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@@ -0,0 +1,69 @@
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+/**
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+ * @license Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
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+ * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
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+ */
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+
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+/**
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+ * @module core/indent/indentui
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+ */
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+import ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';
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+
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+import Plugin from '../plugin';
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+
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+/**
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+ * The indent feature.
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+ *
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+ * This plugin registers the `'indent'` and `'outdent'` buttons.
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+ *
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+ * **Note**: In order the commands to work at least one of compatible features is required. Read more in
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+ * {@link module:core/indent/indent~Indent indent feature} api docs.
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+ *
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+ * @extends module:core/plugin~Plugin
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+ */
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+export default class IndentUI extends Plugin {
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+ /**
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+ * @inheritDoc
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+ */
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+ static get pluginName() {
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+ return 'IndentUI';
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+ }
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+
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+ /**
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+ * @inheritDoc
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+ */
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+ init() {
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+ const editor = this.editor;
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+ const t = editor.t;
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+
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+ this._defineButton( 'indent', t( 'Increase indent' ) );
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+ this._defineButton( 'outdent', t( 'Decrease indent' ) );
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+ }
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+
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+ /**
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+ * Defines an UI button.
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+ *
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+ * @param {String} commandName
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+ * @param {String} label
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+ * @private
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+ */
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+ _defineButton( commandName, label ) {
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+ const editor = this.editor;
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+
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+ editor.ui.componentFactory.add( commandName, locale => {
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+ const command = editor.commands.get( commandName );
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+ const view = new ButtonView( locale );
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+
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+ view.set( {
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+ label,
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+ withText: true,
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+ tooltip: true
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+ } );
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+
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+ view.bind( 'isOn', 'isEnabled' ).to( command, 'value', 'isEnabled' );
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+
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+ this.listenTo( view, 'execute', () => editor.execute( commandName ) );
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+
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+ return view;
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+ } );
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+ }
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+}
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