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ALPHA STAGE!
No bugs have been identified in the code as of now. Also, there are more features to be implemented but the essential functionalities are already there.
Description: Implemented via JFrame GUI: character insertion/deletion (utilizing doubly-linked-lists constructed of ArrayLists), cursor-reposition (w/ left/right arrow-keys), line-wrap, undo/redo (utilizing stacks for edit-tracking), persistent storage.
Practice mission: Constructing LinkedLists out of ArrayLists; coordinating between GUI and behind-the-scenes; the GUI itself; user-input processing; OOP; persistent-storage management; stacks (for undo/redo)

Undo key-combination: Ctrl+Z (Windows/Linux) or Command+Z (macOS)
Redo key-combination: Ctrl+Y (Windows/Linux) or Command+Y (macOS)

To do: implementing word-wrapping (not just general line-wrapping), adding features for down/up arrow key, changing the cursor-position in response to mouse actions, having the GUI only redraw the line, not the whole document

Most of the project was developed on September 6-11, 18, 23, and 26, 2025.

Illustration of some text-editor code components (GitHub Pages): https://seohyun-hwang.github.io/homepage//imageHTML/textEditorJavaIllustration-09.26.2025.html

Thank you for your attention.
~ Seohyun

About

ALPHA STAGE! Implemented in Java: JFrame GUI, character insertion/deletion, DoublyLinkedList, line-wrapping, persistent storage.

Topics

doubly-linked-listguijavajframeline-wrappersistent-storagetext-editor

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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ALPHA STAGE!

No bugs have been identified in the code as of now. Also, there are more features to be implemented but the essential functionalities are already there.
Description: Implemented via JFrame GUI: character insertion/deletion (utilizing doubly-linked-lists constructed of ArrayLists), cursor-reposition (w/ left/right arrow-keys), line-wrap, undo/redo (utilizing stacks for edit-tracking), persistent storage.
Practice mission: Constructing LinkedLists out of ArrayLists; coordinating between GUI and behind-the-scenes; the GUI itself; user-input processing; OOP; persistent-storage management; stacks (for undo/redo)
Undo key-combination: Ctrl+Z (Windows/Linux) or Command+Z (macOS)

Redo key-combination: Ctrl+Y (Windows/Linux) or Command+Y (macOS)
To do: implementing word-wrapping (not just general line-wrapping), adding features for down/up arrow key, changing the cursor-position in response to mouse actions, having the GUI only redraw the line, not the whole document
Most of the project was developed on September 6-11, 18, 23, and 26, 2025.
Illustration of some text-editor code components (GitHub Pages):
https://seohyun-hwang.github.io/homepage//imageHTML/textEditorJavaIllustration-09.26.2025.html
Thank you for your attention.

~ Seohyun
About
ALPHA STAGE! Implemented in Java: JFrame GUI, character insertion/deletion, DoublyLinkedList, line-wrapping, persistent storage.
Topics
doubly-linked-listguijavajframeline-wrappersistent-storagetext-editor
Resources
Readme
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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ALPHA STAGE!

No bugs have been identified in the code as of now. Also, there are more features to be implemented but the essential functionalities are already there.
Description: Implemented via JFrame GUI: character insertion/deletion (utilizing doubly-linked-lists constructed of ArrayLists), cursor-reposition (w/ left/right arrow-keys), line-wrap, undo/redo (utilizing stacks for edit-tracking), persistent storage.
Practice mission: Constructing LinkedLists out of ArrayLists; coordinating between GUI and behind-the-scenes; the GUI itself; user-input processing; OOP; persistent-storage management; stacks (for undo/redo)
Undo key-combination: Ctrl+Z (Windows/Linux) or Command+Z (macOS)

Redo key-combination: Ctrl+Y (Windows/Linux) or Command+Y (macOS)
To do: implementing word-wrapping (not just general line-wrapping), adding features for down/up arrow key, changing the cursor-position in response to mouse actions, having the GUI only redraw the line, not the whole document
Most of the project was developed on September 6-11, 18, 23, and 26, 2025.
Illustration of some text-editor code components (GitHub Pages):
https://seohyun-hwang.github.io/homepage//imageHTML/textEditorJavaIllustration-09.26.2025.html
Thank you for your attention.

