optimizations with better legend placement (CONTROLGUI-403)

src/main/java/fr/soleil/comete/bean/trend/view/ChartPanel.java

 package fr.soleil.comete.bean.trend.view;
 
 import java.awt.BorderLayout;
+import java.awt.Dimension;
 import java.awt.Window;
 import java.io.File;
 import java.util.Collection;
@@ -281,6 +282,8 @@ public class ChartPanel extends JPanel implements ITrendFileListener, IChartView
 
         public TrendChart() {
             super();
+            // Don't update data map on data file loading (CONTROLGUI-403)
+            setUpdateDataMapWithFileLoading(false);
         }
 
         public String getSettingsDirectory() {
@@ -294,7 +297,7 @@ public class ChartPanel extends JPanel implements ITrendFileListener, IChartView
         }
 
         public boolean hasData(String id) {
-            return (id != null) && data.containsKey(id);
+            return (id != null) && (getDataView(id, false) != null);
         }
 
         public boolean isSamplingEnabled() {
@@ -314,6 +317,10 @@ public class ChartPanel extends JPanel implements ITrendFileListener, IChartView
 
         protected void doApplyConfiguration(CfFileReader f) {
             super.applyConfiguration(f);
+            SwingUtilities.invokeLater(() -> {
+                refresh(false);
+                repaint();
+            });
         }
 
         @Override
@@ -356,6 +363,37 @@ public class ChartPanel extends JPanel implements ITrendFileListener, IChartView
                     doApplyConfiguration(configurationReader);
                     configurationReader = null;
                 }
+                if (isLegendVisible() && (chartLegend != null) && (chartSplitPane != null)) {
+                    // Update legend placement (CONTROLGUI-403)
+                    final int placement = getLabelPlacement(), width = getWidth(), height = getHeight();
+                    final int div = chartSplitPane.getDividerSize();
+                    final int minViewSize = 100, margin = 5;
+                    final Dimension size = chartLegend.getPreferredSize();
+                    switch (placement) {
+                        case LABEL_LEFT:
+                            if (width >= size.width + margin + div + minViewSize) {
+                                chartSplitPane.setDividerLocation(size.width + margin);
+                                repaint();
+                            }
+                            break;
+                        case LABEL_RIGHT:
+                            if (width >= size.width + margin + div + minViewSize) {
+                                chartSplitPane.setDividerLocation(width - (size.width + margin + div));
+                                repaint();
+                            }
+                            break;
+                        case LABEL_UP:
+                            if (height >= size.height + margin + div + minViewSize) {
+                                chartSplitPane.setDividerLocation(size.height + margin);
+                            }
+                            break;
+                        default:
+                            if (height >= size.height + margin + div + minViewSize) {
+                                chartSplitPane.setDividerLocation(height - (size.height + margin + div));
+                            }
+                            break;
+                    }
+                }
             });
             super.finalActionOnceDataLoaded();
         }