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Club Amiga de Montreal - CAM
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CAM_CD_1.iso
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361b.lha
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CManual_v1.0_disk2
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Menus
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Example8.c.pp
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Example8.c
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C/C++ Source or Header
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1990-04-06
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17KB
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434 lines
/* Example8 */
/* Same as Example1 except that we this time will verify any menu */
/* operations. If the user tries to activate this program's menu we */
/* check if the position of the pointer, and if it is somewhere at the */
/* top of the window (less than 10 lines down) the menu operation will */
/* continue as normal, else we cancel the menu operation. */
#include <intuition/intuition.h>
struct IntuitionBase *IntuitionBase;
/*************************************************************************/
/* F O U R T H I T E M */
/*************************************************************************/
/* The text for the fourth item: */
struct IntuiText my_fourth_text=
{
2, /* FrontPen, black. */
0, /* BackPen, not used since JAM1. */
JAM1, /* DrawMode, do not change the background. */
CHECKWIDTH, /* LeftEdge, CHECKWIDTH amount of pixels out. */
/* This will leave enough space for the check mark. */
1, /* TopEdge, 1 line down. */
NULL, /* TextAttr, default font. */
"Italic", /* IText, the string. */
NULL /* NextItem, no link to other IntuiText structures. */
};
/* The MenuItem structure for the fourth item: */
struct MenuItem my_fourth_item=
{
NULL, /* NextItem, this is the last item in the list. */
0, /* LeftEdge, 0 pixels out. */
30, /* TopEdge, 30 lines down. */
150, /* Width, 150 pixels wide. */
10, /* Height, 10 lines high. */
ITEMTEXT| /* Flags, render this item with text. */
ITEMENABLED| /* this item will be enabled. */
CHECKIT| /* it is an attribute item. */
HIGHCOMP, /* complement the colours when highlihted. */
0x00000001, /* MutualExclude, mutualexclude the first item only. */
(APTR) &my_fourth_text, /* ItemFill, pointer to the text. */
NULL, /* SelectFill, nothing since we complement the col. */
0, /* Command, no command-key sequence. */
NULL, /* SubItem, no subitem list. */
MENUNULL, /* NextSelect, no items selected. */
};
/*************************************************************************/
/* T H I R D I T E M */
/*************************************************************************/
/* The text for the third item: */
struct IntuiText my_third_text=
{
2, /* FrontPen, black. */
0, /* BackPen, not used since JAM1. */
JAM1, /* DrawMode, do not change the background. */
CHECKWIDTH, /* LeftEdge, CHECKWIDTH amount of pixels out. */
/* This will leave enough space for the check mark. */
1, /* TopEdge, 1 line down. */
NULL, /* TextAttr, default font. */
"Underlined", /* IText, the string. */
NULL /* NextItem, no link to other IntuiText structures. */
};
/* The MenuItem structure for the third item: */
struct MenuItem my_third_item=
{
&my_fourth_item, /* NextItem, linked to the fourth item. */
0, /* LeftEdge, 0 pixels out. */
20, /* TopEdge, 20 lines down. */
150, /* Width, 150 pixels wide. */
10, /* Height, 10 lines high. */
ITEMTEXT| /* Flags, render this item with text. */
ITEMENABLED| /* this item will be enabled. */
CHECKIT| /* it is an attribute item. */
HIGHCOMP, /* complement the colours when highlihted. */
0x00000001, /* MutualExclude, mutualexclude the first item only. */
(APTR) &my_third_text, /* ItemFill, pointer to the text. */
NULL, /* SelectFill, nothing since we complement the col. */
0, /* Command, no command-key sequence. */
NULL, /* SubItem, no subitem list. */
MENUNULL, /* NextSelect, no items selected. */
};
/*************************************************************************/
/* S E C O N D I T E M */
/*************************************************************************/
/* The text for the second item: */
struct IntuiText my_second_text=
{
2, /* FrontPen, black. */
0, /* BackPen, not used since JAM1. */
JAM1, /* DrawMode, do not change the background. */
CHECKWIDTH, /* LeftEdge, CHECKWIDTH amount of pixels out. */
/* This will leave enough space for the check mark. */
1, /* TopEdge, 1 line down. */
NULL, /* TextAttr, default font. */
"Bold", /* IText, the string. */
NULL /* NextItem, no link to other IntuiText structures. */
};
/* The MenuItem structure for the second item: */
struct MenuItem my_second_item=
{
&my_third_item, /* NextItem, linked to the third item. */
