Acquired Opera AdBlock code

files/button.js

Index: files/button.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/files/button.js
@@ -0,0 +1,50 @@
+const button = {
+	update: function(url) {
+		var url = opera.extension.tabs.getSelected().url;
+		if(url) {
+			if(whitelist.check(url))
+				buttonElement.icon = '/images/icon18.png';
+			else
+				buttonElement.icon = '/images/icon_green18.png';
+		}
+		else
+			buttonElement.icon = '/images/icon_yellow18.png';
+	},
+	click: function() {
+		this.update();
+	},
+	enable: function() {
+		preferences.bool('button', true);
+		this.display();
+	},
+	disable: function() {
+		preferences.bool('button', false);
+		opera.contexts.toolbar.removeItem(buttonElement);
+		
+		opera.extension.windows.removeEventListener('focus', button.update, false);
+		opera.extension.tabs.removeEventListener('focus', button.update, false);
+		window.clearInterval(button.update, 1000);
+	},
+	status: function() {
+		return preferences.bool('button');
+	},
+	display: function() {
+		if(this.status()) {
+			this.update();
+			opera.contexts.toolbar.addItem(buttonElement);
+			
+			opera.extension.windows.addEventListener('focus', button.update, false);
+			opera.extension.tabs.addEventListener('focus', button.update, false);
+			window.setInterval(button.update, 1000);
+		}
+	}
+};
+var properties = {
+	disabled: true,
+	icon: '/images/icon18.png',
+	title: translate.get('ext_name')
+};
+var buttonElement = opera.contexts.toolbar.createItem(properties);
+buttonElement.addEventListener('click', button.click(), false);
+
+button.display();