Added a new example to demonstrate complex widgets as children

of a tree with custom resizing behavior, selectable contents, etc.

Also demonstrates the need for the new FL_TREE_ITEM_HEIGHT_FROM_WIDGET feature.



git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@9405 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

examples/Makefile

@@ -23,6 +23,7 @@ ALL = howto-add_fd-and-popen$(EXEEXT) \
       texteditor-simple$(EXEEXT) \
       tree-simple$(EXEEXT) \
       tree-as-container$(EXEEXT) \
+      tree-of-tables$(EXEEXT) \
       wizard-simple$(EXEEXT)
 
 # default target -- build everything

examples/tree-of-tables.cxx

@@ -0,0 +1,155 @@
+//
+// "$Id$"
+//
+//	Fl_Tree as a container of Fl_Table's. - erco 04/25/2012
+//
+//      Demonstrates how one can make a tree where each item
+//      contains a complex widget.
+//
+// Copyright 2010,2012 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:
+//
+//     http://www.fltk.org/COPYING.php
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+//
+#include <stdio.h>
+#include <math.h>		// powf()
+#include <FL/Fl.H>
+#include <FL/Fl_Double_Window.H>
+#include <FL/Fl_Tree.H>
+#include <FL/Fl_Table.H>
+#ifndef PI
+#define PI 3.14159
+#endif
+
+#if FLTK_ABI_VERSION >= 10302
+class MyTable : public Fl_Table {
+  char *mode;
+public:
+  MyTable(int X,int Y,int W,int H,char *mode) : Fl_Table(X,Y,W,H) {
+    rows(11); row_height_all(20); row_header(1);
+    cols(11); col_width_all(60);  col_header(1);
+    col_resize(1);				// enable column resizing
+    this->mode = mode;
+    end();
+  }
+  void resize(int X,int Y,int W,int H) {
+      if ( W > 718 ) W = 718;			// don't exceed 700 in width
+      Fl_Table::resize(X,Y,W,h());		// disallow changes in height
+  }
+  // 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, int COL, int X, int Y, int W, int H) {
+    static char s[40];
+    switch ( context ) {
+      case CONTEXT_STARTPAGE:         // before page is drawn..
+        fl_font(FL_HELVETICA, 10);    // set the font for our drawing operations
+        return; 
+      case CONTEXT_COL_HEADER:	      // Drawing column/row headers
+      case CONTEXT_ROW_HEADER: {
+        int val = context==CONTEXT_COL_HEADER ? COL : ROW;
+        int col = context==CONTEXT_COL_HEADER ? col_header_color() : row_header_color();
+        fl_push_clip(X,Y,W,H);
+	if ( strcmp(mode, "SinCos" ) == 0 ) { sprintf(s, "%.2f", ((val/10.0)*PI)); }
+	else sprintf(s,"%d",val);
+	fl_draw_box(FL_THIN_UP_BOX, X,Y,W,H, col);
+	fl_color(FL_BLACK);
+	fl_draw(s, X,Y,W,H, FL_ALIGN_CENTER);
+        fl_pop_clip();
+        return; 
+      }
+      case CONTEXT_CELL: {            // Draw data in cells
+        int col = is_selected(ROW,COL) ? FL_YELLOW : FL_WHITE;
+        fl_push_clip(X,Y,W,H);
+        if ( strcmp(mode, "Addition") == 0 ) { sprintf(s, "%d", ROW+COL); } else
+        if ( strcmp(mode, "Subtract") == 0 ) { sprintf(s, "%d", ROW-COL); } else
+	if ( strcmp(mode, "Multiply") == 0 ) { sprintf(s, "%d", ROW*COL); } else
+	if ( strcmp(mode, "Divide"  ) == 0 ) { if ( COL==0 ) sprintf(s, "N/A"); else sprintf(s, "%.2f", (float)ROW/(float)COL); } else
+	if ( strcmp(mode, "Exponent") == 0 ) { sprintf(s, "%g", powf((float)ROW,(float)COL)); } else
+	if ( strcmp(mode, "SinCos"  ) == 0 ) { sprintf(s, "%.2f", sin((ROW/10.0)*PI) * cos((COL/10.0)*PI)); } else
+	                                     { sprintf(s, "???"); }
+	fl_color(col); fl_rectf(X,Y,W,H);				// bg
+	fl_color(FL_GRAY0); fl_draw(s, X,Y,W,H, FL_ALIGN_CENTER);	// text
+	fl_color(color());  fl_rect(X,Y,W,H);				// box
+        fl_pop_clip();
+        return;
+      }
+      default:
+        return;
+    }
+  }
+};
+
+int main(int argc, char *argv[]) {
+  Fl_Double_Window *win = new Fl_Double_Window(700, 400, "Tree of tables");
+  win->begin();
+  {
+    // Create tree
+    Fl_Tree *tree = new Fl_Tree(10, 10, win->w()-20, win->h()-20);
+    tree->root()->label("Math Tables");
+    tree->item_labelfont(FL_COURIER);		// font to use for items
+    tree->linespacing(4);			// extra space between items
+    tree->item_draw_mode(tree->item_draw_mode() |
+                         FL_TREE_ITEM_DRAW_LABEL_AND_WIDGET |    // draw item with widget() next to it
+	                 FL_TREE_ITEM_HEIGHT_FROM_WIDGET);       // make item height follow table's height
+    tree->selectmode(FL_TREE_SELECT_NONE);	// font to use for items
+    tree->widgetmarginleft(12);			// space between item and table
+    tree->connectorstyle(FL_TREE_CONNECTOR_DOTTED);
+
+    // Create tables, assign each a tree item
+    tree->begin();
+    {
+      MyTable *table;
+      Fl_Tree_Item *item;
+
+      table = new MyTable(0,0,500,156,"Addition");
+      item = tree->add("Arithmetic/Addition");
+      item->widget(table);
+
+      table = new MyTable(0,0,500,156,"Subtract");
+      item = tree->add("Arithmetic/Subtract");
+      item->widget(table);
+
+      table = new MyTable(0,0,500,156,"Multiply");
+      item = tree->add("Arithmetic/Multiply");
+      item->widget(table);
+
+      table = new MyTable(0,0,500,156,"Divide");
+      item = tree->add("Arithmetic/Divide  ");
+      item->widget(table);
+
+      table = new MyTable(0,0,500,156,"Exponent");
+      item = tree->add("Misc/Exponent");
+      item->widget(table);
+
+      table = new MyTable(0,0,500,156,"SinCos");
+      item = tree->add("Misc/Sin*Cos ");
+      item->widget(table);
+    }
+    tree->end();
+  }
+  win->end();
+  win->resizable(win);
+  win->show(argc, argv);
+  return(Fl::run());
+}
+#else /*FLTK_ABI_VERSION*/
+#include <FL/fl_ask.H>
+int main(int argc, char *argv[]) {
+  fl_alert("This example must have FLTK_ABI_VERSION enabled to work properly.");
+  return 1;
+}
+#endif
+
+//
+// End of "$Id$".
+//