// button2-
//
//	This program demonstrates changing a button's caption and other attributes
// under program control,

program button2;
#linker( "comdlg32.lib" ) 
#linker( "comctl32.lib" )

?compileAll		:= true;

?@NoDisplay 	:= true;
?@NoStackAlign	:= true;

#includeOnce( "stdlib.hhf" )

#includeOnce( "howl.hhf" )


const
	applicationName := "Button #2";
	formX			:= w.CW_USEDEFAULT;	// Let Windows position this guy
	formY			:= w.CW_USEDEFAULT;
	formW			:= 600;
	formH			:= 600;



static
	align( 4 );
	bkgBrush_g	:dword;
	bkgColor_g	:dword;
	
	
// Forward declarations for the onClick widgetProcs that we're going to
// call when a button is pressed.

proc onSetFocus1:widgetProc; @forward;
proc onKillFocus1:widgetProc; @forward;
proc onClickChange1:widgetProc; @forward;
proc onClickChange2:widgetProc; @forward;
proc onQuit:widgetProc; @forward;



// Here's the main form definition for the app:

wForm( mainAppWindow );

	
	wPushButton
	(
		button1,				// Field name in mainWindow object
		"Press to change",	// Caption for push button
		10,					// x position 
		10,					// y position 
		125,				// width 
		25,					// height 
		onClickChange1		// initial "on click" event handler 
	)
	// Place a quit button in the lower-right-hand corner of the form:
	
	wPushButton
	(
		quitButton,			// Field name in mainWindow object
		"Quit",				// Caption for push button
		450,				// x position 
		525,				// y position 
		125,				// width 
		25,					// height 
		onQuit				// "on click" event handler 
	)
	
endwForm


// Must invoke the following macro to emit the code generated by
// the wForm macro:

mainAppWindow_implementation();
	


// The onSetFocus and onKillFocus widgetProcs simply print to the console
// what has happened.

proc onSetFocus1:widgetProc;
begin onSetFocus1;

	stdout.put( "Set focus to button 1" nl );
	
end onSetFocus1;


proc onKillFocus1:widgetProc;
begin onKillFocus1;

	stdout.put( "Shifted focus from button 1" nl );
	
end onKillFocus1;


// Here's 1 of 2 onClick handlers for button1. This widgetProc
// changes the caption to "Restore caption" and sets the 
// onClick pointer to point at the second onClick handler.


proc onClickChange1:widgetProc;
var
	curCaption	:string;
	curCapBuf	:char[256];
	
begin onClickChange1;

	str.init( curCapBuf, @size( curCapBuf ));
	mov( eax, curCaption );
	
	mov( thisPtr, esi );		// ESI already contains this, but just in case...
	
	// Print the current caption to the console window:
	
	(type wPushButton_t [esi]).get_text( curCaption );
	stdout.put( "Current caption1: ", curCaption, nl );
	

	// Change the caption:
	
	(type wPushButton_t [esi]).set_text( "Restore original" );
	
	// Point the onClick handler at onClickChange2:
	
	(type wPushButton_t [esi]).set_onClick( &onClickChange2 );

	
	// Print the new caption to the console window:
	
	(type wPushButton_t [esi]).a_get_text();
	stdout.put( "New caption1: ", (type string eax), nl nl );
	str.free( eax );

end onClickChange1;
	
	

// Here's 2 of 2 onClick handlers for button1. This widgetProc
// changes the caption back to "Restore caption" and sets the 
// onClick pointer to point at the first onClick handler.

																	
proc onClickChange2:widgetProc;
var
	curCaption	:string;
	curCapBuf	:char[256];
	
begin onClickChange2;

	str.init( curCapBuf, @size( curCapBuf ));
	mov( eax, curCaption );
	
	mov( thisPtr, esi );		// ESI already contains this, but just in case...
	
