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- import IconView from '@ckeditor/ckeditor5-ui/src/icon/iconview';
- import dragHandlerIcon from '../theme/icons/drag-handler.svg';
- const HEIGHT_ATTRIBUTE_NAME = 'height';
- /**
- * Returns coordinates of top-left corner of a element, relative to the document's top-left corner.
- *
- * @param {HTMLElement} element
- * @returns {Object} return
- * @returns {Number} return.x
- * @returns {Number} return.y
- */
- function getAbsolutePosition( element ) {
- const nativeRectangle = element.getBoundingClientRect();
- return {
- x: nativeRectangle.left + element.ownerDocument.defaultView.scrollX,
- y: nativeRectangle.top + element.ownerDocument.defaultView.scrollY
- };
- }
- export default class ResizeContext {
- constructor() {
- // HTMLElement???
- this.resizeHost = null;
- // view/UiElement
- this.resizeWrapperElement = null;
- // view/Element
- this.widgetWrapperElement = null;
- // HTMLElement|null - might be uninitialized
- this.domResizeWrapper = null;
- this.domResizeShadow = null;
- // @todo: ---- options below seems like a little outside of a scope of a single context ----
- // Size before resizing.
- this.initialSize = {
- x: 0,
- y: 0
- };
- // Position of a clicked resize handler in x and y axes.
- this.direction = {
- y: 'top',
- x: 'left'
- };
- // Reference point of resizer where the dragging started. It is used to measure the distance to user cursor
- // traveled, thus how much the image should be enlarged.
- // This information is only known after DOM was rendered, so it will be updated later.
- this.referenceCoordinates = {
- y: 0,
- x: 0
- };
- }
- /**
- *
- * @param {module:engine/view/element~Element} widgetElement Widget's wrapper.
- * @param {module:engine/view/downcastwriter~DowncastWriter} writer
- */
- attach( widgetElement, writer ) {
- const that = this;
- this.widgetWrapperElement = widgetElement;
- this.resizeWrapperElement = writer.createUIElement( 'div', {
- class: 'ck ck-widget__resizer-wrapper'
- }, function( domDocument ) {
- const domElement = this.toDomElement( domDocument );
- that.domResizeShadow = that._appendShadowElement( domDocument, domElement );
- that._appendResizers( domElement );
- that.domResizeWrapper = domElement;
- return domElement;
- } );
- // Append resizer wrapper to the widget's wrapper.
- writer.insert( writer.createPositionAt( widgetElement, widgetElement.childCount ), this.resizeWrapperElement );
- writer.addClass( [ 'ck-widget_with-resizer' ], widgetElement );
- }
- /**
- *
- * @param {HTMLElement} domResizeHandler Handler used to calculate reference point.
- */
- begin( domResizeHandler ) {
- this.domResizeShadow.classList.add( 'ck-widget__resizer-shadow-active' );
- this.referenceCoordinates = getAbsolutePosition( domResizeHandler );
- }
- commit( editor ) {
- const modelEntry = this._getModel( editor, this.widgetWrapperElement );
- const newHeight = this.domResizeShadow.clientHeight;
- this._dismissShadow();
- editor.model.change( writer => {
- writer.setAttribute( HEIGHT_ATTRIBUTE_NAME, newHeight, modelEntry );
- } );
- }
- cancel() {
- this._dismissShadow();
- }
- destroy() {
- this.cancel();
- this.domResizeShadow = null;
- this.wrapper = null;
- }
- updateSize( domEventData ) {
- const currentCoordinates = this._extractCoordinates( domEventData );
- const yDistance = this.referenceCoordinates.y - currentCoordinates.y;
- // For top, left handler:
- // yDistance > 0 - element is enlarged
- // yDistance < 0 - element is shrinked
- if ( yDistance > 0 ) {
- // console.log( 'enlarging' );
- this.domResizeShadow.style.top = ( yDistance * -1 ) + 'px';
- } else {
- // console.log( 'shrinking' );
- this.domResizeShadow.style.top = ( yDistance * -1 ) + 'px';
- }
- }
- redraw() {
- if ( this.domResizeWrapper ) {
- const resizingHost = this.domResizeWrapper.parentElement.querySelector( 'img' );
- this.domResizeWrapper.style.left = resizingHost.offsetLeft + 'px';
- this.domResizeWrapper.style.right = resizingHost.offsetLeft + 'px';
- }
- }
- _appendShadowElement( domDocument, domElement ) {
- const shadowElement = domDocument.createElement( 'div' );
- shadowElement.setAttribute( 'class', 'ck ck-widget__resizer-shadow' );
- domElement.appendChild( shadowElement );
- return shadowElement;
- }
- _appendResizers( domElement ) {
- const resizerPositions = [ 'top-left', 'top-right', 'bottom-right', 'bottom-left' ];
- for ( const currentPosition of resizerPositions ) {
- // Use the IconView from the UI library.
- const icon = new IconView();
- icon.set( 'content', dragHandlerIcon );
- icon.extendTemplate( {
- attributes: {
- 'class': `ck-widget__resizer ck-widget__resizer-${ currentPosition }`
- }
- } );
- // Make sure icon#element is rendered before passing to appendChild().
- icon.render();
- domElement.appendChild( icon.element );
- }
- }
- _dismissShadow() {
- this.domResizeShadow.classList.remove( 'ck-widget__resizer-shadow-active' );
- this.domResizeShadow.removeAttribute( 'style' );
- }
- /**
- *
- * @param {module:@ckeditor/ckeditor5-core/src/editor/editor~Editor} editor
- * @param {module:@ckeditor/ckeditor5-engine/src/view/element~Element} widgetWrapperElement
- * @returns {module:@ckeditor/ckeditor5-engine/src/model/element~Element|undefined}
- */
- _getModel( editor, widgetWrapperElement ) {
- return editor.editing.mapper.toModelElement( widgetWrapperElement );
- }
- _extractCoordinates( event ) {
- return {
- x: event.domEvent.pageX,
- y: event.domEvent.pageY
- };
- }
- }
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