Add kick sequencer

1 files changed, 60 insertions, 0 deletions

diff --git a/src/view/sequencer.ts b/src/view/sequencer.ts
new file mode 100644
index 0000000..150f89b
--- /dev/null
+++ b/src/view/sequencer.ts
@@ -0,0 +1,60 @@
+import h, { classNames } from 'lib/h'
+import * as soundsLib from 'sounds'
+import * as play from 'view/sequencer/play'
+import * as addRemoveBeat from 'view/sequencer/addRemoveBeat'
+import * as block from 'view/sequencer/block'
+
+export function view() {
+  let index = -1
+  let blocks = [true]
+  let blocksNode = h('div', 
+    { className: 'g-Sequencer__Blocks' }, 
+    block.view({ 
+      checked: true,
+      onCheck: checked => blocks[0] = checked
+    })
+  )
+
+  let onNextStep = (sounds: soundsLib.Sounds) => {
+    let oldIndex = index
+    let newIndex = (index + 1) % blocks.length
+    index = newIndex
+
+    let oldBlock = blocksNode.childNodes[oldIndex] as HTMLElement
+    if (oldBlock !== undefined) oldBlock.classList.remove('g-Sequencer__Block--Beat')
+
+    let newBlock = blocksNode.childNodes[newIndex] as HTMLElement
+    newBlock.classList.add('g-Sequencer__Block--Beat')
+
+    if (blocks[newIndex]) soundsLib.playKick(sounds)
+  }
+
+  let sequencer = h('div', { className: 'g-Sequencer' },
+    play.view({
+      onNextStep,
+      onStop: () => {
+        let block = blocksNode.childNodes[index] as HTMLElement
+        block.classList.remove('g-Sequencer__Block--Beat')
+        index = -1
+      }
+    }),
+    addRemoveBeat.view({
+      initBeats: 1,
+      onRemove: index => {
+        let lastBlock = blocksNode.childNodes[index]
+        blocksNode.removeChild(lastBlock)
+        blocks.pop()
+      },
+      onAdd: index => {
+        blocks.push(false)
+        blocksNode.appendChild(block.view({ 
+          checked: false,
+          onCheck: checked => blocks[index] = checked
+        })) 
+      }
+    }),
+    blocksNode
+  )
+
+  return sequencer
+}