	// Print the current caption to the console window:
	
	(type wPushButton_t [esi]).get_text( curCaption );
	stdout.put( "Current caption2: ", curCaption, nl );
	

	// Change the caption:
	
	(type wPushButton_t [esi]).set_text( "Press to change" );
	
	// Point the onClick handler at onClickChange1:
	
	(type wPushButton_t [esi]).set_onClick( &onClickChange1 );

	
	// Print the new caption to the console window:
	
	(type wPushButton_t [esi]).a_get_text();
	stdout.put( "New caption2: ", (type string eax), nl nl );
	str.free( eax );

end onClickChange2;
	
	

// Here's the onClick event handler for our quit button on the form.
// This handler will simply quit the application:

proc onQuit:widgetProc;
begin onQuit;

	// Quit the app:
	
	w.PostQuitMessage( 0 );

end onQuit;
	
	
	
// The following gets called immediately after the main application
// window is created. It must be provided, even if it does nothing.
		
method mainAppWindow_t.onCreate;
begin onCreate;

	// Lets set up the button1's onSetFocus and onKillFocus event handlers:
	
	mov( this.button1, esi );
	(type wPushButton_t [esi]).set_onSetFocus( &onSetFocus1 );
	(type wPushButton_t [esi]).set_onKillFocus( &onKillFocus1 );

end onCreate;
	
	
///////////////////////////////////////////////////////////////////////////////
//
//
// The following is mostly boilerplate code for all apps (about the only thing
// you would change is the size of the main app's form)
//
//
///////////////////////////////////////////////////////////////////////////////
//	
// When the main application window closes, we need to terminate the 
// application. This overridden method handles that situation.  Notice the
// override declaration for onClose in the wForm declaration given earlier.
// Without that, mainAppWindow_t would default to using the wVisual_t.onClose
// method (which does nothing). 
		
method mainAppWindow_t.onClose;
begin onClose;
	
	// Tell the winmain main program that it's time to terminate.
	// Note that this message will (ultimately) cause the appTerminate
	// procedure to be called.
	
	w.PostQuitMessage( 0 );
	
	
end onClose;

			   
   

			   
   
// When the application begins execution, the following procedure
// is called.  This procedure must create the main
// application window in order to kick off the execution of the
// GUI application:
  
procedure appStart;
begin appStart;

	push( esi );
	
	// Create the main application window:
	
	w.GetSysColor( w.COLOR_MENU );
	mov( eax, bkgColor_g );
	w.CreateSolidBrush( eax );
	mov( eax, bkgBrush_g );
	mainAppWindow.create_mainAppWindow
	(
		applicationName,		// Window title
		w.WS_EX_CONTROLPARENT,	// Need this to support TAB control selection
		w.WS_OVERLAPPEDWINDOW,	// Style 
		NULL,					// No parent window 									
		formX,					// Form x-coordinate 
		formY,					// Form y-coordinate
		formW,					// Width
		formH,					// Height
		bkgColor_g,				// Background color
		true					// Make visible on creation 
	);
	mov( esi, pmainAppWindow );	// Save pointer to main window object.
		
	pop( esi );

end appStart;



// appTerminate-
//
//	Called when the application is quitting, giving the app a chance
// to clean up after itself.
//
// Note that this is called *after* the mainAppWindow_t.onClose method
// executes (indeed, mainAppWindow_t.onClose, by posting the quit message,
// is what actually causes the program to begin terminating, which leads
// to the execution of this procedure).

procedure appTerminate;
begin appTerminate;
	
	// Clean up the main application's form.
	// Note that this will recursively clean up all the widgets on the form.
	
	mainAppWindow.destroy();
	w.DeleteObject( bkgBrush_g );	
	
end appTerminate;


// appException-
//
// Gives the application the opportunity to clean up before
// aborting when an unhandled exception comes along:

procedure appException( theException:dword in eax );
begin appException;

	raise( eax );

end appException;



// The main program for a HOWL application must simply
// call the HowlMainApp procedure.

begin button2;

	HowlMainApp();			
				
end button2;