update

src/form/image-uploader.js

@@ -11,14 +11,25 @@ import '../base/icon.js'
 const EV_OPTION = { once: true }
 const DOC = document
 const ROOT = document.documentElement
+const WORKSPACE_WIDTH = 640
+const WORKSPACE_HEIGHT = 480
+const WORKSPACE_RATIO = 640 / 480
 
 function uuid() {
   return Math.random().toString(16).slice(2)
 }
 
+function round(n) {
+  n = Math.round(n)
+  if (n % 2) {
+    n--
+  }
+  return n
+}
+
 class Uploader extends Component {
   static props = {
-    value: [],
+    value: 'str!https://static.reduzixun.com/r-time/common/2cc153c8018.webp',
     accept: '*/*',
     maxSize: 0,
     disabled: false
@@ -30,6 +41,8 @@ class Uploader extends Component {
         display: flex;
         width: 100%;
         font-size: 14px;
+        -webkit-user-select: none;
+        user-select: none;
       }
       img,
       a {
@@ -42,30 +55,15 @@ class Uploader extends Component {
         width: 100%;
         padding: 6px 0;
         gap: 12px;
-        -webkit-user-select: none;
-        user-select: none;
 
         --size: var(--wc-uploader-size, 96px);
         --border-color: var(--wc-uploader-border-color, var(--color-grey-2));
         --wc-icon-size: 14px;
       }
 
-      .error {
-        display: block;
-        line-height: 1.5;
-        font-size: 12px;
-        font-style: normal;
-        color: var(--color-red-1);
-        background: none;
-      }
-
-      .limited {
-        display: none;
-      }
-
       .upload-button {
         position: relative;
-        display: inline-flex;
+        display: flex;
         flex-direction: column;
         justify-content: center;
         align-items: center;
@@ -108,11 +106,7 @@ class Uploader extends Component {
       }
     `,
     css`
-      .file-list {
+      .image-thumb {
-        display: flex;
-        gap: 12px;
-
-        .item {
         display: flex;
         align-items: center;
         justify-content: center;
@@ -153,7 +147,6 @@ class Uploader extends Component {
           }
         }
       }
-      }
     `,
 
     // disabled
@@ -194,27 +187,28 @@ class Uploader extends Component {
     //panel
     css`
       .edit-panel {
-        position: fixed;
+        position: absolute;
-        left: 50%;
+        left: 0;
-        top: 50%;
+        top: 0;
-        z-index: 99;
+        z-index: 2;
-        align-items: center;
+        display: none;
-        justify-content: center;
         width: 800px;
         height: 556px;
         padding: 16px;
+        border-radius: 6px;
         background: #fff;
         box-shadow: 0 0 16px rgba(0, 0, 0, 0.3);
-        transform: translate(-50%, -50%);
         -webkit-user-select: none;
         user-select: none;
+
+        &.show {
+          display: flex;
+          flex-direction: column;
+        }
       }
 
       .workspace {
         position: relative;
-        display: flex;
-        align-items: center;
-        justify-content: center;
         width: 640px;
         height: 480px;
 
@@ -238,9 +232,10 @@ class Uploader extends Component {
         background-position: 0 0, 8px 8px;
         box-shadow: 0 0 0 1px var(--color-grey-2);
 
-        img {
+        canvas {
-          max-width: 100%;
+          display: block;
-          max-height: 100%;
+          width: 100%;
+          height: 100%;
         }
       }
 
@@ -319,39 +314,47 @@ class Uploader extends Component {
         legend {
           font-size: 12px;
         }
+
+        .button {
+          width: 100%;
+          margin-top: 8px;
+        }
       }
       .toolbar {
         display: flex;
         gap: 6px;
         margin-top: 16px;
+      }
 
-        span {
+      .button {
         display: inline-flex;
         align-items: center;
         justify-content: center;
         height: 28px;
         padding: 0 8px;
+        gap: 4px;
         font-size: 12px;
         border: 1px solid var(--color-grey-1);
         border-radius: 4px;
         background: var(--color-plain-1);
         cursor: pointer;
       }
-      }
     `
   ]
 
