Files
wxWidgets/src/generic/colrdlgg.cpp
2016-02-24 19:33:38 +01:00

752 lines
22 KiB
C++

/////////////////////////////////////////////////////////////////////////////
// Name: src/generic/colrdlgg.cpp
// Purpose: Choice dialogs
// Author: Julian Smart
// Modified by:
// Created: 04/01/98
// Copyright: (c) Julian Smart
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#if wxUSE_COLOURDLG
#ifndef WX_PRECOMP
#include "wx/settings.h"
#include "wx/utils.h"
#include "wx/intl.h"
#include "wx/dialog.h"
#include "wx/listbox.h"
#include "wx/button.h"
#include "wx/stattext.h"
#include "wx/layout.h"
#include "wx/dcclient.h"
#include "wx/sizer.h"
#include "wx/slider.h"
#endif
#if wxUSE_STATLINE
#include "wx/statline.h"
#endif
#include "wx/colourdata.h"
#include "wx/generic/colrdlgg.h"
#if wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
#include "wx/statbmp.h"
#include "wx/dcmemory.h"
#include "wx/dcgraph.h"
#endif // wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
#define wxID_ADD_CUSTOM 3000
#if wxUSE_SLIDER
#define wxID_RED_SLIDER 3001
#define wxID_GREEN_SLIDER 3002
#define wxID_BLUE_SLIDER 3003
#endif // wxUSE_SLIDER
wxIMPLEMENT_DYNAMIC_CLASS(wxGenericColourDialog, wxDialog);
wxBEGIN_EVENT_TABLE(wxGenericColourDialog, wxDialog)
EVT_BUTTON(wxID_ADD_CUSTOM, wxGenericColourDialog::OnAddCustom)
#if wxUSE_SLIDER
EVT_SLIDER(wxID_RED_SLIDER, wxGenericColourDialog::OnRedSlider)
EVT_SLIDER(wxID_GREEN_SLIDER, wxGenericColourDialog::OnGreenSlider)
EVT_SLIDER(wxID_BLUE_SLIDER, wxGenericColourDialog::OnBlueSlider)
#endif
EVT_PAINT(wxGenericColourDialog::OnPaint)
EVT_MOUSE_EVENTS(wxGenericColourDialog::OnMouseEvent)
EVT_CLOSE(wxGenericColourDialog::OnCloseWindow)
wxEND_EVENT_TABLE()
/*
* Generic wxColourDialog
*/
// don't change the number of elements (48) in this array, the code below is
// hardcoded to use it
static const wxChar *const wxColourDialogNames[] =
{
wxT("ORANGE"),
wxT("GOLDENROD"),
wxT("WHEAT"),
wxT("SPRING GREEN"),
wxT("SKY BLUE"),
wxT("SLATE BLUE"),
wxT("MEDIUM VIOLET RED"),
wxT("PURPLE"),
wxT("RED"),
wxT("YELLOW"),
wxT("MEDIUM SPRING GREEN"),
wxT("PALE GREEN"),
wxT("CYAN"),
wxT("LIGHT STEEL BLUE"),
wxT("ORCHID"),
wxT("LIGHT MAGENTA"),
wxT("BROWN"),
wxT("YELLOW"),
wxT("GREEN"),
wxT("CADET BLUE"),
wxT("MEDIUM BLUE"),
wxT("MAGENTA"),
wxT("MAROON"),
wxT("ORANGE RED"),
wxT("FIREBRICK"),
wxT("CORAL"),
wxT("FOREST GREEN"),
wxT("AQUAMARINE"),
wxT("BLUE"),
wxT("NAVY"),
wxT("THISTLE"),
wxT("MEDIUM VIOLET RED"),
wxT("INDIAN RED"),
wxT("GOLD"),
wxT("MEDIUM SEA GREEN"),
wxT("MEDIUM BLUE"),
wxT("MIDNIGHT BLUE"),
wxT("GREY"),
wxT("PURPLE"),
wxT("KHAKI"),
wxT("BLACK"),
wxT("MEDIUM FOREST GREEN"),
wxT("KHAKI"),
wxT("DARK GREY"),
wxT("SEA GREEN"),
wxT("LIGHT GREY"),
wxT("MEDIUM SLATE BLUE"),
wxT("WHITE")
};
wxGenericColourDialog::wxGenericColourDialog()
{
m_whichKind = 1;
m_colourSelection = -1;
}
wxGenericColourDialog::wxGenericColourDialog(wxWindow *parent,
wxColourData *data)
{
m_whichKind = 1;
m_colourSelection = -1;
Create(parent, data);
}
wxGenericColourDialog::~wxGenericColourDialog()
{
}
void wxGenericColourDialog::OnCloseWindow(wxCloseEvent& WXUNUSED(event))
{
EndModal(wxID_CANCEL);
}
bool wxGenericColourDialog::Create(wxWindow *parent, wxColourData *data)
{
if ( !wxDialog::Create(GetParentForModalDialog(parent, 0), wxID_ANY,
_("Choose colour"),
wxPoint(0, 0), wxSize(900, 900)) )
return false;
if (data)
m_colourData = *data;
InitializeColours();
CalculateMeasurements();
