Windows-classic-samples/Samples/Win7Samples/multimedia/WindowsAnimation/TimerDriven/MainWindow.cpp

// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (c) Microsoft Corporation. All rights reserved


#include "MainWindow.h"
#include "TimerEventHandler.h"
#include "UIAnimationSample.h"

#include <UXTheme.h>

using namespace Gdiplus;

const DOUBLE COLOR_MIN = 0.0;
const DOUBLE COLOR_MAX = 255.0;

CMainWindow::CMainWindow() :
    m_hwnd(NULL),
    m_pAnimationManager(NULL),
    m_pAnimationTimer(NULL),
    m_pTransitionLibrary(NULL),
    m_pAnimationVariableRed(NULL),
    m_pAnimationVariableGreen(NULL),
    m_pAnimationVariableBlue(NULL)
{
}

CMainWindow::~CMainWindow()
{
    // Animated Variables

    SafeRelease(&m_pAnimationVariableRed);
    SafeRelease(&m_pAnimationVariableGreen);
    SafeRelease(&m_pAnimationVariableBlue);

    // Animation

    SafeRelease(&m_pAnimationManager);
    SafeRelease(&m_pAnimationTimer);
    SafeRelease(&m_pTransitionLibrary);
}

// Creates the CMainWindow window

HRESULT CMainWindow::Initialize(
    HINSTANCE hInstance                            
    )
{
    // Register the window class

    WNDCLASSEX wcex = {sizeof(wcex)};
    wcex.style         = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc   = CMainWindow::WndProc;
    wcex.cbWndExtra    = sizeof(LONG_PTR);
    wcex.hInstance     = hInstance;
    wcex.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
    wcex.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wcex.lpszClassName = L"WAMMainWindow";

    RegisterClassEx(&wcex);

    // Create the CMainWindow window

    m_hwnd = CreateWindow(
        wcex.lpszClassName,
        L"Windows Animation - Timer-Driven Animation Demo",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        NULL,
        NULL,
        hInstance,
        this
        );
    HRESULT hr = m_hwnd ? S_OK : E_FAIL;
    if (SUCCEEDED(hr))
    {
        // Initialize Animation
        hr = InitializeAnimation();
        if (SUCCEEDED(hr))
        {
            hr = CreateAnimationVariables();
            if (SUCCEEDED(hr))
            {
                // Display the window
                ShowWindow(m_hwnd, SW_SHOWNORMAL);
                UpdateWindow(m_hwnd);

                // Fade in with Red
                hr = ChangeColor(COLOR_MAX, COLOR_MIN, COLOR_MIN);
            }
        }
    }

    return hr;
}

// Invalidates the client area for redrawing

HRESULT CMainWindow::Invalidate()
{
    BOOL bResult = InvalidateRect(
        m_hwnd,
        NULL,
        FALSE
        );
    
    HRESULT hr = bResult ? S_OK : E_FAIL;

    return hr;
}

// Creates and initializes the main animation components

HRESULT CMainWindow::InitializeAnimation()
{
    // Create Animation Manager

    HRESULT hr = CoCreateInstance(
        CLSID_UIAnimationManager,
        NULL,
        CLSCTX_INPROC_SERVER,
        IID_PPV_ARGS(&m_pAnimationManager)
        );
    if (SUCCEEDED(hr))
    {
        // Create Animation Timer

        hr = CoCreateInstance(
            CLSID_UIAnimationTimer,
            NULL,
            CLSCTX_INPROC_SERVER,
            IID_PPV_ARGS(&m_pAnimationTimer)
            );
        if (SUCCEEDED(hr))
        {
            // Create Animation Transition Library

            hr = CoCreateInstance(
                CLSID_UIAnimationTransitionLibrary,
                NULL,
                CLSCTX_INPROC_SERVER,
                IID_PPV_ARGS(&m_pTransitionLibrary)
                );
            if (SUCCEEDED(hr))
            {
                // Connect the animation manager to the timer.
                // UI_ANIMATION_IDLE_BEHAVIOR_DISABLE tells the timer to shut itself
                // off when there is nothing to animate.

                IUIAnimationTimerUpdateHandler *pTimerUpdateHandler;
                hr = m_pAnimationManager->QueryInterface(
                    IID_PPV_ARGS(&pTimerUpdateHandler)
                    );
                if (SUCCEEDED(hr))
                {
                    hr = m_pAnimationTimer->SetTimerUpdateHandler(
                        pTimerUpdateHandler,
                        UI_ANIMATION_IDLE_BEHAVIOR_DISABLE
                        );
                    pTimerUpdateHandler->Release();
                    if (SUCCEEDED(hr))
                    {
                        // Create and set the Timer Event Handler

                        IUIAnimationTimerEventHandler *pTimerEventHandler;
                        hr = CTimerEventHandler::CreateInstance(
                            this,
                            &pTimerEventHandler
                            );
                        if (SUCCEEDED(hr))
                        {
                            hr = m_pAnimationTimer->SetTimerEventHandler(
                                pTimerEventHandler
                                );
                            pTimerEventHandler->Release();
                        }
                    }
                }
            }
        }
    }
    
    return hr;
}

// Creates the RGB animation variables for the background color

HRESULT CMainWindow::CreateAnimationVariables()
{
    const DOUBLE INITIAL_RED = COLOR_MAX;
    const DOUBLE INITIAL_GREEN = COLOR_MAX;
    const DOUBLE INITIAL_BLUE = COLOR_MAX;

