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main_plugin/dgrm/diagram/canvas-clear.js

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+import { CanvasSmbl } from '../infrastructure/canvas-smbl.js';
+import { PathSmbl } from '../shapes/path-smbl.js';
+import { ShapeSmbl } from '../shapes/shape-smbl.js';
+
+/** @param {CanvasElement} canvas */
+export function canvasClear(canvas) {
+	while (canvas.firstChild) {
+		(canvas.firstChild[ShapeSmbl] || canvas.firstChild[PathSmbl]).del();
+	}
+	canvas[CanvasSmbl].move(0, 0, 1);
+}
+
+//
+// selection clear function
+
+/** @param {CanvasElement} canvas */
+export function canvasSelectionClear(canvas) {
+	if (canvas[CanvasSmbl].selectClear) { canvas[CanvasSmbl].selectClear(); };
+}
+
+/** @param {CanvasElement} canvas, @param {()=>void} clearFn */
+export function canvasSelectionClearSet(canvas, clearFn) {
+	canvas[CanvasSmbl].selectClear = clearFn;
+}
+
+/** @typedef { import('../infrastructure/move-scale-applay.js').CanvasElement } CanvasElement */