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]

9.2 Arrows

　　The Arrow widget draws an arrowhead, facing in a number of possible directions and having a number of possible styles. It can be very useful when placed on a button in many applications. Like the Label widget, it emits no signals.

　　There are only two functions for manipulating an Arrow widget:


GtkWidget *gtk_arrow_new( GtkArrowType arrow_type,
GtkShadowTypeshadow_type );
void gtk_arrow_set( GtkArrow*arrow,
GtkArrowType arrow_type,GtkShadowTypeshadow_type );

　　The first creates a new arrow widget with the indicated type and appearance. The second allows these values to be altered retrospectively. The arrow_type argument may take one of the following values:

　　GTK_ARROW_UP

　　GTK_ARROW_DOWN

　　GTK_ARROW_LEFT

　　GTK_ARROW_RIGHT

　　These values obviously indicate the direction in which the arrow will point. The shadow_type argument may take one of these values:

　　GTK_SHADOW_IN

　　GTK_SHADOW_OUT (the default)

　　GTK_SHADOW_ETCHED_IN

　　GTK_SHADOW_ETCHED_OUT

　　Here's a brief example to illustrate their use.


/* example-start arrow arrow.c */
#include <gtk/gtk.h>
/* Create an Arrow widget with the specified parameters
 * and pack it into a button */
GtkWidget *create_arrow_button( GtkArrowTypearrow_type,
GtkShadowType shadow_type )
{
GtkWidget *button;
GtkWidget *arrow;
button = gtk_button_new();
arrow = gtk_arrow_new (arrow_type, shadow_type);
gtk_container_add (GTK_CONTAINER (button), arrow);
gtk_widget_show(button);
gtk_widget_show(arrow);
return(button);
}
int main( int argc,
char *argv[] )
{
/* GtkWidget is the storage type for widgets */
GtkWidget *window;
GtkWidget *button;
GtkWidget *box;
/* Initialize the toolkit */
gtk_init (&argc, &argv);
/* Create a new window */
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "Arrow Buttons");
/* It's a good idea to do this for all windows. */
gtk_signal_connect (GTK_OBJECT (window), "destroy",
GTK_SIGNAL_FUNC (gtk_main_quit), NULL);
/* Sets the border width of the window. */
gtk_container_set_border_width (GTK_CONTAINER (window), 10);
/* Create a box to hold the arrows/buttons */
box = gtk_hbox_new (FALSE, 0);
gtk_container_set_border_width (GTK_CONTAINER (box), 2);
gtk_container_add (GTK_CONTAINER (window), box);
/* Pack and show all our widgets */
gtk_widget_show(box);
button = create_arrow_button(GTK_ARROW_UP, GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (box), button, FALSE, FALSE, 3);
button = create_arrow_button(GTK_ARROW_DOWN, GTK_SHADOW_OUT);
gtk_box_pack_start (GTK_BOX (box), button, FALSE, FALSE, 3);
button = create_arrow_button(GTK_ARROW_LEFT, GTK_SHADOW_ETCHED_IN);
gtk_box_pack_start (GTK_BOX (box), button, FALSE, FALSE, 3);
button = create_arrow_button(GTK_ARROW_RIGHT, GTK_SHADOW_ETCHED_OUT);
gtk_box_pack_start (GTK_BOX (box), button, FALSE, FALSE, 3);
gtk_widget_show (window);
/* Rest in gtk_main and wait for the fun to begin! */
gtk_main ();
return(0);
}
/* example-end */

9.3 The Tooltips Object

　　These are the little text strings that pop up when you leave your pointer over a button or other widget for a few seconds. They are easy to use, so I will just explain them without giving an example. If you want to see some code, take a look at the testgtk.c program distributed with GTK.

　　Widgets that do not receive events (widgets that do not have their own window) will not work with tooltips.

　　The first call you will use creates a new tooltip. You only need to do this once for a set of tooltips as the GtkTooltips object this function returns can be used to create multiple tooltips.


GtkTooltips *gtk_tooltips_new( void );

　　Once you have created a new tooltip, and the widget you wish to use it on, simply use this call to set it:


void gtk_tooltips_set_tip( GtkTooltips *tooltips,
GtkWidget *widget,const gchar *tip_text,const gchar *tip_private );

　　The first argument is the tooltip you've already created, followed by the widget you wish to have this tooltip pop up for, and the text you wish it to say. The last argument is a text string that can be used as an identifier when using GtkTipsQuery to implement context sensitive help. For now, you can set it to NULL.

　　Here's a short example:

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