src/video/windows/SDL_windowsmessagebox.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 29 Aug 2013 08:29:21 -0700
changeset 7719 31b5f9ff36ca
parent 7191 75360622e65f
child 7828 1451063c8ecd
permissions -rw-r--r--
Christoph Mallon: Remove pointless if (x) before SDL_free(x)
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#if SDL_VIDEO_DRIVER_WINDOWS
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#include "SDL.h"
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#include "SDL_windowsvideo.h"
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#ifndef SS_EDITCONTROL
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#define SS_EDITCONTROL  0x2000
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#endif
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/* Display a Windows message box */
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#pragma pack(push, 1)
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typedef struct
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{
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    WORD dlgVer;
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    WORD signature;
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    DWORD helpID;
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    DWORD exStyle;
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    DWORD style;
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    WORD cDlgItems;
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    short x;
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    short y;
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    short cx;
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    short cy;
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} DLGTEMPLATEEX;
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typedef struct
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{
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    DWORD helpID;
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    DWORD exStyle;
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    DWORD style;
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    short x;
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    short y;
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    short cx;
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    short cy;
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    DWORD id;
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} DLGITEMTEMPLATEEX;
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#pragma pack(pop)
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typedef struct
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{
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    DLGTEMPLATEEX* lpDialog;
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    Uint8 *data;
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    size_t size;
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    size_t used;
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} WIN_DialogData;
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static INT_PTR MessageBoxDialogProc(HWND hDlg, UINT iMessage, WPARAM wParam, LPARAM lParam)
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{
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    switch ( iMessage ) {
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    case WM_COMMAND:
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        /* Return the ID of the button that was pushed */
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        EndDialog(hDlg, LOWORD(wParam));
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        return TRUE;
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    default:
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        break;
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    }
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    return FALSE;
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}
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static SDL_bool ExpandDialogSpace(WIN_DialogData *dialog, size_t space)
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{
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    size_t size = dialog->size;
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    if (size == 0) {
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        size = space;
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    } else {
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        while ((dialog->used + space) > size) {
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            size *= 2;
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        }
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    }
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    if (size > dialog->size) {
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        void *data = SDL_realloc(dialog->data, size);
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        if (!data) {
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            SDL_OutOfMemory();
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            return SDL_FALSE;
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        }
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        dialog->data = data;
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        dialog->size = size;
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        dialog->lpDialog = (DLGTEMPLATEEX*)dialog->data;
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    }
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    return SDL_TRUE;
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}
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static SDL_bool AlignDialogData(WIN_DialogData *dialog, size_t size)
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{
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    size_t padding = (dialog->used % size);
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    if (!ExpandDialogSpace(dialog, padding)) {
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        return SDL_FALSE;
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    }
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    dialog->used += padding;
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    return SDL_TRUE;
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}
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static SDL_bool AddDialogData(WIN_DialogData *dialog, const void *data, size_t size)
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{
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    if (!ExpandDialogSpace(dialog, size)) {
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        return SDL_FALSE;
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    }
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    SDL_memcpy(dialog->data+dialog->used, data, size);
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    dialog->used += size;
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    return SDL_TRUE;
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}
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static SDL_bool AddDialogString(WIN_DialogData *dialog, const char *string)
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{
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    WCHAR *wstring;
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    WCHAR *p;
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    size_t count;
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    SDL_bool status;
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    if (!string) {
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        string = "";
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    }
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    wstring = WIN_UTF8ToString(string);
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    if (!wstring) {
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        return SDL_FALSE;
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    }
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    /* Find out how many characters we have, including null terminator */
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    count = 0;
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    for (p = wstring; *p; ++p) {
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        ++count;
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    }
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    ++count;
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    status = AddDialogData(dialog, wstring, count*sizeof(WCHAR));
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    SDL_free(wstring);
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    return status;
