293 lines
9.6 KiB
Vue
293 lines
9.6 KiB
Vue
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<template>
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<div :class="containerClass">
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<svg viewBox="0 0 100 100" role="slider" :width="size" :height="size" :tabindex="readonly || disabled ? -1 : tabindex" :aria-valuemin="min" :aria-valuemax="max" :aria-valuenow="modelValue" :aria-labelledby="ariaLabelledby" :aria-label="ariaLabel"
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@click="onClick" @keydown="onKeyDown" @mousedown="onMouseDown" @mouseup="onMouseUp" @touchstart="onTouchStart" @touchend="onTouchEnd">
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<path :d="rangePath" :stroke-width="strokeWidth" :stroke="rangeColor" class="p-knob-range"></path>
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<path :d="valuePath" :stroke-width="strokeWidth" :stroke="valueColor" class="p-knob-value"></path>
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<text v-if="showValue" :x="50" :y="57" text-anchor="middle" :fill="textColor" class="p-knob-text">{{valueToDisplay}}</text>
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</svg>
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</div>
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</template>
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<script>
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export default {
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name: 'Knob',
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emits: ['update:modelValue', 'change'],
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data() {
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return {
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radius: 40,
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midX: 50,
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midY: 50,
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minRadians: 4 * Math.PI / 3,
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maxRadians: -Math.PI / 3
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}
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},
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props: {
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modelValue: {
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type: Number,
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default: null
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},
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size: {
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type: Number,
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default: 100
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},
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disabled: {
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type: Boolean,
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default: false
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},
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readonly: {
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type: Boolean,
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default: false
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},
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step: {
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type: Number,
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default: 1
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},
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min: {
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type: Number,
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default: 0
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},
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max: {
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type: Number,
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default: 100
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},
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valueColor: {
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type: String,
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default: 'var(--primary-color, Black)'
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},
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rangeColor: {
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type: String,
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default: 'var(--surface-border, LightGray)'
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},
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textColor: {
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type: String,
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default: 'var(--text-color-secondary, Black)'
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},
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strokeWidth: {
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type: Number,
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default: 14
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},
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showValue: {
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type: Boolean,
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default: true
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},
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valueTemplate: {
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type: String,
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default: "{value}"
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},
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tabindex: {
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type: Number,
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default: 0
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},
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'aria-labelledby': {
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type: String,
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default: null
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},
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'aria-label': {
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type: String,
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default: null
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}
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},
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methods: {
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updateValue(offsetX, offsetY) {
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let dx = offsetX - this.size / 2;
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let dy = this.size / 2 - offsetY;
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let angle = Math.atan2(dy, dx);
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let start = -Math.PI / 2 - Math.PI / 6;
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this.updateModel(angle, start);
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},
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updateModel(angle, start) {
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let mappedValue;
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if (angle > this.maxRadians)
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mappedValue = this.mapRange(angle, this.minRadians, this.maxRadians, this.min, this.max);
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else if (angle < start)
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mappedValue = this.mapRange(angle + 2 * Math.PI, this.minRadians, this.maxRadians, this.min, this.max);
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else
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return;
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let newValue = Math.round((mappedValue - this.min) / this.step) * this.step + this.min;
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this.$emit('update:modelValue', newValue);
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this.$emit('change', newValue);
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},
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updateModelValue(newValue) {
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if (newValue > this.max) this.$emit('update:modelValue', this.max);
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else if (newValue < this.min) this.$emit('update:modelValue', this.min);
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else this.$emit('update:modelValue', newValue);
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},
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mapRange(x, inMin, inMax, outMin, outMax) {
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return (x - inMin) * (outMax - outMin) / (inMax - inMin) + outMin;
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},
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onClick(event) {
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if (!this.disabled && !this.readonly) {
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this.updateValue(event.offsetX, event.offsetY);
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}
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},
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onMouseDown(event) {
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if (!this.disabled && !this.readonly) {
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window.addEventListener('mousemove', this.onMouseMove);
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window.addEventListener('mouseup', this.onMouseUp);
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event.preventDefault();
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}
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},
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onMouseUp(event) {
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if (!this.disabled && !this.readonly) {
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window.removeEventListener('mousemove', this.onMouseMove);
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window.removeEventListener('mouseup', this.onMouseUp);
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event.preventDefault();
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}
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},
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onTouchStart(event) {
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if (!this.disabled && !this.readonly) {
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window.addEventListener('touchmove', this.onTouchMove);
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window.addEventListener('touchend', this.onTouchEnd);
