Initial revision

1 files changed, 1057 insertions, 0 deletions

diff --git a/mac/tkMacScrlbr.c b/mac/tkMacScrlbr.c
new file mode 100644
index 0000000..c76daec
--- /dev/null
+++ b/mac/tkMacScrlbr.c
@@ -0,0 +1,1057 @@
+/* 
+ * tkMacScrollbar.c --
+ *
+ *	This file implements the Macintosh specific portion of the scrollbar
+ *	widget.  The Macintosh scrollbar may also draw a windows grow
+ *	region under certain cases.
+ *
+ * Copyright (c) 1996 by Sun Microsystems, Inc.
+ *
+ * See the file "license.terms" for information on usage and redistribution
+ * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ *
+ * SCCS: @(#) tkMacScrlbr.c 1.9 96/12/10 20:04:39
+ */
+
+#include "tkScrollbar.h"
+#include "tkMacInt.h"
+#include <Controls.h>
+
+/*
+ * The following definitions should really be in MacOS
+ * header files.  They are included here as this is the only
+ * file that needs the declarations.
+ */
+typedef	pascal void (*ThumbActionFunc)(void);
+
+#if GENERATINGCFM
+typedef UniversalProcPtr ThumbActionUPP;
+#else
+typedef ThumbActionFunc ThumbActionUPP;
+#endif
+
+enum {
+	uppThumbActionProcInfo = kPascalStackBased
+};
+
+#if GENERATINGCFM
+#define NewThumbActionProc(userRoutine)		\
+		(ThumbActionUPP) NewRoutineDescriptor((ProcPtr)(userRoutine), uppThumbActionProcInfo, GetCurrentArchitecture())
+#else
+#define NewThumbActionProc(userRoutine)		\
+		((ThumbActionUPP) (userRoutine))
+#endif
+
+/*
+ * Minimum slider length, in pixels (designed to make sure that the slider
+ * is always easy to grab with the mouse).
+ */
+
+#define MIN_SLIDER_LENGTH	5
+
+/*
+ * Declaration of Windows specific scrollbar structure.
+ */
+
+typedef struct MacScrollbar {
+    TkScrollbar info;		/* Generic scrollbar info. */
+    ControlRef sbHandle;	/* Handle to the Scrollbar control struct. */
+    int macFlags;		/* Various flags; see below. */
+} MacScrollbar;
+
+/*
+ * Flag bits for scrollbars on the Mac:
+ * 
+ * ALREADY_DEAD:		Non-zero means this scrollbar has been
+ *				destroyed, but has not been cleaned up.
+ * IN_MODAL_LOOP:		Non-zero means this scrollbar is in the middle
+ *				of a modal loop.
+ * ACTIVE:			Non-zero means this window is currently
+ *				active (in the foreground).
+ * FLUSH_TOP:			Flush with top of Mac window.
+ * FLUSH_BOTTOM:		Flush with bottom of Mac window.
+ * FLUSH_RIGHT:			Flush with right of Mac window.
+ * FLUSH_LEFT:			Flush with left of Mac window.
+ * SCROLLBAR_GROW:		Non-zero means this window draws the grow
+ *				region for the toplevel window.
+ * AUTO_ADJUST:			Non-zero means we automatically adjust
+ *				the size of the widget to align correctly
+ *				along a Mac window.
+ * DRAW_GROW:			Non-zero means we draw the grow region.
+ */
+
+#define ALREADY_DEAD		1
+#define IN_MODAL_LOOP		2
+#define ACTIVE			4
+#define FLUSH_TOP		8
+#define FLUSH_BOTTOM		16
+#define FLUSH_RIGHT		32
+#define FLUSH_LEFT		64
+#define SCROLLBAR_GROW		128
+#define AUTO_ADJUST		256
+#define DRAW_GROW		512
+
+/*
+ * Globals uses locally in this file.
+ */
+static ControlActionUPP scrollActionProc = NULL; /* Pointer to func. */
+static ThumbActionUPP thumbActionProc = NULL;    /* Pointer to func. */
+static TkScrollbar *activeScrollPtr = NULL;        /* Non-null when in thumb */
+						 /* proc. */
+/*
+ * Forward declarations for procedures defined later in this file:
+ */
+
+static pascal void	ScrollbarActionProc _ANSI_ARGS_((ControlRef theControl,
+			    ControlPartCode partCode));
+static int		ScrollbarBindProc _ANSI_ARGS_((ClientData clientData,
+			    Tcl_Interp *interp, XEvent *eventPtr,
+			    Tk_Window tkwin, KeySym keySym));
+static void		ScrollbarEventProc _ANSI_ARGS_((
+			    ClientData clientData, XEvent *eventPtr));
+static pascal void	ThumbActionProc _ANSI_ARGS_((void));
+static void		UpdateControlValues _ANSI_ARGS_((MacScrollbar *macScrollPtr));
+		    
+/*
+ * The class procedure table for the scrollbar widget.
+ */
+
+TkClassProcs tkpScrollbarProcs = { 
+    NULL,			/* createProc. */
+    NULL,			/* geometryProc. */
+    NULL			/* modalProc */
+};
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TkpCreateScrollbar --
+ *
+ *	Allocate a new TkScrollbar structure.
