From 524ba0c88c5ec88952d7f405b2062688e61ff5b8 Mon Sep 17 00:00:00 2001
From: Leighton Hancock <lastflux@gmail.com>
Date: Mon, 14 Nov 2016 16:50:58 +1300
Subject: [PATCH] Add file drop functionality

Adds the ability to drag and drop files from windows in order to attempt
to execute them
---
 src/xenia/app/emulator_window.cc | 13 +++++++++++++
 src/xenia/app/emulator_window.h  |  1 +
 src/xenia/ui/ui_event.h          | 12 ++++++++++++
 src/xenia/ui/window.cc           |  5 +++++
 src/xenia/ui/window.h            |  2 ++
 src/xenia/ui/window_listener.h   |  1 +
 src/xenia/ui/window_win.cc       | 17 +++++++++++++++++
 7 files changed, 51 insertions(+)

diff --git a/src/xenia/app/emulator_window.cc b/src/xenia/app/emulator_window.cc
index e32e99111..a7b4c55c9 100644
--- a/src/xenia/app/emulator_window.cc
+++ b/src/xenia/app/emulator_window.cc
@@ -32,6 +32,7 @@ using xe::ui::KeyEvent;
 using xe::ui::MenuItem;
 using xe::ui::MouseEvent;
 using xe::ui::UIEvent;
+using xe::ui::FileDropEvent;
 
 const std::wstring kBaseTitle = L"xenia";
 
@@ -81,6 +82,9 @@ bool EmulatorWindow::Initialize() {
   });
   loop_->on_quit.AddListener([this](UIEvent* e) { window_.reset(); });
 
+  window_->on_file_drop.AddListener(
+      [this](FileDropEvent* e) { FileDrop(e->filename()); });
+
   window_->on_key_down.AddListener([this](KeyEvent* e) {
     bool handled = true;
     switch (e->key_code()) {
@@ -257,6 +261,15 @@ bool EmulatorWindow::Initialize() {
   return true;
 }
 
+void EmulatorWindow::FileDrop(wchar_t* filename) {
+  std::wstring path = filename;
+  auto result = emulator_->LaunchPath(path);
+  if (XFAILED(result)) {
+    // TODO: Display a message box.
+    XELOGE("Failed to launch target: %.8X", result);
+  }
+}
+
 void EmulatorWindow::FileOpen() {
   std::wstring path;
 
diff --git a/src/xenia/app/emulator_window.h b/src/xenia/app/emulator_window.h
index 6a3b5e2e3..3d48279cb 100644
--- a/src/xenia/app/emulator_window.h
+++ b/src/xenia/app/emulator_window.h
@@ -42,6 +42,7 @@ class EmulatorWindow {
 
   bool Initialize();
 
+  void FileDrop(wchar_t* filename);
   void FileOpen();
   void CheckHideCursor();
   void CpuTimeScalarReset();
diff --git a/src/xenia/ui/ui_event.h b/src/xenia/ui/ui_event.h
index 0717e0fbe..156be1ece 100644
--- a/src/xenia/ui/ui_event.h
+++ b/src/xenia/ui/ui_event.h
@@ -26,6 +26,18 @@ class UIEvent {
   Window* target_ = nullptr;
 };
 
+class FileDropEvent : public UIEvent {
+ public:
+  FileDropEvent(Window* target, wchar_t* filename)
+      : UIEvent(target), filename_(filename) {}
+  ~FileDropEvent() override = default;
+
+  wchar_t* filename() const { return filename_; }
+
+ private:
+  wchar_t* filename_ = nullptr;
+};
+
 class KeyEvent : public UIEvent {
  public:
   KeyEvent(Window* target, int key_code, int repeat_count, bool prev_state)
diff --git a/src/xenia/ui/window.cc b/src/xenia/ui/window.cc
index 0a3c1993b..91f4a8f67 100644
--- a/src/xenia/ui/window.cc
+++ b/src/xenia/ui/window.cc
@@ -213,6 +213,11 @@ void Window::OnPaint(UIEvent* e) {
   }
 }
 
+void Window::OnFileDrop(FileDropEvent* e) {
+  on_file_drop(e);
+  ForEachListener([e](auto listener) { listener->OnFileDrop(e); });
+}
+
 void Window::OnVisible(UIEvent* e) {
   ForEachListener([e](auto listener) { listener->OnVisible(e); });
 }
diff --git a/src/xenia/ui/window.h b/src/xenia/ui/window.h
index eb14c9f89..107078be1 100644
--- a/src/xenia/ui/window.h
+++ b/src/xenia/ui/window.h
@@ -102,6 +102,7 @@ class Window {
   Delegate<UIEvent*> on_painting;
   Delegate<UIEvent*> on_paint;
   Delegate<UIEvent*> on_painted;
+  Delegate<FileDropEvent*> on_file_drop;
 
   Delegate<KeyEvent*> on_key_down;
   Delegate<KeyEvent*> on_key_up;
@@ -128,6 +129,7 @@ class Window {
   virtual void OnResize(UIEvent* e);
   virtual void OnLayout(UIEvent* e);
   virtual void OnPaint(UIEvent* e);
+  virtual void OnFileDrop(FileDropEvent* e);
 
   virtual void OnVisible(UIEvent* e);
   virtual void OnHidden(UIEvent* e);
diff --git a/src/xenia/ui/window_listener.h b/src/xenia/ui/window_listener.h
index 0f07435fb..08f7a5c7e 100644
--- a/src/xenia/ui/window_listener.h
+++ b/src/xenia/ui/window_listener.h
@@ -31,6 +31,7 @@ class WindowListener {
   virtual void OnPainting(UIEvent* e) {}
   virtual void OnPaint(UIEvent* e) {}
   virtual void OnPainted(UIEvent* e) {}
+  virtual void OnFileDrop(UIEvent* e) {}
 
   virtual void OnVisible(UIEvent* e) {}
   virtual void OnHidden(UIEvent* e) {}
diff --git a/src/xenia/ui/window_win.cc b/src/xenia/ui/window_win.cc
index 22b7bc2c1..b5deac2a3 100644
--- a/src/xenia/ui/window_win.cc
+++ b/src/xenia/ui/window_win.cc
@@ -101,6 +101,8 @@ bool Win32Window::OnCreate() {
 
   // Enable DWM elevation.
   EnableMMCSS();
+  // Enable file dragging from external sources
+  DragAcceptFiles(hwnd_, true);
 
   ShowWindow(hwnd_, SW_SHOWNORMAL);
   UpdateWindow(hwnd_);
@@ -378,6 +380,21 @@ LRESULT Win32Window::WndProc(HWND hWnd, UINT message, WPARAM wParam,
   }
 
   switch (message) {
+    case WM_DROPFILES: {
+      TCHAR lpszFile[MAX_PATH] = {0};
+      UINT uFiles = 0;
+      HDROP hDrop = (HDROP)wParam;
+      // Get number of files dropped
+      uFiles = DragQueryFile(hDrop, -1, NULL, NULL);
+
+      // Only getting first file dropped (other files ignored)
+      if (DragQueryFile(hDrop, 0, lpszFile, MAX_PATH)) {
+        auto e = FileDropEvent(this, lpszFile);
+        OnFileDrop(&e);
+      }
+
+      DragFinish(hDrop);
+    } break;
     case WM_NCCREATE:
       break;
     case WM_CREATE: