From 9a863676e05f5ddc4dc000818c4bda964a0bce9b Mon Sep 17 00:00:00 2001
From: Robert Rosman <robert.rosman@zmartagroup.com>
Date: Mon, 3 Jun 2024 08:50:09 +0200
Subject: [PATCH] fix: scope the svgStyle to prevent style bleeding

---
 src/components/VpImage.vue                    | 18 +++-
 src/composables/tools/useMove/useMove.ts      | 46 +++++-----
 .../tools/useTextarea/useTextarea.ts          | 87 ++++++++++---------
 src/types.ts                                  |  6 +-
 src/utils/randomId.test.ts                    | 11 ++-
 src/utils/randomId.ts                         |  9 +-
 6 files changed, 103 insertions(+), 74 deletions(-)

diff --git a/src/components/VpImage.vue b/src/components/VpImage.vue
index 9528a14..f3d2870 100644
--- a/src/components/VpImage.vue
+++ b/src/components/VpImage.vue
@@ -2,6 +2,7 @@
 import { computed, ref, toRefs, unref } from 'vue'
 import type { Shape, Tool, ToolType } from '../types'
 import { useSimplifiedHistory } from '@/composables/useSimplifiedHistory';
+import { randomId } from '@/utils/randomId';
 
 const props = defineProps<{
   tools: Tool<any>[]
@@ -12,6 +13,7 @@ const props = defineProps<{
 }>()
 
 const svg = ref()
+const svgId = ref(randomId())
 
 defineExpose({
   svg
@@ -21,7 +23,19 @@ function getTool(toolType: ToolType) {
   return props.tools.find((tool) => tool.type === toolType)
 }
 
-const style = computed(() => props.tools.map((tool) => tool.svgStyle ? unref(tool.svgStyle) : '').join('\n'))
+const style = computed(() => {
+  return props.tools.map((tool) => {
+    if (!tool.svgStyle) {
+      return ''
+    }
+    else if (typeof tool.svgStyle === 'function') {
+      return tool.svgStyle({ svgId: svgId.value })
+    }
+    else {
+      return unref(tool.svgStyle)
+    }
+  }).join('\n')
+})
 
 const { simplifiedHistory } = useSimplifiedHistory({ ...toRefs(props), includeActiveShape: false })
 
@@ -38,7 +52,7 @@ const highLayers = computed(() =>
 </script>
 
 <template>
-  <svg ref="svg" :viewBox="`0 0 ${width} ${height}`" xmlns="http://www.w3.org/2000/svg" class="vp-image">
+  <svg ref="svg" :viewBox="`0 0 ${width} ${height}`" :id="svgId" xmlns="http://www.w3.org/2000/svg" class="vp-image">
 
     <component v-for="tool in lowLayers" :key="tool.type" :is="tool.ToolSvgComponent" :history :tools :activeShape
       :width :height />
diff --git a/src/composables/tools/useMove/useMove.ts b/src/composables/tools/useMove/useMove.ts
index d09340b..23ae33e 100644
--- a/src/composables/tools/useMove/useMove.ts
+++ b/src/composables/tools/useMove/useMove.ts
@@ -1,5 +1,5 @@
 import { useSimplifiedHistory } from '@/composables/useSimplifiedHistory'
-import type { BaseShape, DrawEvent, ExportParameters, ImageHistory, Movement, Shape, Tool, ToolSvgComponentProps } from '@/types'
+import type { BaseShape, DrawEvent, ExportParameters, ImageHistory, Movement, Shape, SvgStyleParameters, Tool, ToolSvgComponentProps } from '@/types'
 import { h, toRefs } from 'vue'
 
 export interface Move extends BaseShape, Movement {
@@ -97,27 +97,29 @@ export function useMove({
     layer: 1_000
   }
 
-  const svgStyle = `
-    circle.handle {
-      r: 0;
-      stroke: #000;
-      stroke-width: 2;
-      stroke-opacity: 0.5;
-      fill: #fff;
-      fill-opacity: 0.3;
-      transition: r 0.1s ease-out;
-    }
-
-    .active-tool-move circle.handle, 
-    .vp-editor circle.handle.is-active {
-      r: ${handleRadius};
-    }
-
-    .active-tool-move circle.handle:hover,
-    .vp-editor circle.handle.is-active:hover {
-      r: ${handleRadius * 1.5};
-    }
-  `
+  function svgStyle ({ svgId }: SvgStyleParameters) {
+    return `
+      circle.handle {
+        r: 0;
+        stroke: #000;
+        stroke-width: 2;
+        stroke-opacity: 0.5;
+        fill: #fff;
+        fill-opacity: 0.3;
+        transition: r 0.1s ease-out;
+      }
+
+      .active-tool-move #${svgId} circle.handle, 
+      .vp-editor #${svgId} circle.handle.is-active {
+        r: ${handleRadius};
+      }
+
+      .active-tool-move #${svgId} circle.handle:hover,
+      .vp-editor #${svgId} circle.handle.is-active:hover {
+        r: ${handleRadius * 1.5};
+      }
+    `
+  }
 
   function beforeExport({ svg }: ExportParameters) {
     svg.querySelectorAll('circle.handle').forEach(handle => handle.remove())
diff --git a/src/composables/tools/useTextarea/useTextarea.ts b/src/composables/tools/useTextarea/useTextarea.ts
index c966d67..12bcaab 100644
--- a/src/composables/tools/useTextarea/useTextarea.ts
+++ b/src/composables/tools/useTextarea/useTextarea.ts
@@ -1,5 +1,5 @@
 import { createDataUrl, urlToBlob } from '@/main'
-import type { BaseShape, DrawEvent, ExportParameters, Movement, Tool } from '@/types'
+import type { BaseShape, DrawEvent, ExportParameters, Movement, SvgStyleParameters, Tool } from '@/types'
 import { rectangleHandles } from '@/composables/tools/useMove/handles/rectangleHandles'
 import { createShapeSvgComponent } from '@/utils/createShapeSvgComponent'
 import { computed, h, ref } from 'vue'
@@ -118,56 +118,57 @@ export function useTextarea({
     }))
   )
 
