Added sortable table example.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@7926 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 288 insertions, 0 deletions

diff --git a/examples/table-sort.cxx b/examples/table-sort.cxx
new file mode 100644
index 000000000..d6189f9af
--- /dev/null
+++ b/examples/table-sort.cxx
@@ -0,0 +1,288 @@
+//
+// "$Id$"
+//
+//  table-sort -- An example application using a sortable Fl_Table
+//                
+//      Example of a non-trivial application that uses Fl_Table 
+//      with sortable columns. This example is not trying to be simple,
+//      but to demonstrate the complexities of an actual small app.
+//
+// HISTORY
+//      03/18/2003 -- 'sortapp.cxx' added to the Fl_Table widget package -erco
+//      11/30/2010 -- Modified and added to FLTK examples -erco
+//
+// Copyright 1998-2010 by Bill Spitzak and others.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+// USA.
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+// 
+
+#include <FL/Fl.H>
+#include <FL/Fl_Window.H>
+#include <FL/fl_draw.H>
+#include <FL/Fl_Table_Row.H>
+
+#include <stdio.h>
+#include <string.h>
+#include <vector>
+#include <algorithm>            // STL sort
+
+#define MARGIN 20
+
+#ifdef _WIN32
+// WINDOWS
+#define DIRCMD          "dir"
+#define DIRHEADER       { "Date", "Time", "Size", "Filename", "", "", "", "", "" }
+#define popen           _popen
+#else /*_WIN32*/
+// UNIX
+#define DIRCMD          "ls -l"
+#define DIRHEADER       { "Perms", "#L", "Own", "Group", "Size", "Date", "", "", "Filename" }
+#endif /*_WIN32*/
+
+// A single row of columns
+class Row {
+public:
+    std::vector<char*> cols;
+};
+
+// Sort class to handle sorting column using std::sort
+class SortColumn {
+    int _col, _reverse;
+public:
+    SortColumn(int col, int reverse) {
+        _col = col;
+        _reverse = reverse;
+    }
+    bool operator()(const Row &a, const Row &b) {
+        const char *ap = ( _col < (int)a.cols.size() ) ? a.cols[_col] : "",
+                   *bp = ( _col < (int)b.cols.size() ) ? b.cols[_col] : "";
+        if ( isdigit(*ap) && isdigit(*bp) ) {           // cheezy detection of numeric data
+            // Numeric sort
+            int av=0; sscanf(ap, "%d", &av);
+            int bv=0; sscanf(bp, "%d", &bv);
+            return( _reverse ? av < bv : bv < av );
+        } else {
+            // Alphabetic sort
+            return( _reverse ? strcmp(ap, bp) > 0 : strcmp(ap, bp) < 0 );
+        }
+    }
+};
+
+// Derive a custom class from Fl_Table_Row
+class MyTable : public Fl_Table_Row {
+private:
+    std::vector<Row> _rowdata;                                  // data in each row
+    int _sort_reverse;
+    int _sort_lastcol;
+
+    static void event_callback(Fl_Widget*, void*);
+    void event_callback2();                                     // callback for table events
+
+protected:
+    void draw_cell(TableContext context, int R=0, int C=0,      // table cell drawing
+                   int X=0, int Y=0, int W=0, int H=0);
+    void sort_column(int col, int reverse=0);                   // sort table by a column
+    void draw_sort_arrow(int X,int Y,int W,int H,int sort);
+
+public:
+    // Ctor
+    MyTable(int x, int y, int w, int h, const char *l=0) : Fl_Table_Row(x,y,w,h,l) {
+        _sort_reverse = 0;
+        _sort_lastcol = -1;
+        end();
+        callback(event_callback, (void*)this);
+    }
+    ~MyTable() { }                              // Dtor
+    void load_command(const char *cmd);         // Load the output of a command into table
+    void autowidth(int pad);                    // Automatically set column widths to data
+    void resize_window();                       // Resize parent window to size of table
+};
+
+// Sort a column up or down
+void MyTable::sort_column(int col, int reverse) {
+    std::sort(_rowdata.begin(), _rowdata.end(), SortColumn(col, reverse));
+    redraw();
+}
+
+// Draw sort arrow
+void MyTable::draw_sort_arrow(int X,int Y,int W,int H,int sort) {
+    int xlft = X+(W-6)-8;
+    int xctr = X+(W-6)-4;
+    int xrit = X+(W-6)-0;
+    int ytop = Y+(H/2)-4;
+    int ybot = Y+(H/2)+4;
+    if ( _sort_reverse ) {
+        // Engraved down arrow
+        fl_color(FL_WHITE);
+        fl_line(xrit, ytop, xctr, ybot);
+        fl_color(41);                   // dark gray
+        fl_line(xlft, ytop, xrit, ytop);
+        fl_line(xlft, ytop, xctr, ybot);
+    } else {
+        // Engraved up arrow
+        fl_color(FL_WHITE);
+        fl_line(xrit, ybot, xctr, ytop);
+        fl_line(xrit, ybot, xlft, ybot);
+        fl_color(41);                   // dark gray
+        fl_line(xlft, ybot, xctr, ytop);
+    }
+}
+
+// Handle drawing all cells in table
+void MyTable::draw_cell(TableContext context, int R, int C, int X, int Y, int W, int H) {
+    const char *s = ""; 
+    if ( R < (int)_rowdata.size() && C < (int)_rowdata[R].cols.size() )
+        s = _rowdata[R].cols[C]; 