CreateWidgets();
return true;
}
int wxGenericColourDialog::ShowModal()
{
return wxDialog::ShowModal();
}
// Internal functions
void wxGenericColourDialog::OnMouseEvent(wxMouseEvent& event)
{
if (event.ButtonDown(wxMOUSE_BTN_LEFT))
{
int x = (int)event.GetX();
int y = (int)event.GetY();
if ((x >= m_standardColoursRect.x && x <= (m_standardColoursRect.x + m_standardColoursRect.width)) &&
(y >= m_standardColoursRect.y && y <= (m_standardColoursRect.y + m_standardColoursRect.height)))
{
int selX = (int)(x - m_standardColoursRect.x)/(m_smallRectangleSize.x + m_gridSpacing);
int selY = (int)(y - m_standardColoursRect.y)/(m_smallRectangleSize.y + m_gridSpacing);
int ptr = (int)(selX + selY*8);
OnBasicColourClick(ptr);
}
// wxStaticBitmap (used to ARGB preview) events are handled in the dedicated handler.
#if !wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
else if ((x >= m_customColoursRect.x && x <= (m_customColoursRect.x + m_customColoursRect.width)) &&
(y >= m_customColoursRect.y && y <= (m_customColoursRect.y + m_customColoursRect.height)))
{
int selX = (int)(x - m_customColoursRect.x)/(m_smallRectangleSize.x + m_gridSpacing);
int selY = (int)(y - m_customColoursRect.y)/(m_smallRectangleSize.y + m_gridSpacing);
int ptr = (int)(selX + selY*8);
OnCustomColourClick(ptr);
}
#endif
else
event.Skip();
}
else
event.Skip();
}
#if wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
void wxGenericColourDialog::OnCustomColourMouseClick(wxMouseEvent& event)
{
// Find index of custom colour
// and call the handler.
for (unsigned i = 0; i < WXSIZEOF(m_customColoursBmp); i++)
{
if ( m_customColoursBmp[i]->GetId() == event.GetId() )
{
OnCustomColourClick(i);
return;
}
}
event.Skip();
}
#endif // wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
void wxGenericColourDialog::OnPaint(wxPaintEvent& WXUNUSED(event))
{
wxPaintDC dc(this);
PaintBasicColours(dc);
// wxStaticBitmap controls are updated on their own.
#if !wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
PaintCustomColours(dc, -1);
PaintCustomColour(dc);
#endif // !wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
PaintHighlight(dc, true);
}
void wxGenericColourDialog::CalculateMeasurements()
{
// For single customizable colour
const wxSize customRectangleSize(40, 40);
m_smallRectangleSize.Set(18, 14);
m_gridSpacing = 6;
m_sectionSpacing = 15;
m_standardColoursRect.x = 10;
m_standardColoursRect.y = 15;
m_standardColoursRect.width = (8*m_smallRectangleSize.x) + (7*m_gridSpacing);
m_standardColoursRect.height = (6*m_smallRectangleSize.y) + (5*m_gridSpacing);
m_customColoursRect.x = m_standardColoursRect.x;
m_customColoursRect.y = m_standardColoursRect.y + m_standardColoursRect.height + 20;
m_customColoursRect.width = (8*m_smallRectangleSize.x) + (7*m_gridSpacing);
m_customColoursRect.height = (2*m_smallRectangleSize.y) + (1*m_gridSpacing);
m_singleCustomColourRect.x = m_customColoursRect.width + m_customColoursRect.x + m_sectionSpacing;
m_singleCustomColourRect.y = 80;
m_singleCustomColourRect.SetSize(customRectangleSize);
m_okButtonX = 10;
m_customButtonX = m_singleCustomColourRect.x ;
m_buttonY = m_customColoursRect.y + m_customColoursRect.height + 10;
}
void wxGenericColourDialog::CreateWidgets()
{
wxBeginBusyCursor();
#if wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
// Bitmap to preview selected colour (with alpha channel)
wxBitmap customColourBmp(m_singleCustomColourRect.GetSize(), 32);
customColourBmp.UseAlpha();
