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import type { Position } from "./utils";
export type PositionParams = {
margin: [number, number],
containerPadding: [number, number],
containerWidth: number,
cols: number,
rowHeight: number,
maxRows: number
};
// Helper for generating column width
export function calcGridColWidth(positionParams: PositionParams): number {
const { margin, containerPadding, containerWidth, cols } = positionParams;
return (
(containerWidth - margin[0] * (cols - 1) - containerPadding[0] * 2) / cols
);
}
// This can either be called:
// calcGridItemWHPx(w, colWidth, margin[0])
// or
// calcGridItemWHPx(h, rowHeight, margin[1])
export function calcGridItemWHPx(
gridUnits: number,
colOrRowSize: number,
marginPx: number
): number {
// 0 * Infinity === NaN, which causes problems with resize contraints
if (!Number.isFinite(gridUnits)) return gridUnits;
return Math.round(
colOrRowSize * gridUnits + Math.max(0, gridUnits - 1) * marginPx
);
}
/**
* Return position on the page given an x, y, w, h.
* left, top, width, height are all in pixels.
* @param {PositionParams} positionParams Parameters of grid needed for coordinates calculations.
* @param {Number} x X coordinate in grid units.
* @param {Number} y Y coordinate in grid units.
* @param {Number} w W coordinate in grid units.
* @param {Number} h H coordinate in grid units.
* @return {Position} Object containing coords.
*/
export function calcGridItemPosition(
positionParams: PositionParams,
x: number,
y: number,
w: number,
h: number,
state: ?Object
): Position {
const { margin, containerPadding, rowHeight } = positionParams;
const colWidth = calcGridColWidth(positionParams);
const out = {};
// If resizing, use the exact width and height as returned from resizing callbacks.
if (state && state.resizing) {
out.width = Math.round(state.resizing.width);
out.height = Math.round(state.resizing.height);
}
// Otherwise, calculate from grid units.
else {
out.width = calcGridItemWHPx(w, colWidth, margin[0]);
out.height = calcGridItemWHPx(h, rowHeight, margin[1]);
}
// If dragging, use the exact width and height as returned from dragging callbacks.
if (state && state.dragging) {
out.top = Math.round(state.dragging.top);
out.left = Math.round(state.dragging.left);
} else if (
state &&
state.resizing &&
typeof state.resizing.top === "number" &&
typeof state.resizing.left === "number"
) {
out.top = Math.round(state.resizing.top);
out.left = Math.round(state.resizing.left);
}
// Otherwise, calculate from grid units.
else {
out.top = Math.round((rowHeight + margin[1]) * y + containerPadding[1]);
out.left = Math.round((colWidth + margin[0]) * x + containerPadding[0]);
}
return out;
}
/**
* Translate x and y coordinates from pixels to grid units.
* @param {PositionParams} positionParams Parameters of grid needed for coordinates calculations.
* @param {Number} top Top position (relative to parent) in pixels.
* @param {Number} left Left position (relative to parent) in pixels.
* @param {Number} w W coordinate in grid units.
* @param {Number} h H coordinate in grid units.
* @return {Object} x and y in grid units.
*/
export function calcXY(
positionParams: PositionParams,
top: number,
left: number,
w: number,
h: number
): { x: number, y: number } {
const { margin, containerPadding, cols, rowHeight, maxRows } = positionParams;
const colWidth = calcGridColWidth(positionParams);
// left = containerPaddingX + x * (colWidth + marginX)
// x * (colWidth + marginX) = left - containerPaddingX
// x = (left - containerPaddingX) / (colWidth + marginX)
let x = Math.round((left - containerPadding[0]) / (colWidth + margin[0]));
let y = Math.round((top - containerPadding[1]) / (rowHeight + margin[1]));
// Capping
x = clamp(x, 0, cols - w);
y = clamp(y, 0, maxRows - h);
return { x, y };
}
/**
* Given a height and width in pixel values, calculate grid units.
* @param {PositionParams} positionParams Parameters of grid needed for coordinates calcluations.
* @param {Number} height Height in pixels.
* @param {Number} width Width in pixels.
* @param {Number} x X coordinate in grid units.
* @param {Number} y Y coordinate in grid units.
* @param {String} handle Resize Handle.
* @return {Object} w, h as grid units.
*/
export function calcWH(
positionParams: PositionParams,
width: number,
height: number,
x: number,
y: number,
handle: string
): { w: number, h: number } {
const { margin, maxRows, cols, rowHeight } = positionParams;
const colWidth = calcGridColWidth(positionParams);
// width = colWidth * w - (margin * (w - 1))
// ...
// w = (width + margin) / (colWidth + margin)
let w = Math.round((width + margin[0]) / (colWidth + margin[0]));
let h = Math.round((height + margin[1]) / (rowHeight + margin[1]));
// Capping
let _w = clamp(w, 0, cols - x);
let _h = clamp(h, 0, maxRows - y);
if (["sw", "w", "nw"].indexOf(handle) !== -1) {
_w = clamp(w, 0, cols);
}
if (["nw", "n", "ne"].indexOf(handle) !== -1) {
_h = clamp(h, 0, maxRows);
}
return { w: _w, h: _h };
}
// Similar to _.clamp
export function clamp(
num: number,
lowerBound: number,
upperBound: number
): number {
return Math.max(Math.min(num, upperBound), lowerBound);
}
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