From fed7ee70a662f7c44a7d8faa3b00dd74bc6d5f03 Mon Sep 17 00:00:00 2001
From: Katayama Hirofumi MZ <katayama.hirofumi.mz@gmail.com>
Date: Sat, 16 Dec 2023 20:46:40 +0900
Subject: [PATCH] [SHIMGVW] Enable middle button dragging (#6173)

---
 dll/win32/shimgvw/CMakeLists.txt   |   3 ++
 dll/win32/shimgvw/res/handdrag.cur | Bin 0 -> 326 bytes
 dll/win32/shimgvw/resource.h       |   3 ++
 dll/win32/shimgvw/shimgvw.c        |  70 ++++++++++++++++++++++++++++-
 dll/win32/shimgvw/shimgvw.rc       |   2 +
 5 files changed, 76 insertions(+), 2 deletions(-)
 create mode 100644 dll/win32/shimgvw/res/handdrag.cur

diff --git a/dll/win32/shimgvw/CMakeLists.txt b/dll/win32/shimgvw/CMakeLists.txt
index 3c2f5a1f3c3..1a4589abd43 100644
--- a/dll/win32/shimgvw/CMakeLists.txt
+++ b/dll/win32/shimgvw/CMakeLists.txt
@@ -9,6 +9,9 @@ list(APPEND SOURCE
     ${CMAKE_CURRENT_BINARY_DIR}/shimgvw_stubs.c
     ${CMAKE_CURRENT_BINARY_DIR}/shimgvw.def)
 
+file(GLOB_RECURSE shimgvw_rc_deps res/*.*)
+add_rc_deps(shimgvw.rc ${shimgvw_rc_deps})
+
 add_library(shimgvw MODULE ${SOURCE})
 set_module_type(shimgvw win32dll UNICODE)
 target_link_libraries(shimgvw wine)
diff --git a/dll/win32/shimgvw/res/handdrag.cur b/dll/win32/shimgvw/res/handdrag.cur
new file mode 100644
index 0000000000000000000000000000000000000000..74e5ba6b9c2b8e84d7696ce289ed5ba5296f4efa
GIT binary patch
literal 326
zcmZ|Ku?@m75CzchP*9;z(c+Sl4Z<jFl5D^#RMc$13fX{Eh$8amf5#C8<W5g_vTWTM
zs1Oh%uvH!dumf-q9pNNFnWGf<RpFkb%W~8Mu(vnR*a)=6GXal;V3${h%?)2y^|MaP
q$e+*-%h9jNyRFF1f;OILI!)VfjFWWMm-?CR`F&QCLqn$aXVwRWT70Dd

literal 0
HcmV?d00001

diff --git a/dll/win32/shimgvw/resource.h b/dll/win32/shimgvw/resource.h
index 68f91679139..96da8e444cf 100644
--- a/dll/win32/shimgvw/resource.h
+++ b/dll/win32/shimgvw/resource.h
@@ -7,6 +7,9 @@
 #define IDI_JPG_ICON 4
 #define IDI_PNG_ICON 5
 
+/* Cursors */
+#define IDC_HANDDRAG 100
+
 /* Toolbar images */
 #define IDB_PREV_PIC    50
 #define IDB_NEXT_PIC    51
diff --git a/dll/win32/shimgvw/shimgvw.c b/dll/win32/shimgvw/shimgvw.c
index b04363ed896..0503449d87c 100644
--- a/dll/win32/shimgvw/shimgvw.c
+++ b/dll/win32/shimgvw/shimgvw.c
@@ -103,6 +103,8 @@ typedef struct tagPREVIEW_DATA
     ANIME m_Anime; /* Animation */
     INT m_xScrollOffset;
     INT m_yScrollOffset;
+    UINT m_nMouseDownMsg;
+    POINT m_ptOrigin;
 } PREVIEW_DATA, *PPREVIEW_DATA;
 
