Animieren der Bitmap eines über ebenen untergeordneten Fensters

Hinweis

Für Apps auf Windows 10 empfehlen wir die Verwendung von Windows.UI.Composition-APIs anstelle von DirectComposition. Weitere Informationen finden Sie unter Modernisieren Ihrer Desktop-App mithilfe der visuellen Ebene.

In diesem Thema wird beschrieben, wie Sie ein Visual erstellen und animieren, das die Bitmap eines über ebenen untergeordneten Fensters als Inhalt des Visuals verwendet. Das in diesem Thema beschriebene Beispiel verwendet eine animierte Skalierungstransformation, um die Bitmap eines untergeordneten Fensters von der Primgröße bis zur vollständigen Größe zu "vergrößern". Weitere Informationen zu mehrschichtigen Fenstern finden Sie unter Fensterbitmaps.

Wichtige Informationen

Technologien

Voraussetzungen

  • C/C++
  • Microsoft Win32
  • Component Object Model (COM)

Anweisungen

Schritt 1: Erstellen eines über ebenen untergeordneten Fensters

Führen Sie die folgenden Schritte aus, um ein untergeordnetes Mehrebenenfenster zu erstellen.

  1. Registrieren Sie die untergeordnete Fensterklasse, und erstellen Sie ein untergeordnetes Fenster mit dem Format WS _ EX _ LAYERED. Geben Sie im folgenden Beispiel die Bildschirmauflösung in Pixel pro logischem Zoll an, und ist das Handle m_dpiX m_dpiY des m_hwndMain Hauptanwendungsfensters.
    HWND m_hwndLayeredChild;

    
HRESULT hr = S_OK;

    WNDCLASSEXW wcex;
    wcex.cbSize         = sizeof(wcex);
    wcex.style          = 0;
    wcex.lpfnWndProc    = DemoApp::ChildWndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = HINST_THISCOMPONENT;
    wcex.hIcon          = NULL;
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH) GetStockObject(GRAY_BRUSH);
    wcex.lpszMenuName   = NULL;
    wcex.lpszClassName  = L"DCompLayeredChildWindow";
    wcex.hIconSm        = NULL;

    if (!RegisterClassExW(&wcex))
    {
        return FALSE;
    }

    m_hwndLayeredChild = CreateWindowEx(WS_EX_LAYERED,
        L"DCompLayeredChildWindow",
        NULL,
        WS_CHILD | WS_CLIPSIBLINGS,
        0,
        0,
        static_cast<UINT>(ceil(640.0f * m_dpiX / 96.0f)),
        static_cast<UINT>(ceil(480.0f * m_dpiY / 96.0f)),
        m_hwndMain,
        NULL,
        HINST_THISCOMPONENT,
        this);
  1. Rufen Sie die Funktion SetLayeredWindowAttributes auf, um den Transparenzfarbschlüssel und die Deckkraft des über ebenen untergeordneten Fensters zu setzen. Der folgende Code legt den Transparenzfarbschlüssel auf 0 und die Deckkraft auf 255 (nicht transparent) fest.
    if (!SetLayeredWindowAttributes(m_hwndLayeredChild, 0, 255, LWA_ALPHA))
    {
        hr = HRESULT_FROM_WIN32(GetLastError());
    }
  1. Rendern Sie Inhalte im untergeordneten Fenster.

Schritt 2: Initialisieren von DirectComposition-Objekten

Erstellen Sie das Geräteobjekt und das Kompositionszielobjekt. Weitere Informationen finden Sie unter Initialisieren von DirectComposition.

Schritt 3: Erstellen eines visuellen Objekts und Festlegen der Bitmap des über ebenen untergeordneten Fensters als Inhaltseigenschaft

Führen Sie die folgenden Schritte aus, um ein Visual zu erstellen, dessen Inhaltseigenschaft auf die Verwendung der Bitmap des über ebenen untergeordneten Fensters zu setzen, und fügen Sie das Visual dann der visuellen Struktur hinzu.

  1. Rufen Sie IDCompositionDevice::CreateVisual auf, um ein visuelles Objekt zu erstellen.
  2. Erstellen Sie eine Microsoft DirectComposition-Oberfläche für das über ebenen untergeordnete Fenster, indem Sie das Handle des untergeordneten Fensters an die CreateSurfaceFromHwnd-Funktion übergeben.
  3. Rufen Sie die IDCompositionVisual::SetContent-Methode des visuellen Objekts auf, um die neue Oberfläche als visuellen Inhalt des über ebenen untergeordneten Fensters zu setzen.
  4. Fügen Sie das visuelle Objekt der visuellen Struktur hinzu. Um das Visual dem Stamm der Struktur hinzuzufügen, rufen Sie die IDCompositionTarget::SetRoot-Methode auf. Um das Visual als untergeordnetes Element eines anderen Visuals hinzuzufügen, verwenden Sie die IDCompositionVisual::AddVisual-Methode des übergeordneten Visuals.

