Colored Buttons

Environment: VC6

This is a class based on Bob Ryan’s CColorButton code of 1998/08/06.

The main modifications were to make the default view of a button to be exactly the same as a normal non-owner drawn button. To this end, the default colors are set in the constructor by interrogating the current Windows settings through the GetSysColor function. The colors may be set at any time by calling SetColour or SetColor (whatever your preference) with two or three parameters. The first is the text color. The second is the background color. The optional third is the color that will be used as the background for a disabled button. The button may be set to the Windows default by calling ResetColour() or ResetColor(). The small demo app. shows all of the permutations.

class CClrButton : public CButton
{
// Construction
public:
CClrButton();

// Attributes
public:

// Operations
public:
// UK version
void SetColour( COLORREF text_colour,
COLORREF background_colour);

// US version
void SetColor( COLORREF text_colour,
COLORREF background_colour)
{
SetColour( text_colour,
background_colour);
};

// UK version
void SetColour(COLORREF text_colour,
COLORREF background_colour,
COLORREF disabled_background_colour);

// US version
void SetColor(COLORREF text_colour,
COLORREF background_colour,
COLORREF disabled_background_colour)
{
SetColour( text_colour,
background_colour,
disabled_background_colour);
};

// UK version
void ResetColour();

// US version
void ResetColor()
{
ResetColour();
}

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CClrButton)

public:
virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
//}}AFX_VIRTUAL

// Implementation
public:
virtual ~CClrButton();

private:
COLORREF text_colour, background_colour, disabled_background_colour;
COLORREF light, highlight, shadow, dark_shadow;

// Generated message map functions
protected:
//{{AFX_MSG(CClrButton)
// NOTE – the ClassWizard will add and remove member functions here.
//}}AFX_MSG

void DrawFrame(CDC *dc, CRect r, int state);
void DrawFilledRect(CDC *dc, CRect r, COLORREF colour);
void DrawLine(CDC *dc, long sx, long sy,
long ex, long ey, COLORREF colour);
void DrawButtonText(CDC *dc, CRect r,
const char *buf, COLORREF text_colour);

DECLARE_MESSAGE_MAP()
};

const COLORREF CLR_BTN_WHITE = RGB(255, 255, 255);
const COLORREF CLR_BTN_BLACK = RGB(0, 0, 0);
const COLORREF CLR_BTN_DGREY = RGB(128, 128, 128);
const COLORREF CLR_BTN_GREY = RGB(192, 192, 192);
const COLORREF CLR_BTN_LLGREY = RGB(223, 223, 223);

const int BUTTON_IN = 0x01;
const int BUTTON_OUT = 0x02;
const int BUTTON_BLACK_BORDER = 0x04;

//////////////////////////////////////////////////////////////////////
// CClrButton

CClrButton::CClrButton()
{
text_colour = GetSysColor(COLOR_BTNTEXT);
background_colour = GetSysColor(COLOR_BTNFACE);
disabled_background_colour = background_colour;
light = GetSysColor(COLOR_3DLIGHT);
highlight = GetSysColor(COLOR_BTNHIGHLIGHT);
shadow = GetSysColor(COLOR_BTNSHADOW);
dark_shadow = GetSysColor(COLOR_3DDKSHADOW);
}

CClrButton::~CClrButton()
{
}

void CClrButton::SetColour( COLORREF new_text_colour,
COLORREF new_background_colour)
{
text_colour = new_text_colour;
background_colour = new_background_colour;
disabled_background_colour = GetSysColor(COLOR_BTNFACE);

Invalidate(FALSE);
}

void CClrButton::SetColour(COLORREF new_text_colour,
COLORREF new_background_colour,
COLORREF new_disabled_background_colour)
{
text_colour = new_text_colour;
background_colour = new_background_colour;
disabled_background_colour = new_disabled_background_colour;

Invalidate(FALSE);
}

void CClrButton::ResetColour()
{
text_colour = GetSysColor(COLOR_BTNTEXT);
background_colour = GetSysColor(COLOR_BTNFACE);
disabled_background_colour = background_colour;
light = GetSysColor(COLOR_3DLIGHT);
highlight = GetSysColor(COLOR_BTNHIGHLIGHT);
shadow = GetSysColor(COLOR_BTNSHADOW);
dark_shadow = GetSysColor(COLOR_3DDKSHADOW);

Invalidate(FALSE);
}

BEGIN_MESSAGE_MAP(CClrButton, CButton)
//{{AFX_MSG_MAP(CClrButton)
// NOTE – the ClassWizard will add and remove mapping
// macros here.
//}}AFX_MSG_MAP

END_MESSAGE_MAP()

//////////////////////////////////////////////////////////////
// CClrButton message handlers

void CClrButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
CDC *dc;
CRect focus_rect, button_rect, offset_button_rect;
UINT state;

dc = CDC::FromHandle(lpDrawItemStruct->hDC);
state = lpDrawItemStruct->itemState;

focus_rect.CopyRect(&lpDrawItemStruct->rcItem);
button_rect.CopyRect(&lpDrawItemStruct->rcItem);

