From 053320b7cf5e1f4363c20edc9275cd352641cbd9 Mon Sep 17 00:00:00 2001
From: TryTwo <taolas@gmail.com>
Date: Thu, 20 Oct 2022 00:56:06 -0700
Subject: [PATCH] MemoryWidget: Make search address a combobox that holds
 address history. Always update the combobox when a new target address is
 sent.

---
 .../Core/DolphinQt/Debugger/MemoryWidget.cpp  | 39 +++++++++++++++----
 Source/Core/DolphinQt/Debugger/MemoryWidget.h |  2 +-
 2 files changed, 33 insertions(+), 8 deletions(-)

diff --git a/Source/Core/DolphinQt/Debugger/MemoryWidget.cpp b/Source/Core/DolphinQt/Debugger/MemoryWidget.cpp
index f6189ebb62..4019450c3a 100644
--- a/Source/Core/DolphinQt/Debugger/MemoryWidget.cpp
+++ b/Source/Core/DolphinQt/Debugger/MemoryWidget.cpp
@@ -97,10 +97,13 @@ void MemoryWidget::CreateWidgets()
   // Search
   auto* m_address_splitter = new QSplitter(Qt::Horizontal);
 
-  m_search_address = new QLineEdit;
+  m_search_address = new QComboBox;
+  m_search_address->setInsertPolicy(QComboBox::InsertAtTop);
+  m_search_address->setDuplicatesEnabled(false);
+  m_search_address->setEditable(true);
+  m_search_address->setMaxVisibleItems(8);
   m_search_offset = new QLineEdit;
 
-  m_search_address->setMaxLength(8);
   m_search_offset->setMaxLength(9);
   m_search_address->setPlaceholderText(tr("Search Address"));
   m_search_offset->setPlaceholderText(tr("Offset"));
@@ -297,7 +300,7 @@ void MemoryWidget::CreateWidgets()
 
 void MemoryWidget::ConnectWidgets()
 {
-  connect(m_search_address, &QLineEdit::textChanged, this, &MemoryWidget::OnSearchAddress);
+  connect(m_search_address, &QComboBox::currentTextChanged, this, &MemoryWidget::OnSearchAddress);
   connect(m_search_offset, &QLineEdit::textChanged, this, &MemoryWidget::OnSearchAddress);
   connect(m_data_edit, &QLineEdit::textChanged, this, &MemoryWidget::ValidateAndPreviewInputValue);
 
@@ -479,6 +482,28 @@ void MemoryWidget::OnBPTypeChanged()
 
 void MemoryWidget::SetAddress(u32 address)
 {
+  // Store current and target address in combo box
+  const QSignalBlocker blocker(m_search_address);
+  const QString current_text = m_search_address->currentText();
+  const QString target_addr = QString::number(address, 16);
+  bool good;
+  const u32 current_addr = current_text.toUInt(&good, 16);
+
+  if (good)
+  {
+    AddressSpace::Accessors* accessors =
+        AddressSpace::GetAccessors(m_memory_view->GetAddressSpace());
+    good = accessors->IsValidAddress(current_addr);
+  }
+
+  if (m_search_address->findText(current_text) == -1 && good)
+    m_search_address->insertItem(0, current_text);
+
+  if (m_search_address->findText(target_addr) == -1)
+    m_search_address->insertItem(0, target_addr);
+
+  m_search_address->setCurrentText(target_addr);
+
   m_memory_view->SetAddress(address);
   Settings::Instance().SetMemoryVisible(true);
   raise();
@@ -745,8 +770,8 @@ MemoryWidget::TargetAddress MemoryWidget::GetTargetAddress() const
   TargetAddress target;
 
   // Returns 0 if conversion fails
-  const u32 addr = m_search_address->text().toUInt(&target.is_good_address, 16);
-  target.is_good_address |= m_search_address->text().isEmpty();
+  const u32 addr = m_search_address->currentText().toUInt(&target.is_good_address, 16);
+  target.is_good_address |= m_search_address->currentText().isEmpty();
   const s32 offset = m_search_offset->text().toInt(&target.is_good_offset, 16);
   const u32 neg_offset = offset != std::numeric_limits<s32>::min() ?
                              -offset :
@@ -789,7 +814,7 @@ void MemoryWidget::FindValue(bool next)
     return;
   }
 
-  if (!m_search_address->text().isEmpty())
+  if (!m_search_address->currentText().isEmpty())
   {
     // skip the quoted address so we don't potentially refind the last result
     target_addr.address += next ? 1 : -1;
@@ -807,7 +832,7 @@ void MemoryWidget::FindValue(bool next)
 
     u32 offset = *found_addr;
 
-    m_search_address->setText(QStringLiteral("%1").arg(offset, 8, 16, QLatin1Char('0')));
+    m_search_address->setCurrentText(QStringLiteral("%1").arg(offset, 8, 16, QLatin1Char('0')));
     m_search_offset->clear();
 
     m_memory_view->SetAddress(offset);
diff --git a/Source/Core/DolphinQt/Debugger/MemoryWidget.h b/Source/Core/DolphinQt/Debugger/MemoryWidget.h
index acf2abef5f..ad69f6b258 100644
--- a/Source/Core/DolphinQt/Debugger/MemoryWidget.h
+++ b/Source/Core/DolphinQt/Debugger/MemoryWidget.h
@@ -75,7 +75,7 @@ private:
 
   MemoryViewWidget* m_memory_view;
   QSplitter* m_splitter;
-  QLineEdit* m_search_address;
+  QComboBox* m_search_address;
   QLineEdit* m_search_offset;
   QLineEdit* m_data_edit;
   QCheckBox* m_base_check;