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// ==UserScript==
// @name         噗浪：表符群組增高器
// @namespace    https://www.plurk.com/anonymous
// @version      0.2
// @description  1. 表符選單的群組左箭咀將會化為增高箭咀，輕鬆點擊一覽全部群組
//               2. 表符列表利用箭咀增高減低，輕鬆點擊一覽多個表符
//                  上下箭咀：調整群組高度（顯示3行~7行表符）
//                  CTRL+上下箭咀：自動調整群組表符高度（群組只有5行表符，就顯示5行）
//                  SHIFT+上下箭咀：最大化／最小化群組表符高度（最小官方預設的3行多，最多7行）
// @author       ಠ_ಠ
// @match        https://www.plurk.com/*
// @grant        none
// @run-at      document-idle
// ==/UserScript==

(function() {
    'use strict';

	window.custPlugin = window.custPlugin || {};
	window.custPlugin.emo = window.custPlugin.emo || $();
	window.custPlugin.emo.extend({

		emoHolderRow: 3,

		addEmoHolderExpander: function(){
			var expander = $('#emoHolderExpander');
			if (expander.length){
				return;
			}

			expander = $('<div>', {
				id: "emoHolderExpander",
				css: {
					position : "absolute",
					right: "90px",
					top: "5px",
				}
			});
			var moreRowBtn = $('<div>', {
				text: '▲',
			});
			var lessRowBtn = $('<div>', {
				text: '▼',
			});
			expander.append(moreRowBtn);
			expander.append(lessRowBtn);
			expander.find('> div').css({
				width: '20px',
				height: '16px',
				textAlign: 'center',
				backgroundColor: '#92a0ab',
				color: '#FFF',
				margin: '2px 0',
				borderRadius: '3px',
				cursor: 'pointer',
				userSelect: 'none',
			});

			moreRowBtn.on('click', function(evt){
				if (evt.ctrlKey){
					custPlugin.emo.fixEmoHolderRow();
				}
				else{
					var row = (evt.shiftKey) ? 7 : 1;
					custPlugin.emo.changeEmoHolderRow(row);
				}
			});
			lessRowBtn.on('click', function(evt){
				if (evt.ctrlKey){
					custPlugin.emo.fixEmoHolderRow();
				}
				else{
					var row = (evt.shiftKey) ? -7 : -1;
					custPlugin.emo.changeEmoHolderRow(row);
				}
			});

			expander.find('> div').hover(function(){
				$(this).css('background-color', '#5abfff')
			}, function(){
				$(this).css('background-color', '#92a0ab')
			});


			$('#emoticon-selector-holder .manager-button').after(expander);
		},

		fixEmoHolderRow: function(){
			var needRows = Math.floor(($('#emoticons-holder li').length - 1) / 7 + 1);
			if (this.emoHolderRow == needRows){
				this.emoHolderRow = 3;
			}
			else{
				this.emoHolderRow = needRows;
			}
			this.changeEmoHolderHeight(this.emoHolderRow);
		},

		changeEmoHolderRow: function(i){
			this.emoHolderRow = this.emoHolderRow + i;
			if (this.emoHolderRow > 7){
				this.emoHolderRow = 7;
			}
			else if (this.emoHolderRow < 3){
				this.emoHolderRow = 3;
			}

			this.changeEmoHolderHeight(this.emoHolderRow);
		},

		changeEmoHolderHeight: function(rows){
			if (rows >= 7){
				$('#emoticons-holder').css('height', '384px');
			}
			else if (rows == 6){
				$('#emoticons-holder').css('height', '330px');
			}
			else if (rows == 5){
				$('#emoticons-holder').css('height', '276px');
			}
			else if (rows == 4){
				$('#emoticons-holder').css('height', '222px');
			}
			else{
				$('#emoticons-holder').css('height', '');
			}
		},

		addEmoGroupExpander: function(){
			var leftArrow = $('#emoticon-tabs .tabs-arrow-left');

			if (leftArrow.hasClass('plug-expander')){
				return;
			}
			leftArrow.addClass('plug-expander');

			var emoTabHeight = $('#emoticon-tabs').css('height');
			var emoTabUlWhiteSpace = $('#emoticon-tabs ul').css('white-space');

			leftArrow.hover(function(){
				if ($(this).hasClass("disabled")){
					$(this).removeClass('pif-back');
					$(this).removeClass('disabled');
					$(this).addClass('pif-option');
				}
			}, function(){
				if ($(this).hasClass("pif-option")){
					$(this).removeClass('pif-option');
					$(this).addClass('pif-back');
					$(this).addClass('disabled');
				}
			});

			leftArrow.on('click', function(evt){
				if ($(this).hasClass("pif-option")){
					$(this).removeClass('pif-option');
					$(this).addClass('pif-arrow-up');
					$('#emoticon-tabs').css('height', 'auto');
					$('#emoticon-tabs ul').css('white-space', 'normal');
				}
				else if ($(this).hasClass("pif-arrow-up") && evt.originalEvent !== undefined){
					$(this).removeClass('pif-arrow-up');
					$(this).addClass('pif-option');
					$('#emoticon-tabs').css('height', emoTabHeight);
					$('#emoticon-tabs ul').css('white-space', emoTabUlWhiteSpace);
				}
			});
		},
	});

	new MutationObserver(function (mutations, me) {
		if (document.querySelector('#emoticon-tabs li.current')){
			custPlugin.emo.addEmoGroupExpander();
			custPlugin.emo.addEmoHolderExpander();
			me.disconnect();
		}
	}).observe(document, {childList: true, subtree: true });

})();