highlight element on breadcrumb hover

#WEB-427 fixed

xml/impl/src/com/intellij/xml/breadcrumbs/BreadcrumbsXmlWrapper.java

@@ -16,6 +16,8 @@
 package com.intellij.xml.breadcrumbs;
 
 import com.intellij.application.options.editor.WebEditorOptions;
+import com.intellij.codeInsight.daemon.impl.tagTreeHighlighting.XmlTagTreeHighlightingUtil;
+import com.intellij.codeInsight.highlighting.HighlightManager;
 import com.intellij.ide.ui.UISettings;
 import com.intellij.ide.ui.UISettingsListener;
 import com.intellij.lang.Language;
@@ -25,10 +27,14 @@ import com.intellij.openapi.editor.Document;
 import com.intellij.openapi.editor.Editor;
 import com.intellij.openapi.editor.LogicalPosition;
 import com.intellij.openapi.editor.ScrollType;
+import com.intellij.openapi.editor.colors.EditorColors;
+import com.intellij.openapi.editor.colors.EditorColorsManager;
 import com.intellij.openapi.editor.colors.EditorFontType;
 import com.intellij.openapi.editor.event.CaretAdapter;
 import com.intellij.openapi.editor.event.CaretEvent;
 import com.intellij.openapi.editor.event.CaretListener;
+import com.intellij.openapi.editor.markup.RangeHighlighter;
+import com.intellij.openapi.editor.markup.TextAttributes;
 import com.intellij.openapi.extensions.Extensions;
 import com.intellij.openapi.fileEditor.FileDocumentManager;
 import com.intellij.openapi.project.Project;
@@ -52,10 +58,7 @@ import javax.swing.*;
 import java.awt.*;
 import java.awt.event.ComponentAdapter;
 import java.awt.event.ComponentEvent;
-import java.util.Collection;
-import java.util.Comparator;
-import java.util.LinkedList;
-import java.util.PriorityQueue;
+import java.util.*;
 
 /**
  * @author spleaner
@@ -64,6 +67,7 @@ public class BreadcrumbsXmlWrapper implements BreadcrumbsItemListener<Breadcrumb
   private final BreadcrumbsComponent<BreadcrumbsPsiItem> myComponent;
   private final Project myProject;
   private Editor myEditor;
+  private Collection<RangeHighlighter> myHighlighed;
   private final VirtualFile myFile;
   private boolean myUserCaretChange;
   private final MergingUpdateQueue myQueue;
@@ -383,6 +387,27 @@ public class BreadcrumbsXmlWrapper implements BreadcrumbsItemListener<Breadcrumb
     }
   }
 
+  @Override
+  public void itemHovered(@Nullable BreadcrumbsPsiItem item) {
+    if (myHighlighed != null) {
+      for (RangeHighlighter highlighter : myHighlighed) {
+        HighlightManager.getInstance(myProject).removeSegmentHighlighter(myEditor, highlighter);
+      }
+      myHighlighed = null;
+    }
+    if (item != null) {
+      final TextRange range = item.getPsiElement().getTextRange();
+      final TextAttributes attributes = new TextAttributes();
+      final CrumbPresentation p = item.getPresentation();
+      final Color color = p != null ? p.getBackgroundColor(false, false, false) : BreadcrumbsComponent.ButtonSettings.DEFAULT_BG_COLOR;
+      final Color background = EditorColorsManager.getInstance().getGlobalScheme().getColor(EditorColors.CARET_ROW_COLOR);
+      attributes.setBackgroundColor(XmlTagTreeHighlightingUtil.makeTransparent(color, background, 0.3));
+      myHighlighed = new ArrayList<RangeHighlighter>(1);
+      HighlightManager.getInstance(myProject).addRangeHighlight(myEditor, range.getStartOffset(), range.getEndOffset(),
+                                                                attributes, true, true, myHighlighed);
+    }
+  }
+
   @Nullable
   public static BreadcrumbsXmlWrapper getBreadcrumbsComponent(@NotNull Editor editor) {
     return editor.getUserData(BREADCRUMBS_COMPONENT_KEY);

xml/openapi/src/com/intellij/xml/breadcrumbs/BreadcrumbsComponent.java

@@ -121,6 +121,9 @@ public class BreadcrumbsComponent<T extends BreadcrumbsItem> extends JComponent
     }
 
     myHovered = crumb;
+    for (BreadcrumbsItemListener listener : myListeners) {
+      listener.itemHovered(myHovered != null ? myHovered.myItem : null);
+    }
     repaint();
   }
 

xml/openapi/src/com/intellij/xml/breadcrumbs/BreadcrumbsItemListener.java

@@ -16,12 +16,12 @@
 package com.intellij.xml.breadcrumbs;
 
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * @author spleaner
  */
 public interface BreadcrumbsItemListener<T extends BreadcrumbsItem> {
-
   void itemSelected(@NotNull final T item, final int modifiers);
-
+  void itemHovered(@Nullable final T item);
 }

xml/xml-analysis-impl/src/com/intellij/codeInsight/daemon/impl/tagTreeHighlighting/XmlTagTreeHighlightingUtil.java

@@ -33,7 +33,7 @@ import java.util.Set;
 /**
  * @author Eugene.Kudelevsky
  */
-class XmlTagTreeHighlightingUtil {
+public class XmlTagTreeHighlightingUtil {
   private XmlTagTreeHighlightingUtil() {
   }
 
@@ -76,7 +76,7 @@ class XmlTagTreeHighlightingUtil {
     return false;
   }
 
-  static Color makeTransparent(@NotNull Color color, @NotNull Color backgroundColor, double transparency) {
+  public static Color makeTransparent(@NotNull Color color, @NotNull Color backgroundColor, double transparency) {
     int r = makeTransparent(transparency, color.getRed(), backgroundColor.getRed());
     int g = makeTransparent(transparency, color.getGreen(), backgroundColor.getGreen());
     int b = makeTransparent(transparency, color.getBlue(), backgroundColor.getBlue());