1 files changed, 213 insertions, 0 deletions
diff --git a/animism-align/frontend/app/views/media/components/media.formImageSelection.js b/animism-align/frontend/app/views/media/components/media.formImageSelection.js
new file mode 100644
index 0000000..966eb58
--- /dev/null
+++ b/animism-align/frontend/app/views/media/components/media.formImageSelection.js
@@ -0,0 +1,213 @@
+import React, { Component } from 'react'
+import { Link } from 'react-router-dom'
+import { bindActionCreators } from 'redux'
+import { connect } from 'react-redux'
+import toBlob from 'data-uri-to-blob'
+
+import { clamp } from 'app/utils'
+import { Loader } from 'app/common'
+
+const defaultState = {
+  dragging: false,
+  draggingBox: false,
+  bounds: null,
+  mouseX: 0,
+  mouseY: 0,
+  box: {
+    x: 0,
+    y: 0,
+    w: 0,
+    h: 0,
+  }
+}
+
+export default class ImageSelection extends Component {
+  state = {
+    ...defaultState
+  }
+
+  constructor() {
+    super()
+    // bind these events in the constructor, so we can remove event listeners later
+    this.handleMouseDown = this.handleMouseDown.bind(this)
+    this.handleMouseDownOnBox = this.handleMouseDownOnBox.bind(this)
+    this.handleMouseMove = this.handleMouseMove.bind(this)
+    this.handleMouseUp = this.handleMouseUp.bind(this)
+    this.handleWindowResize = this.handleWindowResize.bind(this)
+  }
+
+  componentDidMount() {
+    document.body.addEventListener('mousemove', this.handleMouseMove)
+    document.body.addEventListener('mouseup', this.handleMouseUp)
+    window.addEventListener('resize', this.handleWindowResize)
+  }
+
+  componentDidUpdate(prevProps) {
+    if (this.state.bounds && this.props.url !== prevProps.url) {
+      this.setState({
+        ...defaultState,
+        bounds: this.getBoundingClientRect(),
+        box: this.props.crop || defaultState.box,
+      })
+    }
+  }
+
+  componentWillUnmount() {
+    document.body.removeEventListener('mousemove', this.handleMouseMove)
+    document.body.removeEventListener('mouseup', this.handleMouseUp)
+    window.removeEventListener('resize', this.handleWindowResize)
+  }
+
+  getBoundingClientRect() {
+    if (!this.imgRef) return null
+    const rect = this.imgRef.getBoundingClientRect()
+    const scrollTop = document.body.scrollTop || document.body.parentNode.scrollTop
+    const scrollLeft = document.body.scrollLeft || document.body.parentNode.scrollLeft
+    const bounds = {
+      top: rect.top + scrollTop,
+      left: rect.left + scrollLeft,
+      width: rect.width,
+      height: rect.height,
+    }
+    return bounds
+  }
+
+  handleLoad() {
+    const bounds = this.getBoundingClientRect()
+    const box = this.props.crop || defaultState.box
+    this.setState({ bounds, box })
+  }
+
+  handleWindowResize() {
+    if (!this.imgRef) return
+    const bounds = this.getBoundingClientRect()
+    this.setState({ bounds })
+  }
+
+  handleMouseDown(e) {
+    e.preventDefault()
+    const bounds = this.getBoundingClientRect()
+    const mouseX = e.pageX
+    const mouseY = e.pageY
+    const x = (mouseX - bounds.left) / bounds.width
+    const y = (mouseY - bounds.top) / bounds.height
+    const w = 1 / bounds.width
+    const h = 1 / bounds.height
+    this.setState({
+      dragging: true,
+      bounds,
+      mouseX,
+      mouseY,
+      box: {
+        x, y, w, h,
+      }
+    })
+  }
+
+  handleMouseDownOnBox(e) {
+    const bounds = this.getBoundingClientRect()
+    const mouseX = e.pageX
+    const mouseY = e.pageY
+    this.setState({
+      draggingBox: true,
+      bounds,
+      mouseX,
+      mouseY,
+      initialBox: {
+        ...this.state.box
+      },
+      box: {
+        ...this.state.box
+      }
+    })
+  }
+
+  handleMouseMove(e) {
+    const {
+      dragging, draggingBox,
+      bounds, mouseX, mouseY, initialBox, box
+    } = this.state
+    if (dragging) {
+      e.preventDefault()
+      let { x, y } = box
+      let dx = (e.pageX - mouseX) / bounds.width
+      let dy = (e.pageY - mouseY) / bounds.height
+      let w = clamp(dx, 0.0, 1.0 - x)
+      let h = clamp(dy, 0.0, 1.0 - y)
+      this.setState({
+        box: {
+          x, y, w, h,
+        }
+      })
+    } else if (draggingBox) {
+      e.preventDefault()
+      let { x, y, w, h } = initialBox
+      let dx = (e.pageX - mouseX) / bounds.width
+      let dy = (e.pageY - mouseY) / bounds.height
+      this.setState({
+        box: {
+          x: clamp(x + dx, 0, 1.0 - w),
+          y: clamp(y + dy, 0, 1.0 - h),
+          w,
+          h,
+        }
+      })
+    }
+  }
+
+  handleMouseUp(e) {
+    const { onCrop } = this.props
+    const { dragging, draggingBox, bounds, box } = this.state
+    if (!dragging && !draggingBox) return
+    e.preventDefault()
+    const { x, y, w, h } = box
+    let url = window.location.pathname
+    this.setState({
+      dragging: false,
+      draggingBox: false,
+    })
+    if (w < 10 / bounds.width || h < 10 / bounds.height) {
+      this.setState({ box: { ...defaultState.box }})
+      onCrop({})
+    } else {
+      // pass the box dimensions up - do the search again
+      onCrop(box)
+    }
+  }
+
+  render() {
+    const { url } = this.props
+    const { bounds, box } = this.state
+    const { x, y, w, h } = box
+    return (
+      <div className="imageSelection">
+        <img
+          src={url}
+          ref={ref => this.imgRef = ref}
+          onMouseDown={this.handleMouseDown}
+          onLoad={this.handleLoad.bind(this)}
+          crossOrigin='anonymous'
+        />
+        {!!w &&
+          <div
+            className="box"
+            style={{
+              left: x * bounds.width,
+              top: y * bounds.height,
+              width: w * bounds.width,
+              height: h * bounds.height,
+            }}
+            onMouseDown={this.handleMouseDownOnBox}
+          />
+        }
+      </div>
+    )
+  }
+}
+
+const boxToFixed = ({ x, y, w, h }) => ({
+  x: x.toFixed(3),
+  y: y.toFixed(3),
+  w: w.toFixed(3),
+  h: h.toFixed(3),
+})