@catull/igniteui-angular
Version:
Ignite UI for Angular is a dependency-free Angular toolkit for building modern web apps
177 lines • 31.8 kB
JavaScript
import { VerticalAlignment, HorizontalAlignment, Util } from '../services/overlay/utilities';
import { fadeOut, fadeIn } from '../animations/main';
import { isIE } from '../core/utils';
import { BaseFitPositionStrategy } from '../services/overlay/position/base-fit-position-strategy';
/** @hidden @internal */
export class SelectPositioningStrategy extends BaseFitPositionStrategy {
constructor(select, settings) {
super();
this.select = select;
this._selectDefaultSettings = {
horizontalDirection: HorizontalAlignment.Right,
verticalDirection: VerticalAlignment.Bottom,
horizontalStartPoint: HorizontalAlignment.Left,
verticalStartPoint: VerticalAlignment.Top,
openAnimation: fadeIn,
closeAnimation: fadeOut
};
// Global variables required for cases of !initialCall (page scroll/overlay repositionAll)
this.global_yOffset = 0;
this.global_xOffset = 0;
this.global_styles = {};
this.settings = Object.assign({}, this._selectDefaultSettings, settings);
}
/** @inheritdoc */
position(contentElement, size, document, initialCall) {
const rects = super.calculateElementRectangles(contentElement);
// selectFit obj, to be used for both cases of initialCall and !initialCall(page scroll/overlay repositionAll)
const selectFit = {
verticalOffset: this.global_yOffset,
horizontalOffset: this.global_xOffset,
targetRect: rects.targetRect,
contentElementRect: rects.elementRect,
styles: this.global_styles,
scrollContainer: this.select.scrollContainer,
scrollContainerRect: this.select.scrollContainer.getBoundingClientRect()
};
if (initialCall) {
// Fill in the required selectFit object properties.
selectFit.viewPortRect = Util.getViewportRect(document);
selectFit.itemElement = this.getInteractionItemElement();
selectFit.itemRect = selectFit.itemElement.getBoundingClientRect();
// Calculate input and selected item elements style related variables
selectFit.styles = this.calculateStyles(selectFit);
selectFit.scrollAmount = this.calculateScrollAmount(selectFit);
// Calculate how much to offset the overlay container.
this.calculateYoffset(selectFit);
this.calculateXoffset(selectFit);
super.updateViewPortFit(selectFit);
// container does not fit in viewPort and is out on Top or Bottom
if (selectFit.fitVertical.back < 0 || selectFit.fitVertical.forward < 0) {
this.fitInViewport(contentElement, selectFit);
}
this.select.scrollContainer.scrollTop = selectFit.scrollAmount;
}
this.setStyles(contentElement, selectFit);
}
/**
* Calculate selected item scroll position.
*/
calculateScrollAmount(selectFit) {
const itemElementRect = selectFit.itemRect;
const scrollContainer = selectFit.scrollContainer;
const scrollContainerRect = selectFit.scrollContainerRect;
const scrollDelta = scrollContainerRect.top - itemElementRect.top;
let scrollPosition = scrollContainer.scrollTop - scrollDelta;
const dropDownHeight = scrollContainer.clientHeight;
scrollPosition -= dropDownHeight / 2;
scrollPosition += itemElementRect.height / 2;
return Math.round(Math.min(Math.max(0, scrollPosition), scrollContainer.scrollHeight - scrollContainerRect.height));
}
/**
* Position the items outer container so selected item text is positioned over input text and if header
* And/OR footer - both header/footer are visible
* @param selectFit selectFit to use for computation.
*/
fitInViewport(contentElement, selectFit) {
const footer = selectFit.scrollContainerRect.bottom - selectFit.contentElementRect.bottom;
const header = selectFit.scrollContainerRect.top - selectFit.contentElementRect.top;
const lastItemFitSize = selectFit.targetRect.bottom + selectFit.styles.itemTextToInputTextDiff - footer;
const firstItemFitSize = selectFit.targetRect.top - selectFit.styles.itemTextToInputTextDiff - header;
// out of viewPort on Top
if (selectFit.fitVertical.back < 0) {
const possibleScrollAmount = selectFit.scrollContainer.scrollHeight -
selectFit.scrollContainerRect.height - selectFit.scrollAmount;
if (possibleScrollAmount + selectFit.fitVertical.back > 0 && firstItemFitSize > selectFit.viewPortRect.top) {
selectFit.scrollAmount -= selectFit.fitVertical.back;
selectFit.verticalOffset -= selectFit.fitVertical.back;
this.global_yOffset = selectFit.verticalOffset;
}
else {
selectFit.verticalOffset = 0;
this.global_yOffset = 0;
}
// out of viewPort on Bottom
}
else if (selectFit.fitVertical.forward < 0) {
if (selectFit.scrollAmount + selectFit.fitVertical.forward > 0 && lastItemFitSize < selectFit.viewPortRect.bottom) {
selectFit.scrollAmount += selectFit.fitVertical.forward;
selectFit.verticalOffset += selectFit.fitVertical.forward;
this.global_yOffset = selectFit.verticalOffset;
}
else {
selectFit.verticalOffset = -selectFit.contentElementRect.height + selectFit.targetRect.height;
this.global_yOffset = selectFit.verticalOffset;
}
}
}
/**
* Sets element's style which effectively positions the provided element
* @param element Element to position
* @param selectFit selectFit to use for computation.
