print.c 38.5 KB
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/*
 * Wordpad implementation - Printing and print preview functions
 *
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 * Copyright 2007-2008 by Alexander N. Sørnes <alex@thehandofagony.com>
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 *
 * 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
 */

#include <windows.h>
#include <richedit.h>
#include <commctrl.h>
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#include <commdlg.h>
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#include "wordpad.h"

typedef struct _previewinfo
{
    int page;
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    int pages_shown;
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    int saved_pages_shown;
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    int *pageEnds, pageCapacity;
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    int textlength;
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    HDC hdc;
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    HDC hdc2;
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    RECT window;
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    RECT rcPage;
    SIZE bmSize;
    SIZE bmScaledSize;
    SIZE spacing;
    float zoomratio;
    int zoomlevel;
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    LPWSTR wszFileName;
} previewinfo, *ppreviewinfo;

static HGLOBAL devMode;
static HGLOBAL devNames;

static RECT margins;
static previewinfo preview;

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extern const WCHAR wszPreviewWndClass[];

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static const WCHAR var_pagemargin[] = {'P','a','g','e','M','a','r','g','i','n',0};
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static const WCHAR var_previewpages[] = {'P','r','e','v','i','e','w','P','a','g','e','s',0};
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static LPWSTR get_print_file_filter(HWND hMainWnd)
{
    static WCHAR wszPrintFilter[MAX_STRING_LEN*2+6+4+1];
    const WCHAR files_prn[] = {'*','.','P','R','N',0};
    const WCHAR files_all[] = {'*','.','*','\0'};
    LPWSTR p;
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    HINSTANCE hInstance = GetModuleHandleW(0);
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    p = wszPrintFilter;
    LoadStringW(hInstance, STRING_PRINTER_FILES_PRN, p, MAX_STRING_LEN);
    p += lstrlenW(p) + 1;
    lstrcpyW(p, files_prn);
    p += lstrlenW(p) + 1;
    LoadStringW(hInstance, STRING_ALL_FILES, p, MAX_STRING_LEN);
    p += lstrlenW(p) + 1;
    lstrcpyW(p, files_all);
    p += lstrlenW(p) + 1;
    *p = 0;

    return wszPrintFilter;
}

void registry_set_pagemargins(HKEY hKey)
{
    RegSetValueExW(hKey, var_pagemargin, 0, REG_BINARY, (LPBYTE)&margins, sizeof(RECT));
}

void registry_read_pagemargins(HKEY hKey)
{
    DWORD size = sizeof(RECT);

    if(!hKey || RegQueryValueExW(hKey, var_pagemargin, 0, NULL, (LPBYTE)&margins,
                     &size) != ERROR_SUCCESS || size != sizeof(RECT))
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        SetRect(&margins, 1757, 1417, 1757, 1417);
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}

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void registry_set_previewpages(HKEY hKey)
{
    RegSetValueExW(hKey, var_previewpages, 0, REG_DWORD,
                   (LPBYTE)&preview.pages_shown, sizeof(DWORD));
}

void registry_read_previewpages(HKEY hKey)
{
    DWORD size = sizeof(DWORD);
    if(!hKey ||
       RegQueryValueExW(hKey, var_previewpages, 0, NULL,
                        (LPBYTE)&preview.pages_shown, &size) != ERROR_SUCCESS ||
       size != sizeof(DWORD))
    {
        preview.pages_shown = 1;
    } else {
        if (preview.pages_shown < 1) preview.pages_shown = 1;
        else if (preview.pages_shown > 2) preview.pages_shown = 2;
    }
}


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static void AddTextButton(HWND hRebarWnd, UINT string, UINT command, UINT id)
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{
    REBARBANDINFOW rb;
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    HINSTANCE hInstance = GetModuleHandleW(0);
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    WCHAR text[MAX_STRING_LEN];
    HWND hButton;

    LoadStringW(hInstance, string, text, MAX_STRING_LEN);
    hButton = CreateWindowW(WC_BUTTONW, text,
                            WS_VISIBLE | WS_CHILD, 5, 5, 100, 15,
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                            hRebarWnd, ULongToHandle(command), hInstance, NULL);
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    rb.cbSize = REBARBANDINFOW_V6_SIZE;
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    rb.fMask = RBBIM_SIZE | RBBIM_CHILDSIZE | RBBIM_STYLE | RBBIM_CHILD | RBBIM_IDEALSIZE | RBBIM_ID;
    rb.fStyle = RBBS_NOGRIPPER | RBBS_VARIABLEHEIGHT;
    rb.hwndChild = hButton;
    rb.cyChild = rb.cyMinChild = 22;
    rb.cx = rb.cxMinChild = 90;
    rb.cxIdeal = 100;
    rb.wID = id;

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    SendMessageW(hRebarWnd, RB_INSERTBANDW, -1, (LPARAM)&rb);
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}

static HDC make_dc(void)
{
    if(devNames && devMode)
    {
        LPDEVNAMES dn = GlobalLock(devNames);
        LPDEVMODEW dm = GlobalLock(devMode);
        HDC ret;

        ret = CreateDCW((LPWSTR)dn + dn->wDriverOffset,
                         (LPWSTR)dn + dn->wDeviceOffset, 0, dm);

        GlobalUnlock(dn);
        GlobalUnlock(dm);

        return ret;
    } else
    {
        return 0;
    }
}

static LONG twips_to_centmm(int twips)
{
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    return MulDiv(twips, CENTMM_PER_INCH, TWIPS_PER_INCH);
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}

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static LONG centmm_to_twips(int mm)
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{
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    return MulDiv(mm, TWIPS_PER_INCH, CENTMM_PER_INCH);
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}

static LONG twips_to_pixels(int twips, int dpi)
{
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    return MulDiv(twips, dpi, TWIPS_PER_INCH);
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}

static LONG devunits_to_twips(int units, int dpi)
{
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    return MulDiv(units, TWIPS_PER_INCH, dpi);
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}


static RECT get_print_rect(HDC hdc)
{
    RECT rc;
    int width, height;

    if(hdc)
    {
        int dpiY = GetDeviceCaps(hdc, LOGPIXELSY);
        int dpiX = GetDeviceCaps(hdc, LOGPIXELSX);
        width = devunits_to_twips(GetDeviceCaps(hdc, PHYSICALWIDTH), dpiX);
        height = devunits_to_twips(GetDeviceCaps(hdc, PHYSICALHEIGHT), dpiY);
    } else
    {
        width = centmm_to_twips(18500);
        height = centmm_to_twips(27000);
    }

