I have successfully created a dark theme for snap, sort of. I created it as a userscript. What it does is, add a new item to the settings menu which switches between light and dark theme. Additionally, when you turn on flat design, it isn't automatically light theme, so you can now have a dark flat theme.
Link: https://ego-lay-atman-bay.github.io/snap-extensions/userscripts/snap-editor-theme.user.js
Just add that into tapermonkey, and then you'll get it.
Screenshots
Source
// ==UserScript==
// @name Snap! editor theme
// @namespace https://ego-lay-atman-bay.github.io/snap-extensions/
// @version 0.5
// @description New snap editor theme
// @author ego-lay_atman-bay
// @match https://snap.berkeley.edu/snap/snap.html
// @icon https://forum.snap.berkeley.edu/favicon/proxied?https%3A%2F%2Fd1eo0ig0pi5tcs.cloudfront.net%2Foptimized%2F2X%2Ff%2Ffec08d3829a26a75ae620be49835ef91b13ba8e9_2_32x32.png
// @grant none
// ==/UserScript==
(function () {
'use strict';
console.log('Injecting theme');
MorphicPreferences.isLight = MorphicPreferences.isFlat
function update_settings() {
var settings = IDE_Morph.prototype.applySavedSettings.toString();
var settings_lines = settings.split('\n');
var get_light_mode = " theme = this.getSetting('theme');\n\n if (theme === 'light') {\n this.setLightDesign();\n } else if (theme == 'dark') {\n this.setDarkDesign();\n } else {\n if (design == 'flat') {\n this.setLightDesign();\n } else {\n this.setDarkDesign();\n }\n }";
settings_lines.splice(settings_lines.indexOf(''), 0, get_light_mode);
const settings_func = new Function('IDE_Morph.prototype.applySavedSettings = ' + settings_lines.join('\n'));
settings_func();
IDE_Morph.prototype.applySavedSettings();
}
IDE_Morph.prototype.darkDesign = function () {
this.setDarkDesign();
this.refreshIDE();
this.saveSetting('theme', 'dark');
};
IDE_Morph.prototype.lightDesign = function () {
this.setLightDesign();
this.refreshIDE();
this.saveSetting('theme', 'light');
};
function replace_flat(text) {
return text.replace('MorphicPreferences.isFlat', 'MorphicPreferences.isLight');
}
function set_func(name) {
const getFunc = new Function('return ' + name)
var func = getFunc()
var string = replace_flat(func.toString());
const activate = new Function(name + ' = ' + string);
activate();
}
function inject_design() {
var injection = " if (MorphicPreferences.isLight) {\n this.saveSetting('theme', 'light');\n } else {\n this.saveSetting('theme', 'dark');\n }";
var flatdesign = IDE_Morph.prototype.flatDesign.toString().split('\n');
var defaultdesign = IDE_Morph.prototype.defaultDesign.toString().split('\n');
flatdesign.splice(flatdesign['length']-1, 0, injection);
defaultdesign.splice(defaultdesign['length']-1, 0, injection);
const injected_flat = new Function('IDE_Morph.prototype.flatDesign = ' + flatdesign.join('\n'));
const injected_default = new Function('IDE_Morph.prototype.defaultDesign = ' + defaultdesign.join('\n'));
injected_flat();
injected_default();
}
inject_design();
set_func('IDE_Morph.prototype.createLogo');
set_func('IDE_Morph.prototype.createControlBar');
set_func('IDE_Morph.prototype.createCategories');
set_func('IDE_Morph.prototype.createSpriteBar');
set_func('IDE_Morph.prototype.createCorralBar');
set_func('BlockDialogMorph.prototype.addCategoryButton');
set_func('BlockDialogMorph.prototype.addCustomCategoryButton');
set_func('SpriteMorph.prototype.searchBlocks');
var dark = replace_flat(IDE_Morph.prototype.setDefaultDesign.toString());
var light = replace_flat(IDE_Morph.prototype.setFlatDesign.toString())
dark = dark.split('\n')
dark.splice(-1, 0, "PushButtonMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n ToggleButtonMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n TabMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n ToggleMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n ToggleElementMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;")
dark = dark.join('\n')
light = light.split('\n')
light.splice(-1, 0, " PushButtonMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n ToggleButtonMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n TabMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n ToggleMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n ToggleElementMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;")
light = light.join('\n')
// console.log(dark)
// console.log(light)
const setdark = new Function('IDE_Morph.prototype.setDarkDesign = ' + dark);
const setlight = new Function('IDE_Morph.prototype.setLightDesign = ' + light);
setdark()
setlight()
IDE_Morph.prototype.setFlatDesign = function () {
MorphicPreferences.isFlat = true;
IDE_Morph.prototype.scriptsPaneTexture = null;
};
IDE_Morph.prototype.setDefaultDesign = function () {
MorphicPreferences.isFlat = false;
IDE_Morph.prototype.scriptsPaneTexture = this.scriptsTexture();
};
var menu = IDE_Morph.prototype.settingsMenu.toString();
