button.cpp

A*算法 A*算法 A*算法 A*算法A*算法A*算法

    }
    //else: already has correct style
}

// ----------------------------------------------------------------------------
// helpers
// ----------------------------------------------------------------------------

bool wxButton::SendClickEvent()
{
    wxCommandEvent event(wxEVT_COMMAND_BUTTON_CLICKED, GetId());
    event.SetEventObject(this);

    return ProcessCommand(event);
}

void wxButton::Command(wxCommandEvent & event)
{
    ProcessCommand(event);
}

// ----------------------------------------------------------------------------
// event/message handlers
// ----------------------------------------------------------------------------

bool wxButton::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
{
    bool processed = false;
    switch ( param )
    {
        // NOTE: Apparently older versions (NT 4?) of the common controls send
        //       BN_DOUBLECLICKED but not a second BN_CLICKED for owner-drawn
        //       buttons, so in order to send two EVT_BUTTON events we should
        //       catch both types.  Currently (Feb 2003) up-to-date versions of
        //       win98, win2k and winXP all send two BN_CLICKED messages for
        //       all button types, so we don't catch BN_DOUBLECLICKED anymore
        //       in order to not get 3 EVT_BUTTON events.  If this is a problem
        //       then we need to figure out which version of the comctl32 changed
        //       this behaviour and test for it.

        case 1:                     // message came from an accelerator
        case BN_CLICKED:            // normal buttons send this
            processed = SendClickEvent();
            break;
    }

    return processed;
}

WXLRESULT wxButton::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
{
    // when we receive focus, we want to temporarily become the default button in
    // our parent panel so that pressing "Enter" would activate us -- and when
    // losing it we should restore the previous default button as well
    if ( nMsg == WM_SETFOCUS )
    {
        SetTmpDefault();

        // let the default processing take place too
    }
    else if ( nMsg == WM_KILLFOCUS )
    {
        UnsetTmpDefault();
    }
    else if ( nMsg == WM_LBUTTONDBLCLK )
    {
        // emulate a click event to force an owner-drawn button to change its
        // appearance - without this, it won't do it
        (void)wxControl::MSWWindowProc(WM_LBUTTONDOWN, wParam, lParam);

        // and continue with processing the message normally as well
    }
#if wxUSE_UXTHEME
    else if ( nMsg == WM_THEMECHANGED )
    {
        // need to recalculate the best size here
        // as the theme size might have changed
        InvalidateBestSize();
    }
    else if ( wxUxThemeEngine::GetIfActive() )
    {
        // we need to Refresh() if mouse has entered or left window
        // so we can update the hot tracking state
        // must use m_mouseInWindow here instead of IsMouseInWindow()
        // since we need to know the first time the mouse enters the window
        // and IsMouseInWindow() would return true in this case
        if ( ( nMsg == WM_MOUSEMOVE && !m_mouseInWindow ) ||
             nMsg == WM_MOUSELEAVE )
        {
            Refresh();
        }
        else if ( nMsg == WM_LBUTTONDOWN )
        {
            ::SetCapture(GetHwnd());
        }
    }
#endif // wxUSE_UXTHEME

    // let the base class do all real processing
    return wxControl::MSWWindowProc(nMsg, wParam, lParam);
}

// ----------------------------------------------------------------------------
// owner-drawn buttons support
// ----------------------------------------------------------------------------

#ifdef __WIN32__

// drawing helpers

static void DrawButtonText(HDC hdc,
                           RECT *pRect,
                           const wxString& text,
                           COLORREF col)
{
    COLORREF colOld = SetTextColor(hdc, col);
    int modeOld = SetBkMode(hdc, TRANSPARENT);

    if ( text.find(_T('\n')) != wxString::npos )
    {
        // draw multiline label

        // first we need to compute its bounding rect
        RECT rc;
        ::CopyRect(&rc, pRect);
        ::DrawText(hdc, text, text.length(), &rc, DT_CENTER | DT_CALCRECT);

        // now center this rect inside the entire button area
        const LONG w = rc.right - rc.left;
        const LONG h = rc.bottom - rc.top;
        rc.left = (pRect->right - pRect->left)/2 - w/2;
        rc.right = rc.left+w;
        rc.top = (pRect->bottom - pRect->top)/2 - h/2;
        rc.bottom = rc.top+h;

        ::DrawText(hdc, text, text.length(), &rc, DT_CENTER);
    }
    else // single line label
    {
        // Note: we must have DT_SINGLELINE for DT_VCENTER to work.
        ::DrawText(hdc, text, text.length(), pRect,
                   DT_SINGLELINE | DT_CENTER | DT_VCENTER);
    }

