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- /*
- Simple DirectMedia Layer
- Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
- This software is provided 'as-is', without any express or implied
- warranty. In no event will the authors be held liable for any damages
- arising from the use of this software.
- Permission is granted to anyone to use this software for any purpose,
- including commercial applications, and to alter it and redistribute it
- freely, subject to the following restrictions:
- 1. The origin of this software must not be misrepresented; you must not
- claim that you wrote the original software. If you use this software
- in a product, an acknowledgment in the product documentation would be
- appreciated but is not required.
- 2. Altered source versions must be plainly marked as such, and must not be
- misrepresented as being the original software.
- 3. This notice may not be removed or altered from any source distribution.
- */
- #include "../../SDL_internal.h"
- #if SDL_VIDEO_DRIVER_WINDOWS
- #include "../../core/windows/SDL_windows.h"
- #include "SDL_assert.h"
- #include "SDL_windowsvideo.h"
- #ifndef SS_EDITCONTROL
- #define SS_EDITCONTROL 0x2000
- #endif
- /* Display a Windows message box */
- #pragma pack(push, 1)
- typedef struct
- {
- WORD dlgVer;
- WORD signature;
- DWORD helpID;
- DWORD exStyle;
- DWORD style;
- WORD cDlgItems;
- short x;
- short y;
- short cx;
- short cy;
- } DLGTEMPLATEEX;
- typedef struct
- {
- DWORD helpID;
- DWORD exStyle;
- DWORD style;
- short x;
- short y;
- short cx;
- short cy;
- DWORD id;
- } DLGITEMTEMPLATEEX;
- #pragma pack(pop)
- typedef struct
- {
- DLGTEMPLATEEX* lpDialog;
- Uint8 *data;
- size_t size;
- size_t used;
- } WIN_DialogData;
- static INT_PTR MessageBoxDialogProc(HWND hDlg, UINT iMessage, WPARAM wParam, LPARAM lParam)
- {
- switch ( iMessage ) {
- case WM_COMMAND:
- /* Return the ID of the button that was pushed */
- EndDialog(hDlg, LOWORD(wParam));
- return TRUE;
- default:
- break;
- }
- return FALSE;
- }
- static SDL_bool ExpandDialogSpace(WIN_DialogData *dialog, size_t space)
- {
- size_t size = dialog->size;
- if (size == 0) {
- size = space;
- } else {
- while ((dialog->used + space) > size) {
- size *= 2;
- }
- }
- if (size > dialog->size) {
- void *data = SDL_realloc(dialog->data, size);
- if (!data) {
- SDL_OutOfMemory();
- return SDL_FALSE;
- }
- dialog->data = data;
- dialog->size = size;
- dialog->lpDialog = (DLGTEMPLATEEX*)dialog->data;
- }
- return SDL_TRUE;
- }
- static SDL_bool AlignDialogData(WIN_DialogData *dialog, size_t size)
- {
- size_t padding = (dialog->used % size);
- if (!ExpandDialogSpace(dialog, padding)) {
- return SDL_FALSE;
- }
- dialog->used += padding;
- return SDL_TRUE;
- }
- static SDL_bool AddDialogData(WIN_DialogData *dialog, const void *data, size_t size)
- {
- if (!ExpandDialogSpace(dialog, size)) {
- return SDL_FALSE;
- }
- SDL_memcpy(dialog->data+dialog->used, data, size);
- dialog->used += size;
- return SDL_TRUE;
- }
- static SDL_bool AddDialogString(WIN_DialogData *dialog, const char *string)
- {
- WCHAR *wstring;
- WCHAR *p;
- size_t count;
- SDL_bool status;
- if (!string) {
- string = "";
- }
- wstring = WIN_UTF8ToString(string);
- if (!wstring) {
- return SDL_FALSE;
- }
- /* Find out how many characters we have, including null terminator */
- count = 0;
- for (p = wstring; *p; ++p) {
- ++count;
- }
- ++count;
- status = AddDialogData(dialog, wstring, count*sizeof(WCHAR));
- SDL_free(wstring);
- return status;
- }
- static int s_BaseUnitsX;
- static int s_BaseUnitsY;
- static void Vec2ToDLU(short *x, short *y)
- {
- SDL_assert(s_BaseUnitsX != 0); /* we init in WIN_ShowMessageBox(), which is the only public function... */
- *x = MulDiv(*x, 4, s_BaseUnitsX);
- *y = MulDiv(*y, 8, s_BaseUnitsY);
- }
- 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)
- {
- DLGITEMTEMPLATEEX item;
- WORD marker = 0xFFFF;
- WORD extraData = 0;
- SDL_zero(item);
- item.style = style;
- item.exStyle = exStyle;
- item.x = x;
- item.y = y;
- item.cx = w;