DoPreviewBitmap(customColourBmp, m_colourData.GetColour());
m_customColourBmp = new wxStaticBitmap(this, wxID_ANY, customColourBmp,
m_singleCustomColourRect.GetLeftTop(),
m_singleCustomColourRect.GetSize(),
wxBORDER_SUNKEN);
// 16 bitmaps to preview custom colours (with alpha channel)
for (unsigned i = 0; i < WXSIZEOF(m_customColoursBmp); i++)
{
int x = ((i % 8)*(m_smallRectangleSize.x+m_gridSpacing)) + m_customColoursRect.x;
int y = ((i / 8)*(m_smallRectangleSize.y+m_gridSpacing)) + m_customColoursRect.y;
wxBitmap bmp(m_smallRectangleSize, 32);
bmp.UseAlpha();
DoPreviewBitmap(bmp, m_customColours[i]);
m_customColoursBmp[i] = new wxStaticBitmap(this, wxID_ANY, bmp,
wxPoint(x, y), m_smallRectangleSize);
m_customColoursBmp[i]->Bind(wxEVT_LEFT_DOWN,
&wxGenericColourDialog::OnCustomColourMouseClick, this);
}
#endif // wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
wxBoxSizer *topSizer = new wxBoxSizer( wxVERTICAL );
const int sliderHeight = 160;
// first sliders
#if wxUSE_SLIDER
const int sliderX = m_singleCustomColourRect.x + m_singleCustomColourRect.width + m_sectionSpacing;
wxColour c = m_colourData.GetColour();
m_redSlider = new wxSlider(this, wxID_RED_SLIDER, c.Red(), 0, 255,
wxDefaultPosition, wxSize(wxDefaultCoord, sliderHeight), wxSL_VERTICAL|wxSL_LABELS|wxSL_INVERSE);
m_greenSlider = new wxSlider(this, wxID_GREEN_SLIDER, c.Green(), 0, 255,
wxDefaultPosition, wxSize(wxDefaultCoord, sliderHeight), wxSL_VERTICAL|wxSL_LABELS|wxSL_INVERSE);
m_blueSlider = new wxSlider(this, wxID_BLUE_SLIDER, c.Blue(), 0, 255,
wxDefaultPosition, wxSize(wxDefaultCoord, sliderHeight), wxSL_VERTICAL|wxSL_LABELS|wxSL_INVERSE);
if ( m_colourData.GetChooseAlpha() )
{
m_alphaSlider = new wxSlider(this, wxID_ANY, c.Alpha(), 0, 255,
wxDefaultPosition, wxSize(wxDefaultCoord, sliderHeight), wxSL_VERTICAL|wxSL_LABELS|wxSL_INVERSE);
m_alphaSlider->Bind(wxEVT_SLIDER, &wxGenericColourDialog::OnAlphaSlider, this);
}
else
{
m_alphaSlider = NULL;
}
wxBoxSizer *sliderSizer = new wxBoxSizer( wxHORIZONTAL );
sliderSizer->Add(sliderX, sliderHeight );
const wxSizerFlags sliderLabelFlags = wxSizerFlags().Right().Border();
const wxSizerFlags onesliderFlags = wxSizerFlags().CenterHorizontal();
const wxSizerFlags sliderFlags
= wxSizerFlags().CentreVertical().DoubleBorder();
wxBoxSizer *redSliderSizer = new wxBoxSizer(wxVERTICAL);
redSliderSizer->Add(new wxStaticText(this, wxID_ANY, _("Red:")), sliderLabelFlags);
redSliderSizer->Add(m_redSlider, onesliderFlags);
wxBoxSizer *greenSliderSizer = new wxBoxSizer(wxVERTICAL);
greenSliderSizer->Add(new wxStaticText(this, wxID_ANY, _("Green:")), sliderLabelFlags);
greenSliderSizer->Add(m_greenSlider, onesliderFlags);
wxBoxSizer *blueSliderSizer = new wxBoxSizer(wxVERTICAL);
blueSliderSizer->Add(new wxStaticText(this, wxID_ANY, _("Blue:")), sliderLabelFlags);
blueSliderSizer->Add(m_blueSlider, onesliderFlags);
sliderSizer->Add(redSliderSizer, sliderFlags);
sliderSizer->Add(greenSliderSizer, sliderFlags);
sliderSizer->Add(blueSliderSizer, sliderFlags);
if ( m_colourData.GetChooseAlpha() )
{
wxBoxSizer *alphaSliderSizer = new wxBoxSizer(wxVERTICAL);
alphaSliderSizer->Add(new wxStaticText(this, wxID_ANY, _("Opacity:")), sliderLabelFlags);
alphaSliderSizer->Add(m_alphaSlider, onesliderFlags);
sliderSizer->Add(alphaSliderSizer, sliderFlags);
}
topSizer->Add(sliderSizer, wxSizerFlags().Centre().DoubleBorder());
#else
topSizer->Add(1, sliderHeight, wxSizerFlags(1).Centre().TripleBorder());