Im folgenden Beispiel wird ein visuelles Objekt erstellt, dessen Content-Eigenschaft auf die Verwendung der Bitmap des über ebenen untergeordneten Fensters und das Visual zum Stamm der visuellen Struktur addiert.

IDCompositionVisual *pVisual = nullptr;
IUnknown* pSurface    = nullptr;

hr = m_pDevice->CreateVisual(&pVisual);
if (SUCCEEDED(hr))
{
    hr = m_pDevice->CreateSurfaceFromHwnd(m_hwndLayeredChild, &pSurface);
}

if (SUCCEEDED(hr))
{
    hr = pVisual->SetContent(pSurface);
}

if (SUCCEEDED(hr))
{
    hr = m_pCompTarget->SetRoot(pVisual);
}

Schritt 4: Erstellen eines Animationsobjekts und eines Skalierungstransformationsobjekts

Verwenden Sie die IDCompositionDevice::CreateAnimation-Methode, um ein Animationsobjekt zu erstellen, und die IDCompositionDevice::CreateScaleTransform-Methode, um ein Skalierungstransformationsobjekt zu erstellen.

IDCompositionAnimation *pAnimateScale = NULL;
IDCompositionScaleTransform *pScale = NULL;

if (SUCCEEDED(hr))
{
    hr = m_pDevice->CreateAnimation(&pAnimateScale);
}

if (SUCCEEDED(hr))
{
    // Create the scale transform object.
    hr = m_pDevice->CreateScaleTransform(&pScale);
}

Schritt 5: Erstellen der Animationsfunktion

Verwenden Sie die Methoden der IDCompositionAnimation-Schnittstelle des Animationsobjekts, um eine Animationsfunktion zu erstellen.

Im folgenden Beispiel wird eine einfache Animationsfunktion erstellt, die aus einem kubischen polynomialen Segment und einem Endsegment besteht.

pAnimateScale->AddCubic(
    0.0f,  // offset from beginning of animation function, in seconds
    0.0f,  // constant coefficient  
    1.0f,  // linear coefficient
    0.0f,  // quadratic coefficient
    0.0f); // cubic coefficient
pAnimateScale->End(1.0f, 1.0f);

Schritt 6: Anwenden des Animationsobjekts auf Eigenschaften des Skalierungstransformationsobjekts

Verwenden Sie die Methoden IDCompositionScale::SetScaleX und SetScaleY, um das Animationsobjekt auf die ScaleX- und ScaleY-Eigenschaften des Skalierungstransformationsobjekts anzuwenden.

// Find the center of the child window.
RECT rcChild = { };
GetClientRect(m_hwndLayeredChild, &rcChild);
float centerX = rcChild.right / 2.0f;
float centerY = rcChild.bottom / 2.0f;

// Scale from the center point of the child window's bitmap.
pScale->SetCenterX(centerX);
pScale->SetCenterY(centerY);

// Use the same animation object to animate the X and Y scale
// factors.
pScale->SetScaleX(pAnimateScale);
pScale->SetScaleY(pAnimateScale);

Schritt 7: Anwenden des Skalierungstransformationsobjekts auf die Transformationseigenschaft des Visuals

Verwenden Sie die IDCompositionVisual::SetTransform-Methode, um das Skalierungstransformationsobjekt auf die Transform-Eigenschaft des Visuals anzuwenden.

hr = pVisual->SetTransform(pScale);

Schritt 8: Verkleinern des über ebenen untergeordneten Fensters

Verwenden Sie vor dem Committen der Animation die DwmSetWindowAttribute-Funktion mit dem DWMWA _ CLOAK-Flag, um das über ebenen untergeordnete Fenster zu "verkleinern". Durch das Verkleinern wird das über ebenen untergeordnete Fenster aus der Ansicht entfernt, während die animierte Version der Bitmapansicht des Fensters auf dem Bildschirm gerendert wird.

BOOL fCloak = TRUE;
DwmSetWindowAttribute(pDemoApp->m_hwndLayeredChild,
    DWMWA_CLOAK,
    &fCloak,
    sizeof(fCloak));

Schritt 9: Commit der Komposition

Verwenden Sie die IDCompositionDevice::Commit-Methode, um den Batch von Befehlen zur Verarbeitung an Microsoft DirectComposition zu commiten. Die Animation wird im Zielfenster angezeigt.

Schritt 10: Entschärfen des über ebenen untergeordneten Fensters

Nachdem die Animation abgeschlossen ist, verwenden Sie die DwmSetWindowAttribute-Funktion mit dem DWMWA _ CLOAK-Flag, um das überschichtige untergeordnete Fenster zu entloaken.

