Add zoom in/out buttons to every website
// ==UserScript==
// @name Universal Zoom Control
// @namespace http://tampermonkey.net/
// @version 1.1
// @description Add zoom in/out buttons to every website
// @author You
// @match *://*/*
// @grant none
// @run-at document-start
// ==/UserScript==
(function() {
'use strict';
let currentZoom = 1.0;
let zoomContainer = null;
let isHidden = false;
let transparency = 0.9; // Default transparency (0.1 = very transparent, 1.0 = opaque)
// Create zoom controls
function createZoomControls() {
// Create container
zoomContainer = document.createElement('div');
zoomContainer.id = 'zoom-controls';
updateContainerStyle();
// Create zoom out button
const zoomOutBtn = document.createElement('button');
zoomOutBtn.innerHTML = '−';
zoomOutBtn.title = 'Zoom Out (Ctrl + -)';
zoomOutBtn.style.cssText = `
background: #4CAF50;
color: white;
border: none;
width: 32px;
height: 32px;
border-radius: 6px;
cursor: pointer;
font-size: 18px;
font-weight: bold;
margin-right: 4px;
transition: background 0.2s;
`;
zoomOutBtn.onmouseover = () => zoomOutBtn.style.background = '#45a049';
zoomOutBtn.onmouseout = () => zoomOutBtn.style.background = '#4CAF50';
zoomOutBtn.onclick = () => zoomOut();
// Create zoom level display
const zoomLevel = document.createElement('span');
zoomLevel.id = 'zoom-level';
zoomLevel.style.cssText = `
color: white;
font-size: 12px;
font-weight: bold;
margin: 0 8px;
min-width: 35px;
text-align: center;
display: inline-block;
`;
zoomLevel.textContent = '100%';
// Create zoom in button
const zoomInBtn = document.createElement('button');
zoomInBtn.innerHTML = '+';
zoomInBtn.title = 'Zoom In (Ctrl + +)';
zoomInBtn.style.cssText = `
background: #2196F3;
color: white;
border: none;
width: 32px;
height: 32px;
border-radius: 6px;
cursor: pointer;
font-size: 18px;
font-weight: bold;
margin-left: 4px;
transition: background 0.2s;
`;
zoomInBtn.onmouseover = () => zoomInBtn.style.background = '#1976D2';
zoomInBtn.onmouseout = () => zoomInBtn.style.background = '#2196F3';
zoomInBtn.onclick = () => zoomIn();
// Create transparency slider
const transparencyContainer = document.createElement('div');
transparencyContainer.style.cssText = `
margin-top: 8px;
padding-top: 8px;
border-top: 1px solid rgba(255, 255, 255, 0.2);
display: flex;
align-items: center;
gap: 6px;
`;
const transparencyLabel = document.createElement('span');
transparencyLabel.textContent = '👁';
transparencyLabel.style.cssText = `
color: white;
font-size: 12px;
`;
const transparencySlider = document.createElement('input');
transparencySlider.type = 'range';
transparencySlider.min = '0.3';
transparencySlider.max = '1.0';
transparencySlider.step = '0.1';
transparencySlider.value = transparency;
transparencySlider.style.cssText = `
width: 60px;
height: 4px;
background: rgba(255, 255, 255, 0.3);
outline: none;
border-radius: 2px;
`;
transparencySlider.oninput = (e) => {
transparency = parseFloat(e.target.value);
updateContainerStyle();
saveSettings();
};
transparencyContainer.appendChild(transparencyLabel);
transparencyContainer.appendChild(transparencySlider);
// Create hide/show toggle button
const toggleBtn = document.createElement('button');
toggleBtn.innerHTML = '👁';
toggleBtn.title = 'Hide/Show Controls (Alt + H)';
toggleBtn.style.cssText = `
background: #9C27B0;
color: white;
border: none;
width: 32px;
height: 32px;
border-radius: 6px;
cursor: pointer;
font-size: 12px;
margin-left: 8px;
transition: background 0.2s;
`;
toggleBtn.onmouseover = () => toggleBtn.style.background = '#7B1FA2';
toggleBtn.onmouseout = () => toggleBtn.style.background = '#9C27B0';
toggleBtn.onclick = () => toggleVisibility();
// Create reset button
const resetBtn = document.createElement('button');
resetBtn.innerHTML = '⌂';
resetBtn.title = 'Reset Zoom (Ctrl + 0)';
resetBtn.style.cssText = `
background: #FF9800;
color: white;
border: none;
width: 32px;
height: 32px;
border-radius: 6px;
cursor: pointer;
font-size: 14px;
margin-left: 8px;
transition: background 0.2s;
`;
resetBtn.onmouseover = () => resetBtn.style.background = '#F57C00';
resetBtn.onmouseout = () => resetBtn.style.background = '#FF9800';
resetBtn.onclick = () => resetZoom();
// Create main controls container
const mainControls = document.createElement('div');
mainControls.id = 'main-controls';
mainControls.style.cssText = `
display: flex;
align-items: center;
`;
// Assemble main controls
mainControls.appendChild(zoomOutBtn);
mainControls.appendChild(zoomLevel);
mainControls.appendChild(zoomInBtn);
mainControls.appendChild(resetBtn);
mainControls.appendChild(toggleBtn);
// Assemble all controls
zoomContainer.appendChild(mainControls);
zoomContainer.appendChild(transparencyContainer);
// Add to page
document.body.appendChild(zoomContainer);
// Load saved settings
loadSettings();
// Make draggable
makeDraggable(zoomContainer);
}
// Update container transparency and style
function updateContainerStyle() {
if (!zoomContainer) return;
const bgAlpha = transparency * 0.8; // Background is slightly more transparent
zoomContainer.style.cssText = `
position: fixed;
top: 20px;
right: 20px;
z-index: 999999;
