coolscroll.c

功能强大的自制滚动条

		SetRect(&ctrl, rect->right - butwidth, rect->top, rect->right, rect->bottom);

		RotateRect0(sb, &ctrl);

		if(fCustomDraw)
			PostCustomDrawNotify(hwnd, hdc, sb->nBarType, &ctrl, SB_LINERIGHT, fMouseDownR, fMouseOverR, uRightButFlags & DFCS_INACTIVE);
		else
			DrawScrollArrow(sb, hdc, &ctrl, uRightButFlags, fMouseDownR, fMouseOverR);

		RotateRect0(sb, &ctrl);
	}
	//not enough room for the scrollbar, so just draw the buttons (scaled in size to fit)
	else
	{
		butwidth = scrollwidth / 2;

		//LEFT ARROW
		SetRect(&ctrl, rect->left, rect->top, rect->left + butwidth, rect->bottom);

		RotateRect0(sb, &ctrl);
		if(fCustomDraw)
			PostCustomDrawNotify(hwnd, hdc, sb->nBarType, &ctrl, SB_LINELEFT, fMouseDownL, fMouseOverL, uLeftButFlags & DFCS_INACTIVE);
		else	
			DrawScrollArrow(sb, hdc, &ctrl, uLeftButFlags, fMouseDownL, fMouseOverL);
		RotateRect0(sb, &ctrl);

		//RIGHT ARROW
		OffsetRect(&ctrl, scrollwidth - butwidth, 0);
		
		RotateRect0(sb, &ctrl);
		if(fCustomDraw)
			PostCustomDrawNotify(hwnd, hdc, sb->nBarType, &ctrl, SB_LINERIGHT, fMouseDownR, fMouseOverR, uRightButFlags & DFCS_INACTIVE);
		else
			DrawScrollArrow(sb, hdc, &ctrl, uRightButFlags, fMouseDownR, fMouseOverR);		
		RotateRect0(sb, &ctrl);

		//if there is a gap between the buttons, fill it with a solid color
		//if(butwidth & 0x0001)
		if(ctrl.left != rect->left + butwidth)
		{
			ctrl.left --;
			ctrl.right -= butwidth;
			RotateRect0(sb, &ctrl);
			
			if(fCustomDraw)
				PostCustomDrawNotify(hwnd, hdc, sb->nBarType, &ctrl, SB_PAGERIGHT, 0, 0, 0);
			else
				DrawCheckedRect(hdc, &ctrl, crCheck1, crCheck2);

			RotateRect0(sb, &ctrl);
		}
			
	}

#ifdef CUSTOM_DRAW
	PostCustomPrePostPaint(hwnd, hdc, sb, CDDS_POSTPAINT);
#endif

	return fCustomDraw;
}

//
//	Draw a vertical scrollbar using the horizontal draw routine, but
//	with the coordinates adjusted accordingly
//
static LRESULT NCDrawVScrollbar(SCROLLBAR *sb, HWND hwnd, HDC hdc, const RECT *rect, UINT uDrawFlags)
{
	LRESULT ret;
	RECT rc;

	rc = *rect;
	RotateRect(&rc);
	ret = NCDrawHScrollbar(sb, hwnd, hdc, &rc, uDrawFlags);
	RotateRect(&rc);
	
	return ret;
}

//
//	Generic wrapper function for the scrollbar drawing
//
static LRESULT NCDrawScrollbar(SCROLLBAR *sb, HWND hwnd, HDC hdc, const RECT *rect, UINT uDrawFlags)
{
	if(sb->nBarType == SB_HORZ)
		return NCDrawHScrollbar(sb, hwnd, hdc, rect, uDrawFlags);
	else
		return NCDrawVScrollbar(sb, hwnd, hdc, rect, uDrawFlags);
}

#ifdef INCLUDE_BUTTONS

//
//	Draw the specified bitmap centered in the rectangle
//
static void DrawImage(HDC hdc, HBITMAP hBitmap, RECT *rc)
{
	BITMAP bm;
	int cx;
	int cy;   
	HDC memdc;
	HBITMAP hOldBM;
	RECT  rcDest = *rc;   
	POINT p;
	SIZE  delta;
	COLORREF colorOld;

	if(hBitmap == NULL) 
		return;

	// center bitmap in caller's rectangle   
	GetObject(hBitmap, sizeof bm, &bm);   
	
	cx = bm.bmWidth;
	cy = bm.bmHeight;

	delta.cx = (rc->right-rc->left - cx) / 2;
	delta.cy = (rc->bottom-rc->top - cy) / 2;
	
	if(rc->right-rc->left > cx)
	{
		SetRect(&rcDest, rc->left+delta.cx, rc->top + delta.cy, 0, 0);   
		rcDest.right = rcDest.left + cx;
		rcDest.bottom = rcDest.top + cy;
		p.x = 0;
		p.y = 0;
	}
	else
	{
		p.x = -delta.cx;   
		p.y = -delta.cy;
	}
   
