changespeed.cpp

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   pStaticText = new wxStaticText(this, -1, _("Percent Change:"),
												wxDefaultPosition, wxDefaultSize, 0);
   pBoxSizer_PercentChange->Add(pStaticText, 0, 
											wxALIGN_CENTER_VERTICAL | wxALIGN_RIGHT | wxALL, 4);

	//v Override wxTextValidator to disallow negative values <= -100.0?
   m_pTextCtrl_PercentChange = 
		new wxTextCtrl(this, ID_TEXT_PERCENTCHANGE, wxT("0.0"), 
							wxDefaultPosition, wxSize(40, -1), 0,
							wxTextValidator(wxFILTER_NUMERIC));
   pBoxSizer_PercentChange->Add(m_pTextCtrl_PercentChange, 0, 
											wxALIGN_CENTER_VERTICAL | wxALIGN_LEFT | wxALL, 4);

   pBoxSizer_Dialog->Add(pBoxSizer_PercentChange, 0, wxALIGN_CENTER | wxALL, 4);

   m_pSlider_PercentChange = 
		new wxSlider(this, ID_SLIDER_PERCENTCHANGE, 0, 
							PERCENTCHANGE_MIN, PERCENTCHANGE_MAX,
							wxDefaultPosition, wxSize(100, -1), wxSL_HORIZONTAL);
   pBoxSizer_Dialog->Add(m_pSlider_PercentChange, 1, 
									wxGROW | wxALIGN_CENTER | wxLEFT | wxRIGHT, 4);

   pBoxSizer_Dialog->Add(0, 8, 0); // spacer


	// from/to Vinyl controls
   wxBoxSizer * pBoxSizer_Vinyl = new wxBoxSizer(wxHORIZONTAL);

	const wxString strArray_VinylRPM[] = {wxT("33 1/3"), wxT("45"), wxT("78"),
                                         /* i18n-hint: n/a is an English
                                            abbreviation meaning "not
                                            applicable" (in other words,
                                            unimportant, not relevant). */
                                         _("n/a")};
	const int numChoices = 4;

   pStaticText = new wxStaticText(this, -1, _("Standard Vinyl RPM:   from"),
									       wxDefaultPosition, wxDefaultSize, 0);
   pBoxSizer_Vinyl->Add(pStaticText, 0, 
								wxALIGN_CENTER_VERTICAL | wxALIGN_RIGHT | wxALL, 4);

   m_pChoice_FromVinyl = 
		new wxChoice(this, ID_CHOICE_FROMVINYL, 
							wxDefaultPosition, wxSize(64, -1), numChoices, strArray_VinylRPM);
   pBoxSizer_Vinyl->Add(m_pChoice_FromVinyl, 0, wxALIGN_CENTER | wxALL, 4);

   pStaticText = new wxStaticText(this, -1, _("to"),
									       wxDefaultPosition, wxDefaultSize, 0);
   pBoxSizer_Vinyl->Add(pStaticText, 0, 
								wxALIGN_CENTER_VERTICAL | wxALIGN_RIGHT | wxALL, 4);

   m_pChoice_ToVinyl = 
		new wxChoice(this, ID_CHOICE_TOVINYL, 
							wxDefaultPosition, wxSize(64, -1), numChoices, strArray_VinylRPM);
   pBoxSizer_Vinyl->Add(m_pChoice_ToVinyl, 0, wxALIGN_CENTER | wxALL, 4);

   pBoxSizer_Dialog->Add(pBoxSizer_Vinyl, 0, wxALIGN_CENTER | wxALL, 4);


