746 lines
19 KiB
C
746 lines
19 KiB
C
/*
|
||
* tkWinScrollbar.c --
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*
|
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* This file implements the Windows specific portion of the scrollbar
|
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* widget.
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*
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* Copyright (c) 1996 by Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
|
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tkWinScrlbr.c 1.19 97/08/13 17:37:49
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*/
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||
|
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#include "tkWinInt.h"
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#include "tkScrollbar.h"
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/*
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* The following constant is used to specify the maximum scroll position.
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* This value is limited by the Win32 API to either 16-bits or 32-bits,
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* depending on the context. For now we'll just use a value small
|
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* enough to fit in 16-bits, but which gives us 4-digits of precision.
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*/
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#define MAX_SCROLL 10000
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/*
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* Declaration of Windows specific scrollbar structure.
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*/
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typedef struct WinScrollbar {
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TkScrollbar info; /* Generic scrollbar info. */
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WNDPROC oldProc; /* Old window procedure. */
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int lastVertical; /* 1 if was vertical at last refresh. */
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HWND hwnd; /* Current window handle. */
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int winFlags; /* Various flags; see below. */
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} WinScrollbar;
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/*
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* Flag bits for native scrollbars:
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*
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* IN_MODAL_LOOP: Non-zero means this scrollbar is in the middle
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* of a modal loop.
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* ALREADY_DEAD: Non-zero means this scrollbar has been
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* destroyed, but has not been cleaned up.
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*/
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#define IN_MODAL_LOOP 1
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#define ALREADY_DEAD 2
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/*
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* Cached system metrics used to determine scrollbar geometry.
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*/
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static int initialized = 0;
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static int hArrowWidth, hThumb; /* Horizontal control metrics. */
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static int vArrowWidth, vArrowHeight, vThumb; /* Vertical control metrics. */
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/*
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* This variable holds the default width for a scrollbar in string
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* form for use in a Tk_ConfigSpec.
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*/
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static char defWidth[8];
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/*
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* Declarations for functions defined in this file.
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*/
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static Window CreateProc _ANSI_ARGS_((Tk_Window tkwin,
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Window parent, ClientData instanceData));
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static void ModalLoopProc _ANSI_ARGS_((Tk_Window tkwin,
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XEvent *eventPtr));
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static int ScrollbarBindProc _ANSI_ARGS_((ClientData clientData,
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Tcl_Interp *interp, XEvent *eventPtr,
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Tk_Window tkwin, KeySym keySym));
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static LRESULT CALLBACK ScrollbarProc _ANSI_ARGS_((HWND hwnd, UINT message,
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WPARAM wParam, LPARAM lParam));
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static void UpdateScrollbar _ANSI_ARGS_((
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WinScrollbar *scrollPtr));
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static void UpdateScrollbarMetrics _ANSI_ARGS_((void));
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/*
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* The class procedure table for the scrollbar widget.
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*/
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TkClassProcs tkpScrollbarProcs = {
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CreateProc, /* createProc */
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NULL, /* geometryProc */
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ModalLoopProc, /* modalProc */
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};
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/*
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*----------------------------------------------------------------------
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*
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* TkpCreateScrollbar --
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*
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* Allocate a new TkScrollbar structure.
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*
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* Results:
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* Returns a newly allocated TkScrollbar structure.
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*
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* Side effects:
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* Registers an event handler for the widget.
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*
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*----------------------------------------------------------------------
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*/
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TkScrollbar *
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TkpCreateScrollbar(tkwin)
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Tk_Window tkwin;
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{
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WinScrollbar *scrollPtr;
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TkWindow *winPtr = (TkWindow *)tkwin;
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if (!initialized) {
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UpdateScrollbarMetrics();
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initialized = 1;
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}
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scrollPtr = (WinScrollbar *) ckalloc(sizeof(WinScrollbar));
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scrollPtr->winFlags = 0;
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scrollPtr->hwnd = NULL;
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Tk_CreateEventHandler(tkwin,
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ExposureMask|StructureNotifyMask|FocusChangeMask,
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TkScrollbarEventProc, (ClientData) scrollPtr);
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if (!Tcl_GetAssocData(winPtr->mainPtr->interp, "TkScrollbar", NULL)) {
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Tcl_SetAssocData(winPtr->mainPtr->interp, "TkScrollbar", NULL,
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(ClientData)1);
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TkCreateBindingProcedure(winPtr->mainPtr->interp,
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winPtr->mainPtr->bindingTable,
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(ClientData)Tk_GetUid("Scrollbar"), "<ButtonPress>",
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ScrollbarBindProc, NULL, NULL);
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}
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return (TkScrollbar*) scrollPtr;
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}
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/*
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*----------------------------------------------------------------------
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*
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* UpdateScrollbar --
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*
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* This function updates the position and size of the scrollbar
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* thumb based on the current settings.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Moves the thumb.
