riched20: Handle efficiently caret creation/destruction.

Signed-off-by: Sergio Gómez Del Real <sdelreal@codeweavers.com>
Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/riched20/caret.c

@@ -266,36 +266,47 @@ void ME_GetCursorCoordinates(ME_TextEditor *editor, ME_Cursor *pCursor,
   return;
 }
 
-
-void
-ME_MoveCaret(ME_TextEditor *editor)
+void create_caret(ME_TextEditor *editor)
 {
   int x, y, height;
 
   ME_GetCursorCoordinates(editor, &editor->pCursors[0], &x, &y, &height);
-  if(editor->bHaveFocus && !ME_IsSelection(editor))
+  ITextHost_TxCreateCaret(editor->texthost, NULL, 0, height);
+  editor->caret_height = height;
+  editor->caret_hidden = TRUE;
+}
+
+void show_caret(ME_TextEditor *editor)
+{
+  ITextHost_TxShowCaret(editor->texthost, TRUE);
+  editor->caret_hidden = FALSE;
+}
+
+void hide_caret(ME_TextEditor *editor)
+{
+  /* calls to HideCaret are cumulative; do so only once */
+  if (!editor->caret_hidden)
   {
+    ITextHost_TxShowCaret(editor->texthost, FALSE);
+    editor->caret_hidden = TRUE;
+  }
+}
+
+void update_caret(ME_TextEditor *editor)
+{
+  int x, y, height;
+
+  if (!editor->bHaveFocus) return;
+  if (!ME_IsSelection(editor))
+  {
+    ME_GetCursorCoordinates(editor, &editor->pCursors[0], &x, &y, &height);
+    if (height != editor->caret_height) create_caret(editor);
     x = min(x, editor->rcFormat.right-1);
-    ITextHost_TxCreateCaret(editor->texthost, NULL, 0, height);
     ITextHost_TxSetCaretPos(editor->texthost, x, y);
+    show_caret(editor);
   }
-}
-
-
-void ME_ShowCaret(ME_TextEditor *ed)
-{
-  ME_MoveCaret(ed);
-  if(ed->bHaveFocus && !ME_IsSelection(ed))
-    ITextHost_TxShowCaret(ed->texthost, TRUE);
-}
-
-void ME_HideCaret(ME_TextEditor *ed)
-{
-  if(!ed->bHaveFocus || ME_IsSelection(ed))
-  {
-    ITextHost_TxShowCaret(ed->texthost, FALSE);
-    DestroyCaret();
-  }
+  else
+    hide_caret(editor);
 }
 
 BOOL ME_InternalDeleteText(ME_TextEditor *editor, ME_Cursor *start,
@@ -1200,8 +1211,7 @@ void ME_LButtonDown(ME_TextEditor *editor, int x, int y, int clickNum)
     }
   }
   ME_InvalidateSelection(editor);
-  ITextHost_TxShowCaret(editor->texthost, FALSE);
-  ME_ShowCaret(editor);
+  update_caret(editor);
   ME_SendSelChange(editor);
 }
 
@@ -1233,8 +1243,7 @@ void ME_MouseMove(ME_TextEditor *editor, int x, int y)
   }
 
   ME_InvalidateSelection(editor);
-  ITextHost_TxShowCaret(editor->texthost, FALSE);
-  ME_ShowCaret(editor);
+  update_caret(editor);
   ME_SendSelChange(editor);
 }
 
@@ -1627,9 +1636,9 @@ ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
 
   ME_InvalidateSelection(editor);
   ME_Repaint(editor);
-  ITextHost_TxShowCaret(editor->texthost, FALSE);
+  hide_caret(editor);
   ME_EnsureVisible(editor, &tmp_curs);
-  ME_ShowCaret(editor);
+  update_caret(editor);
   ME_SendSelChange(editor);
   return success;
 }

dlls/riched20/editor.c

@@ -1802,9 +1802,7 @@ static LRESULT ME_StreamIn(ME_TextEditor *editor, DWORD format, EDITSTREAM *stre
   if (!(format & SFF_SELECTION)) {
     ME_ClearTempStyle(editor);
   }
-  ITextHost_TxShowCaret(editor->texthost, FALSE);
-  ME_MoveCaret(editor);
-  ITextHost_TxShowCaret(editor->texthost, TRUE);
+  update_caret(editor);
   ME_SendSelChange(editor);
   ME_SendRequestResize(editor, FALSE);
 
@@ -2158,8 +2156,7 @@ static int handle_EM_EXSETSEL( ME_TextEditor *editor, int to, int from )
     ME_InvalidateSelection( editor );
     end = ME_SetSelection( editor, to, from );
     ME_InvalidateSelection( editor );
-    ITextHost_TxShowCaret( editor->texthost, FALSE );
-    ME_ShowCaret( editor );
+    update_caret( editor );
     ME_SendSelChange( editor );
 
     return end;
@@ -3118,6 +3115,8 @@ ME_TextEditor *ME_MakeEditor(ITextHost *texthost, BOOL bEmulateVersion10)
   ed->bHaveFocus = FALSE;
   ed->bDialogMode = FALSE;
   ed->bMouseCaptured = FALSE;
+  ed->caret_hidden = FALSE;
+  ed->caret_height = 0;
   for (i=0; i<HFONT_CACHE_SIZE; i++)
   {
     ed->pFontCache[i].nRefs = 0;
@@ -3529,7 +3528,7 @@ static LRESULT ME_WmCreate(ME_TextEditor *editor, LPARAM lParam, BOOL unicode)
 
