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Merge remote-tracking branch 'upstream/master' into feature-replace-logo

This commit is contained in:
Kiripolszky Károly 2018-04-04 22:01:47 +02:00
commit 365b05987f
47 changed files with 19829 additions and 3968 deletions

View file

@ -1,6 +1,7 @@
'use strict';
var SYM = SYM || {};
SYM.BLANK = 0x20;
SYM.VOLT = 0x06;
SYM.RSSI = 0x01;
SYM.AH_RIGHT = 0x02;
@ -587,6 +588,7 @@ OSD.constants = {
name: 'MAIN_BATT_VOLTAGE',
desc: 'osdDescElementMainBattVoltage',
default_position: -29,
draw_order: 20,
positionable: true,
preview: FONT.symbol(SYM.BATTERY) + '16.8' + FONT.symbol(SYM.VOLT)
},
@ -594,6 +596,7 @@ OSD.constants = {
name: 'RSSI_VALUE',
desc: 'osdDescElementRssiValue',
default_position: -59,
draw_order: 30,
positionable: true,
preview: FONT.symbol(SYM.RSSI) + '99'
},
@ -607,6 +610,7 @@ OSD.constants = {
name: 'THROTTLE_POSITION',
desc: 'osdDescElementThrottlePosition',
default_position: -9,
draw_order: 110,
positionable: true,
preview: FONT.symbol(SYM.THR) + FONT.symbol(SYM.THR1) + '69'
},
@ -619,6 +623,7 @@ OSD.constants = {
VTX_CHANNEL: {
name: 'VTX_CHANNEL',
default_position: 1,
draw_order: 120,
positionable: true,
preview: 'R:2:1'
},
@ -639,31 +644,88 @@ OSD.constants = {
name: 'DISARMED',
desc: 'osdDescElementDisarmed',
default_position: -109,
draw_order: 280,
positionable: true,
preview: 'DISARMED'
},
CROSSHAIRS: {
name: 'CROSSHAIRS',
desc: 'osdDescElementCrosshairs',
default_position: -1,
positionable: false
default_position: 193,
draw_order: 40,
positionable: function() {
return semver.gte(CONFIG.apiVersion, "1.38.0") ? true : false;
},
preview: FONT.symbol(SYM.AH_CENTER_LINE) + FONT.symbol(SYM.AH_CENTER) + FONT.symbol(SYM.AH_CENTER_LINE_RIGHT)
},
ARTIFICIAL_HORIZON: {
name: 'ARTIFICIAL_HORIZON',
desc: 'osdDescElementArtificialHorizon',
default_position: -1,
positionable: false
default_position: 194,
draw_order: 10,
positionable: function() {
return semver.gte(CONFIG.apiVersion, "1.38.0") ? true : false;
},
preview: function() {
var artificialHorizon = new Array();
for (var j = 1; j < 8; j++) {
for (var i = -4; i <= 4; i++) {
var element;
// Blank char to mark the size of the element
if (j != 4) {
element = {x: i, y : j, sym : SYM.BLANK};
// Sample of horizon
} else {
element = {x: i, y : j, sym : SYM.AH_BAR9_0 + 4};
}
artificialHorizon.push(element);
}
}
return artificialHorizon;
}
},
HORIZON_SIDEBARS: {
name: 'HORIZON_SIDEBARS',
desc: 'osdDescElementHorizonSidebars',
default_position: -1,
positionable: false
default_position: 194,
draw_order: 50,
positionable: function() {
return semver.gte(CONFIG.apiVersion, "1.38.0") ? true : false;
},
preview: function(fieldPosition) {
var horizonSidebar = new Array();
var hudwidth = OSD.constants.AHISIDEBARWIDTHPOSITION;
var hudheight = OSD.constants.AHISIDEBARHEIGHTPOSITION;
for (var i = -hudheight; i <= hudheight; i++) {
var element = {x: -hudwidth, y : i, sym : SYM.AH_DECORATION};
horizonSidebar.push(element);
element = {x: hudwidth, y : i, sym : SYM.AH_DECORATION};
horizonSidebar.push(element);
}
// AH level indicators
var element = {x: -hudwidth + 1, y : 0, sym : SYM.AH_LEFT};
horizonSidebar.push(element);
element = {x: hudwidth - 1, y : 0, sym : SYM.AH_RIGHT};
horizonSidebar.push(element);
return horizonSidebar;
