trackbar.c

winNT技术操作系统,国外开放的原代码和LIUX一样

/*
 * Trackbar control
 *
 * Copyright 1998, 1999 Eric Kohl
 * Copyright 1998, 1999 Alex Priem
 * Copyright 2002 Dimitrie O. Paun
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 * NOTE
 * 
 * This code was audited for completeness against the documented features
 * of Comctl32.dll version 6.0 on Sep. 12, 2002, by Dimitrie O. Paun.
 * 
 * Unless otherwise noted, we believe this code to be complete, as per
 * the specification mentioned above.
 * If you discover missing features, or bugs, please note them below.
 * 
 */

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winuser.h"
#include "winnls.h"
#include "commctrl.h"
#include "uxtheme.h"
#include "tmschema.h"
#include "wine/debug.h"

#include "comctl32.h"

WINE_DEFAULT_DEBUG_CHANNEL(trackbar);

typedef struct
{
    HWND hwndSelf;
    LONG lRangeMin;
    LONG lRangeMax;
    LONG lLineSize;
    LONG lPageSize;
    LONG lSelMin;
    LONG lSelMax;
    LONG lPos;
    UINT uThumbLen;
    UINT uNumTics;
    UINT uTicFreq;
    HWND hwndNotify;
    HWND hwndToolTip;
    HWND hwndBuddyLA;
    HWND hwndBuddyRB;
    INT  fLocation;
    INT  flags;
    BOOL bUnicode;
    BOOL bFocussed;
    RECT rcChannel;
    RECT rcSelection;
    RECT rcThumb;
    LPLONG tics;
} TRACKBAR_INFO;

#define TB_REFRESH_TIMER	1
#define TB_REFRESH_DELAY	500

#define TOOLTIP_OFFSET		2     /* distance from ctrl edge to tooltip */

/* Used by TRACKBAR_Refresh to find out which parts of the control
   need to be recalculated */

#define TB_THUMBPOSCHANGED      1
#define TB_THUMBSIZECHANGED     2
#define TB_THUMBCHANGED 	(TB_THUMBPOSCHANGED | TB_THUMBSIZECHANGED)
#define TB_SELECTIONCHANGED     4
#define TB_DRAG_MODE            8     /* we're dragging the slider */
#define TB_AUTO_PAGE_LEFT	16
#define TB_AUTO_PAGE_RIGHT	32
#define TB_AUTO_PAGE		(TB_AUTO_PAGE_LEFT | TB_AUTO_PAGE_RIGHT)
#define TB_THUMB_HOT            64    /* mouse hovers above thumb */

/* helper defines for TRACKBAR_DrawTic */
#define TIC_EDGE                0x20
#define TIC_SELECTIONMARKMAX    0x80
#define TIC_SELECTIONMARKMIN    0x100
#define TIC_SELECTIONMARK       (TIC_SELECTIONMARKMAX | TIC_SELECTIONMARKMIN)

static const WCHAR themeClass[] = { 'T','r','a','c','k','b','a','r',0 };

static inline int 
notify_customdraw(TRACKBAR_INFO *infoPtr, NMCUSTOMDRAW *pnmcd, int stage)
{
    pnmcd->dwDrawStage = stage;
    return SendMessageW (infoPtr->hwndNotify, WM_NOTIFY, 
		         pnmcd->hdr.idFrom, (LPARAM)pnmcd);
}

static LRESULT notify_hdr(TRACKBAR_INFO *infoPtr, INT code, LPNMHDR pnmh)
{
    LRESULT result;
    
    TRACE("(code=%d)\n", code);

    pnmh->hwndFrom = infoPtr->hwndSelf;
    pnmh->idFrom = GetWindowLongPtrW(infoPtr->hwndSelf, GWLP_ID);
    pnmh->code = code;
    result = SendMessageW(infoPtr->hwndNotify, WM_NOTIFY,
			  (WPARAM)pnmh->idFrom, (LPARAM)pnmh);

    TRACE("  <= %ld\n", result);

    return result;
}

static inline int notify(TRACKBAR_INFO *infoPtr, INT code)
{
    NMHDR nmh;
    return notify_hdr(infoPtr, code, &nmh);
}

static BOOL
notify_with_scroll (TRACKBAR_INFO *infoPtr, UINT code)
{
    BOOL bVert = GetWindowLongW (infoPtr->hwndSelf, GWL_STYLE) & TBS_VERT;