- item.cy = h;
- item.id = id;
- Vec2ToDLU(&item.x, &item.y);
- Vec2ToDLU(&item.cx, &item.cy);
- if (!AlignDialogData(dialog, sizeof(DWORD))) {
- return SDL_FALSE;
- }
- if (!AddDialogData(dialog, &item, sizeof(item))) {
- return SDL_FALSE;
- }
- if (!AddDialogData(dialog, &marker, sizeof(marker))) {
- return SDL_FALSE;
- }
- if (!AddDialogData(dialog, &type, sizeof(type))) {
- return SDL_FALSE;
- }
- if (!AddDialogString(dialog, caption)) {
- return SDL_FALSE;
- }
- if (!AddDialogData(dialog, &extraData, sizeof(extraData))) {
- return SDL_FALSE;
- }
- ++dialog->lpDialog->cDlgItems;
- return SDL_TRUE;
- }
- static SDL_bool AddDialogStatic(WIN_DialogData *dialog, int x, int y, int w, int h, const char *text)
- {
- DWORD style = WS_VISIBLE | WS_CHILD | SS_LEFT | SS_NOPREFIX | SS_EDITCONTROL;
- return AddDialogControl(dialog, 0x0082, style, 0, x, y, w, h, -1, text);
- }
- static SDL_bool AddDialogButton(WIN_DialogData *dialog, int x, int y, int w, int h, const char *text, int id, SDL_bool isDefault)
- {
- DWORD style = WS_VISIBLE | WS_CHILD;
- if (isDefault) {
- style |= BS_DEFPUSHBUTTON;
- } else {
- style |= BS_PUSHBUTTON;
- }
- return AddDialogControl(dialog, 0x0080, style, 0, x, y, w, h, id, text);
- }
- static void FreeDialogData(WIN_DialogData *dialog)
- {
- SDL_free(dialog->data);
- SDL_free(dialog);
- }
- static WIN_DialogData *CreateDialogData(int w, int h, const char *caption)
- {
- WIN_DialogData *dialog;
- DLGTEMPLATEEX dialogTemplate;
- WORD WordToPass;
- SDL_zero(dialogTemplate);
- dialogTemplate.dlgVer = 1;
- dialogTemplate.signature = 0xffff;
- dialogTemplate.style = (WS_CAPTION | DS_CENTER | DS_SHELLFONT);
- dialogTemplate.x = 0;
- dialogTemplate.y = 0;
- dialogTemplate.cx = w;
- dialogTemplate.cy = h;
- Vec2ToDLU(&dialogTemplate.cx, &dialogTemplate.cy);
- dialog = (WIN_DialogData *)SDL_calloc(1, sizeof(*dialog));
- if (!dialog) {
- return NULL;
- }
- if (!AddDialogData(dialog, &dialogTemplate, sizeof(dialogTemplate))) {
- FreeDialogData(dialog);
- return NULL;
- }
- /* No menu */
- WordToPass = 0;
- if (!AddDialogData(dialog, &WordToPass, 2)) {
- FreeDialogData(dialog);
- return NULL;
- }
- /* No custom class */
- if (!AddDialogData(dialog, &WordToPass, 2)) {
- FreeDialogData(dialog);
- return NULL;
- }
- /* title */
- if (!AddDialogString(dialog, caption)) {
- FreeDialogData(dialog);
- return NULL;
- }
- /* Font stuff */
- {
- /*
- * We want to use the system messagebox font.
- */
- BYTE ToPass;
- NONCLIENTMETRICSA NCM;
- NCM.cbSize = sizeof(NCM);
- SystemParametersInfoA(SPI_GETNONCLIENTMETRICS, 0, &NCM, 0);
- /* Font size - convert to logical font size for dialog parameter. */
- {
- HDC ScreenDC = GetDC(0);
- WordToPass = (WORD)(-72 * NCM.lfMessageFont.lfHeight / GetDeviceCaps(ScreenDC, LOGPIXELSY));
- ReleaseDC(0, ScreenDC);
- }
- if (!AddDialogData(dialog, &WordToPass, 2)) {
- FreeDialogData(dialog);
- return NULL;
- }
- /* Font weight */
- WordToPass = (WORD)NCM.lfMessageFont.lfWeight;
- if (!AddDialogData(dialog, &WordToPass, 2)) {
- FreeDialogData(dialog);
- return NULL;
- }
- /* italic? */
- ToPass = NCM.lfMessageFont.lfItalic;
- if (!AddDialogData(dialog, &ToPass, 1)) {
- FreeDialogData(dialog);
- return NULL;
- }
- /* charset? */
- ToPass = NCM.lfMessageFont.lfCharSet;
- if (!AddDialogData(dialog, &ToPass, 1)) {
- FreeDialogData(dialog);
- return NULL;
- }
- /* font typeface. */
- if (!AddDialogString(dialog, NCM.lfMessageFont.lfFaceName)) {
- FreeDialogData(dialog);
- return NULL;
- }
- }
- return dialog;
- }
- int
- WIN_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
- {
- WIN_DialogData *dialog;
- int i, x, y;
- UINT_PTR which;
- const SDL_MessageBoxButtonData *buttons = messageboxdata->buttons;
- HFONT DialogFont;
- SIZE Size;
- RECT TextSize;
- wchar_t* wmessage;
- TEXTMETRIC TM;
- const int ButtonWidth = 88;
- const int ButtonHeight = 26;
- const int TextMargin = 16;
- const int ButtonMargin = 12;
- /* Jan 25th, 2013 - dant@fleetsa.com
- *
- *
- * I've tried to make this more reasonable, but I've run in to a lot
- * of nonsense.