* @param initialCall should be true if this is the initial call to the position method calling setStyles
*/
setStyles(contentElement, selectFit) {
super.setStyle(contentElement, selectFit.targetRect, selectFit.contentElementRect, selectFit);
contentElement.style.width = `${selectFit.styles.contentElementNewWidth}px`; // manage container based on paddings?
this.global_styles.contentElementNewWidth = selectFit.styles.contentElementNewWidth;
}
/**
* Calculate the necessary input and selected item styles to be used for positioning item text over input text.
* Calculate & Set default items container width.
* @param selectFit selectFit to use for computation.
*/
calculateStyles(selectFit) {
const styles = {};
const inputElementStyles = window.getComputedStyle(this.settings.target);
const itemElementStyles = window.getComputedStyle(selectFit.itemElement);
const numericInputFontSize = parseFloat(inputElementStyles.fontSize);
const numericItemFontSize = parseFloat(itemElementStyles.fontSize);
const inputTextToInputTop = (selectFit.targetRect.bottom - selectFit.targetRect.top - numericInputFontSize) / 2;
const itemTextToItemTop = (selectFit.itemRect.height - numericItemFontSize) / 2;
// Adjust for input top padding
const negateInputPaddings = (parseFloat(inputElementStyles.paddingTop) -
parseFloat(inputElementStyles.paddingBottom)) / 2;
styles.itemTextToInputTextDiff = Math.round(itemTextToItemTop - inputTextToInputTop + negateInputPaddings);
const numericLeftPadding = parseFloat(itemElementStyles.paddingLeft);
const numericTextIndent = parseFloat(itemElementStyles.textIndent);
styles.itemTextPadding = numericLeftPadding;
styles.itemTextIndent = numericTextIndent;
// 24 is the input's toggle ddl icon width
styles.contentElementNewWidth = selectFit.targetRect.width + 24 + numericLeftPadding * 2;
return styles;
}
/**
* Obtain the selected item if there is such one or otherwise use the first one
*/
getInteractionItemElement() {
let itemElement;
if (this.select.selectedItem) {
itemElement = this.select.selectedItem.element.nativeElement;
// D.P. Feb 22 2019, #3921 Force item scroll before measuring in IE11, due to base scrollToItem delay
if (isIE()) {
this.select.scrollContainer.scrollTop = this.select.calculateScrollPosition(this.select.selectedItem);
}
}
else {
itemElement = this.select.getFirstItemElement();
}
return itemElement;
}
/**
* Calculate how much to offset the overlay container for Y-axis.
*/
calculateYoffset(selectFit) {
selectFit.verticalOffset = -(selectFit.itemRect.top - selectFit.contentElementRect.top +
selectFit.styles.itemTextToInputTextDiff - selectFit.scrollAmount);
this.global_yOffset = selectFit.verticalOffset;
}
/**
* Calculate how much to offset the overlay container for X-axis.
