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//
// "$Id$"
//
// Demonstrate Fl_Tree custom item draw callback. - erco 11/09/2013
//
// Copyright 2013 Greg Ercolano.
// Copyright 1998-2016 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 <time.h> /* ctime.. */
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Tree.H>
#ifndef MAX
#define MAX(a,b) ((a)>(b))?(a):(b)
#endif
// DERIVE CUSTOM CLASS FROM Fl_Tree_Item TO IMPLEMENT SHOWING THE TIME OF DAY
// This demonstrates that item content can be dynamic and highly customized.
//
class MyTimeItem : public Fl_Tree_Item {
const char *time_format;
protected:
// Remove trailing crlf
const char* StripCrlf(char *s)
{ char *ss = strchr(s, '\n'); if (ss) *ss = 0; return s; }
const struct tm* GetTimeStruct() {
time_t t = time(NULL);
if ( strcmp(time_format, "Local") == 0 ) return localtime(&t);
if ( strcmp(time_format, "GMT" ) == 0 ) return gmtime(&t);
return 0;
}
public:
MyTimeItem(Fl_Tree *tree, const char *time_format) : Fl_Tree_Item(tree) {
label(time_format);
this->time_format = time_format;
}
// Handle custom drawing of the item
// Fl_Tree has already handled drawing everything to the left
// of the label area, including any 'user icon', collapse buttons,
// connector lines, etc.
//
// All we're responsible for is drawing the 'label' area of the item
// and it's background. Fl_Tree gives us a hint as to what the
// foreground and background colors should be via the fg/bg parameters,
// and whether we're supposed to render anything or not.
//
// The only other thing we must do is return the maximum X position
// of scrollable content, i.e. the right most X position of content
// that we want the user to be able to use the horizontal scrollbar
// to reach.
//
int draw_item_content(int render) {
Fl_Color fg = drawfgcolor();
Fl_Color bg = drawbgcolor();
// Show the date and time as two small strings
// one on top of the other in a single item.
//
// Our item's label dimensions
int X = label_x(), Y = label_y(),
W = label_w(), H = label_h();
// Render background
if ( render ) {
if ( is_selected() ) { // Selected? Use selectbox() style
fl_draw_box(prefs().selectbox(),X,Y,W,H,bg);
} else { // Not Selected? use plain filled rectangle
fl_color(bg); fl_rectf(X,Y,W,H);
}
}
// Render the label
if ( render ) {
fl_color(fg);
if ( label() ) fl_draw(label(), X,Y,W,H, FL_ALIGN_LEFT);
}
int lw=0, lh=0;
if ( label() ) {
lw=0; lh=0; fl_measure(label(), lw, lh);
}
X += lw + 8;
// Draw some red/grn/blu boxes
if ( render ) {
fl_color(FL_RED); fl_rectf(X+0, Y+2, 10, H-4);
fl_color(FL_GREEN); fl_rectf(X+10, Y+2, 10, H-4);
fl_color(FL_BLUE); fl_rectf(X+20, Y+2, 10, H-4);
}
X += 35;
// Render the date and time, one over the other
fl_font(labelfont(), 8); // small font
fl_color(fg);
const struct tm *tm = GetTimeStruct();
char s[80];
sprintf(s, "Date: %02d/%02d/%02d", tm->tm_mon+1, tm->tm_mday, tm->tm_year % 100);
lw=0, lh=0; fl_measure(s, lw, lh); // get box around text (including white space)
if ( render ) fl_draw(s, X,Y+4,W,H, FL_ALIGN_LEFT|FL_ALIGN_TOP);
sprintf(s, "Time: %02d:%02d:%02d", tm->tm_hour, tm->tm_min, tm->tm_sec);
if ( render ) fl_draw(s, X,Y+H/2,W,H/2, FL_ALIGN_LEFT|FL_ALIGN_TOP);
int lw2=0, lh2=0; fl_measure(s, lw2, lh2);
X += MAX(lw, lw2);
return X; // return right most edge of what we've rendered
}
};
// TIMER TO HANDLE DYNAMIC CONTENT IN THE TREE
void Timer_CB(void *data) {
Fl_Tree *tree = (Fl_Tree*)data;
tree->redraw(); // keeps time updated
Fl::repeat_timeout(0.2, Timer_CB, data);
}
int main(int argc, char *argv[]) {
Fl::scheme("gtk+");
Fl_Double_Window *win = new Fl_Double_Window(350, 400, "Tree Custom Draw Items");
win->begin();
{
// Create the tree
Fl_Tree *tree = new Fl_Tree(0, 0, win->w(), win->h());
tree->showroot(0); // don't show root of tree
tree->selectmode(FL_TREE_SELECT_MULTI); // multiselect
// Add some items
tree->add("Flintstones/Fred");
tree->add("Flintstones/Wilma");
tree->add("Flintstones/Pebbles");
{
MyTimeItem *myitem;
myitem = new MyTimeItem(tree, "Local"); // create custom item
myitem->labelsize(20);
tree->add("Time Add Item/Local", myitem);
myitem = new MyTimeItem(tree, "GMT"); // create custom item
myitem->labelsize(20);
tree->add("Time Add Item/GMT", myitem);
}
// 'Replace' approach
{
Fl_Tree_Item *item;
MyTimeItem *myitem;
item = tree->add("Time Replace Item/Local Time");
// Replace the 'Local' item with our own
myitem = new MyTimeItem(tree, "Local"); // create custom item
myitem->labelsize(20);
item->replace(myitem); // replace normal item with custom
item = tree->add("Time Replace Item/GMT Time");
// Replace the 'GMT' item with our own
myitem = new MyTimeItem(tree, "GMT"); // create custom item
myitem->labelsize(20);
item->replace(myitem); // replace normal item with custom
}
tree->add("Superjail/Warden");
tree->add("Superjail/Jared");
tree->add("Superjail/Alice");
tree->add("Superjail/Jailbot");
tree->show_self();
// Start with some items closed
tree->close("Superjail");
// Set up a timer to keep time in tree updated
Fl::add_timeout(0.2, Timer_CB, (void*)tree);
}
win->end();
win->resizable(win);
win->show(argc, argv);
return(Fl::run());
}
//
// End of "$Id$".
//
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