Board index » cppbuilder » Re: Class

2005-02-04 02:46:26 AM
cppbuilder87
"Arnaldo Giacomitti Junior" < XXXX@XXXXX.COM >wrote in message
the sub-component events.
Gambit
 

Hello all
I have a form
class TfrmMain : public TForm
{
__published: // IDE-managed Components
TPanel *picTickerPanel;
private: // User declarations
public: // User declarations
__fastcall TfrmMain(TComponent* Owner);
};
//-------------------------------------------------
extern PACKAGE TfrmMain *frmMain;
I created a class derived from TShockwaveFlash
//in the header
class TImageFLASH : public TShockwaveFlash
{
private:
String FlashCursor;
public:
__fastcall TImageFLASH(TComponent *Owner);
BEGIN_MESSAGE_MAP
VCL_MESSAGE_HANDLER(CM_MOUSEENTER, TMessage, CMMouseEnter)
VCL_MESSAGE_HANDLER(CM_MOUSELEAVE, TMessage, CMMouseLeave)
END_MESSAGE_MAP(TShockwaveFlash)
};
//in the Cpp file
void __fastcall TImageFLASH::CMMouseEnter(TMessage &Message)
{
TShockwaveFlash::Dispatch(&Message)
...........//some thing
}
At runtime i am creating a some flash controls in the "picTickerPanel" panel
of frmMain
for(int FLASHImageNumber=0; FLASHImageNumber<=3; FLASHImageNumber++)
{
TImageFLASH *ImageFLASH = new TImageFLASH(picTickerPanel);
ImageFLASH->Parent = picTickerPanel;
ImageFLASH->Tag = FLASHImageNumber;
}
and placing in the panel.
My Problems
----------
When the mouse is over the flash images i want to know the ImageFLASH Tag
number (Sender) of the event.
Thanks
SA
 

Hi SA,
I don't know what TShockwaveFlash descends from, but if your TImageFLASH
has a Tag property, you can access that property directly from within
the TImageFLASH::CMMouseEnter (or CMMouseLeave) method(s). When you
receive the CMMouseEnter/Leave messages, just make sure to check that
the Msg.LParam data member is NULL; if it's not, then the message was
intended for a child of the TImageFLASH (not an issue if TImageFLASH
can't contain other child controls).
I would suggest creating OnMouseEnter and OnMouseLeave events for your
TImageFLASH class; this is similar to what's available to TControl
descendants in newer versions of C++Builder; some similar to...
class TImageFLASH : public TShockwaveFlash
{
__published:
__property TNotifyEvent OnMouseEnter =
{read=OnMouseEnter_, write=OnMouseEnter_};
__property TNotifyEvent OnMouseLeave =
{read=OnMouseLeave_, write=OnMouseLeave_};
public:
__fastcall TImageFLASH(TComponent* AOwner) :
TShockwaveFlash(AOwner) {}
private:
void __fastcall CMMouseEnter(TMessage& Msg);
void __fastcall CMMouseLeave(TMessage& Msg);
private:
TNotifyEvent OnMouseEnter_;
TNotifyEvent OnMouseLeave_;
public:
BEGIN_MESSAGE_MAP
VCL_MESSAGE_HANDLER(CM_MOUSEENTER, TMessage, CMMouseEnter)
VCL_MESSAGE_HANDLER(CM_MOUSELEAVE, TMessage, CMMouseLeave)
END_MESSAGE_MAP(TCustomControl)
};
void __fastcall TMyControl::
CMMouseEnter(TMessage& Msg)
{
TCustomControl::Dispatch(&Msg);
if (Msg.LParam == NULL && OnMouseEnter_ != NULL)
{
OnMouseEnter_(this);
}
}
void __fastcall TMyControl::
CMMouseLeave(TMessage& Msg)
{
TCustomControl::Dispatch(&Msg);
if (Msg.LParam == NULL && OnMouseLeave_ != NULL)
{
OnMouseLeave_(this);
}
}
Cheers,
bar wrote:

{smallsort}

It has the tag property. In the TImageFLASH::CMMouseEnter, i can't able to
find from which flash image the event is occuring.
void __fastcall TImageFLASH::CMMouseEnter(TMessage &Message)
{
//some thing working fine.
.....
Now how to find the Sender of this event.
}
 

'this' is the sender. You should just be able to access 'Tag' directly.
void __fastcall TImageFLASH::CMMouseEnter(TMessage &Message)
{
TShockwaveFlash::Dispatch(&Message);
switch (Tag)
{ // blah
}
}
- Clayton
 

"bar" < XXXX@XXXXX.COM >wrote:
subclass the object and add a message handler and in that case
the implicit 'this' pointer would point to the current object.
and would only be valid if part of a subclassed TImage object
and even then it would most likely be at issue because ...
Prior to BDS (and possibly including BDS), CM_MOUSEENTER and
CM_MOUSELEAVE are unreliable. For more see here:
www.stevetrefethen.com/blog/IntroducingOnMouseEnterOnMouseLeaveEventsOnTControlInVCLForDelphi2006.aspx
You need to explain exactly what it is that you want to
accomplish and then explain exactly how the samples fit
into your design.
~ JD
 

Hi Clayton.Thanks
this is what i need
Cheers
SA
 

"bar" < XXXX@XXXXX.COM >wrote in message
pointing to, so just use the Tag property directly, ie:
void __fastcall TImageFLASH::CMMouseEnter(TMessage &Message)
{
TShockwaveFlash::Dispatch(&Message)
if( Tag == whatever )
// do something ...
}
Gambit