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Added table-with-keynav.cxx to emphasize keyboard/mouse selection
(as per a question on the newsgroup about how to do this..) git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@9344 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Greg Ercolano
@@ -17,6 +17,7 @@ ALL = howto-add_fd-and-popen$(EXEEXT) \
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table-sort$(EXEEXT) \
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table-spreadsheet$(EXEEXT) \
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table-spreadsheet-with-keyboard-nav$(EXEEXT) \
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table-with-keynav$(EXEEXT) \
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tabs-simple$(EXEEXT) \
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textdisplay-with-colors$(EXEEXT) \
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texteditor-simple$(EXEEXT) \
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197
examples/table-with-keynav.cxx
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197
examples/table-with-keynav.cxx
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@@ -0,0 +1,197 @@
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//
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// "$Id$"
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//
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// Example of Fl_Table with keyboard selection navigation - Greg Ercolano 04/14/2012
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//
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// Display a 10x10 multiplication table, and allow the user to
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// make cell or row selections (with mouse or keyboard navigation)
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// to select areas of the table, and show the sum of the cell's values.
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//
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// Started with the "testkeyboardnav.cxx" example from the original
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// Fl_Table project, using Jean-Marc Lienher's additions for keyboard nav.
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//
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// Copyright 2003, 2012 Greg Ercolano.
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// Copyright 2004 Jean-Marc Lienher
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// Copyright 1998-2010 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// http://www.fltk.org/COPYING.php
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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#include <FL/Fl.H>
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#include <FL/fl_draw.H>
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#include <FL/Fl_Double_Window.H>
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#include <FL/Fl_Toggle_Button.H>
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#include <FL/Fl_Output.H>
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#include <FL/Fl_Table_Row.H>
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#include <stdio.h>
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#include <stdlib.h>
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// GLOBALS
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class MyTable;
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Fl_Toggle_Button *G_rowselect = 0; // toggle to enable row selection
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MyTable *G_table = 0; // table widget
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Fl_Output *G_sum = 0; // displays sum of user's selection
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class MyTable : public Fl_Table_Row {
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int row_beg, col_beg, row_end, col_end; // kb nav + mouse selection
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protected:
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// See if row R and column C is inside selection area
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int IsSelected(int R, int C) {
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if ( G_rowselect->value() == 0 )
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return( (R >= row_beg && R <= col_end &&
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C >= col_beg && C <= row_end) ? 1 : 0);
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else
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return( (R >= row_beg && R <= col_end) ? 1 : 0);
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}
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// Handle drawing all cells in table
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void draw_cell(TableContext context, int R=0,int C=0, int X=0,int Y=0,int W=0,int H=0) {
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static char s[30];
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switch ( context ) {
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case CONTEXT_STARTPAGE:
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// Whenever we redraw the table, update row/col selection vals first
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get_selection(row_beg, col_beg, col_end, row_end);
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break;
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case CONTEXT_COL_HEADER:
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case CONTEXT_ROW_HEADER:
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fl_font(FL_HELVETICA | FL_BOLD, 14);
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fl_push_clip(X, Y, W, H);
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{
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Fl_Color c = (context==CONTEXT_COL_HEADER) ? col_header_color() : row_header_color();
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fl_draw_box(FL_THIN_UP_BOX, X, Y, W, H, c);
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fl_color(FL_BLACK);
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// Draw text for headers
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sprintf(s, "%d", (context == CONTEXT_COL_HEADER) ? C : R);
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fl_draw(s, X, Y, W, H, FL_ALIGN_CENTER);
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}
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fl_pop_clip();
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return;
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case CONTEXT_CELL: {
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// Keyboard nav and mouse selection highlighting
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int is_select = IsSelected(R,C);
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fl_draw_box(FL_THIN_UP_BOX, X, Y, W, H, is_select ? FL_YELLOW : FL_WHITE);
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// Draw text for the cell
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fl_push_clip(X+3, Y+3, W-6, H-6);
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{
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fl_font(FL_HELVETICA, 14);
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fl_color(FL_BLACK);
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sprintf(s, "%d", R*C); // factor row + col for data cells
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fl_draw(s, X+3, Y+3, W-6, H-6, FL_ALIGN_RIGHT);
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}
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fl_pop_clip();
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return;
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}
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default:
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return;
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}