    SetBkMode(hdc, modeOld);
    SetTextColor(hdc, colOld);
}

static void DrawRect(HDC hdc, const RECT& r)
{
    wxDrawLine(hdc, r.left, r.top, r.right, r.top);
    wxDrawLine(hdc, r.right, r.top, r.right, r.bottom);
    wxDrawLine(hdc, r.right, r.bottom, r.left, r.bottom);
    wxDrawLine(hdc, r.left, r.bottom, r.left, r.top);
}

void wxButton::MakeOwnerDrawn()
{
    long style = GetWindowLong(GetHwnd(), GWL_STYLE);
    if ( (style & BS_OWNERDRAW) != BS_OWNERDRAW )
    {
        // make it so
        style |= BS_OWNERDRAW;
        SetWindowLong(GetHwnd(), GWL_STYLE, style);
    }
}

bool wxButton::SetBackgroundColour(const wxColour &colour)
{
    if ( !wxControl::SetBackgroundColour(colour) )
    {
        // nothing to do
        return false;
    }

    MakeOwnerDrawn();

    Refresh();

    return true;
}

bool wxButton::SetForegroundColour(const wxColour &colour)
{
    if ( !wxControl::SetForegroundColour(colour) )
    {
        // nothing to do
        return false;
    }

    MakeOwnerDrawn();

    Refresh();

    return true;
}

/*
   The button frame looks like this normally:

   WWWWWWWWWWWWWWWWWWB
   WHHHHHHHHHHHHHHHHGB  W = white       (HILIGHT)
   WH               GB  H = light grey  (LIGHT)
   WH               GB  G = dark grey   (SHADOW)
   WH               GB  B = black       (DKSHADOW)
   WH               GB
   WGGGGGGGGGGGGGGGGGB
   BBBBBBBBBBBBBBBBBBB

   When the button is selected, the button becomes like this (the total button
   size doesn't change):

   BBBBBBBBBBBBBBBBBBB
   BWWWWWWWWWWWWWWWWBB
   BWHHHHHHHHHHHHHHGBB
   BWH             GBB
   BWH             GBB
   BWGGGGGGGGGGGGGGGBB
   BBBBBBBBBBBBBBBBBBB
   BBBBBBBBBBBBBBBBBBB

   When the button is pushed (while selected) it is like:

   BBBBBBBBBBBBBBBBBBB
   BGGGGGGGGGGGGGGGGGB
   BG               GB
   BG               GB
   BG               GB
   BG               GB
   BGGGGGGGGGGGGGGGGGB
   BBBBBBBBBBBBBBBBBBB
*/

static void DrawButtonFrame(HDC hdc, const RECT& rectBtn,
                            bool selected, bool pushed)
{
    RECT r;
    CopyRect(&r, &rectBtn);

    HPEN hpenBlack   = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_3DDKSHADOW)),
         hpenGrey    = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_3DSHADOW)),
         hpenLightGr = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_3DLIGHT)),
         hpenWhite   = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_3DHILIGHT));

    HPEN hpenOld = (HPEN)SelectObject(hdc, hpenBlack);

    r.right--;
    r.bottom--;

    if ( pushed )
    {
        DrawRect(hdc, r);

        (void)SelectObject(hdc, hpenGrey);
        ::InflateRect(&r, -1, -1);

        DrawRect(hdc, r);
    }
    else // !pushed
    {
        if ( selected )
        {
            DrawRect(hdc, r);

            ::InflateRect(&r, -1, -1);
        }

        wxDrawLine(hdc, r.left, r.bottom, r.right, r.bottom);
        wxDrawLine(hdc, r.right, r.bottom, r.right, r.top - 1);

        (void)SelectObject(hdc, hpenWhite);
        wxDrawLine(hdc, r.left, r.bottom - 1, r.left, r.top);
        wxDrawLine(hdc, r.left, r.top, r.right, r.top);

        (void)SelectObject(hdc, hpenLightGr);
        wxDrawLine(hdc, r.left + 1, r.bottom - 2, r.left + 1, r.top + 1);
        wxDrawLine(hdc, r.left + 1, r.top + 1, r.right - 1, r.top + 1);

        (void)SelectObject(hdc, hpenGrey);
        wxDrawLine(hdc, r.left + 1, r.bottom - 1, r.right - 1, r.bottom - 1);
        wxDrawLine(hdc, r.right - 1, r.bottom - 1, r.right - 1, r.top);
    }

    (void)SelectObject(hdc, hpenOld);
    DeleteObject(hpenWhite);
    DeleteObject(hpenLightGr);
    DeleteObject(hpenGrey);
    DeleteObject(hpenBlack);
}

