feat(c-file-upload): paste image

Property paste-image to allow pasting an image directly from clipboard

src/ui/c-file-upload/c-file-upload.vue

@@ -5,10 +5,12 @@ const props = withDefaults(defineProps<{
   multiple?: boolean
   accept?: string
   title?: string
+  pasteImage?: boolean
 }>(), {
   multiple: false,
   accept: undefined,
   title: 'Drag and drop files here, or click to select files',
+  pasteImage: false,
 });
 
 const emit = defineEmits<{
@@ -16,11 +18,31 @@ const emit = defineEmits<{
   (event: 'fileUpload', file: File): void
 }>();
 
-const { multiple } = toRefs(props);
+const { multiple, pasteImage } = toRefs(props);
 
 const isOverDropZone = ref(false);
 
+function toBase64(file: File) {
+  return new Promise<string>((resolve, reject) => {
+    const reader = new FileReader();
+    reader.readAsDataURL(file);
+    reader.onload = () => resolve(reader.result?.toString() ?? '');
+    reader.onerror = error => reject(error);
+  });
+}
+
 const fileInput = ref<HTMLInputElement | null>(null);
+const imgPreview = ref<HTMLImageElement | null>(null);
+async function handlePreview(image: File) {
+  if (imgPreview.value) {
+    imgPreview.value.src = await toBase64(image);
+  }
+}
+function clearPreview() {
+  if (imgPreview.value) {
+    imgPreview.value.src = '';
+  }
+}
 
 function triggerFileInput() {
   fileInput.value?.click();
@@ -39,7 +61,30 @@ function handleDrop(event: DragEvent) {
   handleUpload(files);
 }
 
-function handleUpload(files: FileList | null | undefined) {
+async function onPasteImage(evt: ClipboardEvent) {
+  if (!pasteImage.value) {
+    return false;
+  }
+
+  const items = evt.clipboardData?.items;
+  if (!items) {
+    return false;
+  }
+  for (let i = 0; i < items.length; i++) {
+    if (items[i].type.includes('image')) {
+      const imageFile = items[i].getAsFile();
+      if (imageFile) {
+        await handlePreview(imageFile);
+        emit('fileUpload', imageFile);
+      }
+    }
+  }
+  return true;
+}
+
+async function handleUpload(files: FileList | null | undefined) {
+  clearPreview();
+
   if (_.isNil(files) || _.isEmpty(files)) {
     return;
   }
@@ -49,6 +94,7 @@ function handleUpload(files: FileList | null | undefined) {
     return;
   }
 
+  await handlePreview(files[0]);
   emit('fileUpload', files[0]);
 }
 </script>
@@ -60,6 +106,7 @@ function handleUpload(files: FileList | null | undefined) {
       'border-primary border-opacity-100': isOverDropZone,
     }"
     @click="triggerFileInput"
+    @paste.prevent="onPasteImage"
     @drop.prevent="handleDrop"
     @dragover.prevent
     @dragenter="isOverDropZone = true"
@@ -73,6 +120,7 @@ function handleUpload(files: FileList | null | undefined) {
       :accept="accept"
       @change="handleFileInput"
     >
+
     <slot>
       <span op-70>
         {{ title }}
@@ -90,6 +138,22 @@ function handleUpload(files: FileList | null | undefined) {
       <c-button>
         Browse files
       </c-button>
+
+      <div v-if="pasteImage">
+        <!-- separator -->
+        <div my-4 w-full flex items-center justify-center op-70>
+          <div class="h-1px max-w-100px flex-1 bg-gray-300 op-50" />
+          <div class="mx-2 text-gray-400">
+            or
+          </div>
+          <div class="h-1px max-w-100px flex-1 bg-gray-300 op-50" />
+        </div>
+
+        <p>Paste an image from clipboard</p>
+      </div>
     </slot>
+    <div mt-2>
+      <img ref="imgPreview" width="150">
+    </div>
   </div>
 </template>