Schritt 11: Veröffentlichen von DirectComposition-Objekten

Stellen Sie sicher, dass Sie alle DirectComposition-Objekte veröffentlichen, wenn Sie sie nicht mehr benötigen. Das folgende Beispiel ruft das anwendungsdefinierte SafeRelease-Makro auf, um die DirectComposition-Objekte frei zu geben.

SafeRelease(&pVisual);
SafeRelease(&pAnimateScale);
SafeRelease(&pScale);


SafeRelease(&m_pDevice);
SafeRelease(&m_pCompTarget);

Vollständiges Beispiel

//
// AnimateLayeredChildWindow.h
//
// 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

#pragma once
// Modify the following definitions if you need to target a platform prior to the ones specified below.
// Refer to MSDN for the latest info on corresponding values for different platforms.
#ifndef WINVER              // Allow use of features specific to Windows 7 or later.
#define WINVER 0x0700       // Change this to the appropriate value to target other versions of Windows.
#endif

#ifndef _WIN32_WINNT        // Allow use of features specific to Windows 7 or later.
#define _WIN32_WINNT 0x0700 // Change this to the appropriate value to target other versions of Windows.
#endif

#ifndef UNICODE
#define UNICODE
#endif

#define WIN32_LEAN_AND_MEAN     // Exclude rarely-used items from Windows headers

// Windows Header Files:
#include <windows.h>
#include <wincodec.h>

// C RunTime Header Files
#include <math.h>

// DirectComposition Header File
#include <dcomp.h>

// Direct2D Header Files
#include <d2d1.h>
#include <d2d1helper.h>

// Desktop Window Manager (DWM) Header File
#include <dwmapi.h>


/******************************************************************
*                                                                 *
*  Macros                                                         *
*                                                                 *
******************************************************************/
template<class Interface>
inline void
SafeRelease(
    Interface **ppInterfaceToRelease
    )
{
    if (*ppInterfaceToRelease != NULL)
    {
        (*ppInterfaceToRelease)->Release();

        (*ppInterfaceToRelease) = NULL;
    }
}

#ifndef HINST_THISCOMPONENT
EXTERN_C IMAGE_DOS_HEADER __ImageBase;
#define HINST_THISCOMPONENT ((HINSTANCE)&__ImageBase)
#endif

/******************************************************************
*                                                                 *
*  DemoApp                                                        *
*                                                                 *
******************************************************************/

class DemoApp
{
public:
    DemoApp();
    ~DemoApp();

    HRESULT InitializeMainWindow();
    HRESULT InitializeLayeredChildWindow();

    void RunMessageLoop();

private:
    HRESULT InitializeDirectCompositionObjects();

    HRESULT CreateDeviceIndependentResources();
    HRESULT CreateDeviceResources();
    void DiscardDeviceResources();

    HRESULT OnChildClick();
    HRESULT OnChildRender();

    HRESULT LoadResourceD2DBitmap(
        ID2D1RenderTarget *pRenderTarget,
        IWICImagingFactory *pIWICFactory,
        PCWSTR resourceName,
        PCWSTR resourceType,
        ID2D1Bitmap **ppBitmap
        );

    static LRESULT CALLBACK MainWndProc(
        HWND hWnd,
        UINT message,
        WPARAM wParam,
        LPARAM lParam
        );

    static LRESULT CALLBACK ChildWndProc(
        HWND hWnd,
        UINT message,
        WPARAM wParam,
        LPARAM lParam
        );
    
 private:
    int m_dpiX;
    int m_dpiY;
    int m_childOffsetX;
    int m_childOffsetY;

    HWND m_hwndMain;
    HWND m_hwndLayeredChild;

    IDCompositionDevice *m_pDevice;
    IDCompositionTarget *m_pCompTarget;
    ID2D1HwndRenderTarget *m_pRenderTarget;
    ID2D1Factory *m_pD2DFactory;
    ID2D1Bitmap *m_pBitmap;
    IWICImagingFactory *m_pWICFactory;

 };


//
// AnimateLayeredChildWindow.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

// Instructions: Click the thumnail image to animate the transition
//   of the child window from thumbsize to fullsize. Click the child
//   window again to reset.