    HRESULT hr = m_pAnimationManager->CreateAnimationVariable(
        INITIAL_RED,
        &m_pAnimationVariableRed
        );
    if (SUCCEEDED(hr))
    {
        hr = m_pAnimationVariableRed->SetLowerBound(COLOR_MIN);
        if (SUCCEEDED(hr))
        {
            hr = m_pAnimationVariableRed->SetUpperBound(COLOR_MAX);
            if (SUCCEEDED(hr))
            {
                hr = m_pAnimationManager->CreateAnimationVariable(
                    INITIAL_GREEN,
                    &m_pAnimationVariableGreen
                    );
                if (SUCCEEDED(hr))
                {
                    hr = m_pAnimationVariableGreen->SetLowerBound(COLOR_MIN);
                    if (SUCCEEDED(hr))
                    {
                        hr = m_pAnimationVariableGreen->SetUpperBound(COLOR_MAX);
                        if (SUCCEEDED(hr))
                        {
                            hr = m_pAnimationManager->CreateAnimationVariable(
                                INITIAL_BLUE,
                                &m_pAnimationVariableBlue
                                );
                            if (SUCCEEDED(hr))
                            {
                                hr = m_pAnimationVariableBlue->SetLowerBound(COLOR_MIN);
                                if (SUCCEEDED(hr))
                                {
                                    hr = m_pAnimationVariableBlue->SetUpperBound(COLOR_MAX);
                                }
                            }
                        }
                    }
                }
            }
        }
    }
    
    return hr;
}

// The window message handler

LRESULT CALLBACK CMainWindow::WndProc(
    HWND hwnd,
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam
    )
{
    const int MESSAGE_PROCESSED = 0;

    if (uMsg == WM_CREATE)
    {
        LPCREATESTRUCT pcs = (LPCREATESTRUCT)lParam;
        CMainWindow *pMainWindow = (CMainWindow *)pcs->lpCreateParams;

        SetWindowLongPtrW(
            hwnd,
            GWLP_USERDATA,
            PtrToUlong(pMainWindow)
            );

        return MESSAGE_PROCESSED;
    }

    CMainWindow *pMainWindow = reinterpret_cast<CMainWindow *>(static_cast<LONG_PTR>(
        GetWindowLongPtrW(
            hwnd,
            GWLP_USERDATA
            )));

    if (pMainWindow != NULL)
    {
        switch (uMsg)
        {
        case WM_LBUTTONDOWN:
            {
                pMainWindow->OnLButtonDown();
            }
            return MESSAGE_PROCESSED;

        case WM_PAINT:
        case WM_DISPLAYCHANGE:
            {
                PAINTSTRUCT ps;
                BeginPaint(
                    hwnd,
                    &ps
                    );

                pMainWindow->OnPaint(
                    ps.hdc,
                    ps.rcPaint
                    );

                EndPaint(
                    hwnd,
                    &ps
                    );
            }
            return MESSAGE_PROCESSED;

        case WM_DESTROY:
            {
                pMainWindow->OnDestroy();
            
                PostQuitMessage(
                    0
                    );
            }
            return MESSAGE_PROCESSED;
        }
    }
    return DefWindowProc(
        hwnd,
        uMsg,
        wParam,
        lParam
        );
}

//  Called whenever the client area needs to be drawn

HRESULT CMainWindow::OnPaint(
    HDC hdc,
    const RECT &rcPaint
    )
{
    HRESULT hr = S_OK;

    HDC hdcBuffer;
    HPAINTBUFFER hpb = BeginBufferedPaint(
        hdc,
        &rcPaint,
        BPBF_COMPATIBLEBITMAP, 
        NULL,
        &hdcBuffer
        );
    if (hpb)
    {
        hr = DrawClientArea(
            hdcBuffer,
            rcPaint
            );

        // Can only return one failure HRESULT
        HRESULT hrEndDraw = EndBufferedPaint(
            hpb,
            TRUE
            );
        if (SUCCEEDED(hr))
        {
            hr = hrEndDraw;
        }
    }
    else
    {
        // An error occurred, default to unbuffered painting
        
        hr = DrawClientArea(
            hdc,
            rcPaint
            );
    }

    return hr;
}

// When the left mouse button is clicked on the client area, schedule
// animations to change the background color of the window

HRESULT CMainWindow::OnLButtonDown()
{
    HRESULT hr = ChangeColor(
        RandomFromRange(COLOR_MIN, COLOR_MAX),
        RandomFromRange(COLOR_MIN, COLOR_MAX),
        RandomFromRange(COLOR_MIN, COLOR_MAX)
        );

    return hr; 
}

// Prepares for window destruction

void CMainWindow::OnDestroy()
{
    if (m_pAnimationTimer != NULL)
    {
        // Clear the timer event handler, to ensure that the one that points to this object is released
    
