1 files changed, 75 insertions, 0 deletions
diff --git a/opendc-web/opendc-web-ui/src/components/app/map/layers/HoverLayerComponent.js b/opendc-web/opendc-web-ui/src/components/app/map/layers/HoverLayerComponent.js
new file mode 100644
index 00000000..bead87de
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/components/app/map/layers/HoverLayerComponent.js
@@ -0,0 +1,75 @@
+import PropTypes from 'prop-types'
+import React from 'react'
+import { Layer } from 'react-konva'
+import HoverTile from '../elements/HoverTile'
+import { TILE_SIZE_IN_PIXELS } from '../MapConstants'
+
+class HoverLayerComponent extends React.Component {
+    static propTypes = {
+        mouseX: PropTypes.number.isRequired,
+        mouseY: PropTypes.number.isRequired,
+        mapPosition: PropTypes.object.isRequired,
+        mapScale: PropTypes.number.isRequired,
+        isEnabled: PropTypes.func.isRequired,
+        onClick: PropTypes.func.isRequired,
+    }
+
+    state = {
+        positionX: -1,
+        positionY: -1,
+        validity: false,
+    }
+
+    componentDidUpdate() {
+        if (!this.props.isEnabled()) {
+            return
+        }
+
+        const positionX = Math.floor(
+            (this.props.mouseX - this.props.mapPosition.x) / (this.props.mapScale * TILE_SIZE_IN_PIXELS)
+        )
+        const positionY = Math.floor(
+            (this.props.mouseY - this.props.mapPosition.y) / (this.props.mapScale * TILE_SIZE_IN_PIXELS)
+        )
+
+        if (positionX !== this.state.positionX || positionY !== this.state.positionY) {
+            this.setState({
+                positionX,
+                positionY,
+                validity: this.props.isValid(positionX, positionY),
+            })
+        }
+    }
+
+    render() {
+        if (!this.props.isEnabled()) {
+            return <Layer />
+        }
+
+        const pixelX = this.props.mapScale * this.state.positionX * TILE_SIZE_IN_PIXELS + this.props.mapPosition.x
+        const pixelY = this.props.mapScale * this.state.positionY * TILE_SIZE_IN_PIXELS + this.props.mapPosition.y
+
+        return (
+            <Layer opacity={0.6}>
+                <HoverTile
+                    pixelX={pixelX}
+                    pixelY={pixelY}
+                    scale={this.props.mapScale}
+                    isValid={this.state.validity}
+                    onClick={() =>
+                        this.state.validity ? this.props.onClick(this.state.positionX, this.state.positionY) : undefined
+                    }
+                />
+                {this.props.children
+                    ? React.cloneElement(this.props.children, {
+                          pixelX,
+                          pixelY,
+                          scale: this.props.mapScale,
+                      })
+                    : undefined}
+            </Layer>
+        )
+    }
+}
+
+export default HoverLayerComponent