    TRACE("%x\n", code);

    return (BOOL) SendMessageW (infoPtr->hwndNotify,
                                bVert ? WM_VSCROLL : WM_HSCROLL,
				(WPARAM)code, (LPARAM)infoPtr->hwndSelf);
}
    
static void TRACKBAR_RecalculateTics (TRACKBAR_INFO *infoPtr)
{
    int i, tic, nrTics;

    if (infoPtr->uTicFreq && infoPtr->lRangeMax >= infoPtr->lRangeMin)
    	nrTics=(infoPtr->lRangeMax - infoPtr->lRangeMin)/infoPtr->uTicFreq;
    else {
        nrTics = 0;
        Free (infoPtr->tics);
        infoPtr->tics = NULL;
        infoPtr->uNumTics = 0;
        return;
    }

    if (nrTics != infoPtr->uNumTics) {
    	infoPtr->tics=ReAlloc (infoPtr->tics,
                                        (nrTics+1)*sizeof (DWORD));
	if (!infoPtr->tics) {
	    infoPtr->uNumTics = 0;
	    notify(infoPtr, NM_OUTOFMEMORY);
	    return;
	}
    	infoPtr->uNumTics = nrTics;
    }

    tic = infoPtr->lRangeMin + infoPtr->uTicFreq;
    for (i = 0; i < nrTics; i++, tic += infoPtr->uTicFreq)
        infoPtr->tics[i] = tic;
}

/* converts from physical (mouse) position to logical position
   (in range of trackbar) */

static inline LONG
TRACKBAR_ConvertPlaceToPosition (TRACKBAR_INFO *infoPtr, int place,
                                 int vertical)
{
    double range, width, pos, offsetthumb;

    range = infoPtr->lRangeMax - infoPtr->lRangeMin;
    if (vertical) {
        offsetthumb = (infoPtr->rcThumb.bottom - infoPtr->rcThumb.top)/2;
        width = infoPtr->rcChannel.bottom - infoPtr->rcChannel.top - (offsetthumb * 2) - 1;
        pos = (range*(place - infoPtr->rcChannel.top - offsetthumb)) / width;
    } else {
        offsetthumb = (infoPtr->rcThumb.right - infoPtr->rcThumb.left)/2;
        width = infoPtr->rcChannel.right - infoPtr->rcChannel.left - (offsetthumb * 2) - 1;
        pos = (range*(place - infoPtr->rcChannel.left - offsetthumb)) / width;
    }
    pos += infoPtr->lRangeMin;
    if (pos > infoPtr->lRangeMax)
        pos = infoPtr->lRangeMax;
    else if (pos < infoPtr->lRangeMin)
        pos = infoPtr->lRangeMin;

    TRACE("%.2f\n", pos);
    return (LONG)(pos + 0.5);
}


/* return: 0> prev, 0 none, >0 next */
static LONG
TRACKBAR_GetAutoPageDirection (TRACKBAR_INFO *infoPtr, POINT clickPoint)
{
    DWORD dwStyle = GetWindowLongW (infoPtr->hwndSelf, GWL_STYLE);
    RECT pageRect;

    if (dwStyle & TBS_VERT) {
	pageRect.top = infoPtr->rcChannel.top;
	pageRect.bottom = infoPtr->rcChannel.bottom;
	pageRect.left = infoPtr->rcThumb.left;
	pageRect.right = infoPtr->rcThumb.right;
    } else {
	pageRect.top = infoPtr->rcThumb.top;
	pageRect.bottom = infoPtr->rcThumb.bottom;
	pageRect.left = infoPtr->rcChannel.left;
	pageRect.right = infoPtr->rcChannel.right;
    }


    if (PtInRect(&pageRect, clickPoint))
    {
	int clickPlace = (dwStyle & TBS_VERT) ? clickPoint.y : clickPoint.x;

        LONG clickPos = TRACKBAR_ConvertPlaceToPosition(infoPtr, clickPlace,
                                                        dwStyle & TBS_VERT);
	return clickPos - infoPtr->lPos;
    }

    return 0;
}

inline static void
TRACKBAR_PageDown (TRACKBAR_INFO *infoPtr)
{
    if (infoPtr->lPos == infoPtr->lRangeMax) return;

    infoPtr->lPos += infoPtr->lPageSize;
    if (infoPtr->lPos > infoPtr->lRangeMax)
	infoPtr->lPos = infoPtr->lRangeMax;
    notify_with_scroll (infoPtr, TB_PAGEDOWN);
}


inline static void
TRACKBAR_PageUp (TRACKBAR_INFO *infoPtr)
{
    if (infoPtr->lPos == infoPtr->lRangeMin) return;

    infoPtr->lPos -= infoPtr->lPageSize;
    if (infoPtr->lPos < infoPtr->lRangeMin)
        infoPtr->lPos = infoPtr->lRangeMin;
    notify_with_scroll (infoPtr, TB_PAGEUP);
}

