2015-04-12 20:03:17 +00:00
|
|
|
// Utility functions used elsewhere in the codebase. Most JavaScript files on
|
|
|
|
// the site use some functions defined in this file.
|
|
|
|
|
2014-12-19 17:06:21 +00:00
|
|
|
import _ from 'lodash';
|
|
|
|
|
2015-04-12 20:03:17 +00:00
|
|
|
// Generate an `Event` object for triggering a custom event.
|
|
|
|
//
|
|
|
|
// - __name__ - Name of the custom event. This should be a String.
|
|
|
|
// - __detail__ - Event details. The event details are provided to the event
|
|
|
|
// handler.
|
2014-12-20 15:25:32 +00:00
|
|
|
function customEvent(name, detail) {
|
2014-12-19 15:24:45 +00:00
|
|
|
var evt = document.createEvent('Event');
|
|
|
|
evt.initEvent(name, true, true);
|
|
|
|
evt.detail = detail;
|
|
|
|
return evt;
|
|
|
|
}
|
2014-12-19 17:06:21 +00:00
|
|
|
|
2015-04-12 20:03:17 +00:00
|
|
|
// Add extra fields to a bounding box returned by `getBBox`. Specifically adds
|
|
|
|
// details about the box's axis points (used when positioning elements for
|
|
|
|
// display).
|
|
|
|
//
|
|
|
|
// - __box__ - Bounding box object to update. Attributes `ax`, `ax2`, and `ay`
|
|
|
|
// will be added if they are not already defined.
|
2014-12-20 15:25:32 +00:00
|
|
|
function normalizeBBox(box) {
|
2014-12-19 17:06:21 +00:00
|
|
|
return _.extend({
|
|
|
|
ax: box.x,
|
|
|
|
ax2: box.x2,
|
|
|
|
ay: box.cy
|
|
|
|
}, box);
|
|
|
|
}
|
2014-12-19 17:11:44 +00:00
|
|
|
|
2015-04-12 20:03:17 +00:00
|
|
|
// Positions a collection of items with their axis points aligned along a
|
|
|
|
// horizontal line. This leads to the items being spaced horizontally and
|
|
|
|
// effectively centered vertically.
|
|
|
|
//
|
|
|
|
// - __items__ - Array of items to be positioned
|
|
|
|
// - __options.padding__ - Number of pixels to leave between items
|
2014-12-20 15:25:32 +00:00
|
|
|
function spaceHorizontally(items, options) {
|
2014-12-19 17:11:44 +00:00
|
|
|
var verticalCenter = 0;
|
|
|
|
|
|
|
|
options = _.defaults(options || {}, {
|
|
|
|
padding: 0
|
|
|
|
});
|
|
|
|
|
2015-04-12 20:03:17 +00:00
|
|
|
// Set horizontal position of items with padding between them, and calculate
|
|
|
|
// where the axis points should be positioned vertically.
|
2014-12-19 17:11:44 +00:00
|
|
|
_.reduce(items, (offset, item) => {
|
|
|
|
var box;
|
|
|
|
|
|
|
|
item.transform(Snap.matrix()
|
|
|
|
.translate(offset, 0));
|
|
|
|
|
|
|
|
box = normalizeBBox(item.getBBox());
|
|
|
|
verticalCenter = Math.max(verticalCenter, box.ay);
|
|
|
|
|
|
|
|
return offset + options.padding + box.width;
|
|
|
|
}, 0);
|
|
|
|
|
2015-04-12 20:03:17 +00:00
|
|
|
// Set vertical position of items to align their axis points.
|
2014-12-19 17:11:44 +00:00
|
|
|
for (var item of items) {
|
|
|
|
let box = normalizeBBox(item.getBBox());
|
|
|
|
|
|
|
|
item.transform(Snap.matrix()
|
|
|
|
.add(item.transform().localMatrix)
|
|
|
|
.translate(0, verticalCenter - box.ay));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-04-12 20:03:17 +00:00
|
|
|
// Positions a collection of items centered horizontally in a vertical stack.
|
|
|
|
//
|
|
|
|
// - __items__ - Array of items to be positioned
|
|
|
|
// - __options.padding__ - Number of pixels to leave between items
|
2014-12-20 15:25:32 +00:00
|
|
|
function spaceVertically(items, options) {
|
2014-12-19 17:11:44 +00:00
|
|
|
var horizontalCenter = 0;
|
|
|
|
|
|
|
|
options = _.defaults(options || {}, {
|
|
|
|
padding: 0
|
|
|
|
});
|
|
|
|
|
2015-04-12 20:03:17 +00:00
|
|
|
// Set vertical position of items with padding between them, and calculate
|
|
|
|
// where the center of each item should be positioned horizontally.
|
2014-12-19 17:11:44 +00:00
|
|
|
_.reduce(items, (offset, item) => {
|
|
|
|
var box;
|
|
|
|
|
|
|
|
item.transform(Snap.matrix()
|
|
|
|
.translate(0, offset));
|
|
|
|
|
|
|
|
box = item.getBBox();
|
|
|
|
|
|
|
|
horizontalCenter = Math.max(horizontalCenter, box.cx);
|
|
|
|
|
|
|
|
return offset + options.padding + box.height;
|
|
|
|
}, 0);
|
|
|
|
|
2015-04-12 20:03:17 +00:00
|
|
|
// Set horizontal position of items to align their centers.
|
2014-12-19 17:11:44 +00:00
|
|
|
for (var item of items) {
|
|
|
|
item.transform(Snap.matrix()
|
|
|
|
.add(item.transform().localMatrix)
|
|
|
|
.translate(horizontalCenter - item.getBBox().cx, 0));
|
|
|
|
}
|
|
|
|
}
|
2014-12-20 15:18:00 +00:00
|
|
|
|
2015-04-12 20:03:17 +00:00
|
|
|
// Creates a Promise that will be resolved after a specified delay.
|
|
|
|
//
|
|
|
|
// - __delay__ - Time in milliseconds to wait before resolving promise.
|
2015-03-14 21:27:59 +00:00
|
|
|
function wait(delay) {
|
|
|
|
return new Promise((resolve, reject) => {
|
|
|
|
setTimeout(resolve, delay);
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
2015-04-12 20:03:17 +00:00
|
|
|
// Creates a Promise that will be resolved after 0 milliseconds. This is used
|
|
|
|
// to create a short delay that allows the browser to address any pending tasks
|
|
|
|
// while the JavaScript VM is not active.
|
2015-03-14 21:27:59 +00:00
|
|
|
function tick() {
|
|
|
|
return wait(0);
|
|
|
|
}
|
|
|
|
|
2015-04-12 20:03:17 +00:00
|
|
|
// Re-throws an exception asynchronously. This is used to expose an exception
|
|
|
|
// that was created during a Promise operation to be handled by global error
|
|
|
|
// handlers (and to be displayed in the browser's debug console).
|
|
|
|
//
|
|
|
|
// - __error__ - Error/exception object to be re-thrown to the browser.
|
2015-03-14 21:27:59 +00:00
|
|
|
function exposeError(error) {
|
|
|
|
tick().then(() => {
|
|
|
|
throw error;
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
2014-12-20 15:18:00 +00:00
|
|
|
export default {
|
|
|
|
customEvent,
|
|
|
|
normalizeBBox,
|
|
|
|
spaceHorizontally,
|
2015-03-14 21:27:59 +00:00
|
|
|
spaceVertically,
|
|
|
|
wait,
|
|
|
|
tick,
|
|
|
|
exposeError
|
2014-12-20 15:18:00 +00:00
|
|
|
};
|