/*

* Copyright (C) 1998-2023 by Northwoods Software Corporation. All Rights Reserved.

*/

/*

* This is an extension and not part of the main GoJS library.

* Note that the API for this class may change with any version, even point releases.

* If you intend to use an extension in production, you should copy the code to your own source directory.

* Extensions can be found in the GoJS kit under the extensions or extensionsJSM folders.

* See the Extensions intro page (https://gojs.net/latest/intro/extensions.html) for more information.

*/

import * as go from '../release/go-module.js';

/**

* The OverviewResizingTool class lets the user resize the box within an overview.

*

* If you want to experiment with this extension, try the <a href="../../extensionsJSM/OverviewResizing.html">Overview Resizing</a> sample.

* @category Tool Extension

*/

export class OverviewResizingTool extends go.ResizingTool {

// Internal property used to keep track of changing handle size

private _handleSize: go.Size;

/**

* Constructs an OverviewResizingTool and sets the name for the tool.

*/

constructor() {

super();

this.name = 'OverviewResizing';

this._handleSize = new go.Size(6, 6);

}

/**

* @hidden @internal

* @param {Shape} resizeBox

* @return {Adornment}

*/

public override makeAdornment(resizeBox: go.Shape): go.Adornment {

this._handleSize.setTo(resizeBox.strokeWidth * 3, resizeBox.strokeWidth * 3);

// Set up the resize adornment

const ad = new go.Adornment();

ad.type = go.Panel.Spot;

ad.locationSpot = go.Spot.Center;

const ph = new go.Placeholder();

ph.isPanelMain = true;

ad.add(ph);

const hnd = new go.Shape();

hnd.name = 'RSZHND';

hnd.figure = 'Rectangle';

hnd.desiredSize = this._handleSize;

hnd.cursor = 'se-resize';

hnd.alignment = go.Spot.BottomRight;

hnd.alignmentFocus = go.Spot.Center;

ad.add(hnd);

ad.adornedObject = resizeBox;

return ad;

}

/**

* @hidden @internal

* Keep the resize handle properly sized as the scale is changing.

* This overrides an undocumented method on the ResizingTool.

* @param {Adornment} elt

* @param {number} angle

*/

public override updateResizeHandles(elt: go.Adornment, angle: number) {

if (elt === null) return;

const handle = elt.findObject('RSZHND') as go.Shape;

const box = elt.adornedObject as go.Shape;

this._handleSize.setTo(box.strokeWidth * 3, box.strokeWidth * 3);

handle.desiredSize = this._handleSize;

}

/**

* Overrides {@link ResizingTool#resize} to resize the overview box via setting the observed diagram's scale.

* @param {Rect} newr the intended new rectangular bounds the overview box.

*/

public override resize(newr: go.Rect): void {

const overview = this.diagram as go.Overview;

const observed = overview.observed;

if (observed === null) return;

const oldr = observed.viewportBounds.copy();

const oldscale = observed.scale;

if (oldr.width !== newr.width || oldr.height !== newr.height) {

if (newr.width > 0 && newr.height > 0) {

observed.scale = Math.min(oldscale * oldr.width / newr.width, oldscale * oldr.height / newr.height);

}

}

}

}