@hugogo/angular-grid-layout-hugo
Version:
Grid Layout with draggable and resizable items for Angular
163 lines • 30.2 kB
JavaScript
import { compact, getFirstCollision, moveElement } from './react-grid-layout.utils';
import { ktdPointerClientX, ktdPointerClientY } from './pointer.utils';
/** Tracks items by id. This function is mean to be used in conjunction with the ngFor that renders the 'ktd-grid-items' */
export function ktdTrackById(index, item) {
return item.id;
}
/**
* Call react-grid-layout utils 'compact()' function and return the compacted layout.
* @param layout to be compacted.
* @param compactType, type of compaction.
* @param cols, number of columns of the grid.
*/
export function ktdGridCompact(layout, compactType, cols) {
return compact(layout, compactType, cols)
// Prune react-grid-layout compact extra properties.
.map(item => ({ id: item.id, x: item.x, y: item.y, w: item.w, h: item.h }));
}
function screenXPosToGridValue(screenXPos, cols, width) {
return Math.round((screenXPos * cols) / width);
}
function screenYPosToGridValue(screenYPos, rowHeight, height) {
return Math.round(screenYPos / rowHeight);
}
/** Returns a Dictionary where the key is the id and the value is the change applied to that item. If no changes Dictionary is empty. */
export function ktdGetGridLayoutDiff(gridLayoutA, gridLayoutB) {
const diff = {};
gridLayoutA.forEach(itemA => {
const itemB = gridLayoutB.find(_itemB => _itemB.id === itemA.id);
if (itemB != null) {
const posChanged = itemA.x !== itemB.x || itemA.y !== itemB.y;
const sizeChanged = itemA.w !== itemB.w || itemA.h !== itemB.h;
const change = posChanged && sizeChanged ? 'moveresize' : posChanged ? 'move' : sizeChanged ? 'resize' : null;
if (change) {
diff[itemB.id] = { change };
}
}
});
return diff;
}
/**
* Given the grid config & layout data and the current drag position & information, returns the corresponding layout and drag item position
* @param gridItemId id of the grid item that is been dragged
* @param config current grid configuration
* @param compactionType type of compaction that will be performed
* @param draggingData contains all the information about the drag
*/
export function ktdGridItemDragging(gridItemId, config, compactionType, draggingData) {
const { pointerDownEvent, pointerDragEvent, gridElemClientRect, dragElemClientRect, scrollDifference } = draggingData;
const draggingElemPrevItem = config.layout.find(item => item.id === gridItemId);
const clientStartX = ktdPointerClientX(pointerDownEvent);
const clientStartY = ktdPointerClientY(pointerDownEvent);
const clientX = ktdPointerClientX(pointerDragEvent);
const clientY = ktdPointerClientY(pointerDragEvent);
const offsetX = clientStartX - dragElemClientRect.left;
const offsetY = clientStartY - dragElemClientRect.top;
// Grid element positions taking into account the possible scroll total difference from the beginning.
const gridElementLeftPosition = gridElemClientRect.left + scrollDifference.left;
const gridElementTopPosition = gridElemClientRect.top + scrollDifference.top;
// Calculate position relative to the grid element.
const gridRelXPos = clientX - gridElementLeftPosition - offsetX;
const gridRelYPos = clientY - gridElementTopPosition - offsetY;
// Get layout item position
const layoutItem = Object.assign(Object.assign({}, draggingElemPrevItem), { x: screenXPosToGridValue(gridRelXPos, config.cols, gridElemClientRect.width), y: screenYPosToGridValue(gridRelYPos, config.rowHeight, gridElemClientRect.height) });
// Correct the values if they overflow, since 'moveElement' function doesn't do it
layoutItem.x = Math.max(0, layoutItem.x);
layoutItem.y = Math.max(0, layoutItem.y);
if (layoutItem.x + layoutItem.w > config.cols) {
layoutItem.x = Math.max(0, config.cols - layoutItem.w);
}
// Parse to LayoutItem array data in order to use 'react.grid-layout' utils
const layoutItems = config.layout;
const draggedLayoutItem = layoutItems.find(item => item.id === gridItemId);
let newLayoutItems = moveElement(layoutItems, draggedLayoutItem, layoutItem.x, layoutItem.y, true, config.preventCollision, compactionType, config.cols);
newLayoutItems = compact(newLayoutItems, compactionType, config.cols);
return {
layout: newLayoutItems,
draggedItemPos: {
top: gridRelYPos,
left: gridRelXPos,
width: dragElemClientRect.width,
height: dragElemClientRect.height,
}
};
}
/**
* Given the grid config & layout data and the current drag position & information, returns the corresponding layout and drag item position
* @param gridItemId id of the grid item that is been dragged
* @param config current grid configuration
* @param compactionType type of compaction that will be performed
* @param draggingData contains all the information about the drag
*/
export function ktdGridItemResizing(gridItemId, config, compactionType, draggingData) {
const { pointerDownEvent, pointerDragEvent, gridElemClientRect, dragElemClientRect, scrollDifference } = draggingData;
const clientStartX = ktdPointerClientX(pointerDownEvent);
const clientStartY = ktdPointerClientY(pointerDownEvent);
const clientX = ktdPointerClientX(pointerDragEvent);
const clientY = ktdPointerClientY(pointerDragEvent);
// Get the difference between the mouseDown and the position 'right' of the resize element.
