702 lines
18 KiB
C
702 lines
18 KiB
C
/*
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* 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 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution of
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* this file, and for a DISCLAIMER OF ALL WARRANTIES.
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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. This
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* value is limited by the Win32 API to either 16-bits or 32-bits, depending
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* on the context. For now we'll just use a value small enough to fit in
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* 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 vArrowHeight, vThumb; /* Vertical control metrics. */
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TCL_DECLARE_MUTEX(winScrlbrMutex)
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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(Tk_Window tkwin, Window parent,
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ClientData instanceData);
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static void ModalLoop(WinScrollbar *, XEvent *eventPtr);
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static LRESULT CALLBACK ScrollbarProc(HWND hwnd, UINT message, WPARAM wParam,
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LPARAM lParam);
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static void UpdateScrollbar(WinScrollbar *scrollPtr);
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static void UpdateScrollbarMetrics(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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const Tk_ClassProcs tkpScrollbarProcs = {
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sizeof(Tk_ClassProcs), /* size */
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NULL, /* worldChangedProc */
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CreateProc, /* createProc */
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NULL /* modalProc */
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};
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static void
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WinScrollbarEventProc(ClientData clientData, XEvent *eventPtr)
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{
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WinScrollbar *scrollPtr = (WinScrollbar *)clientData;
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if (eventPtr->type == ButtonPress) {
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ModalLoop(scrollPtr, eventPtr);
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} else {
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TkScrollbarEventProc(clientData, eventPtr);
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}
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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(
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Tk_Window tkwin)
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{
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WinScrollbar *scrollPtr;
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if (!initialized) {
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Tcl_MutexLock(&winScrlbrMutex);
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UpdateScrollbarMetrics();
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initialized = 1;
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Tcl_MutexUnlock(&winScrlbrMutex);
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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|ButtonPressMask,
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WinScrollbarEventProc, scrollPtr);
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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 thumb
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* 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(
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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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scrollInfo.nPage = ((UINT) (thumbSize * (double) MAX_SCROLL)) + 1;
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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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* Disable the scrollbar when there is nothing to scroll. This is
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* standard Windows style (see eg Notepad). Also prevents possible
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* crash on XP+ systems [Bug #624116].
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*/
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scrollInfo.fMask |= SIF_DISABLENOSCROLL;
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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 the
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* 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(
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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;
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} else {
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style = WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN | WS_CLIPSIBLINGS
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| SBS_HORZ;
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}
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scrollPtr->hwnd = CreateWindowW(L"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_HIERARCHY)) {
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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)SetWindowLongPtrW(scrollPtr->hwnd,
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GWLP_WNDPROC, (LONG_PTR) 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. It is
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* invoked as a do-when-idle handler, so it only runs when there's
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* 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(
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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 has
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* 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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SetWindowLongPtrW(hwnd, GWLP_WNDPROC, (LONG_PTR) scrollPtr->oldProc);
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DestroyWindow(hwnd);
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CreateProc(tkwin, Tk_WindowId(Tk_Parent(tkwin)),
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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(
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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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SetWindowLongPtrW(hwnd, GWLP_WNDPROC, (INT_PTR) 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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}
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}
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winScrollPtr->winFlags |= ALREADY_DEAD;
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}
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/*
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*----------------------------------------------------------------------
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*
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* UpdateScrollbarMetrics --
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*
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* This function retrieves the current system metrics for a scrollbar.
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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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* Updates the geometry cache info for all scrollbars.
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*
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*----------------------------------------------------------------------
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*/
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void
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UpdateScrollbarMetrics(void)
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{
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int arrowWidth = GetSystemMetrics(SM_CXVSCROLL);
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hArrowWidth = GetSystemMetrics(SM_CXHSCROLL);
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hThumb = GetSystemMetrics(SM_CXHTHUMB);
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vArrowHeight = GetSystemMetrics(SM_CYVSCROLL);
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vThumb = GetSystemMetrics(SM_CYVTHUMB);
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sprintf(tkDefScrollbarWidth, "%d", arrowWidth);
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkpComputeScrollbarGeometry --
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*
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* After changes in a scrollbar's size or configuration, this procedure
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* recomputes various geometry information used in displaying the
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* scrollbar.
