aslider.cpp

Audacity是一款用於錄音和編輯聲音的、免費的開放源碼軟體。它可以執行於Mac OS X、Microsoft Windows、GNU/Linux和其它作業系統

/**********************************************************************

  Audacity: A Digital Audio Editor

  ASlider.cpp

  Dominic Mazzoni

  This class is a custom slider, allowing for a 
  slicker look and feel by allowing you to use images
  for the slider background and the thumb.

**********************************************************************/

#include <math.h>

#include <wx/defs.h>
#include <wx/dcclient.h>
#include <wx/dcmemory.h>
#include <wx/image.h>
#include <wx/msgdlg.h>
#include <wx/panel.h>
#include <wx/tooltip.h>
#include <wx/debug.h>
#include <wx/textctrl.h>
#include <wx/valtext.h>
#include <wx/dialog.h>
#include <wx/sizer.h>
#include <wx/button.h>
#include <wx/statline.h>
#include <wx/sizer.h>


#if defined(__WXMSW__) && !defined(__CYGWIN__)
#define USE_POPUPWIN 1
#endif

#if USE_POPUPWIN
#include <wx/popupwin.h>
#endif

#include "ASlider.h"


#include "../AColor.h"
#include "../ImageManipulation.h"
#include "../Project.h"

#include "../../images/SliderThumb.xpm"

#include <iostream>

#if defined __WXMSW__
const int sliderFontSize = 10;
#else
const int sliderFontSize = 12;
#endif

//
// TipPanel
//

#if USE_POPUPWIN
class TipPanel : public wxPopupWindow
#else
class TipPanel : public wxPanel
#endif
{
 public:
   TipPanel(wxWindow * parent, wxWindowID id,
            wxString label,
            const wxPoint &pos);
   
   void SetPos(const wxPoint &pos);

   void OnPaint(wxPaintEvent & event);

   wxString label;
   wxString origLabel;

   wxWindow *mParent;

   DECLARE_EVENT_TABLE()
};

#if USE_POPUPWIN

BEGIN_EVENT_TABLE(TipPanel, wxPopupWindow)
   EVT_PAINT(TipPanel::OnPaint)
END_EVENT_TABLE()

TipPanel::TipPanel(wxWindow *parent, wxWindowID id,
                   wxString label, const wxPoint &pos):
   wxPopupWindow(parent)
{
   this->label = label;
   this->origLabel = label;
   mParent = parent;
   SetPos(pos);
}

void TipPanel::SetPos(const wxPoint& pos)
{
   int x = pos.x;
   int y = pos.y;

   if (mParent)
      mParent->ClientToScreen(&x,&y);

   wxClientDC dc(this);
   wxFont labelFont(sliderFontSize, wxSWISS, wxNORMAL, wxNORMAL);
   dc.SetFont(labelFont);
   int width, height;
   dc.GetTextExtent(origLabel, &width, &height);
   height += 4;
   SetSize(x - width/2, y, width, height);
}

#else

BEGIN_EVENT_TABLE(TipPanel, wxPanel)
   EVT_PAINT(TipPanel::OnPaint)
END_EVENT_TABLE()

TipPanel::TipPanel(wxWindow *parent, wxWindowID id,
                   wxString label,
                   const wxPoint &pos):
   wxPanel(parent, id)
{
   this->label = label;
   this->origLabel = label;
   SetPos(pos);
}

void TipPanel::SetPos(const wxPoint& pos)
{
   wxClientDC dc(this);
   wxFont labelFont(sliderFontSize, wxSWISS, wxNORMAL, wxNORMAL);
   dc.SetFont(labelFont);
   int width, height;
   dc.GetTextExtent(origLabel, &width, &height);
   width += 4;
   height += 4;
   int left = pos.x - width/2;
   if (left < 0)
      left = 0;
   SetSize(left, pos.y, width, height);   
}

