newbmpbtn.cpp

wxGTK 是 wxWidgets 的 linux GTK+ (>2.2.3)版本。wxWidgets 是一个跨平台的 GUI 框架

        else
        if ( mTextAlignment == NB_ALIGN_TEXT_BOTTOM )
        {
            destDim.x =
                wxMax( srcBmp->GetWidth(), txtWidth );

            destDim.y = srcBmp->GetHeight() + mTextToLabelGap + txtHeight;

            txtPos.x = (destDim.x - txtWidth)/2;
            txtPos.y = srcBmp->GetHeight() + mTextToLabelGap;
            imgPos.x = (destDim.x - srcBmp->GetWidth())/2;
            imgPos.y = 0;
        }
        else
        {
            wxFAIL_MSG(wxT("Unsupported FL alignment type detected in wxNewBitmapButton::RenderLabelImage()"));
        }
    }
    else
    {
        imgPos.x = 0;
        imgPos.y = 0;
        destDim.x = srcBmp->GetWidth();
        destDim.y = srcBmp->GetHeight();
    }

    destBmp = new wxBitmap( int(destDim.x), int(destDim.y) );

    wxMemoryDC destDc;
    destDc.SelectObject( *destBmp );

    wxBrush grayBrush( wxSystemSettings::GetColour( wxSYS_COLOUR_3DFACE), wxSOLID );

    destDc.SetBrush( grayBrush );
    destDc.SetPen( *wxTRANSPARENT_PEN );
    destDc.DrawRectangle( 0,0, destDim.x+1, destDim.y+1 );

    if ( isPressed )
    {
        ++imgPos.x; ++imgPos.y;
        ++txtPos.x; ++txtPos.y;
    }

    if ( hasImage )
    {

        destDc.Blit( imgPos.x, imgPos.y,
                 srcBmp->GetWidth(),
                 srcBmp->GetHeight(),
                 &srcDc, 0,0, wxCOPY,true );
    }

    if ( hasText )
    {
        wxWindow* pTopWnd = this;

        do
        {
            wxWindow* pParent = pTopWnd->GetParent();

            if ( pParent == 0 )
                break;

            pTopWnd = pParent;
        } while (1);

        destDc.SetFont( wxSystemSettings::GetFont( wxSYS_DEFAULT_GUI_FONT) );

        if ( isEnabled )
        {
            destDc.SetTextForeground( wxSystemSettings::GetColour(wxSYS_COLOUR_BTNTEXT) );
        }
        else
        {
            destDc.SetTextForeground( wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW) );
        }
        destDc.SetTextBackground( wxSystemSettings::GetColour(wxSYS_COLOUR_BTNFACE) );

        destDc.DrawText( mLabelText, txtPos.x, txtPos.y );
    }

    if ( !isEnabled ){

#ifdef __WXMSW__ // This is currently MSW specific
        gray_out_image_on_dc( destDc, destDim.x, destDim.y );
#else
        wxBitmap bmp( (const char*)_gDisableImage,8,8);
        wxBrush checkerBrush(bmp);
        checkerBrush.SetColour( wxSystemSettings::GetColour( wxSYS_COLOUR_BTNFACE ) );
        destDc.SetBrush( checkerBrush );
        destDc.DrawRectangle( imgPos.x, imgPos.y, srcBmp->GetWidth()+1, srcBmp->GetHeight()+1);
#endif
    }
    // adjust button size to fit the new dimensions of the label
    if ( !mSizeIsSet && 0 )
    {
        mSizeIsSet = true;
        SetSize( wxDefaultCoord, wxDefaultCoord,
                 destBmp->GetWidth()  + mMarginX*2,
                 destBmp->GetHeight() + mMarginY*2, 0
            );
    }
    destDc.SelectObject( wxNullBitmap );

