duilib 增加gif控件（基于gdi+，可控制播放暂停，自动设置大小）

转载请说明原出处，谢谢~~：/article/1371194.html

因为项目需要我需要给duilib增加一个gif控件，目前已经有了gif控件有很多版本，我去搜集了一些控件，但是都没有自己满意的。原uilib库中已经有GifAnim控件，但是这个控件给出的控制功能不足，不可以控制播放、暂停、停止。当控件隐藏时也不会停止播放动画，会影响效率。

于是在原GifAnim的基础上做了增强，增加了PlayGif、PauseGif、StopGif函数来控制播放、暂停、停止。增加autoplay属性控制控件初始时是否自动播放。

GifAnim的属性如下：

<GifAnim parent="Control" notifies="setfocus killfocus timer menu windowinit(root)">
<Attribute name="bkimage" default="" type="STRING" comment="Gif动画图片路径"/>
<Attribute name="autoplay" default="true" type="BOOL" comment="是否自动播放GIF动画"/>
<Attribute name="autosize" default="false" type="BOOL" comment="是否根据图片自动设置控件大小"/>
</GifAnim>

xml代码对应为：

<GifAnim name="gif" bkimage="0.gif" autoplay="true" autosize="true" width="100" height="100" />

gif控件用gdi+函数来解析图片，所以要初始化gdi+接口，为了避免多次重复初始化gdi+，所以把初始化函数写到了CPaintManager的构造函数里。

UIGifAnim.h源码如下：

#ifndef GifAnimUI_h__
#define GifAnimUI_h__

#pragma once

namespace DuiLib
{
class CControl;

#define EVENT_TIEM_ID	100

class UILIB_API CGifAnimUI : public CControlUI
{
public:
CGifAnimUI(void);
~CGifAnimUI(void);

LPCTSTR	GetClass() const;
LPVOID	GetInterface(LPCTSTR pstrName);
void	DoInit() override;
void	DoPaint(HDC hDC, const RECT& rcPaint) override;
void	DoEvent(TEventUI& event) override;
void	SetVisible(bool bVisible = true ) override;
void	SetAttribute(LPCTSTR pstrName, LPCTSTR pstrValue) override;
void	SetBkImage(LPCTSTR pStrImage);
LPCTSTR GetBkImage();

void	SetAutoPlay(bool bIsAuto = true );
bool	IsAutoPlay() const;
void	SetAutoSize(bool bIsAuto = true );
bool	IsAutoSize() const;
void	PlayGif();
void	PauseGif();
void	StopGif();

private:
void	InitGifImage();
void	DeleteGif();
void    OnTimer( UINT_PTR idEvent );
void	DrawFrame( HDC hDC );		// 绘制GIF每帧
Gdiplus::Image*	LoadGifFromFile(LPCTSTR pstrGifPath);
Gdiplus::Image* LoadGifFromMemory( LPVOID pBuf,size_t dwSize );
private:
Gdiplus::Image	*m_pGifImage;
UINT			m_nFrameCount;				// gif图片总帧数
UINT			m_nFramePosition;			// 当前放到第几帧
Gdiplus::PropertyItem*	m_pPropertyItem;	// 帧与帧之间间隔时间

CDuiString		m_sBkImage;
bool			m_bIsAutoPlay;				// 是否自动播放gif
bool			m_bIsAutoSize;				// 是否自动根据图片设置大小
bool			m_bIsPlaying;

};
}

#endif // GifAnimUI_h__

UIGifAnim.cpp源码如下：

#include "StdAfx.h"
#include "UIGifAnim.h"

