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* VisualEditor ContentEditable DragDropHandler class.
*
* @copyright See AUTHORS.txt
*/
/**
* Drag and drop handler
*
* @param {ve.ce.Surface} surface
*/
ve.ce.DragDropHandler = function VeCeDragDropHandler( surface ) {
this.surface = surface;
this.$dropMarker = $( '<div>' ).addClass( 've-ce-surface-dropMarker oo-ui-element-hidden' );
this.$lastDropTarget = null;
this.lastDropPosition = null;
this.relocatingSelection = null;
this.relocatingNode = null;
this.allowedFile = null;
this.getSurface().$element.on( {
dragstart: this.onDocumentDragStart.bind( this ),
dragover: this.onDocumentDragOver.bind( this ),
dragleave: this.onDocumentDragLeave.bind( this ),
drop: this.onDocumentDrop.bind( this )
} );
};
/* Methods */
/**
* Get the handled surface
*
* @return {ve.ce.Surface}
*/
ve.ce.DragDropHandler.prototype.getSurface = function () {
return this.surface;
};
/**
* Handle document drag start events.
*
* @param {jQuery.Event} e Drag start event
* @fires ve.ce.Surface#relocationStart
*/
ve.ce.DragDropHandler.prototype.onDocumentDragStart = function ( e ) {
this.getSurface().getClipboardHandler().onCopy( e );
this.startRelocation();
};
/**
* Handle document drag over events.
*
* @param {jQuery.Event} e Drag over event
*/
ve.ce.DragDropHandler.prototype.onDocumentDragOver = function ( e ) {
const dataTransferHandlerFactory = this.getSurface().getSurface().dataTransferHandlerFactory,
dataTransfer = e.originalEvent.dataTransfer;
let isContent = true;
if ( this.getSurface().isReadOnly() ) {
return;
}
let nodeType;
if ( this.relocatingNode ) {
isContent = this.relocatingNode.isContent();
nodeType = this.relocatingNode.getType();
} else {
if ( this.allowedFile === null ) {
this.allowedFile = false;
// If we can get file metadata, check if there is a DataTransferHandler registered
// to handle it.
if ( dataTransfer.items ) {
for ( let i = 0, l = dataTransfer.items.length; i < l; i++ ) {
const item = dataTransfer.items[ i ];
if ( item.kind !== 'string' ) {
const fakeItem = new ve.ui.DataTransferItem( item.kind, item.type );
if ( dataTransferHandlerFactory.getHandlerNameForItem( fakeItem ) ) {
this.allowedFile = true;
break;
}
}
}
} else if ( dataTransfer.files && dataTransfer.files.length ) {
for ( let i = 0, l = dataTransfer.files.length; i < l; i++ ) {
const item = dataTransfer.items[ i ];
const fakeItem = new ve.ui.DataTransferItem( item.kind, item.type );
if ( dataTransferHandlerFactory.getHandlerNameForItem( fakeItem ) ) {
this.allowedFile = true;
break;
}
}
} else if ( Array.prototype.indexOf.call( dataTransfer.types || [], 'Files' ) !== -1 ) {
// Support: Firefox
// If we have no metadata (e.g. in Firefox) assume it is droppable
this.allowedFile = true;
}
}
// this.allowedFile is cached until the next dragleave event
if ( this.allowedFile ) {
isContent = false;
nodeType = 'alienBlock';
}
}
function getNearestDropTarget( node ) {
while ( node.parent && !node.parent.isAllowedChildNodeType( nodeType ) ) {
node = node.parent;
}
if ( node.parent ) {
node.parent.traverseUpstream( ( n ) => {
if ( n.shouldIgnoreChildren() ) {
node = null;
return false;
}
} );
return node;
}
}
if ( !isContent ) {
e.preventDefault();
const $target = $( e.target ).closest( '.ve-ce-branchNode, .ve-ce-leafNode' );
let $dropTarget;
let dropPosition;
if ( $target.length ) {
// Find the nearest node which will accept this node type
let dropTargetNode = getNearestDropTarget( $target.data( 'view' ) );
if ( dropTargetNode ) {
$dropTarget = dropTargetNode.$element;
dropPosition = e.originalEvent.pageY - $dropTarget.offset().top > $dropTarget.outerHeight() / 2 ? 'bottom' : 'top';
} else {
const targetOffset = this.getSurface().getOffsetFromEventCoords( e.originalEvent );
if ( targetOffset !== -1 ) {
dropTargetNode = getNearestDropTarget( this.getSurface().getDocument().getBranchNodeFromOffset( targetOffset ) );
if ( dropTargetNode ) {
$dropTarget = dropTargetNode.$element;
dropPosition = 'top';
}
}
if ( !$dropTarget ) {
$dropTarget = this.$lastDropTarget;
dropPosition = this.lastDropPosition;
}
}
}
if ( this.$lastDropTarget && (
!this.$lastDropTarget.is( $dropTarget ) || dropPosition !== this.lastDropPosition
) ) {
this.$dropMarker.addClass( 'oo-ui-element-hidden' );
$dropTarget = null;
}
if ( $dropTarget && (
!$dropTarget.is( this.$lastDropTarget ) || dropPosition !== this.lastDropPosition
) ) {
const targetPosition = $dropTarget.position();
// Go beyond margins as they can overlap
let top = targetPosition.top + parseFloat( $dropTarget.css( 'margin-top' ) );
const left = targetPosition.left + parseFloat( $dropTarget.css( 'margin-left' ) );
if ( dropPosition === 'bottom' ) {
top += $dropTarget.outerHeight();
}
this.$dropMarker
.css( {
top: top,
left: left
} )
.width( $dropTarget.outerWidth() )
.removeClass( 'oo-ui-element-hidden' );
}
if ( $dropTarget !== undefined ) {
this.$lastDropTarget = $dropTarget;
this.lastDropPosition = dropPosition;
}
}
};
/**
* Handle document drag leave events.