}
},
CURRENT_DRAW: {
name: 'CURRENT_DRAW',
desc: 'osdDescElementCurrentDraw',
default_position: -23,
draw_order: 130,
positionable: true,
preview: function() {
return semver.gte(CONFIG.apiVersion, "1.36.0") ? ' 42.00' + FONT.symbol(SYM.AMP) : FONT.symbol(SYM.AMP) + '42.0';
@ -673,6 +735,7 @@ OSD.constants = {
name: 'MAH_DRAWN',
desc: 'osdDescElementMahDrawn',
default_position: -18,
draw_order: 140,
positionable: true,
preview: function() {
return semver.gte(CONFIG.apiVersion, "1.36.0") ? ' 690' + FONT.symbol(SYM.MAH) : FONT.symbol(SYM.MAH) + '690';
@ -682,6 +745,7 @@ OSD.constants = {
name: 'CRAFT_NAME',
desc: 'osdDescElementCraftName',
default_position: -77,
draw_order: 150,
positionable: true,
preview: function(osd_data) {
return OSD.generateCraftName(osd_data, 1);
@ -691,6 +755,7 @@ OSD.constants = {
name: 'ALTITUDE',
desc: 'osdDescElementAltitude',
default_position: 62,
draw_order: 160,
positionable: true,
preview: function(osd_data) {
return '399.7' + FONT.symbol(osd_data.unit_mode === 0 ? SYM.FEET : SYM.METRE)
@ -714,6 +779,7 @@ OSD.constants = {
name: 'FLYMODE',
desc: 'osdDescElementFlyMode',
default_position: -1,
draw_order: 90,
positionable: true,
preview: 'STAB'
},
@ -721,6 +787,7 @@ OSD.constants = {
name: 'GPS_SPEED',
desc: 'osdDescElementGPSSpeed',
default_position: -1,
draw_order: 330,
positionable: true,
preview: ' 40K'
},
@ -728,6 +795,7 @@ OSD.constants = {
name: 'GPS_SATS',
desc: 'osdDescElementGPSSats',
default_position: -1,
draw_order: 320,
positionable: true,
preview: FONT.symbol(SYM.GPS_SAT_L) + FONT.symbol(SYM.GPS_SAT_R) + '14'
},
@ -735,6 +803,7 @@ OSD.constants = {
name: 'GPS_LON',
desc: 'osdDescElementGPSLon',
default_position: -1,
draw_order: 350,
positionable: true,
preview: FONT.symbol(SYM.ARROW_SOUTH) + '00.00000000'
},
@ -742,6 +811,7 @@ OSD.constants = {
name: 'GPS_LAT',
desc: 'osdDescElementGPSLat',
default_position: -1,
draw_order: 340,
positionable: true,
preview: FONT.symbol(SYM.ARROW_EAST) + '00.00000000'
},
@ -749,6 +819,7 @@ OSD.constants = {
name: 'DEBUG',
desc: 'osdDescElementDebug',
default_position: -1,
draw_order: 240,
positionable: true,
preview: 'DBG 0 0 0 0'
},
@ -756,6 +827,7 @@ OSD.constants = {
name: 'PID_ROLL',
desc: 'osdDescElementPIDRoll',
default_position: 0x800 | (10 << 5) | 2, // 0x0800 | (y << 5) | x
draw_order: 170,
positionable: true,
preview: 'ROL 43 40 20'
},
@ -763,6 +835,7 @@ OSD.constants = {
name: 'PID_PITCH',
desc: 'osdDescElementPIDPitch',
default_position: 0x800 | (11 << 5) | 2, // 0x0800 | (y << 5) | x
draw_order: 180,
positionable: true,
preview: 'PIT 58 50 22'
},
@ -770,6 +843,7 @@ OSD.constants = {
name: 'PID_YAW',
desc: 'osdDescElementPIDYaw',
default_position: 0x800 | (12 << 5) | 2, // 0x0800 | (y << 5) | x
draw_order: 190,
positionable: true,
preview: 'YAW 70 45 20'
},
@ -777,6 +851,7 @@ OSD.constants = {
name: 'POWER',
desc: 'osdDescElementPower',
default_position: (15 << 5) | 2,
draw_order: 200,
positionable: true,
preview: function() {
return semver.gte(CONFIG.apiVersion, "1.36.0") ? ' 142W' : '142W';
@ -786,13 +861,14 @@ OSD.constants = {
name: 'PID_RATE_PROFILE',
desc: 'osdDescElementPIDRateProfile',
default_position: 0x800 | (13 << 5) | 2, // 0x0800 | (y << 5) | x
draw_order: 210,
positionable: true,
preview: '1-2'
},
BATTERY_WARNING: {
