richedit: Fixed drag and shift selection for words and lines.

Previously word drag and shift selection was not implemented.  Line
drag selection was working, but shift selection wasn't.

dlls/riched20/caret.c

@@ -868,6 +868,63 @@ ME_CharFromPos(ME_TextEditor *editor, int x, int y)
           + cursor.pRun->member.run.nCharOfs + cursor.nOffset);
 }
 
+/* Extends the selection with a word, line, or paragraph selection type.
+ *
+ * The selection is anchored by editor->pCursors[2-3] such that the text
+ * between the anchors will remain selected, and one end will be extended.
+ *
+ * editor->pCursors[0] should have the position to extend the selection to
+ * before this function is called.
+ *
+ * Nothing will be done if editor->nSelectionType equals stPosition.
+ */
+static void ME_ExtendAnchorSelection(ME_TextEditor *editor)
+{
+  ME_Cursor tmp_cursor;
+  int curOfs, anchorStartOfs, anchorEndOfs;
+  if (editor->nSelectionType == stPosition)
+      return;
+  curOfs = ME_GetCursorOfs(editor, 0);
+  anchorStartOfs = ME_GetCursorOfs(editor, 2);
+  anchorEndOfs = ME_GetCursorOfs(editor, 3);
+
+  tmp_cursor = editor->pCursors[0];
+  editor->pCursors[0] = editor->pCursors[2];
+  editor->pCursors[1] = editor->pCursors[3];
+  if (curOfs < anchorStartOfs)
+  {
+      /* Extend the left side of selection */
+      editor->pCursors[0] = tmp_cursor;
+      if (editor->nSelectionType == stWord)
+          ME_MoveCursorWords(editor, &editor->pCursors[0], -1);
+      else
+      {
+          ME_DisplayItem *pItem;
+          pItem = ME_FindItemBack(editor->pCursors[0].pRun,
+                                  diStartRowOrParagraph);
+          editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
+          editor->pCursors[0].nOffset = 0;
+      }
+  }
+  else if (curOfs >= anchorEndOfs)
+  {
+      /* Extend the right side of selection */
+      editor->pCursors[1] = tmp_cursor;
+      if (editor->nSelectionType == stWord)
+          ME_MoveCursorWords(editor, &editor->pCursors[1], +1);
+      else
+      {
+          ME_DisplayItem *pItem;
+          pItem = ME_FindItemFwd(editor->pCursors[1].pRun,
+                                 diStartRowOrParagraphOrEnd);
+          if (pItem->type == diTextEnd)
+              editor->pCursors[1].pRun = ME_FindItemBack(pItem, diRun);
+          else
+              editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
+          editor->pCursors[1].nOffset = 0;
+      }
+  }
+}
 
 void ME_LButtonDown(ME_TextEditor *editor, int x, int y, int clickNum)
 {
@@ -881,51 +938,54 @@ void ME_LButtonDown(ME_TextEditor *editor, int x, int y, int clickNum)
   tmp_cursor = editor->pCursors[0];
   is_selection = ME_IsSelection(editor);
 
-  if (x >= editor->selofs)
+  ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
+
+  if (x >= editor->selofs || GetKeyState(VK_SHIFT) < 0)
   {
-    ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
+    if (clickNum > 1)
-    if (GetKeyState(VK_SHIFT)>=0)
     {
-      /* Shift key is not down */
+      editor->nSelectionType = stWord;
       editor->pCursors[1] = editor->pCursors[0];
-      if (clickNum > 1)
+      ME_SelectWord(editor);
-          ME_SelectWord(editor);
+      /* Store the anchor positions for extending the selection. */
+      editor->pCursors[2] = editor->pCursors[0];
+      editor->pCursors[3] = editor->pCursors[1];
     }
-    else if (!is_selection) {
+    else if (GetKeyState(VK_SHIFT)>=0)
+    {
+      /* Shift is not down */
+      editor->nSelectionType = stPosition;
+      editor->pCursors[1] = editor->pCursors[0];
+    }
+    else if (!is_selection)
+    {
+      editor->nSelectionType = stPosition;
       editor->pCursors[1] = tmp_cursor;
-      is_selection = 1;
+    }
+    else if (editor->nSelectionType != stPosition)
+    {
+      ME_ExtendAnchorSelection(editor);
     }
   }
   else
   {
-    ME_DisplayItem *pRow;
+    ME_DisplayItem *pItem;
 
