Feat: Auto change percent values in pricestats section

The percent values shown in the price statistics section of the header of the dashboard view now updates according to the time range set.

src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/dashboard/DashBoardView.java

@@ -4,6 +4,7 @@
 import edu.ntnu.idi.idatt2003.g40.mappe.view.ViewElement;
 
 import java.math.BigDecimal;
+import java.math.RoundingMode;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.function.Consumer;
@@ -265,7 +266,18 @@ public void updateGraph(final DashBoardTimeRange timeRange) {
     dataSeries.getData().clear();
     List<BigDecimal> prices = selectedStock.getHistoricalPrices();
 
-    updateStockPrice(prices.getLast().floatValue(), selectedStock.getLatestPriceChange().floatValue());
+    BigDecimal currentPrice = prices.getLast();
+    int rangeInWeeks = timeRange.getWeeks();
+    int startIndex = Math.max(0, prices.size() - 1 - rangeInWeeks);
+
+    BigDecimal pastPrice = prices.get(startIndex);
+    float percentChange;
+    percentChange = currentPrice.subtract(pastPrice)
+            .divide(pastPrice, 4, RoundingMode.HALF_UP)
+            .multiply(new BigDecimal(100))
+            .floatValue();
+
+    updateStockPrice(currentPrice.floatValue(), percentChange);
     setHighPriceLabel(selectedStock.getHighestPrice().floatValue());
     setLowPriceLabel(selectedStock.getLowestPrice().floatValue());
 
@@ -294,18 +306,17 @@ public void updateGraph(final DashBoardTimeRange timeRange) {
   }
 
   private void updateStockPrice(final float value,
-                                final float changeSinceLast) {
+                                final float percentChange) {
     String changeSinceLastString;
-    float changePercent = (value / (value - changeSinceLast) - 1) * 100;
-    if (changeSinceLast > 0) {
-      changeSinceLastString = "(+ " + Math.round(changePercent*100f)/100f + "%)";
-    } else if (changeSinceLast < 0) {
-      changeSinceLastString = "(- " + Math.round(Math.abs(changePercent)*100f)/100f + "%)";
+    if (percentChange > 0) {
+      changeSinceLastString = "(+ " + Math.round(percentChange*100f)/100f + "%)";
+    } else if (percentChange < 0) {
+      changeSinceLastString = "(- " + Math.round(Math.abs(percentChange)*100f)/100f + "%)";
     } else {
       changeSinceLastString = "";
     }
 
-    selectedStockPriceLabel.setText(Float.toString(Math.round(value*100f)/100f) + "NOK " + changeSinceLastString);
+    selectedStockPriceLabel.setText((Math.round(value*100f)/100f) + "NOK " + changeSinceLastString);
   }
 
   private void setLowPriceLabel(float value) {

src/main/resources/styles.css

@@ -355,3 +355,14 @@
 .scroll-pane > .viewport {
     -fx-background-color: transparent;
 }
+
+.combo-box {
+    -fx-background-color: #f4f4f4;
+    -fx-border-color: #d1d1d1;
+    -fx-border-radius: 5;
+    -fx-background-radius: 5;
+}
+
+.combo-box .list-cell {
+    -fx-text-fill: #333333;
+}