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}
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static int s_BaseUnitsX;
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static int s_BaseUnitsY;
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static void Vec2ToDLU(short *x, short *y)
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{
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    SDL_assert(s_BaseUnitsX != 0); /* we init in WIN_ShowMessageBox(), which is the only public function... */
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    *x = MulDiv(*x, 4, s_BaseUnitsX);
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    *y = MulDiv(*y, 8, s_BaseUnitsY);
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}
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static SDL_bool AddDialogControl(WIN_DialogData *dialog, WORD type, DWORD style, DWORD exStyle, int x, int y, int w, int h, int id, const char *caption)
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{
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    DLGITEMTEMPLATEEX item;
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    WORD marker = 0xFFFF;
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    WORD extraData = 0;
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    SDL_zero(item);
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    item.style = style;
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    item.exStyle = exStyle;
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    item.x = x;
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    item.y = y;
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    item.cx = w;
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    item.cy = h;
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    item.id = id;
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    Vec2ToDLU(&item.x, &item.y);
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    Vec2ToDLU(&item.cx, &item.cy);
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    if (!AlignDialogData(dialog, sizeof(DWORD))) {
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        return SDL_FALSE;
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    }
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    if (!AddDialogData(dialog, &item, sizeof(item))) {
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        return SDL_FALSE;
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    }
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    if (!AddDialogData(dialog, &marker, sizeof(marker))) {
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        return SDL_FALSE;
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    }
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    if (!AddDialogData(dialog, &type, sizeof(type))) {
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        return SDL_FALSE;
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    }
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    if (!AddDialogString(dialog, caption)) {
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        return SDL_FALSE;
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    }
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    if (!AddDialogData(dialog, &extraData, sizeof(extraData))) {
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        return SDL_FALSE;
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    }
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    ++dialog->lpDialog->cDlgItems;
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    return SDL_TRUE;
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}
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static SDL_bool AddDialogStatic(WIN_DialogData *dialog, int x, int y, int w, int h, const char *text)
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{
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    DWORD style = WS_VISIBLE | WS_CHILD | SS_LEFT | SS_NOPREFIX | SS_EDITCONTROL;
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    return AddDialogControl(dialog, 0x0082, style, 0, x, y, w, h, -1, text);
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}
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static SDL_bool AddDialogButton(WIN_DialogData *dialog, int x, int y, int w, int h, const char *text, int id, SDL_bool isDefault)
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{
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    DWORD style = WS_VISIBLE | WS_CHILD;
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    if (isDefault) {
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        style |= BS_DEFPUSHBUTTON;
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    } else {
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        style |= BS_PUSHBUTTON;
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    }
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    return AddDialogControl(dialog, 0x0080, style, 0, x, y, w, h, id, text);
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}
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static void FreeDialogData(WIN_DialogData *dialog)
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{
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    SDL_free(dialog->data);
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    SDL_free(dialog);
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}
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static WIN_DialogData *CreateDialogData(int w, int h, const char *caption)
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{
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    WIN_DialogData *dialog;
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    DLGTEMPLATEEX dialogTemplate;
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    WORD WordToPass;
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    SDL_zero(dialogTemplate);
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    dialogTemplate.dlgVer = 1;
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    dialogTemplate.signature = 0xffff;
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    dialogTemplate.style = (WS_CAPTION | DS_CENTER | DS_SHELLFONT);
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    dialogTemplate.x = 0;
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    dialogTemplate.y = 0;
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    dialogTemplate.cx = w;
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    dialogTemplate.cy = h;
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    Vec2ToDLU(&dialogTemplate.cx, &dialogTemplate.cy);
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    dialog = (WIN_DialogData *)SDL_calloc(1, sizeof(*dialog));
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    if (!dialog) {
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        return NULL;
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    }
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    if (!AddDialogData(dialog, &dialogTemplate, sizeof(dialogTemplate))) {
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        FreeDialogData(dialog);
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        return NULL;
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    }
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    /* No menu */
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    WordToPass = 0;
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    if (!AddDialogData(dialog, &WordToPass, 2)) {
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        FreeDialogData(dialog);
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        return NULL;
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    }
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    /* No custom class */
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    if (!AddDialogData(dialog, &WordToPass, 2)) {
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        FreeDialogData(dialog);
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        return NULL;
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    }
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    /* title */
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    if (!AddDialogString(dialog, caption)) {
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        FreeDialogData(dialog);
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        return NULL;
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    }
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    /* Font stuff */
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    {
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        /*
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         * We want to use the system messagebox font.