-    editor->linesel = 1;
+    editor->nSelectionType = stLine;
-    editor->sely = y;
     /* Set pCursors[0] to beginning of line */
-    ME_FindPixelPos(editor, x, y, &editor->pCursors[1], &editor->bCaretAtEnd);
     /* Set pCursors[1] to end of line */
-    pRow = ME_FindItemFwd(editor->pCursors[1].pRun, diStartRowOrParagraphOrEnd);
+    pItem = ME_FindItemFwd(editor->pCursors[0].pRun, diStartRowOrParagraphOrEnd);
-    assert(pRow);
+    assert(pItem);
+    if (pItem->type == diTextEnd)
+        editor->pCursors[1].pRun = ME_FindItemBack(pItem, diRun);
+    else
+        editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
+    editor->pCursors[1].nOffset = 0;
     /* pCursor[0] is the position where the cursor will be drawn,
      * pCursor[1] is the other end of the selection range
-     * pCursor[2] and [3] are backups of [0] and [1] so I
+     * pCursor[2] and [3] are the selection anchors that are backed up
-     * don't have to look them up again
+     * so they are kept when the selection changes for drag line selection.
      */
-
-    if (pRow->type == diStartRow) {
-      /* FIXME WTF was I thinking about here ? */
-      ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
-      assert(pRun);
-      editor->pCursors[0].pRun = pRun;
-      editor->pCursors[0].nOffset = 0;
-      editor->bCaretAtEnd = 1;
-    } else {
-      editor->pCursors[0].pRun = ME_FindItemBack(pRow, diRun);
-      assert(editor->pCursors[0].pRun && editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA);
-      editor->pCursors[0].nOffset = 0;
-      editor->bCaretAtEnd = 0;
-    }
     editor->pCursors[2] = editor->pCursors[0];
     editor->pCursors[3] = editor->pCursors[1];
   }
@@ -945,31 +1005,26 @@ void ME_MouseMove(ME_TextEditor *editor, int x, int y)
 
   tmp_cursor = editor->pCursors[0];
   /* FIXME: do something with the return value of ME_FindPixelPos */
-  if (!editor->linesel)
+  ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
-    ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
-  else ME_FindPixelPos(editor, (y > editor->sely) * editor->rcFormat.right, y, &tmp_cursor, &editor->bCaretAtEnd);
-
-  if (!memcmp(&tmp_cursor, editor->pCursors, sizeof(tmp_cursor)))
-    return;
 
   ME_InvalidateSelection(editor);
-  if (!editor->linesel)
+  editor->pCursors[0] = tmp_cursor;
-    editor->pCursors[0] = tmp_cursor;
+  ME_ExtendAnchorSelection(editor);
-  else if (!memcmp(&tmp_cursor, editor->pCursors+2, sizeof(tmp_cursor)) ||
+
-           !memcmp(&tmp_cursor, editor->pCursors+3, sizeof(tmp_cursor)))
+  if (editor->nSelectionType != stPosition &&
+      memcmp(&editor->pCursors[1], &editor->pCursors[3], sizeof(ME_Cursor)))
   {
-    editor->pCursors[0] = editor->pCursors[2];
+      /* The scroll the cursor towards the other end, since it was the one
-    editor->pCursors[1] = editor->pCursors[3];
+       * extended by ME_ExtendAnchorSelection
-  }
+       */
-  else if (y < editor->sely)
+      ME_Cursor tmpCursor = editor->pCursors[0];
-  {
+      editor->pCursors[0] = editor->pCursors[1];
-    editor->pCursors[0] = tmp_cursor;
+      editor->pCursors[1] = tmpCursor;
-    editor->pCursors[1] = editor->pCursors[2];
+      SendMessageW(editor->hWnd, EM_SCROLLCARET, 0, 0);
-  }
+      editor->pCursors[1] = editor->pCursors[0];
-  else
+      editor->pCursors[0] = tmpCursor;
-  {
+  } else {
-    editor->pCursors[0] = tmp_cursor;
+      SendMessageW(editor->hWnd, EM_SCROLLCARET, 0, 0);
-    editor->pCursors[1] = editor->pCursors[3];
   }
 
