trackbar.c

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/*
** $Id: trackbar.c,v 1.33 2004/09/22 06:02:26 weiym Exp $
**
** trackbar.c: the TrackBar Control module.
**
** Copyright (C) 2003, 2004 Feynman Software.
** Copyright (C) 2000 ~ 2002 Wei Yongming.
**
** NOTE: Originally by Zheng Yiran
**
** Create date: 2000/12/02
*/

/*
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/*
** TODO:
*/

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

#include "common.h"
#include "minigui.h"
#include "gdi.h"
#include "window.h"
#include "control.h"
#include "cliprect.h"
#include "internals.h"
#include "ctrlclass.h"

#ifdef _CTRL_TRACKBAR

#include "ctrlmisc.h"
#include "trackbar.h"

#ifdef _PHONE_WINDOW_STYLE

static const BITMAP *bmp_hbg, *bmp_hslider;
static const BITMAP *bmp_vbg, *bmp_vslider;

#define WIDTH_HORZ_SLIDER       (bmp_hslider->bmWidth)
#define HEIGHT_VERT_SLIDER      (bmp_vslider->bmHeight)

#else   /* not _PHONE_WINDOW_STYLE */

/* use these definition when drawing trackbar */
#define TB_BORDER               2

#define WIDTH_HORZ_SLIDER       24
#define HEIGHT_HORZ_SLIDER      12

#define WIDTH_VERT_SLIDER       12
#define HEIGHT_VERT_SLIDER      24

#define WIDTH_VERT_RULER        6
#define HEIGHT_HORZ_RULER       6

/* please keep it even for good appearance */
#define LEN_TICK                4
#define GAP_TIP_SLIDER          12
#define GAP_TICK_SLIDER         6

#endif  /* not _PHONE_WINDOW_STYLE */

static int TrackBarCtrlProc (HWND hwnd, int message, WPARAM wParam, LPARAM lParam);

BOOL RegisterTrackBarControl (void)
{
    WNDCLASS WndClass;

#ifdef _PHONE_WINDOW_STYLE
    if ((bmp_hbg = GetStockBitmap (STOCKBMP_TRACKBAR_HBG, 0, 0)) == NULL)
        return FALSE;

    if ((bmp_hslider = GetStockBitmap (STOCKBMP_TRACKBAR_HSLIDER, 0, 0)) == NULL)
        return FALSE;

    if ((bmp_vbg = GetStockBitmap (STOCKBMP_TRACKBAR_VBG, 0, 0)) == NULL)
        return FALSE;

    if ((bmp_vslider = GetStockBitmap (STOCKBMP_TRACKBAR_VSLIDER, 0, 0)) == NULL)
        return FALSE;
#endif

    WndClass.spClassName = "trackbar";
    WndClass.dwStyle     = WS_NONE;
    WndClass.dwExStyle   = WS_EX_NONE;
    WndClass.hCursor     = GetSystemCursor (0);
    WndClass.iBkColor    = GetWindowElementColor (BKC_CONTROL_DEF);
    WndClass.WinProc     = TrackBarCtrlProc;

    return AddNewControlClass (&WndClass) == ERR_OK;
}

#if 0
void TrackBarControlCleanup (void)
{
    return;
}
#endif

#ifdef _PHONE_WINDOW_STYLE

static void GetTrackbarRects (TRACKBARDATA* pData, DWORD dwStyle, const RECT* rc_client, RECT* rc_ruler, RECT* rc_slider)
{
    int     l, t, w, h;
    int     pos, min, max;
    int     sliderx, slidery, sliderw, sliderh;

    /* get data of trackbar. */
    w = RECTWP (rc_client);
    h = RECTHP (rc_client);
    pos = pData->nPos;
    max = pData->nMax;
    min = pData->nMin;