#if wxUSE_UXTHEME
static
void MSWDrawXPBackground(wxButton *button, WXDRAWITEMSTRUCT *wxdis)
{
    LPDRAWITEMSTRUCT lpDIS = (LPDRAWITEMSTRUCT)wxdis;
    HDC hdc = lpDIS->hDC;
    UINT state = lpDIS->itemState;
    RECT rectBtn;
    CopyRect(&rectBtn, &lpDIS->rcItem);

    wxUxThemeHandle theme(button, L"BUTTON");
    int iState;

    if ( state & ODS_SELECTED )
    {
        iState = PBS_PRESSED;
    }
    else if ( button->HasCapture() || button->IsMouseInWindow() )
    {
        iState = PBS_HOT;
    }
    else if ( state & ODS_FOCUS )
    {
        iState = PBS_DEFAULTED;
    }
    else if ( state & ODS_DISABLED )
    {
        iState = PBS_DISABLED;
    }
    else
    {
        iState = PBS_NORMAL;
    }

    // draw parent background if needed
    if ( wxUxThemeEngine::Get()->IsThemeBackgroundPartiallyTransparent(theme,
                                                                       BP_PUSHBUTTON,
                                                                       iState) )
    {
        wxUxThemeEngine::Get()->DrawThemeParentBackground(GetHwndOf(button), hdc, &rectBtn);
    }

    // draw background
    wxUxThemeEngine::Get()->DrawThemeBackground(theme, hdc, BP_PUSHBUTTON, iState,
                                                &rectBtn, NULL);

    // calculate content area margins
    MARGINS margins;
    wxUxThemeEngine::Get()->GetThemeMargins(theme, hdc, BP_PUSHBUTTON, iState,
                                            TMT_CONTENTMARGINS, &rectBtn, &margins);
    RECT rectClient;
    ::CopyRect(&rectClient, &rectBtn);
    ::InflateRect(&rectClient, -margins.cxLeftWidth, -margins.cyTopHeight);

    // if focused and !nofocus rect
    if ( (state & ODS_FOCUS) && !(state & ODS_NOFOCUSRECT) )
    {
        DrawFocusRect(hdc, &rectClient);
    }

    if ( button->UseBgCol() )
    {
        COLORREF colBg = wxColourToRGB(button->GetBackgroundColour());
        HBRUSH hbrushBackground = ::CreateSolidBrush(colBg);

        // don't overwrite the focus rect
        ::InflateRect(&rectClient, -1, -1);
        FillRect(hdc, &rectClient, hbrushBackground);
        ::DeleteObject(hbrushBackground);
    }
}
#endif // wxUSE_UXTHEME

bool wxButton::MSWOnDraw(WXDRAWITEMSTRUCT *wxdis)
{
    LPDRAWITEMSTRUCT lpDIS = (LPDRAWITEMSTRUCT)wxdis;
    HDC hdc = lpDIS->hDC;
    UINT state = lpDIS->itemState;
    RECT rectBtn;
    CopyRect(&rectBtn, &lpDIS->rcItem);

#if wxUSE_UXTHEME
    if ( wxUxThemeEngine::GetIfActive() )
    {
        MSWDrawXPBackground(this, wxdis);
    }
    else
#endif // wxUSE_UXTHEME
    {
        COLORREF colBg = wxColourToRGB(GetBackgroundColour());

        // first, draw the background
        HBRUSH hbrushBackground = ::CreateSolidBrush(colBg);
        FillRect(hdc, &rectBtn, hbrushBackground);
        ::DeleteObject(hbrushBackground);

        // draw the border for the current state
        bool selected = (state & ODS_SELECTED) != 0;
        if ( !selected )
        {
            wxPanel *panel = wxDynamicCast(GetParent(), wxPanel);
            if ( panel )
            {
                selected = panel->GetDefaultItem() == this;
            }
        }
        bool pushed = (SendMessage(GetHwnd(), BM_GETSTATE, 0, 0) & BST_PUSHED) != 0;

        DrawButtonFrame(hdc, rectBtn, selected, pushed);

        // if focused and !nofocus rect
        if ( (state & ODS_FOCUS) && !(state & ODS_NOFOCUSRECT) )
        {
            RECT rectFocus;
            CopyRect(&rectFocus, &rectBtn);

            // I don't know where does this constant come from, but this is how
            // Windows draws them
            InflateRect(&rectFocus, -4, -4);

            DrawFocusRect(hdc, &rectFocus);
        }

        if ( pushed )
        {
            // the label is shifted by 1 pixel to create "pushed" effect
            OffsetRect(&rectBtn, 1, 1);
        }
    }

    COLORREF colFg = wxColourToRGB(GetForegroundColour());
    DrawButtonText(hdc, &rectBtn,
                   state & ODS_NOACCEL ? wxStripMenuCodes(GetLabel())
                                        : GetLabel(),
                   state & ODS_DISABLED ? GetSysColor(COLOR_GRAYTEXT)
                                        : colFg);

    return true;
}

#endif // __WIN32__

#endif // wxUSE_BUTTON