Create dropdown menu (WIP)

src/components/DropdownMenu.scss

@@ -0,0 +1,46 @@
+@import '../styles.scss';
+
+.menu-dropdown {
+  position: relative;
+  overflow: visible;
+
+  ul {
+    margin: 0;
+    padding: 0;
+
+    li {
+      margin: 0;
+      padding: 0;
+      list-style-type : none;
+    }
+  }
+
+  .items {
+    display: none;
+    position: absolute;
+    top: 100%;
+    left: 0;
+    background: white;
+    z-index: 2;
+    color: $black;
+    box-shadow: $box-shadow;
+
+    &.visible {
+      display: block;
+    }
+
+    button {
+      width: 100%;
+      text-align: left;
+
+      &:hover {
+        background: $background-gray;
+      }
+
+      &:disabled {
+        color: $gray;
+        background: unset;
+      }
+    }
+  }
+}

src/components/DropdownMenu.svelte

@@ -0,0 +1,63 @@
+<script>
+  import Icon from 'svelte-awesome'
+  import { faCaretDown } from '@fortawesome/free-solid-svg-icons'
+  import { onDestroy, onMount } from 'svelte'
+  import { keyComboFromEvent} from '../utils/keyBindings.js'
+
+  /** @type {MenuDropdownItem[]} */
+  export let items = []
+  
+  export let title = null
+  export let width = '120px'
+  export let visible = false
+  export let disabled = false
+  
+  function toggleShow (event) {
+    event.stopPropagation()
+    visible = !visible
+  }
+
+  function handleClick () {
+    visible = false
+  }
+
+  function handleKeyDown (event) {
+    const combo = keyComboFromEvent(event)
+    if (combo === 'Escape') {
+        event.preventDefault()
+        visible = false
+      }
+  }
+
+  onMount(() => {
+    document.addEventListener('click', handleClick)
+    document.addEventListener('keydown', handleKeyDown)
+  })
+  
+  onDestroy(() => {
+    document.removeEventListener('click', handleClick)
+    document.removeEventListener('keydown', handleKeyDown)
+  })
+</script>
+
+<div class="menu-dropdown" title={title} on:click={handleClick}>
+  <slot name="defaultItem"></slot>
+
+  <button on:click={toggleShow}>
+    <Icon data={faCaretDown} />
+  </button>
+
+  <div class="items" class:visible style="width: {width};">
+    <ul>
+      {#each items as item}
+        <li>
+          <button on:click={item.onClick} disabled={disabled}>
+            {item.text}
+          </button>
+        </li>
+      {/each}
+      </ul>
+  </div>
+</div>
+
+<style src="./DropdownMenu.scss"></style>

src/components/JSONEditor.svelte

@@ -45,8 +45,6 @@
 
   let selection = null
   let clipboard = null
-  $: hasSelectionContents = selection != null && selection.paths != null
-  $: hasClipboardContents = clipboard != null && selection != null
 
   $: state = syncState(doc, state, [], (path) => path.length < 1)
 
@@ -209,6 +207,15 @@
     }
   }
 
+  function handleInsert() {
+
+    if (selection != null) {
+      console.log('insert', { selection })
+
+      // TODO: impelemnt insert
+    }
+  }
+
   // TODO: cleanup
   $: console.log('doc', doc)
   $: console.log('state', state)
@@ -382,6 +389,10 @@
         event.preventDefault()
         handleDuplicate()
       }
+      if (combo === 'Ctrl+Insert' || combo === 'Command+Insert') {
+        event.preventDefault()
+        handleInsert()
+      }
       if (combo === 'Escape') {
         event.preventDefault()
         selection = null
@@ -433,8 +444,8 @@
     searchText={searchText}
     searchResult={searchResult}
     bind:showSearch
-    hasSelectionContents={hasSelectionContents}
-    hasClipboardContents={hasClipboardContents}
+    selection={selection}
+    clipboard={clipboard}
     
     onCut={handleCut}
     onCopy={handleCopy}

src/components/JSONNode.svelte

@@ -1,6 +1,7 @@
 <script>
   import { debounce, isEqual } from 'lodash-es'
   import { rename } from '../logic/operations.js'
+  import { singleton } from './singleton.js'
   import {
     DEBOUNCE_DELAY,
     DEFAULT_LIMIT,
@@ -39,12 +40,6 @@
   export let onSelect
   export let selection
   
