blame: source/code/ReadKeyboard.cpp

/*

===========================================================================

blockattack - Block Attack - Rise of the Blocks

Copyright (C) 2005-2018 Poul Sander

This program is free software: you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation, either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program.  If not, see http://www.gnu.org/licenses/

Source information and contacts persons can be found at

https://blockattack.net

===========================================================================

*/

#include "ReadKeyboard.h"

#include "utf8.h"

#include <iostream>

ReadKeyboard::ReadKeyboard(void) {

	maxLength = 16;

	position = text_string.begin();

}

ReadKeyboard::~ReadKeyboard(void) {

}

int ReadKeyboard::CharsBeforeCursor() {

	return std::distance(text_string.begin(), position);

}

ReadKeyboard::ReadKeyboard(const char* oldName) : maxLength(16), text_string(oldName) {

	position = text_string.end();

}

void ReadKeyboard::putchar(const std::string& thing) {

	if ( (int)text_string.length() < maxLength) {

		int oldPostition = utf8::distance(text_string.begin(), position);

		int lengthOfInsertString = utf8::distance(thing.begin(), thing.end());

		text_string.insert(position, thing.begin(), thing.end());

		position = text_string.begin();  //Inserting may destroy our old iterator

		utf8::advance(position, oldPostition + lengthOfInsertString, text_string.end());

	}

}

void ReadKeyboard::removeChar() {

	if (position < text_string.end()) {

		std::string::iterator endChar= position;

		utf8::advance(endChar, 1, text_string.end());

		text_string.erase(position, endChar);

	}

}

bool ReadKeyboard::ReadKey(const SDL_Event& key) {

	if (key.type == SDL_TEXTINPUT) {

		putchar(key.text.text);

		if (key.text.text[0] != 0) {

			return true;

		}

	}

	return ReadKey(key.key.keysym.sym);

}

bool ReadKeyboard::cursorLeft() {

	if (position>text_string.begin()) {

		utf8::prior(position, text_string.begin());

		return true;

	}

	return false;

}

bool ReadKeyboard::cursorRight() {

	if (position<text_string.end()) {

		utf8::next(position, text_string.end());

		return true;

	}

	return false;

}

bool ReadKeyboard::emulateBackspace() {

	if (position>text_string.begin()) {

		utf8::prior(position, text_string.begin());

		ReadKeyboard::removeChar();

		return true;

	}

	return false;

}

bool ReadKeyboard::ReadKey(SDL_Keycode keyPressed) {

	if (keyPressed == SDLK_DELETE) {

		if ((text_string.length()>0)&& (position<text_string.end())) {

			ReadKeyboard::removeChar();

		}

		return true;

	}

	if (keyPressed == SDLK_BACKSPACE) {

		return emulateBackspace();

	}

	if (keyPressed == SDLK_HOME) {

		position = text_string.begin();

		return true;

	}

	if (keyPressed == SDLK_END) {

		position=text_string.end();

		return true;

	}

	if (keyPressed == SDLK_LEFT) {

		cursorLeft();

		return true;

	}

	if ((keyPressed == SDLK_RIGHT)) {

		cursorRight();

		return true;

	}

	return true;

}

const std::string& ReadKeyboard::GetString() const {

	return text_string;

}