A string entry widget is a widget that lets a user enter a single line of ASCII text. When the user presses return in the widget, a callback is made to your application with a pointer to the new text. Support routines also exist to Set and Get the text in the widget.
If you want multiple lines of text, see the text edit widget documentation.
Widget MakeStringEntry(char *txt, int size, StringCB func, void *data);
This function makes a string input widget. A string input widget is a widget that lets a user enter/edit a single line string value such as a filename.
The first argument is any default text you would like in the string entry widget. You can specify NULL or "" if you don't want anything to appear.
The next argument is the width in pixels of the string entry area. Be careful in specifying the width since the default font used by the widget may not be wide enough to contain the text you want. It is best if you call GetWidgetFont() and then call TextWidth() on a string of reasonable length and use the value returned by TextWidth() to be the width of the widget. If you're lazy, a value of 150-200 is usually pretty good.
The next argument is a callback function that is called whenever the user presses return in the string entry widget. The callback function should be declared as follows:
void func(Widget w, char *string, void *data)
{
}
The first argument to the callback is the widget where the user pressed return. For the most part you can ignore this (unless you want to change the text). The second argument is a pointer to the string of text the user entered. The final argument is the user data pointer you passed in to MakeStringEntry() .
The string of text passed to your callback function should be copied elsewhere (using strdup() if necessary) because it is internal to the widget. The string passed to your callback function should never be modified directly. Also, do not just store the value of the pointer in some global variable. The memory pointed to by the string is private to the widget and should be copied if you want to preserve it.
SEE ALSO : SetStringEntry() , GetStringEntry() , SetWidgetPos() , GetWidgetFont() , TextWidth() , SetWidgetFont() , SetFgColor() , SetBgColor() , SetBorderColor()
This function allows you to change the string of text displayed in a string entry widget.
The first argument is the widget in which you would like to change the string (this widget should be a string entry widget). The second argument is a pointer to the new text you would like displayed in the string entry area.
After calling this function, the new text is displayed in the string entry area and any old strings are gone.
SEE ALSO : GetStringEntry() , MakeStringEntry() ,
char *GetStringEntry(Widget w)
This function lets you retrieve the text a user entered in a string widget. The widget argument, w, should be a string entry widget.
The return value of this function is a char pointer to a null-terminated string that is the contents of the string entry widget. This pointer is valid until the next time you call GetStringEntry() or the string widget callback is called. Do not save the pointer returned by this function as it points to widget internal data. You should make a copy of the string with strdup() if you want to save the value.
If there is a problem, the function returns NULL.
NOTE: You should not free the string returned to you by this function. If you need to modify the string or otherwise use, you should make a copy with strdup() or some other method.
SEE ALSO : SetStringEntry() , MakeStringEntry() ,