@maxgraph/core
Version:
maxGraph is a fully client side JavaScript diagramming library that uses SVG and HTML for rendering.
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JavaScript
/*
Copyright 2021-present The maxGraph project Contributors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
import CellOverlay from '../cell/CellOverlay.js';
import EventObject from '../event/EventObject.js';
import InternalEvent from '../event/InternalEvent.js';
// @ts-expect-error The properties of PartialGraph are defined elsewhere.
export const OverlaysMixin = {
addCellOverlay(cell, overlay) {
cell.overlays.push(overlay);
// Immediately update the cell display if the state exists
const state = this.getView().getState(cell);
if (state) {
this.getCellRenderer().redraw(state);
}
this.fireEvent(new EventObject(InternalEvent.ADD_OVERLAY, { cell, overlay }));
return overlay;
},
getCellOverlays(cell) {
return cell.overlays;
},
removeCellOverlay(cell, overlay = null) {
if (!overlay) {
this.removeCellOverlays(cell);
}
else {
const index = cell.overlays.indexOf(overlay);
if (index >= 0) {
cell.overlays.splice(index, 1);
// Immediately updates the cell display if the state exists
const state = this.getView().getState(cell);
if (state) {
this.getCellRenderer().redraw(state);
}
this.fireEvent(new EventObject(InternalEvent.REMOVE_OVERLAY, { cell, overlay }));
}
else {
overlay = null;
}
}
return overlay;
},
removeCellOverlays(cell) {
const { overlays } = cell;
cell.overlays = [];
// Immediately updates the cell display if the state exists
const state = this.getView().getState(cell);
if (state) {
this.getCellRenderer().redraw(state);
}
for (let i = 0; i < overlays.length; i += 1) {
this.fireEvent(new EventObject(InternalEvent.REMOVE_OVERLAY, 'cell', cell, 'overlay', overlays[i]));
}
return overlays;
},
clearCellOverlays(cell = null) {
cell = cell ?? this.getDataModel().getRoot();
if (!cell)
return;
this.removeCellOverlays(cell);
// Recursively removes all overlays from the children
const childCount = cell.getChildCount();
for (let i = 0; i < childCount; i += 1) {
const child = cell.getChildAt(i);
this.clearCellOverlays(child); // recurse
}
},
setCellWarning(cell, warning = null, img, isSelect = false) {
img = img ?? this.getWarningImage();
if (warning && warning.length > 0) {
// Creates the overlay with the image and warning
const overlay = new CellOverlay(img, `<font color=red>${warning}</font>`);
// Adds a handler for single mouseclicks to select the cell
if (isSelect) {
overlay.addListener(InternalEvent.CLICK, (sender, evt) => {
if (this.isEnabled()) {
this.setSelectionCell(cell);
}
});
}
// Sets and returns the overlay in the graph
return this.addCellOverlay(cell, overlay);
}
this.removeCellOverlays(cell);
return null;
},
};