+ *
+ * Results:
+ *	Returns a newly allocated TkScrollbar structure.
+ *
+ * Side effects:
+ *	None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+TkScrollbar *
+TkpCreateScrollbar(
+    Tk_Window tkwin)	/* New Tk Window. */
+{
+    MacScrollbar * macScrollPtr;
+    TkWindow *winPtr = (TkWindow *)tkwin;
+    
+    if (scrollActionProc == NULL) {
+	scrollActionProc = NewControlActionProc(ScrollbarActionProc);
+	thumbActionProc = NewThumbActionProc(ThumbActionProc);
+    }
+
+    macScrollPtr = (MacScrollbar *) ckalloc(sizeof(MacScrollbar));
+    macScrollPtr->sbHandle = NULL;
+    macScrollPtr->macFlags = 0;
+
+    Tk_CreateEventHandler(tkwin, ActivateMask|ExposureMask|
+	    StructureNotifyMask|FocusChangeMask,
+	    ScrollbarEventProc, (ClientData) macScrollPtr);
+
+    if (!Tcl_GetAssocData(winPtr->mainPtr->interp, "TkScrollbar", NULL)) {
+	Tcl_SetAssocData(winPtr->mainPtr->interp, "TkScrollbar", NULL,
+		(ClientData)1);
+	TkCreateBindingProcedure(winPtr->mainPtr->interp,
+		winPtr->mainPtr->bindingTable,
+		(ClientData)Tk_GetUid("Scrollbar"), "<ButtonPress>",
+		ScrollbarBindProc, NULL, NULL);
+    }
+
+    return (TkScrollbar *) macScrollPtr;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * TkpDisplayScrollbar --
+ *
+ *	This procedure redraws the contents of a scrollbar window.
+ *	It is invoked as a do-when-idle handler, so it only runs
+ *	when there's nothing else for the application to do.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	Information appears on the screen.
+ *
+ *--------------------------------------------------------------
+ */
+
+void
+TkpDisplayScrollbar(
+    ClientData clientData)	/* Information about window. */
+{
+    register TkScrollbar *scrollPtr = (TkScrollbar *) clientData;
+    register MacScrollbar *macScrollPtr = (MacScrollbar *) clientData;
+    register Tk_Window tkwin = scrollPtr->tkwin;
+    
+    MacDrawable *macDraw;
+    CGrafPtr saveWorld;
+    GDHandle saveDevice;
+    GWorldPtr destPort;
+    WindowRef windowRef;
+    
+    if ((scrollPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
+	goto done;
+    }
+
+    /*
+     * Draw the focus or any 3D relief we may have.
+     */
+    if (scrollPtr->highlightWidth != 0) {
+	GC gc;
+
+	if (scrollPtr->flags & GOT_FOCUS) {
+	    gc = Tk_GCForColor(scrollPtr->highlightColorPtr,
+		    Tk_WindowId(tkwin));
+	} else {
+	    gc = Tk_GCForColor(scrollPtr->highlightBgColorPtr,
+		    Tk_WindowId(tkwin));
+	}
+	Tk_DrawFocusHighlight(tkwin, gc, scrollPtr->highlightWidth,
+		Tk_WindowId(tkwin));
+    }
+    Tk_Draw3DRectangle(tkwin, Tk_WindowId(tkwin), scrollPtr->bgBorder,
+	    scrollPtr->highlightWidth, scrollPtr->highlightWidth,
+	    Tk_Width(tkwin) - 2*scrollPtr->highlightWidth,
+	    Tk_Height(tkwin) - 2*scrollPtr->highlightWidth,
+	    scrollPtr->borderWidth, scrollPtr->relief);
+
+    /*
+     * Set up port for drawing Macintosh control.
+     */
+    macDraw = (MacDrawable *) Tk_WindowId(tkwin);
+    destPort = TkMacGetDrawablePort(Tk_WindowId(tkwin));
+    GetGWorld(&saveWorld, &saveDevice);
+    SetGWorld(destPort, NULL);
+    TkMacSetUpClippingRgn(Tk_WindowId(tkwin));
+
+    if (macScrollPtr->sbHandle == NULL) {
+        Rect r;
+        
+        r.left = r.top = 0;
+        r.right = r.bottom = 1;
+	macScrollPtr->sbHandle = NewControl((WindowRef) destPort, &r, "\p",
+		false, (short) 500, 0, 1000,
+		scrollBarProc, (SInt32) scrollPtr);
+
+	/*
+	 * If we are foremost than make us active.
+	 */
+	if ((WindowPtr) destPort == FrontWindow()) {
+	    macScrollPtr->macFlags |= ACTIVE;
+	}
+    }
+
+    /*
+     * Update the control values before we draw.
