1 files changed, 146 insertions, 0 deletions
diff --git a/gdb/tui/tui-layout.h b/gdb/tui/tui-layout.h
index 23f05f3..d7f0731 100644
--- a/gdb/tui/tui-layout.h
+++ b/gdb/tui/tui-layout.h
@@ -25,6 +25,152 @@
 #include "tui/tui.h"
 #include "tui/tui-data.h"
 
+/* The basic object in a TUI layout.  This represents a single piece
+   of screen real estate.  Subclasses determine the exact
+   behavior.  */
+class tui_layout_base
+{
+public:
+
+  DISABLE_COPY_AND_ASSIGN (tui_layout_base);
+
+  /* Clone this object.  Ordinarily a layout is cloned before it is
+     used, so that any necessary modifications do not affect the
+     "skeleton" layout.  */
+  virtual std::unique_ptr<tui_layout_base> clone () const = 0;
+
+  /* Change the size and location of this layout.  */
+  virtual void apply (int x, int y, int width, int height) = 0;
+
+  /* Return the minimum and maximum height of this layout.  */
+  virtual void get_sizes (int *min_height, int *max_height) = 0;
+
+  /* True if the topmost item in this layout is boxed.  */
+  virtual bool top_boxed_p () const = 0;
+
+  /* True if the bottommost item in this layout is boxed.  */
+  virtual bool bottom_boxed_p () const = 0;
+
+  /* Return the name of this layout's window, or nullptr if this
+     layout does not represent a single window.  */
+  virtual const char *get_name () const
+  {
+    return nullptr;
+  }
+
+  /* Adjust the size of the window named NAME to NEW_HEIGHT, updating
+     the sizes of the other windows around it.  */
+  virtual bool adjust_size (const char *name, int new_height) = 0;
+
+  /* The most recent space allocation.  */
+  int x = 0;
+  int y = 0;
+  int width = 0;
+  int height = 0;
+
+protected:
+
+  tui_layout_base () = default;
+};
+
+/* A TUI layout object that displays a single window.  The window is
+   given by name.  */
+class tui_layout_window : public tui_layout_base
+{
+public:
+
+  explicit tui_layout_window (const char *name)
+    : m_contents (name)
+  {
+  }
+
+  DISABLE_COPY_AND_ASSIGN (tui_layout_window);
+
+  std::unique_ptr<tui_layout_base> clone () const override;
+
+  void apply (int x, int y, int width, int height) override;
+
+  const char *get_name () const override
+  {
+    return m_contents.c_str ();
+  }
+
+  bool adjust_size (const char *name, int new_height) override
+  {
+    return false;
+  }
+
+  bool top_boxed_p () const override;
+
+  bool bottom_boxed_p () const override;
+
+protected:
+
+  void get_sizes (int *min_height, int *max_height) override;
+
+private:
+
+  /* Type of content to display.  */
+  std::string m_contents;
+
+  /* When a layout is applied, this is updated to point to the window
+     object.  */
+  tui_gen_win_info *m_window = nullptr;
+};
+
+/* A TUI layout that holds other layouts.  */
+class tui_layout_split : public tui_layout_base
+{
+public:
+
+  tui_layout_split () = default;
+
+  DISABLE_COPY_AND_ASSIGN (tui_layout_split);
+
+  /* Add a new split layout to this layout.  WEIGHT is the desired
+     size, which is relative to the other weights given in this
+     layout.  */
+  tui_layout_split *add_split (int weight);
+
+  /* Add a new window to this layout.  NAME is the name of the window
+     to add.  WEIGHT is the desired size, which is relative to the
+     other weights given in this layout.  */
+  void add_window (const char *name, int weight);
+
+  std::unique_ptr<tui_layout_base> clone () const override;
+
+  void apply (int x, int y, int width, int height) override;
+
+  bool adjust_size (const char *name, int new_height) override;
+
+  bool top_boxed_p () const override;
+
+  bool bottom_boxed_p () const override;
+
+protected:
+
+  void get_sizes (int *min_height, int *max_height) override;
+
+private:
+
+  /* Set the weights from the current heights.  */
+  void set_weights_from_heights ();
+
+  struct split
+  {
+    /* The requested weight.  */
+    int weight;
+    /* The layout.  */
+    std::unique_ptr<tui_layout_base> layout;
+  };
+
+  /* The splits.  */
+  std::vector<split> m_splits;
+
+  /* True if this layout has already been applied at least once.  */
+  bool m_applied = false;
+};
+
 extern void tui_add_win_to_layout (enum tui_win_type);
 extern void tui_set_layout (enum tui_layout_type);