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}
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public:
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// CTOR
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MyTable(int x, int y, int w, int h, const char *l=0) : Fl_Table_Row(x,y,w,h,l) {
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// Row init
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row_header(1);
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row_header_width(70);
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row_resize(1);
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rows(11);
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row_height_all(20);
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// Col init
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col_header(1);
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col_header_height(20);
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col_resize(1);
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cols(11);
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col_width_all(70);
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end(); // Fl_Table derives from Fl_Group, so end() it
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}
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~MyTable() { }
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// Update the displayed sum value
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int GetSelectionSum() {
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int sum = -1;
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for ( int R=0; R<11; R++ ) {
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for ( int C=0; C<11; C++ ) {
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if ( IsSelected(R,C) ) {
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if ( sum == -1 ) sum = 0;
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sum += R*C;
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}
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}
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}
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return(sum);
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}
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// Update the "Selection sum:" display
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void UpdateSum() {
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static char s[80];
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int sum = GetSelectionSum();
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if ( sum == -1 ) { sprintf(s, "(nothing selected)"); G_sum->color(48); }
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else { sprintf(s, "%d", sum); G_sum->color(FL_WHITE); }
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G_sum->value(s);
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G_sum->redraw();
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}
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// Keyboard and mouse events
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int handle(int e) {
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// See if selection changed
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static int lastselect = 0;
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int thisselect = row_beg + (row_end*11) + (col_beg*11*2) + (col_end*11*3);
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int ret = Fl_Table::handle(e);
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if ( e == FL_KEYBOARD && Fl::event_key() == FL_Escape ) exit(0);
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switch (e) {
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case FL_PUSH:
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case FL_RELEASE:
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case FL_KEYUP:
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case FL_KEYDOWN:
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case FL_DRAG: {
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if ( lastselect != thisselect ) { // Selection changed?
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UpdateSum(); // update the sum
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redraw(); // XXX: needed for row selection to redraw properly
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lastselect = thisselect;
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}
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ret = 1;
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break;
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}
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case FL_FOCUS: // tells FLTK we're interested in keyboard events
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case FL_UNFOCUS:
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ret = 1;
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break;
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}
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return(ret);
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}
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};
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// User changed the 'row select' toggle button
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void RowSelect_CB(Fl_Widget *w, void*) {
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w->window()->redraw(); // redraw with changes applied
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G_table->UpdateSum();
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}
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int main() {
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Fl_Double_Window win(862, 312, "table-with-keynav");
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win.begin();
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// Create table
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G_table = new MyTable(10, 30, win.w()-20, win.h()-70, "Times Table");
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G_table->tooltip("Use mouse or arrow keys to make selections.\n"
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"Sum of selected values is shown.");
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// Row select toggle button
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G_rowselect = new Fl_Toggle_Button(140,10,12,12,"Row selection");
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G_rowselect->align(FL_ALIGN_LEFT);
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G_rowselect->value(0);
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G_rowselect->selection_color(FL_YELLOW);
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G_rowselect->callback(RowSelect_CB);
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G_rowselect->tooltip("Click to toggle row vs. row/col selection");
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// Selection sum display
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win.end();
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win.begin();
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G_sum = new Fl_Output(140,G_table->y()+G_table->h()+10,160,25,"Selection Sum:");
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G_sum->value("(nothing selected)");
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G_sum->color(48);
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win.end();
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win.resizable(G_table);
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win.show();
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return Fl::run();
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}
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//
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// End of "$Id$".
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//
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