+     */
+    windowRef  = (**macScrollPtr->sbHandle).contrlOwner;    
+    UpdateControlValues(macScrollPtr);
+    
+    if (macScrollPtr->macFlags & ACTIVE) {
+	Draw1Control(macScrollPtr->sbHandle);
+	if (macScrollPtr->macFlags & DRAW_GROW) {
+	    DrawGrowIcon(windowRef);
+	}
+    } else {
+	(**macScrollPtr->sbHandle).contrlHilite = 255;
+	Draw1Control(macScrollPtr->sbHandle);
+	if (macScrollPtr->macFlags & DRAW_GROW) {
+	    DrawGrowIcon(windowRef);
+	    Tk_Fill3DRectangle(tkwin, Tk_WindowId(tkwin), scrollPtr->bgBorder,
+		Tk_Width(tkwin) - 13, Tk_Height(tkwin) - 13,
+		Tk_Width(tkwin), Tk_Height(tkwin),
+		0, TK_RELIEF_FLAT);
+	}
+    }
+    
+    SetGWorld(saveWorld, saveDevice);
+     
+    done:
+    scrollPtr->flags &= ~REDRAW_PENDING;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TkpConfigureScrollbar --
+ *
+ *	This procedure is called after the generic code has finished
+ *	processing configuration options, in order to configure
+ *	platform specific options.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+TkpConfigureScrollbar(scrollPtr)
+    register TkScrollbar *scrollPtr;	/* Information about widget;  may or
+					 * may not already have values for
+					 * some fields. */
+{
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TkpComputeScrollbarGeometry --
+ *
+ *	After changes in a scrollbar's size or configuration, this
+ *	procedure recomputes various geometry information used in
+ *	displaying the scrollbar.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	The scrollbar will be displayed differently.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+TkpComputeScrollbarGeometry(
+    register TkScrollbar *scrollPtr)	/* Scrollbar whose geometry may
+					 * have changed. */
+{
+    MacScrollbar *macScrollPtr = (MacScrollbar *) scrollPtr;
+    int width, fieldLength, adjust = 0;
+
+    if (scrollPtr->highlightWidth < 0) {
+	scrollPtr->highlightWidth = 0;
+    }
+    scrollPtr->inset = scrollPtr->highlightWidth + scrollPtr->borderWidth;
+    width = (scrollPtr->vertical) ? Tk_Width(scrollPtr->tkwin)
+	    : Tk_Height(scrollPtr->tkwin);
+    scrollPtr->arrowLength = width - 2*scrollPtr->inset + 1;
+    fieldLength = (scrollPtr->vertical ? Tk_Height(scrollPtr->tkwin)
+	    : Tk_Width(scrollPtr->tkwin))
+	    - 2*(scrollPtr->arrowLength + scrollPtr->inset);
+    if (fieldLength < 0) {
+	fieldLength = 0;
+    }
+    scrollPtr->sliderFirst = fieldLength*scrollPtr->firstFraction;
+    scrollPtr->sliderLast = fieldLength*scrollPtr->lastFraction;
+
+    /*
+     * Adjust the slider so that some piece of it is always
+     * displayed in the scrollbar and so that it has at least
+     * a minimal width (so it can be grabbed with the mouse).
+     */
+
+    if (scrollPtr->sliderFirst > (fieldLength - 2*scrollPtr->borderWidth)) {
+	scrollPtr->sliderFirst = fieldLength - 2*scrollPtr->borderWidth;
+    }
+    if (scrollPtr->sliderFirst < 0) {
+	scrollPtr->sliderFirst = 0;
+    }
+    if (scrollPtr->sliderLast < (scrollPtr->sliderFirst
+	    + MIN_SLIDER_LENGTH)) {
+	scrollPtr->sliderLast = scrollPtr->sliderFirst + MIN_SLIDER_LENGTH;
+    }
+    if (scrollPtr->sliderLast > fieldLength) {
+	scrollPtr->sliderLast = fieldLength;
+    }
+    scrollPtr->sliderFirst += scrollPtr->arrowLength + scrollPtr->inset;
+    scrollPtr->sliderLast += scrollPtr->arrowLength + scrollPtr->inset;
+
+    /*
+     * Register the desired geometry for the window (leave enough space
+     * for the two arrows plus a minimum-size slider, plus border around
+     * the whole window, if any).  Then arrange for the window to be
+     * redisplayed.
+     */
+
+    if (scrollPtr->vertical) {
+	if ((macScrollPtr->macFlags & AUTO_ADJUST) &&
+		(macScrollPtr->macFlags & (FLUSH_RIGHT|FLUSH_LEFT))) {
+	    adjust--;
+	}
+	Tk_GeometryRequest(scrollPtr->tkwin,
+		scrollPtr->width + 2*scrollPtr->inset + adjust,
+		2*(scrollPtr->arrowLength + scrollPtr->borderWidth
+		+ scrollPtr->inset));
+    } else {
+	if ((macScrollPtr->macFlags & AUTO_ADJUST) &&
+		(macScrollPtr->macFlags & (FLUSH_TOP|FLUSH_BOTTOM))) {
+	    adjust--;
+	}
+	Tk_GeometryRequest(scrollPtr->tkwin,
+		2*(scrollPtr->arrowLength + scrollPtr->borderWidth
+		+ scrollPtr->inset), scrollPtr->width + 2*scrollPtr->inset + adjust);
+    }
+    Tk_SetInternalBorder(scrollPtr->tkwin, scrollPtr->inset);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TkpDestroyScrollbar --
+ *
+ *	Free data structures associated with the scrollbar control.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+TkpDestroyScrollbar(
+    TkScrollbar *scrollPtr)	/* Scrollbar to destroy. */
+{
+    MacScrollbar *macScrollPtr = (MacScrollbar *)scrollPtr;
+
+    if (macScrollPtr->sbHandle != NULL) {
+	if (!(macScrollPtr->macFlags & IN_MODAL_LOOP)) {
+	    DisposeControl(macScrollPtr->sbHandle);
+	    macScrollPtr->sbHandle = NULL;
+	}
+    }
+    macScrollPtr->macFlags |= ALREADY_DEAD;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * TkpScrollbarPosition --
+ *
+ *	Determine the scrollbar element corresponding to a
+ *	given position.