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*
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*----------------------------------------------------------------------
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*/
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static void
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UpdateScrollbar(scrollPtr)
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WinScrollbar *scrollPtr;
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{
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SCROLLINFO scrollInfo;
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double thumbSize;
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/*
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* Update the current scrollbar position and shape.
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*/
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scrollInfo.fMask = SIF_PAGE | SIF_POS | SIF_RANGE;
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scrollInfo.cbSize = sizeof(scrollInfo);
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scrollInfo.nMin = 0;
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scrollInfo.nMax = MAX_SCROLL;
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thumbSize = (scrollPtr->info.lastFraction - scrollPtr->info.firstFraction);
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if (tkpIsWin32s) {
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scrollInfo.nPage = 0;
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} else {
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scrollInfo.nPage = ((UINT) (thumbSize * (double) MAX_SCROLL)) + 1;
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}
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if (thumbSize < 1.0) {
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scrollInfo.nPos = (int)
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((scrollPtr->info.firstFraction / (1.0-thumbSize))
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* (MAX_SCROLL - (scrollInfo.nPage - 1)));
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} else {
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scrollInfo.nPos = 0;
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}
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SetScrollInfo(scrollPtr->hwnd, SB_CTL, &scrollInfo, TRUE);
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}
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/*
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*----------------------------------------------------------------------
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*
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* CreateProc --
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*
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* This function creates a new Scrollbar control, subclasses
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* the instance, and generates a new Window object.
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*
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* Results:
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* Returns the newly allocated Window object, or None on failure.
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*
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* Side effects:
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* Causes a new Scrollbar control to come into existence.
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*
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*----------------------------------------------------------------------
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*/
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static Window
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CreateProc(tkwin, parentWin, instanceData)
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Tk_Window tkwin; /* Token for window. */
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Window parentWin; /* Parent of new window. */
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ClientData instanceData; /* Scrollbar instance data. */
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{
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DWORD style;
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Window window;
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HWND parent;
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TkWindow *winPtr;
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WinScrollbar *scrollPtr = (WinScrollbar *)instanceData;
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parent = Tk_GetHWND(parentWin);
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if (scrollPtr->info.vertical) {
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style = WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN | WS_CLIPSIBLINGS
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| SBS_VERT | SBS_RIGHTALIGN;
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} else {
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style = WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN | WS_CLIPSIBLINGS
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| SBS_HORZ | SBS_BOTTOMALIGN;
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}
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scrollPtr->hwnd = CreateWindow("SCROLLBAR", NULL, style,
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Tk_X(tkwin), Tk_Y(tkwin), Tk_Width(tkwin), Tk_Height(tkwin),
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parent, NULL, Tk_GetHINSTANCE(), NULL);
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/*
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* Ensure new window is inserted into the stacking order at the correct
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* place.
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*/
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SetWindowPos(scrollPtr->hwnd, HWND_TOP, 0, 0, 0, 0,
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SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE);
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for (winPtr = ((TkWindow*)tkwin)->nextPtr; winPtr != NULL;
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winPtr = winPtr->nextPtr) {
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if ((winPtr->window != None) && !(winPtr->flags & TK_TOP_LEVEL)) {
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TkWinSetWindowPos(scrollPtr->hwnd, Tk_GetHWND(winPtr->window),
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Below);
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break;
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}
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}
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scrollPtr->lastVertical = scrollPtr->info.vertical;
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scrollPtr->oldProc = (WNDPROC)SetWindowLong(scrollPtr->hwnd, GWL_WNDPROC,
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(DWORD) ScrollbarProc);
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window = Tk_AttachHWND(tkwin, scrollPtr->hwnd);
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UpdateScrollbar(scrollPtr);
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return window;
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}
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/*
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*--------------------------------------------------------------
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*
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* TkpDisplayScrollbar --
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*
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* This procedure redraws the contents of a scrollbar window.
