add drag and drop support

lib/components/content.js

@@ -1,5 +1,6 @@
 
 import Key from '../utils/key'
+import Selection from '../models/selection'
 import OffsetKey from '../utils/offset-key'
 import Raw from '../serializers/raw'
 import React from 'react'
@@ -120,7 +121,6 @@ class Content extends React.Component {
   onBlur = (e) => {
     if (this.props.readOnly) return
     if (this.tmp.isCopying) return
-    if (this.tmp.isComposing) return
     let { state } = this.props
 
     state = state
@@ -180,7 +180,6 @@ class Content extends React.Component {
    */
 
   onCopy = (e) => {
-    if (this.tmp.isComposing) return
     this.onCutCopy(e)
   }
 
@@ -192,7 +191,6 @@ class Content extends React.Component {
 
   onCut = (e) => {
     if (this.props.readOnly) return
-    if (this.tmp.isComposing) return
     this.onCutCopy(e)
 
     // Once the cut has successfully executed, delete the current selection.
@@ -260,6 +258,121 @@ class Content extends React.Component {
     })
   }
 
+  /**
+   * On drag end, unset the `isDragging` flag.
+   *
+   * @param {Event} e
+   */
+
+  onDragEnd = (e) => {
+    this.tmp.isDragging = false
+  }
+
+  /**
+   * On drag over, set the `isDragging` flag and the `isInternalDrag` flag.
+   *
+   * @param {Event} e
+   */
+
+  onDragOver = (e) => {
+    if (this.tmp.isDragging) return
+    this.tmp.isDragging = true
+    this.tmp.isInternalDrag = false
+  }
+
+  /**
+   * On drag start, set the `isDragging` flag and the `isInternalDrag` flag.
+   *
+   * @param {Event} e
+   */
+
+  onDragStart = (e) => {
+    this.tmp.isDragging = true
+    this.tmp.isInternalDrag = true
+  }
+
+  /**
+   * On drop.
+   *
+   * @param {Event} e
+   */
+
+  onDrop = (e) => {
+    if (this.props.readOnly) return
+    e.preventDefault()
+
+    const { state } = this.props
+    const { selection } = state
+    const data = e.nativeEvent.dataTransfer
+    const drop = {}
+
+    // Resolve the point where the drop occured.
+    const { x, y } = e.nativeEvent
+    const range = window.document.caretRangeFromPoint(x, y)
+    const startNode = range.startContainer
+    const startOffset = range.startOffset
+    const point = OffsetKey.findPoint(startNode, startOffset, state)
+    let target = Selection.create({
+      anchorKey: point.key,
+      anchorOffset: point.offset,
+      focusKey: point.key,
+      focusOffset: point.offset,
+      isFocused: true
+    })
+
+    // If the drag is internal, handle it now. And it the target is after the
+    // selection, it needs to account for the selection's content being deleted.
+    if (this.tmp.isInternalDrag) {
+      if (
+        selection.endKey == target.endKey &&
+        selection.endOffset < target.endOffset
+      ) {
+        const width = selection.startKey == selection.endKey
+          ? selection.endOffset - selection.startOffset
+          : selection.endOffset
+
+        target = target.moveBackward(width)
+      }
+
+      const fragment = state.fragment
+      const next = state
+        .transform()
+        .delete()
+        .moveTo(target)
+        .insertFragment(fragment)
+        .apply()
+
+      this.onChange(next)
+      return
+    }
+
+    // COMPAT: In Firefox, `types` is array-like. (2016/06/21)
+    const types = Array.from(data.types)
+
+    // Handle files.
+    if (data.files.length) {
+      drop.type = 'files'
+      drop.files = data.files
+    }
+
+    // Handle HTML.
+    else if (includes(types, 'text/html')) {
+      drop.type = 'html'
+      drop.text = data.getData('text/plain')
+      drop.html = data.getData('text/html')
+    }
+
+    // Handle plain text.
+    else {
+      drop.type = 'text'
+      drop.text = data.getData('text/plain')
+    }
+
+    drop.data = data
+    drop.target = target
+    this.props.onDrop(e, drop)
+  }
+
   /**
    * On key down, prevent the default behavior of certain commands that will
    * leave the editor in an out-of-sync state, then bubble up.
@@ -302,8 +415,8 @@ class Content extends React.Component {
 
   onPaste = (e) => {
     if (this.props.readOnly) return
-    if (this.tmp.isComposing) return
     e.preventDefault()
+
     const data = e.clipboardData
     const paste = {}
 
@@ -311,7 +424,7 @@ class Content extends React.Component {
     const types = Array.from(data.types)
 