0, /* LeftEdge, 0 pixels out. */
10, /* TopEdge, 10 lines down. */
150, /* Width, 150 pixels wide. */
10, /* Height, 10 lines high. */
ITEMTEXT| /* Flags, render this item with text. */
ITEMENABLED| /* this item will be enabled. */
CHECKIT| /* it is an attribute item. */
HIGHCOMP, /* complement the colours when highlihted. */
0x00000001, /* MutualExclude, mutualexclude the first item only. */
(APTR) &my_second_text, /* ItemFill, pointer to the text. */
NULL, /* SelectFill, nothing since we complement the col. */
0, /* Command, no command-key sequence. */
NULL, /* SubItem, no subitem list. */
MENUNULL, /* NextSelect, no items selected. */
};
/*************************************************************************/
/* F I R S T I T E M */
/*************************************************************************/
/* The text for the first item: */
struct IntuiText my_first_text=
{
2, /* FrontPen, black. */
0, /* BackPen, not used since JAM1. */
JAM1, /* DrawMode, do not change the background. */
CHECKWIDTH, /* LeftEdge, CHECKWIDTH amount of pixels out. */
/* This will leave enough space for the check mark. */
1, /* TopEdge, 1 line down. */
NULL, /* TextAttr, default font. */
"Plain", /* IText, the string. */
NULL /* NextItem, no link to other IntuiText structures. */
};
/* The MenuItem structure for the first item: */
struct MenuItem my_first_item=
{
&my_second_item, /* NextItem, linked to the second item. */
0, /* LeftEdge, 0 pixels out. */
0, /* TopEdge, 0 lines down. */
150, /* Width, 150 pixels wide. */
10, /* Height, 10 lines high. */
ITEMTEXT| /* Flags, render this item with text. */
ITEMENABLED| /* this item will be enabled. */
CHECKIT| /* it is an attribute item. */
CHECKED| /* this item is initially selected. */
HIGHCOMP, /* complement the colours when highlihted. */
0xFFFFFFFE, /* MutualExclude, mutualexclude all items except the */
/* first one. */
(APTR) &my_first_text, /* ItemFill, pointer to the text. */
NULL, /* SelectFill, nothing since we complement the col. */
0, /* Command, no command-key sequence. */
NULL, /* SubItem, no subitem list. */
MENUNULL, /* NextSelect, no items selected. */
};
/*************************************************************************/
/* M E N U */
/*************************************************************************/
/* The Menu structure for the first (and only) menu: */
struct Menu my_menu=
{
NULL, /* NextMenu, no more menu structures. */
0, /* LeftEdge, left corner. */
0, /* TopEdge, for the moment ignored by Intuition. */
50, /* Width, 50 pixels wide. */
0, /* Height, for the moment ignored by Intuition. */
MENUENABLED, /* Flags, this menu will be enabled. */
"Mode", /* MenuName, the string. */
&my_first_item /* FirstItem, pointer to the first item in the list. */
};
/* Declare a pointer to a Window structure: */
struct Window *my_window;
/* Declare and initialize your NewWindow structure: */
struct NewWindow my_new_window=
{
0, /* LeftEdge x position of the window. */
0, /* TopEdge y positio of the window. */
320, /* Width 320 pixels wide. */
100, /* Height 100 lines high. */
0, /* DetailPen Text should be drawn with colour reg. 0 */
1, /* BlockPen Blocks should be drawn with colour reg. 1 */
CLOSEWINDOW| /* IDCMPFlags The window will give us a message if the */
/* user has selected the Close window gad. */
MENUPICK| /* Or if the user has done a menu operation, */
MENUVERIFY, /* or if the user tries to activate a menu. */
SMART_REFRESH| /* Flags Intuition should refresh the window. */
WINDOWCLOSE| /* Close Gadget. */
WINDOWDRAG| /* Drag gadget. */
WINDOWDEPTH| /* Depth arrange Gadgets. */
WINDOWSIZING| /* Sizing Gadget. */
ACTIVATE, /* The window should be Active when opened. */
NULL, /* FirstGadget No Custom gadgets. */
NULL, /* CheckMark Use Intuition's default CheckMark. */
"Style Editor",/* Title Title of the window. */
NULL, /* Screen Connected to the Workbench Screen. */
NULL, /* BitMap No Custom BitMap. */
80, /* MinWidth We will not allow the window to become */
30, /* MinHeight smaller than 80 x 30, and not bigger */
300, /* MaxWidth than 300 x 200. */
200, /* MaxHeight */
WBENCHSCREEN /* Type Connected to the Workbench Screen. */
};
main()
{
/* Boolean variable used for the while loop: */
BOOL close_me;
/* Declare a variable in which we will store the IDCMP flag: */
ULONG class;
/* If we recieve a MENUPICK event, the Code field of the message */
/* structure will contain the menu number of the first selected item. */
/* Declare a variable to store the Code value in, and an extra menu */
/* number variable: */
USHORT code, menu_number;
/* Declare a MenuItem pointer: */
struct MenuItem *item;
/* Declare a pointer to an IntuiMessage structure: */
struct IntuiMessage *my_message;
/* Before we can use Intuition we need to open the Intuition Library: */
IntuitionBase = (struct IntuitionBase *)
