#include <gtk/gtk.h>

#include <stdlib.h>

/*创建一个指向GtkWidget类型的指针（创建文本框使用）*/

static GtkWidget *entry;

/*创建全局变量:名为“fnum”（双精度，第一个输入量）；

“snum”（双精度，第二个输入量）*/

gdouble fnum = 0;

gdouble snum = 0;

/*创建全局控制变量：名为“num_count”（整型，控制输入位数）；

“operator”（整型，控制输入的运算符号）；

“first_num”（布尔型，控制输入的次数）；

“have_result”(布尔型，为重新进行计算作好准备)*/

gint num_count =0;

gint operator = 0;

gboolean first_num = TRUE;

//gboolean first_num_equal = FALSE;

gboolean have_dot = FALSE; //小数点

gboolean have_result = FALSE;

gchar number[100];

/*........................................................................ */

//清除函数：ClearReset（）

//1：清除屏幕上的内容（TURE）;2：初始化变量并清屏（FALSE）

void ClearReset(gboolean clear_only)

{

/*初始化number[100]等，分配内存空间*/

gint i = 0;

for(i = 0;i<100;i++)

number[i] = '\0';

fnum = 0;

snum = 0;

operator = 0;

num_count = 0;

first_num = TRUE;

have_dot = FALSE;

have_result = FALSE;

//first_num_equal = FALSE;

/*清除屏幕*/

if(clear_only = TRUE)

gtk_entry_set_text(GTK_ENTRY(entry),"0");

}

/*---------------------------------------------------------------------------------- */

//按下数字时的回调函数：PressNum（）

void PressNum(GtkButton *button,gpointer data)

{

/*创建一个指向字符的指针变量："num"(用来操作输入量)*/

const gchar *num;

int i;

/*控制输入数字的位数*/

if(num_count == 9)

return;

/*输入位数记数*/

num_count++;

/*通过button的label获取每次输入的数值（字符串型）*/

num=gtk_button_get_label(GTK_BUTTON(button));

/*g_strlcat() 可以用来组合每次输入数字（字符串）起到累加作用*/

i=g_strlcat(number,num,100);

/*输入第一个数和第二个数的控制开关,strtod()是把字符串转换为gdouble型*/

if(first_num )

{

/*第一次输入*/

fnum=strtod(number,NULL);

}

else

{

/*第二次输入*/

/*防止除法时除数为0*/

if(num_count == 1);

snum=strtod(number,NULL);

if(num_count == 1 && operator ==4 && snum == 0)

//gtk_entry_set_text(GTK_ENTRY(entry),"ERROR");

return;

}

if (number[0]=='0' && number[1]!='.' &&num_count>=2 )

{

gint i;

for (i =0 ; i<100; i++)

{

number[i] = number[i+1];

}

}

/*把输入的数字显示出来*/

gtk_entry_set_text(GTK_ENTRY(entry),number);

//g_print("F:%f\n",fnum);

//g_print("S:%f\n",snum);

}

/*----------------------------------------------------------------------------------*/

//按下小数点时的回调函数：PressDot（）

void PressDot(GtkButton *button,gpointer data)

{

gint i;

/*重复计算的切换开关*/

if(have_result)

ClearReset(FALSE);

/*如果小数点在第一位则不显示*/

if(num_count == 0)

{

ClearReset(TRUE);

return;

}

/*把数加上小数点进行显示.have_dot防止输入两次小数点*/

if(have_dot == FALSE)

{

have_dot = TRUE;

i=g_strlcat(number,".",100);

if(first_num)

/*第一个数字输入*/

fnum=strtod(number,NULL);

else

{

/*第二个数字输入*/

snum=strtod(number,NULL);

/*把输入的数字显示出来*/

gtk_entry_set_text(GTK_ENTRY(entry),number);

}

}

}

/*------------------------------------------------------------------------------------*/

//按下清零键时的回调函数：PressClear（）

void PressClear(GtkButton *button,gpointer data)

