TextBoxEditString.h

#pragma once
#include "TextBox.h"

template <class T> class TextBoxEditTString : public TextBox
{
    const static int _bufSize = 70;
    const static int _editSize = 18;
    int _editPos, _caretPos, _bufLen;
    char _buf[_bufSize+1];
    char _tmpBuf[20];
public:
    TextBoxEditTString(int left,int top,int width,int height,T *text):TextBox(left,top,width,height)
    {
        _editPos = -1;
        _bufLen = 0;
        _caretPos = -1;
    }
    virtual void OnDraw(DC *dc)
    {
        TextBox::OnDraw(dc);
        dc->DrawText(_tmpBuf,_offset_x,_offset_y);
        dc->DrawCaret(_caretPos, _offset_x, _offset_y);
    }
    void GetEditText() {
        int s, e;
        s = _bufLen - _editSize;
        if (s<0)
            s = 0;
        e = (_bufLen > _editSize)? _editSize : _bufLen;
        strncpy(_tmpBuf, _buf+s, e);
        _tmpBuf[e] = 0;
    }
    void SetText(T *text)
    {
        if (_caretPos == -1)
        {
            int len;
            len = strlen(text);
            _bufLen = (len > _bufSize)? _bufSize : len;
            strncpy(_buf, text, _bufLen);
            _buf[_bufLen] = 0;
            _editPos = _bufLen;
            _caretPos = (_bufLen > _editSize)? _editSize : _bufLen;
            GetEditText();
        }
        if(_changedEvent!=NULL)
            _changedEvent->NotifyContentChanged(this);
        Invalidate();
    }
    T * GetText()
    {
        char *s;
        s = (char*) malloc(sizeof(char) * (strlen(_buf)+1) );
        strcpy(s, _buf);
        return s;
    }
    void Closed() {
        _editPos = -1;
        _bufLen = 0;
        _caretPos = -1;
        //_buf[0] = 0;
        _tmpBuf[0] = 0;
    }
    void UpdateEdit(byte b)
    {
        int i;
        switch(b) {
            case 8: //backspace
                if (_editPos>0) {
                    for (i=_editPos-1; i<_bufLen; i++)
                        _buf[i] = _buf[i+1];
                    _editPos--;
                    _bufLen--;
                    if (_bufLen < _editSize)
                        _caretPos--;
                }
                break;
            case 13: //clear
                _editPos = 0;
                _bufLen = 0;
                _caretPos = 0;
                _buf[0] = 0;
                break;
            default: //add/insert char
                if ((_editPos < _bufSize) && (_bufLen < _bufSize)) {
                    if (_editPos != _bufLen) {
                        for (i=_bufLen; i>=_editPos; i--)
                            _buf[i+1] = _buf[i];
                    }
                    _buf[_editPos++] = (char)b;
                    _bufLen++;
                    if (_caretPos<_editSize)
                        _caretPos++;
                    if (_editPos == _bufLen)
                        _buf[_editPos] = 0;
                }
                break;
        }
        if (_bufLen>0)
            GetEditText();
        else
            _tmpBuf[0] = 0;
        SetText(_tmpBuf);
    }
};
typedef TextBoxEditTString<const __FlashStringHelper> TextBoxEditFString;
typedef TextBoxEditTString<char> TextBoxEditString;