PAGEWIN.CPP
/*
* PAGEWIN.CPP
* Patron Chapter 21
*
* Window procedure for the Pages window and support functions.
* This window manages its own scrollbars and viewport and provides
* printing capabilities as well.
*
* Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
*
* Kraig Brockschmidt, Microsoft
* Internet : kraigb@microsoft.com
* Compuserve: >INTERNET:kraigb@microsoft.com
*/
#include "patron.h"
/*
* PagesWndProc
*
* Purpose:
* Window procedure for the Pages window.
*/
LRESULT APIENTRY PagesWndProc(HWND hWnd, UINT iMsg, WPARAM wParam
, LPARAM lParam)
{
PCPages ppg;
PAINTSTRUCT ps;
HDC hDC;
int iPos, iTmp;
int iMin, iMax;
UINT idScroll;
BOOL fDirty=FALSE;
ppg=(PCPages)GetWindowLong(hWnd, PAGEWL_STRUCTURE);
switch (iMsg)
{
case WM_CREATE:
ppg=(PCPages)((LPCREATESTRUCT)lParam)->lpCreateParams;
SetWindowLong(hWnd, PAGEWL_STRUCTURE, (LONG)ppg);
ppg->m_hWnd=hWnd;
break;
case WM_PAINT:
/*
* If there is currently a drag-rectangle showing, then
* remove it before painting. This insures that
* painting doesn't blast part of that rectangle away so
* that when we draw it next, garbage is left around.
*/
if (ppg->m_fDragRectShown)
ppg->DrawDropTargetRect(NULL, NULL);
hDC=BeginPaint(hWnd, &ps);
//Draw only if we have a page to show.
if (0!=ppg->m_cPages)
ppg->Draw(hDC, FALSE, FALSE);
EndPaint(hWnd, &ps);
//Turn the rectangle back on, if necessary.
if (ppg->m_fDragRectShown)
ppg->DrawDropTargetRect(NULL, NULL);
break;
case WM_HSCROLL:
case WM_VSCROLL:
idScroll=(WM_HSCROLL==iMsg) ? SB_HORZ : SB_VERT;
iPos=GetScrollPos(hWnd, idScroll);
iTmp=iPos;
GetScrollRange(hWnd, idScroll, &iMin, &iMax);
switch (LOWORD(wParam))
{
case SB_LINEUP: iPos -= 20; break;
case SB_PAGEUP: iPos -=100; break;
case SB_LINEDOWN: iPos += 20; break;
case SB_PAGEDOWN: iPos +=100; break;
case SB_THUMBPOSITION:
iPos=ScrollThumbPosition(wParam, lParam);
break;
//We don't want scrolling on this message.
case SB_THUMBTRACK:
return 0L;
}
iPos=max(iMin, min(iPos, iMax));
if (iPos!=iTmp)
{
//Set the new position and scroll the window
SetScrollPos(hWnd, idScroll, iPos, TRUE);
if (SB_HORZ==idScroll)
{
ppg->m_xPos=iPos;
ScrollWindow(hWnd, iTmp-iPos, 0, NULL, NULL);
}
else
{
ppg->m_yPos=iPos;
ScrollWindow(hWnd, 0, iTmp-iPos, NULL, NULL);
}
}
break;
case WM_RBUTTONDOWN:
if (NULL==ppg->m_pPageCur)
break;
fDirty=ppg->m_pPageCur->OnRightDown(wParam
, LOWORD(lParam), HIWORD(lParam));
break;
case WM_LBUTTONDOWN:
if (NULL==ppg->m_pPageCur)
break;
fDirty=ppg->m_pPageCur->OnLeftDown(wParam
, LOWORD(lParam), HIWORD(lParam));
break;
case WM_LBUTTONUP:
if (NULL==ppg->m_pPageCur)
break;
fDirty=ppg->m_pPageCur->OnLeftUp(wParam
, LOWORD(lParam), HIWORD(lParam));
break;
case WM_LBUTTONDBLCLK:
if (NULL==ppg->m_pPageCur)
break;
fDirty=ppg->m_pPageCur->OnLeftDoubleClick(wParam, LOWORD(lParam)
, HIWORD(lParam));
break;
case WM_MOUSEMOVE:
if (NULL==ppg->m_pPageCur)
break;