inline static void TRACKBAR_LineUp(TRACKBAR_INFO *infoPtr)
{
    if (infoPtr->lPos == infoPtr->lRangeMin) return;
    infoPtr->lPos -= infoPtr->lLineSize;
    if (infoPtr->lPos < infoPtr->lRangeMin)
        infoPtr->lPos = infoPtr->lRangeMin;
    notify_with_scroll (infoPtr, TB_LINEUP);
}

inline static void TRACKBAR_LineDown(TRACKBAR_INFO *infoPtr)
{
    if (infoPtr->lPos == infoPtr->lRangeMax) return;
    infoPtr->lPos += infoPtr->lLineSize;
    if (infoPtr->lPos > infoPtr->lRangeMax)
        infoPtr->lPos = infoPtr->lRangeMax;
    notify_with_scroll (infoPtr, TB_LINEDOWN);
}

static void
TRACKBAR_CalcChannel (TRACKBAR_INFO *infoPtr)
{
    DWORD dwStyle = GetWindowLongW (infoPtr->hwndSelf, GWL_STYLE);
    INT cyChannel, offsetthumb, offsetedge;
    RECT lpRect, *channel = & infoPtr->rcChannel;

    GetClientRect (infoPtr->hwndSelf, &lpRect);

    offsetthumb = infoPtr->uThumbLen / 4;
    offsetedge  = offsetthumb + 3;
    cyChannel   = (dwStyle & TBS_ENABLESELRANGE) ? offsetthumb*3 : 4;
    if (dwStyle & TBS_VERT) {
        channel->top    = lpRect.top + offsetedge;
        channel->bottom = lpRect.bottom - offsetedge;
        if (dwStyle & TBS_ENABLESELRANGE)
            channel->left = lpRect.left + ((infoPtr->uThumbLen - cyChannel + 2) / 2);
        else
            channel->left = lpRect.left + (infoPtr->uThumbLen / 2) - 1;
        if (dwStyle & TBS_BOTH) {
            if (dwStyle & TBS_NOTICKS)
                channel->left += 1;
            else
                channel->left += 9;
        }
        else if (dwStyle & TBS_TOP) {
            if (dwStyle & TBS_NOTICKS)
                channel->left += 2;
            else
                channel->left += 10;
        }
        channel->right = channel->left + cyChannel;
    } else {
        channel->left = lpRect.left + offsetedge;
        channel->right = lpRect.right - offsetedge;
        if (dwStyle & TBS_ENABLESELRANGE)
            channel->top = lpRect.top + ((infoPtr->uThumbLen - cyChannel + 2) / 2);
        else
            channel->top = lpRect.top + (infoPtr->uThumbLen / 2) - 1;
        if (dwStyle & TBS_BOTH) {
            if (dwStyle & TBS_NOTICKS)
                channel->top += 1;
            else
                channel->top += 9;
        }
        else if (dwStyle & TBS_TOP) {
            if (dwStyle & TBS_NOTICKS)
                channel->top += 2;
            else
                channel->top += 10;
        }
        channel->bottom   = channel->top + cyChannel;
    }
}

static void
TRACKBAR_CalcThumb (TRACKBAR_INFO *infoPtr, LONG lPos, RECT *thumb)
{
    int range, width, height, thumbwidth;
    DWORD dwStyle = GetWindowLongW (infoPtr->hwndSelf, GWL_STYLE);
    RECT lpRect;

    range = infoPtr->lRangeMax - infoPtr->lRangeMin;
    thumbwidth = (infoPtr->uThumbLen / 2) | 1;

    if (!range) range = 1;

    GetClientRect(infoPtr->hwndSelf, &lpRect);
    if (dwStyle & TBS_VERT)
    {
    	height = infoPtr->rcChannel.bottom - infoPtr->rcChannel.top - thumbwidth;

        if ((dwStyle & (TBS_BOTH | TBS_LEFT)) && !(dwStyle & TBS_NOTICKS))
            thumb->left = 10;
        else
            thumb->left = 2;
        thumb->right = thumb->left + infoPtr->uThumbLen;
        thumb->top = infoPtr->rcChannel.top +
                     (height*(lPos - infoPtr->lRangeMin))/range;
        thumb->bottom = thumb->top + thumbwidth;
    }
    else
    {
    	width = infoPtr->rcChannel.right - infoPtr->rcChannel.left - thumbwidth;

        thumb->left = infoPtr->rcChannel.left +
                      (width*(lPos - infoPtr->lRangeMin))/range;
        thumb->right = thumb->left + thumbwidth;
        if ((dwStyle & (TBS_BOTH | TBS_TOP)) && !(dwStyle & TBS_NOTICKS))
            thumb->top = 10;
        else
            thumb->top = 2;
        thumb->bottom = thumb->top + infoPtr->uThumbLen;
    }
}

inline static void
TRACKBAR_UpdateThumb (TRACKBAR_INFO *infoPtr)
{
    TRACKBAR_CalcThumb(infoPtr, infoPtr->lPos, &infoPtr->rcThumb);
}

static inline void
TRACKBAR_InvalidateAll(TRACKBAR_INFO * infoPtr)
{
    InvalidateRect(infoPtr->hwndSelf, NULL, FALSE);
}

static void
TRACKBAR_InvalidateThumb (TRACKBAR_INFO *infoPtr, LONG thumbPos)
{
    RECT rcThumb;