*
* @param {jQuery.Event} e Drag leave event
*/
ve.ce.DragDropHandler.prototype.onDocumentDragLeave = function () {
this.allowedFile = null;
Iif ( this.$lastDropTarget ) {
this.$dropMarker.addClass( 'oo-ui-element-hidden' );
this.$lastDropTarget = null;
this.lastDropPosition = null;
}
};
/**
* Handle document drop events.
*
* Limits native drag and drop behaviour.
*
* @param {jQuery.Event} e Drop event
* @fires ve.ce.Surface#relocationEnd
*/
ve.ce.DragDropHandler.prototype.onDocumentDrop = function ( e ) {
// Properties may be nullified by other events, so cache before setTimeout
const surfaceModel = this.getSurface().getModel(),
$dropTarget = this.$lastDropTarget,
dropPosition = this.lastDropPosition,
platformKey = ve.getSystemPlatform() === 'mac' ? 'mac' : 'pc';
// Prevent native drop event from modifying view
e.preventDefault();
Iif ( this.getSurface().isReadOnly() ) {
return;
}
let targetOffset;
// Determine drop position
Iif ( $dropTarget ) {
// Block level drag and drop: use the lastDropTarget to get the targetOffset
if ( $dropTarget ) {
const targetRange = $dropTarget.data( 'view' ).getModel().getOuterRange();
if ( dropPosition === 'top' ) {
targetOffset = targetRange.start;
} else {
targetOffset = targetRange.end;
}
} else {
return;
}
} else {
targetOffset = this.getSurface().getOffsetFromEventCoords( e.originalEvent );
if ( targetOffset === -1 ) {
return;
}
}
const targetFragment = surfaceModel.getLinearFragment( new ve.Range( targetOffset ) );
const targetViewNode = this.getSurface().getDocument().getBranchNodeFromOffset(
targetFragment.getSelection().getCoveringRange().from
);
// TODO: Support sanitized drop on a single line node (removing line breaks)
const isMultiline = targetViewNode.isMultiline();
// Internal drop
if ( this.relocatingSelection ) {
// Get a fragment and data of the node being dragged
const originFragment = surfaceModel.getFragment( this.relocatingSelection );
let originData;
Iif ( !isMultiline ) {
// Data needs to be balanced to be sanitized
const slice = this.getSurface().getModel().getDocument().shallowCloneFromRange( originFragment.getSelection().getCoveringRange() );
const linearData = new ve.dm.ElementLinearData(
originFragment.getDocument().getStore(),
slice.getBalancedData()
);
linearData.sanitize( { singleLine: true } );
originData = linearData.data;
// Unwrap CBN
if ( originData[ 0 ].type && ve.dm.nodeFactory.canNodeContainContent( originData[ 0 ].type ) ) {
originData = originData.slice( 1, originData.length - 1 );
}
} else {
originData = originFragment.getData();
}
// Start staging so we can abort in the catch later
surfaceModel.pushStaging();
// Dragging performs cut-and-paste by default (remove content from old location).
// If Ctrl on PC, or Opt (alt) on Mac, is held, it performs copy-and-paste instead.
Eif ( ( platformKey === 'pc' && !e.ctrlKey ) || ( platformKey === 'mac' && !e.altKey ) ) {
originFragment.removeContent();
}
try {
// Re-insert data at new location
targetFragment.insertContent( originData );
surfaceModel.applyStaging();
} catch ( error ) {
// Insert content may throw an exception if it can't find a way
// to fixup the insertion sensibly
surfaceModel.popStaging();
}
} else E{
// External drop
// TODO: Support sanitized external drop into single line contexts
if ( isMultiline ) {
this.getSurface().getClipboardHandler().onPaste( e );
}
}
this.endRelocation();
};
/* Relocation */
/**
* Start a relocation action.
*
* @fires ve.ce.Surface#relocationStart
*/
ve.ce.DragDropHandler.prototype.startRelocation = function () {
// Cache the selection and selectedNode when the drag starts, to
// avoid having to recompute them while dragging.
this.relocatingSelection = this.getSurface().getModel().getSelection();
this.relocatingNode = this.getSurface().getModel().getSelectedNode();
this.getSurface().emit( 'relocationStart' );
};
/**
* Complete a relocation action.
*
* @fires ve.ce.Surface#relocationEnd
*/
ve.ce.DragDropHandler.prototype.endRelocation = function () {
this.relocatingSelection = null;
this.relocatingNode = null;
// Trigger a drag leave event to clear markers
this.onDocumentDragLeave();
this.getSurface().emit( 'relocationEnd' );
};
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