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         */
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        BYTE ToPass;
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        NONCLIENTMETRICSA NCM;
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        NCM.cbSize = sizeof(NCM);
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        SystemParametersInfoA(SPI_GETNONCLIENTMETRICS, 0, &NCM, 0);
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        /* Font size - convert to logical font size for dialog parameter. */
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        {
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            HDC ScreenDC = GetDC(0);
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            WordToPass = (WORD)(-72 * NCM.lfMessageFont.lfHeight / GetDeviceCaps(ScreenDC, LOGPIXELSY));
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            ReleaseDC(0, ScreenDC);
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        }
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        if (!AddDialogData(dialog, &WordToPass, 2)) {
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            FreeDialogData(dialog);
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            return NULL;
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        }
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        /* Font weight */
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        WordToPass = (WORD)NCM.lfMessageFont.lfWeight;
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        if (!AddDialogData(dialog, &WordToPass, 2)) {
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            FreeDialogData(dialog);
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            return NULL;
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        }
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        /* italic? */
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        ToPass = NCM.lfMessageFont.lfItalic;
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        if (!AddDialogData(dialog, &ToPass, 1)) {
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            FreeDialogData(dialog);
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            return NULL;
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        }
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        /* charset? */
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        ToPass = NCM.lfMessageFont.lfCharSet;
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        if (!AddDialogData(dialog, &ToPass, 1)) {
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            FreeDialogData(dialog);
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            return NULL;
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        }
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        /* font typeface. */
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        if (!AddDialogString(dialog, NCM.lfMessageFont.lfFaceName)) {
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            FreeDialogData(dialog);
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            return NULL;
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        }
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    }
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    return dialog;
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}
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int
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WIN_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
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{
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    WIN_DialogData *dialog;
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    int i, x, y, which;
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    const SDL_MessageBoxButtonData *buttons = messageboxdata->buttons;
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    HFONT DialogFont;
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    SIZE Size;
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    RECT TextSize;
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    wchar_t* wmessage;
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    TEXTMETRIC TM;
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    const int ButtonWidth = 88;
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    const int ButtonHeight = 26;
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    const int TextMargin = 16;
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    const int ButtonMargin = 12;
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    /* Jan 25th, 2013 - dant@fleetsa.com
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     *
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     *
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     * I've tried to make this more reasonable, but I've run in to a lot
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     * of nonsense.
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     *
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     * The original issue is the code was written in pixels and not
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     * dialog units (DLUs). All DialogBox functions use DLUs, which
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     * vary based on the selected font (yay).
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     *
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     * According to MSDN, the most reliable way to convert is via
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     * MapDialogUnits, which requires an HWND, which we don't have
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     * at time of template creation.
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     *
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     * We do however have:
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     *  The system font (DLU width 8 for me)
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     *  The font we select for the dialog (DLU width 6 for me)
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     *
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     * Based on experimentation, *neither* of these return the value
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     * actually used. Stepping in to MapDialogUnits(), the conversion
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     * is fairly clear, and uses 7 for me.
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     *
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     * As a result, some of this is hacky to ensure the sizing is
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     * somewhat correct.
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     *
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     * Honestly, a long term solution is to use CreateWindow, not CreateDialog.
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     *
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     *
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     * In order to get text dimensions we need to have a DC with the desired font.
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     * I'm assuming a dialog box in SDL is rare enough we can to the create.
