MFC button control self-painting

Article Reference address: http://blog.csdn.net/yue7603835/article/details/6649458

VC interface is really ugly sometimes we have to do our own control of the drawing has not been understood recently once again to learn again finally understand a little
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For example

We're going to change the background of an edit box. We respond to the WM_CTLCOLOR function for OnCtlColor modification but not to the button control.
At this time we are going to do self-drawing related functions virtual void DrawItem (lpDrawItemStruct lpdrawitemstruct);

To overwrite this virtual function and type to be set to Bs_ownerdraw when the application initializes the interface, it enters our

The DrawItem function makes the control draw so that self-drawing is 2 steps

• 1. Type to be set to Bs_ownerdraw
• 2. Rewrite virtual void DrawItem (lpdrawitemstruct lpdrawitemstruct); Function code we designed it ourselves.

Redraw required functions Note all functions in the SDK

BOOL Drawframecontrol (//This function draws a frame of a specified type of controlHDC HDC,//handle to device context DCLPRECT LPRC,//bounding rectangle holding areaUINT Utype,//Frame-control TypeUINT ustate//Frame-control State Status specifically see MSDN    );intDrawText (//outputs text in the specified rectangular areaHDC HDC,//Handle to DCLPCTSTR lpstring,//text to draw    intNcount,//Text LengthLPRECT LPRECT,//Formatting DimensionsUINT Uformat//text-drawing Options    ); COLORREF SetTextColor (//sets the text color of the specified DCHDC HDC,//Handle to DCCOLORREF Crcolor//text color    );intFillRect (//fills a rectangular area with a given paint brushHDC HDC,//Handle to DCCONST RECT *LPRC,//RectangleHbrush HBR//Handle to Brush    );intSetBkMode (//set Background mode transparent transparentHDC HDC,//Handle to DC    intIbkmode//Background Mode); typedefstructtagdrawitemstruct {//specifically see MSDNUINT Ctltype;//control typeUINT Ctlid;//IDUINT ItemID;//Item IDUINT itemaction;  Behavior UINT itemState; //StatusHWND Hwnditem;//Control HandleHDC hdc;//DC handleRECT RcItem;//Hold Areaulong_ptr ItemData; } drawitemstruct;D Raw3drect (lpcrect lpRect, Colorref clrtopleft, Colorref clrbottomright); //This function is used to implement the position size of the 3D rectangle, where lprect is filled with the position size of the entire 3D rectangle,//Clrtopleft and Clrbottomright are the RGB values in the upper left and bottom right of the 3D effect, respectively. BOOL DrawFocusRect (draw a dashed rectangular hdc hdc,//handle to device contextCONST rect* LPRC//logical Coordinates    ); //function function: Draw a focus rectangle.    This rectangle is done by an XOR operation in the style of the flag focus (the focus is usually represented by a dot line). //If the function is called again with the same parameters, it means that the focus rectangle is removed

Here is the program code:

voidCbtnxiaowei::D rawitem (lpdrawitemstruct lpdrawitemstruct) {CString btncaption; //Save Button TitleGetWindowText (btncaption);//Get button titleCRect DrawRect;//Defining CRect ObjectsHDC dc= lpdrawitemstruct->hdc;//Control DCCdc*pdc=cdc::fromhandle (DC);//get CDC pointer through HDCUINT nstyle=lpdrawitemstruct->Ctltype; Drawrect.copyrect (& (Lpdrawitemstruct->rcitem));//Copy Control rectangle area to our CRect objectDrawframecontrol (Dc,&drawrect,dfc_menu,nstyle);//drawing the control frameCBrush Pbrush;//Create a paint brush    Static intn=0; Pbrush.createsolidbrush (RGB ( -+n, the, n));//CreatePdc->fillrect (Drawrect,&pbrush);//Draw a rectanglePdc->settextcolor (M_clo);//Set Text colorCRect Textrect;//defines a crect for drawing textTextrect.copyrect (&drawrect);//Copy Rectangular AreaCSize sz=pdc->gettextextent (btncaption);//Get string Sizetextrect.top+= (Textrect.height ()-sz.cy)/2;//Adjust Text Position CenterPdc->setbkmode (TRANSPARENT);//set text background transparencyPdc->drawtext (btncaption,&textrect,dt_right| dt_center| Dt_bottom);//Draw Textn+=Ten; }voidCbtnxiaowei::settextcoler (colorref clo) {M_clo=CLO; Invalidate (); //is partially invalid causing redraw}

MFC button control self-painting