OpenLibrary( "intuition.library", 0 );
if( IntuitionBase == NULL )
exit(); /* Could NOT open the Intuition Library! */
/* We will now try to open the window: */
my_window = (struct Window *) OpenWindow( &my_new_window );
/* Have we opened the window succesfully? */
if(my_window == NULL)
{
/* Could NOT open the Window! */
/* Close the Intuition Library since we have opened it: */
CloseLibrary( IntuitionBase );
exit();
}
/* We have opened the window, and everything seems to be OK. */
SetMenuStrip( my_window, &my_menu );
printf("Menustrip connected to window!\n");
close_me = FALSE;
/* Stay in the while loop until the user has selected the Close window */
/* gadget: */
while( close_me == FALSE )
{
/* Wait until we have recieved a message: */
Wait( 1 << my_window->UserPort->mp_SigBit );
/* As long as we collect messages sucessfully we stay in the loop: */
while(my_message=(struct IntuiMessage *) GetMsg( my_window->UserPort ))
{
/* After we have collected the message we can read it, and save any */
/* important values which we maybe want to check later: */
class = my_message->Class;
code = my_message->Code;
/* Before we reply we need to see if we have recieved a MENUVERIFY */
/* message: */
if( class == MENUVERIFY )
{
/* Yes, we have recieved a MENUVERIFY message! */
/* The user wants to activate a menu, but the problem is that we */
/* do not know if it is our window's menu that will be activated, */
/* or some other window's menu. We can however check it by */
/* examining the Code field of the message. If it is equal to */
/* MENUWAITING, it means that it is not your window's menu that */
/* will be activated, but if Code is equal to MENUHOT it means it */
/* is is your window's menu that will be activated! */
if( code == MENUWAITING )
{
/* It is not your window's menu that will be activated! */
/* Your program can take a pause if necessary. You maybe want */
/* to finish of with some drawings, so your program does not */
/* trash any menus. This is especially important if you are */
/* using the low-level graphics rutines since they do not */
/* bother about, windows etc, and will draw over and destroy */
/* anything in their way. */
/* Once the program is ready it should reply the message, and */
/* the menu will be activated. */
printf("Another program's menu will be displayed!\n");
}
else
if( code == MENUHOT )
{
/* It is your window's menu that will be activated! */
/* You can now take a pause and finish of with something */
/* before you let Intuition activate the menu, or you can */
/* even stop the whole menu operation if necessary. If you */
/* are writing a paint program you maybe only want the user */
/* to be able to activate the menu if the pointer is at the */
/* top of the display. That would mean that the user can */
/* draw with the right mouse button, and when the user wants */
/* to make a menu choice, he/she simply moves the pointer to */
/* the top of the display, and then presses the right mouse */
/* button. */
/* We will now check if the pointer is somewhere at the top */
/* of the display: */
if( my_window->MouseY < 10)
{
/* The Y coordinate of the pointer is at least less than */
/* 10 lines below the TopEdge of the window. */
/* The menu operation should continue as soon as possible! */
printf("OK!\n");
}
else
{
/* The pointer is below the Title bar of the window! */
/* Cancel the whole menu operation! */
/* To cancel a menu operation you need to change the Code */
/* field to MENUCANCEL. IMPORTANT! Do not change the code */
/* variable since it is just a copy of the real Code value. */
/* What we need to do is to change the real value, and that */
/* is still OK since we have not replied yet. */
my_message->Code=MENUCANCEL;
printf("Menu operation canceled!\n");
}
}
}
/* After we have read it we reply as fast as possible: */
/* REMEMBER! Do never try to read a message after you have replied! */
/* Some other process has maybe changed it. */
ReplyMsg( my_message );
/* Check which IDCMP flag was sent: */
if( class == CLOSEWINDOW )
close_me=TRUE; /* The user selected the Close window gadget! */
if(class == MENUPICK)
{
printf("\nMenu pick!\n");
menu_number = code;
while( menu_number != MENUNULL )
{
/* Get the address of the item: */
item = (struct MenuItem *) ItemAddress( &my_menu, menu_number );
/* Print out the menu number plus etc: */
printf("menu_number= %d\n", menu_number );
printf("MENUNUM = %d\n", MENUNUM(menu_number) );
printf("ITEMNUM = %d\n", ITEMNUM(menu_number) );
printf("SUBNUM = %d\n", SUBNUM(menu_number) );
/* Get the following item's menu number: */
menu_number = item->NextSelect;
}
}
}
}
printf("Menustrip removed from window!\n");
ClearMenuStrip( my_window );
/* Close the window: */
CloseWindow( my_window );
/* Close the Intuition Library since we have opened it: */
CloseLibrary( IntuitionBase );
/* THE END */
}