#include "AnimateLayeredChildWindow.h"

#define TIMER_ID 100

/******************************************************************
*                                                                 *
*  The application entry point.                                   *
*                                                                 *
******************************************************************/

int WINAPI WinMain(
    HINSTANCE   /* hInstance */,
    HINSTANCE   /* hPrevInstance */,
    LPSTR       /* lpCmdLine */,
    int         /* nCmdShow */
    )
{
    // Ignore the return value because we want to run the program even in the
    // unlikely event that HeapSetInformation fails.
    HeapSetInformation(NULL, HeapEnableTerminationOnCorruption, NULL, 0);
    if (SUCCEEDED(CoInitialize(NULL)))
    {
        {
            DemoApp app;

            if (SUCCEEDED(app.InitializeMainWindow()) && SUCCEEDED(app.InitializeLayeredChildWindow()))
            {
                app.RunMessageLoop();
            }
        }
        CoUninitialize();
    }

    return 0;
}

/******************************************************************
*                                                                 *
*  DemoApp::DemoApp constructor                                   *
*                                                                 *
*  Initialize member data.                                        *
*                                                                 *
******************************************************************/

DemoApp::DemoApp() :
    m_dpiX(0),
    m_dpiY(0),
    m_childOffsetX(20),
    m_childOffsetY(40),
    m_hwndMain(NULL),
    m_hwndLayeredChild(NULL),
    m_pDevice(NULL),
    m_pCompTarget(NULL),
    m_pRenderTarget(NULL),
    m_pBitmap(NULL),
    m_pD2DFactory(NULL),
    m_pWICFactory(NULL)
{
}

/******************************************************************
*                                                                 *
*  Release resources.                                             *
*                                                                 *
******************************************************************/

DemoApp::~DemoApp()
{
    SafeRelease(&m_pDevice);
    SafeRelease(&m_pCompTarget);
    SafeRelease(&m_pRenderTarget);
    SafeRelease(&m_pBitmap),
    SafeRelease(&m_pD2DFactory);
    SafeRelease(&m_pWICFactory);
}

/*******************************************************************
*                                                                  *
*  Create the application window.                                  *
*                                                                  *
*******************************************************************/

HRESULT DemoApp::InitializeMainWindow()
{
    HRESULT hr = S_OK;

    // Initialize device-independent resources, such 
    // as the Direct2D factory.
    hr = CreateDeviceIndependentResources();
    if (SUCCEEDED(hr))
    {
        // Register the main window class.
        WNDCLASSEX wcex = { sizeof(WNDCLASSEX) };
        wcex.style         = 0;
        wcex.lpfnWndProc   = DemoApp::MainWndProc;
        wcex.cbClsExtra    = 0;
        wcex.cbWndExtra    = sizeof(LONG_PTR);
        wcex.hInstance     = HINST_THISCOMPONENT;
        wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
        wcex.lpszMenuName  = NULL;
        wcex.hCursor       = LoadCursor(NULL, IDC_ARROW);
        wcex.lpszClassName = L"DirectCompDemoApp";

        RegisterClassEx(&wcex);

        RECT rect = { };
        SetRect(&rect, 0, 0, 640, 480);
        AdjustWindowRect(&rect, WS_OVERLAPPED | WS_SYSMENU, FALSE); 

        // Create the main application window.
        //

        // Because the CreateWindow function takes its size in pixels, we
        // obtain the system DPI and use it to scale the window size.
        HDC hdc = GetDC(NULL);
        if (hdc)
        {
            m_dpiX = GetDeviceCaps(hdc, LOGPIXELSX);
            m_dpiY = GetDeviceCaps(hdc, LOGPIXELSY);
            ReleaseDC(NULL, hdc);
        }

        float width = static_cast<float>(rect.right - rect.left);
        float height = static_cast<float>(rect.bottom - rect.top);

        m_hwndMain = CreateWindow(
            L"DirectCompDemoApp",
            L"DirectComposition Demo Application",
            WS_OVERLAPPED | WS_SYSMENU,
            CW_USEDEFAULT,
            CW_USEDEFAULT,
            static_cast<UINT>(ceil(width * m_dpiX / 96.f)),
            static_cast<UINT>(ceil(height * m_dpiY / 96.f)),
            NULL,
            NULL,
            HINST_THISCOMPONENT,
            this
            );
    }

    hr = m_hwndMain ? S_OK : E_FAIL;
    if (SUCCEEDED(hr))
    {
        // Create and initialize the DirectCompositoin objects.
        hr =  InitializeDirectCompositionObjects();
    }

    if (SUCCEEDED(hr))
    {
        ShowWindow(m_hwndMain, SW_SHOWNORMAL);
        UpdateWindow(m_hwndMain);
    }
  
    return hr;
}

/*******************************************************************
*                                                                  *
* Create the layered child window.                                 *
*                                                                  *
/******************************************************************/

HRESULT DemoApp::InitializeLayeredChildWindow()
{
    int thumbWidth = 48;
    int thumbHeight = 32;

    HRESULT hr = S_OK;

