1/* 2* Copyright (c) 2020 (https://github.com/phase1geo/Outliner) 3* 4* This program is free software; you can redistribute it and/or 5* modify it under the terms of the GNU General Public 6* License as published by the Free Software Foundation; either 7* version 2 of the License, or (at your option) any later version. 8* 9* This program is distributed in the hope that it will be useful, 10* but WITHOUT ANY WARRANTY; without even the implied warranty of 11* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12* General Public License for more details. 13* 14* You should have received a copy of the GNU General Public 15* License along with this program; if not, write to the 16* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17* Boston, MA 02110-1301 USA 18* 19* Authored by: Trevor Williams <phase1geo@gmail.com> 20*/ 21 22public class UndoTextDelete : UndoTextItem { 23 24 public string text { private set; get; } 25 public int start { private set; get; } 26 public Array<UndoTagInfo> tags { private set; get; } 27 28 /* Default constructor */ 29 public UndoTextDelete( string text, int start, Array<UndoTagInfo> tags, int start_cursor, int end_cursor ) { 30 base( _( "text deletion" ), UndoTextOp.DELETE, start_cursor, end_cursor ); 31 this.text = text; 32 this.start = start; 33 this.tags = tags; 34 } 35 36 /* Causes the stored item to be put into the before state */ 37 public override void undo_text( DrawArea da, CanvasText ct ) { 38 ct.text.insert_text( start, text ); 39 ct.text.apply_tags( tags, start ); 40 ct.set_cursor_only( start_cursor ); 41 da.queue_draw(); 42 } 43 44 /* Causes the stored item to be put into the after state */ 45 public override void redo_text( DrawArea da, CanvasText ct ) { 46 ct.text.remove_text( start, text.length ); 47 ct.set_cursor_only( end_cursor ); 48 da.queue_draw(); 49 } 50 51 /* Merges the given text item with the current only */ 52 public override bool merge( CanvasText ct, UndoTextItem item ) { 53 if( (end_cursor == item.start_cursor) && (item.op == UndoTextOp.DELETE) ) { 54 var delete = item as UndoTextDelete; 55 end_cursor = delete.end_cursor; 56 text = delete.text + text; 57 start = delete.start; 58 return( true ); 59 } 60 return( false ); 61 } 62 63} 64