/****************************************************
Set dialog DPI helper class
Copyright (C)2003 by George Yohng
http://www.yohng.com
LICENSE AGREEMENT:
You agree to go to http://www.yohng.com/music.html
and listen completely (without skips) to the very
first track on the list.
****************************************************/
#include <stdafx.h>
#include <windows.h>
#include "setdpi.h"
class helper
{
public:
// Constants used in DLGINIT resources for OLE control containers
// NOTE: These are NOT real Windows messages they are simply tags
// used in the control resource and are never used as 'messages'
enum
{
ATL_WM_OCC_LOADFROMSTREAM = 0x0376,
ATL_WM_OCC_LOADFROMSTORAGE = 0x0377,
ATL_WM_OCC_INITNEW = 0x0378,
ATL_WM_OCC_LOADFROMSTREAM_EX = 0x037A,
ATL_WM_OCC_LOADFROMSTORAGE_EX = 0x037B,
ATL_DISPID_DATASOURCE = 0x80010001,
ATL_DISPID_DATAFIELD = 0x80010002,
};
//local struct used for implementation
#pragma pack(push, 1)
struct DLGINITSTRUCT
{
WORD nIDC;
WORD message;
DWORD dwSize;
};
struct DLGTEMPLATEEX
{
WORD dlgVer;
WORD signature;
DWORD helpID;
DWORD exStyle;
DWORD style;
WORD cDlgItems;
short x;
short y;
short cx;
short cy;
// Everything else in this structure is variable length,
// and therefore must be determined dynamically
// sz_Or_Ord menu; // name or ordinal of a menu resource
// sz_Or_Ord windowClass; // name or ordinal of a window class
// WCHAR title[titleLen]; // title string of the dialog box
// short pointsize; // only if DS_SETFONT is set
// short weight; // only if DS_SETFONT is set
// short bItalic; // only if DS_SETFONT is set
// WCHAR font[fontLen]; // typeface name, if DS_SETFONT is set
};
struct DLGITEMTEMPLATEEX
{
DWORD helpID;
DWORD exStyle;
DWORD style;
short x;
short y;
short cx;
short cy;
DWORD id;
// Everything else in this structure is variable length,
// and therefore must be determined dynamically
// sz_Or_Ord windowClass; // name or ordinal of a window class
// sz_Or_Ord title; // title string or ordinal of a resource
// WORD extraCount; // bytes following creation data
};
#pragma pack(pop)
static BOOL IsDialogEx(const DLGTEMPLATE* pTemplate)
{
return ((DLGTEMPLATEEX*)pTemplate)->signature == 0xFFFF;
}
inline static WORD& DlgTemplateItemCount(DLGTEMPLATE* pTemplate)
{
if (IsDialogEx(pTemplate))
return reinterpret_cast<DLGTEMPLATEEX*>(pTemplate)->cDlgItems;
else
return pTemplate->cdit;
}
inline static const WORD& DlgTemplateItemCount(const DLGTEMPLATE* pTemplate)
{
if (IsDialogEx(pTemplate))
return reinterpret_cast<const DLGTEMPLATEEX*>(pTemplate)->cDlgItems;
else
return pTemplate->cdit;
}
static DLGITEMTEMPLATE* FindFirstDlgItem(const DLGTEMPLATE* pTemplate)
{
BOOL bDialogEx = IsDialogEx(pTemplate);
WORD* pw;
DWORD dwStyle;
if (bDialogEx)
{
pw = (WORD*)((DLGTEMPLATEEX*)pTemplate + 1);
dwStyle = ((DLGTEMPLATEEX*)pTemplate)->style;
}
else
{
pw = (WORD*)(pTemplate + 1);
dwStyle = pTemplate->style;
}
// Check for presence of menu and skip it if there is one
// 0x0000 means there is no menu
// 0xFFFF means there is a menu ID following
// Everything else means that this is a NULL terminated Unicode string
// which identifies the menu resource
if (*pw == 0xFFFF)
pw += 2; // Has menu ID, so skip 2 words
else
while (*pw++); // Either No menu, or string, skip past terminating NULL
// Check for presence of class name string
// 0x0000 means "Use system dialog class name"
// 0xFFFF means there is a window class (atom) specified
// Everything else means that this is a NULL terminated Unicode string
// which identifies the menu resource
if (*pw == 0xFFFF)
pw += 2; // Has class atom, so skip 2 words
else
while (*pw++); // Either No class, or string, skip past terminating NULL
// Skip caption string
while (*pw++);
// If we have DS_SETFONT, there is extra font information which we must now skip
if (dwStyle & DS_SETFONT)
{
// If it is a regular DLGTEMPLATE there is only a short for the point size
// and a string specifying the font (typefacename). If this is a DLGTEMPLATEEX
// then there is also the font weight, and bItalic which must be skipped
if (bDialogEx)
pw += 3; // Skip font size, weight, (italic, charset)
else
pw += 1; // Skip font size
while (*pw++); // Skip typeface name
}
// Dword-align and return
return (DLGITEMTEMPLATE*)(((DWORD_PTR)pw + 3) & ~3);
}
// Given the current dialog item and whether this is an extended dialog
// return a pointer to the next DLGITEMTEMPLATE*
static DLGITEMTEMPLATE* FindNextDlgItem(DLGITEMTEMPLATE* pItem, BOOL bDialogEx)
{
WORD* pw;
// First skip fixed size header information, size of which depends
// if this is a DLGITEMTEMPLATE or DLGITEMTEMPLATEEX
if (bDialogEx)
pw = (WORD*)((DLGITEMTEMPLATEEX*)pItem + 1);
else
pw = (WORD*)(pItem + 1);
if (*pw == 0xFFFF) // Skip class name ordinal or string
pw += 2; // (WORDs)
else
while (*pw++);
if (*pw == 0xFFFF) // Skip title ordinal or string
pw += 2; // (WORDs)
else
while (*pw++);
WORD cbExtra = *pw++; // Skip extra data
// cbExtra includes the size WORD in DIALOG resource.