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* It is invoked as a do-when-idle handler, so it only runs
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* when there's nothing else for the application to do.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Information appears on the screen.
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*
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*--------------------------------------------------------------
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*/
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void
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TkpDisplayScrollbar(clientData)
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ClientData clientData; /* Information about window. */
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{
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WinScrollbar *scrollPtr = (WinScrollbar *) clientData;
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Tk_Window tkwin = scrollPtr->info.tkwin;
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scrollPtr->info.flags &= ~REDRAW_PENDING;
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if ((tkwin == NULL) || !Tk_IsMapped(tkwin)) {
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return;
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}
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/*
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* Destroy and recreate the scrollbar control if the orientation
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* has changed.
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*/
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if (scrollPtr->lastVertical != scrollPtr->info.vertical) {
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HWND hwnd = Tk_GetHWND(Tk_WindowId(tkwin));
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SetWindowLong(hwnd, GWL_WNDPROC, (DWORD) scrollPtr->oldProc);
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DestroyWindow(hwnd);
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CreateProc(tkwin, Tk_WindowId(Tk_Parent(tkwin)),
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(ClientData) scrollPtr);
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} else {
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UpdateScrollbar(scrollPtr);
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}
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkpDestroyScrollbar --
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*
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* Free data structures associated with the scrollbar control.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Restores the default control state.
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*
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*----------------------------------------------------------------------
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*/
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void
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TkpDestroyScrollbar(scrollPtr)
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TkScrollbar *scrollPtr;
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{
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WinScrollbar *winScrollPtr = (WinScrollbar *)scrollPtr;
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HWND hwnd = winScrollPtr->hwnd;
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if (hwnd) {
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SetWindowLong(hwnd, GWL_WNDPROC, (DWORD) winScrollPtr->oldProc);
|
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if (winScrollPtr->winFlags & IN_MODAL_LOOP) {
|
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((TkWindow *)scrollPtr->tkwin)->flags |= TK_DONT_DESTROY_WINDOW;
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SetParent(hwnd, NULL);
|
||
}
|
||
}
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winScrollPtr->winFlags |= ALREADY_DEAD;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* UpdateScrollbarMetrics --
|
||
*
|
||
* This function retrieves the current system metrics for a
|
||
* scrollbar.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Updates the geometry cache info for all scrollbars.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
UpdateScrollbarMetrics()
|
||
{
|
||
Tk_ConfigSpec *specPtr;
|
||
|
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hArrowWidth = GetSystemMetrics(SM_CXHSCROLL);
|
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hThumb = GetSystemMetrics(SM_CXHTHUMB);
|
||
vArrowWidth = GetSystemMetrics(SM_CXVSCROLL);
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||
vArrowHeight = GetSystemMetrics(SM_CYVSCROLL);
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vThumb = GetSystemMetrics(SM_CYVTHUMB);
|
||
|
||
sprintf(defWidth, "%d", vArrowWidth);
|
||
for (specPtr = tkpScrollbarConfigSpecs; specPtr->type != TK_CONFIG_END;
|
||
specPtr++) {
|
||
if (specPtr->offset == Tk_Offset(TkScrollbar, width)) {
|
||
specPtr->defValue = defWidth;
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* 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(scrollPtr)
|
||
register TkScrollbar *scrollPtr; /* Scrollbar whose geometry may
|
||
* have changed. */
|
||
{
|
||
int fieldLength, minThumbSize;
|
||
|
||
/*
|
||
* Windows doesn't use focus rings on scrollbars, but we still
|
||
* perform basic sanity checks to appease backwards compatibility.