-  #files = []
+  #ctx
-  #timer
+  #img
+  #panelShow = false
 
-  #workspace = {
-    w: 640,
-    h: 480
-  }
   // 原图信息
   #origin = {
-    w: 670,
+    x: 0,
-    h: 429
+    y: 0,
+    w: 0, // 原图宽度
+    h: 0, // 原图高度
+    rw: 0, // 渲染宽度
+    rh: 0, // 渲染高度
+    scale: 1 //缩放比例
   }
   #cropData = {
     x: 0,
@@ -359,74 +362,39 @@ class Uploader extends Component {
     w: 300,
     h: 300
   }
-  #ratio = 0
+  #ratio = 1
 
-  #toast(msg) {
+  #stat = {
-    this.$refs.err.textContent = msg
+    blur: false,
-    clearTimeout(this.#timer)
+    scalex: false,
-    this.#timer = setTimeout(() => {
+    scaley: false,
-      this.$refs.err.textContent = ''
+    rotate: 0,
-    }, 5000)
+    grey: false
   }
 
   #fileChange(ev) {
-    let files = [...ev.target.files]
+    let file = ev.target.files[0]
-
     ev.target.value = ''
 
-    this.#fetchUpload(files)
+    this.#initPanel(URL.createObjectURL(file))
   }
 
-  #fetchUpload(files) {
+  #fetchUpload(file) {
-    let { limit, maxSize } = this
-    let len = files.length
-
-    if (maxSize > 0) {
-      files = files.filter(it => it.size <= maxSize)
-      if (files.length < len) {
-        len = files.length
-        this.#toast(`部分文件被忽略, 单文件最大允许 ${parseSize(maxSize)}`)
-      }
-    }
-
-    if (limit > 0) {
-      files = files.slice(0, limit - this.#files.length)
-      if (files.length < len) {
-        this.#toast(`部分文件被忽略, 最多选择 ${limit} 个文件`)
-      }
-    }
-
-    if (files.length) {
-      files = files.map(file => ({ file, id: uuid(), url: '', stat: 0 }))
-
-      this.#files = this.#files.concat(files)
-
     this.$emit('upload', {
-        files,
+      file,
-        send: args => {
+      send: url => {
-          for (let it of args) {
+        this.value = url
-            it.stat = 1
+        this.#preview()
-          }
-          this.value = this.#files.map(it => it.url)
       }
     })
-      this.$requestUpdate()
-    }
   }
 
-  #remove(ev, it, id) {
+  #remove() {
-    for (let i in this.#files) {
+    this.value = ''
-      if (it === this.#files[i]) {
-        this.#files.splice(i, 1)
-        break
-      }
-    }
-    this.$requestUpdate()
   }
 
-  #preview(ev, item) {
+  #preview() {
-    this.$refs.view.firstElementChild.src =
+    this.$refs.view.firstElementChild.src = this.value
-      item.url || URL.createObjectURL(item.file)
     this.$refs.view.style.display = 'flex'
   }
 
@@ -434,25 +402,63 @@ class Uploader extends Component {
     this.$refs.view.style.display = ''
   }
 
+  #cancel() {
+    this.#panelShow = false
+    this.$requestUpdate()
+  }
+
+  #confirm() {
+    this.#export().then(bin => {
+      this.#fetchUpload(bin)
+      // this.#cancel()
+    })
+  }
+
+  #download() {
+    this.#export().then(bin => {
+      let a = document.createElement('a')
+      a.href = URL.createObjectURL(bin)
+      a.download = 'image-cropped.png'
+      a.click()
+      this.#cancel()
+    })
+  }
+
+  #export() {
+    let { x, y, w, h } = this.#cropData
+    let data = this.#ctx.getImageData(x, y, w, h)
+    let can = new OffscreenCanvas(w, h)
+    let ctx = can.getContext('2d')
+
+    ctx.putImageData(data, 0, 0)
+    return can.convertToBlob({ type: 'image/png', quality: 0.95 })
+  }
+
   #handleDrag(ev) {
     let elem = ev.currentTarget
     let outer = elem.parentNode
     let { top: _top, left: _left } = offset(outer)
     let { top, left } = offset(elem)
-    let { clientHeight: hh, clientWidth: ww } = outer
+    let { rw, rh } = this.#origin
     let { w, h } = this.#cropData
 
     let ax = ev.x - left
     let ay = ev.y - top
+    let ww = WORKSPACE_WIDTH
+    let hh = WORKSPACE_HEIGHT
 
