87 lines
2.5 KiB
Plaintext
87 lines
2.5 KiB
Plaintext
# data file for the Fltk User Interface Designer (fluid)
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version 1.0400
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header_name {.h}
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code_name {.cxx}
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comment {README FIRST
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- - - - - - -
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This fluid (.fl) file demonstrates how to create a complete
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FLTK program with a button with a virtual callback method
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and a virtual destructor.
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The code is as short as possible but demonstrates setting
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virtual and static attributes on callbacks.
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Note that FLTK needs static functions as callbacks assigned
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to widgets like Fl_Buttons. The static callback method can
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eventually call other class methods like the virtual callback
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method in this example.
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Use fluid interactively to open this fluid (.fl) file and
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double-click on items to see how they are defined.
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Hint: Open the code view (Edit/Show Source Code) and select
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items to see which code each item generates. Switch tabs
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'Source' and 'Header' in the code view window to see code in
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the source and header file, respectively.
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Use "File/Write Code" or 'fluid -c fluid-callback.fl' at
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the command line to generate .cxx and .h files; compile
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and build the demo program with
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fltk-config --compile fluid-callback.cxx
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} {in_source not_in_header
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}
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decl {\#include <FL/Fl_Window.H>} {public global
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}
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decl {\#include <FL/Fl_Button.H>} {public global
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}
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decl {\#include <stdio.h>} {public global
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}
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class App {open : Fl_Window
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} {
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Function {App(int X, int Y, const char *L) : Fl_Window(X, Y, L)} {
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comment Constructor open
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} {
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code {// Code in constructor
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printf("Creating new App\\n");
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Fl_Button *exit_cb = new Fl_Button(20, 20, 260, 60, "Exit: invokes virtual callback");
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exit_cb->callback(Cb_Bn_static, (void *)77);
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show();} {}
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}
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Function {~App()} {
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comment {Virtual destructor} open return_type virtual
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} {
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code {printf("Closing and deleting App\\n");} {}
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}
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Function {Cb_Bn_static(Fl_Widget *w, void *v)} {
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comment {Static callback method} open return_type {static void}
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} {
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code {// code in static callback
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int i = (int)(fl_intptr_t)v;
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printf("Executing static callback Cb_Bn_static, value = %d\\n", i);
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Fl_Window *win = w->window();
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App *app = (App *)win;
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app->Cb_Bn_virtual(v);} {}
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}
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Function {Cb_Bn_virtual(void *v)} {
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comment {// Virtual callback method} open return_type {virtual void}
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} {
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code {// code in virtual callback
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int i = (int)(fl_intptr_t)v;
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printf("Executing virtual callback Cb_Bn_virtual, value = %d\\n", i);
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// note: operator delete calls hide()
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delete this;} {}
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}
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}
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Function {} {open return_type int
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} {
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code {// Main program
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App(300, 100, "Virtual Callback Test");} {selected
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}
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}
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