{

ClearReset(FALSE);

}

/*------------------------------------------------------------------------------------*/

//按下运算符时的回调函数：PressOperator（）

void PressOperator(GtkButton *button,gpointer data)

{

gint i;

switch(GPOINTER_TO_INT(data))

{

case 1: operator = 1;//加法

break;

case 2: operator = 2;//减法

break;

case 3: operator = 3;//乘法

break;

case 4: operator = 4;//除法

break;

}

// g_print("F:%f\n",fnum);

// g_print("S:%f\n",snum);

/*切换输入第二个数*/

first_num = FALSE;

num_count = 0;

have_dot =FALSE;

for( i = 0;i<100;i++)

number[i] = '\0';

}

/*-------------------------------------------------------------------------------------*/

//按下等于号时的回调函数：PressEqual（）

void PressEqual(GtkButton *button,gpointer data)

{

gdouble numb;

gchar *result;

gchar num[100];

gint e = 0;

g_print("F:%f\n",fnum);

g_print("S:%f\n",snum);

/*进行运算*/

switch(operator)

{

case 1: numb = fnum + snum ;

break;

case 2: numb = fnum - snum;

break;

case 3: numb = fnum * snum;

break;

case 4: numb = fnum / snum;

break;

//防一开始什么也不按，就按一个= 会档机的问题

default: gtk_entry_set_text(GTK_ENTRY(entry),number);

e = 1;

break;

}

if (e==0)

{ /*把结果转换成字符串*/

result = g_ascii_dtostr(num,100,numb);

fnum = numb;

//输出结果

gtk_entry_set_text(GTK_ENTRY(entry),result);

have_result=TRUE;

//first_num_equal = TRUE;

}

/*

result = g_ascii_dtostr(num,100,numb);

fnum = numb;

gtk_entry_set_text(GTK_ENTRY(entry),result);

have_result=TRUE;

first_num_equal = TRUE; */

}

/*-------------------------------------------------------------------------------------*/

//主函数:main()

int main(int argc,char* argv[])

{

/*创建指向GtkWidget类型的指针*/

GtkWidget *window;

GtkWidget *button;

GtkWidget *vbox;

GtkWidget *hbox;

GtkWidget *table;

GtkBuilder *builder = NULL;

/*初始化*/

gtk_init(&argc,&argv);

builder=gtk_builder_new();

gtk_builder_add_from_file(builder,"counter.glade",NULL);

gtk_builder_connect_signals(builder, NULL);

// 根据 ID 获取子构件

window=GTK_WIDGET(gtk_builder_get_object(builder,"window"));

entry=GTK_ENTRY(gtk_builder_get_object(builder,"entry"));

gtk_entry_set_text(GTK_ENTRY(entry),"0");

gtk_editable_set_editable(GTK_EDITABLE(entry),FALSE);

gtk_widget_set_direction(entry,GTK_TEXT_DIR_RTL);

// text = GTK_LABEL(gtk_builder_get_object(builder, "label-main"));

button=GTK_BUTTON(gtk_builder_get_object(builder, "button1"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressClear),NULL);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button2"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressNum),NULL);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button3"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressNum),NULL);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button4"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressNum),NULL);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button5"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressOperator),(gpointer)1);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button6"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressNum),NULL);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button7"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressNum),NULL);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button8"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressNum),NULL);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button9"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressOperator),(gpointer)2);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button10"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressNum),NULL);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button11"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressNum),NULL);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button12"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressNum),NULL);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button13"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressOperator),(gpointer)3);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button14"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressNum),NULL);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button15"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressDot),NULL);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button16"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressEqual),NULL);

button=GTK_BUTTON(gtk_builder_get_object(builder, "button17"));

g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(PressOperator),(gpointer)4);

// 获取到 UI 对象后，GtkBuilder 对象已没有作用，释放了

g_object_unref(G_OBJECT(builder));

gtk_widget_show_all(window);

gtk_main();

return 0;

}