var split = menu.split("\n addPreference(\n 'Flat design',\n () => {\n if (MorphicPreferences.isFlat) {\n return this.defaultDesign();\n }\n this.flatDesign();\n },\n MorphicPreferences.isFlat,\n 'uncheck for default\\nGUI design',\n 'check for alternative\\nGUI design',\n false\n );");
split.splice(1, 0, " addPreference(\n 'Flat design',\n () => {\n if (MorphicPreferences.isFlat) { return this.defaultDesign();\n }\n this.flatDesign();\n }, MorphicPreferences.isFlat,\n 'uncheck for default\\nGUI design', 'check for alternative\\nGUI design',\n false\n );\n addPreference(\n 'Dark theme',\n () => {\n if (MorphicPreferences.isLight) {\n return this.darkDesign();\n }\n this.lightDesign();\n },\n !MorphicPreferences.isLight,\n 'uncheck for light\\nGUI theme',\n 'check for dark\\nGUI theme',\n false\n );");
var newFun = split.join('');
const dark_mode = new Function('IDE_Morph.prototype.settingsMenu = ' + newFun);
dark_mode();
update_settings();
})();
bookmarklet
javascript:(function(){"use strict";function e(e){return e.replace("MorphicPreferences.isFlat","MorphicPreferences.isLight")}function t(t){var o=e(new Function("return "+t)().toString());new Function(t+" = "+o)()}console.log("Injecting theme"),MorphicPreferences.isLight=MorphicPreferences.isFlat,IDE_Morph.prototype.darkDesign=function(){this.setDarkDesign(),this.refreshIDE(),this.saveSetting("theme","dark")},IDE_Morph.prototype.lightDesign=function(){this.setLightDesign(),this.refreshIDE(),this.saveSetting("theme","light")},function(){var e=" if (MorphicPreferences.isLight) {\n this.saveSetting('theme', 'light');\n } else {\n this.saveSetting('theme', 'dark');\n }",t=IDE_Morph.prototype.flatDesign.toString().split("\n"),o=IDE_Morph.prototype.defaultDesign.toString().split("\n");t.splice(t.length-1,0,e),o.splice(o.length-1,0,e);const r=new Function("IDE_Morph.prototype.flatDesign = "+t.join("\n")),n=new Function("IDE_Morph.prototype.defaultDesign = "+o.join("\n"));r(),n()}(),t("IDE_Morph.prototype.createLogo"),t("IDE_Morph.prototype.createControlBar"),t("IDE_Morph.prototype.createCategories"),t("IDE_Morph.prototype.createSpriteBar"),t("IDE_Morph.prototype.createCorralBar"),t("BlockDialogMorph.prototype.addCategoryButton"),t("BlockDialogMorph.prototype.addCustomCategoryButton"),t("SpriteMorph.prototype.searchBlocks");var o=e(IDE_Morph.prototype.setDefaultDesign.toString()),r=e(IDE_Morph.prototype.setFlatDesign.toString());(o=o.split("\n")).splice(-1,0,"PushButtonMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n ToggleButtonMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n TabMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n ToggleMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n ToggleElementMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;"),o=o.join("\n"),(r=r.split("\n")).splice(-1,0," PushButtonMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n ToggleButtonMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n TabMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n ToggleMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;\n ToggleElementMorph.prototype.outlineColor = IDE_Morph.prototype.frameColor;"),r=r.join("\n");const n=new Function("IDE_Morph.prototype.setDarkDesign = "+o),p=new Function("IDE_Morph.prototype.setLightDesign = "+r);n(),p(),IDE_Morph.prototype.setFlatDesign=function(){MorphicPreferences.isFlat=!0,IDE_Morph.prototype.scriptsPaneTexture=null},IDE_Morph.prototype.setDefaultDesign=function(){MorphicPreferences.isFlat=!1,IDE_Morph.prototype.scriptsPaneTexture=this.scriptsTexture()};var i=IDE_Morph.prototype.settingsMenu.toString().split("\n addPreference(\n 'Flat design',\n () => {\n if (MorphicPreferences.isFlat) {\n return this.defaultDesign();\n }\n this.flatDesign();\n },\n MorphicPreferences.isFlat,\n 'uncheck for default\\nGUI design',\n 'check for alternative\\nGUI design',\n false\n );");i.splice(1,0," addPreference(\n 'Flat design',\n () => {\n if (MorphicPreferences.isFlat) { return this.defaultDesign();\n }\n this.flatDesign();\n }, MorphicPreferences.isFlat,\n 'uncheck for default\\nGUI design', 'check for alternative\\nGUI design',\n false\n );\n\taddPreference(\n 'Dark theme',\n () => {\n if (MorphicPreferences.isLight) {\n return this.darkDesign();\n }\n this.lightDesign();\n },\n !MorphicPreferences.isLight,\n 'uncheck for light\\nGUI theme',\n 'check for dark\\nGUI theme',\n false\n );");var s=i.join("");var h;new Function("IDE_Morph.prototype.settingsMenu = "+s)(),(h=IDE_Morph.prototype.applySavedSettings.toString().split("\n")).splice(h.indexOf(""),0," theme = this.getSetting('theme');\n\n if (theme === 'light') {\n this.setLightDesign();\n } else if (theme == 'dark') {\n this.setDarkDesign();\n } else {\n if (design == 'flat') {\n this.setLightDesign();\n } else {\n this.setDarkDesign();\n }\n }"),new Function("IDE_Morph.prototype.applySavedSettings = "+h.join("\n"))(),IDE_Morph.prototype.applySavedSettings()})();
