vertical scrolling
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@ -1 +1,4 @@
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Tyrel's Text Editor
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https://viewsourcecode.org/snaptoken/kilo/04.aTextViewer.html#vertical-scrolling
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22
tted.c
22
tted.c
@ -220,10 +220,20 @@ void abFree(struct abuf *ab) {
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/** output */
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void editorScroll() {
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if (E.cy < E.rowoff){
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E.rowoff = E.cy;
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}
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if (E.cy >= E.rowoff + E.screenrows) {
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E.rowoff = E.cy - E.screenrows +1;
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}
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}
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void editorDrawRows(struct abuf *ab) {
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int y;
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for (y = 0; y < E.screenrows; y++) {
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if (y >= E.numrows) { // Draw rows after buffer
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int filerow = y + E.rowoff;
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if (filerow >= E.numrows) { // Draw rows after buffer
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if (E.numrows == 0 && y == E.screenrows / 3) {
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char welcome[80];
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int welcomelen = snprintf(welcome, sizeof welcome, "Tyrel Text Editor Deluxe -- version %s",
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@ -240,9 +250,9 @@ void editorDrawRows(struct abuf *ab) {
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abAppend(ab, "~", 1);
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}
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} else { // draw buffer
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int len = E.row[y].size;
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int len = E.row[filerow].size;
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if (len > E.screencols) len = E.screencols; // truncate if further than columns
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abAppend(ab, E.row[y].chars, len);
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abAppend(ab, E.row[filerow].chars, len);
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}
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abAppend(ab, "\x1b[K", 3);
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@ -253,13 +263,15 @@ void editorDrawRows(struct abuf *ab) {
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}
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void editorRefreshScreen() {
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editorScroll();
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struct abuf ab = ABUF_INIT;
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abAppend(&ab, "\x1b[?25l", 6);
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abAppend(&ab, "\x1b[H", 3); // Cursor Position home
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editorDrawRows(&ab);
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char buf[32];
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snprintf(buf, sizeof(buf), "\x1b[%d;%dH", E.cy + 1, E.cx + 1);
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snprintf(buf, sizeof(buf), "\x1b[%d;%dH", (E.cy - E.rowoff) +1, E.cx + 1);
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abAppend(&ab, buf, strlen(buf));
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abAppend(&ab, "\x1b[?25h", 6);
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@ -287,7 +299,7 @@ void editorMoveCursor(int key) {
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}
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break;
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case ARROW_DOWN:
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if (E.cy != E.screenrows - 1) {
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if (E.cy != E.numrows) {
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E.cy++;
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}
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break;
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