GTK Dialog中的Combobox为什么点击不能打开列表？

发布于 2022-07-29 05:58:00 字数 147 浏览 11 评论 1

Dialog中包含一个Combobox，设置对话框属性为modal时，鼠标点击combobox不能展开下拉列表，
如果去掉gtk_window_set_modal(GTK_WINDOW(dialog),TRUE);则点击鼠标可以展开列表。
不知是什么原因，请指点，谢谢！

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苍白女子 2022-08-09 01:14:17

I use the function gtk_dialog_new() crate a modal dialog(for more information about dialogs, please see Gtk 2.0 reference manual), and then add a combobox widget to a sub widget of the dialog I created. the following is a source code which shows how to create a modal dialog with combobox.
我使用gtk_dialog_new() 函数创建一个模态对话框(要更多关于对话框的帮助,可以查看Gtk2.0参考手册),然后添加一个组合框控件到我创建的子控件里面.下面是一份创建带有组合框控件的模态对话框的源码.

#include <gtk/gtk.h>

/*
* Function:CreateSubWindow
* Description:Create a modal window
* Parameter:None
* Returns:A pointer to a modal window widget
*/
GtkWidget* CreateModalWindow()
{
GList* e_nation_items = NULL;
GtkWidget* e_nation_combo;
GtkWidget* subwindow = gtk_dialog_new();
gtk_window_set_title (GTK_WINDOW (subwindow), "this is a modal window with a combobox control");
gtk_widget_set_usize(GTK_WIDGET(subwindow), 300, 120);
gtk_window_set_modal(GTK_WINDOW(subwindow), TRUE);
g_signal_connect(G_OBJECT(subwindow), "destroy", G_CALLBACK(gtk_main_quit), subwindow);

e_nation_items = g_list_append(e_nation_items, "High");
  e_nation_items = g_list_append(e_nation_items, "Middle");
  e_nation_items = g_list_append(e_nation_items, "Low");
  e_nation_combo = gtk_combo_new();
  gtk_combo_set_popdown_strings(GTK_COMBO(e_nation_combo), e_nation_items);
  gtk_box_pack_start(GTK_BOX(GTK_DIALOG(subwindow)->vbox), e_nation_combo, TRUE, TRUE, 0);
return subwindow;
}

/*
* Function:on_button_press_event
* Description: call back funtion of the button press event
* Returns: TRUE if the mouse right button be clicked, otherwise, retuns FALSE
*/
gboolean on_button_press_event(GtkWidget *widget, GdkEventButton *event)
{
if (event-> button == 1)
{
gtk_widget_show_all( CreateModalWindow() );
return TRUE;
}
return FALSE;
}

int main( int argc, char *argv[] )
{
  GtkWidget *window;
  GtkWidget *button;
  GtkWidget *menu_items;
  gtk_init (&argc, &argv);

  /* create a new window */
  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title (GTK_WINDOW (window), "GTK Radio Menu Item Test");
  gtk_widget_set_usize(GTK_WIDGET(window), 500, 300);
  g_signal_connect (G_OBJECT (window), "delete_event", G_CALLBACK (gtk_main_quit), NULL);
  gtk_window_set_modal(GTK_WINDOW(window), TRUE);

  button = gtk_button_new_with_label("click here to display a modal window with combobox control ");
  g_signal_connect (G_OBJECT (button), "button_press_event",G_CALLBACK (on_button_press_event), NULL);
gtk_container_add(GTK_CONTAINER(window), button);

  /* display the window */
  gtk_widget_show_all (window);
  gtk_main ();
  return 0;
}