changetempo.cpp

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

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

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

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

	// from/to BPM controls
	wxString str;
	if (m_pTextCtrl_FromBPM) {
		if (m_FromBPM != 0)
			str.Printf(wxT("%d"), m_FromBPM);
		else
			str = wxT("");
		m_pTextCtrl_FromBPM->SetValue(str);
	}
	if (m_pTextCtrl_ToBPM) {
		if (m_ToBPM != 0)
			str.Printf(wxT("%d"), m_ToBPM);
		else
			str = wxT("");
		m_pTextCtrl_ToBPM->SetValue(str);
	}

	// from/to Length controls
	if (m_pTextCtrl_FromLength) {
		str.Printf(wxT("%.2f"), m_FromLength);
		m_pTextCtrl_FromLength->SetValue(str);
		m_pTextCtrl_FromLength->Enable(false); // Disable because the value comes from the user selection.
	}
	if (m_pTextCtrl_ToLength) {
		str.Printf(wxT("%.2f"), m_ToLength);
		m_pTextCtrl_ToLength->SetValue(str);
	}

   m_bLoopDetect = false;

	return true;
}

bool ChangeTempoDialog::TransferDataFromWindow()
{
	wxString str;

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

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

	// from/to BPM controls
   long newLong;
   if (m_pTextCtrl_FromBPM) {
      str = m_pTextCtrl_FromBPM->GetValue();
      str.ToLong(&newLong);
		m_FromBPM = (unsigned int)(newLong);
	}
   if (m_pTextCtrl_ToBPM) {
      str = m_pTextCtrl_ToBPM->GetValue();
      str.ToLong(&newLong);
		m_ToBPM = (unsigned int)(newLong);
	}

	// from/to Length controls
   // Don't do m_pTextCtrl_ToLength. It's disabled.
   if (m_pTextCtrl_ToLength) {
      str = m_pTextCtrl_ToLength->GetValue();
      str.ToLong(&newLong);
		m_ToLength = (int)(newLong);
	}

   return true;
}

// handler implementations for ChangeTempoDialog

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

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

      m_bLoopDetect = true;
		this->Update_Slider_PercentChange();
		this->Update_Text_ToBPM();
		this->Update_Text_ToLength();
      m_bLoopDetect = false;

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

void ChangeTempoDialog::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_Text_ToBPM();
		this->Update_Text_ToLength();
	   m_bLoopDetect = false;
	}
}

void ChangeTempoDialog::OnText_FromBPM(wxCommandEvent & event)
{
   if (m_bLoopDetect)
      return;

   if (m_pTextCtrl_FromBPM) {
      wxString str = m_pTextCtrl_FromBPM->GetValue();
      long newValue;
      str.ToLong(&newValue);
		m_FromBPM = (unsigned int)(newValue);

      m_bLoopDetect = true;

		this->Update_Text_ToBPM();

      m_bLoopDetect = false;
   }
}

void ChangeTempoDialog::OnText_ToBPM(wxCommandEvent & event)
{
   if (m_bLoopDetect)
      return;

   if (m_pTextCtrl_ToBPM) {
      wxString str = m_pTextCtrl_ToBPM->GetValue();
      long newValue;
      str.ToLong(&newValue);
		m_ToBPM = (unsigned int)(newValue);

      m_bLoopDetect = true;

		// If FromBPM has already been set, then there's a new percent change.
		if (m_FromBPM != 0) {
			m_PercentChange = (((double)(m_ToBPM) * 100.0) / (double)(m_FromBPM)) - 100.0;

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

			this->Update_Text_ToLength();
		}
      
      m_bLoopDetect = false;
   }
}

void ChangeTempoDialog::OnText_ToLength(wxCommandEvent & event)
{
   if (m_bLoopDetect)
      return;

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

		m_PercentChange = ((m_FromLength * 100.0) / m_ToLength) - 100.0;

      m_bLoopDetect = true;

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

		this->Update_Text_ToBPM();
      
      m_bLoopDetect = false;
   }
}


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

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


// helper fns

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

void ChangeTempoDialog::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 ChangeTempoDialog::Update_Text_ToBPM() 
// Use m_FromBPM & m_PercentChange to set new m_ToBPM & control.
{
   // Update ToBPM iff FromBPM has been set.
	if (m_FromBPM == 0) 
		return;

	m_ToBPM = (unsigned int)((((double)(m_FromBPM) * 
											(100.0 + m_PercentChange)) / 100.0) + 
										0.5); // Add 0.5 so trunc -> round.
	if (m_pTextCtrl_ToBPM) {
		wxString str;
		str.Printf(wxT("%d"), m_ToBPM);
		m_pTextCtrl_ToBPM->SetValue(str);
	}
}

void ChangeTempoDialog::Update_Text_ToLength() 
// Use m_FromLength & m_PercentChange to set new m_ToLength & control.
{
	m_ToLength = (m_FromLength * 100.0) / (100.0 + m_PercentChange);
	if (m_pTextCtrl_ToLength) {
		wxString str;
		str.Printf(wxT("%.2f"), m_ToLength);
		m_pTextCtrl_ToLength->SetValue(str);
	}
}

#endif // USE_SOUNDTOUCH

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