*/
calculateXoffset(selectFit) {
selectFit.horizontalOffset = selectFit.styles.itemTextIndent - selectFit.styles.itemTextPadding;
this.global_xOffset = selectFit.horizontalOffset;
}
}
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{ VerticalAlignment, HorizontalAlignment, PositionSettings, Size, Util, ConnectedFit  } from '../services/overlay/utilities';\nimport { IPositionStrategy } from '../services/overlay/position';\nimport { fadeOut, fadeIn } from '../animations/main';\nimport { IgxSelectBase } from './select.common';\nimport { isIE } from '../core/utils';\nimport { BaseFitPositionStrategy } from '../services/overlay/position/base-fit-position-strategy';\n\n/** @hidden @internal */\nexport class SelectPositioningStrategy extends BaseFitPositionStrategy implements IPositionStrategy {\n\n    private _selectDefaultSettings = {\n        horizontalDirection: HorizontalAlignment.Right,\n        verticalDirection: VerticalAlignment.Bottom,\n        horizontalStartPoint: HorizontalAlignment.Left,\n        verticalStartPoint: VerticalAlignment.Top,\n        openAnimation: fadeIn,\n        closeAnimation: fadeOut\n    };\n\n    /** @inheritdoc */\n    public settings: PositionSettings;\n\n    constructor(public select: IgxSelectBase, settings?: PositionSettings) {\n        super();\n        this.settings = Object.assign({}, this._selectDefaultSettings, settings);\n    }\n\n    // Global variables required for cases of !initialCall (page scroll/overlay repositionAll)\n    private global_yOffset = 0;\n    private global_xOffset = 0;\n    private global_styles: SelectStyles = {};\n\n    /** @inheritdoc */\n    position(contentElement: HTMLElement, size: Size, document?: Document, initialCall?: boolean): void {\n        const rects = super.calculateElementRectangles(contentElement);\n        // selectFit obj, to be used for both cases of initialCall and !initialCall(page scroll/overlay repositionAll)\n        const selectFit: SelectFit = {\n            verticalOffset: this.global_yOffset,\n            horizontalOffset: this.global_xOffset,\n            targetRect: rects.targetRect,\n            contentElementRect: rects.elementRect,\n            styles: this.global_styles,\n            scrollContainer: this.select.scrollContainer,\n            scrollContainerRect: this.select.scrollContainer.getBoundingClientRect()\n        };\n\n        if (initialCall) {\n            // Fill in the required selectFit object properties.\n            selectFit.viewPortRect = Util.getViewportRect(document);\n            selectFit.itemElement = this.getInteractionItemElement();\n            selectFit.itemRect = selectFit.itemElement.getBoundingClientRect();\n\n            // Calculate input and selected item elements style related variables\n            selectFit.styles = this.calculateStyles(selectFit);\n\n            selectFit.scrollAmount = this.calculateScrollAmount(selectFit);\n            // Calculate how much to offset the overlay container.\n            this.calculateYoffset(selectFit);\n            this.calculateXoffset(selectFit);\n\n            super.updateViewPortFit(selectFit);\n            // container does not fit in viewPort and is out on Top or Bottom\n            if (selectFit.fitVertical.back < 0 || selectFit.fitVertical.forward < 0 ) {\n                this.fitInViewport(contentElement, selectFit);\n            }\n            this.select.scrollContainer.scrollTop = selectFit.scrollAmount;\n        }\n        this.setStyles(contentElement, selectFit);\n    }\n\n    /**\n     * Calculate selected item scroll position.\n     */\n    private calculateScrollAmount(selectFit: SelectFit): number {\n        const itemElementRect = selectFit.itemRect;\n        const scrollContainer = selectFit.scrollContainer;\n        const scrollContainerRect = selectFit.scrollContainerRect;\n        const scrollDelta = scrollContainerRect.top - itemElementRect.top;\n        let scrollPosition = scrollContainer.scrollTop - scrollDelta;\n\n        const dropDownHeight = scrollContainer.clientHeight;\n        scrollPosition -= dropDownHeight / 2;\n        scrollPosition += itemElementRect.height / 2;\n\n        return Math.round(Math.min(Math.max(0, scrollPosition), scrollContainer.scrollHeight - scrollContainerRect.height));\n    }\n\n    /**\n     * Position the items outer container so selected item text is positioned over input text and if header\n     * And/OR footer - both header/footer are visible\n     * @param selectFit selectFit to use for computation.\n     */\n    protected fitInViewport(contentElement: HTMLElement, selectFit: SelectFit) {\n        const footer = selectFit.scrollContainerRect.bottom - selectFit.contentElementRect.bottom;\n        const header = selectFit.scrollContainerRect.top - selectFit.contentElementRect.top;\n        const lastItemFitSize = selectFit.targetRect.bottom + selectFit.styles.itemTextToInputTextDiff - footer;\n        const firstItemFitSize = selectFit.targetRect.top - selectFit.styles.itemTextToInputTextDiff - header;\n        // out of viewPort on Top\n        if (selectFit.fitVertical.back < 0) {\n            const possibleScrollAmount = selectFit.scrollContainer.scrollHeight -\n                selectFit.scrollContainerRect.height - selectFit.scrollAmount;\n            if (possibleScrollAmount + selectFit.fitVertical.back > 0 && firstItemFitSize > selectFit.viewPortRect.top) {\n                selectFit.scrollAmount -= selectFit.fitVertical.back;\n                selectFit.verticalOffset -= selectFit.fitVertical.back;\n                this.global_yOffset = selectFit.verticalOffset;\n            } else {\n                selectFit.verticalOffset = 0 ;\n                this.global_yOffset = 0;\n            }\n        // out of viewPort on Bottom\n        } else if (selectFit.fitVertical.forward < 0) {\n            if (selectFit.scrollAmount + selectFit.fitVertical.forward > 0 && lastItemFitSize < selectFit.viewPortRect.bottom) {\n                selectFit.scrollAmount += selectFit.fitVertical.forward;\n                selectFit.verticalOffset += selectFit.fitVertical.forward;\n                this.global_yOffset = selectFit.verticalOffset;\n            } else {\n                selectFit.verticalOffset = -selectFit.contentElementRect.height + selectFit.targetRect.height;\n                this.global_yOffset = selectFit.verticalOffset;\n            }\n        }\n    }\n\n    /**\n     * Sets element's style which effectively positions the provided element\n     * @param element Element to position\n     * @param selectFit selectFit to use for computation.\n     * @param initialCall should be true if this is the initial call to the position method calling setStyles\n     */\n    protected setStyles(contentElement: HTMLElement, selectFit: SelectFit) {\n        super.setStyle(contentElement, selectFit.targetRect, selectFit.contentElementRect, selectFit);\n        contentElement.style.width = `${selectFit.styles.contentElementNewWidth}px`; // manage container based on paddings?\n        this.global_styles.contentElementNewWidth = selectFit.styles.contentElementNewWidth;\n    }\n\n    /**\n     * Calculate the necessary input and selected item styles to be used for positioning item text over input text.\n     * Calculate & Set default items container width.\n     * @param selectFit selectFit to use for computation.\n     */\n    private calculateStyles(selectFit: SelectFit): SelectStyles  {\n        const styles: SelectStyles = {};\n        const inputElementStyles = window.getComputedStyle(this.settings.target as Element);\n        const itemElementStyles = window.getComputedStyle(selectFit.itemElement);\n        const numericInputFontSize = parseFloat(inputElementStyles.fontSize);\n        const numericItemFontSize = parseFloat(itemElementStyles.fontSize);\n        const inputTextToInputTop = (selectFit.targetRect.bottom - selectFit.targetRect.top - numericInputFontSize) / 2;\n        const itemTextToItemTop = (selectFit.itemRect.height - numericItemFontSize) / 2;\n         // Adjust for input top padding\n        const negateInputPaddings = (\n                parseFloat(inputElementStyles.paddingTop) -\n                parseFloat(inputElementStyles.paddingBottom)\n            ) / 2;\n        styles.itemTextToInputTextDiff = Math.round(itemTextToItemTop - inputTextToInputTop + negateInputPaddings);\n\n        const numericLeftPadding = parseFloat(itemElementStyles.paddingLeft);\n        const numericTextIndent = parseFloat(itemElementStyles.textIndent);\n\n        styles.itemTextPadding = numericLeftPadding;\n        styles.itemTextIndent = numericTextIndent;\n        // 24 is the input's toggle ddl icon width\n        styles.contentElementNewWidth = selectFit.targetRect.width + 24 + numericLeftPadding * 2;\n\n        return styles;\n    }\n\n    /**\n     * Obtain the selected item if there is such one or otherwise use the first one\n     */\n    public getInteractionItemElement(): HTMLElement {\n        let itemElement;\n        if (this.select.selectedItem) {\n            itemElement = this.select.selectedItem.element.nativeElement;\n            // D.P. Feb 22 2019, #3921 Force item scroll before measuring in IE11, due to base scrollToItem delay\n            if (isIE()) {\n                this.select.scrollContainer.scrollTop = this.select.calculateScrollPosition(this.select.selectedItem);\n            }\n        } else {\n            itemElement = this.select.getFirstItemElement();\n        }\n        return itemElement;\n    }\n\n    /**\n     * Calculate how much to offset the overlay container for Y-axis.\n     */\n    private calculateYoffset(selectFit: SelectFit) {\n        selectFit.verticalOffset = -(selectFit.itemRect.top - selectFit.contentElementRect.top +\n            selectFit.styles.itemTextToInputTextDiff - selectFit.scrollAmount);\n        this.global_yOffset = selectFit.verticalOffset;\n    }\n\n    /**\n     * Calculate how much to offset the overlay container for X-axis.\n     */\n    private calculateXoffset(selectFit: SelectFit) {\n        selectFit.horizontalOffset = selectFit.styles.itemTextIndent - selectFit.styles.itemTextPadding;\n        this.global_xOffset = selectFit.horizontalOffset;\n    }\n}\n\n/** @hidden */\nexport interface SelectFit extends ConnectedFit {\n    itemElement?: HTMLElement;\n    scrollContainer: HTMLElement;\n    scrollContainerRect: ClientRect;\n    itemRect?: ClientRect;\n    styles?: SelectStyles;\n    scrollAmount?: number;\n}\n\n/** @hidden */\nexport interface SelectStyles {\n    itemTextPadding?: number;\n    itemTextIndent?: number;\n    itemTextToInputTextDiff?: number;\n    contentElementNewWidth?: number;\n    numericLeftPadding?: number;\n}\n"]}