    WNDCLASSEXW wcex;
    wcex.cbSize         = sizeof(wcex);
    wcex.style          = 0;
    wcex.lpfnWndProc    = DemoApp::ChildWndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = HINST_THISCOMPONENT;
    wcex.hIcon          = NULL;
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH) GetStockObject (GRAY_BRUSH);
    wcex.lpszMenuName   = NULL;
    wcex.lpszClassName  = L"DCompLayeredChildWindow";
    wcex.hIconSm        = NULL;
    
    if (!RegisterClassExW(&wcex))
    {
        return FALSE;
    }

    m_hwndLayeredChild = CreateWindowEx(WS_EX_LAYERED,
        L"DCompLayeredChildWindow",
        NULL,
        WS_CHILD | WS_CLIPSIBLINGS,
        0,
        0,
        static_cast<UINT>(ceil(640.0f * m_dpiX / 96.0f)),
        static_cast<UINT>(ceil(480.0f * m_dpiY / 96.0f)),
        m_hwndMain,
        NULL,
        HINST_THISCOMPONENT,
        this);

    hr = m_hwndLayeredChild ? S_OK : E_FAIL;
    if (SUCCEEDED(hr))
    {
        // Set the opacity and transparency color key of the layered 
        // child window.
        if (!SetLayeredWindowAttributes(m_hwndLayeredChild, 0, 255, LWA_ALPHA))
        {
            hr = HRESULT_FROM_WIN32(GetLastError());
        }
    }

    if (SUCCEEDED(hr))
    {
        // While the child window is fullsize, load the bitmap resource and
        // render it to the child window.  
        hr = CreateDeviceResources(); 
    }
    
    if (SUCCEEDED(hr))
    {
        // Reduce the window to thumbsize.
        MoveWindow(m_hwndLayeredChild, m_childOffsetX, m_childOffsetY, 
            thumbWidth, thumbHeight, TRUE);
        ShowWindow(m_hwndLayeredChild, SW_SHOWNORMAL);
        UpdateWindow(m_hwndLayeredChild);
    }

    return hr;
}

/******************************************************************
*                                                                 *
*  This method creates the DirectComposition device object and    *
*  and the composition target object. These objects endure for    *
*  the lifetime of the application.                               *
*                                                                 *
******************************************************************/

HRESULT DemoApp::InitializeDirectCompositionObjects()
{
    HRESULT hr = S_OK;

    // Create a DirectComposition device object. 
    hr = DCompositionCreateDevice(nullptr, __uuidof(IDCompositionDevice), 
        reinterpret_cast<void**>(&m_pDevice));

    if (SUCCEEDED(hr))
    {
        // Create the composition target object.
        hr = m_pDevice->CreateTargetForHwnd(m_hwndMain, TRUE, &m_pCompTarget);   
    }

    return hr;
}


/******************************************************************
*                                                                 *
*  This method is used to create resources which are not bound    *
*  to any device. Their lifetime effectively extends for the      *
*  duration of the app.                                           *
*                                                                 *
******************************************************************/

HRESULT DemoApp::CreateDeviceIndependentResources()
{
    HRESULT hr = CoCreateInstance(
        CLSID_WICImagingFactory,
        NULL,
        CLSCTX_INPROC_SERVER,
        IID_PPV_ARGS(&m_pWICFactory)
        );

    if (SUCCEEDED(hr))
    {
        // Create a Direct2D factory.
        hr = D2D1CreateFactory(
            D2D1_FACTORY_TYPE_SINGLE_THREADED,
            &m_pD2DFactory
            );
    }

    return hr;
}

/******************************************************************
*                                                                 *
*  This method creates the D2D bitmap that the application gives  *
*  to DirectComposition to be composed.                           *
*                                                                 *
******************************************************************/

HRESULT DemoApp::CreateDeviceResources()
{
    HRESULT hr = S_OK;

    RECT rc;
    GetClientRect(m_hwndLayeredChild, &rc);

    D2D1_SIZE_U size = D2D1::SizeU(
        rc.right - rc.left,
        rc.bottom - rc.top
        );

    // Create a Direct2D render target.
    hr = m_pD2DFactory->CreateHwndRenderTarget(
        D2D1::RenderTargetProperties(),
        D2D1::HwndRenderTargetProperties(m_hwndLayeredChild, size),
        &m_pRenderTarget
        );

    if (SUCCEEDED(hr))
    {
        hr = LoadResourceD2DBitmap(
            m_pRenderTarget,
            m_pWICFactory,
            L"WhiteFlowers",
            L"Image",
            &m_pBitmap
            );
    }

    return hr;
}

/******************************************************************
*                                                                 *
*  Discard device-specific resources.                             *
*                                                                 *
******************************************************************/

void DemoApp::DiscardDeviceResources()
{
    SafeRelease(&m_pRenderTarget);
    SafeRelease(&m_pBitmap);
}

/******************************************************************
*                                                                 *
*  The main window&#39;s message loop.                                *
*                                                                 *
******************************************************************/

void DemoApp::RunMessageLoop()
{
    MSG msg;

    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
}

/******************************************************************
*                                                                 *
*  The main window&#39;s message handler.                             *
*                                                                 *
******************************************************************/