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    SetRect(&rc, margins.left, margins.top, width - margins.right, height - margins.bottom);
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    return rc;
}

void target_device(HWND hMainWnd, DWORD wordWrap)
{
    HWND hEditorWnd = GetDlgItem(hMainWnd, IDC_EDITOR);

    if(wordWrap == ID_WORDWRAP_MARGIN)
    {
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        int width = 0;
        LRESULT result;
        HDC hdc = make_dc();
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        RECT rc = get_print_rect(hdc);
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        width = rc.right - rc.left;
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        if(!hdc)
        {
            HDC hMaindc = GetDC(hMainWnd);
            hdc = CreateCompatibleDC(hMaindc);
            ReleaseDC(hMainWnd, hMaindc);
        }
        result = SendMessageW(hEditorWnd, EM_SETTARGETDEVICE, (WPARAM)hdc, width);
        DeleteDC(hdc);
        if (result)
            return;
        /* otherwise EM_SETTARGETDEVICE failed, so fall back on wrapping
         * to window using the NULL DC. */
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    }

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    if (wordWrap != ID_WORDWRAP_NONE) {
        SendMessageW(hEditorWnd, EM_SETTARGETDEVICE, 0, 0);
    } else {
        SendMessageW(hEditorWnd, EM_SETTARGETDEVICE, 0, 1);
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    }

}

static LPWSTR dialog_print_to_file(HWND hMainWnd)
{
    OPENFILENAMEW ofn;
    static WCHAR file[MAX_PATH] = {'O','U','T','P','U','T','.','P','R','N',0};
    static const WCHAR defExt[] = {'P','R','N',0};
    static LPWSTR file_filter;

    if(!file_filter)
        file_filter = get_print_file_filter(hMainWnd);

    ZeroMemory(&ofn, sizeof(ofn));

    ofn.lStructSize = sizeof(ofn);
    ofn.Flags = OFN_PATHMUSTEXIST | OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT;
    ofn.hwndOwner = hMainWnd;
    ofn.lpstrFilter = file_filter;
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    ofn.lpstrFile = file;
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    ofn.nMaxFile = MAX_PATH;
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    ofn.lpstrDefExt = defExt;
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    if(GetSaveFileNameW(&ofn))
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        return file;
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    else
        return FALSE;
}

static void char_from_pagenum(HWND hEditorWnd, FORMATRANGE *fr, int page)
{
    int i;

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    fr->chrg.cpMin = 0;
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    for(i = 1; i < page; i++)
    {
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        int bottom = fr->rc.bottom;
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        fr->chrg.cpMin = SendMessageW(hEditorWnd, EM_FORMATRANGE, FALSE, (LPARAM)fr);
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        fr->rc.bottom = bottom;
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    }
}

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static HWND get_ruler_wnd(HWND hMainWnd)
{
    return GetDlgItem(GetDlgItem(hMainWnd, IDC_REBAR), IDC_RULER);
}

void redraw_ruler(HWND hRulerWnd)
{
    RECT rc;

    GetClientRect(hRulerWnd, &rc);
    InvalidateRect(hRulerWnd, &rc, TRUE);
}

static void update_ruler(HWND hRulerWnd)
{
     SendMessageW(hRulerWnd, WM_USER, 0, 0);
     redraw_ruler(hRulerWnd);
}

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static void add_ruler_units(HDC hdcRuler, RECT* drawRect, BOOL NewMetrics, LONG EditLeftmost)
{
    static HDC hdc;

    if(NewMetrics)
    {
        static HBITMAP hBitmap;
        int i, x, y, RulerTextEnd;
        int CmPixels;
        int QuarterCmPixels;
        HFONT hFont;
        WCHAR FontName[] = {'M','S',' ','S','a','n','s',' ','S','e','r','i','f',0};

        if(hdc)
        {
            DeleteDC(hdc);
            DeleteObject(hBitmap);
        }

        hdc = CreateCompatibleDC(0);

        CmPixels = twips_to_pixels(centmm_to_twips(1000), GetDeviceCaps(hdc, LOGPIXELSX));
        QuarterCmPixels = (int)((float)CmPixels / 4.0);

        hBitmap = CreateCompatibleBitmap(hdc, drawRect->right, drawRect->bottom);
        SelectObject(hdc, hBitmap);
        FillRect(hdc, drawRect, GetStockObject(WHITE_BRUSH));

        hFont = CreateFontW(10, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, FontName);

        SelectObject(hdc, hFont);
        SetBkMode(hdc, TRANSPARENT);
        SetTextAlign(hdc, TA_CENTER);
        y = (int)(((float)drawRect->bottom - (float)drawRect->top) / 2.0) + 1;
        RulerTextEnd = drawRect->right - EditLeftmost + 1;
        for(i = 1, x = EditLeftmost; x < (drawRect->right - EditLeftmost + 1); i ++)
        {
            WCHAR str[3];
            WCHAR format[] = {'%','d',0};
            int x2 = x;

            x2 += QuarterCmPixels;
            if(x2 > RulerTextEnd)
                break;

            MoveToEx(hdc, x2, y, NULL);
            LineTo(hdc, x2, y+2);

            x2 += QuarterCmPixels;
            if(x2 > RulerTextEnd)
                break;

            MoveToEx(hdc, x2, y - 3, NULL);
            LineTo(hdc, x2, y + 3);

            x2 += QuarterCmPixels;
            if(x2 > RulerTextEnd)
                break;

            MoveToEx(hdc, x2, y, NULL);
            LineTo(hdc, x2, y+2);

            x += CmPixels;
            if(x > RulerTextEnd)
                break;

            wsprintfW(str, format, i);
            TextOutW(hdc, x, 5, str, lstrlenW(str));
        }
        DeleteObject(hFont);
    }

    BitBlt(hdcRuler, 0, 0, drawRect->right, drawRect->bottom, hdc, 0, 0, SRCAND);
}

static void paint_ruler(HWND hWnd, LONG EditLeftmost, BOOL NewMetrics)
{
    PAINTSTRUCT ps;
    HDC hdc = BeginPaint(hWnd, &ps);
    HDC hdcPrint = make_dc();
    RECT printRect = get_print_rect(hdcPrint);
    RECT drawRect;
    HBRUSH hBrush = CreateSolidBrush(GetSysColor(COLOR_MENU));