#endif // wxUSE_SLIDER
// then the custom button
topSizer->Add(new wxButton(this, wxID_ADD_CUSTOM,
_("Add to custom colours") ),
wxSizerFlags().DoubleHorzBorder());
// then the standard buttons
wxSizer *buttonsizer = CreateSeparatedButtonSizer(wxOK | wxCANCEL);
if ( buttonsizer )
{
topSizer->Add(buttonsizer, wxSizerFlags().Expand().DoubleBorder());
}
SetAutoLayout( true );
SetSizer( topSizer );
topSizer->SetSizeHints( this );
topSizer->Fit( this );
Centre( wxBOTH );
wxEndBusyCursor();
}
void wxGenericColourDialog::InitializeColours(void)
{
size_t i;
for (i = 0; i < WXSIZEOF(wxColourDialogNames); i++)
{
wxColour col = wxTheColourDatabase->Find(wxColourDialogNames[i]);
if (col.IsOk())
m_standardColours[i].Set(col.Red(), col.Green(), col.Blue());
else
m_standardColours[i].Set(0, 0, 0);
}
for (i = 0; i < WXSIZEOF(m_customColours); i++)
{
wxColour c = m_colourData.GetCustomColour(i);
if (c.IsOk())
m_customColours[i] = m_colourData.GetCustomColour(i);
else
m_customColours[i] = wxColour(255, 255, 255);
}
wxColour curr = m_colourData.GetColour();
if ( curr.IsOk() )
{
bool m_initColourFound = false;
for (i = 0; i < WXSIZEOF(wxColourDialogNames); i++)
{
if ( m_standardColours[i] == curr && !m_initColourFound )
{
m_whichKind = 1;
m_colourSelection = i;
m_initColourFound = true;
break;
}
}
if ( !m_initColourFound )
{
for ( i = 0; i < WXSIZEOF(m_customColours); i++ )
{
if ( m_customColours[i] == curr )
{
m_whichKind = 2;
m_colourSelection = i;
break;
}
}
}
m_colourData.SetColour(curr);
}
else
{
m_whichKind = 1;
m_colourSelection = 0;
m_colourData.SetColour(wxColour(0, 0, 0));
}
}
void wxGenericColourDialog::PaintBasicColours(wxDC& dc)
{
int i;
for (i = 0; i < 6; i++)
{
int j;
for (j = 0; j < 8; j++)
{
int ptr = i*8 + j;
int x = (j*(m_smallRectangleSize.x+m_gridSpacing) + m_standardColoursRect.x);
int y = (i*(m_smallRectangleSize.y+m_gridSpacing) + m_standardColoursRect.y);
dc.SetPen(*wxBLACK_PEN);
wxBrush brush(m_standardColours[ptr]);
dc.SetBrush(brush);
dc.DrawRectangle( x, y, m_smallRectangleSize.x, m_smallRectangleSize.y);
}
}
}
#if !wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
void wxGenericColourDialog::PaintCustomColours(wxDC& dc, int clrIndex)
{
int idxStart;
int idxEnd;
// For clrIndex == -1 redraw all custom colours
if ( clrIndex < 0 || static_cast<unsigned>(clrIndex) >= WXSIZEOF(m_customColours) )
{
idxStart = 0;
idxEnd = WXSIZEOF(m_customColours) - 1;
}
else
{
idxStart = clrIndex;
idxEnd = clrIndex;
}
for (int i = idxStart; i <= idxEnd; i++)
{
int x = ((i % 8)*(m_smallRectangleSize.x+m_gridSpacing)) + m_customColoursRect.x;
int y = ((i / 8)*(m_smallRectangleSize.y+m_gridSpacing)) + m_customColoursRect.y;
dc.SetPen(*wxBLACK_PEN);
wxBrush brush(m_customColours[i]);
dc.SetBrush(brush);
dc.DrawRectangle(x, y, m_smallRectangleSize.x, m_smallRectangleSize.y);
}
}
#endif // !wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
void wxGenericColourDialog::PaintHighlight(wxDC& dc, bool draw)
{
if ( m_colourSelection < 0 )
return;
wxRect r(m_smallRectangleSize);
if (m_whichKind == 1)
{
// Standard colours
r.Offset(m_standardColoursRect.GetLeftTop());
}
else
{
// User-defined colours
r.Offset(m_customColoursRect.GetLeftTop());
}
const int x = (m_colourSelection % 8) * (m_smallRectangleSize.x + m_gridSpacing);
const int y = (m_colourSelection / 8) * (m_smallRectangleSize.y + m_gridSpacing);
r.Offset(x, y);
// Highlight is drawn with rectangle bigger than the item rectangle.
