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edit.js: caret row highlighter

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This commit is contained in:
minjaesong
2021-04-19 17:06:58 +09:00
parent aede935250
commit 1668211782
1 changed files with 30 additions and 11 deletions
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41
assets/disk0/tvdos/bin/edit.js
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@@ -10,8 +10,10 @@ const COL_SUPERTEXT = 239;
const COL_DIMTEXT = 249;
const COL_LNUMBACK = 18;
const COL_LNUMFORE = 253;
const COL_CARET_ROW = 81;
const PAINT_START_X = 5;
const PAINT_START_Y = 2;
const BIG_STRIDE = 32;
let filename = undefined;
@@ -53,6 +55,7 @@ function drawInit() {
paintHeight = windowHeight - PAINT_START_Y + 1;
scrollPeek = Math.ceil((paintHeight / 7));
}
const scrollHorPeek = 1; // to accommodate the scroll indicator
function reset_status() {
textbuffer = [""];
@@ -160,13 +163,16 @@ function drawMenubarBase(index) {
}
function drawTextLine(paintRow) {
if (paintRow < 0 || paintRow >= paintHeight) return;
let theRealLine = scroll + paintRow
con.curs_set(0);
con.color_pair(COL_TEXT, COL_BACK);
con.color_pair(COL_TEXT, (theRealLine == cursorRow) ? COL_CARET_ROW : COL_BACK);
for (let x = 0; x < paintWidth; x++) {
let text = textbuffer[scroll + paintRow];
let text = textbuffer[theRealLine];
let charCode =
// nonexisting text row
(undefined === textbuffer[scroll + paintRow]) ? 0 :
(undefined === textbuffer[theRealLine]) ? 0 :
// left scroll indicator
(x == 0 && scrollHor > 0) ? 17 :
// right scroll indicator
@@ -316,13 +322,21 @@ function cursorMoveRelative(odx, ody) {
// update horizontal scroll stats
if (dx != 0) {
if (nx > paintWidth) {
scrollHor += (nx - paintWidth);
nx = paintWidth;
let stride = paintWidth - 1;
if (nx > stride) {
scrollHor += nx - stride;
nx = stride;
}
else if (nx < 0) {
scrollHor += nx; // plus-assigning because nx is less than zero
nx = 0;
else if (nx < 0 + scrollHorPeek) {
scrollHor += nx - scrollHorPeek; // nx is less than zero
nx = 1;
// scroll to the left?
if (scrollHor <= -1) {
scrollHor = 0;
nx = 0;
}
}
}
@@ -355,6 +369,11 @@ function cursorMoveRelative(odx, ody) {
else if (oldScrollHor != scrollHor) {
drawTextLine(ny);
}
// remove old caret highlights
if (dy != 0 && COL_CARET_ROW !== undefined) {
drawTextLine(cursorRow - dy);
drawTextLine(cursorRow);
}
drawLnCol(); gotoText();
}
@@ -419,10 +438,10 @@ while (!exit) {
cursorMoveRelative(0, paintHeight - 1);
}
else if (key == con.KEY_HOME) {
cursorMoveRelative(-Number.MAX_SAFE_INTEGER, 0);
cursorMoveRelative(-BIG_STRIDE, 0);
}
else if (key == con.KEY_END) {
cursorMoveRelative(Number.MAX_SAFE_INTEGER, 0);
cursorMoveRelative(BIG_STRIDE, 0);
}
else if (key >= 32 && key < 128) { // printables (excludes \n)
appendText(key); drawLnCol(); gotoText();