So for a Fl_Input you can set the when() as FL_WHEN_ENTER_KEY, then if you hit
the enter key, the callback for the input widget should run.
I tried that in a test program and it works. Thanks!
Can you clarify; I'm not clear what you are asking here, can you outline what
you are trying to achieve, then we can suggest some ways you might implement
that.
I am starting with a simple program to show a whole note on a staff with a
treble clef. The user is asked to enter the note name. The program should let
the user know if their input was correct and display a running score in the
window.
Here is the basic algorithm:
Display window with the following:
Instruction header - prompts user to enter note name.
staff and clef - (staff is drawn. clef and note are .png)
Loop {
note is shown on the staff - chosen randomly from a bank of locations.
User enters note name
Program checks user response, tabulates a score and prints a running score
to the window
}
User selects a quit button which destroys all dynamically allocated widgets.
Here is the code I have so far. It compiles and runs with my png files, but I
don't know how to:
1. Get the user's input to the window instead of the console.
I think I can send it to an output box, but I'd like to send
it to the window via an "invisible" box - sort of like the header.
2. Loop the sequence. I would also like to keep the code which checks the
answers separate from the code that implements the GUI.
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Return_Button.H>
#include <FL/Fl_Input.H>
#include <FL/Fl_Box.H>
#include <FL/fl_draw.H>
#include <FL/Fl_Shared_Image.H>
#include <FL/Fl_PNG_Image.H>
#include <iostream>
using namespace std;
// SIMPLE WIDGET THAT DRAWS A LINE
class DrawLINE : public Fl_Widget {
public:
DrawLINE(int X, int Y, int W, int H, const char*L=0) : Fl_Widget(X,Y,W,H,L)
{
}
void draw() {
// DRAW BLACK LINE
fl_color(FL_BLACK);
fl_line_style(FL_SOLID, 2);
int x1 = x(), y1 = y(), x2 = w(), y2 = h();
fl_line(x1, y1, x2, y2);
}// modified from G. Ercolano's cheatsheet (Draw an X)
}; // When this is resized it gets funky so I think I don't have it
// quite right...
class SimpleWindow : public Fl_Window{
public:
SimpleWindow(int w, int h, const char* title );
~SimpleWindow();
Fl_Input* inp;
Fl_Return_Button* entr;
Fl_Button* quit;
Fl_Box* header;
Fl_Box* noteBox;
Fl_Box* clefBox;
Fl_Box* comment;
const char* letters; // user response
Fl_PNG_Image* note;
Fl_PNG_Image* clef;
// DrawLINE pointers for drawing the staff
DrawLINE* line1;
DrawLINE* line2;
DrawLINE* line3;
DrawLINE* line4;
DrawLINE* line5;
DrawLINE* vert1;
DrawLINE* vert2;
DrawLINE* vert3;
private:
static void cb_getInfo(Fl_Widget*, void*);
inline void cb_getInfo_i();
static void cb_quit(Fl_Widget*, void*);
inline void cb_quit_i();
};
//----------------------------------------------------
int main (){
SimpleWindow win(400,400," Treble Clef Note Identification");
return Fl::run(); // I modified the window below from a beginner //fltk
tutorial.
// The problem I see is that implementation of the SimpleWindow looks
// like function main. I really don't want to attempt loops inside
// a class implementation
}
//--From what I understand it is better to have children of a window
// dynamically allocated so all the info can be passed via a pointer
// and all the children are destroyed when the parent is destroyed.
// Is this a correct assumption and good programming practice?
SimpleWindow::SimpleWindow(int w, int h, const char*
title):Fl_Window(w,h,title){
begin();
// Draw header
header = new Fl_Box(100, 20, 200, 30, "Type the note name in the
box\nbelow and hit enter.");
// Draw Staff
line1 = new DrawLINE(100, 100, 300, 100);
line2 = new DrawLINE(100, 110, 300, 110);
line3 = new DrawLINE(100, 120, 300, 120);
line4 = new DrawLINE(100, 130, 300, 130);
line5 = new DrawLINE(100, 140, 300, 140);
vert1 = new DrawLINE(300, 99, 300, 141);
vert2 = new DrawLINE(298, 99, 298, 141);
vert3 = new DrawLINE(292, 99, 292, 141);
fl_register_images(); // Register the images.
// Draw clef
clefBox = new Fl_Box(95, 80, 55, 85);
clef = new Fl_PNG_Image("tc75.png");
clefBox->image(clef);
// Draw note
noteBox = new Fl_Box(200, 101, 30, 30);
note = new Fl_PNG_Image("note.png");
noteBox->image(note);
entr = new Fl_Return_Button(100, 300, 80, 30, "Enter");
entr->callback( cb_getInfo, this );
quit = new Fl_Button(250, 300, 50, 30, "&Quit");
quit->callback(cb_quit, this);
inp = new Fl_Input(200, 190, 30, 30);
end();
show();
}
//----------------------------------------------------
SimpleWindow::~SimpleWindow(){}
//----------------------------------------------------
void SimpleWindow::cb_getInfo(Fl_Widget* o, void* v) {
( (SimpleWindow*)v )->cb_getInfo_i();
}
void SimpleWindow::cb_getInfo_i() {
letters = inp->value();
cout << "You typed " << letters << endl;
}
//----------------------------------------------------
void SimpleWindow::cb_quit(Fl_Widget* , void* v) {
( (SimpleWindow*)v )->cb_quit_i();
}
void SimpleWindow::cb_quit_i() {
hide();
}
I am open to any and all suggestions and I thank you for your time!
All best wishes,
Edgar Crockett
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