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phab/webroot/rsrc/js/core/behavior-device.js
4c03f617fce8feature/better-testing

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behavior-device.js
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/**
* @provides javelin-behavior-device
* @requires javelin-behavior
* javelin-stratcom
* javelin-dom
* javelin-vector
* javelin-install
*/
JX.install('Device', {
statics : {
_device : null,
_tabletBreakpoint: 920,
setTabletBreakpoint: function(width) {
var self = JX.Device;
self._tabletBreakpoint = width;
self.recalculate();
},
getTabletBreakpoint: function() {
return JX.Device._tabletBreakpoint;
},
recalculate: function() {
var v = JX.Vector.getViewport();
var self = JX.Device;
// Even when we emit a '<meta name="viewport" ... />' tag which tells
// devices to fit the conent to the screen width, we'll sometimes measure
// a viewport dimension which is larger than the available screen width,
// particularly if we check too early.
// If the device provides a screen width and the screen width is smaller
// than the viewport width, use the screen width.
var screen_width = (window.screen && window.screen.availWidth);
if (screen_width) {
v.x = Math.min(v.x, screen_width);
}
var device = 'desktop';
if (v.x <= self._tabletBreakpoint) {
device = 'tablet';
}
if (v.x <= 480) {
device = 'phone';
}
if (device == self._device) {
return;
}
self._device = device;
var e = document.body;
JX.DOM.alterClass(e, 'device-phone', (device == 'phone'));
JX.DOM.alterClass(e, 'device-tablet', (device == 'tablet'));
JX.DOM.alterClass(e, 'device-desktop', (device == 'desktop'));
JX.DOM.alterClass(e, 'device', (device != 'desktop'));
JX.Stratcom.invoke('phabricator-device-change', null, device);
},
isDesktop: function() {
var self = JX.Device;
return (self.getDevice() == 'desktop');
},
getDevice : function() {
var self = JX.Device;
if (self._device === null) {
self.recalculate();
}
return self._device;
}
}
});
JX.behavior('device', function() {
JX.Stratcom.listen('resize', null, JX.Device.recalculate);
JX.Device.recalculate();
});
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