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edit.js: hor/vert scroll works even when cursorCol != cursoringCol

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This commit is contained in:
minjaesong
2021-04-22 10:13:23 +09:00
parent 823ca55496
commit 4066ddd7a5
1 changed files with 43 additions and 31 deletions
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74
assets/disk0/tvdos/bin/edit.js
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@@ -162,31 +162,32 @@ function drawMenubarBase(index) {
});
}
function drawTextLine(paintRow) {
function drawTextLineAbsolute(rowNumber, paintOffsetX) {
let paintRow = rowNumber - scroll;
if (paintRow < 0 || paintRow >= paintHeight) return;
let theRealLine = scroll + paintRow
con.curs_set(0);
con.color_pair(COL_TEXT, (theRealLine == cursorRow) ? COL_CARET_ROW : COL_BACK);
con.color_pair(COL_TEXT, (rowNumber == cursorRow) ? COL_CARET_ROW : COL_BACK);
for (let x = 0; x < paintWidth; x++) {
let text = textbuffer[theRealLine];
let text = textbuffer[rowNumber];
let charCode =
// nonexisting text row
(undefined === textbuffer[theRealLine]) ? 0 :
(undefined === textbuffer[rowNumber]) ? 0 :
// left scroll indicator
(x == 0 && scrollHor > 0) ? 17 :
(x == 0 && paintOffsetX > 0) ? 17 :
// right scroll indicator
(x == paintWidth - 1 && x + scrollHor + 1 < text.length) ? 16 :
(x == paintWidth - 1 && x + paintOffsetX + 1 < text.length) ? 16 :
// plain text
text.charCodeAt(x + scrollHor); // NaN will be returned for nonexisting char but con.addch will cast NaN into zero
text.charCodeAt(x + paintOffsetX); // NaN will be returned for nonexisting char but con.addch will cast NaN into zero
con.mvaddch(PAINT_START_Y + paintRow, PAINT_START_X + x, charCode);
}
}
function drawTextbuffer() {
for (let k = 0; k < paintHeight; k++) {
drawTextLine(k)
for (let k = scroll; k < scroll + paintHeight; k++) {
drawTextLineAbsolute(k, (k == cursorRow) ? scrollHor : 0);
}
gotoText();
}
@@ -203,7 +204,7 @@ function displayBulletin(text) {
}
function dismissBulletin() {
bulletinShown = false;
drawTextLine(paintHeight - 2);
drawTextLineAbsolute(scroll + paintHeight - 2, scrollHor);
gotoText();
}
@@ -252,7 +253,7 @@ function appendLine() {
// reset horizontal scroll before going to the next line
scrollHor = 0;
drawTextLine(cursorRow - scroll);
drawTextLineAbsolute(cursorRow, scrollHor);
// go to the next line
cursorRow += 1;
@@ -287,25 +288,35 @@ function backspaceOnce() {
function cursorMoveRelative(odx, ody) {
//gotoText(); // update cursor pos
let dx = odx;// + (cursoringCol - cursorCol);
let dx = odx;
let dy = ody;
let oldScroll = scroll;
let oldScrollHor = scrollHor;
// clamp dx/dy
// clamp dy
if (cursorRow + dy > textbuffer.length - 1)
dy = (textbuffer.length - 1) - cursorRow;
else if (cursorRow + dy < 0)
dy = -cursorRow;
// set new dx if destination col is outside of the line
if (cursorCol + dx > textbuffer[cursorRow + dy].length)
dx = textbuffer[cursorRow].length - cursorCol;
let nextRow = cursorRow + dy;
// clamp dx
if (cursorCol + dx > textbuffer[nextRow].length)
dx = (textbuffer[nextRow].length) - cursorCol;
else if (cursorCol + dx < 0)
dx = -cursorCol;
// update horizontal scroll stats
let nextCol = cursorCol + dx;
// set dx to the value that makes cursor to follow the minof(textlen, cursoringCol)
if (cursoringCol != nextCol) {
dx = Math.min(cursoringCol, textbuffer[nextRow].length) - cursorCol;
}
nextCol = cursorCol + dx;
// update horizontal scroll stats
if (dx != 0) {
let visible = paintWidth - 1 - scrollHorPeek;
@@ -322,7 +333,6 @@ function cursorMoveRelative(odx, ody) {
}
// update vertical scroll stats
let nextRow = cursorRow + dy;
if (dy != 0) {
let visible = paintHeight - 1 - scrollPeek;
@@ -340,7 +350,6 @@ function cursorMoveRelative(odx, ody) {
// move editor cursor
cursoringCol += dx;
cursorRow = nextRow;
cursorCol = nextCol;
@@ -351,13 +360,10 @@ function cursorMoveRelative(odx, ody) {
if (oldScroll != scroll) {
drawTextbuffer(); drawLineNumbers();
}
else if (oldScrollHor != scrollHor) {
drawTextLine(cursorRow - scroll);
}
// remove old caret highlights
if (dy != 0 && COL_CARET_ROW !== undefined) {
drawTextLine(cursorRow - dy);
drawTextLine(cursorRow);
// remove caret highlights and reset horizontal scrolling from the old line
else if (dy != 0 || oldScrollHor != scrollHor) {
drawTextLineAbsolute(cursorRow, scrollHor);
if (dy != 0) drawTextLineAbsolute(cursorRow - dy, 0);
}
drawLnCol(); gotoText();
@@ -371,7 +377,7 @@ function cursorHorAbsolute(pos) {
cursorCol = position;
scrollHor = position - paintWidth + 2;
if (scrollHor < 0) scrollHor = 0;
drawTextLine(cursorRow - scroll);
drawTextLineAbsolute(cursorRow, scrollHor);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
@@ -405,16 +411,20 @@ while (!exit) {
appendLine(); drawLineNumbers(); drawLnCol(); gotoText();
}
else if (key == con.KEY_LEFT) {
cursoringCol = cursorCol - 1;
if (cursoringCol < 0) cursoringCol = 0;
cursorMoveRelative(-1,0);
}
else if (key == con.KEY_RIGHT) {
cursoringCol = cursorCol + 1;
if (cursoringCol > textbuffer[cursorRow].length) cursoringCol = textbuffer[cursorRow].length;
cursorMoveRelative(1,0);
}
else if (key == con.KEY_UP) {
cursorMoveRelative(-BIG_STRIDE,-1);
cursorMoveRelative(0,-1);
}
else if (key == con.KEY_DOWN) {
cursorMoveRelative(-BIG_STRIDE,1);
cursorMoveRelative(0,1);
}
else if (key == con.KEY_PAGE_UP) {
cursorMoveRelative(0, -paintHeight + 1);
@@ -423,13 +433,15 @@ while (!exit) {
cursorMoveRelative(0, paintHeight - 1);
}
else if (key == con.KEY_HOME) {
cursoringCol = 0;
cursorMoveRelative(-BIG_STRIDE, 0);
}
else if (key == con.KEY_END) {
cursoringCol = textbuffer[cursorRow].length;
cursorMoveRelative(BIG_STRIDE, 0);
}
else if (key >= 32 && key < 128) { // printables (excludes \n)
appendText(key); cursorMoveRelative(1,0); drawTextLine(cursorRow - scroll);
appendText(key); cursorMoveRelative(1,0); drawTextLineAbsolute(cursorRow, scrollHor);
}
}