button.c

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>
#include <ctype.h>
#include <errno.h>
#include <sys/time.h>
#define MWINCLUDECOLORS
#include <nano-X.h>
#include <nxcolors.h>
#include"button.h"


void InitWindows(WCB *wcb)
{
	
	if (GrOpen() < 0)
    {
        fprintf (stderr, "GrOpen failed");
        exit (1);
    }

    wcb->state = BUTTON_NOT_PRESSED;
	wcb->gc_main = GrNewGC();
	GrSetGCUseBackground (wcb->gc_main, GR_FALSE);
    GrSetGCForeground (wcb->gc_main, MAIN_WINDOW_COLOUR);

	wcb->gc_main_text = GrNewGC();
	GrSetGCBackground(wcb->gc_main_text, MAIN_WINDOW_COLOUR);
    GrSetGCForeground(wcb->gc_main_text, MAIN_WINDOW_TEXT_COLOUR);
	
	wcb->gc_button = GrNewGC();
    GrSetGCUseBackground (wcb->gc_button, GR_FALSE);
    GrSetGCForeground (wcb->gc_button, BUTTON_FOREGROUND_COLOUR);

	wcb->gc_button_text = GrNewGC();
    GrSetGCUseBackground (wcb->gc_button_text, GR_FALSE);
    GrSetGCForeground (wcb->gc_button_text, BUTTON_TEXT_COLOUR);

	wcb->wid_main = GrNewWindowEx(GR_WM_PROPS_APPFRAME|GR_WM_PROPS_CAPTION|\
		GR_WM_PROPS_CLOSEBOX, "Button Test win", GR_ROOT_WINDOW_ID, \
		MAIN_WINDOW_X_POSITION, MAIN_WINDOW_Y_POSITION, MAIN_WINDOW_WIDTH,\
		MAIN_WINDOW_HEIGHT, MAIN_WINDOW_COLOUR);

	wcb->wid_button = GrNewWindow(wcb->wid_main, BUTTON_X_POSITION, \
		BUTTON_Y_POSITION, BUTTON_WIDTH, BUTTON_HEIGHT, BUTTON_BOARDER,RED, GR_COLOR_BLACK);

	if(!(wcb->wid_main&&wcb->wid_button)) {
		fprintf(stderr, "Couldn't get a window\n");
		GrClose();
		exit(1);
	}
	
	GrSelectEvents(wcb->wid_main, GR_EVENT_MASK_EXPOSURE|\
		GR_EVENT_MASK_CLOSE_REQ);
	GrSelectEvents(wcb->wid_button, GR_EVENT_MASK_EXPOSURE|\
		GR_EVENT_MASK_CLOSE_REQ|GR_EVENT_MASK_BUTTON_DOWN);
	
	GrMapWindow (wcb->wid_main);
	GrMapWindow (wcb->wid_button);
}
/*
 * Draw a button which has a specified label string centered in it.
 */
void draw_Button(WCB* pwcb)
{
	GrFillRect(pwcb->wid_button, pwcb->gc_button, 0, 0,
			BUTTON_WIDTH, BUTTON_HEIGHT);
	GrText(pwcb->wid_button, pwcb->gc_button_text, BUTTON_TEXT_X_POSITION,
					BUTTON_TEXT_X_POSITION, "Click Me", -1, 0);
}

void draw_WinMain(WCB* pwcb)
{
	GrFillRect(pwcb->wid_main, pwcb->gc_main, 0, 0,
			MAIN_WINDOW_WIDTH, MAIN_WINDOW_HEIGHT);
	switch(pwcb->state)
	{
		case BUTTON_NOT_PRESSED:
			GrText (pwcb->wid_main, pwcb->gc_main_text, TEXT_X_POSITION, \
			TEXT_X_POSITION, "Hello World",  -1, GR_TFASCII);
			break;
		case BUTTON_PRESSED:
			GrText (pwcb->wid_main, pwcb->gc_main_text, TEXT_X_POSITION, \
			TEXT_X_POSITION, "Button is pressed",  -1, GR_TFASCII);
			break;
	}
}

void handle_exposure_event(WCB *pwcb)
{
	GR_EVENT_EXPOSURE *event = &pwcb->event.exposure;
	if(event->wid == pwcb->wid_main) {
		draw_WinMain(pwcb);
		return;
	}

	if(event->wid == pwcb->wid_button) {
		draw_Button(pwcb);
		return;
	}
}

void handle_mouse_event(WCB *wcb)
{
	GR_EVENT_BUTTON *event = &wcb->event.button;
	if(event->wid == wcb->wid_button) {
		wcb->state = BUTTON_PRESSED;
		draw_WinMain(wcb);
		return;
	}
}

void handle_event(WCB *wcb)
{    
	while(1) {
		GrGetNextEvent(&wcb->event);
		switch (wcb->event.type)    
		{    
			case GR_EVENT_TYPE_EXPOSURE:
				handle_exposure_event(wcb);
				break;
			case GR_EVENT_TYPE_BUTTON_DOWN:
				handle_mouse_event(wcb);
				break;
			case GR_EVENT_TYPE_CLOSE_REQ:
				GrClose();
				exit (0);
		}
	}
	
}

int main(int argc, char *argv[])
{
	int size;
	size = sizeof(WCB);
	WCB *pwcb = malloc(size);
	InitWindows(pwcb);
	handle_event(pwcb);

	return 0;
}