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<template>
<div class="flex relative" :class="{'flex-col': vert}"
:style="{color: store.color.text, backgroundColor: store.color.bgDark}" ref="rootRef">
<div v-for="p in periods" :key="p.label" :style="periodStyles(p)">
<div :style="labelStyles">{{p.label}}</div>
</div>
<TransitionGroup name="fade">
<div v-for="range in timelineRanges" :key="range.id" class="absolute" :style="spanStyles(range)">
{{range.id}}
</div>
</TransitionGroup>
</div>
</template>
<script setup lang="ts">
import {ref, computed, onMounted, PropType, Ref} from 'vue';
import {MIN_DATE, MAX_DATE, WRITING_MODE_HORZ, TimelineRange} from '../lib';
import {useStore} from '../store';
// Refs
const rootRef = ref(null as HTMLElement | null);
// Global store
const store = useStore();
// Props
const props = defineProps({
vert: {type: Boolean, required: true},
timelineRanges: {type: Object as PropType<TimelineRange[]>, required: true},
});
// Static time periods
type Period = {label: string, len: number};
const periods: Ref<Period[]> = ref([
{label: 'One', len: 1},
{label: 'Two', len: 2},
{label: 'Three', len: 1},
]);
// For size tracking (used to prevent time spans shrinking below 1 pixel)
const width = ref(0);
const height = ref(0);
const resizeObserver = new ResizeObserver((entries) => {
for (const entry of entries){
if (entry.contentBoxSize){
const boxSize = Array.isArray(entry.contentBoxSize) ? entry.contentBoxSize[0] : entry.contentBoxSize;
width.value = WRITING_MODE_HORZ ? boxSize.inlineSize : boxSize.blockSize;
height.value = WRITING_MODE_HORZ ? boxSize.blockSize : boxSize.inlineSize;
}
}
});
onMounted(() => resizeObserver.observe(rootRef.value as HTMLElement));
// Styles
function periodStyles(period: Period){
return {
outline: '1px solid gray',
flexGrow: period.len,
};
}
const labelStyles = computed((): Record<string, string> => ({
transform: props.vert ? 'rotate(90deg) translate(50%, 0)' : 'none',
whiteSpace: 'nowrap',
width: props.vert ? '40px' : 'auto',
padding: props.vert ? '0' : '4px',
}));
function spanStyles(range: TimelineRange){
let styles: Record<string,string>;
let availLen = props.vert ? height.value : width.value;
let startFrac = (range.start - MIN_DATE) / (MAX_DATE - MIN_DATE);
let lenFrac = (range.end - range.start) / (MAX_DATE - MIN_DATE);
let startPx = Math.max(0, availLen * startFrac); // Prevent negatives due to end-padding
let lenPx = Math.min(availLen - startPx, availLen * lenFrac);
lenPx = Math.max(1, lenPx);
if (props.vert){
styles = {
top: startPx + 'px',
left: '0',
height: lenPx + 'px',
width: '100%',
}
} else {
styles = {
top: '0',
left: startPx + 'px',
height: '100%',
width: lenPx + 'px',
}
}
return {
...styles,
transition: 'all 300ms ease-out',
color: 'black',
backgroundColor: store.color.alt,
opacity: 0.3,
};
}
</script>
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