patch 8.0.1211: cannot reorder tab pages with drag & drop
Problem: Cannot reorder tab pages with drag & drop.
Solution: Support drag & drop for GTK and MS-Windows. (Ken Takata, Masamichi
Abe)
diff --git a/src/gui_w32.c b/src/gui_w32.c
index c5564cd..64acc76 100644
--- a/src/gui_w32.c
+++ b/src/gui_w32.c
@@ -8151,6 +8151,34 @@
# endif
}
+/*
+ * Get tabpage_T from POINT.
+ */
+ static tabpage_T *
+GetTabFromPoint(
+ HWND hWnd,
+ POINT pt)
+{
+ tabpage_T *ptp = NULL;
+
+ if (gui_mch_showing_tabline())
+ {
+ TCHITTESTINFO htinfo;
+ htinfo.pt = pt;
+ /* ignore if a window under cusor is not tabcontrol. */
+ if (s_tabhwnd == hWnd)
+ {
+ int idx = TabCtrl_HitTest(s_tabhwnd, &htinfo);
+ if (idx != -1)
+ ptp = find_tabpage(idx + 1);
+ }
+ }
+ return ptp;
+}
+
+static POINT s_pt = {0, 0};
+static HCURSOR s_hCursor = NULL;
+
static LRESULT CALLBACK
tabline_wndproc(
HWND hwnd,
@@ -8158,7 +8186,73 @@
WPARAM wParam,
LPARAM lParam)
{
+ POINT pt;
+ tabpage_T *tp;
+ RECT rect;
+ int nCenter;
+ int idx0;
+ int idx1;
+
HandleMouseHide(uMsg, lParam);
+
+ switch (uMsg)
+ {
+ case WM_LBUTTONDOWN:
+ {
+ s_pt.x = GET_X_LPARAM(lParam);
+ s_pt.y = GET_Y_LPARAM(lParam);
+ SetCapture(hwnd);
+ s_hCursor = GetCursor(); /* backup default cursor */
+ break;
+ }
+ case WM_MOUSEMOVE:
+ if (GetCapture() == hwnd
+ && ((wParam & MK_LBUTTON)) != 0)
+ {
+ pt.x = GET_X_LPARAM(lParam);
+ pt.y = s_pt.y;
+ if (abs(pt.x - s_pt.x) > GetSystemMetrics(SM_CXDRAG))
+ {
+ SetCursor(LoadCursor(NULL, IDC_SIZEWE));
+
+ tp = GetTabFromPoint(hwnd, pt);
+ if (tp != NULL)
+ {
+ idx0 = tabpage_index(curtab) - 1;
+ idx1 = tabpage_index(tp) - 1;
+
+ TabCtrl_GetItemRect(hwnd, idx1, &rect);
+ nCenter = rect.left + (rect.right - rect.left) / 2;
+
+ /* Check if the mouse cursor goes over the center of
+ * the next tab to prevent "flickering". */
+ if ((idx0 < idx1) && (nCenter < pt.x))
+ {
+ tabpage_move(idx1 + 1);
+ update_screen(0);
+ }
+ else if ((idx1 < idx0) && (pt.x < nCenter))
+ {
+ tabpage_move(idx1);
+ update_screen(0);
+ }
+ }
+ }
+ }
+ break;
+ case WM_LBUTTONUP:
+ {
+ if (GetCapture() == hwnd)
+ {
+ SetCursor(s_hCursor);
+ ReleaseCapture();
+ }
+ break;
+ }
+ default:
+ break;
+ }
+
return CallWindowProc(s_tabline_wndproc, hwnd, uMsg, wParam, lParam);
}
#endif