    /* get width/height of slider. */
    if (dwStyle & TBS_VERTICAL) {
        sliderw = bmp_vslider->bmWidth;
        sliderh = bmp_vslider->bmHeight;
        h -= sliderh;
        l = 0; t = sliderh>>1;
    }
    else {
        sliderw = bmp_hslider->bmWidth;
        sliderh = bmp_hslider->bmHeight;
        w -= sliderw;
        l = sliderw>>1; t = 0;
    }

    /* get the rectangle of the ruler. */
    if (rc_ruler) {
        SetRect (rc_ruler, l, t, l + w, t + h);
    }
    
    /* get the rectangle of the slider according to position. */
    if (dwStyle & TBS_VERTICAL) {

        sliderx = (w - sliderw)>>1; 
        slidery = t + (int)((max - pos) * h / (float)(max - min)) - (sliderh>>1);
    }
    else {
        slidery = (h - sliderh)>>1; 
        sliderx = l + (int)((pos - min) * w / (float)(max - min)) - (sliderw>>1);
    }

    SetRect (rc_slider, sliderx, slidery, sliderx + sliderw, slidery + sliderh);
}

static void TrackBarOnDraw (HWND hwnd, HDC hdc, TRACKBARDATA* pData, DWORD dwStyle)
{
    RECT rc_client, rc_ruler, rc_slider;

    GetClientRect (hwnd, &rc_client);

    GetTrackbarRects (pData, dwStyle, &rc_client, &rc_ruler, &rc_slider);

    /* draw the ruler. */
    if (dwStyle & TBS_VERTICAL)
        DrawBoxFromBitmap (hdc, &rc_ruler, bmp_vbg, FALSE, FALSE);
    else
        DrawBoxFromBitmap (hdc, &rc_ruler, bmp_hbg, TRUE, FALSE);
    
    /* draw the slider. */
    FillBoxWithBitmap (hdc, rc_slider.left, rc_slider.top, 0, 0, 
            (dwStyle & TBS_VERTICAL) ? bmp_vslider : bmp_hslider);
}

#else /* not _PHONE_WINDOW_STYLE */

static void GetTrackbarRects (TRACKBARDATA* pData, DWORD dwStyle, const RECT* rc_client, RECT* rc_ruler, RECT* rc_slider)
{
    int x, y, w, h;
    int pos, min, max;
    int sliderx, slidery, sliderw, sliderh;

    /* get data of trackbar. */
    x = rc_client->left;
    y = rc_client->top;
    w = RECTWP (rc_client);
    h = RECTHP (rc_client);
    pos = pData->nPos;
    max = pData->nMax;
    min = pData->nMin;

    if (dwStyle & TBS_BORDER) {
        x += TB_BORDER;
        y += TB_BORDER;
        w -= TB_BORDER << 1;
        h -= TB_BORDER << 1;
    }

    /* get the rectangle of the ruler. */
    if (rc_ruler) {
        if (dwStyle & TBS_VERTICAL) {
            rc_ruler->left = x + ((w - WIDTH_VERT_RULER)>>1);
            rc_ruler->top = y + (HEIGHT_VERT_SLIDER >> 1);
            rc_ruler->right = x + ((w + WIDTH_VERT_RULER)>>1);
            rc_ruler->bottom = y + h - (HEIGHT_VERT_SLIDER >> 1);
        }
        else {
            rc_ruler->left = x + (WIDTH_HORZ_SLIDER >> 1);
            rc_ruler->top = y + ((h - HEIGHT_HORZ_RULER)>>1);
            rc_ruler->right = x + w - (WIDTH_HORZ_SLIDER >> 1);
            rc_ruler->bottom = y + ((h + HEIGHT_HORZ_RULER)>>1);
        }
    }