- *
- * The original issue is the code was written in pixels and not
- * dialog units (DLUs). All DialogBox functions use DLUs, which
- * vary based on the selected font (yay).
- *
- * According to MSDN, the most reliable way to convert is via
- * MapDialogUnits, which requires an HWND, which we don't have
- * at time of template creation.
- *
- * We do however have:
- * The system font (DLU width 8 for me)
- * The font we select for the dialog (DLU width 6 for me)
- *
- * Based on experimentation, *neither* of these return the value
- * actually used. Stepping in to MapDialogUnits(), the conversion
- * is fairly clear, and uses 7 for me.
- *
- * As a result, some of this is hacky to ensure the sizing is
- * somewhat correct.
- *
- * Honestly, a long term solution is to use CreateWindow, not CreateDialog.
- *
- *
- * In order to get text dimensions we need to have a DC with the desired font.
- * I'm assuming a dialog box in SDL is rare enough we can to the create.
- */
- HDC FontDC = CreateCompatibleDC(0);
- {
- /* Create a duplicate of the font used in system message boxes. */
- LOGFONT lf;
- NONCLIENTMETRICS NCM;
- NCM.cbSize = sizeof(NCM);
- SystemParametersInfo(SPI_GETNONCLIENTMETRICS, 0, &NCM, 0);
- lf = NCM.lfMessageFont;
- DialogFont = CreateFontIndirect(&lf);
- }
- /* Select the font in to our DC */
- SelectObject(FontDC, DialogFont);
- {
- /* Get the metrics to try and figure our DLU conversion. */
- GetTextMetrics(FontDC, &TM);
- s_BaseUnitsX = TM.tmAveCharWidth + 1;
- s_BaseUnitsY = TM.tmHeight;
- }
- /* Measure the *pixel* size of the string. */
- wmessage = WIN_UTF8ToString(messageboxdata->message);
- SDL_zero(TextSize);
- Size.cx = DrawText(FontDC, wmessage, -1, &TextSize, DT_CALCRECT);
- /* Add some padding for hangs, etc. */
- TextSize.right += 2;
- TextSize.bottom += 2;
- /* Done with the DC, and the string */
- DeleteDC(FontDC);
- SDL_free(wmessage);
- /* Increase the size of the dialog by some border spacing around the text. */
- Size.cx = TextSize.right - TextSize.left;
- Size.cy = TextSize.bottom - TextSize.top;
- Size.cx += TextMargin * 2;
- Size.cy += TextMargin * 2;
- /* Ensure the size is wide enough for all of the buttons. */
- if (Size.cx < messageboxdata->numbuttons * (ButtonWidth + ButtonMargin) + ButtonMargin)
- Size.cx = messageboxdata->numbuttons * (ButtonWidth + ButtonMargin) + ButtonMargin;
- /* Add vertical space for the buttons and border. */
- Size.cy += ButtonHeight + TextMargin;
- dialog = CreateDialogData(Size.cx, Size.cy, messageboxdata->title);
- if (!dialog) {
- return -1;
- }
- if (!AddDialogStatic(dialog, TextMargin, TextMargin, TextSize.right - TextSize.left, TextSize.bottom - TextSize.top, messageboxdata->message)) {
- FreeDialogData(dialog);
- return -1;
- }
- /* Align the buttons to the right/bottom. */
- x = Size.cx - ButtonWidth - ButtonMargin;
- y = Size.cy - ButtonHeight - ButtonMargin;
- for (i = 0; i < messageboxdata->numbuttons; ++i) {
- SDL_bool isDefault;
- if (buttons[i].flags & SDL_MESSAGEBOX_BUTTON_RETURNKEY_DEFAULT) {
- isDefault = SDL_TRUE;
- } else {
- isDefault = SDL_FALSE;
- }
- if (!AddDialogButton(dialog, x, y, ButtonWidth, ButtonHeight, buttons[i].text, i, isDefault)) {
- FreeDialogData(dialog);
- return -1;
- }
- x -= ButtonWidth + ButtonMargin;
- }
- /* FIXME: If we have a parent window, get the Instance and HWND for them */
- which = DialogBoxIndirect(NULL, (DLGTEMPLATE*)dialog->lpDialog, NULL, (DLGPROC)MessageBoxDialogProc);
- *buttonid = buttons[which].buttonid;
- FreeDialogData(dialog);
- return 0;
- }
- #endif /* SDL_VIDEO_DRIVER_WINDOWS */
- /* vi: set ts=4 sw=4 expandtab: */
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