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keep previous caret x location on pageup/down

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This commit is contained in:
John McLear 2020-12-29 16:55:51 +00:00
parent db26ea218c
commit 5cd4dc1af2
1 changed files with 42 additions and 0 deletions
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42
src/static/js/ace2_inner.js
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@ -2798,6 +2798,15 @@ function Ace2Inner() {
const isTypeForCmdKey = ((browser.safari || browser.chrome || browser.firefox) ? (type == 'keydown') : (type == 'keypress'));
let stopped = false;
// previousCharacterOffset is used for ensuring caret
// location is kept on up/pagedown events
let previousCharacterOffset;
if (rep.selEnd[1] > 0) {
previousCharacterOffset = rep.selEnd[1];
} else {
previousCharacterOffset = 0;
}
inCallStackIfNecessary('handleKeyEvent', function () {
if (type == 'keypress' || (isTypeForSpecialKey && keyCode == 13 /* return*/)) {
// in IE, special keys don't send keypress, the keydown does the action
@ -3068,16 +3077,49 @@ function Ace2Inner() {
// put the caret on the first line in the first position
rep.selStart = [0, 0];
rep.selEnd = [0, 0];
} else {
let line;
// need current character length of line
try {
line = rep.lines.atIndex(rep.selEnd[0]);
} catch (e) {
// silently fail, no big deal..
line = rep.lines.atIndex(visibleLineRange[1]);
}
const lineLength = line.width;
// Keep the X character offset on page down
if (previousCharacterOffset <= line.width) {
rep.selStart[1] = previousCharacterOffset;
rep.selEnd[1] = previousCharacterOffset;
}
}
}
if (isPageDown) {
top.console.log('prevcharoffset', previousCharacterOffset);
// go to the bottom of the last visible content
if (rep.selStart[0] === 0) {
rep.selStart[0] += visibleLineRange[1] - visibleLineRange[0] - 1;
rep.selEnd[0] += visibleLineRange[1] - visibleLineRange[0] - 1;
} else {
top.console.log('am here..', visibleLineRange);
let line;
// need current character length of line
try {
line = rep.lines.atIndex(rep.selEnd[0]);
} catch (e) {
// silently fail, no big deal..
line = rep.lines.atIndex(visibleLineRange[1]);
}
const lineLength = line.width;
// Keep the X character offset on page down
if (previousCharacterOffset <= line.width) {
rep.selStart[1] = previousCharacterOffset;
rep.selEnd[1] = previousCharacterOffset;
}
rep.selStart[0] = rep.selStart[0] + (visibleLineRange[1] - visibleLineRange[0]);
rep.selEnd[0] = rep.selEnd[0] + (visibleLineRange[1] - visibleLineRange[0]);
}