name: 'BATTERY_WARNING',
desc: 'osdDescElementBatteryWarning',
default_position: -1,
default_position: -1,
positionable: true,
preview: 'LOW VOLTAGE'
},
@ -800,6 +876,7 @@ OSD.constants = {
name: 'AVG_CELL_VOLTAGE',
desc: 'osdDescElementAvgCellVoltage',
default_position: 12 << 5,
draw_order: 230,
positionable: true,
preview: FONT.symbol(SYM.BATTERY) + '3.98' + FONT.symbol(SYM.VOLT)
},
@ -807,6 +884,7 @@ OSD.constants = {
name: 'PITCH_ANGLE',
desc: 'osdDescElementPitchAngle',
default_position: -1,
draw_order: 250,
positionable: true,
preview: '-00.0'
},
@ -814,6 +892,7 @@ OSD.constants = {
name: 'ROLL_ANGLE',
desc: 'osdDescElementRollAngle',
default_position: -1,
draw_order: 260,
positionable: true,
preview: '-00.0'
},
@ -821,6 +900,7 @@ OSD.constants = {
name: 'MAIN_BATT_USAGE',
desc: 'osdDescElementMainBattUsage',
default_position: -17,
draw_order: 270,
positionable: true,
preview: FONT.symbol(SYM.PB_START) + FONT.symbol(SYM.PB_FULL) + FONT.symbol(SYM.PB_FULL) + FONT.symbol(SYM.PB_FULL) + FONT.symbol(SYM.PB_FULL) + FONT.symbol(SYM.PB_FULL) + FONT.symbol(SYM.PB_FULL) + FONT.symbol(SYM.PB_FULL) + FONT.symbol(SYM.PB_FULL) + FONT.symbol(SYM.PB_FULL) + FONT.symbol(SYM.PB_END) + FONT.symbol(SYM.PB_EMPTY) + FONT.symbol(SYM.PB_CLOSE)
},
@ -835,6 +915,7 @@ OSD.constants = {
name: 'HOME_DIRECTION',
desc: 'osdDescElementHomeDirection',
default_position: -1,
draw_order: 370,
positionable: true,
preview: FONT.symbol(SYM.ARROW_SOUTH + 2)
},
@ -842,6 +923,7 @@ OSD.constants = {
name: 'HOME_DISTANCE',
desc: 'osdDescElementHomeDistance',
default_position: -1,
draw_order: 360,
positionable: true,
preview: function(osd_data) {
return '43' + FONT.symbol(osd_data.unit_mode === 0 ? SYM.FEET : SYM.METRE)
@ -851,6 +933,7 @@ OSD.constants = {
name: 'NUMERICAL_HEADING',
desc: 'osdDescElementNumericalHeading',
default_position: -1,
draw_order: 290,
positionable: true,
preview: FONT.symbol(SYM.ARROW_EAST) + '90'
},
@ -858,6 +941,7 @@ OSD.constants = {
name: 'NUMERICAL_VARIO',
desc: 'osdDescElementNumericalVario',
default_position: -1,
draw_order: 300,
positionable: true,
preview: FONT.symbol(SYM.ARROW_NORTH) + '8.7'
},
@ -865,6 +949,7 @@ OSD.constants = {
name: 'COMPASS_BAR',
desc: 'osdDescElementCompassBar',
default_position: -1,
draw_order: 310,
positionable: true,
preview: function(osd_data) {
return FONT.symbol(SYM.HEADING_W) + FONT.symbol(SYM.HEADING_LINE) + FONT.symbol(SYM.HEADING_DIVIDED_LINE) +
@ -876,6 +961,7 @@ OSD.constants = {
name: 'WARNINGS',
desc: 'osdDescElementWarnings',
default_position: -1,
draw_order: 220,
positionable: true,
preview: 'LOW VOLTAGE'
},
@ -883,6 +969,7 @@ OSD.constants = {
name: 'ESC_TEMPERATURE',
desc: 'osdDescElementEscTemperature',
default_position: -1,
draw_order: 380,
positionable: true,
preview: FONT.symbol(SYM.TEMP_C) + '45'
},
@ -890,6 +977,7 @@ OSD.constants = {
name: 'ESC_RPM',
desc: 'osdDescElementEscRpm',
default_position: -1,
draw_order: 390,
positionable: true,
preview: '226000'
},
@ -897,6 +985,7 @@ OSD.constants = {
name: 'REMAINING_TIME_ESTIMATE',
desc: 'osdDescElementRemaningTimeEstimate',
default_position: -1,
draw_order: 80,
positionable: true,
preview: '01:13'
},
@ -904,6 +993,7 @@ OSD.constants = {
name: 'RTC_DATE_TIME',
desc: 'osdDescElementRtcDateTime',
default_position: -1,
draw_order: 400,
