STR#3283: Add new Fl_Table right-click popup menu example

1 files changed, 131 insertions, 0 deletions

diff --git a/examples/table-with-right-click-menu.cxx b/examples/table-with-right-click-menu.cxx
new file mode 100644
index 000000000..7f59ab575
--- /dev/null
+++ b/examples/table-with-right-click-menu.cxx
@@ -0,0 +1,131 @@
+//
+//    Simple example of using Fl_Table with popup menus - Greg Ercolano 12/16/2023
+//    Ref: https://www.seriss.com/people/erco/fltk/#GLDynamicPopup
+//
+// Copyright 2023 Greg Ercolano.
+// Copyright 1998-2010 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
+//
+#include <FL/Fl.H>
+#include <FL/Fl_Double_Window.H>
+#include <FL/Fl_Table.H>
+#include <FL/fl_draw.H>
+#include <FL/Fl_Menu_Button.H>
+
+#define MAX_ROWS 30
+#define MAX_COLS 26             // A-Z
+
+// Derive a class from Fl_Table
+class MyTable : public Fl_Table {
+  // Post context menu at current event x,y
+  void PostContextMenu() {
+    int context = callback_context();
+    switch (context) {
+      case CONTEXT_COL_HEADER:
+      case CONTEXT_CELL: {
+        char s[80];
+        // Create context sensitive menu label
+        if ( context == CONTEXT_CELL ) {
+          sprintf(s, "Cell %c%d", 'A'+callback_col(), callback_row());
+        } else {
+          sprintf(s, "Column %c", 'A'+callback_col());
+        }
+        // Post dynamically created context menu, get user's choice
+        Fl_Menu_Button menu(Fl::event_x(), Fl::event_y(), 80, 1);
+        menu.add(s, 0, 0, 0, FL_MENU_DIVIDER|FL_MENU_INACTIVE);
+        menu.add("Item 1");
+        menu.add("Item 2");
+        const Fl_Menu_Item *item = menu.popup();
+        if ( item ) printf("You chose '%s'\n", item->label());
+        break;
+      }
+      default: break;
+    }
+  }
+
+  // MyTable callback
+  static void my_callback(Fl_Widget*, void*data) {
+    MyTable *o = (MyTable*)data;
+    if ( Fl::event_button() == FL_RIGHT_MOUSE ) o->PostContextMenu();
+  }
+
+  // Draw the row/col headings
+  //    Make this a dark thin upbox with the text inside.
+  //
+  void DrawHeader(const char *s, int X, int Y, int W, int H) {
+    fl_push_clip(X,Y,W,H);
+      fl_draw_box(FL_THIN_UP_BOX, X,Y,W,H, row_header_color());
+      fl_color(FL_BLACK);
+      fl_draw(s, X,Y,W,H, FL_ALIGN_CENTER);
+    fl_pop_clip();
+  }
+  // Draw the cells
+  void DrawCell(const char *s, int X, int Y, int W, int H) {
+    fl_push_clip(X,Y,W,H);
+      fl_color(FL_WHITE); fl_rectf(X,Y,W,H);                    // Draw cell bg
+      fl_color(FL_GRAY0); fl_draw(s, X,Y,W,H, FL_ALIGN_CENTER); // Draw cell text
+      fl_color(color());  fl_rect(X,Y,W,H);                     // Draw box border
+    fl_pop_clip();
+  }
+  // Handle drawing table's cells
+  //     Fl_Table calls this function to draw each visible cell in the table.
+  //     It's up to us to use FLTK's drawing functions to draw the cells the way we want.
+  //
+  void draw_cell(TableContext context, int ROW=0, int COL=0, int X=0, int Y=0, int W=0, int H=0) FL_OVERRIDE {
+    static char s[40];
+    switch ( context ) {
+      case CONTEXT_STARTPAGE:                   // before page is drawn..
+        fl_font(FL_HELVETICA, 16);              // set the font for our drawing operations
+        return;
+      case CONTEXT_COL_HEADER:                  // Draw column headers
+        sprintf(s,"%c",'A'+COL);                // "A", "B", "C", etc.
+        DrawHeader(s,X,Y,W,H);
+        return;
+      case CONTEXT_ROW_HEADER:                  // Draw row headers
+        sprintf(s,"%03d:",ROW);                 // "001:", "002:", etc
+        DrawHeader(s,X,Y,W,H);
+        return;
+      case CONTEXT_CELL:                        // Draw cells
+        sprintf(s,"%c%d",'A'+COL,ROW);
+        DrawCell(s,X,Y,W,H);
+        return;
+      default:
+        return;
+    }
+  }
+public:
+  // Constructor
+  MyTable(int X, int Y, int W, int H, const char *L=0) : Fl_Table(X,Y,W,H,L) {
+    // Rows
+    rows(MAX_ROWS);             // how many rows
+    row_header(1);              // enable row headers (along left)
+    row_height_all(20);         // default height of rows
+    row_resize(0);              // disable row resizing
+    // Cols
+    cols(MAX_COLS);             // how many columns
+    col_header(1);              // enable column headers (along top)
+    col_width_all(80);          // default width of columns
+    col_resize(1);              // enable column resizing
+    end();                      // end the Fl_Table group
+    callback(my_callback, (void*)this);  // set a callback for the table
+  }
+  ~MyTable() { }
+};
+
+int main(int argc, char **argv) {
+  Fl_Double_Window win(900, 400, "Table Simple");
+  MyTable table(10,10,880,380);
+  win.end();
+  win.resizable(table);
+  win.show(argc,argv);
+  return(Fl::run());
+}