    GetClientRect(hWnd, &drawRect);
    FillRect(hdc, &drawRect, hBrush);

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    InflateRect(&drawRect, 0, -3);
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    drawRect.left = EditLeftmost;
    drawRect.right = twips_to_pixels(printRect.right - margins.left, GetDeviceCaps(hdc, LOGPIXELSX));
    FillRect(hdc, &drawRect, GetStockObject(WHITE_BRUSH));

    drawRect.top--;
    drawRect.bottom++;
    DrawEdge(hdc, &drawRect, EDGE_SUNKEN, BF_RECT);

    drawRect.left = drawRect.right - 1;
    drawRect.right = twips_to_pixels(printRect.right + margins.right - margins.left, GetDeviceCaps(hdc, LOGPIXELSX));
    DrawEdge(hdc, &drawRect, EDGE_ETCHED, BF_RECT);

    drawRect.left = 0;
    drawRect.top = 0;
    add_ruler_units(hdc, &drawRect, NewMetrics, EditLeftmost);

    SelectObject(hdc, GetStockObject(BLACK_BRUSH));
    DeleteObject(hBrush);
    DeleteDC(hdcPrint);
    EndPaint(hWnd, &ps);
}

LRESULT CALLBACK ruler_proc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    static WNDPROC pPrevRulerProc;
    static LONG EditLeftmost;
    static BOOL NewMetrics;

    switch(msg)
    {
        case WM_USER:
            if(wParam)
            {
                EditLeftmost = ((POINTL*)wParam)->x;
                pPrevRulerProc = (WNDPROC)lParam;
            }
            NewMetrics = TRUE;
            break;

        case WM_PAINT:
            paint_ruler(hWnd, EditLeftmost, NewMetrics);
            break;

        default:
            return CallWindowProcW(pPrevRulerProc, hWnd, msg, wParam, lParam);
    }

    return 0;
}

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static void print(LPPRINTDLGW pd, LPWSTR wszFileName)
{
    FORMATRANGE fr;
    DOCINFOW di;
    HWND hEditorWnd = GetDlgItem(pd->hwndOwner, IDC_EDITOR);
    int printedPages = 0;

    fr.hdc = pd->hDC;
    fr.hdcTarget = pd->hDC;

    fr.rc = get_print_rect(fr.hdc);
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    SetRect(&fr.rcPage, 0, 0, fr.rc.right + margins.right, fr.rc.bottom + margins.bottom);
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    ZeroMemory(&di, sizeof(di));
    di.cbSize = sizeof(di);
    di.lpszDocName = wszFileName;

    if(pd->Flags & PD_PRINTTOFILE)
    {
        di.lpszOutput = dialog_print_to_file(pd->hwndOwner);
        if(!di.lpszOutput)
            return;
    }

    if(pd->Flags & PD_SELECTION)
    {
        SendMessageW(hEditorWnd, EM_EXGETSEL, 0, (LPARAM)&fr.chrg);
    } else
    {
        GETTEXTLENGTHEX gt;
        gt.flags = GTL_DEFAULT;
        gt.codepage = 1200;
        fr.chrg.cpMin = 0;
        fr.chrg.cpMax = SendMessageW(hEditorWnd, EM_GETTEXTLENGTHEX, (WPARAM)&gt, 0);

        if(pd->Flags & PD_PAGENUMS)
            char_from_pagenum(hEditorWnd, &fr, pd->nToPage);
    }

    StartDocW(fr.hdc, &di);
    do
    {
        if(StartPage(fr.hdc) <= 0)
            break;

        fr.chrg.cpMin = SendMessageW(hEditorWnd, EM_FORMATRANGE, TRUE, (LPARAM)&fr);

        if(EndPage(fr.hdc) <= 0)
            break;

        printedPages++;
        if((pd->Flags & PD_PAGENUMS) && (printedPages > (pd->nToPage - pd->nFromPage)))
            break;
    }
    while(fr.chrg.cpMin && fr.chrg.cpMin < fr.chrg.cpMax);

    EndDoc(fr.hdc);
    SendMessageW(hEditorWnd, EM_FORMATRANGE, FALSE, 0);
}

void dialog_printsetup(HWND hMainWnd)
{
    PAGESETUPDLGW ps;

    ZeroMemory(&ps, sizeof(ps));
    ps.lStructSize = sizeof(ps);
    ps.hwndOwner = hMainWnd;
    ps.Flags = PSD_INHUNDREDTHSOFMILLIMETERS | PSD_MARGINS;
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    SetRect(&ps.rtMargin, twips_to_centmm(margins.left), twips_to_centmm(margins.top),
            twips_to_centmm(margins.right), twips_to_centmm(margins.bottom));
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    ps.hDevMode = devMode;
    ps.hDevNames = devNames;

    if(PageSetupDlgW(&ps))
    {
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        SetRect(&margins, centmm_to_twips(ps.rtMargin.left), centmm_to_twips(ps.rtMargin.top),
                centmm_to_twips(ps.rtMargin.right), centmm_to_twips(ps.rtMargin.bottom));
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        devMode = ps.hDevMode;
        devNames = ps.hDevNames;
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        update_ruler(get_ruler_wnd(hMainWnd));
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    }
}

void get_default_printer_opts(void)
{
    PRINTDLGW pd;
    ZeroMemory(&pd, sizeof(pd));

    ZeroMemory(&pd, sizeof(pd));
    pd.lStructSize = sizeof(pd);
    pd.Flags = PD_RETURNDC | PD_RETURNDEFAULT;
    pd.hDevMode = devMode;

    PrintDlgW(&pd);

    devMode = pd.hDevMode;
    devNames = pd.hDevNames;
}

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void print_quick(HWND hMainWnd, LPWSTR wszFileName)
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{
    PRINTDLGW pd;

    ZeroMemory(&pd, sizeof(pd));
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    pd.hwndOwner = hMainWnd;
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    pd.hDC = make_dc();

    print(&pd, wszFileName);
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    DeleteDC(pd.hDC);
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}

void dialog_print(HWND hMainWnd, LPWSTR wszFileName)
{
    PRINTDLGW pd;
    HWND hEditorWnd = GetDlgItem(hMainWnd, IDC_EDITOR);
    int from = 0;
    int to = 0;