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   389
     */
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   390
    HDC FontDC = CreateCompatibleDC(0);
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   391
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   392
    {
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   393
        /* Create a duplicate of the font used in system message boxes. */
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   394
        LOGFONT lf;
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   395
        NONCLIENTMETRICS NCM;
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   396
        NCM.cbSize = sizeof(NCM);
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        SystemParametersInfo(SPI_GETNONCLIENTMETRICS, 0, &NCM, 0);
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        lf = NCM.lfMessageFont;
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        DialogFont = CreateFontIndirect(&lf);
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   400
    }
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   401
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   402
    /* Select the font in to our DC */
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   403
    SelectObject(FontDC, DialogFont);
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   404
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   405
    {
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   406
        /* Get the metrics to try and figure our DLU conversion. */
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   407
        GetTextMetrics(FontDC, &TM);
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   408
        s_BaseUnitsX = TM.tmAveCharWidth + 1;
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   409
        s_BaseUnitsY = TM.tmHeight;
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   410
    }
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   411
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   412
    /* Measure the *pixel* size of the string. */
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   413
    wmessage = WIN_UTF8ToString(messageboxdata->message);
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   414
    SDL_zero(TextSize);
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    Size.cx = DrawText(FontDC, wmessage, -1, &TextSize, DT_CALCRECT);
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   416
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   417
    /* Add some padding for hangs, etc. */
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   418
    TextSize.right += 2;
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   419
    TextSize.bottom += 2;
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   420
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   421
    /* Done with the DC, and the string */
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   422
    DeleteDC(FontDC);
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   423
    SDL_free(wmessage);
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   424
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   425
    /* Increase the size of the dialog by some border spacing around the text. */
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   426
    Size.cx = TextSize.right - TextSize.left;
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   427
    Size.cy = TextSize.bottom - TextSize.top;
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   428
    Size.cx += TextMargin * 2;
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   429
    Size.cy += TextMargin * 2;
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   430
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   431
    /* Ensure the size is wide enough for all of the buttons. */
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   432
    if (Size.cx < messageboxdata->numbuttons * (ButtonWidth + ButtonMargin) + ButtonMargin)
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   433
        Size.cx = messageboxdata->numbuttons * (ButtonWidth + ButtonMargin) + ButtonMargin;
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   434
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   435
    /* Add vertical space for the buttons and border. */
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   436
    Size.cy += ButtonHeight + TextMargin;
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   437
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   438
    dialog = CreateDialogData(Size.cx, Size.cy, messageboxdata->title);
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   439
    if (!dialog) {
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   440
        return -1;
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   441
    }
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   442
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   443
    if (!AddDialogStatic(dialog, TextMargin, TextMargin, TextSize.right - TextSize.left, TextSize.bottom - TextSize.top, messageboxdata->message)) {
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   444
        FreeDialogData(dialog);
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   445
        return -1;
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   446
    }
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   447
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   448
    /* Align the buttons to the right/bottom. */
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   449
    x = Size.cx - ButtonWidth - ButtonMargin;
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   450
    y = Size.cy - ButtonHeight - ButtonMargin;
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   451
    for (i = 0; i < messageboxdata->numbuttons; ++i) {
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   452
        SDL_bool isDefault;
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   453
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   454
        if (buttons[i].flags & SDL_MESSAGEBOX_BUTTON_RETURNKEY_DEFAULT) {
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   455
            isDefault = SDL_TRUE;
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   456
        } else {
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   457
            isDefault = SDL_FALSE;
slouken@6620
   458
        }
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   459
        if (!AddDialogButton(dialog, x, y, ButtonWidth, ButtonHeight, buttons[i].text, i, isDefault)) {
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   460
            FreeDialogData(dialog);
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   461
            return -1;
slouken@6620
   462
        }
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   463
        x -= ButtonWidth + ButtonMargin;
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   464
    }
slouken@6620
   465
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   466
    /* FIXME: If we have a parent window, get the Instance and HWND for them */
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   467
    which = DialogBoxIndirect(NULL, (DLGTEMPLATE*)dialog->lpDialog, NULL, (DLGPROC)MessageBoxDialogProc);
slouken@6620
   468
    *buttonid = buttons[which].buttonid;
slouken@6620
   469
slouken@6620
   470
    FreeDialogData(dialog);
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   471
    return 0;
slouken@6620
   472
}
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   473
slouken@6620
   474
#endif /* SDL_VIDEO_DRIVER_WINDOWS */
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   476
/* vi: set ts=4 sw=4 expandtab: */