    TRACKBAR_CalcThumb(infoPtr, thumbPos, &rcThumb);
    InflateRect(&rcThumb, 1, 1);
    InvalidateRect(infoPtr->hwndSelf, &rcThumb, FALSE);
}

static inline void
TRACKBAR_InvalidateThumbMove (TRACKBAR_INFO *infoPtr, LONG oldPos, LONG newPos)
{
    TRACKBAR_InvalidateThumb (infoPtr, oldPos);
    if (newPos != oldPos)
        TRACKBAR_InvalidateThumb (infoPtr, newPos);
}

inline static BOOL
TRACKBAR_HasSelection (TRACKBAR_INFO *infoPtr)
{
    return infoPtr->lSelMin != infoPtr->lSelMax;
}

static void
TRACKBAR_CalcSelection (TRACKBAR_INFO *infoPtr)
{
    RECT *selection = &infoPtr->rcSelection;
    int range = infoPtr->lRangeMax - infoPtr->lRangeMin;
    int offsetthumb, height, width;

    if (range <= 0) {
        SetRectEmpty (selection);
    } else {
        if (GetWindowLongW (infoPtr->hwndSelf, GWL_STYLE) & TBS_VERT) {
            offsetthumb = (infoPtr->rcThumb.bottom - infoPtr->rcThumb.top)/2;
            height = infoPtr->rcChannel.bottom - infoPtr->rcChannel.top - offsetthumb*2;
            selection->top    = infoPtr->rcChannel.top + offsetthumb +
                (height*infoPtr->lSelMin)/range;
            selection->bottom = infoPtr->rcChannel.top + offsetthumb +
                (height*infoPtr->lSelMax)/range;
            selection->left   = infoPtr->rcChannel.left + 3;
            selection->right  = infoPtr->rcChannel.right - 3;
        } else {
            offsetthumb = (infoPtr->rcThumb.right - infoPtr->rcThumb.left)/2;
            width = infoPtr->rcChannel.right - infoPtr->rcChannel.left - offsetthumb*2;
            selection->left   = infoPtr->rcChannel.left + offsetthumb +
                (width*infoPtr->lSelMin)/range;
            selection->right  = infoPtr->rcChannel.left + offsetthumb +
                (width*infoPtr->lSelMax)/range;
            selection->top    = infoPtr->rcChannel.top + 3;
            selection->bottom = infoPtr->rcChannel.bottom - 3;
        }
    }

    TRACE("selection[left=%d, top=%d, right=%d, bottom=%d]\n",
	   selection->left, selection->top, selection->right, selection->bottom);
}

static BOOL
TRACKBAR_AutoPage (TRACKBAR_INFO *infoPtr, POINT clickPoint)
{
    LONG dir = TRACKBAR_GetAutoPageDirection(infoPtr, clickPoint);
    LONG prevPos = infoPtr->lPos;

    TRACE("x=%d, y=%d, dir=%d\n", clickPoint.x, clickPoint.y, dir);

    if (dir > 0 && (infoPtr->flags & TB_AUTO_PAGE_RIGHT))
	TRACKBAR_PageDown(infoPtr);
    else if (dir < 0 && (infoPtr->flags & TB_AUTO_PAGE_LEFT))
	TRACKBAR_PageUp(infoPtr);
    else return FALSE;

    infoPtr->flags |= TB_THUMBPOSCHANGED;
    TRACKBAR_InvalidateThumbMove (infoPtr, prevPos, infoPtr->lPos);

    return TRUE;
}

/* Trackbar drawing code. I like my spaghetti done milanese.  */

static void
TRACKBAR_DrawChannel (TRACKBAR_INFO *infoPtr, HDC hdc, DWORD dwStyle)
{
    RECT rcChannel = infoPtr->rcChannel;
    HTHEME theme = GetWindowTheme (infoPtr->hwndSelf);

    if (theme)
    {
        DrawThemeBackground (theme, hdc, 
            (GetWindowLongW (infoPtr->hwndSelf, GWL_STYLE) & TBS_VERT) ? 
                TKP_TRACKVERT : TKP_TRACK, TKS_NORMAL, &rcChannel, 0);
    }
    else
    {