focus.cpp

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// focus.cpp


#include "focus.h"
#include "windowstool.h"


///
static LRESULT CALLBACK WndProc(
	HWND i_hwnd, UINT i_message, WPARAM i_wParam, LPARAM i_lParam)
{
	switch (i_message) {
	case WM_KEYDOWN:
	case WM_SYSKEYDOWN:
	case WM_KEYUP:
	case WM_SYSKEYUP:
		SendMessage(GetParent(i_hwnd), WM_APP_notifyVKey, i_wParam, i_lParam);
		return 0;
	case WM_CHAR:
	case WM_DEADCHAR:
		return 0;
	case WM_LBUTTONDOWN: {
		SetFocus(i_hwnd);
		return 0;
	}
	case WM_SETFOCUS: {
		RECT rc;
		GetClientRect(i_hwnd, &rc);
		CreateCaret(i_hwnd, reinterpret_cast<HBITMAP>(NULL), 2,
					rcHeight(&rc) / 2);
		ShowCaret(i_hwnd);
		SetCaretPos(rcWidth(&rc) / 2, rcHeight(&rc) / 4);
		SendMessage(GetParent(i_hwnd), WM_APP_notifyFocus,
					TRUE, (LPARAM)i_hwnd);
		return 0;
	}
	case WM_KILLFOCUS: {
		HideCaret(i_hwnd);
		DestroyCaret();
		SendMessage(GetParent(i_hwnd), WM_APP_notifyFocus,
					FALSE, (LPARAM)i_hwnd);
		return 0;
	}
	case WM_GETDLGCODE:
		return DLGC_WANTALLKEYS;
	}
	return DefWindowProc(i_hwnd, i_message, i_wParam, i_lParam);
}


ATOM Register_focus()
{
	WNDCLASS wc;
	wc.style         = CS_HREDRAW | CS_VREDRAW;
	wc.lpfnWndProc   = WndProc;
	wc.cbClsExtra    = 0;
	wc.cbWndExtra    = 0;
	wc.hInstance     = g_hInst;
	wc.hIcon         = NULL;
	wc.hCursor       = LoadCursor(NULL, IDC_IBEAM);
	wc.hbrBackground = reinterpret_cast<HBRUSH>(COLOR_WINDOW + 1);
	wc.lpszMenuName  = NULL;
	wc.lpszClassName = _T("mayuFocus");
	return RegisterClass(&wc);
}