    /* get width/height of the slider. */
    if (dwStyle & TBS_VERTICAL) {
        sliderw = WIDTH_VERT_SLIDER;
        sliderh = HEIGHT_VERT_SLIDER;
    }
    else {
        sliderw = WIDTH_HORZ_SLIDER;
        sliderh = HEIGHT_HORZ_SLIDER;
    }

    if (dwStyle & TBS_VERTICAL) {
        sliderx = x + ((w - sliderw) >> 1); 
        slidery = y + (HEIGHT_VERT_SLIDER>>1)+ (int)((max - pos) * 
                (h - HEIGHT_VERT_SLIDER) / (float)(max - min)) - (sliderh>>1);
    }
    else {
        slidery = y + ((h - sliderh) >> 1); 
        sliderx = x + (WIDTH_HORZ_SLIDER >> 1) + (int)((pos - min) * 
                (w - WIDTH_HORZ_SLIDER) / (float)(max - min)) - (sliderw>>1);
    }

    SetRect (rc_slider, sliderx, slidery, sliderx + sliderw, slidery + sliderh);
}

static void TrackBarOnDraw (HWND hwnd, HDC hdc, TRACKBARDATA* pData, DWORD dwStyle)
{
    RECT    rc_client, rc_ruler, rc_slider;
    int     x, y, w, h;
    int     max, min;
    int     TickFreq, EndTipLen;
    int     sliderx, slidery, sliderw, sliderh;
    int     TickStart, TickEnd;
    float   TickGap, Tick;
    char    sPos[10];

    GetClientRect (hwnd, &rc_client);
    GetTrackbarRects (pData, dwStyle, &rc_client, &rc_ruler, &rc_slider);

    x = rc_client.left;
    y = rc_client.top;
    w = RECTW (rc_client);
    h = RECTH (rc_client);
    if (dwStyle & TBS_BORDER) {
        x += TB_BORDER;
        y += TB_BORDER;
        w -= TB_BORDER << 1;
        h -= TB_BORDER << 1;
    }

    /* get data of trackbar. */
    TickFreq = pData->nTickFreq;

    /* draw the border according to trackbar style. */
#ifdef _FLAT_WINDOW_STYLE
    if (dwStyle & TBS_BORDER) {
        DrawFlatControlFrameEx (hdc,  hwnd,
            rc_client.left, rc_client.top,
            rc_client.right, rc_client.bottom,
            0, DF_3DBOX_PRESSED | DF_3DBOX_NOTFILL, 0);
    }
#else
    if (dwStyle & TBS_BORDER) {
        Draw3DControlFrameEx (hdc, hwnd,
            rc_client.left, rc_client.top,
            rc_client.right, rc_client.bottom,
            DF_3DBOX_PRESSED | DF_3DBOX_NOTFILL, 0);
    }
#endif

    /* draw the rulder in middle of trackbar. */
#ifdef _FLAT_WINDOW_STYLE
    DrawFlatControlFrameEx (hdc, hwnd,
            rc_ruler.left, rc_ruler.top,
            rc_ruler.right - 1, rc_ruler.bottom - 1,
            0, DF_3DBOX_PRESSED | DF_3DBOX_NOTFILL, 0);    
    
#else
    Draw3DControlFrameEx (hdc, hwnd,
            rc_ruler.left, rc_ruler.top,
            rc_ruler.right - 1, rc_ruler.bottom - 1,
            DF_3DBOX_PRESSED | DF_3DBOX_NOTFILL, 0); 
#endif
    
    max = pData->nMax;
    min = pData->nMin;
    sliderx = rc_slider.left;
    slidery = rc_slider.top;
    sliderw = RECTW(rc_slider);
    sliderh = RECTH(rc_slider);

