Advanced MFC Programming

Chapter 4. Button
SetCapture();
m_bCheck=TRUE;
SetState(TRUE);
Invalidate();
}
else
{
CRect rect;
}
}
GetClientRect(rect);
if(!rect.PtInRect(point))
{
ReleaseCapture();
m_bCheck=FALSE;
SetState(FALSE);
Invalidate();
}
In function MCSenButton::OnMouseMove(…), if m_bCheck is FALSE, it means the button is in the
normal state. In this case, we need to set mouse capture, change the button to “highlighted” state, and
redraw the button. If the button is currently highlighted, we need to check the current position of mouse
cursor, if it has moved out of the button window, we should resume button’s normal state, and redraw the
button. Here, CButton::SetState(…) is used to set the button to different states (it will cause the bitmap
button to use the corresponding bitmap), and CWnd::Invalidate() is used to cause the button to be
redrawn.
In function MCSenButton::OnCaptureChanged(…), we need to change m_bCheck back to FALSE, and
resume button’s normal state.
Implementation
In the sample, four new buttons are added to the application. The IDs of these new buttons are
IDC_MOUSE_SEN_1, IDC_MOUSE_SEN_2, IDC_MOUSE_SEN_3 and IDC_MOUSE_SEN_4 respectively. An
MCSenButton type array m_btnBmp (The array size is 4) is declared in class CBtnDlg and initialized in
function CBtnDlg::OnInitDialog() as follows:
……
……
……
class CBtnDlg : public CDialog
{
protected:
};
MCSenButton m_btnBmp[4];
BOOL CBtnDlg::OnInitDialog()
{
CDialog::OnInitDialog();
CRect rect;
int x, y;
int i;
……
……
}
for(i=IDC_MOUSE_SEN_1; i