|
||
*/
|
||
|
||
if (scrollPtr->highlightWidth < 0) {
|
||
scrollPtr->highlightWidth = 0;
|
||
}
|
||
|
||
if (scrollPtr->vertical) {
|
||
scrollPtr->arrowLength = vArrowHeight;
|
||
fieldLength = Tk_Height(scrollPtr->tkwin);
|
||
minThumbSize = vThumb;
|
||
} else {
|
||
scrollPtr->arrowLength = hArrowWidth;
|
||
fieldLength = Tk_Width(scrollPtr->tkwin);
|
||
minThumbSize = hThumb;
|
||
}
|
||
fieldLength -= 2*scrollPtr->arrowLength;
|
||
if (fieldLength < 0) {
|
||
fieldLength = 0;
|
||
}
|
||
scrollPtr->sliderFirst = (int) ((double)fieldLength
|
||
* scrollPtr->firstFraction);
|
||
scrollPtr->sliderLast = (int) ((double)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) {
|
||
scrollPtr->sliderFirst = fieldLength;
|
||
}
|
||
if (scrollPtr->sliderFirst < 0) {
|
||
scrollPtr->sliderFirst = 0;
|
||
}
|
||
if (scrollPtr->sliderLast < (scrollPtr->sliderFirst
|
||
+ minThumbSize)) {
|
||
scrollPtr->sliderLast = scrollPtr->sliderFirst + minThumbSize;
|
||
}
|
||
if (scrollPtr->sliderLast > fieldLength) {
|
||
scrollPtr->sliderLast = fieldLength;
|
||
}
|
||
scrollPtr->sliderFirst += scrollPtr->arrowLength;
|
||
scrollPtr->sliderLast += scrollPtr->arrowLength;
|
||
|
||
/*
|
||
* 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) {
|
||
Tk_GeometryRequest(scrollPtr->tkwin,
|
||
scrollPtr->width, 2*scrollPtr->arrowLength + minThumbSize);
|
||
} else {
|
||
Tk_GeometryRequest(scrollPtr->tkwin,
|
||
2*scrollPtr->arrowLength + minThumbSize, scrollPtr->width);
|
||
}
|
||
Tk_SetInternalBorder(scrollPtr->tkwin, 0);
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* ScrollbarProc --
|
||
*
|
||
* This function is call by Windows whenever an event occurs on
|
||
* a scrollbar control created by Tk.
|
||
*
|
||
* Results:
|
||
* Standard Windows return value.
|
||
*
|
||
* Side effects:
|
||
* May generate events.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static LRESULT CALLBACK
|
||
ScrollbarProc(hwnd, message, wParam, lParam)
|
||
HWND hwnd;
|
||
UINT message;
|
||
WPARAM wParam;
|
||
LPARAM lParam;
|
||
{
|
||
LRESULT result;
|
||
POINT point;
|
||
WinScrollbar *scrollPtr;
|
||
Tk_Window tkwin = Tk_HWNDToWindow(hwnd);
|
||
|
||
if (tkwin == NULL) {
|
||
panic("ScrollbarProc called on an invalid HWND");
|
||
}
|
||
scrollPtr = (WinScrollbar *)((TkWindow*)tkwin)->instanceData;
|
||
|
||
switch(message) {
|
||
case WM_HSCROLL:
|
||
case WM_VSCROLL: {
|
||
Tcl_Interp *interp;
|
||
Tcl_DString cmdString;
|
||
int command = LOWORD(wParam);
|
||
int code;
|
||
|
||
GetCursorPos(&point);
|
||
Tk_TranslateWinEvent(NULL, WM_MOUSEMOVE, 0,
|
||
MAKELPARAM(point.x, point.y), &result);
|
||
|
||
if (command == SB_ENDSCROLL) {
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Bail out immediately if there isn't a command to invoke.
