From d40c7d9f09d9b012837d6060a4c598b23b19646f Mon Sep 17 00:00:00 2001
From: Martin Ashby <martin@martin-laptop.lan>
Date: Thu, 17 May 2018 18:18:11 +0100
Subject: Palette, tools, load & save working

---
 src/PaintArea.js | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 src/PaintArea.js

(limited to 'src/PaintArea.js')

diff --git a/src/PaintArea.js b/src/PaintArea.js
new file mode 100644
index 0000000..1ffec83
--- /dev/null
+++ b/src/PaintArea.js
@@ -0,0 +1,74 @@
+import React, { Component } from 'react'
+
+/**
+ * Expects props: 
+ * onTool = (x, y) => {}
+ *  Callback for when a cell is clicked
+ * 
+ * data = [[]]
+ *  3d array - rows, cells, RGB value for each cell
+ */
+export default class PaintArea extends Component {
+  constructor(props) {
+    super(props)
+    this.handleMouseMove = this.handleMouseMove.bind(this)
+    this._onMouseDown = this._onMouseDown.bind(this)
+    this._onMouseUp = this._onMouseUp.bind(this)
+    this.state = {
+      mouseDown: false
+    }
+  }
+
+  _onMouseDown() {
+    this.setState({ mouseDown: true })
+  }
+
+  _onMouseUp() {
+    this.setState({ mouseDown: false })
+  }
+
+  componentWillMount() {
+    document.addEventListener('mousedown', this._onMouseDown)
+    document.addEventListener('mouseup', this._onMouseUp)
+  }
+
+  componentWillUnmount() {
+    document.removeEventListener('mousedown', this._onMouseDown)
+    document.removeEventListener('mouseup', this._onMouseUp)
+  }
+
+  handleMouseMove(x, y) {
+    if (this.state.mouseDown) {
+      this.props.onTool(x, y)
+    }
+  }
+
+  render() {
+    let cells = this.props.data.map((row, iy) => {
+      let rowCells = row.map((cell, ix) => {
+          let r = cell[0]
+          let g = cell[1]
+          let b = cell[2]
+          return <td
+            onMouseMove={() => this.handleMouseMove(ix, iy)}
+            onClick={() => this.props.onTool(ix, iy)}
+            className="paintareacell"
+            style={{
+              background: `rgb(${r},${g},${b})`
+            }}
+            key={(ix * 100000) + iy}/>
+      })
+      return <tr key={iy}>{rowCells}</tr>
+    })
+    
+    return (
+      <table 
+        className="paintarea"
+        draggable={false}>
+        <tbody>
+          {cells}
+        </tbody>
+      </table>
+    )
+  }
+}
\ No newline at end of file
-- 
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