newbmpbtn.cpp

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

/////////////////////////////////////////////////////////////////////////////
// Name:        newbmpbtn.cpp
// Purpose:     wxNewBitmapButton enhanced bitmap button class.
// Author:      Aleksandras Gluchovas
// Modified by:
// Created:     ??/09/98
// RCS-ID:      $Id: newbmpbtn.cpp,v 1.20 2006/01/17 15:04:46 JS Exp $
// Copyright:   (c) Aleksandras Gluchovas
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif

#include "wx/fl/newbmpbtn.h"
#include "wx/utils.h"     // import wxMin,wxMax macros

#ifdef __WXMSW__
#include "wx/msw/private.h"
#endif

///////////// button-label rendering helpers //////////////////

static int* create_array( int width, int height, int fill = 0 )
{
    int* array = new int[width*height];

    int len = width*height;
    int i;
    for ( i = 0; i != len; ++i )
        array[i] = fill;

    return array;
}

#define GET_ELEM(array,x,y) (array[width*(y)+(x)])

#define MIN_COLOR_DIFF 10

#define IS_IN_ARRAY(x,y) ( (x) < width && (y) < height && (x) >= 0 && (y) >= 0 )

#define GET_RED(col)    col        & 0xFF
#define GET_GREEN(col) (col >> 8)  & 0xFF
#define GET_BLUE(col)  (col >> 16) & 0xFF

#define MAKE_INT_COLOR(red,green,blue) (     (red)                      | \
                                         ( ( (green) << 8 ) & 0xFF00  ) | \
                                         ( ( (blue)  << 16) & 0xFF0000) \
                                       )

#define IS_GREATER(col1,col2) ( ( (GET_RED(col1)  ) > (GET_RED(col2)  ) + MIN_COLOR_DIFF ) && \
                                ( (GET_GREEN(col1)) > (GET_GREEN(col2)) + MIN_COLOR_DIFF ) &&  \
                                ( (GET_BLUE(col1) ) > (GET_BLUE(col2) ) + MIN_COLOR_DIFF )     \
                              )

#define MASK_BG    0
#define MASK_DARK  1
#define MASK_LIGHT 2

// helper function, used internally

static void gray_out_pixmap( int* src, int* dest, int width, int height )
{
    // assuming the pixels along the edges are of the background color

    int x = 0;
    int y = 1;

    do
    {
        int cur       = GET_ELEM(src,x,y);


        if ( IS_IN_ARRAY(x-1,y-1) )
        {
            int upperElem = GET_ELEM(src,x-1,y-1);

            // if the upper element is lighter than current
            if ( IS_GREATER(upperElem,cur) )
            {
                GET_ELEM(dest,x,y) = MASK_DARK;
            }
            else
            // if the current element is ligher than the upper
            if ( IS_GREATER(cur,upperElem) )
            {
                GET_ELEM(dest,x,y) = MASK_LIGHT;
            }
            else
            {
                if ( GET_ELEM(dest,x-1,y-1) == MASK_LIGHT )

                    GET_ELEM(dest,x,y) = MASK_BG;

                if ( GET_ELEM(dest,x-1,y-1 ) == MASK_DARK )

                    GET_ELEM(dest,x,y) = MASK_DARK;
                else
                    GET_ELEM(dest,x,y) = MASK_BG;
            }
        }

        // go zig-zag

        if ( IS_IN_ARRAY(x+1,y-1) )
        {
            ++x;
            --y;
        }
        else
        {
            while ( IS_IN_ARRAY(x-1,y+1) )
            {
                --x;
                ++y;
            }

            if ( IS_IN_ARRAY(x,y+1) )
            {
                ++y;
                continue;
            }
            else
            {
                if ( IS_IN_ARRAY(x+1,y) )
                {
                    ++x;
                    continue;
                }
                else break;
            }
        }

    } while (1);
}

// algorithm for making the image look "grayed" (e.g. disabled button)
// NOTE:: used GetPixel(), which is Windows-Only!

void gray_out_image_on_dc( wxDC& dc, int width, int height )
{
    // assuming the pixels along the edges are of the background color
    wxColour bgCol;
    dc.GetPixel( 0, 0, &bgCol );

    wxPen darkPen ( wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW),1, wxSOLID );
    wxPen lightPen( wxSystemSettings::GetColour(wxSYS_COLOUR_3DHIGHLIGHT),1, wxSOLID );
    wxPen bgPen   ( bgCol,                1, wxSOLID );

    int* src  = create_array( width, height, MASK_BG );
    int* dest = create_array( width, height, MASK_BG );

    int x, y;
    for ( y = 0; y != height; ++y )
    {
        for ( x = 0; x != width; ++x )
        {
            wxColour col;
            dc.GetPixel( x,y, &col );

