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<B> Next: <A NAME="tex2html88"
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<H1><A NAME="SECTION00070000000000000000">
7 Adding a button in the window</A>
</H1>
We now want to complete implementing the program of the previous
tutorial using GNUstep Renaissance: we want to add a button to the
window; clicking the button should print <TT>Hello!</TT> on the
console.
<P>
Adding the button is just a matter of modifying our
<TT>Window.gsmarkup</TT> file, so that it doesn't create the window
empty, but with a button inside it:
<PRE>
<gsmarkup>
<objects>
<window title="This is a test window" closable="no">
<button title="Print Hello!" action="printHello:" target="#NSOwner" />
</window>
</objects>
</gsmarkup>
</PRE>
Because the <TT><button></TT> tag is inside the <TT><window></TT> tag,
the button will be created inside the window. The button will be
created with title <TT>Print Hello!</TT>, and when you click on it,
the method <TT>printHello:</TT> of the object ``<TT>#NSOwner</TT>''
will be called.
<P>
The syntax <TT>#NSOwner</TT> in gsmarkup files is special, and means
``the file owner''. The file owner is the object which is passed as
an argument to the <TT>loadGSMarkupNamed:owner:</TT> method when
loading the file, and normally is used to connect together the objects
in the interfaces created by a gsmarkup file, to the rest of your
application. We have passed the application delegate (an object of a
class implemented by us) as the file owner in our examples, which is a
reasonably good choice in this situation, since we can add custom
methods to it, and call them from the interface.
<P>
In this case, by adding <TT>target="#NSOwner"</TT>, we have specified
that the target of the button is the file owner object. We can then
implement the method <TT>printHello:</TT> of the file owner object to
do something, and then clicking on the button will cause that method
(and your specific code) to be executed.
<P>
To finish our tutorial example, we just need to add this method
<TT>printHello:</TT> to the file owner. Here is the code after this
final change -
<PRE>
#include <Foundation/Foundation.h>
#include <AppKit/AppKit.h>
#include <Renaissance/Renaissance.h>
@interface MyDelegate : NSObject
{}
- (void) printHello: (id)sender;
- (void) applicationDidFinishLaunching: (NSNotification *)not;
@end
@implementation MyDelegate : NSObject
- (void) printHello: (id)sender
{
printf ("Hello!\n");
}
- (void) applicationDidFinishLaunching: (NSNotification *)not;
{
[NSBundle loadGSMarkupNamed: @"Window" owner: self];
}
@end
int main (int argc, const char **argv)
{
CREATE_AUTORELEASE_POOL (pool);
MyDelegate *delegate;
[NSApplication sharedApplication];
delegate = [MyDelegate new];
[NSApp setDelegate: delegate];
#ifdef GNUSTEP
[NSBundle loadGSMarkupNamed: @"Menu-GNUstep" owner: delegate];
#else
[NSBundle loadGSMarkupNamed: @"Menu-OSX" owner: delegate];
#endif
RELEASE (pool);
return NSApplicationMain (argc, argv);
}
</PRE>
<P>
Finally, we want to underline that the most unpleasant part of the
work has been silently done by GNUstep Renaissance for us. If you
check the original code in the previous tutorial, you will see that we
have had to compute the button size, and to use the button size to
build up the window size. This has now all silently been done by
GNUstep Renaissance for us. GNUstep Renaissance has made the button
of the right size to display its title, then it has sized the window
to fit the only object it contains - the button. In more complex
windows, the help GNUstep Renaissance gives us by automatically sizing
and laying objects and windows can considerably reduce development
time.
<P>
<HR><B> Next: <A NAME="tex2html88"
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<ADDRESS>
Nicola
2003-01-31
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