-    ww -= w
+    let _x = (ww - rw) / 2
-    hh -= h
+    let _y = (hh - rh) / 2
+
+    ww -= w + _x
+    hh -= h + _y
 
     let callback = bind(DOC, 'mousemove', ({ x, y }) => {
       x -= _left + ax
       y -= _top + ay
-      x = x < 0 ? 0 : x > ww ? ww : x
+      x = x < _x ? _x : x > ww ? ww : x
-      y = y < 0 ? 0 : y > hh ? hh : y
+      y = y < _y ? _y : y > hh ? hh : y
+
       this.#cropData.x = x
       this.#cropData.y = y
       elem.style.cssText = `left:${x}px;top:${y}px;width:${w}px;height:${h}px;`
@@ -465,46 +471,117 @@ class Uploader extends Component {
       return
     }
     let ratio = +ev.target.dataset.ratio
-    let { w: ww, h: hh } = this.#workspace
+
-    let { w, h } = this.#origin
+    let { rw, rh } = this.#origin
     let { x, y } = this.#cropData
 
     this.#ratio = ratio
 
     if (ratio > 0) {
-      let min = Math.min(w, h)
+      let min = Math.min(rw, rh)
-      if (ratio < 1) {
+      if (ratio <= 1) {
-      } else if (ratio === 1) {
+        rh = min
-        w = min
+        rw = round(rh * ratio)
-        h = min
-        this.#cropData.w = w
-        this.#cropData.h = h
       } else {
+        rw = min
+        rh = round(rw / ratio)
       }
 
-      this.$refs.crop.style.cssText = `left:${x}px;top:${y}px;width:${w}px;height:${h}px;`
+      x = (WORKSPACE_WIDTH - rw) / 2
+      y = (WORKSPACE_HEIGHT - rh) / 2
+
+      this.#cropData = { w: rw, h: rh, x, y }
+
+      this.$refs.crop.style.cssText = `left:${x}px;top:${y}px;width:${rw}px;height:${rh}px;`
     }
   }
 
-  mounted() {}
+  #rotate() {
+    let ctx = this.#ctx
+    let { x, y, w, h, rw, rh } = this.#origin
+
+    // ctx.save()
+    ctx.clearRect(0, 0, WORKSPACE_WIDTH, WORKSPACE_HEIGHT)
+    ctx.translate(WORKSPACE_WIDTH / 2, WORKSPACE_HEIGHT / 2)
+    ctx.rotate((90 * Math.PI) / 180)
+    ctx.drawImage(this.#img, x - w / 2, y - h / 2, rw, rh)
+    // ctx.restore()
+    console.log('<><><><>')
+  }
+  #scale() {}
+
+  #filter(type) {
+    if (type === 'blur') {
+      this.#stat.blur = !this.#stat.blur
+      let { x, y, rw, rh } = this.#origin
+      this.#ctx.filter = this.#stat.blur ? 'blur(6px)' : 'none'
+      // this.#ctx.clearRect(0, 0, WORKSPACE_WIDTH, WORKSPACE_HEIGHT)
+      this.#ctx.drawImage(this.#img, x, y, rw, rh)
+    }
+  }
+
+  #initPanel(url) {
+    let img = new Image()
+
+    this.#img = img
+    this.#ctx.clearRect(0, 0, WORKSPACE_WIDTH, WORKSPACE_HEIGHT)
+
+    img.onload = _ => {
+      let { naturalWidth: w, naturalHeight: h } = img
+      let scale = 1
+      let ratio = w / h
+      let rw, rh
+
+      if (ratio > WORKSPACE_RATIO) {
+        rw = WORKSPACE_WIDTH
+        scale = rw / w
+        rh = round(scale * h)
+      } else if (ratio === WORKSPACE_RATIO) {
+        rw = WORKSPACE_HEIGHT
+        rh = rw
+        scale = rw / w
+      } else {
+        rh = WORKSPACE_HEIGHT
+        scale = rh / h
+        rw = round(scale * w)
+      }
+      let x = (WORKSPACE_WIDTH - rw) / 2
+      let y = (WORKSPACE_HEIGHT - rh) / 2
+      this.#origin = { x, y, w, h, rw, rh, scale }
+      this.#ctx.drawImage(img, x, y, rw, rh)
+      this.#changeCropRatio({ target: { dataset: { ratio: 1 } } })
+      this.#panelShow = true
+      this.$requestUpdate()
+    }
+    img.src = url
+  }
+
+  mounted() {
+    this.#ctx = this.$refs.can.getContext('2d', { willReadFrequently: true })
+    fetch(this.value)
+      .then(r => r.blob())
+      .then(b => {
+        this.#initPanel(URL.createObjectURL(b))
+      })
+  }
 