	// select checkmark into memory DC
	memdc = CreateCompatibleDC(hdc);
	hOldBM = (HBITMAP)SelectObject(memdc, hBitmap);
   
	// set BG color based on selected state   
	colorOld = SetBkColor(hdc, GetSysColor(COLOR_3DFACE));

	BitBlt(hdc, rcDest.left, rcDest.top, rcDest.right-rcDest.left, rcDest.bottom-rcDest.top, memdc, p.x, p.y, SRCCOPY);

	// restore
	SetBkColor(hdc, colorOld);
	SelectObject(memdc, hOldBM);
	DeleteDC(memdc);
}

//
// Draw the specified metafile
//
static void DrawMetaFile(HDC hdc, HENHMETAFILE hemf, RECT *rect)
{
	RECT rc;
	POINT pt;

	SetRect(&rc, 0, 0, rect->right-rect->left, rect->bottom-rect->top);
	SetWindowOrgEx(hdc, -rect->left, -rect->top, &pt);
	PlayEnhMetaFile(hdc, hemf, &rc);
	SetWindowOrgEx(hdc, pt.x, pt.y, 0);
}

//
//	Draw a single scrollbar inserted button, in whatever style
//	it has been defined to use.	
//
static UINT DrawScrollButton(SCROLLBUT *sbut, HDC hdc, const RECT *pctrl, UINT flags)
{
	NMCSBCUSTOMDRAW	nmcd;
	HWND hwnd;
	RECT rect = *pctrl;
	UINT f;

	switch(sbut->uButType & SBBT_MASK)
	{
	case SBBT_OWNERDRAW:

		hwnd = WindowFromDC(hdc);

		//fill in the standard header
		nmcd.hdr.hwndFrom = hwnd;
		nmcd.hdr.idFrom   = GetWindowLong(hwnd, GWL_ID);
		nmcd.hdr.code     = NM_COOLSB_CUSTOMDRAW;

		nmcd.dwDrawStage  = CDDS_ITEMPREPAINT;
		nmcd.nBar		  = SB_INSBUT;
		nmcd.rect		  = *pctrl;
		nmcd.uItem		  = sbut->uCmdId;
		nmcd.hdc		  = hdc;
		nmcd.uState		  = flags;

		IntersectClipRect(hdc, rect.left, rect.top, rect.right, rect.bottom);
		SendMessage(GetParent(hwnd), WM_NOTIFY, nmcd.hdr.idFrom, (LPARAM)&nmcd);
		SelectClipRgn(hdc, NULL);

		break;

	case SBBT_FIXED:
		flags &= ~SBBS_PUSHED;

	case SBBT_TOGGLEBUTTON:
		if(sbut->uState != SBBS_NORMAL)
			flags |= SBBS_PUSHED;

		//intentionally fall through here...

	case SBBT_PUSHBUTTON: 
		
		f = flags & SBBS_PUSHED ? DFCS_PUSHED | DFCS_FLAT : 0;
		if(sbut->uButType & SBBM_LEFTARROW)
		{
			DrawFrameControl(hdc, &rect, DFC_SCROLL, DFCS_SCROLLLEFT | f);
		}
		else if(sbut->uButType & SBBM_RIGHTARROW)
		{
			DrawFrameControl(hdc, &rect, DFC_SCROLL, DFCS_SCROLLRIGHT | f);
		}
		else if(sbut->uButType & SBBM_UPARROW)
		{
			DrawFrameControl(hdc, &rect, DFC_SCROLL, DFCS_SCROLLUP | f);
		}
		else if(sbut->uButType & SBBM_DOWNARROW)
		{
			DrawFrameControl(hdc, &rect, DFC_SCROLL, DFCS_SCROLLDOWN | f);
		}
		else
		{
			//
			if(flags & SBBS_PUSHED)
			{
				if(sbut->uButType & SBBM_RECESSED)
				{
					InflateRect(&rect, -1, -1);
					DrawEdge(hdc, &rect, EDGE_SUNKEN, BF_RECT|BF_FLAT);
					InflateRect(&rect, 1, 1);

