The structure always remembers the current index – from which point we can go backwards (undo – GetPreviousElement) or forward (redo – GetNextElement). The class is initialized with a generic variable type T, and it takes as parameter the desired capacity of the Deque – meaning how many undo objects will it be able to remember.Įlements can be added (pushed), and taken (pulled) from the structure.
The backbone of a Deque object is a LinkedList. While (_list.Count - 1 > _index & _list.Count != 0)
_index = Math.Min(_index + 1, _list.Count - 1) if index is somewhere in between, delete all the values on higher indexes else if(_index (_index) if capacity is full and index is at the last element, remove first if (_list.Count = Capacity & _index = Capacity - 1) NET Framework, so I needed to build one myself for this purpose. Such a structure is called a „deque“ and it does not (still) exist as a built-in class in. (The undo / redo refers to all the „apply changes“ actions.)įor the undo / redo functionality to work, we need a sort-of double-sided stack structure (something where we can push and pull elements from each side of the list). The app also supports undo / redo functionality. MessageBoxButtons.OK, MessageBoxIcon.Error) MessageBox.Show( " Expected number of filenames is " +į(), " Invalid number of filenames", Private void checkBox1_CheckedChanged( object sender, EventArgs e) To achieve this, I introduced a Dictionary type variable called selections: Highlighted text gets edited, but in order to programatically loop through these highlighted selections, the code must be able to recognize which text exactly is highlighted. If ( this.DialogResult = DialogResult.OK)įorm.StartPosition = FormStartPosition.Manual Private void Tbx_KeyUp( object sender, KeyEventArgs e) This.FormBorderStyle = FormBorderStyle.None The entered string is confirmed ( OK) by pressing ENTER, and it is rejected ( Cancel) by pressing ESCAPE. It is always shown on current mouse position. The MyInputBox is shown by calling the static method ShowDialog, similar to MessageBox. Selections.Add( new Tuple(startIndex, 0)) įor( int i = 0 i (selections.Item1 +įor the purpose of entering the replacement/insertion string, I have designed a special input box (separate class), which basically consists of only an empty textbox (no surrounding form). If (selections.Where(x => x.Value.Count > 0).Count() = 0) check if selections are clear - allowed for insert int startIndex Private void ReplaceInsert( string newString, bool replace)
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