   HideCaret(editor->hWnd);
@@ -977,7 +1032,6 @@ void ME_MouseMove(ME_TextEditor *editor, int x, int y)
   ME_InvalidateSelection(editor);
   ShowCaret(editor->hWnd);
   ME_SendSelChange(editor);
-  SendMessageW(editor->hWnd, EM_SCROLLCARET, 0, 0);
 }
 
 static ME_DisplayItem *ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow, 

dlls/riched20/editor.c

@@ -1537,7 +1537,10 @@ ME_KeyDown(ME_TextEditor *editor, WORD nKey)
 {
   BOOL ctrl_is_down = GetKeyState(VK_CONTROL) & 0x8000;
   BOOL shift_is_down = GetKeyState(VK_SHIFT) & 0x8000;
-  
+
+  if (nKey != VK_SHIFT && nKey != VK_CONTROL && nKey != VK_MENU)
+      editor->nSelectionType = stPosition;
+
   switch (nKey)
   {
     case VK_LEFT:
@@ -1612,7 +1615,8 @@ ME_KeyDown(ME_TextEditor *editor, WORD nKey)
 static BOOL ME_SetCursor(ME_TextEditor *editor, int x)
 {
   if ((GetWindowLongW(editor->hWnd, GWL_STYLE) & ES_SELECTIONBAR) &&
-      (x < editor->selofs || editor->linesel))
+      (x < editor->selofs ||
+       (editor->nSelectionType == stLine && GetCapture() == editor->hWnd)))
   {
       SetCursor(hLeft);
       return TRUE;
@@ -1654,6 +1658,12 @@ ME_TextEditor *ME_MakeEditor(HWND hWnd) {
   ed->nZoomNumerator = ed->nZoomDenominator = 0;
   ME_MakeFirstParagraph(ed);
   ed->bCaretShown = FALSE;
+  /* The four cursors are for:
+   * 0 - The position where the caret is shown
+   * 1 - The anchored end of the selection (for normal selection)
+   * 2 & 3 - The anchored start and end respectively for word, line,
+   * or paragraph selection.
+   */
   ed->nCursors = 4;
   ed->pCursors = ALLOC_N_OBJ(ME_Cursor, ed->nCursors);
   ed->pCursors[0].pRun = ME_FindItemFwd(ed->pBuffer->pFirst, diRun);
@@ -1700,7 +1710,7 @@ ME_TextEditor *ME_MakeEditor(HWND hWnd) {
     ed->selofs = SELECTIONBAR_WIDTH;
   else
     ed->selofs = 0;
-  ed->linesel = 0;
+  ed->nSelectionType = stPosition;
 
   if (GetWindowLongW(hWnd, GWL_STYLE) & ES_PASSWORD)
     ed->cPasswordMask = '*';
@@ -3000,7 +3010,6 @@ static LRESULT RichEditWndProc_common(HWND hWnd, UINT msg, WPARAM wParam,
     else
     {
       BOOL ret;
-      editor->linesel = 0;
       ret = ME_SetCursor(editor, LOWORD(lParam));
       ME_LinkNotify(editor,msg,wParam,lParam);
       if (!ret) goto do_default;

dlls/riched20/editstr.h

@@ -244,6 +244,12 @@ typedef enum {
   umAddBackToUndo
 } ME_UndoMode;
 
+typedef enum {
+  stPosition = 0,
+  stWord,
+  stLine
+} ME_SelectionType;
+
 typedef struct tagME_FontTableItem {
   BYTE bCharSet;
   WCHAR *szFaceName;
@@ -333,7 +339,8 @@ typedef struct tagME_TextEditor
   BOOL bHaveFocus;
   /*for IME */
   int imeStartIndex;
-  DWORD selofs, linesel, sely;
+  DWORD selofs; /* The size of the selection bar on the left side of control */
+  ME_SelectionType nSelectionType;
 
   /* Track previous notified selection */
   CHARRANGE notified_cr;