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[CILVideo : (Netscape,Explorer) video window ] | ||
Environment: Win 95/98 VC6 SP4
CILVideo is a very simple class .
This is a CWnd derived class which contains a bitmap. This bitmap represents several images : the same as an image-list.
(Image lists are bitmaps , sometimes 2 bitmaps : 1 for mask)
You create a window by calling 2 optional functions :
the second function is useful on dialog windows , and it just determines the size
of the wanted window and calls Create(...)
BOOL Create(UINT nID,CWnd *pParent,RECT &rc); BOOL CreateFromStatic(UINT nID,CWnd *pParent);Several functions are concerned with setting link to that image: when you set a hand cursor (by using SetHandCursor(TRUE) - You may also unset hand cursor- and sets valid links to the image : you provide means of navigation. The default of class sdemands a hand cursor when you want to navigate . (In order to make it appear like a browser)
void SetLink(LPCTSTR lpszLink=NULL) {
if (lpszLink) strLink=lpszLink;
}
Navigation is activated when you double-click : then theres a check for valid hand cursor
and non NULL link and , a call to ShellExecute. Invalidate is called in order to repaint the window.
(Processing of ShellExecute is long and the window might not get WM_PAINT on time , if hidden ...)
void CILVideo::OnLButtonUp(UINT nFlags, CPoint point)
{
CWnd::OnLButtonUp(nFlags, point);
if (hCursorHand && strLink.GetLength())
{
::ShellExecute(m_hWnd,_T("open"),strLink,NULL,NULL,SW_SHOWDEFAULT);
Invalidate();
UpdateWindow();
}
}
Several functions manage playing images , stopping them and so on.
When playing : a default timer is set and each time its function handler is called , a counter of the current step
is incremented and the next step is done . Whenever I speak about steps ,
I mean the next episode (Image in series of images in image list)
You may also want to reset the frequency (hou quick images are changed) : although the default is suitable for most
scenarios, on doing that the Window stops immediately the timer (if its playing) and
sets a new timer and replays animation.
void SetPlayMode(BOOL bDoByOrder) { m_bDoByOrder=bDoByOrder; }
BOOL GetPlayMode() { return m_bDoByOrder; }
Another feature that is added here is the ability to stretch each image to the
size of the window , or to reset window size to the size of the image.
You do it when you load that bitmap. The last parameter of LoadBitmap is a boolean:
when bAdjust=TRUE you resize client rect to the size of each image (every images has the same size)
On FALSE the image will be stretched to fit the size of the window.
(This is useful when window is placed within rebar-ctrl , and moves between bands : which have different height ,
you may resize the window and images will automaticly be stretched . Internet Explorer loads several images into its
video on top. (This is another approach).
BOOL LoadBitmap(LPCTSTR lpszResourceName,int cx,int cy,BOOL bAdjust=TRUE);
BOOL LoadBitmap(UINT nID,int cx,int cy,BOOL bAdjust=TRUE) {
return LoadBitmap(MAKEINTRESOURCE(nID),cx,cy,bAdjust);
}
Stretching is done on 2 ways the first is done by cally StretchBlt
, the secont is BitBlt on a different mapping mode.
I left 2 OnPaint() functions to demonstrate both ways . Which one is better ?
(My eye doesnt notice any difference in speed nor clarity)
void CILVideo::OnPaint()
{
// ...
if (!bAdjustWindow2IconSize) { // do stretch
nPrevMM = dc.SetMapMode(MM_ANISOTROPIC);
szPrevWinExt = dc.SetWindowExt(m_ImageSize);
szPrevVPExt = dc.SetViewportExt(rc.Width(),rc.Height());
}
// for all (BitBlt that does StretchBlt)
::BitBlt(dc.GetSafeHdc(),0,0,m_ImageSize.cx,m_ImageSize.cy,
memDC.GetSafeHdc(),m_StartPoint.cx,m_StartPoint.cy,SRCCOPY);
if (!bAdjustWindow2IconSize) { // do stretch
dc.SetViewportExt(szPrevVPExt);
dc.SetWindowExt(szPrevWinExt);
dc.SetMapMode(nPrevMM);
// ...
}
All images that you see are taken from Internet Explorer 4+5 Dlls
: (property of Microsoft) : They really make a huge mess with their Dlls and resources
, each version I need to relook for them again. Why messing them around?
The application uses some resources I exported from (Internet Explorer 4) "msoleres.dll"
this dll resides under \Program Files\Outlook Express\
you will find inside many of resources being used by microsoft applications .
(the VB env. also contains a sample that uses a bitmap
to do animation instead of an animation file.
(Internet Explorer version 5+ {system directory}\\browseui.dll
This version doesnt use some additional features (remove to make everything lighter)
such as loading Imagelist (variable : HIMAGELIST hImage; and rotation)
I also provided a demo project to show everything.
Move to downloads downloads