   render() {
     let { disabled } = this
-    let limited = this.#files.length > 0
-    let { w, h, x, y } = this.#cropData
-    let cropStyle = styleMap({
-      width: w + 'px',
-      height: h + 'px',
-      left: x + 'px',
-      top: y + 'px'
-    })
-
-    console.log(cropStyle)
 
     return html`
       <main class="container">
-        <header class="action-area ${limited ? 'limited' : ''}">
+        ${this.value
-          <div ref="button" class="upload-button" @drop.prevent>
+          ? html`
+              <section
+                class="image-thumb"
+                style=${styleMap({ backgroundImage: `url(${this.value})` })}
+              >
+                <wc-icon name="search" @click=${this.#preview}></wc-icon>
+                <wc-icon name="trash" @click=${this.#remove}></wc-icon>
+              </section>
+            `
+          : html`
+              <section ref="button" class="upload-button" @drop.prevent>
                 <wc-icon name="upload"></wc-icon>
                 <span>选择图片</span>
                 <input
@@ -512,51 +589,18 @@ class Uploader extends Component {
                   title
                   type="file"
                   accept="image/*"
-              disabled=${disabled || limited}
+                  disabled=${disabled}
                   @change=${this.#fileChange}
                 />
-          </div>
-          <mark ref="err" class="error"></mark>
-        </header>
-
-        <footer
-          class="file-list"
-          style=${styleMap({ display: this.#files.length ? '' : 'none' })}
-        >
-          ${this.#files.map(
-            it => html`
-              <section
-                class="item"
-                style=${styleMap({
-                  backgroundImage: `url(${it.url})`
-                })}
-              >
-                <wc-icon
-                  name=${it.stat === 0 ? 'loading' : 'search'}
-                  @click=${ev => this.#preview(ev, it)}
-                ></wc-icon>
-
-                <wc-icon
-                  class="del"
-                  name="trash"
-                  data-id=${it.id}
-                  @click=${ev => this.#remove(ev, it, it.id)}
-                ></wc-icon>
               </section>
-            `
+            `}
-          )}
+
-        </footer>
+        <div class="edit-panel ${this.#panelShow ? 'show' : ''}">
-      </main>
-      <div class="preview" ref="view" @click.self=${this.#closePreview}>
-        <img />
-      </div>
-      <div class="edit-panel">
           <div class="workspace">
-          <img src="//static.reduzixun.com/r-time/common/2cc153c8018.webp" />
+            <canvas ref="can" width="640" height="480"></canvas>
             <div
               ref="crop"
               class="crop-area"
-            style=${cropStyle}
               @mousedown.prevent=${this.#handleDrag}
             >
               <i data-id="1"></i>
@@ -590,16 +634,33 @@ class Uploader extends Component {
               <legend>现体积</legend>
               <span>800KB</span>
             </fieldset>
+
+            <span class="button" @click=${this.#cancel}
+              ><wc-icon name="deny"></wc-icon>取消</span
+            >
+            <span class="button" @click=${this.#confirm}
+              ><wc-icon name="upload"></wc-icon>确定</span
+            >
+            <span class="button" @click=${this.#download}
+              ><wc-icon name="download"></wc-icon>下载</span
+            >
           </aside>
+
           <footer class="toolbar">
-          <span>旋转90度</span>
+            <span class="button" @click=${this.#rotate}>旋转90度</span>
-          <span>左右翻转</span>
+            <span class="button" @click=${this.#scale}>左右翻转</span>
-          <span>上下翻转</span>
+            <span class="button" @click=${this.#scale}>上下翻转</span>
-          <span>去色</span>
+            <span class="button" @click=${_ => this.#filter('greyscale')}
-          <span>高斯模糊</span>
+              >去色</span
-          <span>增加水印</span>
+            >
+            <span class="button">增加水印</span>
           </footer>
         </div>
+      </main>
+
+      <div class="preview" ref="view" @click.self=${this.#closePreview}>
+        <img />
+      </div>
     `
   }
 }