add initial BufferView class

src/core/BufferView.cc

@@ -0,0 +1,22 @@
+#include "BufferView.h"
+
+BufferView::BufferView(std::shared_ptr<Buffer> buffer,
+        std::shared_ptr<Buffer::Iterator> iterator)
+    : m_buffer(buffer),
+      m_iterator(iterator)
+{
+    m_width = 1;
+    m_height = 1;
+    m_tabstop = 1;
+}
+
+void BufferView::resize(int width, int height)
+{
+    m_width = std::max(1, width);
+    m_height = std::max(1, height);
+}
+
+void BufferView::set_tabstop(int tabstop)
+{
+    m_tabstop = std::max(1, tabstop);
+}

src/core/BufferView.h

@@ -0,0 +1,26 @@
+#ifndef BUFFERVIEW_H
+#define BUFFERVIEW_H
+
+#include "Buffer.h"
+
+/**
+ * Tracks a "view" of a buffer, which is a two-dimensional grid of characters
+ * that displays a section of a buffer's contents.
+ */
+class BufferView
+{
+public:
+    BufferView(std::shared_ptr<Buffer> buffer,
+            std::shared_ptr<Buffer::Iterator> iterator);
+    void resize(int width, int height);
+    void set_tabstop(int tabstop);
+
+protected:
+    std::shared_ptr<Buffer> m_buffer;
+    std::shared_ptr<Buffer::Iterator> m_iterator;
+    int m_width;
+    int m_height;
+    int m_tabstop;
+};
+
+#endif