    ZeroMemory(&pd, sizeof(pd));
    pd.lStructSize = sizeof(pd);
    pd.hwndOwner = hMainWnd;
    pd.Flags = PD_RETURNDC | PD_USEDEVMODECOPIESANDCOLLATE;
    pd.nMinPage = 1;
    pd.nMaxPage = -1;
    pd.hDevMode = devMode;
    pd.hDevNames = devNames;

    SendMessageW(hEditorWnd, EM_GETSEL, (WPARAM)&from, (LPARAM)&to);
    if(from == to)
        pd.Flags |= PD_NOSELECTION;

    if(PrintDlgW(&pd))
    {
        devMode = pd.hDevMode;
        devNames = pd.hDevNames;
        print(&pd, wszFileName);
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        update_ruler(get_ruler_wnd(hMainWnd));
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    }
}

static void preview_bar_show(HWND hMainWnd, BOOL show)
{
    HWND hReBar = GetDlgItem(hMainWnd, IDC_REBAR);
    int i;

    if(show)
    {
        REBARBANDINFOW rb;
        HWND hStatic;
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        UINT num_pages_string = preview.pages_shown > 1 ? STRING_PREVIEW_ONEPAGE :
                                                          STRING_PREVIEW_TWOPAGES;
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        AddTextButton(hReBar, STRING_PREVIEW_PRINT, ID_PRINT, BANDID_PREVIEW_BTN1);
        AddTextButton(hReBar, STRING_PREVIEW_NEXTPAGE, ID_PREVIEW_NEXTPAGE, BANDID_PREVIEW_BTN2);
        AddTextButton(hReBar, STRING_PREVIEW_PREVPAGE, ID_PREVIEW_PREVPAGE, BANDID_PREVIEW_BTN3);
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        AddTextButton(hReBar, num_pages_string, ID_PREVIEW_NUMPAGES, BANDID_PREVIEW_BTN4);
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        AddTextButton(hReBar, STRING_PREVIEW_ZOOMIN, ID_PREVIEW_ZOOMIN, BANDID_PREVIEW_BTN5);
        AddTextButton(hReBar, STRING_PREVIEW_ZOOMOUT, ID_PREVIEW_ZOOMOUT, BANDID_PREVIEW_BTN6);
        AddTextButton(hReBar, STRING_PREVIEW_CLOSE, ID_FILE_EXIT, BANDID_PREVIEW_BTN7);
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        hStatic = CreateWindowW(WC_STATICW, NULL,
                                WS_VISIBLE | WS_CHILD, 0, 0, 0, 0,
                                hReBar, NULL, NULL, NULL);

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        rb.cbSize = REBARBANDINFOW_V6_SIZE;
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        rb.fMask = RBBIM_SIZE | RBBIM_CHILDSIZE | RBBIM_STYLE | RBBIM_CHILD | RBBIM_IDEALSIZE | RBBIM_ID;
        rb.fStyle = RBBS_NOGRIPPER | RBBS_VARIABLEHEIGHT;
        rb.hwndChild = hStatic;
        rb.cyChild = rb.cyMinChild = 22;
        rb.cx = rb.cxMinChild = 90;
        rb.cxIdeal = 100;
        rb.wID = BANDID_PREVIEW_BUFFER;

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        SendMessageW(hReBar, RB_INSERTBANDW, -1, (LPARAM)&rb);
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    } else
    {
        for(i = 0; i <= PREVIEW_BUTTONS; i++)
            SendMessageW(hReBar, RB_DELETEBAND, SendMessageW(hReBar, RB_IDTOINDEX, BANDID_PREVIEW_BTN1+i, 0), 0);
    }
}

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static const int min_spacing = 10;

static void update_preview_scrollbars(HWND hwndPreview, RECT *window)
{
    SCROLLINFO sbi;
    sbi.cbSize = sizeof(sbi);
    sbi.fMask = SIF_PAGE|SIF_RANGE;
    sbi.nMin = 0;
    if (preview.zoomlevel == 0)
    {
        /* Hide scrollbars when zoomed out. */
        sbi.nMax = 0;
        sbi.nPage = window->right;
        SetScrollInfo(hwndPreview, SB_HORZ, &sbi, TRUE);
        sbi.nPage = window->bottom;
        SetScrollInfo(hwndPreview, SB_VERT, &sbi, TRUE);
    } else {
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        sbi.nMax = preview.bmScaledSize.cx * preview.pages_shown +
                   min_spacing * (preview.pages_shown + 1);
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        sbi.nPage = window->right;
        SetScrollInfo(hwndPreview, SB_HORZ, &sbi, TRUE);
        /* Change in the horizontal scrollbar visibility affects the
         * client rect, so update the client rect. */
        GetClientRect(hwndPreview, window);
        sbi.nMax = preview.bmScaledSize.cy + min_spacing * 2;
        sbi.nPage = window->bottom;
        SetScrollInfo(hwndPreview, SB_VERT, &sbi, TRUE);
    }
}

static void update_preview_sizes(HWND hwndPreview, BOOL zoomLevelUpdated)
{
    RECT window;

    GetClientRect(hwndPreview, &window);

    /* The zoom ratio isn't updated for partial zoom because of resizing the window. */
    if (zoomLevelUpdated || preview.zoomlevel != 1)
    {
        float ratio, ratioHeight, ratioWidth;
        if (preview.zoomlevel == 2)
        {
            ratio = 1.0;
        } else {
            ratioHeight = (window.bottom - min_spacing * 2) / (float)preview.bmSize.cy;

662 663 664
            ratioWidth = (float)(window.right -
                                 min_spacing * (preview.pages_shown + 1)) /
                         (preview.pages_shown * preview.bmSize.cx);
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            if(ratioWidth > ratioHeight)
                ratio = ratioHeight;
            else
                ratio = ratioWidth;

            if (preview.zoomlevel == 1)
                ratio += (1.0 - ratio) / 2;
        }
        preview.zoomratio = ratio;
    }

    preview.bmScaledSize.cx = preview.bmSize.cx * preview.zoomratio;
    preview.bmScaledSize.cy = preview.bmSize.cy * preview.zoomratio;

    preview.spacing.cy = max(min_spacing, (window.bottom - preview.bmScaledSize.cy) / 2);

