483 lines
14 KiB
C
483 lines
14 KiB
C
/*
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* RichEdit - functions dealing with editor object
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*
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* Copyright 2004 by Krzysztof Foltman
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "editor.h"
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WINE_DEFAULT_DEBUG_CHANNEL(richedit);
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static void destroy_undo_item( struct undo_item *undo )
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{
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switch( undo->type )
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{
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case undo_insert_run:
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heap_free( undo->u.insert_run.str );
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ME_ReleaseStyle( undo->u.insert_run.style );
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break;
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case undo_split_para:
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ME_DestroyString( undo->u.split_para.eol_str );
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break;
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default:
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break;
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}
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heap_free( undo );
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}
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static void empty_redo_stack(ME_TextEditor *editor)
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{
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struct undo_item *cursor, *cursor2;
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LIST_FOR_EACH_ENTRY_SAFE( cursor, cursor2, &editor->redo_stack, struct undo_item, entry )
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{
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list_remove( &cursor->entry );
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destroy_undo_item( cursor );
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}
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}
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void ME_EmptyUndoStack(ME_TextEditor *editor)
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{
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struct undo_item *cursor, *cursor2;
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if (editor->nUndoMode == umIgnore)
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return;
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TRACE("Emptying undo stack\n");
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editor->nUndoStackSize = 0;
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LIST_FOR_EACH_ENTRY_SAFE( cursor, cursor2, &editor->undo_stack, struct undo_item, entry )
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{
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list_remove( &cursor->entry );
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destroy_undo_item( cursor );
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}
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empty_redo_stack( editor );
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}
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static struct undo_item *add_undo( ME_TextEditor *editor, enum undo_type type )
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{
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struct undo_item *undo, *item;
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struct list *head;
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if (editor->nUndoMode == umIgnore) return NULL;
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if (editor->nUndoLimit == 0) return NULL;
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undo = heap_alloc( sizeof(*undo) );
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if (!undo) return NULL;
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undo->type = type;
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if (editor->nUndoMode == umAddToUndo || editor->nUndoMode == umAddBackToUndo)
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{
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head = list_head( &editor->undo_stack );
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if (head)
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{
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item = LIST_ENTRY( head, struct undo_item, entry );
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if (item->type == undo_potential_end_transaction)
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item->type = undo_end_transaction;
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}
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if (editor->nUndoMode == umAddToUndo)
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TRACE("Pushing id=%d to undo stack, deleting redo stack\n", type);
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else
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TRACE("Pushing id=%d to undo stack\n", type);
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list_add_head( &editor->undo_stack, &undo->entry );
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if (type == undo_end_transaction || type == undo_potential_end_transaction)
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editor->nUndoStackSize++;
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if (editor->nUndoStackSize > editor->nUndoLimit)
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{
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struct undo_item *cursor2;
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/* remove oldest undo from stack */
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LIST_FOR_EACH_ENTRY_SAFE_REV( item, cursor2, &editor->undo_stack, struct undo_item, entry )
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{
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BOOL done = (item->type == undo_end_transaction);
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list_remove( &item->entry );
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destroy_undo_item( item );
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if (done) break;
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}
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editor->nUndoStackSize--;
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}
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/* any new operation (not redo) clears the redo stack */
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if (editor->nUndoMode == umAddToUndo) empty_redo_stack( editor );
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}
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else if (editor->nUndoMode == umAddToRedo)
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{
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TRACE("Pushing id=%d to redo stack\n", type);
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list_add_head( &editor->redo_stack, &undo->entry );
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}
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return undo;
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}
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BOOL add_undo_insert_run( ME_TextEditor *editor, int pos, const WCHAR *str, int len, int flags, ME_Style *style )
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{
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struct undo_item *undo = add_undo( editor, undo_insert_run );
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if (!undo) return FALSE;
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undo->u.insert_run.str = heap_alloc( (len + 1) * sizeof(WCHAR) );
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if (!undo->u.insert_run.str)
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{
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ME_EmptyUndoStack( editor );
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return FALSE;
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}
