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quasar-framework

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Build responsive SPA, SSR, PWA, Hybrid Mobile Apps and Electron apps, all simultaneously using the same codebase

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import QResizeObservable from '../observables/QResizeObservable.js' import CanRenderMixin from '../../mixins/can-render.js' export default { name: 'QLayoutHeader', mixins: [ CanRenderMixin ], inject: { layout: { default () { console.error('QLayoutHeader needs to be child of QLayout') } } }, props: { value: { type: Boolean, default: true }, reveal: Boolean, revealOffset: { type: Number, default: 250 } }, data () { return { size: 0, revealed: true } }, watch: { value (val) { this.__update('space', val) this.__updateLocal('revealed', true) this.layout.__animate() }, offset (val) { this.__update('offset', val) }, reveal (val) { if (!val) { this.__updateLocal('revealed', this.value) } }, revealed (val) { this.layout.__animate() this.$emit('reveal', val) }, 'layout.scroll' (scroll) { if (!this.reveal) { return } this.__updateLocal('revealed', scroll.direction === 'up' || scroll.position <= this.revealOffset || scroll.position - scroll.inflexionPosition < 100 ) } }, computed: { fixed () { return this.reveal || this.layout.view.indexOf('H') > -1 || this.layout.container }, offset () { if (!this.canRender || !this.value) { return 0 } if (this.fixed) { return this.revealed ? this.size : 0 } const offset = this.size - this.layout.scroll.position return offset > 0 ? offset : 0 }, computedClass () { return { 'fixed-top': this.fixed, 'absolute-top': !this.fixed, 'q-layout-header-hidden': !this.canRender || !this.value || (this.fixed && !this.revealed) } }, computedStyle () { const view = this.layout.rows.top, css = {} if (view[0] === 'l' && this.layout.left.space) { css[this.$q.i18n.rtl ? 'right' : 'left'] = `${this.layout.left.size}px` } if (view[2] === 'r' && this.layout.right.space) { css[this.$q.i18n.rtl ? 'left' : 'right'] = `${this.layout.right.size}px` } return css } }, render (h) { return h('header', { staticClass: 'q-layout-header q-layout-marginal q-layout-transition', 'class': this.computedClass, style: this.computedStyle }, [ h(QResizeObservable, { props: { debounce: 0 }, on: { resize: this.__onResize } }), this.$slots.default ]) }, created () { this.layout.instances.header = this this.__update('space', this.value) this.__update('offset', this.offset) }, beforeDestroy () { if (this.layout.instances.header === this) { this.layout.instances.header = null this.__update('size', 0) this.__update('offset', 0) this.__update('space', false) } }, methods: { __onResize ({ height }) { this.__updateLocal('size', height) this.__update('size', height) }, __update (prop, val) { if (this.layout.header[prop] !== val) { this.layout.header[prop] = val } }, __updateLocal (prop, val) { if (this[prop] !== val) { this[prop] = val } } } }