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    preview.spacing.cx = (window.right -
                          preview.bmScaledSize.cx * preview.pages_shown) /
                         (preview.pages_shown + 1);
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    if (preview.spacing.cx < min_spacing)
        preview.spacing.cx = min_spacing;

    update_preview_scrollbars(hwndPreview, &window);
}

691
static void draw_margin_lines(HDC hdc, int x, int y, float ratio)
692 693
{
    HPEN hPen, oldPen;
694 695
    SIZE dpi;
    RECT page_margin = preview.rcPage;
696

697 698 699
    dpi.cx = GetDeviceCaps(hdc, LOGPIXELSX);
    dpi.cy = GetDeviceCaps(hdc, LOGPIXELSY);

700 701
    SetRect(&page_margin, preview.rcPage.left + margins.left, preview.rcPage.top + margins.top,
            preview.rcPage.right - margins.right, preview.rcPage.bottom - margins.bottom);
702

703 704 705 706
    page_margin.left = (int)((float)twips_to_pixels(page_margin.left, dpi.cx) * ratio);
    page_margin.top = (int)((float)twips_to_pixels(page_margin.top, dpi.cy) * ratio);
    page_margin.bottom = (int)((float)twips_to_pixels(page_margin.bottom, dpi.cy) * ratio);
    page_margin.right = (int)((float)twips_to_pixels(page_margin.right, dpi.cx) * ratio);
707

708
    OffsetRect(&page_margin, x, y);
709

710
    hPen = CreatePen(PS_DOT, 1, RGB(0,0,0));
711
    oldPen = SelectObject(hdc, hPen);
712

713 714 715 716
    MoveToEx(hdc, x, page_margin.top, NULL);
    LineTo(hdc, x + preview.bmScaledSize.cx, page_margin.top);
    MoveToEx(hdc, x, page_margin.bottom, NULL);
    LineTo(hdc, x + preview.bmScaledSize.cx, page_margin.bottom);
717

718 719 720 721
    MoveToEx(hdc, page_margin.left, y, NULL);
    LineTo(hdc, page_margin.left, y + preview.bmScaledSize.cy);
    MoveToEx(hdc, page_margin.right, y, NULL);
    LineTo(hdc, page_margin.right, y + preview.bmScaledSize.cy);
722

723
    SelectObject(hdc, oldPen);
724 725
    DeleteObject(hPen);
}
726

727 728 729 730 731
static BOOL is_last_preview_page(int page)
{
    return preview.pageEnds[page - 1] >= preview.textlength;
}

732 733 734 735 736 737 738 739 740 741
void init_preview(HWND hMainWnd, LPWSTR wszFileName)
{
    HINSTANCE hInstance = GetModuleHandleW(0);
    preview.page = 1;
    preview.hdc = 0;
    preview.hdc2 = 0;
    preview.wszFileName = wszFileName;
    preview.zoomratio = 0;
    preview.zoomlevel = 0;
    preview_bar_show(hMainWnd, TRUE);
742

743
    CreateWindowExW(0, wszPreviewWndClass, NULL,
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            WS_VISIBLE | WS_CHILD | WS_VSCROLL | WS_HSCROLL,
            0, 0, 200, 10, hMainWnd, (HMENU)IDC_PREVIEW, hInstance, NULL);
}

void close_preview(HWND hMainWnd)
749
{
750 751 752 753 754 755 756
    HWND hwndPreview = GetDlgItem(hMainWnd, IDC_PREVIEW);
    preview.window.right = 0;
    preview.window.bottom = 0;
    preview.page = 0;
    HeapFree(GetProcessHeap(), 0, preview.pageEnds);
    preview.pageEnds = NULL;
    preview.pageCapacity = 0;
757 758
    if (preview.zoomlevel > 0)
        preview.pages_shown = preview.saved_pages_shown;
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    if(preview.hdc) {
        HBITMAP oldbm = GetCurrentObject(preview.hdc, OBJ_BITMAP);
        DeleteDC(preview.hdc);
        DeleteObject(oldbm);
        preview.hdc = NULL;
    }
    if(preview.hdc2) {
        HBITMAP oldbm = GetCurrentObject(preview.hdc2, OBJ_BITMAP);
        DeleteDC(preview.hdc2);
        DeleteObject(oldbm);
        preview.hdc2 = NULL;
    }
771

772 773 774
    preview_bar_show(hMainWnd, FALSE);
    DestroyWindow(hwndPreview);
}
775

776 777 778 779
BOOL preview_isactive(void)
{
    return preview.page != 0;
}
780

781 782 783
static void draw_preview(HWND hEditorWnd, FORMATRANGE* lpFr, RECT* paper, int page)
{
    int bottom;
784

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    if (!preview.pageEnds)
    {
        preview.pageCapacity = 32;
        preview.pageEnds = HeapAlloc(GetProcessHeap(), 0,
                                    sizeof(int) * preview.pageCapacity);
        if (!preview.pageEnds) return;
    } else if (page >= preview.pageCapacity) {
        int *new_buffer;
        new_buffer = HeapReAlloc(GetProcessHeap(), 0, preview.pageEnds,
                                 sizeof(int) * preview.pageCapacity * 2);
        if (!new_buffer) return;
        preview.pageCapacity *= 2;
        preview.pageEnds = new_buffer;
    }

800
    FillRect(lpFr->hdc, paper, GetStockObject(WHITE_BRUSH));
801 802
    if (page > 1 && is_last_preview_page(page - 1)) return;
    lpFr->chrg.cpMin = page <= 1 ? 0 : preview.pageEnds[page-2];
803
    bottom = lpFr->rc.bottom;
804 805
    preview.pageEnds[page-1] = SendMessageW(hEditorWnd, EM_FORMATRANGE, TRUE, (LPARAM)lpFr);

806 807 808
    /* EM_FORMATRANGE sets fr.rc.bottom to indicate the area printed in,
     * but we want to keep the original for drawing margins */
    lpFr->rc.bottom = bottom;
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    SendMessageW(hEditorWnd, EM_FORMATRANGE, FALSE, 0);
}