					FrameRect(hdc, &rect, GetSysColorBrush(COLOR_3DDKSHADOW));
					InflateRect(&rect, -2, -2);
				}
				else
				{
					DrawEdge(hdc, &rect, EDGE_SUNKEN, BF_RECT | BF_FLAT | BF_ADJUST);
					InflateRect(&rect, 1, 1);
				}
			}
			else
			{
				// draw the button borders
				if(sbut->uButType & SBBM_TYPE2)
				{
					DrawFrameControl(hdc, &rect, DFC_BUTTON, DFCS_BUTTONPUSH);
					InflateRect(&rect, -2, -2);
				}

				else if(sbut->uButType & SBBM_TYPE3)
				{
					DrawFrameControl(hdc, &rect, DFC_BUTTON, DFCS_BUTTONPUSH);
					InflateRect(&rect, -1, -1);
				}
				else
				{
					DrawEdge(hdc, &rect, EDGE_RAISED, BF_RECT | BF_ADJUST);
					rect.bottom++;
					rect.right++;
				}
			
				OffsetRect(&rect, -1, -1);
				rect.top++;	rect.left++;
			}

			if(sbut->hBmp)
			{
				PaintRect(hdc, &rect, GetSysColor(COLOR_3DFACE));

				if(flags & SBBS_PUSHED)	
				{
					rect.top++; rect.left++;
				}

				IntersectClipRect(hdc, rect.left, rect.top, rect.right,rect.bottom);
				DrawImage(hdc, sbut->hBmp, &rect);
				SelectClipRgn(hdc, 0);
			}
			else if(sbut->hEmf)
			{
				PaintRect(hdc, &rect, GetSysColor(COLOR_3DFACE));
				InflateRect(&rect, -1, -1);		

				if(flags & SBBS_PUSHED)	
				{
					rect.top++; rect.left++;
				}

				IntersectClipRect(hdc, rect.left, rect.top, rect.right,rect.bottom);
				DrawMetaFile(hdc, sbut->hEmf, &rect);
				SelectClipRgn(hdc, 0);
			}
			else
			{
				PaintRect(hdc, &rect, GetSysColor(COLOR_3DFACE));
			}
		}
			

		break;

	case SBBT_BLANK:
		PaintRect(hdc, &rect, GetSysColor(COLOR_3DFACE));
		break;

	case SBBT_FLAT:
		DrawBlankButton(hdc, &rect, BF_FLAT);
		break;

	case SBBT_DARK:
		PaintRect(hdc, &rect, GetSysColor(COLOR_3DDKSHADOW));
		break;
	}
	
	return 0;
}

//
//	Draw any buttons inserted into the horizontal scrollbar
//	assume that the button widths have already been calculated
//	Note: RECT *rect is the rectangle of the scrollbar
//	      leftright: 1 = left, 2 = right, 3 = both
//
static LRESULT DrawHorzButtons(SCROLLBAR *sbar, HDC hdc, const RECT *rect, int leftright)
{
	int i;
	int xposl, xposr;
	RECT ctrl;
	SCROLLBUT *sbut = sbar->sbButtons;
	
	xposl = rect->left - sbar->nButSizeBefore;
	xposr = rect->right;
	
	for(i = 0; i < sbar->nButtons; i++)
	{
		if((leftright & SBBP_LEFT) && sbut[i].uPlacement == SBBP_LEFT)
		{
			int butwidth = GetSingleButSize(sbar, &sbut[i]);
			SetRect(&ctrl, xposl, rect->top, xposl + butwidth, rect->bottom);
			RotateRect0(sbar, &ctrl);
			DrawScrollButton(&sbut[i], hdc, &ctrl, SBBS_NORMAL);
			
			xposl += butwidth;
		}

		if((leftright & SBBP_RIGHT) && sbut[i].uPlacement == SBBP_RIGHT)
		{
			int butwidth = GetSingleButSize(sbar, &sbut[i]);
			SetRect(&ctrl, xposr, rect->top, xposr + butwidth, rect->bottom);
			RotateRect0(sbar, &ctrl);
			DrawScrollButton(&sbut[i], hdc, &ctrl, SBBS_NORMAL);
			xposr += butwidth;
		}
	}
	return 0;
}

static LRESULT DrawVertButtons(SCROLLBAR *sbar, HDC hdc, const RECT *rect, int leftright)
{
	RECT rc = *rect;
	RotateRect(&rc);
	DrawHorzButtons(sbar, hdc, &rc, leftright);
	return 0;
}
#endif	// INCLUDE_BUTTONS

//
//	Define these two for proper processing of NCPAINT
//	NOT needed if we don't bother to mask the scrollbars we draw
//	to prevent the old window procedure from accidently drawing over them
//
HDC CoolSB_GetDC(HWND hwnd, WPARAM wParam)
{
	// I just can't figure out GetDCEx, so I'll just use this:
	return GetWindowDC(hwnd);