+ *
+ * Results:
+ *	One of TOP_ARROW, TOP_GAP, etc., indicating which element
+ *	of the scrollbar covers the position given by (x, y).  If
+ *	(x,y) is outside the scrollbar entirely, then OUTSIDE is
+ *	returned.
+ *
+ * Side effects:
+ *	None.
+ *
+ *--------------------------------------------------------------
+ */
+
+int
+TkpScrollbarPosition(
+    TkScrollbar *scrollPtr,	/* Scrollbar widget record. */
+    int x, int y)		/* Coordinates within scrollPtr's
+				 * window. */
+{
+    MacScrollbar *macScrollPtr = (MacScrollbar *) scrollPtr;
+    GWorldPtr destPort;
+    int length, width, tmp, inactive = false;
+    ControlPartCode part;
+    Point where;
+    Rect bounds;
+
+    if (scrollPtr->vertical) {
+	length = Tk_Height(scrollPtr->tkwin);
+	width = Tk_Width(scrollPtr->tkwin);
+    } else {
+	tmp = x;
+	x = y;
+	y = tmp;
+	length = Tk_Width(scrollPtr->tkwin);
+	width = Tk_Height(scrollPtr->tkwin);
+    }
+
+    if ((x < scrollPtr->inset) || (x >= (width - scrollPtr->inset))
+	    || (y < scrollPtr->inset) || (y >= (length - scrollPtr->inset))) {
+	return OUTSIDE;
+    }
+
+    /*
+     * All of the calculations in this procedure mirror those in
+     * DisplayScrollbar.  Be sure to keep the two consistent.  On the 
+     * Macintosh we use the OS call TestControl to do this mapping.
+     * For TestControl to work, the scrollbar must be active and must
+     * be in the current port.
+     */
+
+    destPort = TkMacGetDrawablePort(Tk_WindowId(scrollPtr->tkwin));
+    SetGWorld(destPort, NULL);
+    UpdateControlValues(macScrollPtr);
+    if ((**macScrollPtr->sbHandle).contrlHilite == 255) {
+	inactive = true;
+	(**macScrollPtr->sbHandle).contrlHilite = 0;
+    }
+
+    TkMacWinBounds((TkWindow *) scrollPtr->tkwin, &bounds);		
+    where.h = x + bounds.left;
+    where.v = y + bounds.top;
+    part = TestControl(((MacScrollbar *) scrollPtr)->sbHandle, where);
+    if (inactive) {
+	(**macScrollPtr->sbHandle).contrlHilite = 255;
+    }
+    switch (part) {
+    	case inUpButton:
+	    return TOP_ARROW;
+    	case inPageUp:
+	    return TOP_GAP;
+    	case inThumb:
+	    return SLIDER;
+    	case inPageDown:
+	    return BOTTOM_GAP;
+    	case inDownButton:
+	    return BOTTOM_ARROW;
+    	default:
+	    return OUTSIDE;
+    }
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * ThumbActionProc --
+ *
+ *	Callback procedure used by the Macintosh toolbox call
+ *	TrackControl.  This call is used to track the thumb of
+ *	the scrollbar.  Unlike the ScrollbarActionProc function
+ *	this function is called once and basically takes over
+ *	tracking the scrollbar from the control.  This is done
+ *	to avoid conflicts with what the control plans to draw.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	May change the display.
+ *
+ *--------------------------------------------------------------
+ */
+
+static pascal void
+ThumbActionProc()
+{
+    register TkScrollbar *scrollPtr = activeScrollPtr;
+    register MacScrollbar *macScrollPtr = (MacScrollbar *) activeScrollPtr;
+    Tcl_DString cmdString;
+    Rect nullRect = {0,0,0,0};
+    int origValue, trackBarPin;
+    double thumbWidth, newFirstFraction, trackBarSize;
+    char vauleString[40];
+    Point currentPoint = { 0, 0 };
+    Point lastPoint = { 0, 0 };
+    Rect trackRect;
+    Tcl_Interp *interp;
+    
+    if (scrollPtr == NULL) {
+	return;
+    }
+
+    Tcl_DStringInit(&cmdString);
+    
+    /*
+     * First compute values that will remain constant during the tracking
+     * of the thumb.  The variable trackBarSize is the length of the scrollbar
+     * minus the 2 arrows and half the width of the thumb on both sides
+     * (3 * arrowLength).  The variable trackBarPin is the lower starting point
+     * of the drag region.
