vault backup: 2023-11-14 15:21:35

!Załączniki/Excalidraw/Scripts/Downloaded/Hardware Eraser Support.md

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+/*
+Adds support for pen inversion, a.k.a. the hardware eraser on the back of your pen.
+
+Simply use the eraser on a supported pen, and it will erase. Your previous tool will be restored when the eraser leaves the screen.
+(Tested with a surface pen, but should work with all windows ink devices, and probably others)
+
+**Note:** This script will stay active until the *Obsidian* window is closed.
+
+Compatible with my *Auto Draw for Pen* script
+
+```javascript
+*/
+
+(function() {
+    'use strict';
+
+    let activated
+    let revert
+    
+    function handlePointer(e) {
+        const activeTool = ea.getExcalidrawAPI().getAppState().activeTool;
+        const isEraser = e.pointerType === 'pen' && e.buttons & 32
+        function setActiveTool(t) {
+            ea.getExcalidrawAPI().setActiveTool(t)
+        }
+        if (!activated && isEraser) {
+            //Store previous tool
+            const btns = document.querySelectorAll('.App-toolbar input.ToolIcon_type_radio')
+            for (const i in btns) {
+                if (btns[i]?.checked) {
+                    revert = btns[i]
+                }
+            }
+            revert = activeTool
+
+            // Activate eraser tool
+            setActiveTool({type: "eraser"})
+            activated = true
+
+            // Force Excalidraw to recognize this the same as pen tip
+            // https://github.com/excalidraw/excalidraw/blob/4a9fac2d1e5c4fac334201ef53c6f5d2b5f6f9f5/src/components/App.tsx#L2945-L2951
+            Object.defineProperty(e, 'button', {
+                value: 0,
+                writable: false
+            });
+        }
+        // Keep on eraser!
+        if (isEraser && activated) {
+            setActiveTool({type: "eraser"})
+        }
+        if (activated && !isEraser) {
+            // Revert tool on release
+            // revert.click()
+            setActiveTool(revert)
+            activated = false
+            
+            // Force delete "limbo" elements
+            // This doesn't happen on the web app
+            // It's a bug caused by switching to eraser during a stroke
+            ea.setView("active");
+            var del = []
+            for (const i in ea.getViewElements()) {
+                const element = ea.getViewElements()[i];
+                if (element.opacity === 20) {
+                    del.push(element)
+                }
+            }
+            ea.deleteViewElements(del)
+            setActiveTool(revert)
+        }
+    }
+    
+    window.addEventListener('pointerdown', handlePointer, { capture: true })
+    window.addEventListener('pointermove', handlePointer, { capture: true })
+})();