg(target_os = "windows")]
 extern crate gdi32;
 #[cfg(target_os = "windows")]
 extern crate user32;
-- 
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