///////////////////////////////////////////////////////////////////////////////////////
DECLARE_HANDLE(HZIP);	// An HZIP identifies a zip file that has been opened
typedef DWORD ZRESULT;
typedef struct
{
int index;                 // index of this file within the zip
char name[MAX_PATH];       // filename within the zip
DWORD attr;                // attributes, as in GetFileAttributes.
FILETIME atime,ctime,mtime;// access, create, modify filetimes
long comp_size;            // sizes of item, compressed and uncompressed. These
long unc_size;             // may be -1 if not yet known (e.g. being streamed in)
} ZIPENTRY;
typedef struct
{
int index;                 // index of this file within the zip
TCHAR name[MAX_PATH];      // filename within the zip
DWORD attr;                // attributes, as in GetFileAttributes.
FILETIME atime,ctime,mtime;// access, create, modify filetimes
long comp_size;            // sizes of item, compressed and uncompressed. These
long unc_size;             // may be -1 if not yet known (e.g. being streamed in)
} ZIPENTRYW;
#define OpenZip OpenZipU
#define CloseZip(hz) CloseZipU(hz)
extern HZIP OpenZipU(void *z,unsigned int len,DWORD flags);
extern ZRESULT CloseZipU(HZIP hz);
#ifdef _UNICODE
#define ZIPENTRY ZIPENTRYW
#define GetZipItem GetZipItemW
#define FindZipItem FindZipItemW
#else
#define GetZipItem GetZipItemA
#define FindZipItem FindZipItemA
#endif
extern ZRESULT GetZipItemA(HZIP hz, int index, ZIPENTRY *ze);
extern ZRESULT GetZipItemW(HZIP hz, int index, ZIPENTRYW *ze);
extern ZRESULT FindZipItemA(HZIP hz, const TCHAR *name, bool ic, int *index, ZIPENTRY *ze);
extern ZRESULT FindZipItemW(HZIP hz, const TCHAR *name, bool ic, int *index, ZIPENTRYW *ze);
extern ZRESULT UnzipItem(HZIP hz, int index, void *dst, unsigned int len, DWORD flags);
///////////////////////////////////////////////////////////////////////////////////////

namespace DuiLib
{

CGifAnimUI::CGifAnimUI(void)
{
m_pGifImage			=	NULL;
m_pPropertyItem		=	NULL;
m_nFrameCount		=	0;
m_nFramePosition	=	0;
m_bIsAutoPlay		=	true;
m_bIsAutoSize		=	false;
m_bIsPlaying		=	false;

}

CGifAnimUI::~CGifAnimUI(void)
{
DeleteGif();
m_pManager->KillTimer( this, EVENT_TIEM_ID );

}

LPCTSTR CGifAnimUI::GetClass() const
{
return _T("GifAnimUI");
}

LPVOID CGifAnimUI::GetInterface( LPCTSTR pstrName )
{
if( _tcscmp(pstrName, DUI_CTR_GIFANIM) == 0 ) return static_cast<CGifAnimUI*>(this);
return CControlUI::GetInterface(pstrName);
}

void CGifAnimUI::DoInit()
{
InitGifImage();
}

void CGifAnimUI::DoPaint( HDC hDC, const RECT& rcPaint )
{
if( !::IntersectRect( &m_rcPaint, &rcPaint, &m_rcItem ) ) return;
if ( NULL == m_pGifImage )
{
InitGifImage();
}
DrawFrame( hDC );
}

void CGifAnimUI::DoEvent( TEventUI& event )
{
if( event.Type == UIEVENT_TIMER )
OnTimer( (UINT_PTR)event.wParam );
}

void CGifAnimUI::SetVisible(bool bVisible /* = true */)
{
CControlUI::SetVisible(bVisible);
if (bVisible)
PlayGif();
else
StopGif();
}

void CGifAnimUI::SetAttribute(LPCTSTR pstrName, LPCTSTR pstrValue)
{
if( _tcscmp(pstrName, _T("bkimage")) == 0 ) SetBkImage(pstrValue);
else if( _tcscmp(pstrName, _T("autoplay")) == 0 ) {
SetAutoPlay(_tcscmp(pstrValue, _T("true")) == 0);
}
else if( _tcscmp(pstrName, _T("autosize")) == 0 ) {
SetAutoSize(_tcscmp(pstrValue, _T("true")) == 0);
}
else
CControlUI::SetAttribute(pstrName, pstrValue);
}

void CGifAnimUI::SetBkImage(LPCTSTR pStrImage)
{
if( m_sBkImage == pStrImage || NULL == pStrImage) return;

m_sBkImage = pStrImage;