+     *
+     * Note: the arrowLength is equal to the thumb width of a Mac scrollbar.
+     */
+    origValue = GetControlValue(macScrollPtr->sbHandle);
+    trackRect = (**macScrollPtr->sbHandle).contrlRect;
+    if (scrollPtr->vertical == true) {
+	trackBarSize = (double) (trackRect.bottom - trackRect.top
+		- (scrollPtr->arrowLength * 3));
+	trackBarPin = trackRect.top + scrollPtr->arrowLength
+	    + (scrollPtr->arrowLength / 2);
+	InsetRect(&trackRect, -25, -113);
+	
+    } else {
+	trackBarSize = (double) (trackRect.right - trackRect.left
+		- (scrollPtr->arrowLength * 3));
+	trackBarPin = trackRect.left + scrollPtr->arrowLength
+	    + (scrollPtr->arrowLength / 2);
+	InsetRect(&trackRect, -113, -25);
+    }
+
+    /*
+     * Track the mouse while the button is held down.  If the mouse is moved,
+     * we calculate the value that should be passed to the "command" part of
+     * the scrollbar.
+     */
+    while (StillDown()) {
+	GetMouse(&currentPoint);
+	if (EqualPt(currentPoint, lastPoint)) {
+	    continue;
+	}
+	lastPoint = currentPoint;
+
+	/*
+	 * Calculating this value is a little tricky.  We need to calculate a
+	 * value for where the thumb would be in a Motif widget (variable
+	 * thumb).  This value is what the "command" expects and is what will
+	 * be resent to the scrollbar to update its value.
+	 */
+	thumbWidth = scrollPtr->lastFraction - scrollPtr->firstFraction;
+	if (PtInRect(currentPoint, &trackRect)) {
+	    if (scrollPtr->vertical == true) {
+		newFirstFraction =  (1.0 - thumbWidth) *
+		    ((double) (currentPoint.v - trackBarPin) / trackBarSize);
+	    } else {
+		newFirstFraction =  (1.0 - thumbWidth) *
+		    ((double) (currentPoint.h - trackBarPin) / trackBarSize);
+	    }
+	} else {
+	    newFirstFraction = ((double) origValue / 1000.0)
+		* (1.0 - thumbWidth);
+	}
+	
+	sprintf(vauleString, "%g", newFirstFraction);
+
+	Tcl_DStringSetLength(&cmdString, 0);
+	Tcl_DStringAppend(&cmdString, scrollPtr->command,
+		scrollPtr->commandSize);
+	Tcl_DStringAppendElement(&cmdString, "moveto");
+	Tcl_DStringAppendElement(&cmdString, vauleString);
+
+        interp = scrollPtr->interp;
+        Tcl_Preserve((ClientData) interp);
+	Tcl_GlobalEval(interp, cmdString.string);
+        Tcl_Release((ClientData) interp);
+	
+	Tcl_DStringSetLength(&cmdString, 0);
+	Tcl_DStringAppend(&cmdString, "update idletasks",
+		strlen("update idletasks"));
+        Tcl_Preserve((ClientData) interp);
+	Tcl_GlobalEval(interp, cmdString.string);
+        Tcl_Release((ClientData) interp);
+    }
+    
+    /*
+     * This next bit of code is a bit of a hack - but needed.  The problem is
+     * that the control wants to draw the drag outline if the control value
+     * changes during the drag (which it does).  What we do here is change the
+     * clip region to hide this drawing from the user.
+     */
+    ClipRect(&nullRect);
+    
+    Tcl_DStringFree(&cmdString);
+    return;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * ScrollbarActionProc --
+ *
+ *	Callback procedure used by the Macintosh toolbox call
+ *	TrackControl.  This call will update the display while
+ *	the scrollbar is being manipulated by the user.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	May change the display.
+ *
+ *--------------------------------------------------------------
+ */
+
+static pascal void
+ScrollbarActionProc(
+    ControlRef theControl, 	/* Handle to scrollbat control */
+    ControlPartCode partCode)	/* Part of scrollbar that was "hit" */
+{
+    register TkScrollbar *scrollPtr = (TkScrollbar *) GetCRefCon(theControl);
+    Tcl_DString cmdString;
+    
+    Tcl_DStringInit(&cmdString);
+    Tcl_DStringAppend(&cmdString, scrollPtr->command,
+	    scrollPtr->commandSize);
+
+    if (partCode == inUpButton || partCode == inDownButton) {
+	Tcl_DStringAppendElement(&cmdString, "scroll");
+	Tcl_DStringAppendElement(&cmdString,
+		(partCode == inUpButton ) ? "-1" : "1");
+	Tcl_DStringAppendElement(&cmdString, "unit");
+    } else if (partCode == inPageUp || partCode == inPageDown) {
+	Tcl_DStringAppendElement(&cmdString, "scroll");
+	Tcl_DStringAppendElement(&cmdString,
+		(partCode == inPageUp ) ? "-1" : "1");
+	Tcl_DStringAppendElement(&cmdString, "page");
+    }
+    Tcl_Preserve((ClientData) scrollPtr->interp);
+    Tcl_DStringAppend(&cmdString, "; update idletasks",
+	strlen("; update idletasks"));
+    Tcl_GlobalEval(scrollPtr->interp, cmdString.string);
+    Tcl_Release((ClientData) scrollPtr->interp);
+
+    Tcl_DStringFree(&cmdString);
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * ScrollbarBindProc --
+ *
+ *	This procedure is invoked when the default <ButtonPress>
+ *	binding on the Scrollbar bind tag fires.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	The event enters a modal loop.