LRESULT CALLBACK DemoApp::MainWndProc(HWND hwnd, UINT message, 
    WPARAM wParam, LPARAM lParam)
{
    LRESULT result = 0;

    if (message == WM_CREATE)
    {
        LPCREATESTRUCT pcs = (LPCREATESTRUCT)lParam;
        DemoApp *pDemoApp = (DemoApp *)pcs->lpCreateParams;

        ::SetWindowLongPtrW(
            hwnd,
            GWLP_USERDATA,
            PtrToUlong(pDemoApp)
            );

        result = 1;
    }
    else
    {
        DemoApp *pDemoApp = reinterpret_cast<DemoApp *>(static_cast<LONG_PTR>(
            ::GetWindowLongPtrW(
                hwnd,
                GWLP_USERDATA
                )));

        bool wasHandled = false;

        if (pDemoApp)
        {
            switch (message)
            {
 
            case WM_DISPLAYCHANGE:
                {
                    InvalidateRect(hwnd, NULL, FALSE);
                }
                wasHandled = true;
                result = 0;
                break;

            case WM_DESTROY:
                {
                    PostQuitMessage(0);
                    pDemoApp->DiscardDeviceResources();
                }
                wasHandled = true;
                result = 1;
                break;
            }
        }

        if (!wasHandled)
        {
            result = DefWindowProc(hwnd, message, wParam, lParam);
        }
    }

    return result;
}

/******************************************************************
*                                                                 *
*  The layered child window&#39;s message handler.                    *
*                                                                 *
******************************************************************/

LRESULT CALLBACK DemoApp::ChildWndProc(HWND hwnd, UINT message, 
    WPARAM wParam, LPARAM lParam)
{
    LRESULT result = 0;

    if (message == WM_CREATE)
    {
        LPCREATESTRUCT pcs = (LPCREATESTRUCT)lParam;
        DemoApp *pDemoApp = (DemoApp *)pcs->lpCreateParams;

        ::SetWindowLongPtrW(
            hwnd,
            GWLP_USERDATA,
            PtrToUlong(pDemoApp)
            );

        result = 1;
    }
    else
    {
        DemoApp *pDemoApp = reinterpret_cast<DemoApp *>(static_cast<LONG_PTR>(
            ::GetWindowLongPtrW(
                hwnd,
                GWLP_USERDATA
                )));

        bool wasHandled = false;

        if (pDemoApp)
        {
            switch (message)
            {
            case WM_PAINT:
                {
                    pDemoApp->OnChildRender();
                    ValidateRect(hwnd, NULL);
                }
                wasHandled = true;
                result = 0;
                break;

            case WM_LBUTTONDOWN:
                {
                    HRESULT hr = S_OK;
                    static BOOL fThumbsize = TRUE;

                    // If the child window is already fullsize, reset
                    // the visual tree and return the child window
                    // to thumbsize and move it to its initial location.
                    if (!fThumbsize)
                    {
                        pDemoApp->m_pCompTarget->SetRoot(NULL);
                        hr = pDemoApp->m_pDevice->Commit();  

                        MoveWindow(pDemoApp->m_hwndLayeredChild, 
                            pDemoApp->m_childOffsetX, 
                            pDemoApp->m_childOffsetY, 48, 32, TRUE);

                        pDemoApp->OnChildRender();
                    }   
                    else
                    {
                        // Cloak the child window.
                        BOOL fCloak = TRUE;
                        DwmSetWindowAttribute(pDemoApp->m_hwndLayeredChild,
                            DWMWA_CLOAK,
                            &fCloak,
                            sizeof(fCloak));

                        pDemoApp->OnChildClick();
                    }                    
                    fThumbsize = !fThumbsize;
                }
                wasHandled = true;
                result = 0;
                break;

            case WM_TIMER:
                {
                    // Uncloak the child window.
                    BOOL fCloak = FALSE;
                    DwmSetWindowAttribute(pDemoApp->m_hwndLayeredChild,
                        DWMWA_CLOAK,
                        &fCloak,
                        sizeof(fCloak)); 
                    KillTimer(pDemoApp->m_hwndLayeredChild, TIMER_ID);
                }
                wasHandled = true;
                result = 0;
                break;
            }
        }

        if (!wasHandled)
        {
            result = DefWindowProc(hwnd, message, wParam, lParam);
        }
    }

    return result;
}


/******************************************************************
*                                                                 *
*  Draws a bitmap in the layered child window.                    *
*                                                                 *
******************************************************************/

HRESULT DemoApp::OnChildRender()
{
    HRESULT hr = S_OK;
 
    // Retrieve the size of the render target.
    D2D1_SIZE_F size = m_pRenderTarget->GetSize();
    
    m_pRenderTarget->BeginDraw();
    