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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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* The scrollbar will be displayed differently.
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*
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*----------------------------------------------------------------------
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*/
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void
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TkpComputeScrollbarGeometry(
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TkScrollbar *scrollPtr)
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/* Scrollbar whose geometry may have
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* changed. */
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{
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int fieldLength, minThumbSize;
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/*
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* Windows doesn't use focus rings on scrollbars, but we still perform
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* basic sanity checks to appease backwards compatibility.
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*/
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if (scrollPtr->highlightWidth < 0) {
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scrollPtr->highlightWidth = 0;
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}
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if (scrollPtr->vertical) {
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scrollPtr->arrowLength = vArrowHeight;
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fieldLength = Tk_Height(scrollPtr->tkwin);
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minThumbSize = vThumb;
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} else {
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scrollPtr->arrowLength = hArrowWidth;
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fieldLength = Tk_Width(scrollPtr->tkwin);
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minThumbSize = hThumb;
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}
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fieldLength -= 2*scrollPtr->arrowLength;
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if (fieldLength < 0) {
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fieldLength = 0;
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}
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scrollPtr->sliderFirst = (int) ((double)fieldLength
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* scrollPtr->firstFraction);
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scrollPtr->sliderLast = (int) ((double)fieldLength
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* scrollPtr->lastFraction);
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/*
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* Adjust the slider so that some piece of it is always displayed in the
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* scrollbar and so that it has at least a minimal width (so it can be
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* grabbed with the mouse).
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*/
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if (scrollPtr->sliderFirst > fieldLength) {
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scrollPtr->sliderFirst = fieldLength;
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}
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if (scrollPtr->sliderFirst < 0) {
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scrollPtr->sliderFirst = 0;
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}
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if (scrollPtr->sliderLast < (scrollPtr->sliderFirst
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+ minThumbSize)) {
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scrollPtr->sliderLast = scrollPtr->sliderFirst + minThumbSize;
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}
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if (scrollPtr->sliderLast > fieldLength) {
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scrollPtr->sliderLast = fieldLength;
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}
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scrollPtr->sliderFirst += scrollPtr->arrowLength;
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scrollPtr->sliderLast += scrollPtr->arrowLength;
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/*
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* Register the desired geometry for the window (leave enough space for
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* the two arrows plus a minimum-size slider, plus border around the whole
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* window, if any). Then arrange for the window to be redisplayed.
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*/
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if (scrollPtr->vertical) {
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Tk_GeometryRequest(scrollPtr->tkwin,
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scrollPtr->width, 2*scrollPtr->arrowLength + minThumbSize);
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} else {
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Tk_GeometryRequest(scrollPtr->tkwin,
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2*scrollPtr->arrowLength + minThumbSize, scrollPtr->width);
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}
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Tk_SetInternalBorder(scrollPtr->tkwin, 0);
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}
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/*
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*----------------------------------------------------------------------
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*
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* ScrollbarProc --
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*
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* This function is call by Windows whenever an event occurs on a
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* scrollbar control created by Tk.
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*
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* Results:
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* Standard Windows return value.
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*
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* Side effects:
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* May generate events.
