1 files changed, 90 insertions, 0 deletions
diff --git a/fluid/widgets/custom_widgets.h b/fluid/widgets/custom_widgets.h
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+//
+// Shortcut header file for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 1998-2023 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_SHORTCUT_BUTTON_H
+#define _FLUID_SHORTCUT_BUTTON_H
+
+#include <FL/Fl_Button.H>
+#include <FL/Fl_Input.H>
+
+// Adding drag and drop for dragging widgets into windows.
+class Widget_Bin_Button : public Fl_Button {
+public:
+  int handle(int) FL_OVERRIDE;
+  Widget_Bin_Button(int X,int Y,int W,int H, const char* l = 0) :
+  Fl_Button(X,Y,W,H,l) { }
+};
+
+// Adding drag and drop functionality to drag window prototypes onto the desktop.
+class Widget_Bin_Window_Button : public Fl_Button {
+public:
+  int handle(int) FL_OVERRIDE;
+  Widget_Bin_Window_Button(int X,int Y,int W,int H, const char* l = 0) :
+  Fl_Button(X,Y,W,H,l) { }
+};
+
+// Callback signature for function returning the value of a variable.
+typedef int (Fluid_Coord_Callback)(class Fluid_Coord_Input const *, void*);
+
+// Entry for a list of variables available to an input field.
+// Fluid_Coord_Input::variables() expects an array of Fluid_Coord_Input_Vars
+// with the last entry's name_ set to NULL.
+typedef struct Fluid_Coord_Input_Vars {
+  const char *name_;
+  Fluid_Coord_Callback *callback_;
+} Fluid_Coord_Input_Vars;
+
+// A text input widget that understands simple math.
+class Fluid_Coord_Input : public Fl_Input
+{
+  Fl_Callback *user_callback_;
+  Fluid_Coord_Input_Vars *vars_;
+  void *vars_user_data_;
+  static void callback_handler_cb(Fluid_Coord_Input *This, void *v);
+  void callback_handler(void *v);
+  int eval_var(uchar *&s) const;
+  int eval(uchar *&s, int prio) const;
+  int eval(const char *s) const;
+
+public:
+  Fluid_Coord_Input(int x, int y, int w, int h, const char *l=0L);
+
+  /** Return the text in the widget text field. */
+  const char *text() const { return Fl_Input::value(); }
+
+  /** Set the text in the text field */
+  void text(const char *v) { Fl_Input::value(v); }
+
+  int value() const;
+  void value(int v);
+
+  /** Set the general callback for this widget. */
+  void callback(Fl_Callback *cb) {
+    user_callback_ = cb;
+  }
+
+  /** Set the list of the available variables
+   \param vars array of variables, last entry `has name_` set to `NULL`
+   \param user_data is forwarded to the Variable callback */
+  void variables(Fluid_Coord_Input_Vars *vars, void *user_data) {
+    vars_ = vars;
+    vars_user_data_ = user_data;
+  }
+
+  int handle(int) FL_OVERRIDE;
+};
+
+#endif