    // Draw a bitmap scaled to fill the window.
    m_pRenderTarget->DrawBitmap(
        m_pBitmap,
        D2D1::RectF(0.0f, 0.0f, size.width, size.height)
        );

    hr = m_pRenderTarget->EndDraw();

    if (hr == D2DERR_RECREATE_TARGET)
    {
        hr = S_OK;
        DiscardDeviceResources();
    }

    return hr;
}

/******************************************************************
*                                                                 *
*  Handles a mouse click in the layered child window by animating *
*  the transition from a thumbsize window to a fullsize window.   *
*                                                                 *
******************************************************************/

HRESULT DemoApp::OnChildClick()
{
    int fullWidth = 640;
    int fullHeight = 480;
    HRESULT hr = S_OK;

    IDCompositionVisual *pVisual = nullptr;
    IUnknown* pSurface    = nullptr;

    hr = m_pDevice->CreateVisual(&pVisual);
    if (SUCCEEDED(hr))
    {
        hr = m_pDevice->CreateSurfaceFromHwnd(m_hwndLayeredChild, &pSurface);
    }

    if (SUCCEEDED(hr))
    {
        hr = pVisual->SetContent(pSurface);
    }

    if (SUCCEEDED(hr))
    {
        hr = m_pCompTarget->SetRoot(pVisual);
    }

    if (SUCCEEDED(hr))
    {
       // Position the visual at the same location as the
       // the child window.
        hr = pVisual->SetOffsetX(static_cast<float>(m_childOffsetX));
        if (SUCCEEDED(hr))
        {
            hr = pVisual->SetOffsetY(static_cast<float>(m_childOffsetY));  
        }
    }


    IDCompositionAnimation *pAnimateX = NULL;
    IDCompositionAnimation *pAnimateY = NULL;

    if (SUCCEEDED(hr))
    {
        // Create the animation objects.
        hr = m_pDevice->CreateAnimation(&pAnimateX);
        if (SUCCEEDED(hr))
        {
            hr = m_pDevice->CreateAnimation(&pAnimateY);
        }
    }

    IDCompositionAnimation *pAnimateScale = NULL;
    IDCompositionScaleTransform *pScale = NULL;

    if (SUCCEEDED(hr))
    {
        hr = m_pDevice->CreateAnimation(&pAnimateScale);
    }

    if (SUCCEEDED(hr))
    {
        // Create the scale transform object.
        hr = m_pDevice->CreateScaleTransform(&pScale);
    }

    if (SUCCEEDED(hr))
    {
        // Calculate the X and Y offsets that will position the child window 
        // in the center of the main window&#39;s client area.
        RECT rcParent = { };
        RECT rcChild = { };
        GetClientRect(m_hwndMain, &rcParent);
        GetClientRect(m_hwndLayeredChild, &rcChild);
        float endValX = rcParent.right / 2.0f - rcChild.right / 2.0f;
        float endValY = rcParent.bottom / 2.0f - rcChild.bottom / 2.0f;
 
        // Build the animation functions that will move the visual to the 
        // center of the main window&#39;s client area.
        pAnimateX->AddCubic(0.0f, static_cast<float>(m_childOffsetX), 
            endValX - m_childOffsetX, 0.0f, 0.0f);
        pAnimateX->End(0.9f, endValX);

        pAnimateY->AddCubic(0.0f, static_cast<float>(m_childOffsetY), 
            endValY - m_childOffsetY, 0.0f, 0.0f);
        pAnimateY->End(0.9f, endValY);

        // Associate the animation objects with the offset properties of 
        // the visual.
        hr = pVisual->SetOffsetX(pAnimateX);
        if (SUCCEEDED(hr))
        {
            hr = pVisual->SetOffsetY(pAnimateY);
        }
    }

    if (SUCCEEDED(hr))
    {
        // Commit the visual tree.
        hr = m_pDevice->Commit();  

        // Give the animation a chance to run.
        Sleep(900);
    }

    if (SUCCEEDED(hr))
    {
        // Align the visual with the upper-left corner of the
        // parent window&#39;s client area.
        pVisual->SetOffsetX(0.0);
        pVisual->SetOffsetY(0.0);

        // Enlarge the child window to fill the main window.
        if (!MoveWindow(m_hwndLayeredChild, 0, 0, fullWidth, fullHeight, TRUE))
        {
            hr = HRESULT_FROM_WIN32(GetLastError());
        }
    }

    if (SUCCEEDED(hr))
    {
        // Add animation primitives that define the animation object function 
        // used to scale up the child window&#39;s bitmap.
        pAnimateScale->AddCubic(
            0.0f,  // offset from beginning of animation function, in seconds
            0.0f,  // constant coefficient  
            1.0f,  // linear coefficient
            0.0f,  // quadratic coefficient
            0.0f); // cubic coefficient
        pAnimateScale->End(1.0f, 1.0f);

