130 lines
2.7 KiB
C++
130 lines
2.7 KiB
C++
#include "textwindow.h"
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#include "../utils/math.h"
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TextWindow::TextWindow(unsigned from_col, unsigned to_col, unsigned from_row,
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unsigned to_row, bool use_cursor)
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: from_col(from_col),
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to_col(to_col),
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from_row(from_row),
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to_row(to_row),
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use_cursor(use_cursor),
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pos_x(from_col),
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pos_y(from_row) {
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if (to_col > from_col && to_row > from_row) {
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reset();
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}
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}
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void TextWindow::setPos(unsigned rel_x, unsigned rel_y) {
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unsigned abs_x = rel_x + from_col;
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unsigned abs_y = rel_y + from_row;
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// Check if visible
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if (abs_x < to_col && abs_y < to_row) {
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if (use_cursor) {
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CGA::setCursor(abs_x, abs_y);
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} else {
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pos_x = abs_x;
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pos_y = abs_y;
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}
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}
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}
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void TextWindow::getPos(unsigned& rel_x, unsigned& rel_y) const {
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unsigned abs_x = pos_x;
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unsigned abs_y = pos_y;
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if (use_cursor) {
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CGA::getCursor(abs_x, abs_y);
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}
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rel_x = Math::min(Math::max(abs_x, from_col), to_col - 1) - from_col;
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rel_y = Math::min(Math::max(abs_y, from_row), to_row - 1) - from_row;
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}
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void TextWindow::setPos(int rel_x, int rel_y) {
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int x = rel_x < 0 ? rel_x + to_col - from_col : rel_x;
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int y = rel_y < 0 ? rel_y + to_row - from_row : rel_y;
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if (x >= 0 && y >= 0) {
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setPos(static_cast<unsigned>(x), static_cast<unsigned>(y));
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}
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}
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void TextWindow::getPos(int& rel_x, int& rel_y) const {
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unsigned x;
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unsigned y;
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getPos(x, y);
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rel_x = static_cast<int>(x);
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rel_y = static_cast<int>(y);
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}
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void TextWindow::print(const char* str, size_t length, CGA::Attribute attrib) {
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// Get position
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unsigned abs_x = pos_x;
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unsigned abs_y = pos_y;
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if (use_cursor) {
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CGA::getCursor(abs_x, abs_y);
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}
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// Print each character
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while (length > 0) {
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switch (*str) {
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case '\n':
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abs_x = from_col;
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abs_y++;
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break;
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case '\r':
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abs_x = from_col;
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break;
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default:
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show(abs_x, abs_y, *str, attrib);
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abs_x++;
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if (abs_x >= to_col) {
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abs_x = from_col;
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abs_y++;
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}
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break;
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}
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str++;
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if (abs_y >= to_row) {
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scrollUp();
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abs_y--;
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}
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length--;
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}
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// Write position back
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if (use_cursor) {
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CGA::setCursor(abs_x, abs_y);
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} else {
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pos_x = abs_x;
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pos_y = abs_y;
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}
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}
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void TextWindow::reset(char character, CGA::Attribute attrib) {
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for (unsigned abs_y = from_row; abs_y < to_row; ++abs_y) {
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for (unsigned abs_x = from_col; abs_x < to_col; ++abs_x) {
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show(abs_x, abs_y, character, attrib);
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}
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}
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setPos(0, 0);
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}
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void TextWindow::scrollUp() const {
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for (unsigned y = from_row + 1; y < to_row; ++y) {
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for (unsigned x = from_col; x < to_col; ++x) {
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unsigned pos = (y * CGA::COLUMNS) + x;
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show(x, y - 1, CGA::TEXT_BUFFER_BASE[pos].character,
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CGA::TEXT_BUFFER_BASE[pos].attribute);
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}
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}
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for (unsigned x = from_col; x < to_col; ++x) {
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CGA::show(x, to_row - 1, ' ');
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}
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}
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