            GET_ELEM(src,x,y) = MAKE_INT_COLOR( col.Red(), col.Green(), col.Blue() );
        }
    }
    gray_out_pixmap( src, dest, width, height );

    for ( y = 0; y != height; ++y )
    {
        for ( x = 0; x != width; ++x )
        {
            int mask = GET_ELEM(dest,x,y);

            switch (mask)
            {
                case MASK_BG    : { dc.SetPen( bgPen );
                                    dc.DrawPoint( x,y ); break;
                                  }
                case MASK_DARK  : { dc.SetPen( darkPen );
                                    dc.DrawPoint( x,y ); break;
                                  }
                case MASK_LIGHT : { dc.SetPen( lightPen );
                                    dc.DrawPoint( x,y ); break;
                                  }
                default : break;
            }
        }
    }
    delete [] src;
    delete [] dest;
}

///////////////////////////////

/***** Implementation for class wxNewBitmapButton *****/

IMPLEMENT_DYNAMIC_CLASS(wxNewBitmapButton, wxPanel)

BEGIN_EVENT_TABLE( wxNewBitmapButton, wxPanel )

    EVT_LEFT_DOWN   ( wxNewBitmapButton::OnLButtonDown   )
    EVT_LEFT_UP     ( wxNewBitmapButton::OnLButtonUp     )
//    EVT_LEFT_DCLICK ( wxNewBitmapButton::OnLButtonDClick )
    EVT_LEFT_DCLICK ( wxNewBitmapButton::OnLButtonDown )
    EVT_ENTER_WINDOW( wxNewBitmapButton::OnMouseEnter    )
    EVT_LEAVE_WINDOW( wxNewBitmapButton::OnMouseLeave    )

    EVT_SIZE ( wxNewBitmapButton::OnSize  )
    EVT_PAINT( wxNewBitmapButton::OnPaint )

    //EVT_KILL_FOCUS( wxNewBitmapButton::OnKillFocus )

    EVT_ERASE_BACKGROUND( wxNewBitmapButton::OnEraseBackground )

    EVT_IDLE(wxNewBitmapButton::OnIdle)

END_EVENT_TABLE()

wxNewBitmapButton::wxNewBitmapButton( const wxBitmap& labelBitmap,
                                      const wxString& labelText,
                                      int  alignText,
                                      bool isFlat,
                                      int  firedEventType,
                                      int  marginX,
                                      int  marginY,
                                      int  textToLabelGap,
                                      bool isSticky)
    :   mTextToLabelGap  ( textToLabelGap ),
        mMarginX( marginX ),
        mMarginY( marginY ),
        mTextAlignment( alignText ),
        mIsSticky( isSticky ),
        mIsFlat( isFlat ),
        mLabelText( labelText ),
        mImageFileType( wxBITMAP_TYPE_INVALID ),
        mDepressedBmp( labelBitmap ),

        mpDepressedImg( NULL ),
        mpPressedImg  ( NULL ),
        mpDisabledImg ( NULL ),
        mpFocusedImg  ( NULL ),


        mDragStarted  ( false ),
        mIsPressed    ( false ),
        mIsInFocus    ( false ),
        mIsToggled    ( false ),
        mHasFocusedBmp( false ),
        mFiredEventType( firedEventType ),

        mBlackPen( wxColour(  0,  0,  0), 1, wxSOLID ),
        mDarkPen ( wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW), 1, wxSOLID ),
        mGrayPen ( wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE), 1, wxSOLID ),
        mLightPen( wxSystemSettings::GetColour(wxSYS_COLOUR_3DHIGHLIGHT), 1, wxSOLID ),

        mIsCreated( false ),
        mSizeIsSet( false )

{
}

wxNewBitmapButton::wxNewBitmapButton( const wxString& bitmapFileName,
                                      const wxBitmapType  bitmapFileType,
                                      const wxString& labelText,
                                      int  alignText,
                                      bool isFlat,
                                      int  WXUNUSED(firedEventType),
                                      int  WXUNUSED(marginX),
                                      int  WXUNUSED(marginY),
                                      int  WXUNUSED(textToLabelGap),
                                      bool WXUNUSED(isSticky))