const resizeElemOffsetX = dragElemClientRect.width - (clientStartX - dragElemClientRect.left);
const resizeElemOffsetY = dragElemClientRect.height - (clientStartY - dragElemClientRect.top);
const draggingElemPrevItem = config.layout.find(item => item.id === gridItemId);
const width = clientX + resizeElemOffsetX - (dragElemClientRect.left + scrollDifference.left);
const height = clientY + resizeElemOffsetY - (dragElemClientRect.top + scrollDifference.top);
// Get layout item grid position
const layoutItem = Object.assign(Object.assign({}, draggingElemPrevItem), { w: screenXPosToGridValue(width, config.cols, gridElemClientRect.width), h: screenYPosToGridValue(height, config.rowHeight, gridElemClientRect.height) });
layoutItem.w = Math.max(1, layoutItem.w);
layoutItem.h = Math.max(1, layoutItem.h);
if (layoutItem.x + layoutItem.w > config.cols) {
layoutItem.w = Math.max(1, config.cols - layoutItem.x);
}
if (config.preventCollision) {
const maxW = layoutItem.w;
const maxH = layoutItem.h;
let colliding = hasCollision(config.layout, layoutItem);
let shrunkDimension;
while (colliding) {
shrunkDimension = getDimensionToShrink(layoutItem, shrunkDimension);
layoutItem[shrunkDimension]--;
colliding = hasCollision(config.layout, layoutItem);
}
if (shrunkDimension === 'w') {
layoutItem.h = maxH;
colliding = hasCollision(config.layout, layoutItem);
while (colliding) {
layoutItem.h--;
colliding = hasCollision(config.layout, layoutItem);
}
}
if (shrunkDimension === 'h') {
layoutItem.w = maxW;
colliding = hasCollision(config.layout, layoutItem);
while (colliding) {
layoutItem.w--;
colliding = hasCollision(config.layout, layoutItem);
}
}
}
const newLayoutItems = config.layout.map((item) => {
return item.id === gridItemId ? layoutItem : item;
});
return {
layout: compact(newLayoutItems, compactionType, config.cols),
draggedItemPos: {
top: dragElemClientRect.top - gridElemClientRect.top,
left: dragElemClientRect.left - gridElemClientRect.left,
width,
height,
}
};
}
function hasCollision(layout, layoutItem) {
return !!getFirstCollision(layout, layoutItem);
}
function getDimensionToShrink(layoutItem, lastShrunk) {
if (layoutItem.h <= 1) {
return 'w';
}
if (layoutItem.w <= 1) {
return 'h';
}
return lastShrunk === 'w' ? 'h' : 'w';
}
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{ compact, CompactType, getFirstCollision, Layout, LayoutItem, moveElement } from './react-grid-layout.utils';\nimport { KtdDraggingData, KtdGridCfg, KtdGridCompactType, KtdGridItemRect, KtdGridLayout, KtdGridLayoutItem } from '../grid.definitions';\nimport { ktdPointerClientX, ktdPointerClientY } from './pointer.utils';\nimport { KtdDictionary } from '../../types';\n\n/** Tracks items by id. This function is mean to be used in conjunction with the ngFor that renders the 'ktd-grid-items' */\nexport function ktdTrackById(index: number, item: {id: string}) {\n    return item.id;\n}\n\n/**\n * Call react-grid-layout utils 'compact()' function and return the compacted layout.\n * @param layout to be compacted.\n * @param compactType, type of compaction.\n * @param cols, number of columns of the grid.\n */\nexport function ktdGridCompact(layout: KtdGridLayout, compactType: KtdGridCompactType, cols: number): KtdGridLayout {\n    return compact(layout, compactType, cols)\n        // Prune react-grid-layout compact extra properties.\n        .map(item => ({id: item.id, x: item.x, y: item.y, w: item.w, h: item.h}));\n}\n\nfunction screenXPosToGridValue(screenXPos: number, cols: number, width: number): number {\n    return Math.round((screenXPos * cols) / width);\n}\n\nfunction screenYPosToGridValue(screenYPos: number, rowHeight: number, height: number): number {\n    return Math.round(screenYPos / rowHeight);\n}\n\n/** Returns a Dictionary where the key is the id and the value is the change applied to that item. If no changes Dictionary is empty. */\nexport function ktdGetGridLayoutDiff(gridLayoutA: KtdGridLayoutItem[], gridLayoutB: KtdGridLayoutItem[]): KtdDictionary<{ change: 'move' | 'resize' | 'moveresize' }> {\n    const diff: KtdDictionary<{ change: 'move' | 'resize' | 'moveresize' }> = {};\n\n    gridLayoutA.forEach(itemA => {\n        const itemB = gridLayoutB.find(_itemB => _itemB.id === itemA.id);\n        if (itemB != null) {\n            const posChanged = itemA.x !