Gtk+-3.0实例4.使用GtkGrid和GtkTable制作简单计算器界面

原创于 2023-02-07 16:52:05 发布 · 763 阅读

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本文提供了一个使用GtkGrid在C语言中创建简单计算器界面的实例。代码通过gtk_grid_attach函数布局按钮，实现网格中的按钮排列。程序创建一个4x4的网格，并填充数字和运算符按钮。

Gtk+-3.0实例4.使用GtkGrid和GtkTable制作简单计算器界面

１.代码说明
2.源码如下
3.运行结果

１.代码说明

GtkTable的创建与使用
GtkGrid的创建与使用
主要函数说明

//Adds a widget to the grid.
void
gtk_grid_attach (GtkGrid *grid,
                 GtkWidget *child,
                 gint left,
                 gint top,
                 gint width,
                 gint height);

参数说明
子构件child的位置由left 和 top的值决定，每个子构件，这里主要指网格中的每个按钮所占网格 “cells” 的数量由width 和 height决定 .
grid：a GtkGrid　网格部件
child：the widget to add　网格中要添加的小部件
left：the column number to attach the left side of child to 小部件左侧关联的列号
top：the row number to attach the top side of child to　小部件顶部关联的行号
width：the number of columns that child will span　小部件所占列的数量
height：the number of rows that child will span　小部件所占行的数量

2.源码如下

//buttons with table/grid in window (calculator.c)
#include <gtk/gtk.h>

int main (int argc,char *argv[])
{
	GtkWidget *window;
	//GtkWidget *table;
	GtkWidget *grid;
	GtkWidget *button;

	gchar *values[16]={"7","8","9","/",
					   "4","5","6","*",
					   "1","2","3","-",
					   "0",".","=","+",};
	
	gtk_init (&argc, &argv);
	
	window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
	//gtk_window_set_title (GTK_WINDOW (window), "Calculator in GtkTable");
	gtk_window_set_title (GTK_WINDOW (window), "Calculator in GtkGrid");
	gtk_window_set_default_size (GTK_WINDOW(window),260,180);
	gtk_container_set_border_width (GTK_CONTAINER (window), 5);
	gtk_window_set_position (GTK_WINDOW (window),GTK_WIN_POS_CENTER_ALWAYS);

	//从gtk3.4开始，已放弃使用GtkTable,建议使用GtkGrid,但该小部件目前仍能使用
	//table=gtk_table_new (4,4,TRUE);
	//gtk_table_set_row_spacing (GTK_TABLE(table),4,2);
	//gtk_table_set_col_spacing (GTK_TABLE(table),4,2);

	grid=gtk_grid_new ();
	gtk_grid_set_row_spacing (GTK_GRID(grid),2);
	gtk_grid_set_column_spacing (GTK_GRID(grid),2);

	gint pos=0;
	for(gint i=0;i<4;i++)
		for(gint j=0;j<4;j++)
		{
			button=gtk_button_new_with_label(values[pos]);
			gtk_widget_set_hexpand (button, TRUE);
			gtk_widget_set_vexpand (button, TRUE);
			//gtk_table_attach_defaults (GTK_TABLE(table),button,j,j+1,i,i+1);
			gtk_grid_attach(GTK_GRID(grid),button,i,j,1,1);
			pos++;
		}
	
	g_signal_connect (G_OBJECT (window), "destroy",
	                  G_CALLBACK (gtk_main_quit), G_OBJECT(window));
	
	//gtk_container_add (GTK_CONTAINER (window), table);
	gtk_container_add (GTK_CONTAINER (window), grid);
	gtk_widget_show_all(window);
	gtk_main ();
	return 0;
}