Alex Villacís Lasso : richedit: Private movement of cursors in text insertion should not cause WM_NOTIFY to be sent .

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 829940458f11bc74f4fefca5cb200ad9abd17951
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=829940458f11bc74f4fefca5cb200ad9abd17951

Author: Alex Villacís Lasso <a_villacis at palosanto.com>
Date:   Sun Apr 27 15:47:26 2008 -0500

richedit: Private movement of cursors in text insertion should not cause WM_NOTIFY to be sent.

As text is inserted, the cursor is moved to the end, and then back to
offset 0. A reordering of operations prevents a WM_NOTIFY from being
sent on cursor being moved to the end, and another by being moved
back to the beginning. If the cursor was not at offset 0, then
exactly one WM_NOTIFY must be sent, for the movement from previous
position to the beginning.  With tests to prove this change and the
previous one (modify flag should be off on WM_SETTEXT-caused
WM_NOTIFY).

---

 dlls/riched20/editor.c       |    2 +-
 dlls/riched20/tests/editor.c |   79 +++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 79 insertions(+), 2 deletions(-)

diff --git a/dlls/riched20/editor.c b/dlls/riched20/editor.c
index b153fc1..392a60a 100644
--- a/dlls/riched20/editor.c
+++ b/dlls/riched20/editor.c
@@ -2436,10 +2436,10 @@ static LRESULT RichEditWndProc_common(HWND hWnd, UINT msg, WPARAM wParam,
     }
     else
       TRACE("WM_SETTEXT - NULL\n");
+    ME_SetSelection(editor, 0, 0);
     editor->nModifyStep = 0;
     ME_CommitUndo(editor);
     ME_EmptyUndoStack(editor);
-    ME_SetSelection(editor, 0, 0);
     ME_UpdateRepaint(editor);
     return 1;
   }
diff --git a/dlls/riched20/tests/editor.c b/dlls/riched20/tests/editor.c
index 05db7f8..891c713 100644
--- a/dlls/riched20/tests/editor.c
+++ b/dlls/riched20/tests/editor.c
@@ -3125,6 +3125,83 @@ static void test_eventMask(void)
 
 }
 
+static int received_WM_NOTIFY = 0;
+static int modify_at_WM_NOTIFY = 0;
+static HWND hwndRichedit_WM_NOTIFY;
+
+static LRESULT WINAPI WM_NOTIFY_ParentMsgCheckProcA(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+    if(message == WM_NOTIFY)
+    {
+      received_WM_NOTIFY = 1;
+      modify_at_WM_NOTIFY = SendMessage(hwndRichedit_WM_NOTIFY, EM_GETMODIFY, 0, 0);
+    }
+    return DefWindowProcA(hwnd, message, wParam, lParam);
+}
+
+static void test_WM_NOTIFY(void)
+{
+    HWND parent;
+    WNDCLASSA cls;
+    CHARFORMAT2 cf2;
+
+    /* register class to capture WM_NOTIFY */
+    cls.style = 0;
+    cls.lpfnWndProc = WM_NOTIFY_ParentMsgCheckProcA;
+    cls.cbClsExtra = 0;
+    cls.cbWndExtra = 0;
+    cls.hInstance = GetModuleHandleA(0);
+    cls.hIcon = 0;
+    cls.hCursor = LoadCursorA(0, (LPSTR)IDC_ARROW);
+    cls.hbrBackground = GetStockObject(WHITE_BRUSH);
+    cls.lpszMenuName = NULL;
+    cls.lpszClassName = "WM_NOTIFY_ParentClass";
+    if(!RegisterClassA(&cls)) assert(0);
+
+    parent = CreateWindow(cls.lpszClassName, NULL, WS_POPUP|WS_VISIBLE,
+                          0, 0, 200, 60, NULL, NULL, NULL, NULL);
+    ok (parent != 0, "Failed to create parent window\n");
+
+    hwndRichedit_WM_NOTIFY = new_richedit(parent);
+    ok(hwndRichedit_WM_NOTIFY != 0, "Failed to create edit window\n");
+
+    SendMessage(hwndRichedit_WM_NOTIFY, EM_SETEVENTMASK, 0, ENM_SELCHANGE);
+
+    /* Notifications for selection change should only be sent when selection
+       actually changes. EM_SETCHARFORMAT is one message that calls
+       ME_CommitUndo, which should check whether message should be sent */
+    received_WM_NOTIFY = 0;
+    cf2.cbSize = sizeof(CHARFORMAT2);
+    SendMessage(hwndRichedit_WM_NOTIFY, EM_GETCHARFORMAT, (WPARAM) SCF_DEFAULT,
+             (LPARAM) &cf2);
+    cf2.dwMask = CFM_ITALIC | cf2.dwMask;
+    cf2.dwEffects = CFE_ITALIC ^ cf2.dwEffects;
+    SendMessage(hwndRichedit_WM_NOTIFY, EM_SETCHARFORMAT, 0, (LPARAM) &cf2);
+    ok(received_WM_NOTIFY == 0, "Unexpected WM_NOTIFY was sent!\n");
+
+    /* WM_SETTEXT should NOT cause a WM_NOTIFY to be sent when selection is
+       already at 0. */
+    received_WM_NOTIFY = 0;
+    modify_at_WM_NOTIFY = 0;
+    SendMessage(hwndRichedit_WM_NOTIFY, WM_SETTEXT, 0, (LPARAM)"sometext");
+    ok(received_WM_NOTIFY == 0, "Unexpected WM_NOTIFY was sent!\n");
+    ok(modify_at_WM_NOTIFY == 0, "WM_NOTIFY callback saw text flagged as modified!\n");
+
+    received_WM_NOTIFY = 0;
+    modify_at_WM_NOTIFY = 0;
+    SendMessage(hwndRichedit_WM_NOTIFY, EM_SETSEL, 4, 4);
+    ok(received_WM_NOTIFY == 1, "Expected WM_NOTIFY was NOT sent!\n");
+
+    received_WM_NOTIFY = 0;
+    modify_at_WM_NOTIFY = 0;
+    SendMessage(hwndRichedit_WM_NOTIFY, WM_SETTEXT, 0, (LPARAM)"sometext");
+    ok(received_WM_NOTIFY == 1, "Expected WM_NOTIFY was NOT sent!\n");
+    ok(modify_at_WM_NOTIFY == 0, "WM_NOTIFY callback saw text flagged as modified!\n");
+
+    DestroyWindow(hwndRichedit_WM_NOTIFY);
+    DestroyWindow(parent);
+}
+
 START_TEST( editor )
 {
   MSG msg;
@@ -3134,7 +3211,6 @@ START_TEST( editor )
    * RICHED20.DLL, so the linker doesn't actually link to it. */
   hmoduleRichEdit = LoadLibrary("RICHED20.DLL");
   ok(hmoduleRichEdit != NULL, "error: %d\n", (int) GetLastError());
-
   test_WM_CHAR();
   test_EM_FINDTEXT();
   test_EM_GETLINE();
@@ -3168,6 +3244,7 @@ START_TEST( editor )
   test_EM_GETTEXTLENGTHEX();
   test_EM_REPLACESEL(1);
   test_EM_REPLACESEL(0);
+  test_WM_NOTIFY();
   test_eventMask();
 
   /* Set the environment variable WINETEST_RICHED20 to keep windows