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memcpy( undo->u.insert_run.str, str, len * sizeof(WCHAR) );
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undo->u.insert_run.str[len] = 0;
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undo->u.insert_run.pos = pos;
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undo->u.insert_run.len = len;
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undo->u.insert_run.flags = flags;
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undo->u.insert_run.style = style;
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ME_AddRefStyle( style );
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return TRUE;
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}
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BOOL add_undo_set_para_fmt( ME_TextEditor *editor, const ME_Paragraph *para )
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{
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struct undo_item *undo = add_undo( editor, undo_set_para_fmt );
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if (!undo) return FALSE;
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undo->u.set_para_fmt.pos = para->nCharOfs;
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undo->u.set_para_fmt.fmt = para->fmt;
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undo->u.set_para_fmt.border = para->border;
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return TRUE;
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}
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BOOL add_undo_set_char_fmt( ME_TextEditor *editor, int pos, int len, const CHARFORMAT2W *fmt )
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{
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struct undo_item *undo = add_undo( editor, undo_set_char_fmt );
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if (!undo) return FALSE;
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undo->u.set_char_fmt.pos = pos;
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undo->u.set_char_fmt.len = len;
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undo->u.set_char_fmt.fmt = *fmt;
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return TRUE;
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}
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BOOL add_undo_join_paras( ME_TextEditor *editor, int pos )
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{
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struct undo_item *undo = add_undo( editor, undo_join_paras );
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if (!undo) return FALSE;
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undo->u.join_paras.pos = pos;
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return TRUE;
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}
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BOOL add_undo_split_para( ME_TextEditor *editor, const ME_Paragraph *para, ME_String *eol_str, const ME_Cell *cell )
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{
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struct undo_item *undo = add_undo( editor, undo_split_para );
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if (!undo) return FALSE;
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undo->u.split_para.pos = para->nCharOfs - eol_str->nLen;
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undo->u.split_para.eol_str = eol_str;
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undo->u.split_para.fmt = para->fmt;
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undo->u.split_para.border = para->border;
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undo->u.split_para.flags = para->prev_para->member.para.nFlags & ~MEPF_CELL;
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if (cell)
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{
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undo->u.split_para.cell_border = cell->border;
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undo->u.split_para.cell_right_boundary = cell->nRightBoundary;
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}
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return TRUE;
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}
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BOOL add_undo_delete_run( ME_TextEditor *editor, int pos, int len )
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{
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struct undo_item *undo = add_undo( editor, undo_delete_run );
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if (!undo) return FALSE;
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undo->u.delete_run.pos = pos;
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undo->u.delete_run.len = len;
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return TRUE;
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}
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/**
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* Commits preceding changes into a transaction that can be undone together.
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*
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* This should be called after all the changes occur associated with an event
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* so that the group of changes can be undone atomically as a transaction.
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*
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* This will have no effect the undo mode is set to ignore changes, or if no
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* changes preceded calling this function before the last time it was called.
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*
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* This can also be used to conclude a coalescing transaction (used for grouping
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* typed characters).
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*/
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void ME_CommitUndo(ME_TextEditor *editor)
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{
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struct undo_item *item;
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struct list *head;
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if (editor->nUndoMode == umIgnore)
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return;
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assert(editor->nUndoMode == umAddToUndo);
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/* no transactions, no need to commit */
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head = list_head( &editor->undo_stack );
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if (!head) return;
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/* no need to commit empty transactions */
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item = LIST_ENTRY( head, struct undo_item, entry );
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if (item->type == undo_end_transaction) return;
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if (item->type == undo_potential_end_transaction)
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{
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item->type = undo_end_transaction;
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return;
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}
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add_undo( editor, undo_end_transaction );
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}
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/**
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* Groups subsequent changes with previous ones for an undo if coalescing.
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*
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* Has no effect if the previous changes were followed by a ME_CommitUndo. This
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* function will only have an affect if the previous changes were followed by
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* a call to ME_CommitCoalescingUndo, which allows the transaction to be
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* continued.