|
||
*/
|
||
|
||
if (scrollPtr->info.commandSize == 0) {
|
||
Tcl_ServiceAll();
|
||
return 0;
|
||
}
|
||
|
||
Tcl_DStringInit(&cmdString);
|
||
Tcl_DStringAppend(&cmdString, scrollPtr->info.command,
|
||
scrollPtr->info.commandSize);
|
||
|
||
if (command == SB_LINELEFT || command == SB_LINERIGHT) {
|
||
Tcl_DStringAppendElement(&cmdString, "scroll");
|
||
Tcl_DStringAppendElement(&cmdString,
|
||
(command == SB_LINELEFT ) ? "-1" : "1");
|
||
Tcl_DStringAppendElement(&cmdString, "units");
|
||
} else if (command == SB_PAGELEFT || command == SB_PAGERIGHT) {
|
||
Tcl_DStringAppendElement(&cmdString, "scroll");
|
||
Tcl_DStringAppendElement(&cmdString,
|
||
(command == SB_PAGELEFT ) ? "-1" : "1");
|
||
Tcl_DStringAppendElement(&cmdString, "pages");
|
||
} else {
|
||
char valueString[TCL_DOUBLE_SPACE];
|
||
double pos = 0.0;
|
||
switch (command) {
|
||
case SB_THUMBPOSITION:
|
||
pos = ((double)HIWORD(wParam)) / MAX_SCROLL;
|
||
break;
|
||
|
||
case SB_THUMBTRACK:
|
||
pos = ((double)HIWORD(wParam)) / MAX_SCROLL;
|
||
break;
|
||
|
||
case SB_TOP:
|
||
pos = 0.0;
|
||
break;
|
||
|
||
case SB_BOTTOM:
|
||
pos = 1.0;
|
||
break;
|
||
}
|
||
sprintf(valueString, "%g", pos);
|
||
Tcl_DStringAppendElement(&cmdString, "moveto");
|
||
Tcl_DStringAppendElement(&cmdString, valueString);
|
||
}
|
||
|
||
interp = scrollPtr->info.interp;
|
||
code = Tcl_GlobalEval(interp, cmdString.string);
|
||
if (code != TCL_OK && code != TCL_CONTINUE && code != TCL_BREAK) {
|
||
Tcl_AddErrorInfo(interp, "\n (scrollbar command)");
|
||
Tcl_BackgroundError(interp);
|
||
}
|
||
Tcl_DStringFree(&cmdString);
|
||
|
||
Tcl_ServiceAll();
|
||
return 0;
|
||
}
|
||
|
||
default:
|
||
if (Tk_TranslateWinEvent(hwnd, message, wParam, lParam, &result)) {
|
||
return result;
|
||
}
|
||
}
|
||
return CallWindowProc(scrollPtr->oldProc, hwnd, message, wParam, lParam);
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* 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. */
|
||
{
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* 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, interp, eventPtr, tkwin, keySym)
|
||
ClientData clientData;
|
||
Tcl_Interp *interp;
|
||
XEvent *eventPtr;
|
||
Tk_Window tkwin;
|
||
KeySym keySym;
|
||
{
|
||
TkWindow *winPtr = (TkWindow*)tkwin;
|
||
if (eventPtr->type == ButtonPress) {
|
||
winPtr->flags |= TK_DEFER_MODAL;
|
||
}
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* ModalLoopProc --
|
||
*
|
||
* This function is invoked at the end of the event processing
|
||
* whenever the ScrollbarBindProc has been invoked for a ButtonPress
|
||
* event.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Enters a modal loop.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
ModalLoopProc(tkwin, eventPtr)
|
||
Tk_Window tkwin;
|
||
XEvent *eventPtr;
|
||
{
|
||
TkWindow *winPtr = (TkWindow*)tkwin;
|
||
WinScrollbar *scrollPtr = (WinScrollbar *) winPtr->instanceData;
|
||
int oldMode;
|
||
|
||
Tcl_Preserve((ClientData)scrollPtr);
|
||
scrollPtr->winFlags |= IN_MODAL_LOOP;
|
||
oldMode = Tcl_SetServiceMode(TCL_SERVICE_ALL);
|
||
TkWinResendEvent(scrollPtr->oldProc, scrollPtr->hwnd, eventPtr);
|
||
(void) Tcl_SetServiceMode(oldMode);
|
||
scrollPtr->winFlags &= ~IN_MODAL_LOOP;
|
||
if (scrollPtr->hwnd && scrollPtr->winFlags & ALREADY_DEAD) {
|
||
DestroyWindow(scrollPtr->hwnd);
|
||
}
|
||
Tcl_Release((ClientData)scrollPtr);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* 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(scrollPtr, x, y)
|
||
register TkScrollbar *scrollPtr; /* Scrollbar widget record. */
|
||
int x, y; /* Coordinates within scrollPtr's
|
||
* window. */
|
||
{
|
||
int length, width, tmp;
|
||
|
||
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
|
||
* TkpDisplayScrollbar. Be sure to keep the two consistent.
|
||
*/
|
||
|
||
if (y < (scrollPtr->inset + scrollPtr->arrowLength)) {
|
||
return TOP_ARROW;
|
||
}
|
||
if (y < scrollPtr->sliderFirst) {
|
||
return TOP_GAP;
|
||
}
|
||
if (y < scrollPtr->sliderLast) {
|
||
return SLIDER;
|
||
}
|
||
if (y >= (length - (scrollPtr->arrowLength + scrollPtr->inset))) {
|
||
return BOTTOM_ARROW;
|
||
}
|
||
return BOTTOM_GAP;
|
||
}
|