	// Preview, OK, & Cancel buttons
   pBoxSizer_Dialog->Add(0, 8, 0); // spacer

   wxBoxSizer * pBoxSizer_OK = new wxBoxSizer(wxHORIZONTAL);

   wxButton * pButton_Preview = 
		new wxButton(this, ID_BUTTON_PREVIEW, m_pEffect->GetPreviewName());
   pBoxSizer_OK->Add(pButton_Preview, 0, wxALIGN_CENTER | wxALL, 4);
   pBoxSizer_OK->Add(32, 8); // horizontal spacer

   wxButton * pButton_Cancel =
       new wxButton(this, wxID_CANCEL, _("Cancel"), wxDefaultPosition, wxDefaultSize, 0);
   pBoxSizer_OK->Add(pButton_Cancel, 0, wxALIGN_CENTER | wxALL, 4);

   wxButton * pButton_OK =
       new wxButton(this, wxID_OK, _("OK"), wxDefaultPosition, wxDefaultSize, 0);
   pButton_OK->SetDefault();
   pButton_OK->SetFocus();
   pBoxSizer_OK->Add(pButton_OK, 0, wxALIGN_CENTER | wxALL, 4);

   pBoxSizer_Dialog->Add(pBoxSizer_OK, 0, wxALIGN_CENTER | wxALL, 8);


   this->SetAutoLayout(true);
   this->SetSizer(pBoxSizer_Dialog);
   pBoxSizer_Dialog->Fit(this);
   pBoxSizer_Dialog->SetSizeHints(this);
}

bool ChangeSpeedDialog::Validate()
{
   return true; 
}

bool ChangeSpeedDialog::TransferDataToWindow()
{
   m_bLoopDetect = true;

	// percent change controls
	this->Update_Text_PercentChange();
	this->Update_Slider_PercentChange();

	// from/to Vinyl controls
	if (m_pChoice_FromVinyl) 
		m_pChoice_FromVinyl->SetSelection(m_FromVinyl);

	if (m_pChoice_ToVinyl) 
		m_pChoice_ToVinyl->SetSelection(m_ToVinyl);

	m_bLoopDetect = false;

	return true;
}

bool ChangeSpeedDialog::TransferDataFromWindow()
{
	wxString str;

	// percent change controls
   if (m_pTextCtrl_PercentChange) {
      double newValue = 0;
      str = m_pTextCtrl_PercentChange->GetValue();
      str.ToDouble(&newValue);
		m_PercentChange = newValue;
	}

	// Ignore Slider_PercentChange because TextCtrl_PercentChange 
	// always tracks it & is more precise (decimal points).


	// from/to Vinyl controls
	if (m_pChoice_FromVinyl) 
		m_FromVinyl = m_pChoice_FromVinyl->GetSelection();

	if (m_pChoice_ToVinyl) 
		m_ToVinyl = m_pChoice_ToVinyl->GetSelection();

   return true;
}

// handler implementations for ChangeSpeedDialog

void ChangeSpeedDialog::OnText_PercentChange(wxCommandEvent & event)
{
   if (m_bLoopDetect)
      return;

   if (m_pTextCtrl_PercentChange) {
      double newValue = 0;
      wxString str = m_pTextCtrl_PercentChange->GetValue();
      str.ToDouble(&newValue);
		m_PercentChange = newValue;

      m_bLoopDetect = true;
		this->Update_Slider_PercentChange();
		this->Update_Vinyl();
      m_bLoopDetect = false;

      FindWindow(wxID_OK)->Enable(m_PercentChange > -100.0);
   }
}

void ChangeSpeedDialog::OnSlider_PercentChange(wxCommandEvent & event)
{
   if (m_bLoopDetect)
      return;

	if (m_pSlider_PercentChange) {
		m_PercentChange = (double)(m_pSlider_PercentChange->GetValue()); 
		// Warp positive values to actually go up faster & further than negatives.
		if (m_PercentChange > 0.0)
			m_PercentChange = pow(m_PercentChange, PERCENTCHANGE_SLIDER_WARP);

	   m_bLoopDetect = true;
		this->Update_Text_PercentChange();
		this->Update_Vinyl();
	   m_bLoopDetect = false;
	}
}

void ChangeSpeedDialog::OnChoice_FromVinyl(wxCommandEvent & event)
{
   if (m_bLoopDetect)
      return;

