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// 16 august 2014
#define UNICODE
#define _UNICODE
#define STRICT
#define STRICT_TYPED_ITEMIDS
#define CINTERFACE
// get Windows version right; right now Windows XP
#define WINVER 0x0501
#define _WIN32_WINNT 0x0501
#define _WIN32_WINDOWS 0x0501 /* according to Microsoft's winperf.h */
#define _WIN32_IE 0x0600 /* according to Microsoft's sdkddkver.h */
#define NTDDI_VERSION 0x05010000 /* according to Microsoft's sdkddkver.h */
#include <windows.h>
#include <commctrl.h>
#include <stdint.h>
#include <uxtheme.h>
#include <string.h>
#include <wchar.h>
#include <windowsx.h>
#include <vsstyle.h>
#include <vssym32.h>
#include <oleacc.h>
enum {
checkboxStateChecked = 1 << 0,
checkboxStateHot = 1 << 1,
checkboxStatePushed = 1 << 2,
checkboxnStates = 1 << 3,
};
#define xpanic(...) abort()
#define xpanichresult(...) abort()
static UINT dfcState(int cbstate)
{
UINT ret;
ret = DFCS_BUTTONCHECK;
if ((cbstate & checkboxStateChecked) != 0)
ret |= DFCS_CHECKED;
if ((cbstate & checkboxStateHot) != 0)
ret |= DFCS_HOT;
if ((cbstate & checkboxStatePushed) != 0)
ret |= DFCS_PUSHED;
return ret;
}
static void dfcImage(HDC dc, RECT *r, int cbState, HTHEME theme)
{
if (DrawFrameControl(dc, r, DFC_BUTTON, dfcState(cbState)) == 0)
xpanic("error drawing checkbox image", GetLastError());
}
static void dfcSize(HDC dc, int *width, int *height, HTHEME theme)
{
// there's no real metric around
// let's use SM_CX/YSMICON and hope for the best
*width = GetSystemMetrics(SM_CXSMICON);
*height = GetSystemMetrics(SM_CYSMICON);
}
static int themestates[checkboxnStates] = {
CBS_UNCHECKEDNORMAL, // 0
CBS_CHECKEDNORMAL, // checked
CBS_UNCHECKEDHOT, // hot
CBS_CHECKEDHOT, // checked | hot
CBS_UNCHECKEDPRESSED, // pushed
CBS_CHECKEDPRESSED, // checked | pushed
CBS_UNCHECKEDPRESSED, // hot | pushed
CBS_CHECKEDPRESSED, // checked | hot | pushed
};
static SIZE getStateSize(HDC dc, int cbState, HTHEME theme)
{
SIZE s;
HRESULT res;
res = GetThemePartSize(theme, dc, BP_CHECKBOX, themestates[cbState], NULL, TS_DRAW, &s);
if (res != S_OK)
xpanichresult("error getting theme part size", res);
return s;
}
static void themeImage(HDC dc, RECT *r, int cbState, HTHEME theme)
{
HRESULT res;
res = DrawThemeBackground(theme, dc, BP_CHECKBOX, themestates[cbState], r, NULL);
if (res != S_OK)
xpanichresult("error drawing checkbox image", res);
}
static void themeSize(HDC dc, int *width, int *height, HTHEME theme)
{
SIZE size;
int cbState;
size = getStateSize(dc, 0, theme);
for (cbState = 1; cbState < checkboxnStates; cbState++) {
SIZE against;
against = getStateSize(dc, cbState, theme);
if (size.cx != against.cx || size.cy != against.cy)
xpanic("size mismatch in checkbox states", GetLastError());
}
*width = (int) size.cx;
*height = (int) size.cy;
}
static HBITMAP makeCheckboxImageListEntry(HDC dc, int width, int height, int cbState, void (*drawfunc)(HDC, RECT *, int, HTHEME), HTHEME theme)
{
BITMAPINFO bi;
VOID *ppvBits;
HBITMAP bitmap;
RECT r;
HDC drawDC;
HBITMAP prevbitmap;
r.left = 0;
r.top = 0;
r.right = width;
r.bottom = height;
ZeroMemory(&bi, sizeof (BITMAPINFO));
bi.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
bi.bmiHeader.biWidth = (LONG) width;
bi.bmiHeader.biHeight = -((LONG) height); // negative height to force top-down drawing;
bi.bmiHeader.biPlanes = 1;
bi.bmiHeader.biBitCount = 32;
bi.bmiHeader.biCompression = BI_RGB;
bi.bmiHeader.biSizeImage = (DWORD) (width * height * 4);
bitmap = CreateDIBSection(NULL, &bi, DIB_RGB_COLORS, &ppvBits, 0, 0);
if (bitmap == NULL)
xpanic("error creating HBITMAP for unscaled ImageList image copy", GetLastError());
drawDC = CreateCompatibleDC(dc);
if (drawDC == NULL)
xpanic("error getting DC for checkbox image list bitmap", GetLastError());
prevbitmap = SelectObject(drawDC, bitmap);
if (prevbitmap == NULL)
xpanic("error selecting checkbox image list bitmap into DC", GetLastError());
(*drawfunc)(drawDC, &r, cbState, theme);
if (SelectObject(drawDC, prevbitmap) != bitmap)
xpanic("error selecting previous bitmap into checkbox image's DC", GetLastError());
if (DeleteDC(drawDC) == 0)
xpanic("error deleting checkbox image's DC", GetLastError());
return bitmap;
}
static HIMAGELIST newCheckboxImageList(HWND hwnddc, void (*sizefunc)(HDC, int *, int *, HTHEME), void (*drawfunc)(HDC, RECT *, int, HTHEME), HTHEME theme, int *width, int *height)
{
int cbState;
HDC dc;
HIMAGELIST il;
dc = GetDC(hwnddc);
if (dc == NULL)
xpanic("error getting DC for making the checkbox image list", GetLastError());
(*sizefunc)(dc, width, height, theme);
il = ImageList_Create(*width, *height, ILC_COLOR32, 20, 20); // should be reasonable
if (il == NULL)
xpanic("error creating checkbox image list", GetLastError());
for (cbState = 0; cbState < checkboxnStates; cbState++) {
HBITMAP bitmap;
bitmap = makeCheckboxImageListEntry(dc, *width, *height, cbState, drawfunc, theme);
if (ImageList_Add(il, bitmap, NULL) == -1)
xpanic("error adding checkbox image to image list", GetLastError());
if (DeleteObject(bitmap) == 0)
xpanic("error deleting checkbox bitmap", GetLastError());
}
if (ReleaseDC(hwnddc, dc) == 0)
xpanic("error deleting checkbox image list DC", GetLastError());
return il;
}
HIMAGELIST makeCheckboxImageList(HWND hwnddc, HTHEME *theme, int *width, int *height)
{
if (*theme != NULL) {
HRESULT res;
res = CloseThemeData(*theme);
if (res != S_OK)
xpanichresult("error closing theme", res);
*theme = NULL;
}
// ignore error; if it can't be done, we can fall back to DrawFrameControl()
if (*theme == NULL) // try to open the theme
*theme = OpenThemeData(hwnddc, L"button");
if (*theme != NULL) // use the theme
return newCheckboxImageList(hwnddc, themeSize, themeImage, *theme, width, height);
// couldn't open; fall back
return newCheckboxImageList(hwnddc, dfcSize, dfcImage, *theme, width, height);
}
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