allow templates to be moved via cursor + alt (related #28)

packages/client/src/components/Template.tsx

@@ -2,10 +2,12 @@ import { useEffect, useRef } from "react";
 import { Template as TemplateCl } from "../lib/template";
 import { useAppContext } from "../contexts/AppContext";
 import { useTemplateContext } from "../contexts/TemplateContext";
+import { Canvas } from "../lib/canvas";
 
 export const Template = () => {
   const { config } = useAppContext();
-  const { enable, url, width, setWidth, x, y, opacity } = useTemplateContext();
+  const { enable, url, width, setWidth, x, y, opacity, setX, setY } =
+    useTemplateContext();
   const templateHolder = useRef<HTMLDivElement>(null);
   const instance = useRef<TemplateCl>();
 
@@ -15,15 +17,71 @@ export const Template = () => {
       return;
     }
 
+    const templateHolderRef = templateHolder.current;
+
     instance.current = new TemplateCl(config!, templateHolder.current);
 
     instance.current.on("autoDetectWidth", (width) => {
-      console.log("autodetectwidth", width);
       setWidth(width);
     });
 
+    let startLocation: { clientX: number; clientY: number } | undefined;
+    let offset: [x: number, y: number] = [0, 0];
+
+    const handleMouseDown = (e: MouseEvent) => {
+      if (!e.altKey) return;
+
+      startLocation = { clientX: e.clientX, clientY: e.clientY };
+      offset = [e.offsetX, e.offsetY];
+      Canvas.instance?.getPanZoom().panning.setEnabled(false);
+    };
+
+    const handleMouseMove = (e: MouseEvent) => {
+      if (!startLocation) return;
+      if (!Canvas.instance) {
+        console.warn(
+          "[Template#handleMouseMove] Canvas.instance is not defined"
+        );
+        return;
+      }
+
+      const deltaX = e.clientX - startLocation.clientX;
+      const deltaY = e.clientY - startLocation.clientY;
+      const newX = startLocation.clientX + deltaX;
+      const newY = startLocation.clientY + deltaY;
+
+      const [canvasX, canvasY] = Canvas.instance.screenToPos(newX, newY);
+
+      templateHolderRef.style.setProperty("left", canvasX - offset[0] + "px");
+      templateHolderRef.style.setProperty("top", canvasY - offset[1] + "px");
+    };
+
+    const handleMouseUp = (e: MouseEvent) => {
+      startLocation = undefined;
+      Canvas.instance?.getPanZoom().panning.setEnabled(true);
+
+      const x = parseInt(
+        templateHolderRef.style.getPropertyValue("left").replace("px", "") ||
+          "0"
+      );
+      const y = parseInt(
+        templateHolderRef.style.getPropertyValue("top").replace("px", "") || "0"
+      );
+
+      setX(x);
+      setY(y);
+    };
+
+    templateHolder.current.addEventListener("mousedown", handleMouseDown);
+    document.addEventListener("mousemove", handleMouseMove);
+    document.addEventListener("mouseup", handleMouseUp);
+
     return () => {
       instance.current?.destroy();
+
+      templateHolderRef?.removeEventListener("mousedown", handleMouseDown);
+      document.removeEventListener("mousemove", handleMouseMove);
+      document.removeEventListener("mouseup", handleMouseUp);
     };
   }, []);
 

packages/client/src/lib/canvas.ts

@@ -95,6 +95,10 @@ export class Canvas extends EventEmitter<CanvasEvents> {
     return this.config;
   }
 
+  getPanZoom() {
+    return this.PanZoom;
+  }
+
   /**
    * Get nearby pixels
    * @param x
@@ -325,6 +329,12 @@ export class Canvas extends EventEmitter<CanvasEvents> {
     document.body.appendChild(el);
   }
 
+  /**
+   * Screen (clientX, clientY) to Canvas position
+   * @param x
+   * @param y
+   * @returns
+   */
   screenToPos(x: number, y: number) {
     // the rendered dimentions in the browser
     const rect = this.canvas.getBoundingClientRect();

packages/client/src/lib/keybinds.ts

@@ -25,6 +25,12 @@ const KEYBINDS = enforceObjectType({
     },
     { key: "LONG_PRESS" },
   ],
+  TEMPLATE_MOVE: [
+    {
+      key: "LCLICK",
+      alt: true,
+    },
+  ],
 });
 
 class KeybindManager_ extends EventEmitter<{
@@ -34,6 +40,9 @@ class KeybindManager_ extends EventEmitter<{
     super();
     // setup listeners
 