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static void update_preview_buttons(HWND hMainWnd)
{
    HWND hReBar = GetDlgItem(hMainWnd, IDC_REBAR);
    EnableWindow(GetDlgItem(hReBar, ID_PREVIEW_PREVPAGE), preview.page > 1);
816
    EnableWindow(GetDlgItem(hReBar, ID_PREVIEW_NEXTPAGE),
817
                 !is_last_preview_page(preview.page) &&
818 819
                 !is_last_preview_page(preview.page + preview.pages_shown - 1));
    EnableWindow(GetDlgItem(hReBar, ID_PREVIEW_NUMPAGES),
820 821
                 preview.pages_shown > 1 ||
                 (!is_last_preview_page(1) && preview.zoomlevel == 0));
822 823 824 825
    EnableWindow(GetDlgItem(hReBar, ID_PREVIEW_ZOOMIN), preview.zoomlevel < 2);
    EnableWindow(GetDlgItem(hReBar, ID_PREVIEW_ZOOMOUT), preview.zoomlevel > 0);
}

826
static LRESULT print_preview(HWND hwndPreview)
827
{
828
    HPEN hPen, oldPen;
829
    HDC hdc;
830
    HRGN back_rgn, excl_rgn;
831 832
    RECT window, background;
    PAINTSTRUCT ps;
833
    int x, y;
834

835 836
    hdc = BeginPaint(hwndPreview, &ps);
    GetClientRect(hwndPreview, &window);
837
    back_rgn = CreateRectRgnIndirect(&window);
838

839 840
    x = preview.spacing.cx - GetScrollPos(hwndPreview, SB_HORZ);
    y = preview.spacing.cy - GetScrollPos(hwndPreview, SB_VERT);
841

842 843 844
    /* draw page outlines */
    hPen = CreatePen(PS_SOLID|PS_INSIDEFRAME, 2, RGB(0,0,0));
    oldPen = SelectObject(hdc, hPen);
845 846
    SetRect(&background, x - 2, y - 2, x + preview.bmScaledSize.cx + 2,
            y + preview.bmScaledSize.cy + 2);
847 848 849 850
    Rectangle(hdc, background.left, background.top,
              background.right, background.bottom);
    excl_rgn = CreateRectRgnIndirect(&background);
    CombineRgn(back_rgn, back_rgn, excl_rgn, RGN_DIFF);
851
    if(preview.pages_shown > 1)
852 853 854
    {
        background.left += preview.bmScaledSize.cx + preview.spacing.cx;
        background.right += preview.bmScaledSize.cx + preview.spacing.cx;
855 856 857 858 859
        Rectangle(hdc, background.left, background.top,
                  background.right, background.bottom);
        SetRectRgn(excl_rgn, background.left, background.top,
                   background.right, background.bottom);
        CombineRgn(back_rgn, back_rgn, excl_rgn, RGN_DIFF);
860
    }
861 862 863 864 865
    SelectObject(hdc, oldPen);
    DeleteObject(hPen);
    FillRgn(hdc, back_rgn, GetStockObject(GRAY_BRUSH));
    DeleteObject(excl_rgn);
    DeleteObject(back_rgn);
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867 868 869 870
    StretchBlt(hdc, x, y, preview.bmScaledSize.cx, preview.bmScaledSize.cy,
               preview.hdc, 0, 0, preview.bmSize.cx, preview.bmSize.cy, SRCCOPY);

    draw_margin_lines(hdc, x, y, preview.zoomratio);
871

872
    if(preview.pages_shown > 1)
873
    {
874 875 876 877 878 879
        if (!is_last_preview_page(preview.page)) {
            x += preview.spacing.cx + preview.bmScaledSize.cx;
            StretchBlt(hdc, x, y,
                       preview.bmScaledSize.cx, preview.bmScaledSize.cy,
                       preview.hdc2, 0, 0,
                       preview.bmSize.cx, preview.bmSize.cy, SRCCOPY);
880 881

            draw_margin_lines(hdc, x, y, preview.zoomratio);
882
        } else {
883
            InflateRect(&background, -2, -2);
884 885
            FillRect(hdc, &background, GetStockObject(WHITE_BRUSH));
        }
886 887
    }

888 889
    preview.window = window;

890
    EndPaint(hwndPreview, &ps);
891 892 893 894

    return 0;
}

895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915
static void update_preview_statusbar(HWND hMainWnd)
{
    HWND hStatusbar = GetDlgItem(hMainWnd, IDC_STATUSBAR);
    HINSTANCE hInst = GetModuleHandleW(0);
    WCHAR *p;
    WCHAR wstr[MAX_STRING_LEN];

    p = wstr;
    if (preview.pages_shown < 2 || is_last_preview_page(preview.page))
    {
        static const WCHAR fmt[] = {' ','%','d','\0'};
        p += LoadStringW(hInst, STRING_PREVIEW_PAGE, wstr, MAX_STRING_LEN);
        wsprintfW(p, fmt, preview.page);
    } else {
        static const WCHAR fmt[] = {' ','%','d','-','%','d','\0'};
        p += LoadStringW(hInst, STRING_PREVIEW_PAGES, wstr, MAX_STRING_LEN);
        wsprintfW(p, fmt, preview.page, preview.page + 1);
    }
    SetWindowTextW(hStatusbar, wstr);
}

916 917
/* Update for page changes. */
static void update_preview(HWND hMainWnd)
918
{
919 920 921 922 923 924 925 926 927 928 929 930 931 932 933
    RECT paper;
    HWND hEditorWnd = GetDlgItem(hMainWnd, IDC_EDITOR);
    HWND hwndPreview = GetDlgItem(hMainWnd, IDC_PREVIEW);
    HBITMAP hBitmapCapture;
    FORMATRANGE fr;
    HDC hdc = GetDC(hwndPreview);

    fr.hdcTarget = make_dc();
    fr.rc = fr.rcPage = preview.rcPage;
    fr.rc.left += margins.left;
    fr.rc.top += margins.top;
    fr.rc.bottom -= margins.bottom;
    fr.rc.right -= margins.right;

    fr.chrg.cpMin = 0;
934
    fr.chrg.cpMax = preview.textlength;
935

936
    SetRect(&paper, 0, 0, preview.bmSize.cx, preview.bmSize.cy);
937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962

    if (!preview.hdc) {
        preview.hdc = CreateCompatibleDC(hdc);
        hBitmapCapture = CreateCompatibleBitmap(hdc, preview.bmSize.cx, preview.bmSize.cy);
        SelectObject(preview.hdc, hBitmapCapture);
    }

    fr.hdc = preview.hdc;
    draw_preview(hEditorWnd, &fr, &paper, preview.page);

    if(preview.pages_shown > 1)
    {
        if (!preview.hdc2)
        {
            preview.hdc2 = CreateCompatibleDC(hdc);
            hBitmapCapture = CreateCompatibleBitmap(hdc,
                                                    preview.bmSize.cx,
                                                    preview.bmSize.cy);
            SelectObject(preview.hdc2, hBitmapCapture);
        }

        fr.hdc = preview.hdc2;
        draw_preview(hEditorWnd, &fr, &fr.rcPage, preview.page + 1);
    }
    DeleteDC(fr.hdcTarget);
    ReleaseDC(hwndPreview, hdc);
963