if (cbExtra != 0 && !bDialogEx)
cbExtra -= 2;
// Dword-align and return
return (DLGITEMTEMPLATE*)(((DWORD_PTR)pw + cbExtra + 3) & ~3);
}
};
struct dialogdata_t
{
int pt,has_menu;
unsigned weight;
BOOL italic;
LPCWSTR faceName;
};
static void getptsize( HDC &dc, HFONT &font, SIZE *pSize )
{
HFONT oldfont = 0;
static char *sym = "abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
SIZE sz;
TEXTMETRICA t;
oldfont = (HFONT)SelectObject(dc,font);
GetTextMetricsA(dc,&t);
GetTextExtentPointA(dc,sym, 52, &sz);
pSize->cy = t.tmHeight;
pSize->cx = (sz.cx / 26 + 1) / 2;
SelectObject(dc,oldfont);
}
#define word_at(ptr) (*(WORD *)(ptr))
#define dword_at(ptr) (*(DWORD *)(ptr))
static void querydialogdata( LPCSTR data, dialogdata_t * result )
{
WORD *p = (WORD *)data;
unsigned long rstyle = dword_at(p);
int dialogex=0;
p += 2;
if (rstyle == 0xffff0001)
{
p+=4;
rstyle=dword_at(p);
p+=2;
dialogex=1;
}else
p+=2;
p+=5;
// Skip menu
switch(word_at(p))
{
case 0x0000: // no menu name
result->has_menu=0;
p++;
break;
case 0xffff: // has menu
result->has_menu=1;
p += 2;
break;
default: // has menu
result->has_menu=1;
p+=wcslen((LPCWSTR)p)+1;
break;
}
// skip class name
switch(word_at(p))
{
case 0x0000:
p++;
break;
case 0xffff:
p += 2;
break;
default:
p+=wcslen((LPCWSTR)p)+1;
break;
}
// skip the caption
p+=wcslen((LPCWSTR)p)+1;
// get the font name
if (rstyle & DS_SETFONT)
{
result->pt = word_at(p); p++;
if (dialogex)
{
result->weight = word_at(p); p++;
result->italic = LOBYTE(word_at(p)); p++;
}else
{
result->weight = FW_DONTCARE;
result->italic = FALSE;
}
result->faceName = (LPCWSTR)p;
p += wcslen( result->faceName ) + 1;
}else
{
result->faceName=L"Tahoma"; // TODO: put system font name here
result->pt=8; // TODO
result->weight=FW_NORMAL; // TODO
result->italic=FALSE; // TODO
}
}
CSetDPI::CSetDPI()
{
hwnd=0;
font=0;
oldfont=0;
inst=0;
IDD=0;
}
CSetDPI::~CSetDPI()
{
Detach();
}
void CSetDPI::Attach(HINSTANCE hInst,HWND _hwnd,int _IDD,double dpi)
{
int t;
if (hwnd) Detach();
inst = hInst;
IDD = _IDD;
hwnd=_hwnd;
helper::DLGTEMPLATEEX *lpDialogTemplate;
if (!hInst)
{ } // hInst = AfxFindResourceHandle(IMAKEINTRESOURCE(IDD), RT_DIALOG);
HRSRC hResource = ::FindResource(hInst, MAKEINTRESOURCE(IDD), RT_DIALOG);
HANDLE hDialogTemplate = LoadResource(hInst, hResource);
lpDialogTemplate = (helper::DLGTEMPLATEEX *)LockResource(hDialogTemplate);
dialogdata_t dd;
querydialogdata((LPCSTR)lpDialogTemplate,&dd);
if ((dd.pt<0)||(dd.pt>32767))
{
// I don't know what to do if it happens this way
// this is a compromise solution:
dd.pt=-dd.pt;
dd.pt&=0xFFFF;
}
font=CreateFontW(
-(int)(dd.pt*dpi/72.0 + 0.5), // negative makes it use "char size"
0, // logical average character width
0, // angle of escapement
0, // base-line orientation angle
dd.weight, // weight
dd.italic, // italic
FALSE, // underline attribute flag
FALSE, // strikeout attribute flag
DEFAULT_CHARSET, // character set identifier
