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//
// "$Id$"
//
// Example of Fl_Table with keyboard selection navigation - Greg Ercolano 04/14/2012
//
// Display a 10x10 multiplication table, and allow the user to
// make cell or row selections (with mouse or keyboard navigation)
// to select areas of the table, and show the sum of the cell's values.
//
// Started with the "testkeyboardnav.cxx" example from the original
// Fl_Table project, using Jean-Marc Lienher's additions for keyboard nav.
//
// Copyright 2003, 2012 Greg Ercolano.
// Copyright 2004 Jean-Marc Lienher
// 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 <FL/Fl.H>
#include <FL/fl_draw.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Toggle_Button.H>
#include <FL/Fl_Output.H>
#include <FL/Fl_Table_Row.H>
#include <FL/names.h>
#include <stdio.h>
#include <stdlib.h>
// GLOBALS
class MyTable;
Fl_Toggle_Button *G_rowselect = 0; // toggle to enable row selection
MyTable *G_table = 0; // table widget
Fl_Output *G_sum = 0; // displays sum of user's selection
class MyTable : public Fl_Table_Row {
protected:
// Handle drawing all cells in table
void draw_cell(TableContext context, int R=0,int C=0, int X=0,int Y=0,int W=0,int H=0) {
static char s[30];
switch ( context ) {
case CONTEXT_COL_HEADER:
case CONTEXT_ROW_HEADER:
fl_font(FL_HELVETICA | FL_BOLD, 14);
fl_push_clip(X, Y, W, H);
{
Fl_Color c = (context==CONTEXT_COL_HEADER) ? col_header_color() : row_header_color();
fl_draw_box(FL_THIN_UP_BOX, X, Y, W, H, c);
fl_color(FL_BLACK);
// Draw text for headers
sprintf(s, "%d", (context == CONTEXT_COL_HEADER) ? C : R);
fl_draw(s, X, Y, W, H, FL_ALIGN_CENTER);
}
fl_pop_clip();
return;
case CONTEXT_CELL: {
// Keyboard nav and mouse selection highlighting
int selected = G_rowselect->value() ? row_selected(R) : is_selected(R,C);
fl_draw_box(FL_THIN_UP_BOX, X, Y, W, H, selected ? FL_YELLOW : FL_WHITE);
// Draw text for the cell
fl_push_clip(X+3, Y+3, W-6, H-6);
{
fl_font(FL_HELVETICA, 14);
fl_color(FL_BLACK);
sprintf(s, "%d", R*C); // factor row + col for data cells
fl_draw(s, X+3, Y+3, W-6, H-6, FL_ALIGN_RIGHT);
}
fl_pop_clip();
return;
}
default:
return;
}
}
public:
// CTOR
MyTable(int x, int y, int w, int h, const char *l=0) : Fl_Table_Row(x,y,w,h,l) {
// Row init
row_header(1);
row_header_width(70);
row_resize(1);
rows(11);
row_height_all(20);
// Col init
col_header(1);
col_header_height(20);
col_resize(1);
cols(11);
col_width_all(70);
end(); // Fl_Table derives from Fl_Group, so end() it
}
~MyTable() { }
// Update the displayed sum value
int GetSelectionSum() {
int sum = -1;
for ( int R=0; R<rows(); R++ ) {
for ( int C=0; C<cols(); C++ ) {
if ( G_rowselect->value() ? row_selected(R) : is_selected(R,C) ) {
if ( sum == -1 ) sum = 0;
sum += R*C;
}
}
}
return(sum);
}
// Update the "Selection sum:" display
void UpdateSum() {
static char s[80];
int sum = GetSelectionSum();
if ( sum == -1 ) { sprintf(s, "(nothing selected)"); G_sum->color(48); }
else { sprintf(s, "%d", sum); G_sum->color(FL_WHITE); }
// Update only if different (lets one copy/paste from sum)
if ( strcmp(s,G_sum->value()))
{ G_sum->value(s); G_sum->redraw(); }
}
// Keyboard and mouse events
int handle(int e) {
int ret = Fl_Table_Row::handle(e);
if ( e == FL_KEYBOARD && Fl::event_key() == FL_Escape ) exit(0);
switch (e) {
case FL_PUSH:
case FL_RELEASE:
case FL_KEYUP:
case FL_KEYDOWN:
case FL_DRAG: {
//ret = 1; // *don't* indicate we 'handled' these, just update ('handling' prevents e.g. tab nav)
UpdateSum();
redraw();
break;
}
case FL_FOCUS: // tells FLTK we're interested in keyboard events
case FL_UNFOCUS:
ret = 1;
break;
}
return(ret);
}
};
// User changed the 'row select' toggle button
void RowSelect_CB(Fl_Widget *w, void*) {
w->window()->redraw(); // redraw with changes applied
G_table->UpdateSum();
}
int main() {
Fl::option(Fl::OPTION_ARROW_FOCUS, 0); // disable arrow focus nav (we want arrows to control cells)
Fl_Double_Window win(862, 312, "table-with-keynav");
win.begin();
// Create table
G_table = new MyTable(10, 30, win.w()-20, win.h()-70, "Times Table");
G_table->tooltip("Use mouse or Shift + Arrow Keys to make selections.\n"
"Sum of selected values is shown.");
// Row select toggle button
G_rowselect = new Fl_Toggle_Button(140,10,12,12,"Row selection");
G_rowselect->align(FL_ALIGN_LEFT);
G_rowselect->value(0);
G_rowselect->selection_color(FL_YELLOW);
G_rowselect->callback(RowSelect_CB);
G_rowselect->tooltip("Click to toggle row vs. row/col selection");
// Selection sum display
win.end();
win.begin();
G_sum = new Fl_Output(140,G_table->y()+G_table->h()+10,160,25,"Selection Sum:");
G_sum->value("(nothing selected)");
G_sum->color(48);
G_sum->tooltip("This field shows the sum of the selected cells in the table");
win.end();
win.resizable(G_table);
win.show();
return Fl::run();
}
//
// End of "$Id$".
//
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