r.Inflate(2, 2);
// Highlighting frame is drawn with black colour.
// Highlighting frame is removed by drawing using dialog background colour.
wxPen pen(draw ? *wxBLACK_PEN : wxPen(wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE)));
dc.SetPen(pen);
dc.SetBrush(*wxTRANSPARENT_BRUSH);
dc.DrawRectangle(r);
}
void wxGenericColourDialog::PaintCustomColour(wxDC& dc)
{
#if wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
wxUnusedVar(dc);
wxBitmap bmp(m_singleCustomColourRect.GetSize(), 32);
bmp.UseAlpha();
DoPreviewBitmap(bmp, m_colourData.GetColour());
m_customColourBmp->SetBitmap(bmp);
#else
dc.SetPen(*wxBLACK_PEN);
wxBrush *brush = new wxBrush(m_colourData.GetColour());
dc.SetBrush(*brush);
dc.DrawRectangle(m_singleCustomColourRect);
dc.SetBrush(wxNullBrush);
delete brush;
#endif // wxCLRDLGG_USE_PREVIEW_WITH_ALPHA/!wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
}
void wxGenericColourDialog::OnBasicColourClick(int which)
{
wxClientDC dc(this);
PaintHighlight(dc, false);
m_whichKind = 1;
m_colourSelection = which;
#if wxUSE_SLIDER
m_redSlider->SetValue( m_standardColours[m_colourSelection].Red() );
m_greenSlider->SetValue( m_standardColours[m_colourSelection].Green() );
m_blueSlider->SetValue( m_standardColours[m_colourSelection].Blue() );
if ( m_colourData.GetChooseAlpha() )
{
m_alphaSlider->SetValue( m_standardColours[m_colourSelection].Alpha() );
}
#endif // wxUSE_SLIDER
m_colourData.SetColour(m_standardColours[m_colourSelection]);
PaintCustomColour(dc);
PaintHighlight(dc, true);
}
void wxGenericColourDialog::OnCustomColourClick(int which)
{
wxClientDC dc(this);
PaintHighlight(dc, false);
m_whichKind = 2;
m_colourSelection = which;
#if wxUSE_SLIDER
m_redSlider->SetValue( m_customColours[m_colourSelection].Red() );
m_greenSlider->SetValue( m_customColours[m_colourSelection].Green() );
m_blueSlider->SetValue( m_customColours[m_colourSelection].Blue() );
if ( m_colourData.GetChooseAlpha() )
{
m_alphaSlider->SetValue( m_customColours[m_colourSelection].Alpha() );
}
#endif // wxUSE_SLIDER
m_colourData.SetColour(m_customColours[m_colourSelection]);
PaintCustomColour(dc);
PaintHighlight(dc, true);
}
/*
void wxGenericColourDialog::OnOk(void)
{
Show(false);
}
void wxGenericColourDialog::OnCancel(void)
{
colourDialogCancelled = true;
Show(false);
}
*/
void wxGenericColourDialog::OnAddCustom(wxCommandEvent& WXUNUSED(event))
{
wxClientDC dc(this);
if (m_whichKind != 2)
{
PaintHighlight(dc, false);
m_whichKind = 2;
m_colourSelection = 0;
PaintHighlight(dc, true);
}
m_customColours[m_colourSelection] = m_colourData.GetColour();
m_colourData.SetCustomColour(m_colourSelection, m_customColours[m_colourSelection]);
#if wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
wxBitmap bmp(m_smallRectangleSize, 32);
bmp.UseAlpha();
