Fix left right buttons

src/common.mjs

@@ -26,6 +26,8 @@ const removeCommas = (input) => {
 // or
 // { contig, start, distance }
 //
+// a region string could look like: "17:1-100"
+// 
 // For distance, + is used as the coordinate separator. For start/end ranges, - is used.
 // The coordinates are set off from the contig by the last colon.
 // Commas in coordinates are removed.

src/components/DataPositionFormRow.js

@@ -84,6 +84,7 @@ class DataPositionFormRow extends Component {
           color="primary"
           id="goLeftButton"
           onClick={this.props.handleGoLeft}
+          disabled={this.props.uploadInProgress || !this.props.canGoLeft}
         >
           <FontAwesomeIcon icon={faStepBackward} size="lg" />
         </Button>
@@ -97,6 +98,7 @@ class DataPositionFormRow extends Component {
           color="primary"
           id="goRightButton"
           onClick={this.props.handleGoRight}
+          disabled={this.props.uploadInProgress || !this.props.canGoRight}
         >
           <FontAwesomeIcon icon={faStepForward} size="lg" />
         </Button>
@@ -125,6 +127,8 @@ DataPositionFormRow.propTypes = {
   uploadInProgress: PropTypes.bool.isRequired,
   getCurrentViewTarget: PropTypes.func.isRequired,
   viewTargetHasChange: PropTypes.bool.isRequired,
+  canGoLeft: PropTypes.bool.isRequired,
+  canGoRight: PropTypes.bool.isRequired,
 };
 
 export default DataPositionFormRow;

src/components/HeaderForm.js

@@ -44,8 +44,25 @@ const CLEAR_STATE = {
   // Description for the selected region, is not displayed when empty
   desc: "",
 
-  // This tracks several arrays of BED region data, stored by data type, with
+  // This tracks several arrays (desc, chr, start, end) of BED region data, with
   // one entry in each array per region.
+  // desc: description of region, i.e. "region with no source graph available"
+  // chr: path in graph where the region is on, i.e. in ref:2000-3000, "ref" is the chr
+  // start: start of the region, i.e. in ref:2000-3000, 2000 is the start
+  // end: end of the region, i.e. in ref:2000-3000, 3000 is the end
+  // chunk: url/directory for preexisting cached chunk, or empty string if not available
+  // tracks: object full of tracks to apply when user selects region, or null
+  // so regionInfo might look like: 
+  /*
+  {
+    chr: [ '17', '17' ],
+    start: [ '1', '1000' ],
+    end: [ '100', '1200' ],
+    desc: [ '17_1_100', '17_1000_1200' ],
+    chunk: [ '', '' ],
+    tracks: [ null, null ]
+  }
+  */
   regionInfo: {},
 
   pathNames: [],
@@ -171,6 +188,77 @@ function viewTargetsEqual(currViewTarget, nextViewTarget) {
   return true;
 }
 
+/* determine the current region: accepts a region string and returns the region index
+
+  example of regionInfo:
+  {
+    chr: [ '17', '17' ],
+    start: [ '1', '1000' ],
+    end: [ '100', '1200' ],
+    desc: [ '17_1_100', '17_1000_1200' ],
+    chunk: [ '', '' ],
+    tracks: [ null, null ]
+  }
+
+  examples: 
+  if the regionString is "17:1-100", it would be parsed into {contig: "17", start: 1, end: 100} -> 0
+  if the regionString is "17:1000-1200", it would be parsed into {contig: "17", start: 1000, end: 1200} -> 1
+  if the regionString is "17:2000-3000", it cannot be found - return null
+
+  The function uses this approach to find the regionIndex given regionString and regionInfo:
+  function (region string){
+    parse(region string) -> return {contig, start, end}
+    loop over chr in region info
+      determine if contig, start, end are present at the current index
+      if present: return index
+    return null
+  }
+*/
+export const determineRegionIndex = (regionString, regionInfo) => {
+  let parsedRegion;
+  try {
+    parsedRegion = parseRegion(regionString);
+  } catch(error) {
+    return null;
+  }
+  if (!regionInfo["chr"]){
+    return null;
+  }
+  for (let i = 0; i < regionInfo["chr"].length; i++){
+    if ((parseInt(regionInfo["start"][i]) === parsedRegion.start) 
+        && (parseInt(regionInfo["end"][i]) === parsedRegion.end)
+        && (regionInfo["chr"][i] === parsedRegion.contig)){
+          return i;
+    }
+  }
+  return null;
+}
+
+/*
+  This function takes in a regionIndex and regionInfo, and reconstructs a regionString from them
+  assumes that index is valid in regionInfo
+
+  example of regionInfo:
+  {
+    chr: [ '17', '17' ],
+    start: [ '1', '1000' ],
+    end: [ '100', '1200' ],
+    desc: [ '17_1_100', '17_1000_1200' ],
+    chunk: [ '', '' ],
+    tracks: [ null, null ]
+  }
+
+  example of regionIndex: 0
+
+  example of regionString: "17:1-100"
+*/
+export const regionStringFromRegionIndex = (regionIndex, regionInfo) => {
+  let regionStart = regionInfo["start"][regionIndex];
+  let regionEnd = regionInfo["end"][regionIndex];
+  let regionContig = regionInfo["chr"][regionIndex];
+  return regionContig + ":" + regionStart + "-" + regionEnd;
+}
+
 class HeaderForm extends Component {
   state = EMPTY_STATE;
   componentDidMount() {
@@ -504,6 +592,9 @@ class HeaderForm extends Component {
     return regionString;
   };
 