#endif

void TipPanel::OnPaint(wxPaintEvent& event)
{
   wxPaintDC dc(this);
   int width, height, textWidth, textHeight;

   wxFont labelFont(sliderFontSize, wxSWISS, wxNORMAL, wxNORMAL);
   dc.SetFont(labelFont);
   GetClientSize(&width, &height);
   dc.SetPen(*wxBLACK_PEN);
   dc.SetBrush(AColor::tooltipBrush);
   dc.DrawRectangle(0, 0, width, height);
   dc.GetTextExtent(label, &textWidth, &textHeight);
   dc.DrawText(label, (width-textWidth)/2, (height-textHeight)/2);
}




///
///SliderDialog
///
#define ID_SLIDER 10000
BEGIN_EVENT_TABLE(SliderDialog, wxDialog)
   EVT_COMMAND(ID_SLIDER,wxEVT_COMMAND_SLIDER_UPDATED,SliderDialog::OnSlider)
   EVT_TEXT_ENTER(SLIDER_DIALOG_TEXTCTRL,SliderDialog::OnEnter)
   EVT_TEXT(SLIDER_DIALOG_TEXTCTRL,SliderDialog::OnKeyEvent)
END_EVENT_TABLE()
   ;

SliderDialog::SliderDialog(wxWindow * parent, wxWindowID id,
                           const wxString & title, 
                           wxPoint position,
                           wxSize size,
                           int style, 
                           float value):
   wxDialog(NULL,id,title,position)
{
   wxBeginBusyCursor();

   //Use a vertical sizer
   wxBoxSizer * vs = new wxBoxSizer(wxVERTICAL);
   
   //Add the text
   wxString * dummy = new wxString(wxString::Format(wxT("%2.2f"),value));
   mTextCtrl = new wxTextCtrl(this,SLIDER_DIALOG_TEXTCTRL,*dummy,
                              wxDefaultPosition,
                              wxDefaultSize,
                              wxTE_PROCESS_ENTER, 
                              wxTextValidator(wxFILTER_NUMERIC,dummy));
   vs->Add(mTextCtrl,0,wxEXPAND|wxALL,5);

   //Add a slider 
   mSlider = new ASlider(this,ID_SLIDER,title,wxDefaultPosition,size,style);
   vs->Add(mSlider,wxEXPAND|wxLEFT|wxRIGHT, 5 );
   
   //Create buttons 
   vs->Add(CreateStdDialogButtonSizer(wxOK|wxCANCEL),0,wxEXPAND|wxALL,5);
      
   //lay it out
   SetAutoLayout(true);
   SetSizer(vs);
   vs->SetSizeHints(this);
   vs->Fit(this);

   mTextCtrl->SetSelection(-1,-1);
   mTextCtrl->SetFocus();
   mSlider->Set(value);

   wxEndBusyCursor();
}

SliderDialog::~SliderDialog()
{
   delete mSlider;
   delete mTextCtrl;
}


void SliderDialog::OnSlider(wxCommandEvent & event)
{
   mTextCtrl->SetValue(wxString::Format(wxT("%2.2f"),mSlider->Get()));

   event.Skip(false);
}


void SliderDialog::OnKeyEvent(wxCommandEvent & event)
{
   //Do not do anything here right now.  Possibly, better rounding
   //and validation could go here.
}


void SliderDialog::OnEnter(wxCommandEvent & event)
{
   wxString text = mTextCtrl->GetValue();
   //Convert to a double
   double val=0;
   text.ToDouble(&val);

   //Set the slider to the value.
   mSlider->Set(val);

   //Set the text value to the slider's
   mTextCtrl->SetValue(wxString::Format(wxT("%2.2f"),mSlider->Get()));