    /* draw the tick of trackbar. */
    if (!(dwStyle & TBS_NOTICK) && TickFreq < (max - min)) {
        SetPenColor (hdc, PIXEL_black);
        if (dwStyle & TBS_VERTICAL) {
            TickStart = y + (HEIGHT_VERT_SLIDER >> 1); 
            TickGap = (h - HEIGHT_VERT_SLIDER) / (float)(max - min) * TickFreq;
            TickEnd = y + h - (HEIGHT_VERT_SLIDER >> 1);
            for (Tick = TickStart; Tick < TickEnd; Tick += TickGap) { 
                MoveTo (hdc, x + (w>>1) + (sliderw>>1) + GAP_TICK_SLIDER, (int) Tick);
                LineTo (hdc, x + (w>>1) + (sliderw>>1) + GAP_TICK_SLIDER + LEN_TICK, (int) Tick);
            }
            MoveTo (hdc, x + (w>>1) + (sliderw>>1) + GAP_TICK_SLIDER, TickEnd);
            LineTo (hdc, x + (w>>1) + (sliderw>>1) + GAP_TICK_SLIDER + LEN_TICK, TickEnd);
        } else {
            TickStart = x + (WIDTH_HORZ_SLIDER >> 1); 
            TickGap = (w - WIDTH_HORZ_SLIDER) / (float)(max - min) * TickFreq;
            TickEnd = x + w - (WIDTH_HORZ_SLIDER >> 1);
            for (Tick = TickStart; Tick < TickEnd; Tick += TickGap) { 
                MoveTo (hdc, (int)Tick, y + (h>>1) + (sliderh>>1) + GAP_TICK_SLIDER);
                LineTo (hdc, (int)Tick, y + (h>>1) + (sliderh>>1) + GAP_TICK_SLIDER + LEN_TICK);
            }
            MoveTo (hdc, TickEnd, y + (h>>1) + (sliderh>>1) + GAP_TICK_SLIDER);
            LineTo (hdc, TickEnd, y + (h>>1) + (sliderh>>1) + GAP_TICK_SLIDER + LEN_TICK);
        }
    }

    /* draw the slider of trackbar according to pos. */
#ifdef _FLAT_WINDOW_STYLE
    DrawFlatControlFrameEx (hdc, hwnd,
            rc_slider.left, rc_slider.top,
            rc_slider.right - 1, rc_slider.bottom - 1, 0, 
            DF_3DBOX_NORMAL | DF_3DBOX_FILL, GetWindowBkColor (hwnd));
#else
    Draw3DControlFrameEx (hdc, hwnd,
            rc_slider.left, rc_slider.top,
            rc_slider.right - 1, rc_slider.bottom - 1,
            DF_3DBOX_NORMAL | DF_3DBOX_FILL, GetWindowBkColor (hwnd));
#endif

    SetPenColor (hdc, GetWindowElementColorEx (hwnd, FGC_CONTROL_NORMAL));
    if (dwStyle & TBS_VERTICAL) {
        MoveTo (hdc, sliderx + (sliderw >> 1) - 3, slidery + (sliderh >> 1));
        LineTo (hdc, sliderx + (sliderw >> 1) + 3, slidery + (sliderh >> 1));
        MoveTo (hdc, sliderx + (sliderw >> 1) - 2, slidery + (sliderh >> 1) - 2);
        LineTo (hdc, sliderx + (sliderw >> 1) + 2, slidery + (sliderh >> 1) - 2);
        MoveTo (hdc, sliderx + (sliderw >> 1) - 2, slidery + (sliderh >> 1) + 2);
        LineTo (hdc, sliderx + (sliderw >> 1) + 2, slidery + (sliderh >> 1) + 2);
    }
    else {
        MoveTo (hdc, sliderx + (sliderw >> 1), slidery + (sliderh >> 1) - 3);
        LineTo (hdc, sliderx + (sliderw >> 1), slidery + (sliderh >> 1) + 3);
        MoveTo (hdc, sliderx + (sliderw >> 1) - 2, slidery + (sliderh >> 1) - 2);
        LineTo (hdc, sliderx + (sliderw >> 1) - 2, slidery + (sliderh >> 1) + 2);
        MoveTo (hdc, sliderx + (sliderw >> 1) + 2, slidery + (sliderh >> 1) - 2);
        LineTo (hdc, sliderx + (sliderw >> 1) + 2, slidery + (sliderh >> 1) + 2);
    }

    /* draw the tip of trackbar. */
    if ((dwStyle & TBS_TIP) && !(dwStyle & TBS_VERTICAL)) {