DoPreviewBitmap(bmp, m_customColours[m_colourSelection]);
m_customColoursBmp[m_colourSelection]->SetBitmap(bmp);
#else
PaintCustomColours(dc, m_colourSelection);
#endif // wxCLRDLGG_USE_PREVIEW_WITH_ALPHA/!wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
}
#if wxUSE_SLIDER
void wxGenericColourDialog::OnRedSlider(wxCommandEvent& WXUNUSED(event))
{
if (!m_redSlider)
return;
wxClientDC dc(this);
wxColour c = m_colourData.GetColour();
m_colourData.SetColour(wxColour((unsigned char)m_redSlider->GetValue(), c.Green(), c.Blue(), c.Alpha()));
PaintCustomColour(dc);
}
void wxGenericColourDialog::OnGreenSlider(wxCommandEvent& WXUNUSED(event))
{
if (!m_greenSlider)
return;
wxClientDC dc(this);
wxColour c = m_colourData.GetColour();
m_colourData.SetColour(wxColour(c.Red(), (unsigned char)m_greenSlider->GetValue(), c.Blue(), c.Alpha()));
PaintCustomColour(dc);
}
void wxGenericColourDialog::OnBlueSlider(wxCommandEvent& WXUNUSED(event))
{
if (!m_blueSlider)
return;
wxClientDC dc(this);
wxColour c = m_colourData.GetColour();
m_colourData.SetColour(wxColour(c.Red(), c.Green(), (unsigned char)m_blueSlider->GetValue(), c.Alpha()));
PaintCustomColour(dc);
}
void wxGenericColourDialog::OnAlphaSlider(wxCommandEvent& WXUNUSED(event))
{
wxColour c = m_colourData.GetColour();
m_colourData.SetColour(wxColour(c.Red(), c.Green(), c.Blue(), (unsigned char)m_alphaSlider->GetValue()));
wxClientDC dc(this);
PaintCustomColour(dc);
}
#endif // wxUSE_SLIDER
#if wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
void wxGenericColourDialog::DoPreviewBitmap(wxBitmap& bmp, const wxColour& colour)
{
if ( bmp.HasAlpha() && colour.Alpha() != wxALPHA_OPAQUE )
{
// For real ARGB draw a chessboard grid
// with actual ARGB fields and reference RGB fields.
const int w = bmp.GetWidth();
const int h = bmp.GetHeight();
// Calculate field size: 4 fields per row/column,
// with size in range [2..10]
int dx = wxMax(wxMin(w / 4, 10), 2);
int dy = wxMax(wxMin(h / 4, 10), 2);
// We want a square field
dx = wxMax(dx, dy);
dy = dx;
// Prepare opaque colour
wxColour colourRGB(colour.Red(), colour.Green(), colour.Blue(), wxALPHA_OPAQUE);
{
wxBrush brushARGB(colour);
wxBrush brushRGB(colourRGB);
wxMemoryDC mdc(bmp);
{
wxGCDC gdc(mdc);
gdc.SetPen(*wxTRANSPARENT_PEN);
for (int x = 0, ix = 0; x < w; x += dx, ix++)
{
for (int y = 0, iy = 0; y < h; y += dy, iy++)
{
if ( (ix+iy) % 2 == 0 )
{
gdc.SetBrush(brushARGB);
}
else
{
gdc.SetBrush(brushRGB);
}
gdc.DrawRectangle(x, y, dx, dy);
}
}
// Draw a frame
gdc.SetPen(*wxBLACK_PEN);
gdc.SetBrush(*wxTRANSPARENT_BRUSH);
gdc.DrawRectangle(0, 0, w, h);
}
}
}
else
{
wxMemoryDC mdc(bmp);
// Fill with custom colour
wxBrush brush(colour);
mdc.SetPen(*wxBLACK_PEN);
mdc.SetBrush(brush);
mdc.DrawRectangle(wxPoint(0, 0), bmp.GetSize());
}
}
#endif // wxCLRDLGG_USE_PREVIEW_WITH_ALPHA
#endif // wxUSE_COLOURDLG