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Tricks of the Mac Game Programming Gurus
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dialogs.c
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C/C++ Source or Header
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1994-10-18
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6KB
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191 lines
#include "dialogs.h"
#include "main.h"
void PositionDialog(ResType theType, short theID)
/* call this function BEFORE loading an alert or dialog box; this function will
load the alert/dialog into memory and position it centered horizontally and
positioned 1:3 vertically. Then, load the alert/dialog right after the call
to PositionDialog, and the alert/dialog will be loaded from the copy in
memory, which has already been positioned correctly. Cute, eh? See error.c
for an example. */
{
Handle theTemplate; /* Handle to resource template */
register Rect *theRect; /* Bounding box of dialog */
register short left; /* Left side of centered rect */
register short top; /* Top side of centered rect */
/* The first field of the resource template for DLOG's and ALRT's */
/* is its bounding box. Get a pointer to this rectangle. This */
/* handle dereferencing is safe since the remaining statements in */
/* this function do not move memory (assignment and simple math). */
theTemplate = GetResource(theType, theID);
if (theTemplate == 0)
return;
theRect=(Rect*)*theTemplate; /* bounding rectangle */
left = (qd.screenBits.bounds.right - (theRect->right - theRect->left)) / 2;
top = (qd.screenBits.bounds.bottom - (theRect->bottom - theRect->top)) / 3;
if (top < (GetMBarHeight() + 1)) /* don't put it over menu bar */
top = GetMBarHeight() + 1;
theRect->right += left - theRect->left;
theRect->left = left;
theRect->bottom += top - theRect->top;
theRect->top = top;
}
pascal void OutlineDefaultButton(DialogPtr myDlog, short itemNum)
/* Use this as the useritem for a dialog which needs an outlined default button. */
/* Make sure the default button is item 1 in the DITL. */
{
short itemType;
Handle itemH;
Rect box;
GetDItem(myDlog, 1, &itemType, &itemH, &box);
PenSize(3, 3);
InsetRect(&box, -4, -4);
FrameRoundRect(&box, 16, 16);
PenNormal();
}
pascal Boolean OneButtonFilter(DialogPtr theDialog, EventRecord *theEvent, short *theItem)
/* use this as the proc filter when calling ModalDialog -- it maps RETURN and
ENTER to button 1. Of course, button 1 should be the OK button. */
{
unsigned char theChar;
switch (theEvent->what) /* examine event record */
{
case keyDown: /* keypress */
case autoKey:
theChar=theEvent->message & charCodeMask; /* get ascii char value */
if ((theChar==0x0d) || (theChar==0x03)) /* RETURN or ENTER */
{
*theItem=FakeSelect(theDialog, 1);
return TRUE;
}
break;
case updateEvt:
if ((theEvent->message)!=(unsigned long)theDialog)
DispatchEvents(*theEvent, FALSE);
else
OutlineDefaultButton(theDialog, 1);
break;
}
return FALSE; /* no faking, proceed as planned */
}
pascal Boolean TwoButtonFilter(DialogPtr theDialog, EventRecord *theEvent, short *theItem)
/* use this as the proc filter when calling ModalDialog -- it maps RETURN and
ENTER to button 1, and ESCAPE and COMMAND-PERIOD to button 2. Of course,
button 1 should be the OK button and button 2 should be the cancel button. */
{
unsigned char theChar;
switch (theEvent->what) /* examine event record */
{
case keyDown: /* keypress */
case autoKey:
theChar=theEvent->message & charCodeMask; /* get ascii char value */
if ((theChar==0x0d) || (theChar==0x03)) /* RETURN or ENTER */
{
*theItem=FakeSelect(theDialog, 1);
return TRUE;
}
if ((theChar==0x1b) || (theChar=='`') || /* ESCAPE */
((theEvent->modifiers & cmdKey) && (theChar=='.'))) /* COMMAND-PERIOD */
{
*theItem=FakeSelect(theDialog, 2);
return TRUE;
}
break;
case updateEvt:
if ((theEvent->message)!=(unsigned long)theDialog)
DispatchEvents(*theEvent, FALSE);
else
OutlineDefaultButton(theDialog, 1);
break;
}
return FALSE; /* no faking, proceed as planned */
}
pascal Boolean ThreeButtonFilter(DialogPtr theDialog, EventRecord *theEvent, short *theItem)
/* use this as the proc filter when calling ModalDialog -- it maps RETURN and
ENTER to button 1, and ESCAPE and COMMAND-PERIOD to button 2, and command-D to
button 3. (This is good for the "save document?" alert. Of course,
button 1 should be the OK button and button 2 should be the cancel button. */
{
unsigned char theChar;
switch (theEvent->what) /* examine event record */
{
case keyDown: /* keypress */
case autoKey:
theChar=theEvent->message & charCodeMask; /* get ascii char value */
if ((theChar==0x0d) || (theChar==0x03)) /* RETURN or ENTER */
{
*theItem=FakeSelect(theDialog, 1);
return TRUE;
}
if ((theChar==0x1b) || (theChar=='`') || /* ESCAPE */
((theEvent->modifiers & cmdKey) && (theChar=='.'))) /* COMMAND-PERIOD */
{
*theItem=FakeSelect(theDialog, 2);
return TRUE;
}
if ((theEvent->modifiers & cmdKey) && ((theChar|0x20)=='d'))
{
*theItem=FakeSelect(theDialog, 3);
return TRUE;
}
break;
case updateEvt:
if ((theEvent->message)!=(unsigned long)theDialog)
DispatchEvents(*theEvent, FALSE);
else
OutlineDefaultButton(theDialog, 1);
break;
}
return FALSE; /* no faking, proceed as planned */
}
short FakeSelect(DialogPtr theDialog, short itemNum)
{
short itemType;
Handle itemH;
Rect box;
long dummy;
GetDItem(theDialog, itemNum, &itemType, &itemH, &box);
HiliteControl((ControlHandle)itemH, 1);
Delay(8, &dummy);
HiliteControl((ControlHandle)itemH, 0);
return itemNum;
}
void SetButtonHighlight(DialogPtr theDialog, short itemNum, Boolean isOn)
{
Rect box;
short itemType;
Handle itemH;
GetDItem(theDialog, itemNum, &itemType, &itemH, &box);
HiliteControl((ControlHandle)itemH, isOn ? 0 : 255);
}
void SetButtonTitle(DialogPtr theDialog, short itemNum, Str255 theStr)
{
Rect box;
short itemType;
Handle itemH;
GetDItem(theDialog, itemNum, &itemType, &itemH, &box);
SetCTitle((ControlHandle)itemH, theStr);
}