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event.preventDefault();
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}
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},
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onTouchEnd(event) {
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if (!this.disabled && !this.readonly) {
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window.removeEventListener('touchmove', this.onTouchMove);
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window.removeEventListener('touchend', this.onTouchEnd);
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event.preventDefault();
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}
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},
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onMouseMove(event) {
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if (!this.disabled && !this.readonly) {
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this.updateValue(event.offsetX, event.offsetY);
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event.preventDefault();
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}
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},
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onTouchMove(event) {
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if (!this.disabled && !this.readonly && event.touches.length == 1) {
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const rect = this.$el.getBoundingClientRect();
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const touch = event.targetTouches.item(0);
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const offsetX = touch.clientX - rect.left;
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const offsetY = touch.clientY - rect.top;
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this.updateValue(offsetX, offsetY);
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}
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},
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onKeyDown(event) {
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if (!this.disabled && !this.readonly) {
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switch (event.code) {
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case 'ArrowRight':
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case 'ArrowUp': {
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event.preventDefault();
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this.updateModelValue(this.modelValue + 1);
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break;
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}
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case 'ArrowLeft':
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case 'ArrowDown': {
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event.preventDefault();
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this.updateModelValue(this.modelValue - 1);
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break;
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}
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case 'Home': {
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event.preventDefault();
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this.$emit('update:modelValue', this.min);
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break;
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}
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case 'End': {
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event.preventDefault();
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this.$emit('update:modelValue', this.max);
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break;
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}
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case 'PageUp': {
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event.preventDefault();
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this.updateModelValue(this.modelValue + 10);
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break;
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}
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case 'PageDown': {
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event.preventDefault();
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this.updateModelValue(this.modelValue - 10);
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break;
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}
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}
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}
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}
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},
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computed: {
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containerClass() {
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return [
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'p-knob p-component', {
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'p-disabled': this.disabled
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}
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];
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},
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rangePath() {
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return `M ${this.minX} ${this.minY} A ${this.radius} ${this.radius} 0 1 1 ${this.maxX} ${this.maxY}`;
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},
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valuePath() {
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return `M ${this.zeroX} ${this.zeroY} A ${this.radius} ${this.radius} 0 ${this.largeArc} ${this.sweep} ${this.valueX} ${this.valueY}`;
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},
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zeroRadians() {
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if (this.min > 0 && this.max > 0)
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return this.mapRange(this.min, this.min, this.max, this.minRadians, this.maxRadians);
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else
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return this.mapRange(0, this.min, this.max, this.minRadians, this.maxRadians);
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},
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valueRadians() {
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return this.mapRange(this.modelValue, this.min, this.max, this.minRadians, this.maxRadians);
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},
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minX() {
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return this.midX + Math.cos(this.minRadians) * this.radius;
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},
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minY() {
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return this.midY - Math.sin(this.minRadians) * this.radius;
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},
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maxX() {
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return this.midX + Math.cos(this.maxRadians) * this.radius;
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},
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maxY() {
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return this.midY - Math.sin(this.maxRadians) * this.radius;
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},
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zeroX() {
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return this.midX + Math.cos(this.zeroRadians) * this.radius;
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},
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zeroY() {
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return this.midY - Math.sin(this.zeroRadians) * this.radius;
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},
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valueX() {
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return this.midX + Math.cos(this.valueRadians) * this.radius;
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},
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valueY() {
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return this.midY - Math.sin(this.valueRadians) * this.radius;
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},
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largeArc() {
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return Math.abs(this.zeroRadians - this.valueRadians) < Math.PI ? 0 : 1;
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},
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sweep() {
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return this.valueRadians > this.zeroRadians ? 0 : 1;
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},
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valueToDisplay() {
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return this.valueTemplate.replace(/{value}/g, this.modelValue);
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}
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}
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}
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//Derived and forked from https://github.com/kramer99/vue-knob-control
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</script>
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<style>
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@keyframes dash-frame {
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100% {
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stroke-dashoffset: 0;
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}
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}
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.p-knob-range {
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fill: none;
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transition: stroke .1s ease-in;
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}
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.p-knob-value {
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animation-name: dash-frame;
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animation-fill-mode: forwards;
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fill: none;
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}
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.p-knob-text {
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font-size: 1.3rem;
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text-align: center;
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}
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</style>
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