// Set the focus rectangle to just past the border decoration
focus_rect.left += 4;
focus_rect.right -= 4;
focus_rect.top += 4;
focus_rect.bottom -= 4;

// Retrieve the button’s caption
const int bufSize = 512;
TCHAR buffer[bufSize];
GetWindowText(buffer, bufSize);

if (state & ODS_DISABLED)
{
DrawFilledRect(dc, button_rect, disabled_background_colour);
}
else
{
DrawFilledRect(dc, button_rect, background_colour);
}

if (state & ODS_SELECTED)
{
DrawFrame(dc, button_rect, BUTTON_IN);
}
else
{
if ((state & ODS_DEFAULT) || (state & ODS_FOCUS))
{
DrawFrame(dc, button_rect, BUTTON_OUT | BUTTON_BLACK_BORDER);
}
else
{
DrawFrame(dc, button_rect, BUTTON_OUT);
}
}

if (state & ODS_DISABLED)
{
offset_button_rect = button_rect;
offset_button_rect.OffsetRect(1, 1);

DrawButtonText(dc, offset_button_rect, buffer, CLR_BTN_WHITE);
DrawButtonText(dc, button_rect, buffer, CLR_BTN_DGREY);
}
else
{
DrawButtonText(dc, button_rect, buffer, text_colour);
}

if (state & ODS_FOCUS)
{
DrawFocusRect(lpDrawItemStruct->hDC, (LPRECT)&focus_rect);
}
}

void CClrButton::DrawFrame(CDC *dc, CRect r, int state)
{
COLORREF colour;

if (state & BUTTON_BLACK_BORDER)
{
colour = CLR_BTN_BLACK;

DrawLine(dc, r.left, r.top,
r.right, r.top, colour); // Across top
DrawLine(dc, r.left, r.top,
r.left, r.bottom, colour); // Down left
DrawLine(dc, r.left, r.bottom – 1,
r.right, r.bottom – 1, colour); // Across bottom
DrawLine(dc, r.right – 1, r.top,
r.right – 1, r.bottom, colour); // Down right

r.InflateRect(-1, -1);
}

if (state & BUTTON_OUT)
{
colour = highlight;

DrawLine(dc, r.left, r.top,
r.right, r.top, colour); // Across top
DrawLine(dc, r.left, r.top,
r.left, r.bottom, colour); // Down left

colour = dark_shadow;

DrawLine(dc, r.left, r.bottom – 1,
r.right, r.bottom – 1, colour); // Across bottom
DrawLine(dc, r.right – 1, r.top,
r.right – 1, r.bottom, colour); // Down right

r.InflateRect(-1, -1);

colour = light;

DrawLine(dc, r.left, r.top,
r.right, r.top, colour); // Across top
DrawLine(dc, r.left, r.top,
r.left, r.bottom, colour); // Down left

colour = shadow;

DrawLine(dc, r.left, r.bottom – 1,
r.right, r.bottom – 1, colour); // Across bottom
DrawLine(dc, r.right – 1, r.top,
r.right – 1, r.bottom, colour); // Down right
}

if (state & BUTTON_IN)
{
colour = dark_shadow;

DrawLine(dc, r.left, r.top,
r.right, r.top, colour); // Across top
DrawLine(dc, r.left, r.top,
r.left, r.bottom, colour); // Down left
DrawLine(dc, r.left, r.bottom – 1,
r.right, r.bottom – 1, colour); // Across bottom
DrawLine(dc, r.right – 1, r.top,
r.right – 1, r.bottom, colour); // Down right

r.InflateRect(-1, -1);

colour = shadow;

DrawLine(dc, r.left, r.top,
r.right, r.top, colour); // Across top
DrawLine(dc, r.left, r.top,
r.left, r.bottom, colour); // Down left
DrawLine(dc, r.left, r.bottom – 1,
r.right, r.bottom – 1, colour); // Across bottom
DrawLine(dc, r.right – 1, r.top,
r.right – 1, r.bottom, colour); // Down right
}
}

void CClrButton::DrawFilledRect(CDC *dc, CRect r, COLORREF colour)
{
CBrush B;

B.CreateSolidBrush(colour);
dc->FillRect(r, &B);
}

void CClrButton::DrawLine( CDC *dc,
long sx,
long sy,
long ex,
long ey,
COLORREF colour)
{
CPen new_pen;
CPen *old_pen;

new_pen.CreatePen(PS_SOLID, 1, colour);
old_pen = dc->SelectObject(&new_pen);
dc->MoveTo(sx, sy);
dc->LineTo(ex, ey);
dc->SelectObject(old_pen);
new_pen.DeleteObject();
}

void CClrButton::DrawButtonText( CDC *dc,
CRect r,
const char *Buf,
COLORREF text_colour)
{
COLORREF previous_colour;

previous_colour = dc->SetTextColor(text_colour);
dc->SetBkMode(TRANSPARENT);
dc->DrawText(Buf, strlen(Buf), r, DT_CENTER | DT_VCENTER | DT_SINGLELINE);
dc->SetTextColor(previous_colour);
}

Downloads

Download demo project -36Kb

Download source – 13Kb

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