From cc0d264791d7e9ebd996cac23894f00c9355a2d6 Mon Sep 17 00:00:00 2001
From: Christian Schneppe <christian@pix-art.de>
Date: Wed, 2 May 2018 20:59:08 +0200
Subject: highlight search term in search results

---
 .../de/pixart/messenger/utils/StylingHelper.java   | 43 ++++++++++++++++++++++
 1 file changed, 43 insertions(+)

(limited to 'src/main/java/de/pixart/messenger/utils')

diff --git a/src/main/java/de/pixart/messenger/utils/StylingHelper.java b/src/main/java/de/pixart/messenger/utils/StylingHelper.java
index 1f553b827..21e074603 100644
--- a/src/main/java/de/pixart/messenger/utils/StylingHelper.java
+++ b/src/main/java/de/pixart/messenger/utils/StylingHelper.java
@@ -29,22 +29,28 @@
 
 package de.pixart.messenger.utils;
 
+import android.content.Context;
 import android.graphics.Color;
 import android.graphics.Typeface;
 import android.support.annotation.ColorInt;
+import android.support.v4.content.ContextCompat;
 import android.text.Editable;
 import android.text.ParcelableSpan;
+import android.text.SpannableString;
 import android.text.Spanned;
 import android.text.TextWatcher;
+import android.text.style.BackgroundColorSpan;
 import android.text.style.ForegroundColorSpan;
 import android.text.style.StrikethroughSpan;
 import android.text.style.StyleSpan;
 import android.text.style.TypefaceSpan;
 import android.widget.EditText;
+import android.widget.TextView;
 
 import java.util.Arrays;
 import java.util.List;
 
+import de.pixart.messenger.R;
 import de.pixart.messenger.entities.Message;
 import de.pixart.messenger.ui.text.QuoteSpan;
 
@@ -85,6 +91,24 @@ public class StylingHelper {
         format(editable, end, editable.length() - 1, textColor);
     }
 
+    public static void highlight(final Context context, final Editable editable, String needle, boolean dark) {
+        final int length = needle.length();
+        String string = editable.toString();
+        int start = indexOfIgnoreCase(string, needle, 0);
+        while (start != -1) {
+            int end = start + length;
+            editable.setSpan(new BackgroundColorSpan(ContextCompat.getColor(context, dark ? R.color.deep_purple_a100 : R.color.deep_purple_a200)), start, end, SpannableString.SPAN_EXCLUSIVE_EXCLUSIVE);
+            editable.setSpan(new ForegroundColorSpan(ContextCompat.getColor(context, dark ? R.color.black87 : R.color.white)), start, end, SpannableString.SPAN_EXCLUSIVE_EXCLUSIVE);
+            start = indexOfIgnoreCase(string, needle, start + length);
+        }
+
+    }
+
+    public static boolean isDarkText(TextView textView) {
+        int argb = textView.getCurrentTextColor();
+        return Color.red(argb) + Color.green(argb) + Color.blue(argb) == 0;
+    }
+
     private static ParcelableSpan createSpanForStyle(ImStyleParser.Style style) {
         switch (style.getKeyword()) {
             case "*":
@@ -114,6 +138,25 @@ public class StylingHelper {
         return Color.argb(Math.round(Color.alpha(c) * 0.6f), Color.red(c), Color.green(c), Color.blue(c));
     }
 
+    private static int indexOfIgnoreCase(final String haystack, final String needle, final int start) {
+        if (haystack == null || needle == null) {
+            return -1;
+        }
+        final int endLimit = haystack.length() - needle.length() + 1;
+        if (start > endLimit) {
+            return -1;
+        }
+        if (needle.length() == 0) {
+            return start;
+        }
+        for (int i = start; i < endLimit; i++) {
+            if (haystack.regionMatches(true, i, needle, 0, needle.length())) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
     public static class MessageEditorStyler implements TextWatcher {
 
         private final EditText mEditText;
-- 
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