Qt: Add debugger UI

src/duckstation-qt/memoryviewwidget.h

@@ -0,0 +1,53 @@
+#pragma once
+#include <QtWidgets/QAbstractScrollArea>
+
+// Based on https://stackoverflow.com/questions/46375673/how-can-realize-my-own-memory-viewer-by-qt
+
+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();
+
+  size_t addressOffset() const { return m_address_offset; }
+
+  void setData(size_t address_offset, const void* data_ptr, size_t data_size);
+  void setHighlightRange(size_t start, size_t end);
+  void clearHighlightRange();
+  void scrolltoOffset(size_t offset);
+  void scrollToAddress(size_t address);
+  void setFont(const QFont& font);
+
+protected:
+  void paintEvent(QPaintEvent*);
+  void resizeEvent(QResizeEvent*);
+
+private Q_SLOTS:
+  void adjustContent();
+
+private:
+  int addressWidth() const;
+  int hexWidth() const;
+  int asciiWidth() const;
+  void updateMetrics();
+
+  const void* m_data;
+  size_t m_data_size;
+  size_t m_address_offset;
+
+  size_t m_start_offset;
+  size_t m_end_offset;
+
+  size_t m_highlight_start = 0;
+  size_t m_highlight_end = 0;
+
+  unsigned m_bytes_per_line;
+
+  int m_char_width;
+  int m_char_height;
+
+  int m_rows_visible;
+};