Qt: Validate FindLineEdit regexp

Check if regexp is valid and set valid/invalid background color.

Change-Id: Ibf4d3fa84463afbd7c68631cfaddec8261807b8f
Reviewed-on: https://code.wireshark.org/review/13962
Petri-Dish: Stig Bjørlykke <stig@bjorlykke.org>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Stig Bjørlykke <stig@bjorlykke.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/ui/qt/find_line_edit.cpp b/ui/qt/find_line_edit.cpp
index 94d351033b..9ecf0235d7 100644
--- a/ui/qt/find_line_edit.cpp
+++ b/ui/qt/find_line_edit.cpp
@@ -20,6 +20,8 @@
  */
 
 #include "find_line_edit.h"
+#include "color_utils.h"
+#include "epan/prefs.h"
 
 #include <QAction>
 #include <QKeyEvent>
@@ -49,15 +51,42 @@ void FindLineEdit::contextMenuEvent(QContextMenuEvent *event)
     delete menu;
 }
 
+void FindLineEdit::keyPressEvent(QKeyEvent *event)
+{
+    QLineEdit::keyPressEvent(event);
+
+    if (use_regex_) {
+        validateText();
+    }
+}
+
+void FindLineEdit::validateText()
+{
+    QString style("QLineEdit { background-color: %1; }");
+
+    if (!use_regex_ || text().isEmpty()) {
+        setStyleSheet(style.arg(QString("")));
+    } else {
+        QRegExp regexp(text());
+        if (regexp.isValid()) {
+            setStyleSheet(style.arg(ColorUtils::fromColorT(prefs.gui_text_valid).name()));
+        } else {
+            setStyleSheet(style.arg(ColorUtils::fromColorT(prefs.gui_text_invalid).name()));
+        }
+    }
+}
+
 void FindLineEdit::setUseTextual()
 {
     use_regex_ = false;
+    validateText();
     emit useRegexFind(use_regex_);
 }
 
 void FindLineEdit::setUseRegex()
 {
     use_regex_ = true;
+    validateText();
     emit useRegexFind(use_regex_);
 }