状态栏、文本输入构件、组合框

### 状态栏 Statusbars 状态栏(Statusbars)是一些简单的构件，一般用来显示文本消息。它将文本消息压入到一个栈里面，当弹出当前消息时，将重新显示前一条文本消息。看下面具体的代码实现：  ~~~ /*File:statusbar.c *Date:2013-12-22 *Author:sjin *Mail:413977243@qq.com */ #include #include #include GtkWidget *status_bar; void push_item(GtkWidget *widget,gpointer data) { static int count = 1; char buf[20] = {'\0'}; g_snprintf(buf,20,"Item %d",count++); //将新消息加到状态栏 gtk_statusbar_push(GTK_STATUSBAR(status_bar),GPOINTER_TO_INT(data),buf); return; } void pop_item(GtkWidget *widget,gpointer data) { //删除在栈中给定上下文标识符最上面的一个消息 gtk_statusbar_pop(GTK_STATUSBAR(status_bar),GPOINTER_TO_INT(data)); return; } int main(int argc, char*argv[]) { GtkWidget *window; GtkWidget *button; GtkWidget *vbox; gint context_id; //初始化GTK gtk_init(&argc,&argv); //创建最上层主窗口 window = gtk_window_new(GTK_WINDOW_TOPLEVEL); //连接信号"delete_event",使得窗口关闭时发生 g_signal_connect(G_OBJECT(window),"delete_event",G_CALLBACK(gtk_main_quit),NULL); //设置窗口标题 gtk_window_set_title(GTK_WINDOW(window),"GTK 状态栏工具"); //设定窗口的默认宽高 //gtk_window_set_default_size(GTK_WINDOW(window),200,300); //设定窗口的位置,让窗口总在最前端 gtk_window_set_position(GTK_WINDOW(window),GTK_WIN_POS_CENTER); //设定容器边框的宽度 gtk_container_set_border_width(GTK_CONTAINER(window),20); vbox = gtk_vbox_new(FALSE,1); gtk_container_add(GTK_CONTAINER(window),vbox); gtk_widget_show(vbox); //创建一个状态栏 status_bar = gtk_statusbar_new(); gtk_box_pack_start(GTK_BOX(vbox),status_bar,TRUE,TRUE,0); gtk_widget_show(status_bar); //获得上下文的标识符 context_id = gtk_statusbar_get_context_id(GTK_STATUSBAR(status_bar),"Statusbar example"); button = gtk_button_new_with_label("push_item"); g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(push_item),GINT_TO_POINTER(context_id)); gtk_box_pack_start(GTK_BOX(vbox),button,TRUE,TRUE,2); gtk_widget_show(button); button = gtk_button_new_with_label("pop last item"); g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(pop_item),GINT_TO_POINTER(context_id)); gtk_box_pack_start(GTK_BOX(vbox),button,TRUE,TRUE,2); gtk_widget_show(button); gtk_widget_show_all(window); gtk_main(); return FALSE; } ~~~ ### 文本输入构件 Text Entries 文本输入构件(Entry widget)允许在一个单行文本框里输入和显示一行文本。文本可以用函数进行操作，如将新的文本替换、前插、追加到文本输入构件的当前内容中。  ~~~ /*File:text_entry.c *Date:2013-12-28 *Author:sjin *Mail:413977243@qq.com */ #include #include #include static GtkWidget* entry1; static GtkWidget* entry2; void on_button_clicked (GtkWidget* button,gpointer data) { /*void gtk_entry_set_text(Gtk_Entry *entry,const gchr *text) * 将新的内容取代文本输入构件当前的内容。 *const gchar *gtk_entry_get_text(GtkEntry *entry) * 获得当前文本输入构件的内容 */ if((int)data == 1){ gtk_entry_set_text(GTK_ENTRY(entry1),""); gtk_entry_set_text(GTK_ENTRY(entry2),""); } else if ((int)data == 2){ const gchar* username = gtk_entry_get_text(GTK_ENTRY(entry1)); const gchar* password = gtk_entry_get_text(GTK_ENTRY(entry2)); g_print("用户名是：%s",username); g_print("\n"); g_print("密码是：%s\n",password); } else if((int)data == 3){ /*改变文本空的可编辑状态*/ gtk_editable_set_editable(GTK_EDITABLE(entry1),GTK_TOGGLE_BUTTON(button)->active); gtk_editable_set_editable(GTK_EDITABLE(entry2),GTK_TOGGLE_BUTTON(button)->active); } } int main(int argc,char* argv[]) { GtkWidget* window; GtkWidget* box; GtkWidget* box1; GtkWidget* box2; GtkWidget* box3; GtkWidget* label1; GtkWidget* label2; GtkWidget* button; GtkWidget* sep; //初始化 gtk_init(&argc,&argv); //设置窗口 window = gtk_window_new(GTK_WINDOW_TOPLEVEL); g_signal_connect(G_OBJECT(window),"destroy",G_CALLBACK(gtk_main_quit),NULL); gtk_window_set_title(GTK_WINDOW(window),"登录窗口"); gtk_window_set_position(GTK_WINDOW(window),GTK_WIN_POS_CENTER); gtk_container_set_border_width(GTK_CONTAINER(window),20); box = gtk_vbox_new(FALSE,0); gtk_container_add(GTK_CONTAINER(window),box); box1 = gtk_hbox_new(FALSE,0); gtk_box_pack_start(GTK_BOX(box),box1,FALSE,FALSE,5); box2 = gtk_hbox_new(FALSE,0); gtk_box_pack_start(GTK_BOX(box),box2,FALSE,FALSE,5); sep = gtk_hseparator_new();//分割线 gtk_box_pack_start(GTK_BOX(box),sep,FALSE,FALSE,5); box3 = gtk_hbox_new(FALSE,0); gtk_box_pack_start(GTK_BOX(box),box3,TRUE,TRUE,5); label1 = gtk_label_new("用户名："); entry1 = gtk_entry_new(); gtk_box_pack_start(GTK_BOX(box1),label1,FALSE,FALSE,5); gtk_box_pack_start(GTK_BOX(box1),entry1,FALSE,FALSE,5); label2 = gtk_label_new("密 码："); entry2 = gtk_entry_new(); /*设置输入文本不可见*/ gtk_entry_set_visibility(GTK_ENTRY(entry2),FALSE); gtk_box_pack_start(GTK_BOX(box2),label2,FALSE,FALSE,5); gtk_box_pack_start(GTK_BOX(box2),entry2,FALSE,FALSE,5); button = gtk_check_button_new_with_label("Editable"); g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_button_clicked),(gpointer)3); gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button),TRUE); gtk_box_pack_start(GTK_BOX(box3),button,TRUE,TRUE,10); gtk_widget_show(button); button = gtk_button_new_with_label("清空"); g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_button_clicked),(gpointer)1); gtk_box_pack_start(GTK_BOX(box3),button,TRUE,TRUE,10); gtk_widget_show(button); button = gtk_button_new_with_label("确认"); g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_button_clicked),(gpointer)2); g_signal_connect_swapped(G_OBJECT(button),"clicked",G_CALLBACK(gtk_widget_destroy),window); gtk_box_pack_start(GTK_BOX(box3),button,TRUE,TRUE,5); gtk_widget_show(button); gtk_widget_show_all(window); gtk_main(); return FALSE; } ~~~ ### 组合框 Combo Box 组合框(combo box)是另一个很简单的构件，实际上它仅仅是其它构件的集合。从用户的观点来说，这个构件是由一个文本输入构件和一个下拉菜单组成的，用户可以从一个预先定义的列表里面选择一个选项，同时，用户也可以直接在文本框里面输入文本.  ~~~ #include void callback(GtkWidget *button,gpointer data) { printf("组合框发生改变\n"); if((int)data == 1){ gchar *ptr = gtk_entry_get_text(GTK_ENTRY(button)); printf("组合框A发生改变，内容是：%s\n",ptr); }else if((int)data == 2) { gchar *ptr = gtk_entry_get_text(GTK_ENTRY(button)); printf("组合框A发生改变，内容是：%s\n",ptr); } } GtkWidget *create_item (gint i) { GtkWidget *item; GtkWidget *label; GtkWidget *hbox; GtkWidget *image; hbox = gtk_hbox_new(FALSE,0); switch(i){ case 1: image = gtk_image_new_from_stock(GTK_STOCK_YES,GTK_ICON_SIZE_MENU); label = gtk_label_new("列表项一"); break; case 2: image = gtk_image_new_from_stock(GTK_STOCK_NO,GTK_ICON_SIZE_MENU); label = gtk_label_new("列表项二"); break; case 3: image = gtk_image_new_from_stock(GTK_STOCK_HELP,GTK_ICON_SIZE_MENU); label = gtk_label_new("列表项三"); break; case 4: image = gtk_image_new_from_stock(GTK_STOCK_OK,GTK_ICON_SIZE_MENU); label = gtk_label_new("列表项四"); break; case 5: image = gtk_image_new_from_stock(GTK_STOCK_CANCEL,GTK_ICON_SIZE_MENU); label = gtk_label_new("列表项五"); break; } gtk_box_pack_start(GTK_BOX(hbox),image,FALSE,FALSE,2); gtk_box_pack_start(GTK_BOX(hbox),label,FALSE,FALSE,2); item = gtk_list_item_new(); gtk_container_add(GTK_CONTAINER(item),hbox); gtk_widget_show_all(item); return item; } int main(int argc,char* argv[]) { GtkWidget *window; GtkWidget *combo; GtkWidget *label; GtkWidget *vbox; GList *items = NULL; GtkWidget *item; items =g_list_append(items,"列表项A"); items =g_list_append(items,"列表项B"); items =g_list_append(items,"列表项C"); items =g_list_append(items,"列表项D"); items =g_list_append(items,"列表项E"); gtk_init(&argc,&argv); window = gtk_window_new(GTK_WINDOW_TOPLEVEL); g_signal_connect(G_OBJECT(window),"delete_event",G_CALLBACK(gtk_main_quit),NULL); gtk_window_set_title(GTK_WINDOW(window),"下拉列表框"); gtk_window_set_position(GTK_WINDOW(window),GTK_WIN_POS_CENTER); gtk_container_set_border_width(GTK_CONTAINER(window),20); vbox = gtk_vbox_new(FALSE,0); gtk_container_add(GTK_CONTAINER(window),vbox); label = gtk_label_new("组合框A"); gtk_box_pack_start(GTK_BOX(vbox),label,FALSE,FALSE,5); combo = gtk_combo_new(); gtk_box_pack_start(GTK_BOX(vbox),combo,FALSE,FALSE,5); gtk_combo_set_popdown_strings(GTK_COMBO(combo),items); g_signal_connect(G_OBJECT(GTK_COMBO(combo)->entry),"changed",G_CALLBACK(callback),(gpointer)1); /************另一种创建的方式****************/ label = gtk_label_new("组合框B"); gtk_box_pack_start(GTK_BOX(vbox),label,FALSE,FALSE,5); combo = gtk_combo_new(); gtk_box_pack_start(GTK_BOX(vbox),combo,FALSE,FALSE,5); item = create_item(1); gtk_combo_set_item_string(GTK_COMBO(combo),GTK_ITEM(item),"项目一"); gtk_container_add(GTK_CONTAINER(GTK_COMBO(combo)->list),item); item = create_item(2); gtk_combo_set_item_string(GTK_COMBO(combo),GTK_ITEM(item),"项目二"); gtk_container_add(GTK_CONTAINER(GTK_COMBO(combo)->list),item); item = create_item(3); gtk_combo_set_item_string(GTK_COMBO(combo),GTK_ITEM(item),"项目三"); gtk_container_add(GTK_CONTAINER(GTK_COMBO(combo)->list),item); item = create_item(4); gtk_combo_set_item_string(GTK_COMBO(combo),GTK_ITEM(item),"项目四"); gtk_container_add(GTK_CONTAINER(GTK_COMBO(combo)->list),item); item = create_item(5); gtk_combo_set_item_string(GTK_COMBO(combo),GTK_ITEM(item),"项目五"); gtk_container_add(GTK_CONTAINER(GTK_COMBO(combo)->list),item); g_signal_connect(G_OBJECT(GTK_COMBO(combo)->entry),"changed",G_CALLBACK(callback),(gpointer)2); gtk_widget_show_all(window); gtk_main(); return FALSE; } ~~~