ppg->m_pPageCur->OnMouseMove(wParam, LOWORD(lParam)
, HIWORD(lParam));
break;
case WM_TIMER:
if (NULL==ppg->m_pPageCur)
break;
ppg->m_pPageCur->OnTimer(wParam);
break;
case WM_NCHITTEST:
if (NULL!=ppg->m_pPageCur)
{
/*
* This just saves information in the page for
* OnSetCursor
*/
ppg->m_pPageCur->OnNCHitTest(LOWORD(lParam)
, HIWORD(lParam));
}
return DefWindowProc(hWnd, iMsg, wParam, lParam);
case WM_SETCURSOR:
if (NULL!=ppg->m_pPageCur)
{
if (ppg->m_pPageCur->OnSetCursor(LOWORD(lParam)))
break;
}
return DefWindowProc(hWnd, iMsg, wParam, lParam);
default:
return DefWindowProc(hWnd, iMsg, wParam, lParam);
}
ppg->m_fDirty |= fDirty;
return 0L;
}
/*
* RectConvertMappings
*
* Purpose:
* Converts the contents of a rectangle from device to logical
* coordinates where the hDC defines the logical coordinates.
*
* Parameters:
* pRect LPRECT containing the rectangle to convert.
* hDC HDC describing the logical coordinate system.
* if NULL, uses a screen DC in MM_LOMETRIC.
* fToDevice BOOL TRUE to convert from uConv to device,
* FALSE to convert device to uConv.
*
* Return Value:
* None
*/
void RectConvertMappings(LPRECT pRect, HDC hDC, BOOL fToDevice)
{
POINT rgpt[2];
BOOL fSysDC=FALSE;
if (NULL==pRect)
return;
rgpt[0].x=pRect->left;
rgpt[0].y=pRect->top;
rgpt[1].x=pRect->right;
rgpt[1].y=pRect->bottom;
if (NULL==hDC)
{
hDC=GetDC(NULL);
SetMapMode(hDC, MM_LOMETRIC);
fSysDC=TRUE;
}
if (fToDevice)
LPtoDP(hDC, rgpt, 2);
else
DPtoLP(hDC, rgpt, 2);
if (fSysDC)
ReleaseDC(NULL, hDC);
pRect->left=rgpt[0].x;
pRect->top=rgpt[0].y;
pRect->right=rgpt[1].x;
pRect->bottom=rgpt[1].y;
return;
}
/*
* CPages::Draw
*
* Purpose:
* Paints the current page in the pages window.
*
* Parameters:
* hDC HDC to draw on, could be a metafile or printer
* DC or any other type of DC.
* fNoColor BOOL indicating if we should use screen colors
* or printer colors (B&W). Objects are printed
* as-is, however. This is TRUE for printer DCs
* or print preview.
* fPrinter BOOL indicating if this is a printer DC in which
* case we eliminate some of the fancy drawing,
* like shadows on the page and so forth.
*
* Return Value:
* None
*/
void CPages::Draw(HDC hDC, BOOL fNoColor, BOOL fPrinter)
{
RECT rc, rcT;
UINT uMM;
HPEN hPen;
HBRUSH hBrush;
HGDIOBJ hObj1, hObj2;
COLORREF cr;
TCHAR szTemp[20];
UINT cch;
SIZE sz;
PCPage pPage;
RECT rcPos;
//Make sure the DC is in LOMETRIC
uMM=SetMapMode(hDC, MM_LOMETRIC);
if (!fPrinter)
{
/*
* We maintain a 6mm border around the page on the screen
* besides 12.7mm margins. We also have to account for
* the scroll position with m_*Pos which are in pixels so
* we have to convert them.
*/
SetRect(&rcPos, m_xPos, m_yPos, 0, 0);
RectConvertMappings(&rcPos, hDC, FALSE);
rc.left = LOMETRIC_BORDER-rcPos.left;
rc.top =-LOMETRIC_BORDER-rcPos.top;
}
else
{
/*
* We define the corner of the printed paper at a negative
* offset so rc.right and rc.bottom come out right below.