	/*
	RECT rc;
	DWORD flags = 0x10000;
	HRGN hrgn = (HRGN)wParam;

	if(hrgn == (HRGN)1)
	{
		GetWindowRect(hwnd, &rc);
		OffsetRect(&rc, -rc.left, -rc.top);
		hrgn = CreateRectRgnIndirect(&rc);
	}

	if(GetWindowLong(hwnd, GWL_STYLE) & WS_CLIPCHILDREN)
		flags |= DCX_CLIPCHILDREN;

	if(GetWindowLong(hwnd, GWL_STYLE) & WS_CLIPSIBLINGS)
		flags |= DCX_CLIPSIBLINGS;

	return GetDCEx(hwnd, hrgn, flags | DCX_CACHE|DCX_NORESETATTRS|DCX_WINDOW | DCX_INTERSECTUPDATE);
	*/

	//return GetDCEx(hwnd, NULL, flags | DCX_WINDOW| DCX_NORESETATTRS);
}

static LRESULT NCPaint(SCROLLWND *sw, HWND hwnd, WPARAM wParam, LPARAM lParam)
{
	SCROLLBAR *sb;
	HDC hdc;
	HRGN hrgn;
	RECT winrect, rect;
	HRGN clip;
	BOOL fUpdateAll = ((LONG)wParam == 1);
	BOOL fCustomDraw = FALSE;
	UINT ret;
	DWORD dwStyle;

	GetWindowRect(hwnd, &winrect);
	
	//if entire region needs painting, then make a region to cover the entire window
	if(fUpdateAll)
		hrgn = (HRGN)wParam;
	else
		hrgn = (HRGN)wParam;
	
	//hdc = GetWindowDC(hwnd);
	hdc = CoolSB_GetDC(hwnd, wParam);

	//
	//	Only draw the horizontal scrollbar if the window is tall enough
	//
	sb = &sw->sbarHorz;
	if(sb->fScrollVisible)
	{
		int hbarwidth = 0, leftright = 0;

		//get the screen coordinates of the whole horizontal scrollbar area
		GetHScrollRect(sw, hwnd, &rect);

		//make the coordinates relative to the window for drawing
		OffsetRect(&rect, -winrect.left, -winrect.top);

#ifdef INCLUDE_BUTTONS

		//work out the size of any inserted buttons so we can dra them
		sb->nButSizeBefore  = GetButtonSize(sb, hwnd, SBBP_LEFT);
		sb->nButSizeAfter   = GetButtonSize(sb, hwnd, SBBP_RIGHT);

		//make sure there is room for the buttons
		hbarwidth = rect.right - rect.left;

		//check that we can fit any left/right buttons in the available space
		if(sb->nButSizeAfter < (hbarwidth - MIN_COOLSB_SIZE))
		{
			//adjust the scrollbar rectangle to fit the buttons into
			sb->fButVisibleAfter = TRUE;
			rect.right -= sb->nButSizeAfter;
			leftright |= SBBP_RIGHT;
			
			//check that there is enough space for the right buttons
			if(sb->nButSizeBefore + sb->nButSizeAfter < (hbarwidth - MIN_COOLSB_SIZE))
			{
				sb->fButVisibleBefore = TRUE;
				rect.left += sb->nButSizeBefore;
				leftright |= SBBP_LEFT;
			}
			else
				sb->fButVisibleBefore = FALSE;
		}	
		else
			sb->fButVisibleAfter = FALSE;
		
		
		DrawHorzButtons(sb, hdc, &rect, leftright);
#endif// INCLUDE_BUTTONS		

		if(uCurrentScrollbar == SB_HORZ)
			fCustomDraw |= NCDrawHScrollbar(sb, hwnd, hdc, &rect, uScrollTimerPortion);
		else
			fCustomDraw |= NCDrawHScrollbar(sb, hwnd, hdc, &rect, HTSCROLL_NONE);
	}

	//
	// Only draw the vertical scrollbar if the window is wide enough to accomodate it
	//
	sb = &sw->sbarVert;
	if(sb->fScrollVisible)
	{
		int vbarheight = 0, updown = 0;

		//get the screen cooridinates of the whole horizontal scrollbar area
		GetVScrollRect(sw, hwnd, &rect);

		//make the coordinates relative to the window for drawing
		OffsetRect(&rect, -winrect.left, -winrect.top);

#ifdef INCLUDE_BUTTONS

		//work out the size of any inserted buttons so we can dra them
		sb->nButSizeBefore  = GetButtonSize(sb, hwnd, SBBP_LEFT);
		sb->nButSizeAfter   = GetButtonSize(sb, hwnd, SBBP_RIGHT);