Fix and update alignment #346 (#701)

* interactive layout alignment rewritten
* interface for new alignment rules
* new alignment dialog box
* user defined layout rules added
* layout rules can be stored in projects, settings, and external files
* Valgrind verification

1 files changed, 168 insertions, 0 deletions

diff --git a/fluid/Fd_Snap_Action.h b/fluid/Fd_Snap_Action.h
new file mode 100644
index 000000000..d107e957a
--- /dev/null
+++ b/fluid/Fd_Snap_Action.h
@@ -0,0 +1,168 @@
+//
+// Snap action header file for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 2023 by Bill Spitzak and others.
+//
+// This library is free software. Distribution and use rights are outlined in
+// the file "COPYING" which should have been included with this file.  If this
+// file is missing or damaged, see the license at:
+//
+//     https://www.fltk.org/COPYING.php
+//
+// Please see the following page on how to report bugs and issues:
+//
+//     https://www.fltk.org/bugs.php
+//
+
+#ifndef _FLUID_FD_SNAP_ACTION_H
+#define _FLUID_FD_SNAP_ACTION_H
+
+#include "Fl_Window_Type.h"
+
+struct Fl_Menu_Item;
+
+enum {
+  FD_STORE_INTERNAL,
+  FD_STORE_USER,
+  FD_STORE_PROJECT,
+  FD_STORE_FILE,
+};
+
+class Fd_Layout_Preset {
+public:
+  int left_window_margin;
+  int right_window_margin;
+  int top_window_margin;
+  int bottom_window_margin;
+  int window_grid_x;
+  int window_grid_y;
+
+  int left_group_margin;
+  int right_group_margin;
+  int top_group_margin;
+  int bottom_group_margin;
+  int group_grid_x;
+  int group_grid_y;
+
+  int top_tabs_margin;
+  int bottom_tabs_margin;
+
+  int widget_min_w;
+  int widget_inc_w;
+  int widget_gap_x;
+  int widget_min_h;
+  int widget_inc_h;
+  int widget_gap_y;
+
+  int labelfont;
+  int labelsize;
+  int textfont;
+  int textsize;
+
+  void write(Fl_Preferences &prefs);
+  void read(Fl_Preferences &prefs);
+  void write(Fd_Project_Writer*);
+  void read(Fd_Project_Reader*);
+};
+
+extern Fd_Layout_Preset *layout;
+
+class Fd_Layout_Suite {
+public:
+  char *name_;
+  char *menu_label;
+  Fd_Layout_Preset *layout[3]; // application, dialog, toolbox;
+  int storage_;
+  void write(Fl_Preferences &prefs);
+  void read(Fl_Preferences &prefs);
+  void write(Fd_Project_Writer*);
+  void read(Fd_Project_Reader*);
+  void update_label();
+  void storage(int s) { storage_ = s; update_label(); }
+  void name(const char *n);
+  void init();
+  ~Fd_Layout_Suite();
+public:
+
+};
+
+class Fd_Layout_List {
+public:
+  Fl_Menu_Item *main_menu_;
+  Fl_Menu_Item *choice_menu_;
+  Fd_Layout_Suite *list_;
+  int list_size_;
+  int list_capacity_;
+  bool list_is_static_;
+  int current_suite_;
+  int current_preset_;
+  char *filename_;
+public:
+  Fd_Layout_List();
+  ~Fd_Layout_List();
+  void update_dialogs();
+  void update_menu_labels();
+  int current_suite() const { return current_suite_; }
+  void current_suite(int ix);
+  void current_suite(Fl_String);
+  int current_preset() const { return current_preset_; }
+  void current_preset(int ix);
+  Fd_Layout_Suite &operator[](int ix) { return list_[ix]; }
+  int add(const char *name);
+  void rename(const char *name);
+  void capacity(int);
+
+  int load(const char *filename);
+  int save(const char *filename);
+  void write(Fl_Preferences &prefs, int storage);
+  void read(Fl_Preferences &prefs, int storage);
+  void write(Fd_Project_Writer*);
+  void read(Fd_Project_Reader*);
+  int add(Fd_Layout_Suite*);
+  void remove(int index);
+  void remove_all(int storage);
+  Fd_Layout_Preset *at(int);
+  int size();
+};
+
+extern Fd_Layout_List g_layout_list;
+
+/**
+ \brief Structure holding all the data to perform interactive alignment operations.
+ */
+typedef struct Fd_Snap_Data {
+  int dx, dy;           ///< distance of the mouse from its initial PUSH event
+  int bx, by, br, bt;   ///< bounding box of the original push event or current bounding box when drawing
+  int drag;             ///< drag event mask
+  int x_dist, y_dist;   ///< current closest snapping distance in x and y
+  int dx_out, dy_out;   ///< current closest snapping point as a delta
+  Fl_Widget_Type *wgt;  ///< first selected widget
+  Fl_Window_Type *win;  ///< window that handles the drag action
+  int ex_out, ey_out;   ///< chosen snap position
+} Fd_Snap_Data;
+
+/**
+ \brief Find points of interest when moving the bounding box of all selected widgets.
+ */
+class Fd_Snap_Action {
+protected:
+  int check_x_(Fd_Snap_Data &d, int x_ref, int x_snap);
+  int check_y_(Fd_Snap_Data &d, int y_ref, int y_snap);
+  void check_x_y_(Fd_Snap_Data &d, int x_ref, int x_snap, int y_ref, int y_snap);
+  void clr() { ex = dx = 0x7fff;  }
+public:
+  int ex, ey, dx, dy, type, mask;
+  Fd_Snap_Action() : ex(0x7fff), ey(0x7fff), dx(128), dy(128), type(0), mask(0) { }
+  virtual void check(Fd_Snap_Data &d) = 0;
+  virtual void draw(Fd_Snap_Data &d) { }
+  virtual bool matches(Fd_Snap_Data &d);
+public:
+  static int eex, eey;
+  static Fd_Snap_Action *list[];
+  static void check_all(Fd_Snap_Data &d);
+  static void draw_all(Fd_Snap_Data &d);
+  static void get_resize_stepsize(int &x_step, int &y_step);
+  static void get_move_stepsize(int &x_step, int &y_step);
+};
+
+#endif // _FLUID_FD_SNAP_ACTION_H