positionable: true,
preview: '2017-11-11 16:20:00'
},
@ -911,6 +1001,7 @@ OSD.constants = {
name: 'ADJUSTMENT_RANGE',
desc: 'osdDescElementAdjustmentRange',
default_position: -1,
draw_order: 410,
positionable: true,
preview: 'PITCH/ROLL P: 42'
},
@ -918,6 +1009,7 @@ OSD.constants = {
name: 'TIMER_1',
desc: 'osdDescElementTimer1',
default_position: -1,
draw_order: 60,
positionable: true,
preview: function(osd_data) {
return OSD.generateTimerPreview(osd_data, 0);
@ -927,6 +1019,7 @@ OSD.constants = {
name: 'TIMER_2',
desc: 'osdDescElementTimer2',
default_position: -1,
draw_order: 70,
positionable: true,
preview: function(osd_data) {
return OSD.generateTimerPreview(osd_data, 1);
@ -936,6 +1029,7 @@ OSD.constants = {
name: 'CORE_TEMPERATURE',
desc: 'osdDescElementCoreTemperature',
default_position: -1,
draw_order: 420,
positionable: true,
preview: function(osd_data) {
return OSD.generateTemperaturePreview(osd_data, 33);
@ -1009,6 +1103,10 @@ OSD.constants = {
RTC_DATE_TIME: {
name: 'RTC_DATE_TIME',
desc: 'osdDescStatRtcDateTime'
},
STAT_BATTERY: {
name: 'STAT_BATTERY',
desc: 'osdDescStatBattery'
}
},
ALL_WARNINGS: {
@ -1035,7 +1133,12 @@ OSD.constants = {
CRASH_FLIP_MODE: {
name: 'CRASH_FLIP_MODE',
desc: 'osdWarningCrashFlipMode'
},
ESC_FAIL: {
name: 'OSD_WARNING_ESC_FAIL',
desc: 'osdWarningEscFail'
}
},
FONT_TYPES: [
{ file: "default", name: "Default" },
@ -1048,6 +1151,20 @@ OSD.constants = {
]
};
OSD.searchLimitsElement = function(arrayElements) {
// Search minimum and maximum
var limits = {minX: 0, maxX: 0, minY:0, maxY: 0};
arrayElements.forEach(function(valor, indice, array) {
limits.minX = Math.min(valor.x, limits.minX);
limits.maxX = Math.max(valor.x, limits.maxX);
limits.minY = Math.min(valor.y, limits.minY);
limits.maxY = Math.max(valor.y, limits.maxY);
});
return limits;
}
// Pick display fields by version, order matters, so these are going in an array... pry could iterate the example map instead
OSD.chooseFields = function () {
var F = OSD.constants.ALL_DISPLAY_FIELDS;
@ -1176,6 +1293,11 @@ OSD.chooseFields = function () {
OSD.constants.STATISTIC_FIELDS = OSD.constants.STATISTIC_FIELDS.concat([
F.RTC_DATE_TIME
]);
if (semver.gte(CONFIG.apiVersion, "1.38.0")) {
OSD.constants.STATISTIC_FIELDS = OSD.constants.STATISTIC_FIELDS.concat([
F.STAT_BATTERY
]);
}
}
// Choose warnings
@ -1189,6 +1311,11 @@ OSD.chooseFields = function () {
F.VISUAL_BEEPER,
F.CRASH_FLIP_MODE
];
if (semver.gte(CONFIG.apiVersion, "1.39.0")) {
OSD.constants.WARNINGS = OSD.constants.WARNINGS.concat([
F.ESC_FAIL
]);
}
};
OSD.updateDisplaySize = function() {
@ -1204,6 +1331,24 @@ OSD.updateDisplaySize = function() {
};
};
OSD.drawByOrder = function(selectedPosition, field, charCode) {
// Check if there is other field at the same position
if (OSD.data.preview[selectedPosition] !== undefined) {
var oldField = OSD.data.preview[selectedPosition][0];
if (oldField != null) {
if (oldField.draw_order !== undefined) {
if ((field.draw_order === undefined) || (field.draw_order < oldField.draw_order)) {
// Not overwrite old field
return;
}
}
}
// Default action, overwrite old field
OSD.data.preview[selectedPosition++] = [field, charCode];
}
}
OSD.msp = {
/**
@ -1363,6 +1508,7 @@ OSD.msp = {
name: suffix ? c.name + suffix : c.name,
desc: c.desc,
index: j,
