From 59360f770cd50bc1a5c67c2c8dff65bc0169fa99 Mon Sep 17 00:00:00 2001
From: Ryan Fleury <ryan.j.fleury@gmail.com>
Date: Tue, 27 Aug 2024 14:49:57 -0700
Subject: [PATCH] file drop support

---
 src/df/gfx/df_gfx.c             | 23 ++++++++++++++++++++++-
 src/os/gfx/win32/os_gfx_win32.c | 25 +++++++++++++++++++++++--
 src/ui/ui_core.h                |  2 ++
 3 files changed, 47 insertions(+), 3 deletions(-)

diff --git a/src/df/gfx/df_gfx.c b/src/df/gfx/df_gfx.c
index 3999125b..f258c7c9 100644
--- a/src/df/gfx/df_gfx.c
+++ b/src/df/gfx/df_gfx.c
@@ -1341,12 +1341,14 @@ df_window_update_and_render(Arena *arena, DF_Window *ws, DF_CmdList *cmds)
                 case OS_EventKind_MouseMove: {kind = UI_EventKind_MouseMove;}break;
                 case OS_EventKind_Text:      {kind = UI_EventKind_Text;}break;
                 case OS_EventKind_Scroll:    {kind = UI_EventKind_Scroll;}break;
+                case OS_EventKind_FileDrop:  {kind = UI_EventKind_FileDrop;}break;
               }
             }
             ui_event.kind         = kind;
             ui_event.key          = os_event->key;
             ui_event.modifiers    = os_event->flags;
             ui_event.string       = os_event->character ? str8_from_32(ui_build_arena(), str32(&os_event->character, 1)) : str8_zero();
+            ui_event.paths        = str8_list_copy(ui_build_arena(), &os_event->strings);
             ui_event.pos          = os_event->pos;
             ui_event.delta_2f32   = os_event->delta;
             ui_event.timestamp_us = os_event->timestamp_us;
@@ -7377,7 +7379,7 @@ df_window_update_and_render(Arena *arena, DF_Window *ws, DF_CmdList *cmds)
               }
             }
           }
-          if((view->query_string_size != 0 || view->is_filtering) && ui_is_focus_active() && ui_slot_press(UI_EventActionSlot_Cancel))
+          if(view->spec->info.flags & DF_ViewSpecFlag_CanFilter && (view->query_string_size != 0 || view->is_filtering) && ui_is_focus_active() && ui_slot_press(UI_EventActionSlot_Cancel))
           {
             DF_CmdParams p = df_cmd_params_from_view(ws, panel, view);
             df_push_cmd__root(&p, df_cmd_spec_from_core_cmd_kind(DF_CoreCmdKind_ClearFilter));
@@ -7789,6 +7791,25 @@ df_window_update_and_render(Arena *arena, DF_Window *ws, DF_CmdList *cmds)
             }
           }
         }
+        
+        //////////////////////////
+        //- rjf: accept file drops
+        //
+        for(UI_Event *evt = 0; ui_next_event(&evt);)
+        {
+          if(evt->kind == UI_EventKind_FileDrop && contains_2f32(content_rect, evt->pos))
+          {
+            for(String8Node *n = evt->paths.first; n != 0; n = n->next)
+            {
+              Temp scratch = scratch_begin(0, 0);
+              DF_CmdParams p = df_cmd_params_from_panel(ws, panel);
+              p.file_path = path_normalized_from_string(scratch.arena, n->string);
+              df_push_cmd__root(&p, df_cmd_spec_from_core_cmd_kind(DF_CoreCmdKind_Open));
+              scratch_end(scratch);
+            }
+            ui_eat_event(evt);
+          }
+        }
       }
     }
     
diff --git a/src/os/gfx/win32/os_gfx_win32.c b/src/os/gfx/win32/os_gfx_win32.c
index e53e951e..cd1cb87e 100644
--- a/src/os/gfx/win32/os_gfx_win32.c
+++ b/src/os/gfx/win32/os_gfx_win32.c
@@ -540,7 +540,27 @@ os_w32_wnd_proc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
         F32 new_dpi = (F32)(wParam & 0xffff);
         window->dpi = new_dpi;
       }break;
-      
+      
+      //- rjf: [file drop]
+      case WM_DROPFILES:
+      {
+        HDROP drop = (HDROP)wParam;
+        POINT drop_pt = {0};
+        DragQueryPoint(drop, &drop_pt);
+        ScreenToClient(window->hwnd, &drop_pt);
+        U64 num_files_dropped = DragQueryFile(drop, 0xffffffff, 0, 0);
+        OS_Event *event = os_w32_push_event(OS_EventKind_FileDrop, window);
+        event->pos = v2f32((F32)drop_pt.x, (F32)drop_pt.y);
+        for(U64 idx = 0; idx < num_files_dropped; idx += 1)
+        {
+          U64 name_size = DragQueryFile(drop, idx, 0, 0) + 1;
+          U8 *name_ptr = push_array(os_w32_event_arena, U8, name_size);
+          DragQueryFile(drop, idx, name_ptr, name_size);
+          str8_list_push(os_w32_event_arena, &event->strings, str8(name_ptr, name_size));
+        }
+        DragFinish(drop);
+      }break;
+      
       //- rjf: [custom border]
       case WM_NCPAINT:
       {
@@ -1014,7 +1034,8 @@ os_window_open(Vec2F32 resolution, OS_WindowFlags flags, String8 title)
                            (int)resolution.y,
                            0, 0,
                            os_w32_gfx_state->hInstance,
-                           0);
+                           0);
+    DragAcceptFiles(hwnd, 1);
     scratch_end(scratch);
   }
   
diff --git a/src/ui/ui_core.h b/src/ui/ui_core.h
index 2ba93d9b..a3a23d91 100644
--- a/src/ui/ui_core.h
+++ b/src/ui/ui_core.h
@@ -91,6 +91,7 @@ typedef enum UI_EventKind
   UI_EventKind_MouseMove,
   UI_EventKind_Scroll,
   UI_EventKind_AutocompleteHint,
+  UI_EventKind_FileDrop,
   UI_EventKind_COUNT
 }
 UI_EventKind;
@@ -141,6 +142,7 @@ struct UI_Event
   OS_Key key;
   OS_EventFlags modifiers;
   String8 string;
+  String8List paths;
   Vec2F32 pos;
   Vec2F32 delta_2f32;
   Vec2S32 delta_2s32;