== itemB.x || itemA.y !== itemB.y;\n            const sizeChanged = itemA.w !== itemB.w || itemA.h !== itemB.h;\n            const change: 'move' | 'resize' | 'moveresize' | null = posChanged && sizeChanged ? 'moveresize' : posChanged ? 'move' : sizeChanged ? 'resize' : null;\n            if (change) {\n                diff[itemB.id] = {change};\n            }\n        }\n    });\n    return diff;\n}\n\n/**\n * Given the grid config & layout data and the current drag position & information, returns the corresponding layout and drag item position\n * @param gridItemId id of the grid item that is been dragged\n * @param config current grid configuration\n * @param compactionType type of compaction that will be performed\n * @param draggingData contains all the information about the drag\n */\nexport function ktdGridItemDragging(gridItemId: string, config: KtdGridCfg, compactionType: CompactType, draggingData: KtdDraggingData): { layout: KtdGridLayoutItem[]; draggedItemPos: KtdGridItemRect } {\n    const {pointerDownEvent, pointerDragEvent, gridElemClientRect, dragElemClientRect, scrollDifference} = draggingData;\n\n    const draggingElemPrevItem = config.layout.find(item => item.id === gridItemId)!;\n\n    const clientStartX = ktdPointerClientX(pointerDownEvent);\n    const clientStartY = ktdPointerClientY(pointerDownEvent);\n    const clientX = ktdPointerClientX(pointerDragEvent);\n    const clientY = ktdPointerClientY(pointerDragEvent);\n\n    const offsetX = clientStartX - dragElemClientRect.left;\n    const offsetY = clientStartY - dragElemClientRect.top;\n\n    // Grid element positions taking into account the possible scroll total difference from the beginning.\n    const gridElementLeftPosition = gridElemClientRect.left + scrollDifference.left;\n    const gridElementTopPosition = gridElemClientRect.top + scrollDifference.top;\n\n    // Calculate position relative to the grid element.\n    const gridRelXPos = clientX - gridElementLeftPosition - offsetX;\n    const gridRelYPos = clientY - gridElementTopPosition - offsetY;\n\n    // Get layout item position\n    const layoutItem: KtdGridLayoutItem = {\n        ...draggingElemPrevItem,\n        x: screenXPosToGridValue(gridRelXPos, config.cols, gridElemClientRect.width),\n        y: screenYPosToGridValue(gridRelYPos, config.rowHeight, gridElemClientRect.height)\n    };\n\n    // Correct the values if they overflow, since 'moveElement' function doesn't do it\n    layoutItem.x = Math.max(0, layoutItem.x);\n    layoutItem.y = Math.max(0, layoutItem.y);\n    if (layoutItem.x + layoutItem.w > config.cols) {\n        layoutItem.x = Math.max(0, config.cols - layoutItem.w);\n    }\n\n    // Parse to LayoutItem array data in order to use 'react.grid-layout' utils\n    const layoutItems: LayoutItem[] = config.layout;\n    const draggedLayoutItem: LayoutItem = layoutItems.find(item => item.id === gridItemId)!;\n\n    let newLayoutItems: LayoutItem[] = moveElement(\n        layoutItems,\n        draggedLayoutItem,\n        layoutItem.x,\n        layoutItem.y,\n        true,\n        config.preventCollision,\n        compactionType,\n        config.cols\n    );\n\n    newLayoutItems = compact(newLayoutItems, compactionType, config.cols);\n\n    return {\n        layout: newLayoutItems,\n        draggedItemPos: {\n            top: gridRelYPos,\n            left: gridRelXPos,\n            width: dragElemClientRect.width,\n            height: dragElemClientRect.height,\n        }\n    };\n}\n\n/**\n * Given the grid config & layout data and the