#if defined(__WXMSW__) && !defined(__WXUNIVERSAL__)
    // Map to system colours
    (void) wxToolBar::MapBitmap(destBmp->GetHBITMAP(), destBmp->GetWidth(), destBmp->GetHeight());
#endif
}

void wxNewBitmapButton::RenderAllLabelImages()
{
    if ( !mIsCreated )
        return;
    RenderLabelImage( mpDisabledImg, &mDepressedBmp, false );
    RenderLabelImage( mpPressedImg,   &mDepressedBmp, true, true );
    RenderLabelImage( mpDepressedImg, &mDepressedBmp, true, false );
    if ( mHasFocusedBmp )
    {
        RenderLabelImage( mpFocusedImg, &mFocusedBmp, true, false );
    }
}


void wxNewBitmapButton::RenderLabelImages()
{
    if ( !mIsCreated )
        return;

    if ( !IsEnabled() )
    {
        RenderLabelImage( mpDisabledImg, &mDepressedBmp, false );
    }
    else

    if ( mIsPressed )

        RenderLabelImage( mpPressedImg,   &mDepressedBmp, true, true );
    else
    {
        if ( mIsInFocus )
        {
            if ( mHasFocusedBmp )
                RenderLabelImage( mpFocusedImg, &mFocusedBmp, true, false );
            else
                RenderLabelImage( mpDepressedImg, &mDepressedBmp, true, false );
        }
        else
            RenderLabelImage( mpDepressedImg, &mDepressedBmp, true, false );
    }
}

bool wxNewBitmapButton::Toggle(bool enable)
{
    if ( mIsToggled == enable )
    {
        return false;
    }

    mIsToggled = enable;
    Refresh();

    return true;
}

bool wxNewBitmapButton::Enable(bool enable)
{
    if ( enable != m_isEnabled )
    {
        if ( mIsInFocus )
        {
            mIsInFocus = false;
        }

        if ( mIsPressed )
        {
            mIsPressed = false;
        }

        Refresh();
    }

    return wxPanel::Enable( enable );
}

void wxNewBitmapButton::DrawDecorations( wxDC& dc )
{
    if ( mIsFlat )
    {
        DrawShade( 1, dc, mGrayPen,  mGrayPen  );
        if ( mIsToggled )
        {
            DrawShade( 0, dc, mDarkPen,  mLightPen  );
        }
        else if ( mIsInFocus )
        {
            if ( mIsPressed )
                DrawShade( 0, dc, mDarkPen,  mLightPen  );
            else
                DrawShade( 0, dc, mLightPen,  mDarkPen  );
        }
        else
            DrawShade( 0, dc, mGrayPen,  mGrayPen  );
    }
    else
    {
        if ( mIsPressed || mIsToggled )
        {
            DrawShade( 0, dc, mDarkPen,  mGrayPen  );
            DrawShade( 1, dc, mBlackPen, mLightPen );
        }
        else
        {
            DrawShade( 0, dc, mGrayPen,  mDarkPen  );
            DrawShade( 1, dc, mLightPen, mBlackPen );
        }
    }
}

void wxNewBitmapButton::SetLabel(const wxBitmap& labelBitmap,
                                 const wxString& labelText )
{
    DestroyLabels();

    mLabelText    = labelText;
    mDepressedBmp = labelBitmap;

    //RenderLabelImages();
    RenderAllLabelImages();
}

void wxNewBitmapButton::SetAlignments( int alignText,
                                       int marginX,
                                       int marginY,
                                       int textToLabelGap)
{
    DestroyLabels();

    mMarginX        = marginX;
    mMarginY        = marginY;
    mTextAlignment  = alignText;
    mTextToLabelGap = textToLabelGap;

    //RenderLabelImages();
    RenderAllLabelImages();
}

// event handlers

void wxNewBitmapButton::OnLButtonDown( wxMouseEvent& WXUNUSED(event) )
{
    mDragStarted      = true;
    mIsPressed        = true;
    Refresh();
}

void wxNewBitmapButton::OnLButtonUp( wxMouseEvent& event )
{
    if ( !mDragStarted )
        return;

    mDragStarted = false;
    mIsPressed   = false;
    Refresh();