StopGif();
DeleteGif();

Invalidate();

}

LPCTSTR CGifAnimUI::GetBkImage()
{
return m_sBkImage.GetData();
}

void CGifAnimUI::SetAutoPlay(bool bIsAuto)
{
m_bIsAutoPlay = bIsAuto;
}

bool CGifAnimUI::IsAutoPlay() const
{
return m_bIsAutoPlay;
}

void CGifAnimUI::SetAutoSize(bool bIsAuto)
{
m_bIsAutoSize = bIsAuto;
}

bool CGifAnimUI::IsAutoSize() const
{
return m_bIsAutoSize;
}

void CGifAnimUI::PlayGif()
{
if (m_bIsPlaying || m_pGifImage == NULL)
{
return;
}

long lPause = ((long*) m_pPropertyItem->value)[m_nFramePosition] * 10;
if ( lPause == 0 ) lPause = 100;
m_pManager->SetTimer( this, EVENT_TIEM_ID, lPause );

m_bIsPlaying = true;
}

void CGifAnimUI::PauseGif()
{
if (!m_bIsPlaying || m_pGifImage == NULL)
{
return;
}

m_pManager->KillTimer(this, EVENT_TIEM_ID);
this->Invalidate();
m_bIsPlaying = false;
}

void CGifAnimUI::StopGif()
{
if (!m_bIsPlaying)
{
return;
}

m_pManager->KillTimer(this, EVENT_TIEM_ID);
m_nFramePosition = 0;
this->Invalidate();
m_bIsPlaying = false;
}

void CGifAnimUI::InitGifImage()
{
m_pGifImage = LoadGifFromFile(GetBkImage());
if ( NULL == m_pGifImage ) return;
UINT nCount	= 0;
nCount	=	m_pGifImage->GetFrameDimensionsCount();
GUID* pDimensionIDs	=	new GUID[ nCount ];
m_pGifImage->GetFrameDimensionsList( pDimensionIDs, nCount );
m_nFrameCount	=	m_pGifImage->GetFrameCount( &pDimensionIDs[0] );
int nSize		=	m_pGifImage->GetPropertyItemSize( PropertyTagFrameDelay );
m_pPropertyItem	=	(Gdiplus::PropertyItem*) malloc( nSize );
m_pGifImage->GetPropertyItem( PropertyTagFrameDelay, nSize, m_pPropertyItem );
delete  pDimensionIDs;
pDimensionIDs = NULL;

if (m_bIsAutoSize)
{
SetFixedWidth(m_pGifImage->GetWidth());
SetFixedHeight(m_pGifImage->GetHeight());
}
if (m_bIsAutoPlay)
{
PlayGif();
}
}

void CGifAnimUI::DeleteGif()
{
if ( m_pGifImage != NULL )
{
delete m_pGifImage;
m_pGifImage = NULL;
}

if ( m_pPropertyItem != NULL )
{
free( m_pPropertyItem );
m_pPropertyItem = NULL;
}
m_nFrameCount		=	0;
m_nFramePosition	=	0;
}

void CGifAnimUI::OnTimer( UINT_PTR idEvent )
{
if ( idEvent != EVENT_TIEM_ID )
return;
m_pManager->KillTimer( this, EVENT_TIEM_ID );
this->Invalidate();

m_nFramePosition = (++m_nFramePosition) % m_nFrameCount;

long lPause = ((long*) m_pPropertyItem->value)[m_nFramePosition] * 10;
if ( lPause == 0 ) lPause = 100;
m_pManager->SetTimer( this, EVENT_TIEM_ID, lPause );
}

void CGifAnimUI::DrawFrame( HDC hDC )
{
if ( NULL == hDC || NULL == m_pGifImage ) return;
GUID pageGuid = Gdiplus::FrameDimensionTime;
Gdiplus::Graphics graphics( hDC );
graphics.DrawImage( m_pGifImage, m_rcItem.left, m_rcItem.top, m_rcItem.right-m_rcItem.left, m_rcItem.bottom-m_rcItem.top );
m_pGifImage->SelectActiveFrame( &pageGuid, m_nFramePosition );
}