     // Handle files.
-    if (data.files.length != 0) {
+    if (data.files.length) {
       paste.type = 'files'
       paste.files = data.files
     }
@@ -434,20 +547,24 @@ class Content extends React.Component {
     return (
       <div
         key={`slate-content-${this.forces}`}
-        className={className}
         contentEditable={!readOnly}
         suppressContentEditableWarning
-        style={style}
+        className={className}
         onBeforeInput={this.onBeforeInput}
         onBlur={this.onBlur}
         onCompositionEnd={this.onCompositionEnd}
         onCompositionStart={this.onCompositionStart}
         onCopy={this.onCopy}
         onCut={this.onCut}
+        onDragEnd={this.onDragEnd}
+        onDragOver={this.onDragOver}
+        onDragStart={this.onDragStart}
+        onDrop={this.onDrop}
         onKeyDown={this.onKeyDown}
+        onKeyUp={noop}
         onPaste={this.onPaste}
         onSelect={this.onSelect}
-        onKeyUp={noop}
+        style={style}
       >
         {children}
       </div>

lib/components/editor.js

@@ -25,6 +25,7 @@ class Editor extends React.Component {
     onBeforeInput: React.PropTypes.func,
     onChange: React.PropTypes.func.isRequired,
     onDocumentChange: React.PropTypes.func,
+    onDrop: React.PropTypes.func,
     onKeyDown: React.PropTypes.func,
     onPaste: React.PropTypes.func,
     onSelectionChange: React.PropTypes.func,
@@ -170,6 +171,16 @@ class Editor extends React.Component {
     this.onEvent('onBeforeInput', ...args)
   }
 
+  /**
+   * On drop.
+   *
+   * @param {Mixed} ...args
+   */
+
+  onDrop = (...args) => {
+    this.onEvent('onDrop', ...args)
+  }
+
   /**
    * On key down.
    *
@@ -201,14 +212,15 @@ class Editor extends React.Component {
       <Content
         className={this.props.className}
         editor={this}
-        state={this.state.state}
+        onBeforeInput={this.onBeforeInput}
         onChange={this.onChange}
+        onDrop={this.onDrop}
+        onKeyDown={this.onKeyDown}
+        onPaste={this.onPaste}
         readOnly={this.props.readOnly}
         renderMark={this.renderMark}
         renderNode={this.renderNode}
-        onPaste={this.onPaste}
-        onBeforeInput={this.onBeforeInput}
-        onKeyDown={this.onKeyDown}
+        state={this.state.state}
         style={this.props.style}
       />
     )

lib/plugins/core.js

@@ -110,43 +110,26 @@ function Plugin(options = {}) {
     /**
      * The core `onBeforeInput` handler.
      *
-     *
-     *
-     *
-     *
-     * Otherwise, we can allow the default, native text insertion, avoiding a
-     * re-render for improved performance.
-     *
      * @param {Event} e
      * @param {State} state
      * @param {Editor} editor
-     * @return {State or Null} newState
+     * @return {State or Null}
      */
 
     onBeforeInput(e, state, editor) {
       const transform = state.transform().insertText(e.data)
       const synthetic = transform.apply()
       const resolved = editor.resolveState(synthetic)
-      let isNative = true
 
-      // If the current selection is expanded, we have to re-render.
-      if (state.isExpanded) {
-        isNative = false
-      }
+      // We do not have to re-render if the current selection is collapsed, the
+      // current node is not empty, and the new state has the same decorations
+      // as the current one.
+      const isNative = (
+        state.isCollapsed &&
+        state.startText.text != '' &&
+        resolved.equals(synthetic)
+      )
 
-      // If the current node was empty, we have to re-render so that any empty
-      // placeholder logic will be updated.
-      if (state.startText.text == '') {
-        isNative = false
-      }
-
-      // If the next state resolves a new list of decorations for any of its
-      // text nodes, we have to re-render.
-      else if (!resolved.equals(synthetic)) {
-        isNative = false
-      }
-
-      // Update the state with the proper `isNative`.
       state = isNative
         ? transform.apply({ isNative })
         : synthetic
@@ -155,13 +138,43 @@ function Plugin(options = {}) {
       return state
     },
 
+    /**
+     * The core `onDrop` handler.
+     *
+     * @param {Event} e
+     * @param {Object} drop
+     * @param {State} state
+     * @param {Editor} editor
+     * @return {State or Null}
+     */
+
+    onDrop(e, drop, state, editor) {
+      switch (drop.type) {
+        case 'text':
+        case 'html': {
+          let transform = state
+            .transform()
+            .moveTo(drop.target)
+
+          drop.text
+            .split('\n')
+            .forEach((line, i) => {
+              if (i > 0) transform = transform.splitBlock()
+              transform = transform.insertText(line)
+            })
+
+          return transform.apply()
+        }
+      }
+    },
+
     /**
      * The core `onKeyDown` handler.
      *
      * @param {Event} e
      * @param {State} state
      * @param {Editor} editor
-     * @return {State or Null} newState
+     * @return {State or Null}
      */
 
     onKeyDown(e, state, editor) {
@@ -267,7 +280,7 @@ function Plugin(options = {}) {
      * @param {Object} paste
      * @param {State} state
      * @param {Editor} editor
-     * @return {State or Null} newState
+     * @return {State or Null}
      */
 
     onPaste(e, paste, state, editor) {
@@ -301,7 +314,6 @@ function Plugin(options = {}) {
   }
 }
 
-
 /**
  * Export.
  */