background: rgba(0, 0, 0, ${bgAlpha});
border-radius: 8px;
padding: 8px;
box-shadow: 0 4px 12px rgba(0, 0, 0, ${transparency * 0.3});
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
user-select: none;
backdrop-filter: blur(10px);
opacity: ${transparency};
transition: opacity 0.3s ease, transform 0.3s ease;
cursor: grab;
`;
// Apply hidden state if needed
if (isHidden) {
zoomContainer.style.transform = 'translateX(calc(100% - 40px))';
zoomContainer.style.opacity = '0.3';
} else {
zoomContainer.style.transform = 'translateX(0)';
}
}
// Toggle visibility
function toggleVisibility() {
isHidden = !isHidden;
updateContainerStyle();
saveSettings();
// Change toggle button appearance
const toggleBtn = zoomContainer.querySelector('button[title*="Hide/Show"]');
if (toggleBtn) {
toggleBtn.innerHTML = isHidden ? '👀' : '👁';
toggleBtn.title = isHidden ? 'Show Controls (Alt + H)' : 'Hide/Show Controls (Alt + H)';
}
}
// Zoom functions
function zoomIn() {
currentZoom = Math.min(currentZoom + 0.1, 3.0);
applyZoom();
}
function zoomOut() {
currentZoom = Math.max(currentZoom - 0.1, 0.5);
applyZoom();
}
function resetZoom() {
currentZoom = 1.0;
applyZoom();
}
function applyZoom() {
document.body.style.zoom = currentZoom;
document.body.style.transform = `scale(${currentZoom})`;
document.body.style.transformOrigin = 'top left';
// Update zoom level display
const zoomLevelElement = document.getElementById('zoom-level');
if (zoomLevelElement) {
zoomLevelElement.textContent = Math.round(currentZoom * 100) + '%';
}
// Save zoom level and settings to localStorage
saveSettings();
}
// Save settings to localStorage
function saveSettings() {
try {
const settings = {
zoom: currentZoom,
transparency: transparency,
hidden: isHidden,
position: {
left: zoomContainer ? zoomContainer.style.left : '',
top: zoomContainer ? zoomContainer.style.top : '',
right: zoomContainer ? zoomContainer.style.right : ''
}
};
localStorage.setItem('userscript-zoom-settings', JSON.stringify(settings));
} catch (e) {
// Ignore localStorage errors
}
}
// Load saved settings
function loadSettings() {
try {
const savedSettings = localStorage.getItem('userscript-zoom-settings');
if (savedSettings) {
const settings = JSON.parse(savedSettings);
currentZoom = settings.zoom || 1.0;
transparency = settings.transparency || 0.9;
isHidden = settings.hidden || false;
// Apply zoom
applyZoom();
// Update transparency slider
const slider = zoomContainer.querySelector('input[type="range"]');
if (slider) slider.value = transparency;
// Apply position
if (settings.position && settings.position.left) {
zoomContainer.style.left = settings.position.left;
zoomContainer.style.top = settings.position.top;
zoomContainer.style.right = 'auto';
}
// Update container style with saved settings
updateContainerStyle();
// Update toggle button if hidden
if (isHidden) {
const toggleBtn = zoomContainer.querySelector('button[title*="Hide/Show"]');
if (toggleBtn) {
toggleBtn.innerHTML = '👀';
toggleBtn.title = 'Show Controls (Alt + H)';
}
}
}
} catch (e) {
// Ignore localStorage errors
}
}
// Make element draggable
function makeDraggable(element) {
let isDragging = false;
let dragOffset = { x: 0, y: 0 };
element.onmousedown = function(e) {
// Don't drag if clicking on interactive elements
if (e.target.tagName === 'INPUT' || e.target.tagName === 'BUTTON') {
return;
}
isDragging = true;
dragOffset.x = e.clientX - element.offsetLeft;
dragOffset.y = e.clientY - element.offsetTop;
element.style.cursor = 'grabbing';
e.preventDefault();
};
document.onmousemove = function(e) {
if (!isDragging) return;
const newX = e.clientX - dragOffset.x;
const newY = e.clientY - dragOffset.y;
// Keep within viewport bounds
const maxX = window.innerWidth - element.offsetWidth;
const maxY = window.innerHeight - element.offsetHeight;
element.style.left = Math.max(0, Math.min(newX, maxX)) + 'px';
element.style.top = Math.max(0, Math.min(newY, maxY)) + 'px';
element.style.right = 'auto';
// Save position
saveSettings();
};
document.onmouseup = function() {
isDragging = false;
element.style.cursor = 'grab';
};
element.style.cursor = 'grab';
}
// Keyboard shortcuts
function setupKeyboardShortcuts() {
document.addEventListener('keydown', function(e) {
if (e.ctrlKey || e.metaKey) {
switch(e.key) {
case '+':
case '=':
e.preventDefault();
zoomIn();
break;
case '-':
e.preventDefault();
zoomOut();
break;
case '0':
e.preventDefault();
resetZoom();
break;
}
}
// Alt + H for hide/show toggle
if (e.altKey && e.key.toLowerCase() === 'h') {
e.preventDefault();
toggleVisibility();
}
});
}
// Initialize when DOM is ready
function init() {
if (document.body) {
createZoomControls();
setupKeyboardShortcuts();
} else {
// Wait for body to be available
const observer = new MutationObserver(function(mutations) {
if (document.body) {
observer.disconnect();
createZoomControls();
setupKeyboardShortcuts();
}
});
observer.observe(document.documentElement, { childList: true, subtree: true });
}
}
// Start initialization
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', init);
} else {
init();
}
})();
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