From 8a8a1fc4044a26841775c07414dc6da0368d1ab4 Mon Sep 17 00:00:00 2001
From: yutent <yutent.io@gmail.com>
Date: Wed, 29 Mar 2023 17:30:09 +0800
Subject: [PATCH] =?UTF-8?q?=E8=BF=81=E7=A7=BB=E6=8B=96=E6=8B=BD=E6=8F=92?=
 =?UTF-8?q?=E4=BB=B6?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/drag/core.js   | 137 +++++++++++++++++++++++++++++++++++++++++++++
 src/form/switch.js |   2 +-
 2 files changed, 138 insertions(+), 1 deletion(-)
 create mode 100644 src/drag/core.js

diff --git a/src/drag/core.js b/src/drag/core.js
new file mode 100644
index 0000000..c0511bb
--- /dev/null
+++ b/src/drag/core.js
@@ -0,0 +1,137 @@
+/**
+ * 拖拽插件的核心部分
+ * @author yutent<yutent.io@gmail.com>
+ * @date 2019/08/23 19:41:21
+ */
+
+import { $, bind, unbind, fire } from '@bd/core'
+
+const DEF_OPT = {
+  axis: '', // x | y | xy 拖拽方向
+  limit: false, // false | window | parent 拖拽范围
+  overflow: true // 是否可拖拽出可视区外
+}
+
+export default class Drag {
+  constructor(elem) {
+    this.$elem = elem
+
+    this.#init()
+  }
+
+  #init() {
+    this.$elem.style.transform = ''
+    var { x, y } = this.$elem.getBoundingClientRect()
+    // _x, _y是位移,用于数据修正
+    this.pos = { x, y, _x: 0, _y: 0 }
+  }
+
+  // drag by
+  by(node, opt = {}) {
+    this.$drag = node
+    this.opt = Object.assign(Object.create(null), DEF_OPT, opt)
+
+    //
+    if (this.opt.limit !== false) {
+      this.opt.overflow = false
+    }
+
+    // 鼠标状态图标
+    node.style.cursor = 'move'
+
+    this._handleResize = bind(window, 'resize', this.#init.bind(this))
+
+    // let
+    this._handleMousedown = bind(node, 'mousedown', ev => {
+      if (this.disabled) {
+        return
+      }
+      var bcr = this.$elem.getBoundingClientRect()
+
+      /* 修正由于页面有滚动距离,导致拖拽位移计算不正确的情况 */
+      if (bcr.x - this.pos._x !== this.pos.x) {
+        this.pos.x = bcr.x - this.pos._x
+      }
+      if (bcr.y - this.pos._y !== this.pos.y) {
+        this.pos.y = bcr.y - this.pos._y
+      }
+
+      let mx = ev.pageX
+      let my = ev.pageY
+
+      let ww = document.documentElement.clientWidth
+      let wh = document.documentElement.clientHeight
+
+      let tw = bcr.width
+      let th = bcr.height
+
+      //限制区域, 4个值依次是: 上, 右, 下, 左
+      let limit = [0, ww - tw, wh - th, 0]
+      if (this.opt.limit === 'parent') {
+        let pbcr = this.$elem.parentNode.getBoundingClientRect()
+        limit = [pbcr.top, pbcr.right - tw, pbcr.bottom - th, pbcr.left]
+      }
+
+      let handleMove = bind(document, 'mousemove', ev => {
+        // 防止拖动到边缘时导致页面滚动
+        ev.preventDefault()
+
+        let _x = ev.pageX - mx + (bcr.x - this.pos.x)
+        let _y = ev.pageY - my + (bcr.y - this.pos.y)
+
+        // 将另外一个方向的值清零来实现单向拖拽
+        if (this.opt.axis === 'x') {
+          _y = 0
+        }
+        if (this.opt.axis === 'y') {
+          _x = 0
+        }
+
+        // 限制不可拖拽出指定区域(可视区或者父容器)
+        if (this.opt.overflow === false) {
+          if (_x < limit[3] - this.pos.x) {
+            _x = limit[3] - this.pos.x
+          } else if (_x > limit[1] - this.pos.x) {
+            _x = limit[1] - this.pos.x
+          }
+
+          if (_y < limit[0] - this.pos.y) {
+            _y = limit[0] - this.pos.y
+          } else if (_y > limit[2] - this.pos.y) {
+            _y = limit[2] - this.pos.y
+          }
+        }
+        this.pos._x = _x
+        this.pos._y = _y
+        fire(this.$elem, 'dragging', {
+          offset: {
+            x: this.pos.x + _x,
+            y: this.pos.y + _y
+          },
+          moved: { x: _x, y: _y }
+        })
+        this.$elem.style.transform = `translate(${_x}px, ${_y}px)`
+      })
+
+      let handleUp = bind(document, 'mouseup', ev => {
+        fire(this.$elem, 'dragged', {
+          offset: {
+            x: this.pos.x + this.pos._x,
+            y: this.pos.y + this.pos._y
+          },
+          moved: { x: this.pos._x, y: this.pos._y }
+        })
+
+        unbind(document, 'mousemove', handleMove)
+        unbind(document, 'mouseup', handleUp)
+      })
+    })
+
+    return this
+  }
+
+  destroy() {
+    unbind(window, 'resize', this._handleResize)
+    unbind(this.$drag, 'mousedown', this._handleMousedown)
+  }
+}
diff --git a/src/form/switch.js b/src/form/switch.js
index 1e2385d..b6d2451 100644
--- a/src/form/switch.js
+++ b/src/form/switch.js
@@ -201,7 +201,7 @@ class Switch extends Component {
       @click=${this.handleClick}
       @keydown=${this.handleClick}
     >
-      <span class="dot"><wc-icon name="get"></wc-icon></span>
+      <span class="dot"></span>
       <slot></slot>
     </label>`
   }