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*
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* This allows multiple consecutively typed characters to be grouped together
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* to be undone by a single undo operation.
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*/
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void ME_ContinueCoalescingTransaction(ME_TextEditor *editor)
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{
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struct undo_item *item;
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struct list *head;
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if (editor->nUndoMode == umIgnore)
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return;
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assert(editor->nUndoMode == umAddToUndo);
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head = list_head( &editor->undo_stack );
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if (!head) return;
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item = LIST_ENTRY( head, struct undo_item, entry );
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if (item->type == undo_potential_end_transaction)
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{
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list_remove( &item->entry );
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editor->nUndoStackSize--;
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destroy_undo_item( item );
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}
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}
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/**
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* Commits preceding changes into a undo transaction that can be expanded.
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*
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* This function allows the transaction to be reopened with
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* ME_ContinueCoalescingTransaction in order to continue the transaction. If an
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* undo item is added to the undo stack as a result of a change without the
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* transaction being reopened, then the transaction will be ended, and the
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* changes will become a part of the next transaction.
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*
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* This is used to allow typed characters to be grouped together since each
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* typed character results in a single event, and each event adding undo items
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* must be committed. Using this function as opposed to ME_CommitUndo allows
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* multiple events to be grouped, and undone together.
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*/
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void ME_CommitCoalescingUndo(ME_TextEditor *editor)
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{
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struct undo_item *item;
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struct list *head;
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if (editor->nUndoMode == umIgnore)
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return;
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assert(editor->nUndoMode == umAddToUndo);
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head = list_head( &editor->undo_stack );
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if (!head) return;
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/* no need to commit empty transactions */
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item = LIST_ENTRY( head, struct undo_item, entry );
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if (item->type == undo_end_transaction ||
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item->type == undo_potential_end_transaction)
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return;
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add_undo( editor, undo_potential_end_transaction );
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}
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static void ME_PlayUndoItem(ME_TextEditor *editor, struct undo_item *undo)
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{
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if (editor->nUndoMode == umIgnore)
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return;
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TRACE("Playing undo/redo item, id=%d\n", undo->type);
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switch(undo->type)
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{
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case undo_potential_end_transaction:
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case undo_end_transaction:
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assert(0);
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case undo_set_para_fmt:
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{
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ME_Cursor tmp;
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cursor_from_char_ofs( editor, undo->u.set_para_fmt.pos, &tmp );
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add_undo_set_para_fmt( editor, &tmp.pPara->member.para );
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tmp.pPara->member.para.fmt = undo->u.set_para_fmt.fmt;
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tmp.pPara->member.para.border = undo->u.set_para_fmt.border;
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para_mark_rewrap( editor, &tmp.pPara->member.para );
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break;
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}
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case undo_set_char_fmt:
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{
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ME_Cursor start, end;
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cursor_from_char_ofs( editor, undo->u.set_char_fmt.pos, &start );
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end = start;
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ME_MoveCursorChars(editor, &end, undo->u.set_char_fmt.len, FALSE);
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ME_SetCharFormat(editor, &start, &end, &undo->u.set_char_fmt.fmt);
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break;
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}
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case undo_insert_run:
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{
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ME_Cursor tmp;
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cursor_from_char_ofs( editor, undo->u.insert_run.pos, &tmp );
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run_insert( editor, &tmp, undo->u.insert_run.style,
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undo->u.insert_run.str, undo->u.insert_run.len,
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undo->u.insert_run.flags );
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break;
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}
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case undo_delete_run:
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{
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ME_Cursor tmp;
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cursor_from_char_ofs( editor, undo->u.delete_run.pos, &tmp );
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ME_InternalDeleteText(editor, &tmp, undo->u.delete_run.len, TRUE);
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break;
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}
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case undo_join_paras:
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{
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ME_Cursor tmp;
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cursor_from_char_ofs( editor, undo->u.join_paras.pos, &tmp );
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para_join( editor, &tmp.pPara->member.para, TRUE );
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break;
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}
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case undo_split_para:
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{
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ME_Cursor tmp;
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ME_Paragraph *this_para, *new_para;
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BOOL bFixRowStart;
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int paraFlags = undo->u.split_para.flags & (MEPF_ROWSTART|MEPF_CELL|MEPF_ROWEND);
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cursor_from_char_ofs( editor, undo->u.split_para.pos, &tmp );
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if (tmp.nOffset) run_split( editor, &tmp );
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this_para = &tmp.pPara->member.para;
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bFixRowStart = this_para->nFlags & MEPF_ROWSTART;
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if (bFixRowStart)
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{
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/* Re-insert the paragraph before the table, making sure the nFlag value
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* is correct. */
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this_para->nFlags &= ~MEPF_ROWSTART;
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}
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new_para = para_split( editor, &tmp.pRun->member.run, tmp.pRun->member.run.style,
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undo->u.split_para.eol_str->szData, undo->u.split_para.eol_str->nLen, paraFlags );
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if (bFixRowStart)
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new_para->nFlags |= MEPF_ROWSTART;
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new_para->fmt = undo->u.split_para.fmt;
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new_para->border = undo->u.split_para.border;
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if (paraFlags)
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{
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ME_DisplayItem *pCell = new_para->pCell;
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pCell->member.cell.nRightBoundary = undo->u.split_para.cell_right_boundary;
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pCell->member.cell.border = undo->u.split_para.cell_border;
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}
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break;
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}
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}
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}
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BOOL ME_Undo(ME_TextEditor *editor)
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{
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ME_UndoMode nMode = editor->nUndoMode;
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struct list *head;
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struct undo_item *undo, *cursor2;
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if (editor->nUndoMode == umIgnore) return FALSE;
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assert(nMode == umAddToUndo || nMode == umIgnore);
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head = list_head( &editor->undo_stack );
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if (!head) return FALSE;
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/* watch out for uncommitted transactions ! */
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undo = LIST_ENTRY( head, struct undo_item, entry );
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assert(undo->type == undo_end_transaction
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|| undo->type == undo_potential_end_transaction);
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editor->nUndoMode = umAddToRedo;
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list_remove( &undo->entry );
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destroy_undo_item( undo );
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LIST_FOR_EACH_ENTRY_SAFE( undo, cursor2, &editor->undo_stack, struct undo_item, entry )
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{
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if (undo->type == undo_end_transaction) break;
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ME_PlayUndoItem( editor, undo );
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list_remove( &undo->entry );
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destroy_undo_item( undo );
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}
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table_move_from_row_start( editor );
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add_undo( editor, undo_end_transaction );
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editor->nUndoStackSize--;
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editor->nUndoMode = nMode;
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ME_UpdateRepaint(editor, FALSE);
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return TRUE;
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}
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BOOL ME_Redo(ME_TextEditor *editor)
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{
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ME_UndoMode nMode = editor->nUndoMode;
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struct list *head;
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struct undo_item *undo, *cursor2;
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assert(nMode == umAddToUndo || nMode == umIgnore);
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if (editor->nUndoMode == umIgnore) return FALSE;
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head = list_head( &editor->redo_stack );
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if (!head) return FALSE;
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/* watch out for uncommitted transactions ! */
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undo = LIST_ENTRY( head, struct undo_item, entry );
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assert( undo->type == undo_end_transaction );
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editor->nUndoMode = umAddBackToUndo;
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list_remove( &undo->entry );
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destroy_undo_item( undo );
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LIST_FOR_EACH_ENTRY_SAFE( undo, cursor2, &editor->redo_stack, struct undo_item, entry )
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{
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if (undo->type == undo_end_transaction) break;
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ME_PlayUndoItem( editor, undo );
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list_remove( &undo->entry );
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destroy_undo_item( undo );
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}
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table_move_from_row_start( editor );
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add_undo( editor, undo_end_transaction );
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editor->nUndoMode = nMode;
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ME_UpdateRepaint(editor, FALSE);
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return TRUE;
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}
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