        // Find the center of the child window.
        RECT rcChild = { };
        GetClientRect(m_hwndLayeredChild, &rcChild);
        float centerX = rcChild.right / 2.0f;
        float centerY = rcChild.bottom / 2.0f;

        // Scale from the center point of the child window&#39;s bitmap.
        pScale->SetCenterX(centerX);
        pScale->SetCenterY(centerY);

        // Use the same animation object to animate the X and Y scale
        // factors.
        pScale->SetScaleX(pAnimateScale);
        pScale->SetScaleY(pAnimateScale);

        // Set the Transform property of the visual to use the scale 
        // transform.
        hr = pVisual->SetTransform(pScale);
    }
    
    if (SUCCEEDED(hr))
    {   // Commit the visual tree.
        hr = m_pDevice->Commit();  

        // Use a WM_TIMER message in the child window procedure 
        // to uncloak the child window. 
        SetTimer(m_hwndLayeredChild, TIMER_ID, 1000, NULL);
    }

    SafeRelease(&pAnimateX);
    SafeRelease(&pAnimateY);
    SafeRelease(&pVisual);
    SafeRelease(&pAnimateScale);
    SafeRelease(&pScale);
    
    return hr;
}


/******************************************************************
*                                                                 *
*  This method will create a Direct2D bitmap from an application  *
*  resource.                                                      *
*                                                                 *
******************************************************************/

HRESULT DemoApp::LoadResourceD2DBitmap(
    ID2D1RenderTarget *pRenderTarget,
    IWICImagingFactory *pIWICFactory,
    PCWSTR resourceName,
    PCWSTR resourceType,
    ID2D1Bitmap **ppBitmap
    )
{
    HRESULT hr = S_OK;
    IWICBitmapDecoder *pDecoder = NULL;
    IWICBitmapFrameDecode *pSource = NULL;
    IWICStream *pStream = NULL;
    IWICFormatConverter *pConverter = NULL;

    HRSRC imageResHandle = NULL;
    HGLOBAL imageResDataHandle = NULL;
    void *pImageFile = NULL;
    DWORD imageFileSize = 0;

    // Locate the resource.
    imageResHandle = FindResourceW(HINST_THISCOMPONENT, resourceName, resourceType);

    hr = imageResHandle ? S_OK : E_FAIL;
    if (SUCCEEDED(hr))
    {
        // Load the resource.
        imageResDataHandle = LoadResource(HINST_THISCOMPONENT, imageResHandle);

        hr = imageResDataHandle ? S_OK : E_FAIL;
    }

    if (SUCCEEDED(hr))
    {
        // Lock it to get a system memory pointer.
        pImageFile = LockResource(imageResDataHandle);

        hr = pImageFile ? S_OK : E_FAIL;
    }

    if (SUCCEEDED(hr))
    {
        // Calculate the size.
        imageFileSize = SizeofResource(HINST_THISCOMPONENT, imageResHandle);

        hr = imageFileSize ? S_OK : E_FAIL;
    }

    if (SUCCEEDED(hr))
    {
        // Create a WIC stream to map onto the memory.
        hr = pIWICFactory->CreateStream(&pStream);
    }

    if (SUCCEEDED(hr))
    {
        // Initialize the stream with the memory pointer and size.
        hr = pStream->InitializeFromMemory(
            reinterpret_cast<BYTE*>(pImageFile),
            imageFileSize
            );
    }

    if (SUCCEEDED(hr))
    {
        // Create a decoder for the stream.
        hr = pIWICFactory->CreateDecoderFromStream(
            pStream,
            NULL,
            WICDecodeMetadataCacheOnLoad,
            &pDecoder
            );
    }

    if (SUCCEEDED(hr))
    {
        // Create the initial frame.
        hr = pDecoder->GetFrame(0, &pSource);
    }

    if (SUCCEEDED(hr))
    {
        // Convert the image format to 32bppPBGRA
        // (DXGI_FORMAT_B8G8R8A8_UNORM + D2D1_ALPHA_MODE_PREMULTIPLIED).
        hr = pIWICFactory->CreateFormatConverter(&pConverter);
    }

    if (SUCCEEDED(hr))
    {
        hr = pConverter->Initialize(
            pSource,
            GUID_WICPixelFormat32bppPBGRA,
            WICBitmapDitherTypeNone,
            NULL,
            0.f,
            WICBitmapPaletteTypeMedianCut
            );
    }

    if (SUCCEEDED(hr))
    {
        // Create a Direct2D bitmap from the WIC bitmap.
        hr = pRenderTarget->CreateBitmapFromWicBitmap(
            pConverter,
            NULL,
            ppBitmap
            );
    }

    SafeRelease(&pDecoder);
    SafeRelease(&pSource);
    SafeRelease(&pStream);
    SafeRelease(&pConverter);

    return hr;
}

Animation

Bitmapobjekte

Beispiel für ein überschichtes untergeordnetes DirectComposition-Fenster