From 49de9d0290bcdbf6faab45f973c9dc64278934aa Mon Sep 17 00:00:00 2001
From: martinfouilleul <martinfouilleul@gmail.com>
Date: Tue, 23 May 2023 16:04:49 +0200
Subject: [PATCH] [win32] added basic mp_save_dialogue() implementation using
 COM IFileSaveDialog

---
 examples/ui/main.c |  8 ++++++--
 src/win32_app.c    | 40 +++++++++++++++++++++++++++++++++++++++-
 2 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/examples/ui/main.c b/examples/ui/main.c
index ed521fe..21701c1 100644
--- a/examples/ui/main.c
+++ b/examples/ui/main.c
@@ -406,8 +406,6 @@ int main()
 							             UI_STYLE_SIZE);
 							widget_view("Buttons")
 							{
-								ui_button("Button 1");
-
 								if(ui_button("Test Dialog").clicked)
 								{
 									char* options[] = {"Accept", "Reject"};
@@ -427,6 +425,12 @@ int main()
 									str8 file = mp_open_dialog(mem_scratch(), "Open File", 0, 0, 0, true);
 									printf("selected file %.*s\n", (int)file.len, file.ptr);
 								}
+
+								if(ui_button("Save").clicked)
+								{
+									str8 file = mp_save_dialog(mem_scratch(), "Save File", 0, 0, 0, true);
+									printf("selected file %.*s\n", (int)file.len, file.ptr);
+								}
 							}
 
 							ui_style_next(&(ui_style){.size.width = {UI_SIZE_PARENT, 0.5},
diff --git a/src/win32_app.c b/src/win32_app.c
index a0d9ff0..e30b4e0 100644
--- a/src/win32_app.c
+++ b/src/win32_app.c
@@ -1148,7 +1148,45 @@ MP_API str8 mp_save_dialog(mem_arena* arena,
                            const char* title,
                            const char* defaultPath,
                            int filterCount,
-                           const char** filters);
+                           const char** filters)
+{
+	str8 res = {0};
+	HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
+	if(SUCCEEDED(hr))
+	{
+		IFileOpenDialog* dialog = 0;
+		hr = CoCreateInstance(&CLSID_FileSaveDialog, NULL, CLSCTX_ALL, &IID_IFileSaveDialog, (void**)&dialog);
+		if(SUCCEEDED(hr))
+		{
+			hr = dialog->lpVtbl->Show(dialog, NULL);
+			if(SUCCEEDED(hr))
+			{
+				IShellItem* item;
+				hr = dialog->lpVtbl->GetResult(dialog, &item);
+				if(SUCCEEDED(hr))
+				{
+					PWSTR filePath;
+					hr = item->lpVtbl->GetDisplayName(item, SIGDN_FILESYSPATH, &filePath);
+
+					if(SUCCEEDED(hr))
+					{
+						int utf8Size = WideCharToMultiByte(CP_UTF8, 0, filePath, -1, NULL, 0, NULL, NULL);
+						if(utf8Size > 0)
+						{
+							res.ptr = mem_arena_alloc(arena, utf8Size);
+							res.len = utf8Size-1;
+							WideCharToMultiByte(CP_UTF8, 0, filePath, -1, res.ptr, utf8Size, NULL, NULL);
+						}
+						CoTaskMemFree(filePath);
+					}
+					item->lpVtbl->Release(item);
+				}
+			}
+		}
+	}
+	CoUninitialize();
+	return(res);
+}
 
 #include<commctrl.h>