   ME_CommitUndo(editor);
   ME_WrapMarkedParagraphs(editor);
-  ME_MoveCaret(editor);
+  update_caret(editor);
   return 0;
 }
 
@@ -4511,7 +4510,8 @@ LRESULT ME_HandleMessage(ME_TextEditor *editor, UINT msg, WPARAM wParam,
     break;
   case WM_SETFOCUS:
     editor->bHaveFocus = TRUE;
-    ME_ShowCaret(editor);
+    create_caret(editor);
+    update_caret(editor);
     ME_SendOldNotify(editor, EN_SETFOCUS);
     if (!editor->bHideSelection && !(editor->styleFlags & ES_NOHIDESEL))
         ME_InvalidateSelection( editor );
@@ -4520,7 +4520,8 @@ LRESULT ME_HandleMessage(ME_TextEditor *editor, UINT msg, WPARAM wParam,
     ME_CommitUndo(editor); /* End coalesced undos for typed characters */
     editor->bHaveFocus = FALSE;
     editor->wheel_remain = 0;
-    ME_HideCaret(editor);
+    hide_caret(editor);
+    DestroyCaret();
     ME_SendOldNotify(editor, EN_KILLFOCUS);
     if (!editor->bHideSelection && !(editor->styleFlags & ES_NOHIDESEL))
         ME_InvalidateSelection( editor );
@@ -4978,6 +4979,7 @@ static LRESULT RichEditWndProc_common(HWND hWnd, UINT msg, WPARAM wParam,
       RECT rc;
       PAINTSTRUCT ps;
 
+      update_caret(editor);
       hDC = BeginPaint(editor->hWnd, &ps);
       if (!editor->bEmulateVersion10 || (editor->nEventMask & ENM_UPDATE))
         ME_SendOldNotify(editor, EN_UPDATE);

dlls/riched20/editor.h

@@ -152,9 +152,10 @@ void ME_SetDefaultCharFormat(ME_TextEditor *editor, CHARFORMAT2W *mod) DECLSPEC_
 void ME_SetCursorToStart(ME_TextEditor *editor, ME_Cursor *cursor) DECLSPEC_HIDDEN;
 int ME_SetSelection(ME_TextEditor *editor, int from, int to) DECLSPEC_HIDDEN;
 BOOL ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs) DECLSPEC_HIDDEN;
-void ME_HideCaret(ME_TextEditor *ed) DECLSPEC_HIDDEN;
-void ME_ShowCaret(ME_TextEditor *ed) DECLSPEC_HIDDEN;
-void ME_MoveCaret(ME_TextEditor *ed) DECLSPEC_HIDDEN;
+void hide_caret(ME_TextEditor *ed) DECLSPEC_HIDDEN;
+void show_caret(ME_TextEditor *ed) DECLSPEC_HIDDEN;
+void update_caret(ME_TextEditor *ed) DECLSPEC_HIDDEN;
+void create_caret(ME_TextEditor *ed) DECLSPEC_HIDDEN;
 BOOL ME_CharFromPos(ME_TextEditor *editor, int x, int y, ME_Cursor *cursor, BOOL *isExact) DECLSPEC_HIDDEN;
 void ME_LButtonDown(ME_TextEditor *editor, int x, int y, int clickNum) DECLSPEC_HIDDEN;
 void ME_MouseMove(ME_TextEditor *editor, int x, int y) DECLSPEC_HIDDEN;

dlls/riched20/editstr.h

@@ -442,6 +442,8 @@ typedef struct tagME_TextEditor
   /* Cache previously set scrollbar info */
   SCROLLINFO vert_si, horz_si;
 
+  int caret_height;
+  BOOL caret_hidden;
   BOOL bMouseCaptured;
   int wheel_remain;
   struct list style_list;

dlls/riched20/paint.c

@@ -43,7 +43,6 @@ void ME_PaintContent(ME_TextEditor *editor, HDC hDC, const RECT *rcUpdate)
 
   ME_InitContext(&c, editor, hDC);
   SetBkMode(hDC, TRANSPARENT);
-  ME_MoveCaret(editor);
   item = editor->pBuffer->pFirst->next;
   /* This context point is an offset for the paragraph positions stored
    * during wrapping. It shouldn't be modified during painting. */

dlls/riched20/table.c

@@ -613,8 +613,7 @@ void ME_TabPressedInTable(ME_TextEditor *editor, BOOL bSelectedRow)
   }
   ME_InvalidateSelection(editor);
   ME_Repaint(editor);
-  ITextHost_TxShowCaret(editor->texthost, FALSE);
-  ME_ShowCaret(editor);
+  update_caret(editor);
   ME_SendSelChange(editor);
 }