+    switch ( context ) {
+        case CONTEXT_COL_HEADER:
+            fl_push_clip(X,Y,W,H); {
+                static const char *head[] = DIRHEADER; 
+                fl_draw_box(FL_THIN_UP_BOX, X,Y,W,H, FL_BACKGROUND_COLOR);
+                if ( C < 9 ) {
+		    fl_font(FL_HELVETICA_BOLD, 16);
+                    fl_color(FL_BLACK);
+                    fl_draw(head[C], X+2,Y,W,H, FL_ALIGN_LEFT, 0, 0);         // +2=pad left 
+                    // Draw sort arrow
+                    if ( C == _sort_lastcol ) {
+                        draw_sort_arrow(X,Y,W,H, _sort_reverse);
+                    }
+                }
+            }
+            fl_pop_clip();
+            return; 
+        case CONTEXT_CELL: {
+            fl_push_clip(X,Y,W,H); {
+                // Bg color
+                Fl_Color bgcolor = row_selected(R) ? selection_color() : FL_WHITE;
+                fl_color(bgcolor); fl_rectf(X,Y,W,H); 
+		fl_font(FL_HELVETICA, 16);
+                fl_color(FL_BLACK); fl_draw(s, X+2,Y,W,H, FL_ALIGN_LEFT);     // +2=pad left 
+                // Border
+                fl_color(FL_LIGHT2); fl_rect(X,Y,W,H);
+            }
+            fl_pop_clip();
+            return;
+        }
+        default:
+            return;
+    }
+}
+
+// Automatically set column widths to widest data in each column
+void MyTable::autowidth(int pad) {
+    fl_font(FL_COURIER, 16); 
+    // Initialize all column widths to lowest value
+    for ( int c=0; c<cols(); c++ ) col_width(c, pad);
+    for ( int r=0; r<(int)_rowdata.size(); r++ ) {
+        int w, h;
+        for ( int c=0; c<(int)_rowdata[r].cols.size(); c++ ) {
+            fl_measure(_rowdata[r].cols[c], w, h, 0);           // get pixel width of text
+            if ( (w + pad) > col_width(c)) col_width(c, w + pad);
+        }
+    }
+    table_resized();
+    redraw();
+}
+
+// Resize parent window to size of table
+void MyTable::resize_window() {
+    // Determine exact outer width of table with all columns visible
+    int width = 4;                                          // width of table borders
+    for ( int t=0; t<cols(); t++ ) width += col_width(t);   // total width of all columns
+    width += MARGIN*2;
+    if ( width < 200 || width > Fl::w() ) return;
+    window()->resize(window()->x(), window()->y(), width, window()->h());  // resize window to fit
+}
+
+// Load table with output of 'cmd'
+void MyTable::load_command(const char *cmd) {
+    char s[512];
+    FILE *fp = popen(cmd, "r");
+    cols(0);
+    for ( int r=0; fgets(s, sizeof(s)-1, fp); r++ ) {
+        // Add a new row
+        Row newrow; _rowdata.push_back(newrow);
+        std::vector<char*> &rc = _rowdata[r].cols;
+        // Break line into separate word 'columns'
+        char *ss;
+        const char *delim = " \t\n";
+        for(int t=0; (t==0)?(ss=strtok(s,delim)):(ss=strtok(NULL,delim)); t++) {
+            rc.push_back(strdup(ss));
+        }
+        // Keep track of max # columns
+        if ( (int)rc.size() > cols() ) {
+            cols((int)rc.size());
+        }
+    } 
+    // How many rows we loaded
+    rows((int)_rowdata.size()); 
+    // Auto-calculate widths, with 20 pixel padding
+    autowidth(20);
+}
+
+// Callback whenever someone clicks on different parts of the table
+void MyTable::event_callback(Fl_Widget*, void *data) {
+    MyTable *o = (MyTable*)data;
+    o->event_callback2();
+}
+
+void MyTable::event_callback2() {
+    //int ROW = callback_row();                 // unused
+    int COL = callback_col();
+    TableContext context = callback_context();
+    switch ( context ) {
+        case CONTEXT_COL_HEADER: {              // someone clicked on column header
+            if ( Fl::event() == FL_RELEASE && Fl::event_button() == 1 ) {
+                if ( _sort_lastcol == COL ) {   // Click same column? Toggle sort
+                    _sort_reverse ^= 1;
+                } else {                        // Click diff column? Up sort 
+                    _sort_reverse = 0;
+                }
+                sort_column(COL, _sort_reverse);
+                _sort_lastcol = COL;
+            }
+            break;
+        }
+        default:
+            return;
+    }
+}
+
+int main() {
+    Fl_Window win(900,500,"Table Sorting");
+        MyTable table(MARGIN, MARGIN, win.w()-MARGIN*2, win.h()-MARGIN*2);
+        table.selection_color(FL_YELLOW);
+        table.col_header(1);
+        table.col_resize(1);
+        table.when(FL_WHEN_RELEASE);            // handle table events on release
+        table.load_command(DIRCMD);             // load table with a directory listing
+        table.row_height_all(18);               // height of all rows
+	table.tooltip("Click on column headings to toggle column sorting");
+	table.color(FL_WHITE);
+    win.end();
+    win.resizable(table);
+    table.resize_window();
+    win.show();
+    return(Fl::run());
+}
+
+//
+// End of "$Id$".
+//