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LESS with horizontal scroll

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minjaesong
2020-11-13 21:31:40 +09:00
parent c3cc6f4d1a
commit ad00f02747
1 changed files with 22 additions and 7 deletions
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29
assets/tvdos/bin/less.js
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@@ -22,23 +22,28 @@ if (!fileOpened) {
}
let scroll = 0;
let pan = -1;
let termW = con.getmaxyx()[1];
let termH = con.getmaxyx()[0] - 1;
let buf = "";
let fileContent = filesystem.readAll(_G.shell.getCurrentDrive());
let key = -1;
let panSize = termW >> 1;
// initialise some helper variables
let lineToBytes = [0];
let maxPan = 0;
let maxPanCur = 0;
for (let i = 0; i < fileContent.length; i++) {
let char = fileContent.charCodeAt(i);
maxPanCur += 1;
if (char == 10 || char == 13) {
lineToBytes.push(i + 1);
if (maxPanCur > maxPan) maxPan = maxPanCur;
maxPanCur = 0;
}
}
serial.println(lineToBytes);
let startAddr = -1;
let paintCur = 0;
let cy = 1;
@@ -49,19 +54,21 @@ let repaint = function() {
con.move(1,1); con.clear();
startAddr = lineToBytes[scroll];
cy = 1; cx = 1; paintCur = 0;
cy = 1; cx = -pan; paintCur = 0;
while (cy <= termH) {
char = fileContent.charCodeAt(startAddr + paintCur);
if (isNaN(char)) break;
if (cy <= termH) {
con.move(cy, cx);
if (char != 10 && char != 13)
con.addch(char);
if (cx >= 0 && cx < termW) {
con.move(cy, cx);
if (char != 10 && char != 13)
con.addch(char);
}
cx += 1;
}
if (char == 10 || char == 13) {
cy += 1;
cx = 1;
cx = -pan;
}
paintCur += 1;
}
@@ -84,6 +91,14 @@ while (true) {
scroll += 1;
repaint();
}
/*left*/else if (key == 21 && pan > 0) {
pan -= panSize;
repaint();
}
/*right*/else if (key == 22 && pan < maxPan - termW) {
pan += panSize;
repaint();
}
}
con.move(termH + 1, 1);