    :   mTextToLabelGap  ( 2 ),
        mMarginX( 2 ),
        mMarginY( 2 ),
        mTextAlignment( alignText ),
        mIsSticky( false ),
        mIsFlat( isFlat ),
        mLabelText( labelText ),
        mImageFileName( bitmapFileName ),
        mImageFileType( bitmapFileType ),

        mpDepressedImg( NULL ),
        mpPressedImg  ( NULL ),
        mpDisabledImg ( NULL ),
        mpFocusedImg  ( NULL ),

        mDragStarted  ( false ),
        mIsPressed    ( false ),
        mIsInFocus    ( false ),
        mIsToggled    ( false ),
        mHasFocusedBmp( false ),
        mFiredEventType( wxEVT_COMMAND_MENU_SELECTED ),

        mBlackPen( wxColour(  0,  0,  0), 1, wxSOLID ),
        mDarkPen ( wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW), 1, wxSOLID ),
        mGrayPen ( wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE), 1, wxSOLID ),
        mLightPen( wxSystemSettings::GetColour(wxSYS_COLOUR_3DHIGHLIGHT), 1, wxSOLID ),

        mIsCreated( false ),
        mSizeIsSet( false )

{
}

wxNewBitmapButton::~wxNewBitmapButton(void)
{
    DestroyLabels();
}

void wxNewBitmapButton::DrawShade( int outerLevel,
                                   wxDC&  dc,
                                   wxPen& upperLeftSidePen,
                                   wxPen& lowerRightSidePen )
{
    wxBitmap* pBmp = GetStateLabel();
    int x = mMarginX - (outerLevel + 2);
    int y = mMarginY - (outerLevel + 2);
    int height = pBmp->GetHeight() + (outerLevel + 2)*2 - 1;
    int width  = pBmp->GetWidth()  + (outerLevel + 2)*2 - 1;
    dc.SetPen( upperLeftSidePen );
    dc.DrawLine( x,y, x + width, y  );
    dc.DrawLine( x,y, x, y + height );
    dc.DrawLine( x,y+1, x + width , y +1 );  // top
    dc.DrawLine( x+1,y, x+1, y + height );  // left

    dc.SetPen( lowerRightSidePen );
    dc.DrawLine( x + width, y, x + width, y + height + 1  );
    dc.DrawLine( x, y + height, x + width, y + height );
    dc.DrawLine( x + width-1, y+1, x + width-1, y + height +1  );  // right
    dc.DrawLine( x +1, y + height-1, x + width, y + height-1 );  // bottom
}

void wxNewBitmapButton::DestroyLabels()
{
    if ( mpDepressedImg ) delete mpDepressedImg;
    if ( mpPressedImg   ) delete mpPressedImg;
    if ( mpDisabledImg  ) delete mpDisabledImg;
    if ( mpFocusedImg   ) delete mpFocusedImg;

    mpDepressedImg = NULL;
    mpPressedImg   = NULL;
    mpDisabledImg  = NULL;
    mpFocusedImg   = NULL;
}

wxBitmap* wxNewBitmapButton::GetStateLabel()
{
    if ( IsEnabled() )
    {
        if ( mIsPressed )
        {
            return mpPressedImg;
        }
        else
        {
            if ( mIsInFocus )
            {
                if ( mHasFocusedBmp )

                    return mpFocusedImg;
                else
                    return mpDepressedImg;
            }
            else
                return mpDepressedImg;
        }
    }
    else
        return mpDisabledImg;
}

#ifndef __WXMSW__

static const unsigned char _gDisableImage[] = { 0x55,0xAA,0x55,0xAA,
                                              0x55,0xAA,0x55,0xAA,
                                              0x55,0xAA,0x55,0xAA,
                                              0x55,0xAA,0x55,0xAA
                                            };

#endif

void wxNewBitmapButton::RenderLabelImage( wxBitmap*& destBmp, wxBitmap* srcBmp,
                                          bool isEnabled, bool isPressed )
{
    if ( destBmp != 0 ) return;

    // render labels on-demand

    wxMemoryDC srcDc;
    srcDc.SelectObject( *srcBmp );

    bool hasText = ( mTextAlignment != NB_NO_TEXT ) &&
                   ( mLabelText.length() != 0 );

    bool hasImage = (mTextAlignment != NB_NO_IMAGE);

    wxSize destDim;
    wxPoint txtPos;
    wxPoint imgPos;

    if ( hasText )
    {
        long txtWidth, txtHeight;

        srcDc.SetFont( wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT) );
        srcDc.GetTextExtent( mLabelText, &txtWidth, &txtHeight );

        if ( mTextAlignment == NB_ALIGN_TEXT_RIGHT )
        {
            destDim.x = srcBmp->GetWidth() + 2*mTextToLabelGap + txtWidth;

            destDim.y =
                wxMax( srcBmp->GetHeight(), txtHeight );

            txtPos.x = srcBmp->GetWidth() + mTextToLabelGap;
            txtPos.y = (destDim.y - txtHeight)/2;
            imgPos.x = 0;
            imgPos.y = (destDim.y - srcBmp->GetHeight())/2;
        }