-  const singleton = {
-    mousedown: false,
-    selectionAnchor: null, // Path
-    selectionFocus: null // Path
-  }
-
   $: expanded = state && state[STATE_EXPANDED]
   $: limit = state && state[STATE_LIMIT]
   $: props = state && state[STATE_PROPS]

src/components/Menu.svelte

@@ -1,13 +1,14 @@
 <script>
   import Icon from 'svelte-awesome'
-  import { faCut, faClone, faCopy, faPaste, faSearch, faUndo, faRedo } from '@fortawesome/free-solid-svg-icons'
+  import { faCut, faClone, faCopy, faPaste, faSearch, faUndo, faRedo, faPlus } from '@fortawesome/free-solid-svg-icons'
   import SearchBox from './SearchBox.svelte'
+  import DropdownMenu from './DropdownMenu.svelte'
 
   export let searchText
   export let searchResult
   export let showSearch = false
-  export let hasSelectionContents
-  export let hasClipboardContents
+  export let selection
+  export let clipboard
   export let historyState
 
   export let onCut
@@ -21,6 +22,10 @@
   export let onNextSearchResult
   export let onPreviousSearchResult
 
+  $: hasSelection = selection != null
+  $: hasSelectionContents = selection != null && selection.paths != null
+  $: hasClipboardContents = clipboard != null && selection != null
+
   function handleToggleSearch() {
     showSearch = !showSearch
   }
@@ -30,6 +35,36 @@
     onSearchText('')
   }
 
+  function handleInsertValue () {
+    console.log('TODO: insert value')
+  }
+
+  /** @type {MenuDropdownItem[]} */
+  const insertItems = [
+    {
+      text: "Insert value",
+      onClick: handleInsertValue,
+      default: true
+    },
+    {
+      text: "Insert object",
+      onClick: () => {
+        console.log('TODO: insert object')
+      }
+    },
+    {
+      text: "Insert array",
+      onClick: () => {
+        console.log('TODO: insert array')
+      }
+    },
+    {
+      text: "Insert structure",
+      onClick: () => {
+        console.log('TODO: insert structure')
+      }
+    }
+  ]
 </script>
 
 <div class="menu">
@@ -69,6 +104,21 @@
     <Icon data={faClone} />
   </button>
 
+  <DropdownMenu 
+    items={insertItems} 
+    title="Insert new value (Ctrl+Insert)"
+    disabled={!hasSelection}
+  >
+    <button 
+      class="button insert"
+      slot="defaultItem" 
+      on:click={handleInsertValue}
+      disabled={!hasSelection}
+    >
+      <Icon data={faPlus} />
+    </button>
+  </DropdownMenu>
+
   <div class="separator"></div>
 
   <button

src/components/SearchBox.scss

@@ -6,7 +6,7 @@ $search-size: 24px;
   border: 2px solid $theme-color;
   border-radius: $border-radius;
   background: $white;
-  box-shadow: 0 2px 6px 0 rgba(0, 0, 0, 0.24);
+  box-shadow: $box-shadow;
 
   .search-form {
     display: flex;

src/components/singleton.js

@@ -0,0 +1,6 @@
+// used by JSONNode during dragging
+export const singleton = {
+  mousedown: false,
+  selectionAnchor: null, // Path
+  selectionFocus: null // Path
+}

src/styles.scss

@@ -26,6 +26,7 @@ $gray: #9d9d9d;
 $gray-icon: $gray;
 $light-gray: #c0c0c0;
 $selection-background: #e0e0e0;
+$background-gray: #f5f5f5;
 
 $line-height: 18px;
 $indentation-width: 18px; // IMPORTANT: keep in sync with js constant INDENTATION_WIDTH
@@ -36,3 +37,15 @@ $border-radius: 3px;
 
 $menu-padding: 5px;
 $bottom-height: 5px;
+
+$box-shadow: 0 2px 6px 0 rgba(0, 0, 0, 0.24);
+
+button {
+  border: none;
+  background: transparent;
+  color: inherit;
+  cursor: pointer;
+  font-family: $font-family-menu;
+  font-size: $font-size;
+  padding: $menu-padding;
+}

src/types.js

@@ -75,3 +75,10 @@
 /**
  * @typedef {MultiSelectionSchema  | BeforeSelection | AppendSelection} SelectionSchema
  */
+
+/**
+ * @typedef {Object} MenuDropdownItem
+ * @property {string} text
+ * @property {function} onClick
+ * @property {boolean} [default=false]
+ **/