+ *
+ *--------------------------------------------------------------
+ */
+
+static int
+ScrollbarBindProc(
+    ClientData clientData,	/* Not used. */
+    Tcl_Interp *interp,		/* Interp with binding. */
+    XEvent *eventPtr,		/* X event that triggered binding. */
+    Tk_Window tkwin,		/* Target window for event. */
+    KeySym keySym)		/* The KeySym if a key event. */
+{
+    TkWindow *winPtr = (TkWindow*)tkwin;
+    TkScrollbar *scrollPtr = (TkScrollbar *) winPtr->instanceData;
+    MacScrollbar *macScrollPtr = (MacScrollbar *) winPtr->instanceData;
+
+    Tcl_Preserve((ClientData)scrollPtr);
+    macScrollPtr->macFlags |= IN_MODAL_LOOP;
+    
+    if (eventPtr->type == ButtonPress) {
+    	Point where;
+    	Rect bounds;
+    	int part, x, y, dummy;
+    	unsigned int state;
+	CGrafPtr saveWorld;
+	GDHandle saveDevice;
+	GWorldPtr destPort;
+	Window window;
+
+	/*
+	 * To call Macintosh control routines we must have the port
+	 * set to the window containing the control.  We will then test
+	 * which part of the control was hit and act accordingly.
+	 */
+	destPort = TkMacGetDrawablePort(Tk_WindowId(scrollPtr->tkwin));
+	GetGWorld(&saveWorld, &saveDevice);
+	SetGWorld(destPort, NULL);
+	TkMacSetUpClippingRgn(Tk_WindowId(scrollPtr->tkwin));
+
+	TkMacWinBounds((TkWindow *) scrollPtr->tkwin, &bounds);		
+    	where.h = eventPtr->xbutton.x + bounds.left;
+    	where.v = eventPtr->xbutton.y + bounds.top;
+	part = TestControl(macScrollPtr->sbHandle, where);
+	if (part == inThumb && scrollPtr->jump == false) {
+	    /*
+	     * Case 1: In thumb, no jump scrolling.  Call track control
+	     * with the thumb action proc which will do most of the work.
+	     * Set the global activeScrollPtr to the current control
+	     * so the callback may have access to it.
+	     */
+	    activeScrollPtr = scrollPtr;
+	    part = TrackControl(macScrollPtr->sbHandle, where,
+		    (ControlActionUPP) thumbActionProc);
+	    activeScrollPtr = NULL;
+	} else if (part == inThumb) {
+	    /*
+	     * Case 2: in thumb with jump scrolling.  Call TrackControl
+	     * with a NULL action proc.  Use the new value of the control
+	     * to set update the control.
+	     */
+	    part = TrackControl(macScrollPtr->sbHandle, where, NULL);
+	    if (part == inThumb) {
+	    	double newFirstFraction, thumbWidth;
+		Tcl_DString cmdString;
+		char vauleString[TCL_DOUBLE_SPACE];
+
+		/*
+		 * The following calculation takes the new control
+		 * value and maps it to what Tk needs for its variable
+		 * thumb size representation.
+		 */
+		thumbWidth = scrollPtr->lastFraction
+		     - scrollPtr->firstFraction;
+		newFirstFraction = (1.0 - thumbWidth) *
+		    ((double) GetControlValue(macScrollPtr->sbHandle) / 1000.0);
+		sprintf(vauleString, "%g", newFirstFraction);
+
+		Tcl_DStringInit(&cmdString);
+		Tcl_DStringAppend(&cmdString, scrollPtr->command,
+			strlen(scrollPtr->command));
+		Tcl_DStringAppendElement(&cmdString, "moveto");
+		Tcl_DStringAppendElement(&cmdString, vauleString);
+		Tcl_DStringAppend(&cmdString, "; update idletasks",
+			strlen("; update idletasks"));
+		
+                interp = scrollPtr->interp;
+                Tcl_Preserve((ClientData) interp);
+		Tcl_GlobalEval(interp, cmdString.string);
+                Tcl_Release((ClientData) interp);
+		Tcl_DStringFree(&cmdString);		
+	    }
+	} else if (part != 0) {
+	    /*
+	     * Case 3: in any other part of the scrollbar.  We call
+	     * TrackControl with the scrollActionProc which will do
+	     * most all the work.
+	     */
+	    TrackControl(macScrollPtr->sbHandle, where, scrollActionProc);
+	    HiliteControl(macScrollPtr->sbHandle, 0);
+	}
+	
+	/*
+	 * The TrackControl call will "eat" the ButtonUp event.  We now
+	 * generate a ButtonUp event so Tk will unset implicit grabs etc.