~ Seohyun
About
ALPHA STAGE! Implemented in Java: JFrame GUI, character insertion/deletion, DoublyLinkedList, line-wrapping, persistent storage.
Topics
doubly-linked-listguijavajframeline-wrappersistent-storagetext-editor
Resources
Readme
Activity
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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ALPHA STAGE!

No bugs have been identified in the code as of now. Also, there are more features to be implemented but the essential functionalities are already there.
Description: Implemented via JFrame GUI: character insertion/deletion (utilizing doubly-linked-lists constructed of ArrayLists), cursor-reposition (w/ left/right arrow-keys), line-wrap, undo/redo (utilizing stacks for edit-tracking), persistent storage.
Practice mission: Constructing LinkedLists out of ArrayLists; coordinating between GUI and behind-the-scenes; the GUI itself; user-input processing; OOP; persistent-storage management; stacks (for undo/redo)
Undo key-combination: Ctrl+Z (Windows/Linux) or Command+Z (macOS)

Redo key-combination: Ctrl+Y (Windows/Linux) or Command+Y (macOS)
To do: implementing word-wrapping (not just general line-wrapping), adding features for down/up arrow key, changing the cursor-position in response to mouse actions, having the GUI only redraw the line, not the whole document
Most of the project was developed on September 6-11, 18, 23, and 26, 2025.
Illustration of some text-editor code components (GitHub Pages):
https://seohyun-hwang.github.io/homepage//imageHTML/textEditorJavaIllustration-09.26.2025.html
Thank you for your attention.

~ Seohyun
About
ALPHA STAGE! Implemented in Java: JFrame GUI, character insertion/deletion, DoublyLinkedList, line-wrapping, persistent storage.
Topics
doubly-linked-listguijavajframeline-wrappersistent-storagetext-editor
Resources
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Activity
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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saveProgress.txt
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textEditor3java.iml
Repository files navigation
ALPHA STAGE!

No bugs have been identified in the code as of now. Also, there are more features to be implemented but the essential functionalities are already there.
Description: Implemented via JFrame GUI: character insertion/deletion (utilizing doubly-linked-lists constructed of ArrayLists), cursor-reposition (w/ left/right arrow-keys), line-wrap, undo/redo (utilizing stacks for edit-tracking), persistent storage.
Practice mission: Constructing LinkedLists out of ArrayLists; coordinating between GUI and behind-the-scenes; the GUI itself; user-input processing; OOP; persistent-storage management; stacks (for undo/redo)
Undo key-combination: Ctrl+Z (Windows/Linux) or Command+Z (macOS)

Redo key-combination: Ctrl+Y (Windows/Linux) or Command+Y (macOS)
To do: implementing word-wrapping (not just general line-wrapping), adding features for down/up arrow key, changing the cursor-position in response to mouse actions, having the GUI only redraw the line, not the whole document
Most of the project was developed on September 6-11, 18, 23, and 26, 2025.
Illustration of some text-editor code components (GitHub Pages):
https://seohyun-hwang.github.io/homepage//imageHTML/textEditorJavaIllustration-09.26.2025.html
Thank you for your attention.

~ Seohyun
About
ALPHA STAGE! Implemented in Java: JFrame GUI, character insertion/deletion, DoublyLinkedList, line-wrapping, persistent storage.
Topics
doubly-linked-listguijavajframeline-wrappersistent-storagetext-editor
Resources
Readme
Activity
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0 watching
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Repository files navigation
ALPHA STAGE!