*/
SetRect(&rc, -(int)m_xMarginLeft, m_yMarginTop, 0, 0);
}
rc.right=rc.left+m_cx+(m_xMarginLeft+m_xMarginRight);
rc.bottom=rc.top-m_cy-(m_yMarginTop+m_yMarginBottom);
//Draw a rect filled with the window color to show the page.
if (!fPrinter)
{
if (fNoColor)
{
//Black frame, white box for printed colors.
hPen =CreatePen(PS_SOLID, 0, RGB(0,0,0));
hBrush=CreateSolidBrush(RGB(255, 255, 255));
}
else
{
//Normal colors on display
hPen=CreatePen(PS_SOLID, 0
, GetSysColor(COLOR_WINDOWFRAME));
hBrush=CreateSolidBrush(GetSysColor(COLOR_WINDOW));
}
hObj1=SelectObject(hDC, hPen);
hObj2=SelectObject(hDC, hBrush);
//Paper boundary
Rectangle(hDC, rc.left, rc.top, rc.right, rc.bottom+1);
/*
* Draw a shadow on the *visual* bottom and right edges
* .5mm wide. If the button shadow color and workspace
* colors match, then use black. We always use black
* when printing as well.
*/
if (fNoColor)
cr=RGB(0,0,0);
else
{
cr=GetSysColor(COLOR_BTNSHADOW);
if (GetSysColor(COLOR_APPWORKSPACE)==cr)
cr=RGB(0,0,0);
}
cr=SetBkColor(hDC, cr);
SetRect(&rcT, rc.left+5, rc.bottom, rc.right+5,rc.bottom-5);
ExtTextOut(hDC, 0, 0, ETO_OPAQUE, &rcT, NULL, 0, NULL);
SetRect(&rcT, rc.right, rc.top-5, rc.right+5, rc.bottom-5);
ExtTextOut(hDC, 0, 0, ETO_OPAQUE, &rcT, NULL, 0, NULL);
SetBkColor(hDC, cr);
SelectObject(hDC, hObj1);
SelectObject(hDC, hObj2);
DeleteObject(hBrush);
DeleteObject(hPen);
}
//Write the page number in the lower left corner
if (!fNoColor)
{
SetTextColor(hDC, GetSysColor(COLOR_WINDOWTEXT));
SetBkColor(hDC, GetSysColor(COLOR_WINDOW));
}
//Write the page number in our page font.
cch=wsprintf(szTemp, TEXT("Page %d"), m_iPageCur+1);
hObj1=SelectObject(hDC, m_hFont);
GetTextExtentPoint(hDC, szTemp, cch, &sz);
TextOut(hDC, rc.left+m_xMarginLeft
, rc.bottom+m_yMarginBottom+sz.cy, szTemp, cch);
SelectObject(hDC, hObj1);
//Rectangle to show border.
MoveToEx(hDC, rc.left+m_xMarginLeft, rc.top-m_yMarginTop, NULL);
LineTo(hDC, rc.left+m_xMarginLeft, rc.bottom+m_yMarginBottom);
LineTo(hDC, rc.right-m_xMarginRight, rc.bottom+m_yMarginBottom);
LineTo(hDC, rc.right-m_xMarginRight, rc.top-m_yMarginTop);
LineTo(hDC, rc.left+m_xMarginLeft, rc.top-m_yMarginTop);
/*
* Go draw the objects on this page. If the page is not open,
* we open it anyway. If it is already open, then opening again
* will bump it's reference count, so the Close in ineffectual.
*/
if (PageGet(m_iPageCur, &pPage, TRUE))
{
if (!fPrinter)
{
pPage->Draw(hDC, rcPos.left, rcPos.top, fNoColor
, fPrinter);
}
else
pPage->Draw(hDC, 0, 0, fNoColor, fPrinter);
pPage->Close(FALSE);
}
SetMapMode(hDC, uMM);
return;
}
/*
* CPages::UpdateScrollRanges
*
* Purpose:
* Reset scrollbar ranges (horizontal and vertical) depending on
* the window size and the page size. This function may remove
* the scrollbars altogether.
*
* Parameters:
* None, but set m_cx, m_cy and size m_hWnd before calling.