+
+
+
   // In addition to a new region value, also takes tracks and chunk associated with the region
   // Update current track if the new tracks are valid
   // Otherwise check if the current bed file is a url, and if tracks can be fetched from said url
@@ -627,12 +718,57 @@ class HeaderForm extends Component {
     );
   }
 
+
+  /* Offset the region left or right by the given negative or positive fraction*/
+  // offset: +1 or -1
+  jumpRegion(offset) {
+    let regionIndex = determineRegionIndex(this.state.region, this.state.regionInfo) ?? 0;
+    if ((offset === -1 && this.canGoLeft(regionIndex)) || (offset === 1 && this.canGoRight(regionIndex))){
+      regionIndex += offset;
+    }
+    let regionString = regionStringFromRegionIndex(regionIndex, this.state.regionInfo);
+    this.setState(
+      (state) => ({
+        region: regionString,
+      }),
+      () => this.handleGoButton()
+    );
+  }
+
+  canGoLeft = (regionIndex) => {
+    if (this.state.bedFile){
+      return (regionIndex > 0);
+    } else {
+      return true;
+    }
+  }
+
+  canGoRight = (regionIndex) => {
+    if (this.state.bedFile){
+      if (!this.state.regionInfo["chr"]){
+        return false;
+      }
+      return (regionIndex < ((this.state.regionInfo["chr"].length) - 1));
+    } else {
+      return true;
+    }
+  }
+
+
   handleGoRight = () => {
-    this.budgeRegion(0.5);
+    if (this.state.bedFile){
+      this.jumpRegion(1);
+    } else {
+      this.budgeRegion(0.5);
+    }
   };
 
   handleGoLeft = () => {
-    this.budgeRegion(-0.5);
+    if (this.state.bedFile){
+      this.jumpRegion(-1);
+    } else {
+      this.budgeRegion(-0.5);
+    }
   };
 
   showFileSizeAlert = () => {
@@ -736,9 +872,13 @@ class HeaderForm extends Component {
         uploadInProgress={this.state.uploadInProgress}
         getCurrentViewTarget={this.props.getCurrentViewTarget}
         viewTargetHasChange={viewTargetHasChange}
+        canGoLeft={this.canGoLeft(determineRegionIndex(this.state.region, this.state.regionInfo))}
+        canGoRight={this.canGoRight(determineRegionIndex(this.state.region, this.state.regionInfo))}
       />
     );
 
+
+
     return (
       <div>
         <Container>

src/components/HeaderForm.test.js

@@ -0,0 +1,64 @@
+import { determineRegionIndex, regionStringFromRegionIndex } from "./HeaderForm.js";
+
+
+// test for determineRegionIndex and regionStringFromRegionIndex
+describe("determine regionIndex and corresponding region strings for various region inputs", () => {
+  // TEST #1
+  it("determine regionIndex and regionString for smaller regionInfo lists", async () => {
+    let regionInfo = {
+      chr: [ 'ref', 'ref' ],
+      start: [ '1000', '2000' ],
+      end: [ '2000', '3000' ],
+      desc: [ '17_1_100', 'ref_2000_3000' ],
+      chunk: [ '', '' ],
+      tracks: [ null, null ]
+    }
+    let regionString = "ref:2000-3000";
+    let regionIndex = determineRegionIndex(regionString, regionInfo);
+    expect(regionIndex).toBe(1);
+    expect(regionStringFromRegionIndex(regionIndex, regionInfo)).toBe("ref:2000-3000");
+  })
+  // TEST #2
+  it("determine regionIndex and regionString for larger regionInfo lists", async () => {
+    let regionInfo = {
+      chr: [ '17', 'ref', '17', 'ref', '17', 'ref' ],
+      start: [ '100', '200', '2000', '3000', '4000', '5000' ],
+      end: [ '200', '300', '3000', '4000', '5000', '6000' ],
+      desc: [ '17_100_200', '17_200_300', 'ref_2000_3000', 'ref_3000_4000', 'ref_4000_5000', 'ref_5000_6000' ],
+      chunk: [ '', '', '', '', '', '', '' ],
+      tracks: [ null, null, null, null, null, null ]
+    }
+    let regionString = "17:4000-5000";
+    let regionIndex = determineRegionIndex(regionString, regionInfo);
+    expect(regionIndex).toBe(4);
+    expect(regionStringFromRegionIndex(regionIndex, regionInfo)).toBe("17:4000-5000");
+  })
+  // TEST #3
+  it("determine regionIndex to be null for input of region not found in regionInfo", async () => {
+    let regionInfo = {
+      chr: [ '17', 'ref', '17', 'ref', '17', 'ref' ],
+      start: [ '100', '200', '2000', '3000', '4000', '5000' ],
+      end: [ '200', '300', '3000', '4000', '5000', '6000' ],
+      desc: [ '17_100_200', '17_200_300', 'ref_2000_3000', 'ref_3000_4000', 'ref_4000_5000', 'ref_5000_6000' ],
+      chunk: [ '', '', '', '', '', '', '' ],
+      tracks: [ null, null, null, null, null, null ]
+    }
+    let regionString = "17:5000-7000";
+    let regionIndex = determineRegionIndex(regionString, regionInfo);
+    expect(regionIndex).toBe(null);
+  })
+  // TEST #4
+  it("determine regionIndex and regionString to be null given empty regionInfo", async () => {
+    let regionInfo = {
+      chr: [],
+      start: [],
+      end: [],
+      desc: [],
+      chunk: [],
+      tracks: []
+    }
+    let regionString = "17:5000-7000";
+    let regionIndex = determineRegionIndex(regionString, regionInfo);
+    expect(regionIndex).toBe(null);
+  })
+});