Cara menganimasikan bitmap jendela anak berlapis
Catatan
Untuk aplikasi di Windows 10, sebaiknya gunakan WINDOWS.UI.Composition API alih-alih DirectComposition. Untuk informasi selengkapnya, lihat Memodernisasi aplikasi desktop Anda menggunakan lapisan Visual.
Topik ini menjelaskan cara membuat dan menganimasikan visual yang menggunakan bitmap jendela anak berlapis sebagai konten visual. Contoh yang dijelaskan dalam topik ini menggunakan transformasi skala animasi untuk "menumbuhkan" bitmap jendela anak dari ukuran jempol ke ukuran penuh. Untuk informasi selengkapnya tentang jendela berlapis, lihat Bitmap Jendela.
Apa yang perlu Anda ketahui
Teknologi
Prasyarat
- C/C++
- Microsoft Win32
- Model Objek Komponen (COM)
Petunjuk
Langkah 1: Membuat jendela anak berlapis
Gunakan langkah-langkah berikut untuk membuat jendela anak berlapis.
- Daftarkan kelas jendela anak dan buat jendela anak yang memiliki gaya WS_EX_LAYERED . Dalam contoh berikut,
m_dpiXdanm_dpiYtentukan resolusi layar dalam piksel per inci logis, danm_hwndMainmerupakan handel dari jendela aplikasi utama.
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);
- Panggil fungsi SetLayeredWindowAttributes untuk mengatur kunci warna transparansi dan tingkat keburaman jendela anak berlapis. Kode berikut mengatur kunci warna transparansi ke nol dan tingkat keburaman menjadi 255 (buram).
if (!SetLayeredWindowAttributes(m_hwndLayeredChild, 0, 255, LWA_ALPHA))
{
hr = HRESULT_FROM_WIN32(GetLastError());
}
- Render beberapa konten ke jendela anak.
Langkah 2: Menginisialisasi objek DirectComposition
Buat objek perangkat dan objek target komposisi. Untuk informasi selengkapnya, lihat Cara menginisialisasi DirectComposition.
Langkah 3: Buat objek visual dan atur bitmap jendela anak berlapis sebagai properti konten
Gunakan langkah-langkah berikut untuk membuat visual, mengatur properti kontennya untuk menggunakan bitmap jendela anak berlapis, lalu tambahkan visual ke pohon visual.
- Panggil IDCompositionDevice::CreateVisual untuk membuat objek visual.
- Buat permukaan Microsoft DirectComposition untuk jendela anak berlapis dengan meneruskan handel jendela anak ke fungsi CreateSurfaceFromHwnd .
- Panggil metode IDCompositionVisual::SetContent objek visual untuk mengatur permukaan baru sebagai konten visual jendela anak berlapis.
- Tambahkan objek visual ke pohon visual. Untuk menambahkan visual ke akar pohon, panggil metode IDCompositionTarget::SetRoot . Untuk menambahkan visual sebagai anak dari visual lain, gunakan metode IDCompositionVisual::AddVisual dari visual induk.
Contoh berikut membuat objek visual, mengatur properti Kontennya untuk menggunakan bitmap jendela anak berlapis, dan menambahkan visual ke akar pohon visual.
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);
}
Langkah 4: Membuat objek animasi dan objek transformasi skala
Gunakan metode IDCompositionDevice::CreateAnimation untuk membuat objek animasi, dan metode IDCompositionDevice::CreateScaleTransform untuk membuat objek transformasi skala.
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);
}
Langkah 5: Membangun fungsi animasi
Gunakan metode antarmuka IDCompositionAnimation objek animasi untuk membangun fungsi animasi.
Contoh berikut membangun fungsi animasi sederhana yang terdiri dari satu segmen polinomial kubik dan satu segmen ujung.
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);
Langkah 6: Terapkan objek animasi ke properti objek transformasi skala
Gunakan metode IDCompositionScale::SetScaleX dan SetScaleY untuk menerapkan objek animasi ke properti ScaleX dan ScaleY dari objek transformasi skala.
// 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);
Langkah 7: Terapkan objek transformasi skala ke properti transformasi visual
Gunakan metode IDCompositionVisual::SetTransform untuk menerapkan objek transformasi skala ke properti Transformasi visual.
hr = pVisual->SetTransform(pScale);
Langkah 8: Kloning jendela anak berlapis
Sebelum menerapkan animasi, gunakan fungsi DwmSetWindowAttribute dengan bendera DWMWA_CLOAK untuk "menyelubungi" jendela anak berlapis. Kloning menghapus jendela anak berlapis dari tampilan saat versi animasi tampilan bitmap jendela sedang dirender ke layar.
BOOL fCloak = TRUE;
DwmSetWindowAttribute(pDemoApp->m_hwndLayeredChild,
DWMWA_CLOAK,
&fCloak,
sizeof(fCloak));
Langkah 9: Terapkan komposisi
Gunakan metode IDCompositionDevice::Commit untuk menerapkan batch perintah ke Microsoft DirectComposition untuk diproses. Animasi akan muncul di jendela target.
Langkah 10: Batalkan penyebaran jendela anak berlapis
Setelah animasi selesai, gunakan fungsi DwmSetWindowAttribute dengan bendera DWMWA_CLOAK untuk membuka jendela anak berlapis.
Langkah 11: Rilis objek DirectComposition
Pastikan untuk merilis semua objek DirectComposition saat Anda tidak lagi membutuhkannya. Contoh berikut memanggil makro SafeRelease yang ditentukan aplikasi untuk membebaskan objek DirectComposition.
SafeRelease(&pVisual);
SafeRelease(&pAnimateScale);
SafeRelease(&pScale);
SafeRelease(&m_pDevice);
SafeRelease(&m_pCompTarget);
Contoh lengkap
//
// 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's message loop. *
* *
******************************************************************/
void DemoApp::RunMessageLoop()
{
MSG msg;
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
/******************************************************************
* *
* The main window'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'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'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'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'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'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'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;
}
Topik terkait
Saran dan Komentar
Segera hadir: Sepanjang tahun 2024 kami akan menghentikan penggunaan GitHub Issues sebagai mekanisme umpan balik untuk konten dan menggantinya dengan sistem umpan balik baru. Untuk mengetahui informasi selengkapnya, lihat: https://aka.ms/ContentUserFeedback.
Kirim dan lihat umpan balik untuk