draw_order: c.draw_order,
positionable: c.positionable,
preview: suffix ? c.preview + suffix : c.preview
}, this.helpers.unpack.position(v, c)));
@ -1417,11 +1563,14 @@ OSD.msp = {
}
}
// Generate OSD element previews that are defined by a function
// Generate OSD element previews and positionable that are defined by a function
for (let item of d.display_items) {
if (typeof(item.preview) === 'function') {
item.preview = item.preview(d);
}
if (typeof(item.positionable) === 'function') {
item.positionable = item.positionable(d);
}
}
OSD.updateDisplaySize();
@ -1440,8 +1589,18 @@ OSD.GUI.preview = {
},
onDragStart: function(e) {
var ev = e.originalEvent;
var display_item = OSD.data.display_items[$(ev.target).data('field').index];
var offsetX = 6;
var offsetY = 9;
if (display_item.preview.constructor === Array) {
var arrayElements = display_item.preview;
var limits = OSD.searchLimitsElement(arrayElements);
offsetX -= limits.minX*12;
offsetY -= limits.minY*12;
}
ev.dataTransfer.setData("text/plain", $(ev.target).data('field').index);
ev.dataTransfer.setDragImage($(this).data('field').preview_img, 6, 9);
ev.dataTransfer.setDragImage($(this).data('field').preview_img, offsetX, offsetY);
},
onDragOver: function(e) {
var ev = e.originalEvent;
@ -1460,10 +1619,35 @@ OSD.GUI.preview = {
var position = $(this).removeAttr('style').data('position');
var field_id = parseInt(ev.dataTransfer.getData('text/plain'))
var display_item = OSD.data.display_items[field_id];
var overflows_line = FONT.constants.SIZES.LINE - ((position % FONT.constants.SIZES.LINE) + display_item.preview.length);
if (overflows_line < 0) {
position += overflows_line;
var overflows_line = 0;
// Standard preview, string type
if (display_item.preview.constructor !== Array) {
overflows_line = FONT.constants.SIZES.LINE - ((position % FONT.constants.SIZES.LINE) + display_item.preview.length);
if (overflows_line < 0) {
position += overflows_line;
}
// Advanced preview, array type
} else {
var arrayElements = display_item.preview;
var limits = OSD.searchLimitsElement(arrayElements);
var selectedPositionX = position % FONT.constants.SIZES.LINE;
var selectedPositionY = Math.trunc(position / FONT.constants.SIZES.LINE);
if ((limits.minX < 0) && ((selectedPositionX + limits.minX) < 0)) {
position += Math.abs(selectedPositionX + limits.minX);
} else if ((limits.maxX > 0) && ((selectedPositionX + limits.maxX) >= FONT.constants.SIZES.LINE)) {
position -= (selectedPositionX + limits.maxX + 1) - FONT.constants.SIZES.LINE;
}
if ((limits.minY < 0) && ((selectedPositionY + limits.minY) < 0)) {
position += Math.abs(selectedPositionY + limits.minY)*FONT.constants.SIZES.LINE;
} else if ((limits.maxY > 0) && ((selectedPositionY + limits.maxY) >= OSD.data.display_size.y)) {
position -= (selectedPositionY + limits.maxY - OSD.data.display_size.y + 1)*FONT.constants.SIZES.LINE;
}
}
if (semver.gte(CONFIG.apiVersion, "1.21.0")) {
// unsigned now
} else {
@ -1846,53 +2030,75 @@ TABS.osd.initialize = function (callback) {
OSD.data.preview[i * 30 + j] = [{name: 'LOGO', positionable: false}, x++];
}
}
// draw all the displayed items and the drag and drop preview images
for(let field of OSD.data.display_items) {
if (!field.preview || !field.isVisible) { continue; }