*
* Return Value:
* None
*/
void CPages::UpdateScrollRanges(void)
{
UINT cxSB; //Scrollbar width and height.
UINT cySB;
UINT cx, cy;
UINT dx, dy;
UINT u;
int iMin, iMax;
RECT rc;
BOOL fHScroll;
BOOL fVScroll;
BOOL fWasThere;
GetClientRect(m_hWnd, &rc);
cx=rc.right-rc.left;
cy=rc.bottom-rc.top;
//Convert dimensions of the image in LOMETRIC to pixels.
SetRect(&rc, (m_cx+m_xMarginLeft+m_xMarginRight
+LOMETRIC_BORDER*2), (m_cy+m_yMarginTop
+m_yMarginBottom+LOMETRIC_BORDER*2), 0, 0);
RectConvertMappings(&rc, NULL, TRUE);
dx=rc.left;
dy=-rc.top;
//Assume that both scrollbars will be visible.
fHScroll=TRUE;
fVScroll=TRUE;
/*
* Determine:
* 1) Which scrollbars are needed.
* 2) How many divisions to give scrollbars so as to
* only scroll as little as necessary.
*/
//Scrollbar dimensions in our units.
cxSB=GetSystemMetrics(SM_CXVSCROLL);
cySB=GetSystemMetrics(SM_CYHSCROLL);
//Remove horizontal scroll if window >= cxPage+borders
if (cx >= dx)
fHScroll=FALSE;
/*
* If we still need a horizontal scroll, see if we need a
* vertical taking the height of the horizontal scroll into
* account.
*/
u=fHScroll ? cySB : 0;
if ((cy-u) >= dy)
fVScroll=FALSE;
//Check if adding vert scrollbar necessitates a horz now.
u=fVScroll ? cxSB : 0;
fHScroll=((cx-u) < dx);
/*
* Modify cx,cy to reflect the new client area before scaling
* scrollbars. We only affect the client size if there is a
* *change* in scrollbar status: if the scrollbar was there
* but is no longer, then add to the client size; if it was
* not there but now is, then subtract.
*/
//Change cx depending on vertical scrollbar change
GetScrollRange(m_hWnd, SB_VERT, &iMin, &iMax);
fWasThere=(0!=iMin || 0!=iMax);
if (fWasThere && !fVScroll)
cx+=cxSB;
if (!fWasThere && fVScroll)
cx-=cxSB;
//Change cy depending on horizontal scrollbar change
GetScrollRange(m_hWnd, SB_HORZ, &iMin, &iMax);
fWasThere=(0!=iMin || 0!=iMax);
if (fWasThere && !fHScroll)
cy+=cySB;
if (!fWasThere && fHScroll)
cy-=cySB;
/*
* Show/Hide the scrollbars if necessary and set the ranges.
* The range is the number of units of the page we cannot see.
*/
if (fHScroll)
{
//Convert current scroll position to new range.
u=GetScrollPos(m_hWnd, SB_HORZ);
if (0!=u)
{
GetScrollRange(m_hWnd, SB_HORZ, &iMin, &iMax);
u=MulDiv(u, (dx-cx), (iMax-iMin));
}
SetScrollRange(m_hWnd, SB_HORZ, 0, dx-cx, FALSE);
SetScrollPos(m_hWnd, SB_HORZ, u, TRUE);
m_xPos=u;
}
else
{
SetScrollRange(m_hWnd, SB_HORZ, 0, 0, TRUE);
m_xPos=0;
}
if (fVScroll)
{
//Convert current scroll position to new range.
u=GetScrollPos(m_hWnd, SB_VERT);
if (0!=u)
{
GetScrollRange(m_hWnd, SB_VERT, &iMin, &iMax);
u=MulDiv(u, (dy-cy), (iMax-iMin));
}
SetScrollRange(m_hWnd, SB_VERT, 0, dy-cy, FALSE);
SetScrollPos(m_hWnd, SB_VERT, u, TRUE);
m_yPos=u;
}
else
{
SetScrollRange(m_hWnd, SB_VERT, 0, 0, TRUE);
m_yPos=0;
}
//Repaint to insure that changes to m_x/yPos are reflected
InvalidateRect(m_hWnd, NULL, TRUE);
return;
}