OUT_DEFAULT_PRECIS, // output precision
CLIP_DEFAULT_PRECIS,// clipping precision
DEFAULT_QUALITY, // output quality
DEFAULT_PITCH, // pitch and family
dd.faceName // pointer to typeface name string
);
oldfont=(HFONT)::SendMessage(hwnd, WM_GETFONT, 0, 0);
SendMessage(hwnd, WM_SETFONT, (LPARAM)font, TRUE);
SIZE szf;
PAINTSTRUCT ps;
HDC dc=BeginPaint(hwnd, &ps);
getptsize(dc,font,&szf);
EndPaint(hwnd, &ps);
double x_n=szf.cx,
x_d=4,
y_n=szf.cy,
y_d=8;
RECT rect;
GetClientRect(hwnd,&rect);
rect.right=rect.left+(int)(lpDialogTemplate->cx*x_n/x_d+0.5);
rect.bottom=rect.top+(int)(lpDialogTemplate->cy*y_n/y_d+0.5);
ClientToScreen(hwnd, (LPPOINT)&rect);
ClientToScreen(hwnd, ((LPPOINT)&rect)+1);
AdjustWindowRectEx(&rect, lpDialogTemplate->style, dd.has_menu, lpDialogTemplate->exStyle );
MoveWindow(hwnd,rect.left,rect.top,rect.right-rect.left,rect.bottom-rect.top,TRUE);
helper::DLGITEMTEMPLATEEX *item=
(helper::DLGITEMTEMPLATEEX *)helper::FindFirstDlgItem((DLGTEMPLATE *)lpDialogTemplate);
HWND wnd;
for(t=0;t<helper::DlgTemplateItemCount((DLGTEMPLATE *)lpDialogTemplate);t++)
{
// OLD IMPLEMENTATION: wnd=GetDlgItem(hwnd,item->id);
// TODO: check if it is the best implementation
// are we sure that controls will preserve the order?
if (!t)
wnd=GetWindow(hwnd,GW_CHILD);
else
wnd=GetWindow(wnd,GW_HWNDNEXT);
while ((wnd)&&(GetDlgCtrlID(wnd) != item->id))
wnd=GetWindow(wnd,GW_HWNDNEXT);
if (!wnd) break;
MoveWindow(wnd,(int)(item->x*x_n/x_d+0.5),
(int)(item->y*y_n/y_d+0.5),
(int)(item->cx*x_n/x_d+0.5),
(int)(item->cy*y_n/y_d+0.5), TRUE);
SendMessage(wnd, WM_SETFONT, (LPARAM)font, TRUE);
item=(helper::DLGITEMTEMPLATEEX *)helper::FindNextDlgItem((DLGITEMTEMPLATE *)item,TRUE);
}
UnlockResource(hDialogTemplate);
FreeResource(hDialogTemplate);
}
void CSetDPI::Detach()
{
if (!hwnd) return;
SendMessage(hwnd, WM_SETFONT, (LPARAM)oldfont, TRUE);
HRSRC hResource = ::FindResource(inst, MAKEINTRESOURCE(IDD), RT_DIALOG);
HANDLE hDialogTemplate = LoadResource(inst, hResource);
helper::DLGTEMPLATEEX *lpDialogTemplate =
(helper::DLGTEMPLATEEX *)LockResource(hDialogTemplate);
helper::DLGITEMTEMPLATEEX *item=
(helper::DLGITEMTEMPLATEEX *)helper::FindFirstDlgItem((DLGTEMPLATE *)lpDialogTemplate);
int t;
HWND wnd;
for(t=0;t<helper::DlgTemplateItemCount((DLGTEMPLATE *)lpDialogTemplate);t++)
{
// OLD IMPLEMENTATION: wnd=GetDlgItem(hwnd,item->id);
// TODO: check if it is the best implementation
// are we sure that controls will preserve the order?
if (!t)
wnd=GetWindow(hwnd,GW_CHILD);
else
wnd=GetWindow(wnd,GW_HWNDNEXT);
while ((wnd)&&(GetDlgCtrlID(wnd) != item->id))
wnd=GetWindow(wnd,GW_HWNDNEXT);
if (!wnd) break;
SendMessage(wnd, WM_SETFONT, (LPARAM)oldfont, TRUE);
item=(helper::DLGITEMTEMPLATEEX *)helper::FindNextDlgItem((DLGITEMTEMPLATE *)item,TRUE);
}
UnlockResource(hDialogTemplate);
FreeResource(hDialogTemplate);
DeleteObject(font);
hwnd=0;
font=0;
oldfont=0;
}
Submit an article or tip