No bugs have been identified in the code as of now. Also, there are more features to be implemented but the essential functionalities are already there.
Description: Implemented via JFrame GUI: character insertion/deletion (utilizing doubly-linked-lists constructed of ArrayLists), cursor-reposition (w/ left/right arrow-keys), line-wrap, undo/redo (utilizing stacks for edit-tracking), persistent storage.
Practice mission: Constructing LinkedLists out of ArrayLists; coordinating between GUI and behind-the-scenes; the GUI itself; user-input processing; OOP; persistent-storage management; stacks (for undo/redo)
Undo key-combination: Ctrl+Z (Windows/Linux) or Command+Z (macOS)

Redo key-combination: Ctrl+Y (Windows/Linux) or Command+Y (macOS)
To do: implementing word-wrapping (not just general line-wrapping), adding features for down/up arrow key, changing the cursor-position in response to mouse actions, having the GUI only redraw the line, not the whole document
Most of the project was developed on September 6-11, 18, 23, and 26, 2025.
Illustration of some text-editor code components (GitHub Pages):
https://seohyun-hwang.github.io/homepage//imageHTML/textEditorJavaIllustration-09.26.2025.html
Thank you for your attention.

~ Seohyun
About
ALPHA STAGE! Implemented in Java: JFrame GUI, character insertion/deletion, DoublyLinkedList, line-wrapping, persistent storage.
Topics
doubly-linked-listguijavajframeline-wrappersistent-storagetext-editor
Resources
Readme
Activity
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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saveProgress.txt
textEditor3java.iml
textEditor3java.iml
Repository files navigation
ALPHA STAGE!

No bugs have been identified in the code as of now. Also, there are more features to be implemented but the essential functionalities are already there.
Description: Implemented via JFrame GUI: character insertion/deletion (utilizing doubly-linked-lists constructed of ArrayLists), cursor-reposition (w/ left/right arrow-keys), line-wrap, undo/redo (utilizing stacks for edit-tracking), persistent storage.
Practice mission: Constructing LinkedLists out of ArrayLists; coordinating between GUI and behind-the-scenes; the GUI itself; user-input processing; OOP; persistent-storage management; stacks (for undo/redo)
Undo key-combination: Ctrl+Z (Windows/Linux) or Command+Z (macOS)

Redo key-combination: Ctrl+Y (Windows/Linux) or Command+Y (macOS)
To do: implementing word-wrapping (not just general line-wrapping), adding features for down/up arrow key, changing the cursor-position in response to mouse actions, having the GUI only redraw the line, not the whole document
Most of the project was developed on September 6-11, 18, 23, and 26, 2025.
Illustration of some text-editor code components (GitHub Pages):
https://seohyun-hwang.github.io/homepage//imageHTML/textEditorJavaIllustration-09.26.2025.html
Thank you for your attention.

~ Seohyun
About
ALPHA STAGE! Implemented in Java: JFrame GUI, character insertion/deletion, DoublyLinkedList, line-wrapping, persistent storage.
Topics
doubly-linked-listguijavajframeline-wrappersistent-storagetext-editor
Resources
Readme
Activity
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Repository files navigation
ALPHA STAGE!

No bugs have been identified in the code as of now. Also, there are more features to be implemented but the essential functionalities are already there.
Description: Implemented via JFrame GUI: character insertion/deletion (utilizing doubly-linked-lists constructed of ArrayLists), cursor-reposition (w/ left/right arrow-keys), line-wrap, undo/redo (utilizing stacks for edit-tracking), persistent storage.
Practice mission: Constructing LinkedLists out of ArrayLists; coordinating between GUI and behind-the-scenes; the GUI itself; user-input processing; OOP; persistent-storage management; stacks (for undo/redo)
Undo key-combination: Ctrl+Z (Windows/Linux) or Command+Z (macOS)

Redo key-combination: Ctrl+Y (Windows/Linux) or Command+Y (macOS)
To do: implementing word-wrapping (not just general line-wrapping), adding features for down/up arrow key, changing the cursor-position in response to mouse actions, having the GUI only redraw the line, not the whole document
Most of the project was developed on September 6-11, 18, 23, and 26, 2025.
Illustration of some text-editor code components (GitHub Pages):
https://seohyun-hwang.github.io/homepage//imageHTML/textEditorJavaIllustration-09.26.2025.html
Thank you for your attention.

~ Seohyun
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ALPHA STAGE! Implemented in Java: JFrame GUI, character insertion/deletion, DoublyLinkedList, line-wrapping, persistent storage.
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doubly-linked-listguijavajframeline-wrappersistent-storagetext-editor
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