964
    InvalidateRect(hwndPreview, NULL, FALSE);
965
    update_preview_buttons(hMainWnd);
966
    update_preview_statusbar(hMainWnd);
967 968 969 970 971 972 973
}

static void toggle_num_pages(HWND hMainWnd)
{
    HWND hReBar = GetDlgItem(hMainWnd, IDC_REBAR);
    WCHAR name[MAX_STRING_LEN];
    HINSTANCE hInst = GetModuleHandleW(0);
974
    int nPreviewPages;
975

976
    preview.pages_shown = preview.pages_shown > 1 ? 1 : 2;
977

978 979 980 981 982
    nPreviewPages = preview.zoomlevel > 0 ? preview.saved_pages_shown :
                                            preview.pages_shown;

    LoadStringW(hInst, nPreviewPages > 1 ? STRING_PREVIEW_ONEPAGE :
                                           STRING_PREVIEW_TWOPAGES,
983
                name, MAX_STRING_LEN);
984

985 986 987
    SetWindowTextW(GetDlgItem(hReBar, ID_PREVIEW_NUMPAGES), name);
    update_preview_sizes(GetDlgItem(hMainWnd, IDC_PREVIEW), TRUE);
    update_preview(hMainWnd);
988 989
}

990 991
/* Returns the page shown that the point is in (1 or 2) or 0 if the point
 * isn't inside either page */
992
static int preview_page_hittest(POINT pt)
993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007
{
    RECT rc;
    rc.left = preview.spacing.cx;
    rc.right = rc.left + preview.bmScaledSize.cx;
    rc.top = preview.spacing.cy;
    rc.bottom = rc.top + preview.bmScaledSize.cy;
    if (PtInRect(&rc, pt))
        return 1;

    if (preview.pages_shown <= 1)
        return 0;

    rc.left += preview.bmScaledSize.cx + preview.spacing.cx;
    rc.right += preview.bmScaledSize.cx + preview.spacing.cx;
    if (PtInRect(&rc, pt))
1008
        return is_last_preview_page(preview.page) ? 1 : 2;
1009 1010 1011 1012

    return 0;
}

1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
LRESULT CALLBACK preview_proc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch(msg)
    {
        case WM_CREATE:
        {
            HWND hMainWnd = GetParent(hWnd);
            HWND hEditorWnd = GetDlgItem(hMainWnd, IDC_EDITOR);
            FORMATRANGE fr;
            GETTEXTLENGTHEX gt = {GTL_DEFAULT, 1200};
            HDC hdc = GetDC(hWnd);
            HDC hdcTarget = make_dc();

            fr.rc = preview.rcPage = get_print_rect(hdcTarget);
            preview.rcPage.bottom += margins.bottom;
            preview.rcPage.right += margins.right;
            preview.rcPage.top = preview.rcPage.left = 0;
            fr.rcPage = preview.rcPage;

            preview.bmSize.cx = twips_to_pixels(preview.rcPage.right, GetDeviceCaps(hdc, LOGPIXELSX));
            preview.bmSize.cy = twips_to_pixels(preview.rcPage.bottom, GetDeviceCaps(hdc, LOGPIXELSY));

            preview.textlength = SendMessageW(hEditorWnd, EM_GETTEXTLENGTHEX, (WPARAM)&gt, 0);

            fr.hdc = CreateCompatibleDC(hdc);
            fr.hdcTarget = hdcTarget;
            fr.chrg.cpMin = 0;
            fr.chrg.cpMax = preview.textlength;
            DeleteDC(fr.hdc);
            DeleteDC(hdcTarget);
            ReleaseDC(hWnd, hdc);

            update_preview_sizes(hWnd, TRUE);
            update_preview(hMainWnd);
            break;
        }

        case WM_PAINT:
            return print_preview(hWnd);

        case WM_SIZE:
        {
            update_preview_sizes(hWnd, FALSE);
1056
            InvalidateRect(hWnd, NULL, FALSE);
1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110
            break;
        }

        case WM_VSCROLL:
        case WM_HSCROLL:
        {
            SCROLLINFO si;
            RECT rc;
            int nBar = (msg == WM_VSCROLL) ? SB_VERT : SB_HORZ;
            int origPos;

            GetClientRect(hWnd, &rc);
            si.cbSize = sizeof(si);
            si.fMask = SIF_ALL;
            GetScrollInfo(hWnd, nBar, &si);
            origPos = si.nPos;
            switch(LOWORD(wParam))
            {
                case SB_TOP: /* == SB_LEFT */
                    si.nPos = si.nMin;
                    break;
                case SB_BOTTOM: /* == SB_RIGHT */
                    si.nPos = si.nMax;
                    break;
                case SB_LINEUP: /* == SB_LINELEFT */
                    si.nPos -= si.nPage / 10;
                    break;
                case SB_LINEDOWN: /* == SB_LINERIGHT */
                    si.nPos += si.nPage / 10;
                    break;
                case SB_PAGEUP: /* == SB_PAGELEFT */
                    si.nPos -= si.nPage;
                    break;
                case SB_PAGEDOWN: /* SB_PAGERIGHT */
                    si.nPos += si.nPage;
                    break;
                case SB_THUMBTRACK:
                    si.nPos = si.nTrackPos;
                    break;
            }
            si.fMask = SIF_POS;
            SetScrollInfo(hWnd, nBar, &si, TRUE);
            GetScrollInfo(hWnd, nBar, &si);
            if (si.nPos != origPos)
            {
                int amount = origPos - si.nPos;
                if (msg == WM_VSCROLL)
                    ScrollWindow(hWnd, 0, amount, NULL, NULL);
                else
                    ScrollWindow(hWnd, amount, 0, NULL, NULL);
            }
            return 0;
        }