current drag position & information, returns the corresponding layout and drag item position\n * @param gridItemId id of the grid item that is been dragged\n * @param config current grid configuration\n * @param compactionType type of compaction that will be performed\n * @param draggingData contains all the information about the drag\n */\nexport function ktdGridItemResizing(gridItemId: string, config: KtdGridCfg, compactionType: CompactType, draggingData: KtdDraggingData): { layout: KtdGridLayoutItem[]; draggedItemPos: KtdGridItemRect } {\n    const {pointerDownEvent, pointerDragEvent, gridElemClientRect, dragElemClientRect, scrollDifference} = draggingData;\n\n    const clientStartX = ktdPointerClientX(pointerDownEvent);\n    const clientStartY = ktdPointerClientY(pointerDownEvent);\n    const clientX = ktdPointerClientX(pointerDragEvent);\n    const clientY = ktdPointerClientY(pointerDragEvent);\n\n    // Get the difference between the mouseDown and the position 'right' of the resize element.\n    const resizeElemOffsetX = dragElemClientRect.width - (clientStartX - dragElemClientRect.left);\n    const resizeElemOffsetY = dragElemClientRect.height - (clientStartY - dragElemClientRect.top);\n\n    const draggingElemPrevItem = config.layout.find(item => item.id === gridItemId)!;\n    const width = clientX + resizeElemOffsetX - (dragElemClientRect.left + scrollDifference.left);\n    const height = clientY + resizeElemOffsetY - (dragElemClientRect.top + scrollDifference.top);\n\n\n    // Get layout item grid position\n    const layoutItem: KtdGridLayoutItem = {\n        ...draggingElemPrevItem,\n        w: screenXPosToGridValue(width, config.cols, gridElemClientRect.width),\n        h: screenYPosToGridValue(height, config.rowHeight, gridElemClientRect.height)\n    };\n\n    layoutItem.w = Math.max(1, layoutItem.w);\n    layoutItem.h = Math.max(1, layoutItem.h);\n    if (layoutItem.x + layoutItem.w > config.cols) {\n        layoutItem.w = Math.max(1, config.cols - layoutItem.x);\n    }\n\n    if (config.preventCollision) {\n        const maxW = layoutItem.w;\n        const maxH = layoutItem.h;\n\n        let colliding = hasCollision(config.layout, layoutItem);\n        let shrunkDimension: 'w' | 'h' | undefined;\n\n        while (colliding) {\n            shrunkDimension = getDimensionToShrink(layoutItem, shrunkDimension);\n            layoutItem[shrunkDimension]--;\n            colliding = hasCollision(config.layout, layoutItem);\n        }\n\n        if (shrunkDimension === 'w') {\n            layoutItem.h = maxH;\n\n            colliding = hasCollision(config.layout, layoutItem);\n            while (colliding) {\n                layoutItem.h--;\n                colliding = hasCollision(config.layout, layoutItem);\n            }\n        }\n        if (shrunkDimension === 'h') {\n            layoutItem.w = maxW;\n\n            colliding = hasCollision(config.layout, layoutItem);\n            while (colliding) {\n                layoutItem.w--;\n                colliding = hasCollision(config.layout, layoutItem);\n            }\n        }\n\n    }\n\n    const newLayoutItems: LayoutItem[] = config.layout.map((item) => {\n        return item.id === gridItemId ? layoutItem : item;\n    });\n\n    return {\n        layout: compact(newLayoutItems, compactionType, config.cols),\n        draggedItemPos: {\n            top: dragElemClientRect.top - gridElemClientRect.top,\n            left: dragElemClientRect.left - gridElemClientRect.left,\n            width,\n            height,\n        }\n    };\n}\n\nfunction hasCollision(layout: Layout, layoutItem: LayoutItem): boolean {\n    return !!getFirstCollision(layout, layoutItem);\n}\n\nfunction getDimensionToShrink(layoutItem, lastShrunk): 'w' | 'h' {\n    if (layoutItem.h <= 1) {\n        return 'w';\n    }\n    if (layoutItem.w <= 1) {\n        return 'h';\n    }\n\n    return lastShrunk === 'w' ? 'h' : 'w';\n}\n"]}