//------------------------------------------------------------------------------
// File: ContProp.cpp
//
// Desc: DirectShow sample code - implementation of property page class
//       for the contrast filter.
//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//------------------------------------------------------------------------------

#include <streams.h>
#include <commctrl.h>
#include <olectl.h>
#include <memory.h>
#include "resource.h"
#include "contuids.h"
#include "icontrst.h"
#include "contrast.h"
#include "contprop.h"


//
// CreateInstance
//
// This goes in the factory template table to create new filter instances
//
CUnknown * WINAPI CContrastProperties::CreateInstance(LPUNKNOWN lpunk, HRESULT *phr)
{
    ASSERT(phr);

    CUnknown *punk = new CContrastProperties(lpunk, phr);

    if(punk == NULL)
    {
        if (phr)
            *phr = E_OUTOFMEMORY;
    }

    return punk;

} // CreateInstance


//
// Constructor
//
CContrastProperties::CContrastProperties(LPUNKNOWN pUnk, HRESULT *phr) :
    CBasePropertyPage(NAME("Contrast Property Page"), pUnk,
                      IDD_CONTRASTPROP, IDS_TITLE),
    m_pContrast(NULL)
{
    InitCommonControls();

} // (Constructor)


//
// SetDirty
//
// Sets m_bDirty and notifies the property page site of the change
//
void CContrastProperties::SetDirty()
{
    m_bDirty = TRUE;

    if(m_pPageSite)
    {
        m_pPageSite->OnStatusChange(PROPPAGESTATUS_DIRTY);
    }

} // SetDirty


//
// OnReceiveMessage
//
// Virtual method called by base class with Window messages
//
BOOL CContrastProperties::OnReceiveMessage(HWND hwnd,
                                           UINT uMsg,
                                           WPARAM wParam,
                                           LPARAM lParam)
{
    switch(uMsg)
    {
        case WM_INITDIALOG:
        {
            m_hwndSlider = CreateSlider(hwnd);
            ASSERT(m_hwndSlider);
            return (LRESULT) 1;
        }

        case WM_VSCROLL:
        {
            ASSERT(m_hwndSlider);
            OnSliderNotification(wParam);
            return (LRESULT) 1;
        }

        case WM_COMMAND:
        {
            if(LOWORD(wParam) == IDB_DEFAULT)
            {
                pIContrast()->put_DefaultContrastLevel();
                SendMessage(m_hwndSlider, TBM_SETPOS, TRUE, 0L);
                SetDirty();
            }
            return (LRESULT) 1;
        }

        case WM_DESTROY:
        {
            DestroyWindow(m_hwndSlider);
            return (LRESULT) 1;
        }

    }

    return CBasePropertyPage::OnReceiveMessage(hwnd,uMsg,wParam,lParam);

} // OnReceiveMessage


//
// OnConnect
//
// Called when the property page connects to a filter
//
HRESULT CContrastProperties::OnConnect(IUnknown *pUnknown)
{
    ASSERT(m_pContrast == NULL);
    CheckPointer(pUnknown,E_POINTER);

    HRESULT hr = pUnknown->QueryInterface(IID_IContrast, (void **) &m_pContrast);
    if(FAILED(hr))
    {
        return E_NOINTERFACE;
    }

    ASSERT(m_pContrast);

    // Get the initial contrast value
    m_pContrast->get_ContrastLevel(&m_cContrastLevel);
    m_cContrastOnExit = m_cContrastLevel;

    return NOERROR;

} // OnConnect


//
// OnDisconnect
//
// Called when we're disconnected from a filter
//
HRESULT CContrastProperties::OnDisconnect()
{
    // Release of Interface after setting the appropriate contrast value
    if (!m_pContrast)
        return E_UNEXPECTED;

    m_pContrast->put_ContrastLevel(m_cContrastOnExit, 0);
    m_pContrast->Release();
    m_pContrast = NULL;

    return NOERROR;

} // OnDisconnect


//
// OnDeactivate
//
// We are being deactivated
//
HRESULT CContrastProperties::OnDeactivate(void)
{
    // Remember the present contrast level for the next activate

    pIContrast()->get_ContrastLevel(&m_cContrastLevel);
    return NOERROR;

} // OnDeactivate


//
// OnApplyChanges
//
// Changes made should be kept. Change the m_cContrastOnExit variable
//
HRESULT CContrastProperties::OnApplyChanges()
{
    pIContrast()->get_ContrastLevel(&m_cContrastOnExit);
    m_bDirty = FALSE;
    return(NOERROR);

} // OnApplyChanges


//
// CreateSlider
//
// Create the slider (common control) to allow the user to adjust contrast
//
HWND CContrastProperties::CreateSlider(HWND hwndParent)
{
    ULONG Styles = WS_CHILD | WS_VISIBLE | WS_TABSTOP | TBS_VERT | TBS_BOTH | WS_GROUP;
    HWND hwndSlider = CreateWindow(TRACKBAR_CLASS, TEXT(""), Styles,
                                   62, 35, 39, 100,
                                   hwndParent, NULL, g_hInst, NULL);
    if(hwndSlider == NULL)
    {
        // DWORD dwErr = GetLastError();
        return NULL;
    }

    // Set the initial range for the slider
    SendMessage(hwndSlider, TBM_SETRANGE, TRUE, 
                MAKELONG(MinContrastLevel, MaxContrastLevel));

    // Set a tick at zero
    SendMessage(hwndSlider, TBM_SETTIC, 0, 0L);

    // Set the initial slider position
    SendMessage(hwndSlider, TBM_SETPOS, TRUE, m_cContrastLevel);

    return hwndSlider;

} // CreateSlider


//
// OnSliderNotification
//
// Handle the notification messages from the slider control
//
void CContrastProperties::OnSliderNotification(WPARAM wParam)
{
    switch(wParam)
    {
        case TB_BOTTOM:
            SetDirty();
            SendMessage(m_hwndSlider, TBM_SETPOS, TRUE, (LPARAM) MinContrastLevel);
            break;

        case TB_TOP:
            SetDirty();
            SendMessage(m_hwndSlider, TBM_SETPOS, TRUE, (LPARAM) MaxContrastLevel);
            break;

        case TB_PAGEDOWN:
        case TB_PAGEUP:
            break;

        case TB_THUMBPOSITION:
        case TB_ENDTRACK:
        {
            SetDirty();
            signed char Level = (signed char) 
                    SendMessage(m_hwndSlider, TBM_GETPOS, 0, 0L);
            pIContrast()->put_ContrastLevel(Level, 0);
            break;
        }

        // Default handling of these messages is ok
        case TB_THUMBTRACK:
        case TB_LINEDOWN:
        case TB_LINEUP:
            break;
    }

} // OnSliderNotification