1111 1112 1113 1114
        case WM_SETCURSOR:
        {
            POINT pt;
            RECT rc;
1115
            int bHittest = 0;
1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
            DWORD messagePos = GetMessagePos();
            pt.x = (short)LOWORD(messagePos);
            pt.y = (short)HIWORD(messagePos);
            ScreenToClient(hWnd, &pt);

            GetClientRect(hWnd, &rc);
            if (PtInRect(&rc, pt))
            {
                pt.x += GetScrollPos(hWnd, SB_HORZ);
                pt.y += GetScrollPos(hWnd, SB_VERT);
                bHittest = preview_page_hittest(pt);
            }

            if (bHittest)
                SetCursor(LoadCursorW(GetModuleHandleW(0),
                                      MAKEINTRESOURCEW(IDC_ZOOM)));
            else
                SetCursor(LoadCursorW(NULL, (WCHAR*)IDC_ARROW));

            return TRUE;
        }

        case WM_LBUTTONDOWN:
        {
            int page;
            POINT pt;
            pt.x = (short)LOWORD(lParam) + GetScrollPos(hWnd, SB_HORZ);
            pt.y = (short)HIWORD(lParam) + GetScrollPos(hWnd, SB_VERT);
            if ((page = preview_page_hittest(pt)) > 0)
            {
                HWND hMainWnd = GetParent(hWnd);

                /* Convert point from client coordinate to unzoomed page
                 * coordinate. */
                pt.x -= preview.spacing.cx;
                if (page > 1)
                    pt.x -= preview.bmScaledSize.cx + preview.spacing.cx;
                pt.y -= preview.spacing.cy;
                pt.x /= preview.zoomratio;
                pt.y /= preview.zoomratio;

1157 1158
                if (preview.zoomlevel == 0)
                    preview.saved_pages_shown = preview.pages_shown;
1159 1160
                preview.zoomlevel = (preview.zoomlevel + 1) % 3;
                preview.zoomratio = 0;
1161
                if (preview.zoomlevel == 0 && preview.saved_pages_shown > 1)
1162
                {
1163 1164
                    toggle_num_pages(hMainWnd);
                } else if (preview.pages_shown > 1) {
1165 1166 1167 1168
                    if (page >= 2) preview.page++;
                    toggle_num_pages(hMainWnd);
                } else {
                    update_preview_sizes(hWnd, TRUE);
1169
                    InvalidateRect(hWnd, NULL, FALSE);
1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192
                    update_preview_buttons(hMainWnd);
                }

                if (preview.zoomlevel > 0) {
                    SCROLLINFO si;
                    /* Convert the coordinate back to client coordinate. */
                    pt.x *= preview.zoomratio;
                    pt.y *= preview.zoomratio;
                    pt.x += preview.spacing.cx;
                    pt.y += preview.spacing.cy;
                    /* Scroll to center view at that point on the page */
                    si.cbSize = sizeof(si);
                    si.fMask = SIF_PAGE;
                    GetScrollInfo(hWnd, SB_HORZ, &si);
                    pt.x -= si.nPage / 2;
                    SetScrollPos(hWnd, SB_HORZ, pt.x, TRUE);
                    GetScrollInfo(hWnd, SB_VERT, &si);
                    pt.y -= si.nPage / 2;
                    SetScrollPos(hWnd, SB_VERT, pt.y, TRUE);
                }
            }
        }

1193 1194 1195 1196 1197 1198 1199
        default:
            return DefWindowProcW(hWnd, msg, wParam, lParam);
    }

    return 0;
}

1200
LRESULT preview_command(HWND hWnd, WPARAM wParam)
1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215
{
    switch(LOWORD(wParam))
    {
        case ID_FILE_EXIT:
            PostMessageW(hWnd, WM_CLOSE, 0, 0);
            break;

        case ID_PREVIEW_NEXTPAGE:
        case ID_PREVIEW_PREVPAGE:
        {
            if(LOWORD(wParam) == ID_PREVIEW_NEXTPAGE)
                preview.page++;
            else
                preview.page--;

1216 1217 1218 1219 1220
            update_preview(hWnd);
        }
        break;

        case ID_PREVIEW_NUMPAGES:
1221 1222
            toggle_num_pages(hWnd);
            break;
1223

1224 1225
        case ID_PREVIEW_ZOOMIN:
            if (preview.zoomlevel < 2)
1226
            {
1227 1228
                if (preview.zoomlevel == 0)
                    preview.saved_pages_shown = preview.pages_shown;
1229 1230
                preview.zoomlevel++;
                preview.zoomratio = 0;
1231
                if (preview.pages_shown > 1)
1232 1233 1234 1235 1236 1237
                {
                    /* Forced switch to one page when zooming in. */
                    toggle_num_pages(hWnd);
                } else {
                    HWND hwndPreview = GetDlgItem(hWnd, IDC_PREVIEW);
                    update_preview_sizes(hwndPreview, TRUE);
1238
                    InvalidateRect(hwndPreview, NULL, FALSE);
1239 1240
                    update_preview_buttons(hWnd);
                }
1241
            }
1242
            break;
1243

1244 1245 1246 1247 1248 1249
        case ID_PREVIEW_ZOOMOUT:
            if (preview.zoomlevel > 0)
            {
                HWND hwndPreview = GetDlgItem(hWnd, IDC_PREVIEW);
                preview.zoomlevel--;
                preview.zoomratio = 0;
1250 1251 1252 1253
                if (preview.zoomlevel == 0 && preview.saved_pages_shown > 1) {
                    toggle_num_pages(hWnd);
                } else {
                    update_preview_sizes(hwndPreview, TRUE);
1254
                    InvalidateRect(hwndPreview, NULL, FALSE);
1255 1256
                    update_preview_buttons(hWnd);
                }
1257 1258
            }
            break;
1259 1260 1261 1262 1263 1264 1265 1266 1267

        case ID_PRINT:
            dialog_print(hWnd, preview.wszFileName);
            SendMessageW(hWnd, WM_CLOSE, 0, 0);
            break;
    }

    return 0;
}