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Adobe Spectrum - ColorWheel
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this.updateCenter()); } updateCenter() { const rect = this.wheel.getBoundingClientRect(); this.centerX = rect.left + rect.width / 2; this.centerY = rect.top + rect.height / 2; } bindEvents() { this.wheel.addEventListener('mousedown', this.handleMouseDown.bind(this)); this.wheel.addEventListener('touchstart', this.handleTouchStart.bind(this)); this.wheel.addEventListener('keydown', this.handleKeyDown.bind(this)); this.wheel.setAttribute('tabindex', '0'); document.addEventListener('mousemove', this.handleMouseMove.bind(this)); document.addEventListener('mouseup', this.handleMouseUp.bind(this)); document.addEventListener('touchmove', this.handleTouchMove.bind(this)); document.addEventListener('touchend', this.handleTouchEnd.bind(this)); } handleMouseDown(e) { if (this.options.disabled) return; e.preventDefault(); this.startDrag(e.clientX, e.clientY); } handleTouchStart(e) { if (this.options.disabled) return; e.preventDefault(); const touch = e.touches[0]; this.startDrag(touch.clientX, touch.clientY); } handleMouseMove(e) { if (!this.isDragging) return; e.preventDefault(); this.updateFromPointer(e.clientX, e.clientY); } handleTouchMove(e) { if (!this.isDragging) return; e.preventDefault(); const touch = e.touches[0]; this.updateFromPointer(touch.clientX, touch.clientY); } handleMouseUp() { this.endDrag(); } handleTouchEnd() { this.endDrag(); } handleKeyDown(e) { if (this.options.disabled) return; let delta = 0; switch (e.key) { case 'ArrowLeft': case 'ArrowDown': delta = -5; break; case 'ArrowRight': case 'ArrowUp': delta = 5; break; case 'Home': this.setHue(0); e.preventDefault(); return; case 'End': this.setHue(360); e.preventDefault(); return; } if (delta !== 0) { this.setHue(this.hue + delta); e.preventDefault(); } } startDrag(x, y) { this.isDragging = true; this.thumb.style.cursor = 'grabbing'; this.updateCenter(); this.updateFromPointer(x, y); } endDrag() { if (!this.isDragging) return; this.isDragging = false; this.thumb.style.cursor = 'grab'; if (this.options.onChangeEnd) { this.options.onChangeEnd(this.getColorValue()); } } updateFromPointer(x, y) { const dx = x - this.centerX; const dy = y - this.centerY; const angle = Math.atan2(dy, dx); const hue = ((angle * 180 / Math.PI) + 90 + 360) % 360; this.setHue(hue); } setHue(hue) { this.hue = Math.max(0, Math.min(360, hue)); this.updateThumbPosition(); this.updateValue(); if (this.options.onChange) { this.options.onChange(this.getColorValue()); } } updateThumbPosition() { const angle = (this.hue - 90) * Math.PI / 180; const radius = (this.options.outerRadius + this.options.innerRadius) / 2; const x = Math.cos(angle) * radius; const y = Math.sin(angle) * radius; this.thumb.style.left = `${this.options.outerRadius + x}px`; this.thumb.style.top = `${this.options.outerRadius + y}px`; this.thumb.style.backgroundColor = `hsl(${this.hue}, 100%, 50%)`; } updateValue() { const colorValue = this.getColorValue(); if (this.valueElement) { this.valueElement.textContent = colorValue; } } getColorValue() { return `hsl(${Math.round(this.hue)}, 100%, 50%)`; } setDisabled(disabled) { this.options.disabled = disabled; this.wheel.classList.toggle('disabled', disabled); this.thumb.classList.toggle('disabled', disabled); } } // Initialize color wheels const colorWheel1 = new ColorWheel( document.getElementById('colorWheel1'), document.getElementById('colorThumb1'), document.getElementById('colorValue1') ); const colorWheel2 = new ColorWheel( document.getElementById('colorWheel2'), document.getElementById('colorThumb2'), document.getElementById('colorValue2'), { onChange: (value) => { document.getElementById('hueInput').value = Math.round(colorWheel2.hue); } } ); colorWheel2.setHue(120); // Hue input control document.getElementById('hueInput').addEventListener('input', (e) => { colorWheel2.setHue(parseInt(e.target.value) || 0); }); // Events demo const eventsLog = document.getElementById('eventsLog'); const colorWheel3 = new ColorWheel( document.getElementById('colorWheel3'), document.getElementById('colorThumb3'), document.getElementById('colorValue3'), { onChange: (value) => { document.getElementById('currentValue').textContent = value; eventsLog.innerHTML += `<div>onChange: ${value}</div>`; eventsLog.scrollTop = eventsLog.scrollHeight; }, onChangeEnd: (value) => { document.getElementById('finalValue').textContent = value; eventsLog.innerHTML += `<div>onChangeEnd: ${value}</div>`; eventsLog.scrollTop = eventsLog.scrollHeight; } } ); colorWheel3.setHue(240); // Disabled demo const colorWheel4 = new ColorWheel( document.getElementById('colorWheel4'), document.getElementById('colorThumb4'), null, { disabled: true } ); colorWheel4.setHue(80); document.getElementById('disableToggle').addEventListener('change', (e) => { colorWheel4.setDisabled(e.target.checked); }); // Custom labeling demo const colorWheel5 = new ColorWheel( document.getElementById('colorWheel5'), document.getElementById('colorThumb5'), document.getElementById('colorValue5') ); colorWheel5.setHue(300); // Add ARIA attributes document.querySelectorAll('.color-wheel').forEach(wheel => { wheel.setAttribute('role', 'slider'); wheel.setAttribute('aria-valuemin', '0'); wheel.setAttribute('aria-valuemax', '360'); wheel.setAttribute('aria-label', 'Hue'); }); // Update ARIA values function updateAriaValue(wheel, hue) { wheel.setAttribute('aria-valuenow', Math.round(hue)); wheel.setAttribute('aria-valuetext', `${Math.round(hue)} degrees`); } // Add to existing color wheels [colorWheel1, colorWheel2, colorWheel3, colorWheel4, colorWheel5].forEach((cw, index) => { const originalSetHue = cw.setHue.bind(cw); cw.setHue = function(hue) { originalSetHue(hue); updateAriaValue(cw.wheel, hue); }; }); </script></body></html>' width="100%" height="1200" frameborder="0" sandbox="allow-scripts allow-same-origin allow-popups">