Cstatic control background transparent instance code

Blog transfer: http://vivianke.blog.163.com/blog/static/29715271200781121358317/

 

Note:
1. the background of the cstatic control is transparent. You must first derive a class from cstatic. In this class, afx_msg hbrush ctlcolor (CDC * PDC, uint nctlcolor) is a reflection function that processes messages of = wm_ctlolor, message ing macro: on_wm_ctlcolor_reflect (),
2. afx_msg hbrush onctlcolor (CDC * PDC, cwnd * pwnd, uint nctlcolor); processes wm_ctlcolor messages, used to change the control color, which is a message processing function.
3. afx_msg bool onerasebkgnd (CDC * PDC); process the wm_erasebkgnd message to display the background image. the background must be set to transparent, that is, the afx_msg hbrush ctlcolor (CDC * PDC, uint nctlcolor) reflection function must be called.
// Ctransparentstatic class

# If _ msc_ver> 1000
# Pragma once
# Endif // _ msc_ver> 1000
// Transparentstatic. h: header file
//

//////////////////////////////////////// /////////////////////////////////////
// Ctransparentstatic window

Class ctransparentstatic: Public cstatic
{
// Construction
Public:
Ctransparentstatic ();

// Attributes
Public:

// Operations
Public:

// Overrides
// Classwizard generated virtual function overrides
// {Afx_virtual (ctransparentstatic)
//} Afx_virtual

// Implementation
Public:
Virtual ~ Ctransparentstatic ();

// Generated message map Functions
Protected:
// {Afx_msg (ctransparentstatic)
Afx_msg hbrush onctlcolor (CDC * PDC, cwnd * pwnd, uint nctlcolor); // control color processing function
Afx_msg hbrush ctlcolor (CDC * PDC, uint nctlcolor); // reflection function, processing control color, you can set the background Mode
Afx_msg bool onerasebkgnd (CDC * PDC); // remove the background to display the background.
//} Afx_msg

Declare_message_map ()
PRIVATE:
Cbitmap m_bmp;
};

//////////////////////////////////////// /////////////////////////////////////

// {Afx_insert_location }}
// Microsoft Visual C ++ will insert additional declarations immediately before the previous line.

# Endif //! Defined (afx_transparentstatic_h1_8b6d6931_a3de_400f_ba33_f4097632d8eb1_included _)

// Transparentstatic. cpp: implementation file
//

# Include "stdafx. H"
# Include "material_mis.h"
# Include "transparentstatic. H"

# Ifdef _ debug
# Define new debug_new
# UNDEF this_file
Static char this_file [] = _ file __;
# Endif

//////////////////////////////////////// /////////////////////////////////////
// Ctransparentstatic

Ctransparentstatic: ctransparentstatic ()
{
}

Ctransparentstatic ::~ Ctransparentstatic ()
{
}

Begin_message_map (ctransparentstatic, cstatic)
// {Afx_msg_map (ctransparentstatic)
On_wm_ctlcolor ()
On_wm_ctlcolor_reflect ()
On_wm_erasebkgnd ()
//} Afx_msg_map
End_message_map ()

//////////////////////////////////////// /////////////////////////////////////
// Ctransparentstatic message handlers

Hbrush ctransparentstatic: onctlcolor (CDC * PDC, cwnd * pwnd, uint nctlcolor)
{
Hbrush HBr = cstatic: onctlcolor (PDC, pwnd, nctlcolor );

If (pwnd-> getdlgctrlid () = idc_static_text)
PDC-> settextcolor (RGB (255,255,255); // you can specify the text color displayed in the control.

Return HBr;
}

Hbrush ctransparentstatic: ctlcolor (CDC * PDC, uint nctlcolor)
{
PDC-> setbkmode (transparent); // The transparent mode of the device background.
Return (hbrush) getstockobject (null_brush );
}

Bool ctransparentstatic: onerasebkgnd (CDC * PDC)
{
If (m_bmp .getsafehandle () = NULL ){
Crect rect;
Getwindowrect (& rect );
Cwnd * pparent = getparent ();
Assert (pparent );
Pparent-> screentoclient (& rect); // convert our your diates to our parents
// Copy what's on the parents at this point
CDC * PDC = pparent-> getdc ();
CDC memdc;
Memdc. createcompatibledc (PDC );
M_bmp .createcompatiblebitmap (PDC, rect. Width (), rect. Height ());
Cbitmap * poldbmp = memdc. SelectObject (& m_bmp );
Memdc. bitblt (0, 0, rect. Width (), rect. Height (), PDC, rect. Left, rect. Top, srccopy );
Memdc. SelectObject (poldbmp );
Pparent-> releasedc (PDC );
}
Else // copy what we copied off the parent the first time back onto the parent
{
Crect rect;
Getclientrect (rect );
CDC memdc;
Memdc. createcompatibledc (PDC );
Cbitmap * poldbmp = memdc. SelectObject (& m_bmp );
PDC-> bitblt (0, 0, rect. Width (), rect. Height (), & memdc, 0, 0, srccopy );
Memdc. SelectObject (poldbmp );
}

Return true;
}

// View class
Ctransparentstatic m_static;

Void cmaterial_misview: createstaticctrl ()
{
Crect rect;
Getclientrect (& rect );
// Set the size of the static text box
Rect. Top = 5;
Rect. Left = rect. Right/2-180/2;
Rect. Bottom = 30;
Rect. Right = rect. Left + 180;
// Create a static text box
M_static.create (m_strcurlist, ws_visible | ss_center, rect, this, idc_static_text );
// Set the font of the Static Control
M_static.setfont (& m_font );
}