	if (m_pChoice_FromVinyl) {
		m_FromVinyl = m_pChoice_FromVinyl->GetSelection();

      m_bLoopDetect = true;
		this->Update_PercentChange();
      m_bLoopDetect = false;
   }
}

void ChangeSpeedDialog::OnChoice_ToVinyl(wxCommandEvent & event)
{
   if (m_bLoopDetect)
      return;

	if (m_pChoice_ToVinyl) {
		m_ToVinyl = m_pChoice_ToVinyl->GetSelection();

      m_bLoopDetect = true;
		this->Update_PercentChange();
      m_bLoopDetect = false;
   }
}


void ChangeSpeedDialog::OnPreview(wxCommandEvent &event)
{
   TransferDataFromWindow();

	// Save & restore parameters around Preview, because we didn't do OK.
	double oldPercentChange = m_pEffect->m_PercentChange;
   m_pEffect->m_PercentChange = m_PercentChange;
   m_pEffect->Preview();
   m_pEffect->m_PercentChange = oldPercentChange; 
}

void ChangeSpeedDialog::OnOk(wxCommandEvent & event)
{
   TransferDataFromWindow();
   
   if (Validate()) 
      EndModal(true);
   else 
      event.Skip();
}

void ChangeSpeedDialog::OnCancel(wxCommandEvent & event)
{
   EndModal(false);
}


// helper fns

void ChangeSpeedDialog::Update_Text_PercentChange()
{
	if (m_pTextCtrl_PercentChange) {
		wxString str;
		str.Printf(wxT("%.3f"), m_PercentChange);
		m_pTextCtrl_PercentChange->SetValue(str);
	}
}

void ChangeSpeedDialog::Update_Slider_PercentChange()
{
   if (m_pSlider_PercentChange) {
		double unwarped = m_PercentChange;
		if (unwarped > 0.0)
			// Un-warp values above zero to actually go up to PERCENTCHANGE_MAX.
			unwarped = pow(m_PercentChange, (1.0 / PERCENTCHANGE_SLIDER_WARP));
		
		// Add 0.5 to unwarped so trunc -> round.
		m_pSlider_PercentChange->SetValue((int)(unwarped + 0.5)); 
	}
}

void ChangeSpeedDialog::Update_Vinyl() 
// Update Vinyl controls for new percent change.
{
	if (m_pChoice_ToVinyl) 
		// Chances are so low that the slider will exactly match a 
		// standard ratio, just turn it "n/a" unless it's 0.0.
		if ((m_PercentChange == 0.0) && m_pChoice_FromVinyl)
			m_pChoice_ToVinyl->SetSelection(m_pChoice_FromVinyl->GetSelection());
		else
			m_pChoice_ToVinyl->SetSelection(CHOICE_NA);
}

void ChangeSpeedDialog::Update_PercentChange() 
// Update percent change controls for new Vinyl values.
{
	// If m_FromVinyl & m_ToVinyl are set, then there's a new percent change.
	if ((m_FromVinyl != CHOICE_NA) && (m_ToVinyl != CHOICE_NA)) {
		double fromRPM;
		double toRPM;
		switch (m_FromVinyl) {
      default:
		case CHOICE_33ANDATHIRD:	fromRPM = 33.0 + (1.0 / 3.0); break;
		case CHOICE_45:				fromRPM = 45.0; break;
		case CHOICE_78:				fromRPM = 78; break;
		}
		switch (m_ToVinyl) {
      default:
		case CHOICE_33ANDATHIRD:	toRPM = 33.0 + (1.0 / 3.0); break;
		case CHOICE_45:				toRPM = 45.0; break;
		case CHOICE_78:				toRPM = 78; break;
		}
		m_PercentChange = ((toRPM * 100.0) / fromRPM) - 100.0;

		this->Update_Text_PercentChange();
		this->Update_Slider_PercentChange();
	}
}

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