var j = (field.position >= 0) ? field.position : field.position + OSD.data.display_size.total;
if (!field.preview || !field.isVisible) {
continue;
}
var selectedPosition = (field.position >= 0) ? field.position : field.position + OSD.data.display_size.total;
// create the preview image
field.preview_img = new Image();
var canvas = document.createElement('canvas');
var ctx = canvas.getContext("2d");
// fill the screen buffer
for(var i = 0; i < field.preview.length; i++) {
var charCode = field.preview.charCodeAt(i);
OSD.data.preview[j++] = [field, charCode];
// draw the preview
var img = new Image();
img.src = FONT.draw(charCode);
ctx.drawImage(img, i*12, 0);
// Standard preview, type String
if (field.preview.constructor !== Array) {
// fill the screen buffer
for(var i = 0; i < field.preview.length; i++) {
// Add the character to the preview
var charCode = field.preview.charCodeAt(i);
OSD.drawByOrder(selectedPosition++, field, charCode);
// Image used when "dragging" the element
if (field.positionable) {
var img = new Image();
img.src = FONT.draw(charCode);
ctx.drawImage(img, i*12, 0);
}
}
} else {
var arrayElements = field.preview;
// The array can have negative and positive positions, search limits...
var limits = OSD.searchLimitsElement(arrayElements);
var offsetX = 0;
var offsetY = 0;
if (limits.minX < 0) {
offsetX = -limits.minX;
}
if (limits.minY < 0) {
offsetY = -limits.minY;
}
for (var i=0; i < arrayElements.length; i++) {
// Add the character to the preview
var element = arrayElements[i];
var charCode = element.sym;
OSD.drawByOrder(selectedPosition + element.x + element.y*FONT.constants.SIZES.LINE, field, charCode);
// Image used when "dragging" the element
if (field.positionable) {
var img = new Image();
img.src = FONT.draw(charCode);
ctx.drawImage(img, (element.x + offsetX)*12, (element.y + offsetY)*12);
}
}
}
field.preview_img.src = canvas.toDataURL('image/png');
// Required for NW.js - Otherwise the <img /> will
// consume drag/drop events.
field.preview_img.style.pointerEvents = 'none';
}
var centerishPosition = 194;
// artificial horizon
if ($('input[name="ARTIFICIAL_HORIZON"]').prop('checked')) {
for (var i = 0; i < 9; i++) {
OSD.data.preview[centerishPosition - 4 + i] = SYM.AH_BAR9_0 + 4;
}
}
// crosshairs
if ($('input[name="CROSSHAIRS"]').prop('checked')) {
OSD.data.preview[centerishPosition - 1] = SYM.AH_CENTER_LINE;
OSD.data.preview[centerishPosition + 1] = SYM.AH_CENTER_LINE_RIGHT;
OSD.data.preview[centerishPosition] = SYM.AH_CENTER;
}
// sidebars
if ($('input[name="HORIZON_SIDEBARS"]').prop('checked')) {
var hudwidth = OSD.constants.AHISIDEBARWIDTHPOSITION;
var hudheight = OSD.constants.AHISIDEBARHEIGHTPOSITION;
for (var i = -hudheight; i <= hudheight; i++) {
OSD.data.preview[centerishPosition - hudwidth + (i * FONT.constants.SIZES.LINE)] = SYM.AH_DECORATION;
OSD.data.preview[centerishPosition + hudwidth + (i * FONT.constants.SIZES.LINE)] = SYM.AH_DECORATION;
}
// AH level indicators
OSD.data.preview[centerishPosition-hudwidth+1] = SYM.AH_LEFT;
OSD.data.preview[centerishPosition+hudwidth-1] = SYM.AH_RIGHT;
// Required for NW.js - Otherwise the <img /> will
//consume drag/drop events.
field.preview_img.style.pointerEvents = 'none';
}
// render
var $preview = $('.display-layout .preview').empty();
var $row = $('<div class="row"/>');