libui/util_windows.c

// 6 april 2015
#include "uipriv_windows.h"

#define MBTWC(str, wstr, bufsiz) MultiByteToWideChar(CP_UTF8, 0, str, -1, wstr, bufsiz)

WCHAR *toUTF16(const char *str)
{
	WCHAR *wstr;
	int n;

	n = MBTWC(str, NULL, 0);
	if (n == 0)
		logLastError("error figuring out number of characters to convert to in toUTF16()");
	wstr = (WCHAR *) uiAlloc(n * sizeof (WCHAR));
	if (MBTWC(str, wstr, n) != n)
		logLastError("error converting from UTF-8 to UTF-16 in toUTF16()");
	return wstr;
}

/*
all container windows (including the message-only window, hence this is not in container_windows.c) have to call the sharedWndProc() to ensure messages go in the right place and control colors are handled properly
*/

/*
all controls that have events receive the events themselves through subclasses
to do this, all container windows (including the message-only window; see http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q104069) forward WM_COMMAND to each control with this function, WM_NOTIFY with forwardNotify, etc.
*/
static LRESULT forwardCommand(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	HWND control = (HWND) lParam;

	// don't generate an event if the control (if there is one) is unparented (a child of the initial parent window)
	if (control != NULL && IsChild(initialParent, control) == 0)
		return SendMessageW(control, msgCOMMAND, wParam, lParam);
	return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}

static LRESULT forwardNotify(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	NMHDR *nmhdr = (NMHDR *) lParam;
	HWND control = nmhdr->hwndFrom;

	// don't generate an event if the control (if there is one) is unparented (a child of the initial parent window)
	if (control != NULL && IsChild(initialParent, control) == 0)
		return SendMessageW(control, msgNOTIFY, wParam, lParam);
	return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}

BOOL sharedWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT *lResult)
{
	switch (uMsg) {
	case WM_COMMAND:
		*lResult = forwardCommand(hwnd, uMsg, wParam, lParam);
		return TRUE;
	case WM_NOTIFY:
		*lResult = forwardNotify(hwnd, uMsg, wParam, lParam);
		return TRUE;
/*TODO	case WM_CTLCOLORSTATIC:
	case WM_CTLCOLORBTN:
		// read-only TextFields and Textboxes are exempt
		// this is because read-only edit controls count under WM_CTLCOLORSTATIC
		if (windowClassOf((HWND) lParam, L"edit", NULL) == 0)
			if (textfieldReadOnly((HWND) lParam))
				return FALSE;
		if (SetBkMode((HDC) wParam, TRANSPARENT) == 0)
			xpanic("error setting transparent background mode to Labels", GetLastError());
		paintControlBackground((HWND) lParam, (HDC) wParam);
		*lResult = (LRESULT) hollowBrush;
		return TRUE;
*/	}
	return FALSE;
}