        (void)m_pAnimationTimer->SetTimerEventHandler(NULL);
    }
}

// Draws the contents of the client area

HRESULT CMainWindow::DrawClientArea(
    HDC hdc,
    const RECT &rcPaint
    )
{
    Graphics graphics(hdc);
    HRESULT hr = HrFromStatus(graphics.SetSmoothingMode(
        SmoothingModeAntiAlias
        ));
    if (SUCCEEDED(hr))
    {
        RectF rectPaint(
            static_cast<REAL>(rcPaint.left),
            static_cast<REAL>(rcPaint.top),
            static_cast<REAL>(rcPaint.right - rcPaint.left),
            static_cast<REAL>(rcPaint.bottom - rcPaint.top)
            );
    
        hr = DrawBackground(
            graphics,
            rectPaint
            );
    }
    
    return hr;
}

// Fills the background with the color specified by the animation variables

HRESULT CMainWindow::DrawBackground(
    Graphics &graphics,
    const RectF &rectPaint
    )
{
    // Get the RGB animation variable values

    INT32 red;
    HRESULT hr = m_pAnimationVariableRed->GetIntegerValue(
        &red
        );
    if (SUCCEEDED(hr))
    {
        INT32 green;
        hr = m_pAnimationVariableGreen->GetIntegerValue(
            &green
            );
        if (SUCCEEDED(hr))
        {
            INT32 blue;
            hr = m_pAnimationVariableBlue->GetIntegerValue(
                &blue
                );
            if (SUCCEEDED(hr))
            {
                // Set the RGB of the background brush to the new animated value

                SolidBrush brushBackground(Color(
                    static_cast<BYTE>(red),
                    static_cast<BYTE>(green),
                    static_cast<BYTE>(blue)
                    ));

                // Paint the background

                hr = HrFromStatus(graphics.FillRectangle(
                    &brushBackground,
                    rectPaint
                    ));
            }
        }
    }
    
    return hr;
}

// Animates the background color to a new value

HRESULT CMainWindow::ChangeColor(
    DOUBLE red,
    DOUBLE green,
    DOUBLE blue
    )
{
    const UI_ANIMATION_SECONDS DURATION = 0.5;
    const DOUBLE ACCELERATION_RATIO = 0.5;
    const DOUBLE DECELERATION_RATIO = 0.5;

    // Create a storyboard

    IUIAnimationStoryboard *pStoryboard = NULL;
    HRESULT hr = m_pAnimationManager->CreateStoryboard(
        &pStoryboard
        );
    if (SUCCEEDED(hr))
    {
        // Create transitions for the RGB animation variables

        IUIAnimationTransition *pTransitionRed;
        hr = m_pTransitionLibrary->CreateAccelerateDecelerateTransition(
            DURATION,
            red,
            ACCELERATION_RATIO,
            DECELERATION_RATIO,
            &pTransitionRed
            );
        if (SUCCEEDED(hr))
        {
            IUIAnimationTransition *pTransitionGreen;
            hr = m_pTransitionLibrary->CreateAccelerateDecelerateTransition(
                DURATION,
                green,
                ACCELERATION_RATIO,
                DECELERATION_RATIO,
                &pTransitionGreen
                );
            if (SUCCEEDED(hr))
            {
                IUIAnimationTransition *pTransitionBlue;
                hr = m_pTransitionLibrary->CreateAccelerateDecelerateTransition(
                    DURATION,
                    blue,
                    ACCELERATION_RATIO,
                    DECELERATION_RATIO,
                    &pTransitionBlue
                    );
                if (SUCCEEDED(hr))
                {
                    // Add transitions to the storyboard

                    hr = pStoryboard->AddTransition(
                        m_pAnimationVariableRed,
                        pTransitionRed
                        );
                    if (SUCCEEDED(hr))
                    {
                        hr = pStoryboard->AddTransition(
                            m_pAnimationVariableGreen,
                            pTransitionGreen
                            );
                        if (SUCCEEDED(hr))
                        {
                            hr = pStoryboard->AddTransition(
                                m_pAnimationVariableBlue,
                                pTransitionBlue
                                );
                            if (SUCCEEDED(hr))
                            {
                                // Get the current time and schedule the storyboard for play

                                UI_ANIMATION_SECONDS secondsNow;
                                hr = m_pAnimationTimer->GetTime(
                                    &secondsNow
                                    );
                                if (SUCCEEDED(hr))
                                {
                                    hr = pStoryboard->Schedule(
                                        secondsNow
                                        );
                                }
                            }
                        }
                    }

                    pTransitionBlue->Release();
                }

                pTransitionGreen->Release();
            }

            pTransitionRed->Release();
        }

        pStoryboard->Release();
    }

    return hr;
}

// Generate a random value in the given range

DOUBLE CMainWindow::RandomFromRange(
    DOUBLE minimum,
    DOUBLE maximum
    )
{
     return minimum + (maximum - minimum) * rand() / RAND_MAX;
}

// Convert a GDI+ Status to an HRESULT
        
HRESULT CMainWindow::HrFromStatus(
    Status status
    )
{
    return (status == Ok ? S_OK : E_FAIL);
}