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/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2013-2014 Volker Ruppert
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
// Define BX_PLUGGABLE in files that can be compiled into plugins. For
// platforms that require a special tag on exported symbols, BX_PLUGGABLE
// is used to know when we are exporting symbols and when we are importing.
#define BX_PLUGGABLE
#include "config.h"
#if BX_USE_WIN32CONFIG
#include <windows.h>
#include <commctrl.h>
LRESULT CALLBACK ScrollWinProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
SCROLLINFO si;
BOOL pull = FALSE, redraw = FALSE;
static int vsize = 0, wsize = 0, starty = 0;
int scrolly, oldy = 0;
short delta;
RECT R;
oldy = starty;
switch (msg) {
case WM_CREATE:
GetClientRect(hwnd, &R);
wsize = R.bottom;
vsize = wsize;
starty = 0;
si.cbSize = sizeof(SCROLLINFO);
si.fMask = SIF_POS | SIF_PAGE | SIF_RANGE | SIF_DISABLENOSCROLL;
si.nMin = 0;
si.nMax = vsize - 1;
si.nPage = wsize;
si.nPos = starty;
SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
break;
case WM_VSCROLL:
switch (LOWORD(wParam)) {
case SB_LINEDOWN:
if (starty < (vsize - wsize)) {
starty++;
redraw = TRUE;
}
break;
case SB_LINEUP:
if (starty > 0) {
starty--;
redraw = TRUE;
}
break;
case SB_PAGEDOWN:
if (starty < (vsize - wsize)) {
starty += wsize;
if (starty > (vsize - wsize)) {
starty = vsize - wsize;
}
redraw = TRUE;
}
break;
case SB_PAGEUP:
if (starty > 0) {
starty -= wsize;
if (starty < 0) starty = 0;
redraw = TRUE;
}
break;
case SB_TOP:
if (starty > 0) {
starty = 0;
redraw = TRUE;
}
break;
case SB_BOTTOM:
starty = vsize - wsize;
redraw = TRUE;
break;
case SB_THUMBPOSITION:
redraw = TRUE;
break;
case SB_THUMBTRACK:
starty = HIWORD(wParam);
SetScrollPos(hwnd, SB_VERT, starty, TRUE);
pull = TRUE;
redraw = (starty != oldy);
break;
}
break;
case WM_MOUSEWHEEL:
delta = (short)HIWORD(wParam);
if (delta < 0) {
if (starty < (vsize - wsize)) {
starty += 3;
if (starty > (vsize - wsize)) {
starty = vsize - wsize;
}
redraw = TRUE;
break;
}
} else if (delta > 0) {
if (starty > 0) {
starty -= 3;
if (starty < 0) starty = 0;
redraw = TRUE;
break;
}
}
return 0;
case WM_USER:
if (wParam == 0x1234) {
vsize = (int)lParam;
si.cbSize = sizeof(SCROLLINFO);
si.fMask = SIF_RANGE | SIF_DISABLENOSCROLL;
si.nMin = 0;
si.nMax = vsize - 1;
SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
redraw = TRUE;
}
break;
}
if (redraw) {
if (!pull) {
SetScrollPos(hwnd, SB_VERT, starty, TRUE);
}
scrolly = oldy - starty;
if (scrolly != 0) {
ScrollWindowEx(hwnd, 0, scrolly, NULL, NULL, NULL, NULL, SW_INVALIDATE | SW_ERASE | SW_SCROLLCHILDREN);
}
return 0;
} else {
return DefWindowProc(hwnd, msg, wParam,lParam);
}
}
BOOL RegisterScrollWindow(HINSTANCE hinst)
{
WNDCLASS wc;
memset(&wc,0,sizeof(WNDCLASS));
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = (WNDPROC)ScrollWinProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hinst;
wc.hIcon = NULL;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
wc.lpszMenuName = NULL;
wc.lpszClassName = "ScrollWin";
return (RegisterClass(&wc) != 0);
}
#endif
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