+    document.addEventListener("keydown", this.handleKeydown, {
+      passive: false,
+    });
     document.addEventListener("keyup", this.handleKeyup);
     document.addEventListener("click", this.handleClick);
   }
@@ -43,6 +52,20 @@ class KeybindManager_ extends EventEmitter<{
     // this is global and doesn't depend on any elements, so this shouldn't need to be called
   }
 
+  handleKeydown = (e: KeyboardEvent) => {
+    const blacklistedElements = ["INPUT"];
+
+    if (e.target instanceof HTMLElement) {
+      if (blacklistedElements.indexOf(e.target.tagName) > -1) {
+        return;
+      }
+    }
+
+    if (e.key === "Alt") e.preventDefault();
+    if (e.key === "Control") e.preventDefault();
+    if (e.key === "Shift") e.preventDefault();
+  };
+
   handleKeyup = (e: KeyboardEvent) => {
     // discard if in an input element
 

packages/lib/src/renderer/PanZoom.ts

@@ -343,7 +343,7 @@ export class PanZoom extends EventEmitter<PanZoomEvents> {
    * @param e
    */
   private _touch_touchmove = (event: TouchEvent) => {
-    if (this.panning.enabled && event.touches.length === 1) {
+    if (this.panning.active && event.touches.length === 1) {
       event.preventDefault();
       event.stopPropagation();
 
@@ -362,7 +362,7 @@ export class PanZoom extends EventEmitter<PanZoomEvents> {
    * @param e
    */
   private _touch_touchend = (event: TouchEvent) => {
-    if (this.touch.lastTouch && this.panning.enabled) {
+    if (this.touch.lastTouch && this.panning.active) {
       const touch = event.changedTouches[0];
       const dx = Math.abs(this.panning.x - touch.clientX);
       const dy = Math.abs(this.panning.y - touch.clientY);
@@ -372,8 +372,8 @@ export class PanZoom extends EventEmitter<PanZoomEvents> {
       }
     }
 
-    if (this.panning.enabled) {
-      this.panning.enabled = false;
+    if (this.panning.active) {
+      this.panning.active = false;
 
       const touch = event.changedTouches[0];
 
@@ -391,7 +391,7 @@ export class PanZoom extends EventEmitter<PanZoomEvents> {
     this.touch.pinchStartDistance = distance;
     this.touch.lastDistance = distance;
     this.touch.pinchStartScale = this.transform.scale;
-    this.panning.enabled = false;
+    this.panning.active = false;
   }
 
   onPinch(event: TouchEvent) {
@@ -560,7 +560,9 @@ export class PanZoom extends EventEmitter<PanZoomEvents> {
 
     this.mouse.mouseDown = Date.now();
 
-    this.panning.start(e.clientX, e.clientY);
+    if (this.panning.enabled) {
+      this.panning.start(e.clientX, e.clientY);
+    }
   };
 
   /**
@@ -570,19 +572,7 @@ export class PanZoom extends EventEmitter<PanZoomEvents> {
    * @param e
    */
   private _mouse_mousemove = (e: MouseEvent) => {
-    if (this.panning.enabled) {
-      e.preventDefault();
-      e.stopPropagation();
-
-      this.panning.move(e.clientX, e.clientY);
-    } else {
-      // not panning
-      this.emit("hover", {
-        clientX: e.clientX,
-        clientY: e.clientY,
-      });
-    }
-    if (this.panning.enabled) {
+    if (this.panning.active) {
       e.preventDefault();
       e.stopPropagation();
 
@@ -629,7 +619,7 @@ export class PanZoom extends EventEmitter<PanZoomEvents> {
       }
     }
 
-    if (this.panning.enabled) {
+    if (this.panning.active) {
       // currently panning
       e.preventDefault();
       e.stopPropagation();

packages/lib/src/renderer/lib/panning.utils.ts

@@ -3,7 +3,8 @@ import { PanZoom } from "../PanZoom";
 export class Panning {
   private instance: PanZoom;
 
-  public enabled: boolean = false;
+  public active: boolean = false;
+  public enabled: boolean = true;
   public x: number = 0;
   public y: number = 0;
 
@@ -11,13 +12,20 @@ export class Panning {
     this.instance = instance;
   }
 
+  public setEnabled(enabled: boolean) {
+    this.enabled = enabled;
+
+    this.active = false;
+    this.instance.update();
+  }
+
   /**
    * trigger panning start
    * @param x clientX
    * @param y clientY
    */
   public start(x: number, y: number) {
-    this.enabled = true;
+    this.active = true;
     this.x = x;
     this.y = y;
   }
@@ -45,7 +53,7 @@ export class Panning {
    * @param y clientY
    */
   public end(x: number, y: number) {
-    this.enabled = false;
+    this.active = false;
 
     const deltaX = (x - this.x) / this.instance.transform.scale;
     const deltaY = (y - this.y) / this.instance.transform.scale;