moving a STATIC as scrollbar (C++ Learning Community)

Title: moving a STATIC as scrollbar

hehzz - May 9, 2005 04:59 PM (GMT)

I'm trying to make a scrollbar with a STATIC (cuz AFAIK scrollbar can't be ownerdrawn, but i need it graphical). So i'm getting WM_MOUSEMOVE messages and moving the STATIC up or down, but as far as i have made it it doesn't work :wacko:

the code:

CODE

#include <windows.h>
#include "resource.h"
#include <iostream>

using namespace std;

LRESULT CALLBACK MainDlgProc(HWND hWndDlg, UINT Msg, WPARAM wParam, LPARAM lParam);

bool moving = false;
int oy = 0;

int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nFunsterStil)
{
DialogBox(hThisInstance, MAKEINTRESOURCE(IDD_DLGMAIN),
NULL, reinterpret_cast<DLGPROC>(MainDlgProc));
return 0;
}

LRESULT CALLBACK MainDlgProc(HWND hWndDlg, UINT Msg, WPARAM wParam, LPARAM lParam)
{
if (Msg == WM_INITDIALOG)
{
HFONT hFont = CreateFont(24, 20, 0, 0,
FW_THIN, FALSE, FALSE, FALSE,
ANSI_CHARSET, OUT_DEFAULT_PRECIS,
CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY,
FF_DONTCARE, "Georgia");
SendDlgItemMessage(hWndDlg, IDE_NUMBER, WM_SETFONT, (WPARAM)hFont, (LPARAM)MAKELPARAM(true, 0));

return true;
}
if (Msg == WM_LBUTTONDOWN)
{
WINDOWPLACEMENT winplace, scrplace;
winplace.length = sizeof(winplace);
GetWindowPlacement(GetDlgItem(hWndDlg, IDE_NUMBER), &winplace);
RECT wplace = winplace.rcNormalPosition;

int x = LOWORD(lParam);
int y = HIWORD(lParam);

if (x >= wplace.left &&
y >= wplace.top &&
x <= wplace.right &&
y <= wplace.bottom)
{
oy = y - wplace.top;
moving = true;
}
}
if (Msg == WM_LBUTTONUP)
{
moving = false;
}
if (Msg == WM_MOUSEMOVE)
{
if (moving)
{
if (wParam == MK_LBUTTON)
{
WINDOWPLACEMENT winplace, scrplace;
winplace.length = sizeof(winplace);
GetWindowPlacement(GetDlgItem(hWndDlg, IDE_NUMBER), &winplace);
RECT wplace = winplace.rcNormalPosition;

int x = LOWORD(lParam);
int y = HIWORD(lParam);

if (x >= wplace.left &&
y >= wplace.top &&
x <= wplace.right &&
y <= wplace.bottom)
{

cout << "top: " << wplace.top << endl
<< "y: " << y << endl
<< "oy: " << oy << endl;
MoveWindow(GetDlgItem(hWndDlg, IDE_NUMBER),
wplace.left,
(wplace.top - (oy - (y - wplace.top))),
wplace.right - wplace.left,
wplace.bottom - wplace.top, true);
oy = y - wplace.top;
}
}
}
return true;
}
return false;
}

It seems that it receives too much WM_MOUSEMOVE messages (even if no mouse is moved)..
Ridiculous is that if i change line:

CODE

(wplace.top - (oy - (y - wplace.top))),

CODE

(wplace.top + (oy - (y - wplace.top))),

to make it work reverse, it works as it have to work!
what's the problem??? :o

hehzz - May 9, 2005 06:40 PM (GMT)

yay i solved the problem...

CODE

#include <windows.h>
#include "resource.h"
#include <iostream>

using namespace std;

LRESULT CALLBACK MainDlgProc(HWND hWndDlg, UINT Msg, WPARAM wParam, LPARAM lParam);

bool moving = false;
int oy = 0;

int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nFunsterStil)
{
DialogBox(hThisInstance, MAKEINTRESOURCE(IDD_DLGMAIN),
NULL, reinterpret_cast<DLGPROC>(MainDlgProc));
return 0;
}

LRESULT CALLBACK MainDlgProc(HWND hWndDlg, UINT Msg, WPARAM wParam, LPARAM lParam)
{
if (Msg == WM_INITDIALOG)
{
HFONT hFont = CreateFont(24, 20, 0, 0,
FW_THIN, FALSE, FALSE, FALSE,
ANSI_CHARSET, OUT_DEFAULT_PRECIS,
CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY,
FF_DONTCARE, "Georgia");
SendDlgItemMessage(hWndDlg, IDE_NUMBER, WM_SETFONT, (WPARAM)hFont, (LPARAM)MAKELPARAM(true, 0));

return true;
}
if (Msg == WM_LBUTTONDOWN)
{
WINDOWPLACEMENT winplace, scrplace;
winplace.length = sizeof(winplace);
GetWindowPlacement(GetDlgItem(hWndDlg, IDE_NUMBER), &winplace);
RECT wplace = winplace.rcNormalPosition;

int x = LOWORD(lParam);
int y = HIWORD(lParam);

if (x >= wplace.left &&
y >= wplace.top &&
x <= wplace.right &&
y <= wplace.bottom)
{
oy = y;
moving = true;
}
}
if (Msg == WM_LBUTTONUP)
{
moving = false;
}
if (Msg == WM_MOUSEMOVE)
{
if (moving)
{
if (wParam == MK_LBUTTON)
{
WINDOWPLACEMENT winplace, scrplace;
winplace.length = sizeof(winplace);
GetWindowPlacement(GetDlgItem(hWndDlg, IDE_NUMBER), &winplace);
RECT wplace = winplace.rcNormalPosition;

int x = LOWORD(lParam);
int y = HIWORD(lParam);

if (x >= wplace.left &&
y >= wplace.top &&
x <= wplace.right &&
y <= wplace.bottom)
{
if (oy != (y - wplace.top))
{
MoveWindow(GetDlgItem(hWndDlg, IDE_NUMBER),
wplace.left,
(wplace.top - ((oy - wplace.top) - (y - wplace.top))),
wplace.right - wplace.left,
wplace.bottom - wplace.top, true);
oy = y;
}
}
}
}
return true;
}
return false;
}

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