+	 */
+	GetMouse(&where);
+	XQueryPointer(NULL, None, &window, &window, &x,
+	    &y, &dummy, &dummy, &state);
+	window = Tk_WindowId(scrollPtr->tkwin);
+	TkGenerateButtonEvent(x, y, window, state);
+
+	SetGWorld(saveWorld, saveDevice);
+    }
+
+    if (macScrollPtr->sbHandle && (macScrollPtr->macFlags & ALREADY_DEAD)) {
+	DisposeControl(macScrollPtr->sbHandle);
+	macScrollPtr->sbHandle = NULL;
+    }
+    macScrollPtr->macFlags &= ~IN_MODAL_LOOP;
+    Tcl_Release((ClientData)scrollPtr);
+    
+    return TCL_OK;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * ScrollbarEventProc --
+ *
+ *	This procedure is invoked by the Tk dispatcher for various
+ *	events on scrollbars.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	When the window gets deleted, internal structures get
+ *	cleaned up.  When it gets exposed, it is redisplayed.
+ *
+ *--------------------------------------------------------------
+ */
+
+static void
+ScrollbarEventProc(
+    ClientData clientData,	/* Information about window. */
+    XEvent *eventPtr)		/* Information about event. */
+{
+    TkScrollbar *scrollPtr = (TkScrollbar *) clientData;
+    MacScrollbar *macScrollPtr = (MacScrollbar *) clientData;
+
+    if (eventPtr->type == UnmapNotify) {
+	TkMacSetScrollbarGrow((TkWindow *) scrollPtr->tkwin, false);
+    } else if (eventPtr->type == ActivateNotify) {
+	macScrollPtr->macFlags |= ACTIVE;
+	TkScrollbarEventuallyRedraw((ClientData) scrollPtr);
+    } else if (eventPtr->type == DeactivateNotify) {
+	macScrollPtr->macFlags &= ~ACTIVE;
+	TkScrollbarEventuallyRedraw((ClientData) scrollPtr);
+    } else {
+	TkScrollbarEventProc(clientData, eventPtr);
+    }
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * UpdateControlValues --
+ *
+ *	This procedure updates the Macintosh scrollbar control
+ *	to display the values defined by the Tk scrollbar.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	The Macintosh control is updated.
+ *
+ *--------------------------------------------------------------
+ */
+
+static void
+UpdateControlValues(
+    MacScrollbar *macScrollPtr)		/* Scrollbar data struct. */
+{
+    TkScrollbar *scrollPtr = (TkScrollbar *) macScrollPtr;
+    Tk_Window tkwin = scrollPtr->tkwin;
+    MacDrawable * macDraw = (MacDrawable *) Tk_WindowId(scrollPtr->tkwin);
+    WindowRef windowRef  = (**macScrollPtr->sbHandle).contrlOwner;    
+    double middle;
+    int drawGrowRgn = false;
+    int flushRight = false;
+    int flushBottom = false;
+
+    /*
+     * We can't use the Macintosh commands SizeControl and MoveControl as these
+     * calls will also cause a redraw which in our case will also cause
+     * flicker.  To avoid this we adjust the control record directly.  The
+     * Draw1Control command appears to just draw where ever the control says to
+     * draw so this seems right.
+     *
+     * NOTE: changing the control record directly may not work when
+     * Apple releases the Copland version of the MacOS (or when hell is cold).
+     */
+     
+    (**macScrollPtr->sbHandle).contrlRect.left = macDraw->xOff + scrollPtr->inset;
+    (**macScrollPtr->sbHandle).contrlRect.top = macDraw->yOff + scrollPtr->inset;
+    (**macScrollPtr->sbHandle).contrlRect.right = macDraw->xOff + Tk_Width(tkwin)
+	- scrollPtr->inset;
+    (**macScrollPtr->sbHandle).contrlRect.bottom = macDraw->yOff +
+	Tk_Height(tkwin) - scrollPtr->inset;
+    
+    /*
+     * To make Tk applications look more like Macintosh applications without 
+     * requiring additional work by the Tk developer we do some cute tricks.
+     * The first trick plays with the size of the widget to get it to overlap
+     * with the side of the window by one pixel (we don't do this if the placer
+     * is the geometry manager).  The second trick shrinks the scrollbar if it
+     * it covers the area of the grow region ao the scrollbar can also draw
+     * the grow region if need be.