    if ( IsInWindow( event.m_x, event.m_y ) )
    {
        // fire event, if mouse was released
        // within the bounds of button
        wxCommandEvent cmd( mFiredEventType, GetId() );
        GetParent()->ProcessEvent( cmd );
    }
}

bool wxNewBitmapButton::IsInWindow( int x, int y )
{
    int width, height;
    GetSize( &width, &height );

    return ( x >= 0 && y >= 0 &&
             x < width &&
             y < height );
}

void wxNewBitmapButton::OnMouseEnter( wxMouseEvent& WXUNUSED(event) )
{
    bool prevIsInFocus = mIsInFocus;

    if ( !mIsInFocus )
    {
        mIsInFocus = true;
    }
    if ( prevIsInFocus != mIsInFocus )
    {
        Refresh();
    }
}

void wxNewBitmapButton::OnMouseLeave( wxMouseEvent& WXUNUSED(event) )
{
    bool prevIsInFocus = mIsInFocus;
    bool prevIsPressed = mIsPressed;
    if ( mIsInFocus )
    {
        mIsInFocus = false;
        mIsPressed = false;
    }
    if ( prevIsInFocus != mIsInFocus || prevIsPressed != mIsPressed )
    {
        Refresh();
    }
}

void wxNewBitmapButton::OnSize( wxSizeEvent& WXUNUSED(event) )
{
        //Reshape();
}

void wxNewBitmapButton::Reshape( )
{
    bool wasCreated = mIsCreated;
    mIsCreated = true;

    if ( !wasCreated )
    {
        // in the case of loading button from stream, check if we
        // have non-empty image-file name, load if possible

        if (!mImageFileName.empty())
        {
            mDepressedBmp.LoadFile( mImageFileName, mImageFileType );

            //wxMessageBox("Image Loaded!!!");
        }

        //RenderLabelImages();
        RenderAllLabelImages();

        wxBitmap* pCurImg = GetStateLabel();

        int w = pCurImg->GetWidth(),
            h = pCurImg->GetHeight();

        SetSize( 0,0, w + mMarginX*2, h + mMarginY*2 , 0 );
    }
}

void wxNewBitmapButton::DrawLabel( wxDC& dc )
{
    wxBitmap* pCurBmp = GetStateLabel();

    if ( pCurBmp == NULL )
    {
        wxSizeEvent evt;
        OnSize( evt ); // fake it up!

        //RenderLabelImages();
        pCurBmp = GetStateLabel();
    }

    wxMemoryDC mdc;
    mdc.SelectObject( *pCurBmp );

    dc.Blit( mMarginX, mMarginY,
             pCurBmp->GetWidth(),
             pCurBmp->GetHeight(),
             &mdc, 0,0, wxCOPY
           );

    mdc.SelectObject( wxNullBitmap );
}

void wxNewBitmapButton::OnPaint( wxPaintEvent& WXUNUSED(event) )
{
    wxPaintDC dc(this);

    // first, make sure images for current state are prepared
    //RenderLabelImages();

    DrawLabel( dc );

    DrawDecorations( dc );
}

void wxNewBitmapButton::OnEraseBackground( wxEraseEvent& WXUNUSED(event) )
{
    // do nothing
}

void wxNewBitmapButton::OnKillFocus( wxFocusEvent& WXUNUSED(event) )
{
    // useless

    wxMessageBox(wxT("kill-focus for button!"));
}

// ----------------------------------------------------------------------------
// UI updates
// ----------------------------------------------------------------------------

void wxNewBitmapButton::OnIdle(wxIdleEvent& event)
{
    DoButtonUpdate();

    event.Skip();
}

// Do the toolbar button updates (check for EVT_UPDATE_UI handlers)
void wxNewBitmapButton::DoButtonUpdate()
{
    wxUpdateUIEvent event(GetId());
    event.SetEventObject(this);

    if ( GetParent()->ProcessEvent(event) )
    {
        if ( event.GetSetEnabled() )
        {
            bool enabled = event.GetEnabled();
            if ( enabled != IsEnabled() )
                Enable( enabled );
        }
        if ( event.GetSetChecked() )
            Toggle( event.GetChecked() );
    }
}