 static inline PPREVIEW_DATA
@@ -885,9 +887,56 @@ Preview_EndSlideShow(HWND hwnd)
 static VOID
 ZoomWnd_OnButtonDown(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 {
+    PPREVIEW_DATA pData = Preview_GetData(hwnd);
     HWND hParent = GetParent(hwnd);
-    if (!Preview_IsMainWnd(hParent))
-        Preview_EndSlideShow(hParent);
+    if ((uMsg == WM_LBUTTONDOWN) || (uMsg == WM_RBUTTONDOWN))
+    {
+        if (!Preview_IsMainWnd(hParent))
+            Preview_EndSlideShow(hParent);
+        return;
+    }
+
+    pData->m_nMouseDownMsg = uMsg;
+    pData->m_ptOrigin.x = GET_X_LPARAM(lParam);
+    pData->m_ptOrigin.y = GET_Y_LPARAM(lParam);
+    SetCapture(hwnd);
+    SetCursor(LoadCursorW(g_hInstance, MAKEINTRESOURCEW(IDC_HANDDRAG)));
+}
+
+static VOID
+ZoomWnd_OnMouseMove(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
+{
+    PPREVIEW_DATA pData = Preview_GetData(hwnd);
+    POINT pt = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
+
+    if (pData->m_nMouseDownMsg == WM_MBUTTONDOWN)
+    {
+        INT x = GetScrollPos(hwnd, SB_HORZ) - (pt.x - pData->m_ptOrigin.x);
+        INT y = GetScrollPos(hwnd, SB_VERT) - (pt.y - pData->m_ptOrigin.y);
+        SendMessageW(hwnd, WM_HSCROLL, MAKEWPARAM(SB_THUMBPOSITION, x), 0);
+        SendMessageW(hwnd, WM_VSCROLL, MAKEWPARAM(SB_THUMBPOSITION, y), 0);
+        pData->m_ptOrigin = pt;
+    }
+}
+
+static BOOL
+ZoomWnd_OnSetCursor(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
+{
+    PPREVIEW_DATA pData = Preview_GetData(hwnd);
+    if (pData->m_nMouseDownMsg == WM_MBUTTONDOWN)
+    {
+        SetCursor(LoadCursorW(g_hInstance, MAKEINTRESOURCEW(IDC_HANDDRAG)));
+        return TRUE;
+    }
+    return FALSE;
+}
+
+static VOID
+ZoomWnd_OnButtonUp(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
+{
+    PPREVIEW_DATA pData = Preview_GetData(hwnd);
+    pData->m_nMouseDownMsg = 0;
+    ReleaseCapture();
 }
 
 static VOID
@@ -995,6 +1044,23 @@ ZoomWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
             ZoomWnd_OnButtonDown(hwnd, uMsg, wParam, lParam);
             break;
         }
+        case WM_MOUSEMOVE:
+        {
+            ZoomWnd_OnMouseMove(hwnd, uMsg, wParam, lParam);
+            break;
+        }
+        case WM_SETCURSOR:
+        {
+            if (!ZoomWnd_OnSetCursor(hwnd, uMsg, wParam, lParam))
+                return DefWindowProcW(hwnd, uMsg, wParam, lParam);
+        }
+        case WM_LBUTTONUP:
+        case WM_MBUTTONUP:
+        case WM_RBUTTONUP:
+        {
+            ZoomWnd_OnButtonUp(hwnd, uMsg, wParam, lParam);
+            break;
+        }
         case WM_PAINT:
         {
             ZoomWnd_OnPaint(pData, hwnd);
diff --git a/dll/win32/shimgvw/shimgvw.rc b/dll/win32/shimgvw/shimgvw.rc
index 58684a5d95b..f42c29154cd 100644
--- a/dll/win32/shimgvw/shimgvw.rc
+++ b/dll/win32/shimgvw/shimgvw.rc
@@ -17,6 +17,8 @@ IDI_APP_ICON ICON "res/main.ico"
 IDI_BMP_ICON ICON "res/bmp.ico"
 IDI_PNG_ICON ICON "res/png.ico"
 
+IDC_HANDDRAG CURSOR "res/handdrag.cur"
+
 IDB_PREV_PIC   BITMAP "res/prev.bmp"
 IDB_NEXT_PIC   BITMAP "res/next.bmp"
 IDB_BEST_FIT   BITMAP "res/best_fit.bmp"