reactos/rosapps/devutils/zoomin/framewnd.c

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/*
* ReactOS zoomin
*
* framewnd.c
*
* Copyright (C) 2002 Robert Dickenson <robd@reactos.org>
* Copyright (C) 2005 Martin Fuchs <martin-fuchs@gmx.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers
#include <windows.h>
#include <windowsx.h>
#include <tchar.h>
#include "main.h"
#include "framewnd.h"
extern void ExitInstance();
////////////////////////////////////////////////////////////////////////////////
// Global Variables:
//
static int s_factor = 2; // zoom factor
static POINT s_srcPos = {0, 0}; // source rectangle position
static RECT s_lastSrc = {-1,-1,-1,-1}; // last cursor position
BOOL s_dragging = FALSE;
// zoom range
#define MIN_ZOOM 1
#define MAX_ZOOM 16
////////////////////////////////////////////////////////////////////////////////
//
// FUNCTION: SetZoom()
//
// PURPOSE: Change zoom level
//
static void SetZoom(HWND hWnd, int factor)
{
TCHAR buffer[MAX_LOADSTRING];
if (factor>=MIN_ZOOM && factor<=MAX_ZOOM) {
s_factor = factor;
SetScrollPos(hWnd, SB_VERT, s_factor, TRUE);
wsprintf(buffer, TEXT("%s %dx"), szTitle, s_factor);
SetWindowText(hWnd, buffer);
}
}
////////////////////////////////////////////////////////////////////////////////
//
// FUNCTION: _CmdWndProc(HWND, unsigned, WORD, LONG)
//
// PURPOSE: Processes WM_COMMAND messages for the main frame window.
//
//
static BOOL _CmdWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (LOWORD(wParam)) {
// Parse the menu selections:
case ID_EDIT_EXIT:
DestroyWindow(hWnd);
break;
case ID_EDIT_COPY:
case ID_EDIT_REFRESH:
case ID_OPTIONS_REFRESH_RATE:
case ID_HELP_ABOUT:
// TODO:
break;
case ID_REFRESH:
InvalidateRect(hWnd, NULL, FALSE);
break;
default:
return FALSE;
}
return TRUE;
}
////////////////////////////////////////////////////////////////////////////////
//
// FUNCTION: FrameWndProc(HWND, unsigned, WORD, LONG)
//
// PURPOSE: Processes messages for the main window.
//
LRESULT CALLBACK FrameWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) {
case WM_CREATE:
SetTimer(hWnd, 0, 200, NULL); // refresh display all 200 ms
SetScrollRange(hWnd, SB_VERT, 1, MAX_ZOOM, FALSE);
SetZoom(hWnd, s_factor);
break;
case WM_COMMAND:
if (!_CmdWndProc(hWnd, message, wParam, lParam)) {
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_PAINT: {
PAINTSTRUCT ps;
HDC hdcMem;
RECT clnt;
SIZE size;
BeginPaint(hWnd, &ps);
hdcMem = GetDC(GetDesktopWindow());
GetClientRect(hWnd, &clnt);
size.cx = (clnt.right + s_factor-1) / s_factor;
size.cy = (clnt.bottom + s_factor-1) / s_factor;
StretchBlt(ps.hdc, 0, 0, size.cx*s_factor, size.cy*s_factor,
hdcMem, s_srcPos.x, s_srcPos.y, size.cx, size.cy, SRCCOPY);
ReleaseDC(GetDesktopWindow(), hdcMem);
EndPaint(hWnd, &ps);
break;}
case WM_TIMER:
if (s_dragging && GetCapture()==hWnd) {
RECT clnt, rect;
int width = GetSystemMetrics(SM_CXSCREEN);
int height = GetSystemMetrics(SM_CYSCREEN);
GetCursorPos(&s_srcPos);
GetClientRect(hWnd, &clnt);
s_srcPos.x -= clnt.right / s_factor / 2;
s_srcPos.y -= clnt.bottom / s_factor / 2;
if (s_srcPos.x < 0)
s_srcPos.x = 0;
else if (s_srcPos.x+clnt.right/s_factor > width)
s_srcPos.x = width - clnt.right/s_factor;
if (s_srcPos.y < 0)
s_srcPos.y = 0;
else if (s_srcPos.y+clnt.bottom/s_factor > height)
s_srcPos.y = height - clnt.bottom/s_factor;
if (memcmp(&rect, &s_lastSrc, sizeof(RECT))) {
HDC hdc = GetDC(0);
if (s_lastSrc.bottom != -1)
DrawFocusRect(hdc, &s_lastSrc);
rect.left = s_srcPos.x - 1;
rect.top = s_srcPos.y - 1;
rect.right = rect.left + clnt.right/s_factor + 2;
rect.bottom = rect.top + clnt.bottom/s_factor + 2;
DrawFocusRect(hdc, &rect);
ReleaseDC(0, hdc);
s_lastSrc = rect;
}
}
InvalidateRect(hWnd, NULL, FALSE);
UpdateWindow(hWnd);
break;
case WM_LBUTTONDOWN:
s_dragging = TRUE;
SetCapture(hWnd);
break;
case WM_LBUTTONUP:
case WM_CANCELMODE:
if (s_dragging) {
HDC hdc = GetDC(0);
DrawFocusRect(hdc, &s_lastSrc);
ReleaseDC(0, hdc);
s_lastSrc.bottom = -1;
s_dragging = FALSE;
ReleaseCapture();
}
break;
case WM_VSCROLL:
switch(wParam) {
case SB_LINEUP:
case SB_PAGEUP:
SetZoom(hWnd, s_factor-1);
break;
case SB_LINEDOWN:
case SB_PAGEDOWN:
SetZoom(hWnd, s_factor+1);
break;
}
break;
case WM_DESTROY:
KillTimer(hWnd, 0);
PostQuitMessage(0);
ExitInstance();
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}