この記事は John Wellbelove の投稿です。
Environment: VC6
このクラスは 1998/08/06 の Bob Ryan の CColorButton コードをもとにしている。
主な修正は、通常のオーナードローでないボタンと同じような見た目のボタンを作るところだ。
この最後まで、デフォルトの色は GetSysColor 関数を通して現在の Windows 設定を調べることで、コンストラクタ内でセットしている。
色は SetColour か SetColor のようなものを２つか３つのパラメータとともに呼び出せばセットできるだろう。
最初はテキストの色だ。２番目は背景色。オプションだが３番目は無効ボタンの背景色である。
ボタンは ResetColour() か ResetColor() を呼び出せば Windows のデフォルトにセットできる。
デモアプリではこれらの変更をすべてやっている。
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);
}