New UI for Find command: find-as-you-type.

editor/tools/plugins/com.xored.glance.ui/src/com/xored/glance/ui/utils/TextUtils.java

Index: editor/tools/plugins/com.xored.glance.ui/src/com/xored/glance/ui/utils/TextUtils.java
===================================================================
--- editor/tools/plugins/com.xored.glance.ui/src/com/xored/glance/ui/utils/TextUtils.java	(revision 0)
+++ editor/tools/plugins/com.xored.glance.ui/src/com/xored/glance/ui/utils/TextUtils.java	(revision 0)
@@ -0,0 +1,100 @@
+/**
+ * 
+ */
+package com.xored.glance.ui.utils;
+
+import java.util.Arrays;
+import java.util.Iterator;
+
+import org.eclipse.jface.text.IRegion;
+import org.eclipse.jface.text.TextPresentation;
+import org.eclipse.swt.custom.StyleRange;
+import org.eclipse.swt.graphics.Color;
+
+import com.xored.glance.ui.sources.ColorManager;
+import com.xored.glance.ui.sources.Match;
+
+/**
+ * @author Yuri Strot
+ */
+public class TextUtils {
+
+  public static StyleRange[] copy(final StyleRange[] ranges) {
+    final StyleRange[] result = new StyleRange[ranges.length];
+    for (int i = 0; i < result.length; i++) {
+      result[i] = copy(ranges[i]);
+    }
+    return result;
+  }
+
+  public static StyleRange copy(final StyleRange range) {
+    final StyleRange result = new StyleRange(range);
+    result.start = range.start;
+    result.length = range.length;
+    result.fontStyle = range.fontStyle;
+    return result;
+  }
+
+  public static StyleRange[] getStyles(final TextPresentation presentation) {
+    final StyleRange[] ranges = new StyleRange[presentation.getDenumerableRanges()];
+    final Iterator<?> e = presentation.getAllStyleRangeIterator();
+    for (int i = 0; e.hasNext(); i++) {
+      ranges[i] = (StyleRange) e.next();
+    }
+    return ranges;
+  }
+
+  public static void applyStyles(final TextPresentation presentation, final Match[] matches,
+      final Match selected) {
+
+    final StyleRange[] ranges = createStyleRanges(presentation.getExtent(), matches,
+        ColorManager.getInstance().getBackgroundColor());
+
+    presentation.mergeStyleRanges(ranges);
+
+    if (selected != null) {
+      final StyleRange[] selectedRanges = createStyleRanges(presentation.getExtent(),
+          new Match[] {selected}, ColorManager.getInstance().getSelectedBackgroundColor());
+      presentation.mergeStyleRanges(selectedRanges);
+
+    }
+  }
+
+  private static StyleRange[] createStyleRanges(final IRegion region, final Match[] matches,
+      final Color color) {
+    final Match[] regionMatches = getRangeMatches(region.getOffset(), region.getLength(), matches);
+    final StyleRange[] ranges = new StyleRange[regionMatches.length];
+    for (int i = 0; i < regionMatches.length; i++) {
+      final StyleRange range = new StyleRange(regionMatches[i].getOffset(),
+          regionMatches[i].getLength(), null, color);
+      ranges[i] = range;
+    }
+    return ranges;
+  }
+
+  private static Match[] getRangeMatches(final int start, final int length, final Match[] matches) {
+    int from = getPosition(start, matches);
+    if (from >= matches.length)
+      return Match.EMPTY;
+    if (from > 0) {
+      final Match border = matches[from - 1];
+      if (border.getLength() + border.getOffset() > start)
+        from--;
+    }
+    final int to = getPosition(start + length, matches) - 1;
+    if (from <= to) {
+      final Match[] result = new Match[to - from + 1];
+      System.arraycopy(matches, from, result, 0, result.length);
+      return result;
+    }
+    return Match.EMPTY;
+  }
+
+  private static int getPosition(final int offset, final Match[] matches) {
+    final int index = Arrays.binarySearch(matches, new Match(null, offset, 0));
+    if (index >= 0)
+      return index;
+    return -index - 1;
+  }
+
+}