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*
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*----------------------------------------------------------------------
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*/
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static LRESULT CALLBACK
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ScrollbarProc(
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HWND hwnd,
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UINT message,
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WPARAM wParam,
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LPARAM lParam)
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{
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LRESULT result;
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POINT point;
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WinScrollbar *scrollPtr;
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Tk_Window tkwin = Tk_HWNDToWindow(hwnd);
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if (tkwin == NULL) {
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Tcl_Panic("ScrollbarProc called on an invalid HWND");
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}
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scrollPtr = (WinScrollbar *)((TkWindow*)tkwin)->instanceData;
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switch(message) {
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case WM_HSCROLL:
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case WM_VSCROLL: {
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Tcl_Interp *interp;
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Tcl_DString cmdString;
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int command = LOWORD(wParam);
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int code;
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GetCursorPos(&point);
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Tk_TranslateWinEvent(NULL, WM_MOUSEMOVE, 0,
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MAKELPARAM(point.x, point.y), &result);
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if (command == SB_ENDSCROLL) {
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return 0;
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}
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/*
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* Bail out immediately if there isn't a command to invoke.
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*/
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if (scrollPtr->info.commandSize == 0) {
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Tcl_ServiceAll();
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return 0;
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}
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Tcl_DStringInit(&cmdString);
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Tcl_DStringAppend(&cmdString, scrollPtr->info.command,
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scrollPtr->info.commandSize);
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if (command == SB_LINELEFT || command == SB_LINERIGHT) {
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Tcl_DStringAppendElement(&cmdString, "scroll");
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Tcl_DStringAppendElement(&cmdString,
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(command == SB_LINELEFT ) ? "-1" : "1");
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Tcl_DStringAppendElement(&cmdString, "units");
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} else if (command == SB_PAGELEFT || command == SB_PAGERIGHT) {
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Tcl_DStringAppendElement(&cmdString, "scroll");
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Tcl_DStringAppendElement(&cmdString,
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(command == SB_PAGELEFT ) ? "-1" : "1");
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Tcl_DStringAppendElement(&cmdString, "pages");
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} else {
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char valueString[TCL_DOUBLE_SPACE];
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double pos = 0.0;
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switch (command) {
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case SB_THUMBPOSITION:
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pos = ((double)HIWORD(wParam)) / MAX_SCROLL;
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break;
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case SB_THUMBTRACK:
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pos = ((double)HIWORD(wParam)) / MAX_SCROLL;
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break;
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case SB_TOP:
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pos = 0.0;
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break;
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case SB_BOTTOM:
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pos = 1.0;
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break;
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}
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Tcl_PrintDouble(NULL, pos, valueString);
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Tcl_DStringAppendElement(&cmdString, "moveto");
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Tcl_DStringAppendElement(&cmdString, valueString);
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}
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interp = scrollPtr->info.interp;
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code = Tcl_EvalEx(interp, cmdString.string, -1, TCL_EVAL_GLOBAL);
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if (code != TCL_OK && code != TCL_CONTINUE && code != TCL_BREAK) {
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Tcl_AddErrorInfo(interp, "\n (scrollbar command)");
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Tcl_BackgroundException(interp, code);
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}
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Tcl_DStringFree(&cmdString);
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Tcl_ServiceAll();
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return 0;
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}
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default:
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if (Tk_TranslateWinEvent(hwnd, message, wParam, lParam, &result)) {
|
||
return result;
|
||
}
|
||
}
|
||
return CallWindowProcW(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(
|
||
TCL_UNUSED(TkScrollbar *))
|
||
/* Information about widget; may or may not
|
||
* already have values for some fields. */
|
||
{
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* ModalLoop --
|
||
*
|
||
* This function is invoked in response to a ButtonPress event.
|
||
* It resends the event to the Scrollbar window procedure,
|
||
* which in turn enters a modal loop.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
ModalLoop(
|
||
WinScrollbar *scrollPtr,
|
||
XEvent *eventPtr)
|
||
{
|
||
int oldMode;
|
||
|
||
if (scrollPtr->hwnd) {
|
||
Tcl_Preserve(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(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(
|
||
TkScrollbar *scrollPtr,
|
||
/* Scrollbar widget record. */
|
||
int x, int 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;
|
||
}
|
||
|
||
/*
|
||
* Local Variables:
|
||
* mode: c
|
||
* c-basic-offset: 4
|
||
* fill-column: 78
|
||
* End:
|
||
*/
|