From 4b943c42fd50aa566af6c7891fe1ff55c101a69d Mon Sep 17 00:00:00 2001
From: Luke Dashjr <luke-jr+git@utopios.org>
Date: Tue, 7 May 2019 12:26:12 +0000
Subject: [PATCH] GUI: QValidatedLineEdit: Add support for a warning-but-valid
 state

---
 src/qt/guiconstants.h         |  2 ++
 src/qt/qvalidatedlineedit.cpp | 48 +++++++++++++++++++++++++++++++----
 src/qt/qvalidatedlineedit.h   |  8 +++++-
 3 files changed, 52 insertions(+), 6 deletions(-)

diff --git a/src/qt/guiconstants.h b/src/qt/guiconstants.h
index 0386689baf..fc689674c4 100644
--- a/src/qt/guiconstants.h
+++ b/src/qt/guiconstants.h
@@ -26,6 +26,8 @@ static const bool DEFAULT_SPLASHSCREEN = true;
 
 /* Invalid field background style */
 #define STYLE_INVALID "border: 3px solid #FF8080"
+/* "Warning" field background style */
+#define STYLE_INCORRECT "border: 3px solid #FFFF80"
 
 /* Transaction list -- unconfirmed transaction */
 #define COLOR_UNCONFIRMED QColor(128, 128, 128)
diff --git a/src/qt/qvalidatedlineedit.cpp b/src/qt/qvalidatedlineedit.cpp
index b646332001..d90ff5526e 100644
--- a/src/qt/qvalidatedlineedit.cpp
+++ b/src/qt/qvalidatedlineedit.cpp
@@ -13,22 +13,34 @@ QValidatedLineEdit::QValidatedLineEdit(QWidget* parent)
     connect(this, &QValidatedLineEdit::textChanged, this, &QValidatedLineEdit::markValid);
 }
 
+QValidatedLineEdit::~QValidatedLineEdit()
+{
+    delete m_warning_validator;
+}
+
 void QValidatedLineEdit::setText(const QString& text)
 {
     QLineEdit::setText(text);
     checkValidity();
 }
 
-void QValidatedLineEdit::setValid(bool _valid)
+void QValidatedLineEdit::setValid(bool _valid, bool with_warning)
 {
     if(_valid == this->valid)
     {
-        return;
+        if (with_warning == m_has_warning || !valid) {
+            return;
+        }
     }
 
     if(_valid)
     {
-        setStyleSheet("");
+        m_has_warning = with_warning;
+        if (with_warning) {
+            setStyleSheet("QValidatedLineEdit { " STYLE_INCORRECT "}");
+        } else {
+            setStyleSheet("");
+        }
     }
     else
     {
@@ -82,13 +94,14 @@ void QValidatedLineEdit::setEnabled(bool enabled)
 
 void QValidatedLineEdit::checkValidity()
 {
+    const bool has_warning = checkWarning();
     if (text().isEmpty())
     {
         setValid(true);
     }
     else if (hasAcceptableInput())
     {
-        setValid(true);
+        setValid(true, has_warning);
 
         // Check contents on focus out
         if (checkValidator)
@@ -96,7 +109,7 @@ void QValidatedLineEdit::checkValidity()
             QString address = text();
             int pos = 0;
             if (checkValidator->validate(address, pos) == QValidator::Acceptable)
-                setValid(true);
+                setValid(true, has_warning);
             else
                 setValid(false);
         }
@@ -126,3 +139,28 @@ bool QValidatedLineEdit::isValid()
 
     return valid;
 }
+
+void QValidatedLineEdit::setWarningValidator(const QValidator *v)
+{
+    delete m_warning_validator;
+    m_warning_validator = v;
+    checkValidity();
+}
+
+bool QValidatedLineEdit::checkWarning() const
+{
+    if (m_warning_validator && !text().isEmpty()) {
+        QString address = text();
+        int pos = 0;
+        if (m_warning_validator->validate(address, pos) != QValidator::Acceptable) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+bool QValidatedLineEdit::hasWarning() const
+{
+    return m_has_warning;
+}
diff --git a/src/qt/qvalidatedlineedit.h b/src/qt/qvalidatedlineedit.h
index b1ae013957..a695435a0b 100644
--- a/src/qt/qvalidatedlineedit.h
+++ b/src/qt/qvalidatedlineedit.h
@@ -16,9 +16,12 @@ class QValidatedLineEdit : public QLineEdit
 
 public:
     explicit QValidatedLineEdit(QWidget *parent);
+    ~QValidatedLineEdit();
     void clear();
     void setCheckValidator(const QValidator *v);
     bool isValid();
+    void setWarningValidator(const QValidator *);
+    bool hasWarning() const;
 
 protected:
     void focusInEvent(QFocusEvent *evt) override;
@@ -27,10 +30,12 @@ protected:
 private:
     bool valid{true};
     const QValidator* checkValidator{nullptr};
+    bool m_has_warning{false};
+    const QValidator *m_warning_validator{nullptr};
 
 public Q_SLOTS:
     void setText(const QString&);
-    void setValid(bool valid);
+    void setValid(bool valid, bool with_warning=false);
     void setEnabled(bool enabled);
 
 Q_SIGNALS:
@@ -39,6 +44,7 @@ Q_SIGNALS:
 private Q_SLOTS:
     void markValid();
     void checkValidity();
+    bool checkWarning() const;
 };
 
 #endif // BITCOIN_QT_QVALIDATEDLINEEDIT_H