ng2-split-pane-patch/lib/position.service.js

A simple resizable split pane Angular 2 library

export class PositionService {
    static position(element) {
        let nativeEl = element.nativeElement;
        let elBCR = this.offset(nativeEl);
        let offsetParentBCR = { top: 0, left: 0 };
        let offsetParentEl = this.parentOffsetEl(nativeEl);
        if (offsetParentEl !== this.document) {
            offsetParentBCR = this.offset(offsetParentEl);
            offsetParentBCR.top += offsetParentEl.clientTop - offsetParentEl.scrollTop;
            offsetParentBCR.left += offsetParentEl.clientLeft - offsetParentEl.scrollLeft;
        }
        let boundingClientRect = nativeEl.getBoundingClientRect();
        return {
            width: boundingClientRect.width || nativeEl.offsetWidth,
            height: boundingClientRect.height || nativeEl.offsetHeight,
            top: elBCR.top - offsetParentBCR.top,
            left: elBCR.left - offsetParentBCR.left
        };
    }
    static offset(element) {
        let nativeEl = element.nativeElement;
        let boundingClientRect = nativeEl.getBoundingClientRect();
        return {
            width: boundingClientRect.width || nativeEl.offsetWidth,
            height: boundingClientRect.height || nativeEl.offsetHeight,
            top: boundingClientRect.top + (this.window.pageYOffset || this.document.documentElement.scrollTop),
            left: boundingClientRect.left + (this.window.pageXOffset || this.document.documentElement.scrollLeft)
        };
    }
    static positionElements(host, target, positionStr, appendToBody) {
        let hostEl = host.nativeElement;
        let targetEl = target.nativeElement;
        let positionStrParts = positionStr.split('-');
        let pos0 = positionStrParts[0];
        let pos1 = positionStrParts[1] || 'center';
        let hostElPos = appendToBody ?
            this.offset(hostEl) :
            this.position(hostEl);
        let targetElWidth = targetEl.offsetWidth;
        let targetElHeight = targetEl.offsetHeight;
        let shiftWidth = {
            center: function () {
                return hostElPos.left + hostElPos.width / 2 - targetElWidth / 2;
            },
            left: function () {
                return hostElPos.left;
            },
            right: function () {
                return hostElPos.left + hostElPos.width;
            }
        };
        let shiftHeight = {
            center: function () {
                return hostElPos.top + hostElPos.height / 2 - targetElHeight / 2;
            },
            top: function () {
                return hostElPos.top;
            },
            bottom: function () {
                return hostElPos.top + hostElPos.height;
            }
        };
        let targetElPos;
        switch (pos0) {
            case 'right':
                targetElPos = {
                    top: shiftHeight[pos1](),
                    left: shiftWidth[pos0]()
                };
                break;
            case 'left':
                targetElPos = {
                    top: shiftHeight[pos1](),
                    left: hostElPos.left - targetElWidth
                };
                break;
            case 'bottom':
                targetElPos = {
                    top: shiftHeight[pos0](),
                    left: shiftWidth[pos1]()
                };
                break;
            default:
                targetElPos = {
                    top: hostElPos.top - targetElHeight,
                    left: shiftWidth[pos1]()
                };
                break;
        }
        return targetElPos;
    }
    static get window() {
        return window;
    }
    static get document() {
        return window.document;
    }
    static getStyle(nativeEl, cssProp) {
        if (nativeEl.currentStyle) {
            return nativeEl.currentStyle[cssProp];
        }
        if (this.window.getComputedStyle) {
            return this.window.getComputedStyle(nativeEl)[cssProp];
        }
        return nativeEl.style[cssProp];
    }
    static isStaticPositioned(nativeEl) {
        return (this.getStyle(nativeEl, 'position') || 'static') === 'static';
    }
    static parentOffsetEl(nativeEl) {
        let offsetParent = nativeEl.offsetParent || this.document;
        while (offsetParent && offsetParent !== this.document &&
            this.isStaticPositioned(offsetParent)) {
            offsetParent = offsetParent.offsetParent;
        }
        return offsetParent || this.document;
    }
    ;
}
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