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GTK v1.2 Tutorial(英文)

来源:Linux-cn.com 作者:Webmaster 时间:2007-05-05 点击: [收藏] [投稿]


/* example-start paned paned.c */
#include <stdio.h>
#include <gtk/gtk.h>
/* Create the list of "messages" */
GtkWidget *create_list( void )
{
GtkWidget *scrolled_window;
GtkWidget *list;
GtkWidget *list_item;
int i;
char buffer[16];
/* Create a new scrolled window, with scrollbars only if needed */
scrolled_window = gtk_scrolled_window_new (NULL, NULL);
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_window),
GTK_POLICY_AUTOMATIC, 
GTK_POLICY_AUTOMATIC);
/* Create a new list and put it in the scrolled window */
list = gtk_list_new ();
gtk_scrolled_window_add_with_viewport (
 GTK_SCROLLED_WINDOW (scrolled_window), list);
gtk_widget_show (list);
/* Add some messages to the window */
for (i=0; i<10; i++) {
sprintf(buffer,"Message #%d",i);
list_item = gtk_list_item_new_with_label (buffer);
gtk_container_add (GTK_CONTAINER(list), list_item);
gtk_widget_show (list_item);
}
return scrolled_window;
}
/* Add some text to our text widget - this is a callback that is invoked
when our window is realized. We could also force our window to be
realized with gtk_widget_realize, but it would have to be part of
a hierarchy first */
void realize_text( GtkWidget *text,gpointer data )
{
gtk_text_freeze (GTK_TEXT (text));
gtk_text_insert (GTK_TEXT (text), NULL, &text->style->black, NULL,
"From: pathfinder@nasa.gov
"
"To: mom@nasa.gov
"
"Subject: Made it!
"
"
"
"We just got in this morning. The weather has been
"
"great - clear but cold, and there are lots of fun sights.
"
"Sojourner says hi. See you soon.
"
" -Path
", -1);
gtk_text_thaw (GTK_TEXT (text));
}
/* Create a scrolled text area that displays a "message" */
GtkWidget *create_text( void )
{
GtkWidget *table;
GtkWidget *text;
GtkWidget *hscrollbar;
GtkWidget *vscrollbar;
/* Create a table to hold the text widget and scrollbars */
table = gtk_table_new (2, 2, FALSE);
/* Put a text widget in the upper left hand corner. Note the use of
 * GTK_SHRINK in the y direction */
text = gtk_text_new (NULL, NULL);
gtk_table_attach (GTK_TABLE (table), text, 0, 1, 0, 1,
GTK_FILL | GTK_EXPAND,
GTK_FILL | GTK_EXPAND | GTK_SHRINK, 0, 0);
gtk_widget_show (text);
/* Put a HScrollbar in the lower left hand corner */
hscrollbar = gtk_hscrollbar_new (GTK_TEXT (text)->hadj);
gtk_table_attach (GTK_TABLE (table), hscrollbar, 0, 1, 1, 2,
GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_show (hscrollbar);
/* And a VScrollbar in the upper right */
vscrollbar = gtk_vscrollbar_new (GTK_TEXT (text)->vadj);
gtk_table_attach (GTK_TABLE (table), vscrollbar, 1, 2, 0, 1,
GTK_FILL, GTK_EXPAND | GTK_FILL | GTK_SHRINK, 0, 0);
gtk_widget_show (vscrollbar);
/* Add a handler to put a message in the text widget when it is realized */
gtk_signal_connect (GTK_OBJECT (text), "realize",
GTK_SIGNAL_FUNC (realize_text), NULL);
return table;
}
int main( int argc,
char *argv[] )
{
GtkWidget *window;
GtkWidget *vpaned;
GtkWidget *list;
GtkWidget *text;
gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "Paned Windows");
gtk_signal_connect (GTK_OBJECT (window), "destroy",
GTK_SIGNAL_FUNC (gtk_main_quit), NULL);
gtk_container_set_border_width (GTK_CONTAINER (window), 10);
gtk_widget_set_usize (GTK_WIDGET(window), 450, 400);
/* create a vpaned widget and add it to our toplevel window */
vpaned = gtk_vpaned_new ();
gtk_container_add (GTK_CONTAINER(window), vpaned);
gtk_paned_set_handle_size (GTK_PANED(vpaned),
 10);
gtk_paned_set_gutter_size (GTK_PANED(vpaned),
 15); 
gtk_widget_show (vpaned);
/* Now create the contents of the two halves of the window */
list = create_list ();
gtk_paned_add1 (GTK_PANED(vpaned), list);
gtk_widget_show (list);
text = create_text ();
gtk_paned_add2 (GTK_PANED(vpaned), text);
gtk_widget_show (text);
gtk_widget_show (window);
gtk_main ();
return 0;
}
/* example-end */

10.8 Viewports

  It is unlikely that you will ever need to use the Viewport widget directly. You are much more likely to use the Scrolled Window widget which itself uses the Viewport.

  A viewport widget allows you to place a larger widget within it such that you can view a part of it at a time. It uses Adjustments to define the area that is currently in view.

  A Viewport is created with the function


GtkWidget *gtk_viewport_new( GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment );

  As you can see you can specify the horizontal and vertical Adjustments that the widget is to use when you create the widget. It will create its own if you pass NULL as the value of the arguments.

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