-  const svgStyle = computed(() => 
-    (customFont.value
-      ? `
-        @font-face {
-          font-family: "${font}";
-          font-style: normal;
-          font-weight: 400;
-          font-display: swap;
-          src: url(${customFont.value}) format("woff2");
-          unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
-        }
-      `
-      : ''
-    )
-
-    + `
-    .vp-image {
-      font-size: ${baseFontSize}px;
-      user-select: none;
-    }
+  function svgStyle ({ svgId }: SvgStyleParameters) {
+    return (customFont.value
+        ? `
+          @font-face {
+            font-family: "${font}";
+            font-style: normal;
+            font-weight: 400;
+            font-display: swap;
+            src: url(${customFont.value}) format("woff2");
+            unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
+          }
+        `
+        : ''
+      )
+
+      + `
+      #${svgId} {
+        font-size: ${baseFontSize}px;
+        user-select: none;
+      }
 
-    .textarea {
-      width: 100%;
-      height: 100%;
-      border: none;
-      outline: none;
-      background: transparent;
-      resize: none;
-      touch-action: none;
-      overflow: hidden;
-      font-family: "${font}", Arial, sans-serif;
-      padding: 1px;
-      cursor: inherit;
-    }
+      #${svgId} .textarea {
+        width: 100%;
+        height: 100%;
+        border: none;
+        outline: none;
+        background: transparent;
+        resize: none;
+        touch-action: none;
+        overflow: hidden;
+        font-family: "${font}", Arial, sans-serif;
+        padding: 1px;
+        cursor: inherit;
+      }
 
-    .textarea.is-active {
-      cursor: text;
-    }
+      #${svgId} .textarea.is-active {
+        cursor: text;
+      }
 
-    .textarea.is-active, .active-tool-move .textarea {
-      border: 1px dashed #777;
-      padding: 0;
-    }
-  `)
+      #${svgId} .textarea.is-active, .active-tool-move #${svgId} .textarea {
+        border: 1px dashed #777;
+        padding: 0;
+      }
+    `
+  }
 
   function beforeExport({ svg, history }: ExportParameters) {
     // Remove styles if no textarea shape exist, to shrink image size
     const styleElement = svg.querySelector('style')
     if (!history.some(shape => shape.type === 'textarea') && styleElement) {
-      styleElement.innerHTML = styleElement.innerHTML.replace(svgStyle.value, '')
+      styleElement.innerHTML = styleElement.innerHTML.replace(svgStyle({ svgId: svg.id }), '')
     }
   }
 
diff --git a/src/types.ts b/src/types.ts
index 0eef239..2072fb7 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -36,6 +36,10 @@ export interface ToolSvgComponentProps extends SvgComponentProps {
   activeShape?: Shape
 }
 
+export interface SvgStyleParameters {
+  svgId: string
+}
+
 /** Every new shape must extend this base class. */
 export interface BaseShape {
   /** What type of shape is produced? Must be unique between tools. */
@@ -102,7 +106,7 @@ export interface Tool<T extends BaseShape> {
    * Here you can add styling that can apply to your svg element. Please scope it in classes, like `.your-tool { opacity: 0.5 }` so
    * it doesn't affect other elements in the same svg.
    */
-  svgStyle?: MaybeRef<string>
+  svgStyle?: MaybeRef<string> | ((args: SvgStyleParameters) => string)
 
   /**
    * This is pretty much the same concept as shapeSvg, except it is only rendered once per image. For some tools it might be sufficient
diff --git a/src/utils/randomId.test.ts b/src/utils/randomId.test.ts
index 9d73a2d..20d56d8 100644
--- a/src/utils/randomId.test.ts
+++ b/src/utils/randomId.test.ts
@@ -8,8 +8,13 @@ describe('randomId', () => {
         expect(typeof id).toBe('string')
     })
 
-    it('should return a 7 letter string padded with zeros', () => {
-        const id = randomId(100)
-        expect(id).toBe('000002s')
+    it('should return the lowest possible id (beginning with a letter)', () => {
+        const id = randomId(() => 0)
+        expect(id).toBe('a000000')
+    })
+
+    it('should return the lowest possible id (beginning with a letter)', () => {
+        const id = randomId(() => 0.9999999999)
+        expect(id).toBe('zzzzzzz')
     })
 })
\ No newline at end of file
diff --git a/src/utils/randomId.ts b/src/utils/randomId.ts
index bdc57c9..deff36a 100644
--- a/src/utils/randomId.ts
+++ b/src/utils/randomId.ts
@@ -1,4 +1,7 @@
-/** Simple function to generate a random id. It is "unique" in the sense "the chance for collision is small enough", but not universally unique. */
-export function randomId(seed: number = Math.random() * 36 * 36 * 36 * 36 * 36 * 36 * 36) {
-    return Math.round(seed).toString(36).padStart(7, '0')
+/** 
+ * Simple function to generate a random id. It is "unique" in the sense "the chance for collision is small enough", but not universally unique.
+ * The generated id will start with a letter in order to be a valid css selector.
+ */
+export function randomId(random = Math.random) {
+    return [26, 36, 36, 36, 36, 36, 36].map(x => Math.floor(random() * x + (36 - x)).toString(36)).join('')
 }
\ No newline at end of file