@instructure/canvas-rce
Version:
A component wrapping Canvas's usage of Tinymce
57 lines (56 loc) • 2 kB
JavaScript
/*
* Copyright (C) 2019 - present Instructure, Inc.
*
* This file is part of Canvas.
*
* Canvas is free software: you can redistribute it and/or modify it under
* the terms of the GNU Affero General Public License as published by the Free
* Software Foundation, version 3 of the License.
*
* Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
* details.
*
* You should have received a copy of the GNU Affero General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
function scaleEvenly(width, height, scaleFactor, constraints) {
const minHeight = constraints.minHeight || 0;
const minWidth = constraints.minWidth || 0;
const scaledWidth = width * scaleFactor;
const scaledHeight = height * scaleFactor;
let minimumScaleFactor = scaleFactor;
if (scaledWidth < minWidth) {
const atLeastMinWidth = Math.max(scaledWidth, minWidth);
minimumScaleFactor = atLeastMinWidth / width;
}
if (scaledHeight < minHeight) {
const atLeastMinHeight = Math.max(scaledHeight, minHeight);
minimumScaleFactor = Math.max(atLeastMinHeight / height, minimumScaleFactor);
}
return {
height: Math.round(height * minimumScaleFactor),
width: Math.round(width * minimumScaleFactor)
};
}
export function scaleForHeight(width, height, targetHeight, constraints = {}) {
if (targetHeight == null) {
return {
height: null,
width: null
};
}
const scaleFactor = targetHeight / height;
return scaleEvenly(width, height, scaleFactor, constraints);
}
export function scaleForWidth(width, height, targetWidth, constraints = {}) {
if (targetWidth == null) {
return {
height: null,
width: null
};
}
const scaleFactor = targetWidth / width;
return scaleEvenly(width, height, scaleFactor, constraints);
}