Gdiplus::Image* CGifAnimUI::LoadGifFromFile(LPCTSTR pstrGifPath)
{
LPBYTE pData = NULL;
DWORD dwSize = 0;

do
{
CDuiString sFile = CPaintManagerUI::GetResourcePath();
if( CPaintManagerUI::GetResourceZip().IsEmpty() ) {
sFile += pstrGifPath;
HANDLE hFile = ::CreateFile(sFile.GetData(), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, \
FILE_ATTRIBUTE_NORMAL, NULL);
if( hFile == INVALID_HANDLE_VALUE ) break;
dwSize = ::GetFileSize(hFile, NULL);
if( dwSize == 0 ) break;

DWORD dwRead = 0;
pData = new BYTE[ dwSize ];
::ReadFile( hFile, pData, dwSize, &dwRead, NULL );
::CloseHandle( hFile );

if( dwRead != dwSize ) {
delete[] pData;
pData = NULL;
break;
}
}
else {
sFile += CPaintManagerUI::GetResourceZip();
HZIP hz = NULL;
if( CPaintManagerUI::IsCachedResourceZip() ) hz = (HZIP)CPaintManagerUI::GetResourceZipHandle();
else hz = OpenZip((void*)sFile.GetData(), 0, 2);
if( hz == NULL ) break;
ZIPENTRY ze;
int i;
if( FindZipItem(hz, pstrGifPath, true, &i, &ze) != 0 ) break;
dwSize = ze.unc_size;
if( dwSize == 0 ) break;
pData = new BYTE[ dwSize ];
int res = UnzipItem(hz, i, pData, dwSize, 3);
if( res != 0x00000000 && res != 0x00000600) {
delete[] pData;
pData = NULL;
if( !CPaintManagerUI::IsCachedResourceZip() ) CloseZip(hz);
break;
}
if( !CPaintManagerUI::IsCachedResourceZip() ) CloseZip(hz);
}

} while (0);

while (!pData)
{
//读不到图片, 则直接去读取bitmap.m_lpstr指向的路径
HANDLE hFile = ::CreateFile(pstrGifPath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, \
FILE_ATTRIBUTE_NORMAL, NULL);
if( hFile == INVALID_HANDLE_VALUE ) break;
dwSize = ::GetFileSize(hFile, NULL);
if( dwSize == 0 ) break;

DWORD dwRead = 0;
pData = new BYTE[ dwSize ];
::ReadFile( hFile, pData, dwSize, &dwRead, NULL );
::CloseHandle( hFile );

if( dwRead != dwSize ) {
delete[] pData;
pData = NULL;
}
break;
}
if (!pData)
{
return NULL;
}

return LoadGifFromMemory(pData, dwSize);
}

Gdiplus::Image* CGifAnimUI::LoadGifFromMemory( LPVOID pBuf,size_t dwSize )
{
HGLOBAL hMem = ::GlobalAlloc(GMEM_FIXED, dwSize);
BYTE* pMem = (BYTE*)::GlobalLock(hMem);

memcpy(pMem, pBuf, dwSize);

IStream* pStm = NULL;
::CreateStreamOnHGlobal(hMem, TRUE, &pStm);
Gdiplus::Image *pImg = Gdiplus::Image::FromStream(pStm);
if(!pImg || pImg->GetLastStatus() != Gdiplus::Ok)
{
pStm->Release();
::GlobalUnlock(hMem);
return 0;
}
return pImg;
}

}

总结：

Gif控件已经同步更新到我的duilib库里：点击打开链接

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