Qt: Add edit function to debugger memory view

src/duckstation-qt/memoryviewwidget.h

@@ -8,13 +8,13 @@ class MemoryViewWidget : public QAbstractScrollArea
 public:
   Q_OBJECT
 public:
-  MemoryViewWidget(QWidget* parent = nullptr, size_t address_offset = 0, const void* data_ptr = nullptr,
-                   size_t data_size = 0);
+  MemoryViewWidget(QWidget* parent = nullptr, size_t address_offset = 0, void* data_ptr = nullptr, size_t data_size = 0,
+                   bool data_editable = false);
   ~MemoryViewWidget();
 
   size_t addressOffset() const { return m_address_offset; }
 
-  void setData(size_t address_offset, const void* data_ptr, size_t data_size);
+  void setData(size_t address_offset, void* data_ptr, size_t data_size, bool data_editable);
   void setHighlightRange(size_t start, size_t end);
   void clearHighlightRange();
   void scrolltoOffset(size_t offset);
@@ -22,19 +22,25 @@ public:
   void setFont(const QFont& font);
 
 protected:
-  void paintEvent(QPaintEvent*);
-  void resizeEvent(QResizeEvent*);
+  void paintEvent(QPaintEvent* event);
+  void resizeEvent(QResizeEvent* event);
+  void mousePressEvent(QMouseEvent* event);
+  void mouseMoveEvent(QMouseEvent* event);
+  void keyPressEvent(QKeyEvent* event);
 
 private Q_SLOTS:
   void adjustContent();
 
 private:
+  static constexpr size_t INVALID_SELECTED_ADDRESS = ~static_cast<size_t>(0);
+
   int addressWidth() const;
   int hexWidth() const;
   int asciiWidth() const;
   void updateMetrics();
+  void updateSelectedByte(const QPoint& pos);
 
-  const void* m_data;
+  void* m_data;
   size_t m_data_size;
   size_t m_address_offset;
 
@@ -44,6 +50,11 @@ private:
   size_t m_highlight_start = 0;
   size_t m_highlight_end = 0;
 
+  size_t m_selected_address = INVALID_SELECTED_ADDRESS;
+  int m_editing_nibble = -1;
+  bool m_selection_was_ascii = false;
+  bool m_data_editable = false;
+
   unsigned m_bytes_per_line;
 
   int m_char_width;