+     */
+    if (!strcmp(macDraw->winPtr->geomMgrPtr->name, "place")) {
+	macScrollPtr->macFlags &= AUTO_ADJUST;
+    } else {
+	macScrollPtr->macFlags |= AUTO_ADJUST;
+    }
+    /* TODO: use accessor function!!! */
+    if (windowRef->portRect.left == (**macScrollPtr->sbHandle).contrlRect.left) {
+	if (macScrollPtr->macFlags & AUTO_ADJUST) {
+	    (**macScrollPtr->sbHandle).contrlRect.left--;
+	}
+	if (!(macScrollPtr->macFlags & FLUSH_LEFT)) {
+	    macScrollPtr->macFlags |= FLUSH_LEFT;
+	    if (scrollPtr->vertical) {
+		TkpComputeScrollbarGeometry(scrollPtr);
+	    }
+	}
+    } else if (macScrollPtr->macFlags & FLUSH_LEFT) {
+	macScrollPtr->macFlags &= ~FLUSH_LEFT;
+	if (scrollPtr->vertical) {
+	    TkpComputeScrollbarGeometry(scrollPtr);
+	}
+    }
+    
+    if (windowRef->portRect.top == (**macScrollPtr->sbHandle).contrlRect.top) {
+	if (macScrollPtr->macFlags & AUTO_ADJUST) {
+	    (**macScrollPtr->sbHandle).contrlRect.top--;
+	}
+	if (!(macScrollPtr->macFlags & FLUSH_TOP)) {
+	    macScrollPtr->macFlags |= FLUSH_TOP;
+	    if (! scrollPtr->vertical) {
+		TkpComputeScrollbarGeometry(scrollPtr);
+	    }
+	}
+    } else if (macScrollPtr->macFlags & FLUSH_TOP) {
+	macScrollPtr->macFlags &= ~FLUSH_TOP;
+	if (! scrollPtr->vertical) {
+	    TkpComputeScrollbarGeometry(scrollPtr);
+	}
+    }
+	
+    if (windowRef->portRect.right == (**macScrollPtr->sbHandle).contrlRect.right) {
+	flushRight = true;
+	if (macScrollPtr->macFlags & AUTO_ADJUST) {
+	    (**macScrollPtr->sbHandle).contrlRect.right++;
+	}
+	if (!(macScrollPtr->macFlags & FLUSH_RIGHT)) {
+	    macScrollPtr->macFlags |= FLUSH_RIGHT;
+	    if (scrollPtr->vertical) {
+		TkpComputeScrollbarGeometry(scrollPtr);
+	    }
+	}
+    } else if (macScrollPtr->macFlags & FLUSH_RIGHT) {
+	macScrollPtr->macFlags &= ~FLUSH_RIGHT;
+	if (scrollPtr->vertical) {
+	    TkpComputeScrollbarGeometry(scrollPtr);
+	}
+    }
+	
+    if (windowRef->portRect.bottom == (**macScrollPtr->sbHandle).contrlRect.bottom) {
+	flushBottom = true;
+	if (macScrollPtr->macFlags & AUTO_ADJUST) {
+	    (**macScrollPtr->sbHandle).contrlRect.bottom++;
+	}
+	if (!(macScrollPtr->macFlags & FLUSH_BOTTOM)) {
+	    macScrollPtr->macFlags |= FLUSH_BOTTOM;
+	    if (! scrollPtr->vertical) {
+		TkpComputeScrollbarGeometry(scrollPtr);
+	    }
+	}
+    } else if (macScrollPtr->macFlags & FLUSH_BOTTOM) {
+	macScrollPtr->macFlags &= ~FLUSH_BOTTOM;
+	if (! scrollPtr->vertical) {
+	    TkpComputeScrollbarGeometry(scrollPtr);
+	}
+    }
+
+    /*
+     * If the scrollbar is flush against the bottom right hand coner then
+     * it may need to draw the grow region for the window so we let the
+     * wm code know about this scrollbar.  We don't actually draw the grow
+     * region, however, unless we are currently resizable.
+     */
+    macScrollPtr->macFlags &= ~DRAW_GROW;
+    if (flushBottom && flushRight) {
+	TkMacSetScrollbarGrow((TkWindow *) tkwin, true);
+	if (TkMacResizable(macDraw->toplevel->winPtr)) {
+	    if (scrollPtr->vertical) {
+		(**macScrollPtr->sbHandle).contrlRect.bottom -= 14;
+	    } else {
+		(**macScrollPtr->sbHandle).contrlRect.right -= 14;
+	    }
+	    macScrollPtr->macFlags |= DRAW_GROW;
+	}
+    } else {
+	TkMacSetScrollbarGrow((TkWindow *) tkwin, false);
+    }
+    
+    /*
+     * Given the Tk parameters for the fractions of the start and
+     * end of the thumb, the following calculation determines the
+     * location for the fixed sized Macintosh thumb.
+     */
+    middle = scrollPtr->firstFraction / (scrollPtr->firstFraction +
+	    (1.0 - scrollPtr->lastFraction));
+
+    (**macScrollPtr->sbHandle).contrlValue = (short) (middle * 1000);
+    if ((**macScrollPtr->sbHandle).contrlHilite == 0 || 
+		(**macScrollPtr->sbHandle).contrlHilite == 255) {
+	if (scrollPtr->firstFraction == 0.0 &&
+		scrollPtr->lastFraction == 1.0) {
+	    (**macScrollPtr->sbHandle).contrlHilite = 255;
+	} else {
+	    (**macScrollPtr->sbHandle).contrlHilite = 0;
+	}
+    }
+    if ((**macScrollPtr->sbHandle).contrlVis != 255) {
+	(**macScrollPtr->sbHandle).contrlVis = 255;
+    }
+}