   OnOK(event);
}


float SliderDialog:: Get()
{
   return mSlider->Get();
}


//
// LWSlider
//

// Construct customizable slider
LWSlider::LWSlider(wxWindow * parent,
         wxString name,
         const wxPoint &pos,
         const wxSize &size,
         float minValue,
         float maxValue,
         float stepValue,
         bool canUseShift,
         int style,
         bool heavyweight /* = false */
         )
{
   Init(parent, name, pos, size, minValue, maxValue,
      stepValue, canUseShift, style, heavyweight);
}

// Construct predefined slider
LWSlider::LWSlider(wxWindow *parent,
                   wxString name,
                   const wxPoint &pos,
                   const wxSize &size,
                   int style,
                   bool heavyweight /* = false */)
{
   wxString leftLabel, rightLabel;
   float minValue, maxValue, stepValue;

   switch(style)
   {
   case PAN_SLIDER:
      minValue = -1.0f;
      maxValue = +1.0f;
      stepValue = 0.1f;
      break;
   case DB_SLIDER:
      minValue = -36.0f;
      maxValue = 36.0f;
      stepValue = 3.0f;
      break;
   case FRAC_SLIDER:
      minValue = 0.0f;
      maxValue = 1.0f;
      stepValue = STEP_CONTINUOUS;
      break;
   case SPEED_SLIDER:
      minValue = 0.0f;
      maxValue = 3.0f;
      stepValue = STEP_CONTINUOUS;
      break;

   default:
      minValue = 0.0f;
      maxValue = 1.0f;
      stepValue = 0.0f;
      wxASSERT(false); // undefined style
   }

   Init(parent, name, pos, size, minValue, maxValue, stepValue,
        true, style, heavyweight);
}

void LWSlider::Init(wxWindow * parent,
     wxString name,
     const wxPoint &pos,
     const wxSize &size,
     float minValue,
     float maxValue,
     float stepValue,
     bool canUseShift,
     int style,
     bool heavyweight /* = false */
     )
{
   mName = name;
   mStyle = style;
   mIsDragging = false;
   mWidth = size.x;
   mHeight = size.y;
   mParent = parent;
   mHW = heavyweight;
   mID = -1;
   mMinValue = minValue;
   mMaxValue = maxValue;
   mStepValue = stepValue;
   mCanUseShift = canUseShift;
   mCurrentValue = 0.0f;

   if (!(mWidth & 0))
      mWidth--;

   mCenterY = mHeight - 9;

   wxMemoryDC *dc = new wxMemoryDC();
   wxBitmap *bitmap = new wxBitmap(8, 8);
   dc->SelectObject(*bitmap);

   AColor::Medium(dc, false);
   wxColour bkgnd = dc->GetPen().GetColour();
   AColor::Medium(dc, true);   
   wxColour selBkgnd = dc->GetPen().GetColour();

   wxImage *backgroundImage =
      CreateSysBackground(mWidth, mHeight, 0, bkgnd);
#if wxCHECK_VERSION(2, 5, 0)
   wxBitmap backgroundBitmap(backgroundImage);
#else
   wxBitmap backgroundBitmap =
      backgroundImage->ConvertToBitmap();
#endif
   wxImage *thumbImage = new wxImage(wxBitmap(SliderThumb).ConvertToImage());
   wxImage *thumb1 = ChangeImageColour(thumbImage, bkgnd);
   wxImage *thumb2 = ChangeImageColour(thumbImage, selBkgnd);
   mThumbBitmap = new wxBitmap(thumb1);
   mSelThumbBitmap = new wxBitmap(thumb2);
   delete thumb1;
   delete thumb2;
   delete thumbImage;

   delete dc;
   delete bitmap;

   mThumbWidth = mThumbBitmap->GetWidth();
   mThumbHeight = mThumbBitmap->GetHeight();

   mLeftX = mThumbWidth/2;
   mRightX = mWidth - mThumbWidth/2 - 1;
   mWidthX = mRightX - mLeftX;

   int i;
   for(i=0; i<2; i++) {
      wxBitmap *bitmap;

      bitmap = new wxBitmap(mWidth, mHeight);
      wxMemoryDC *dc = new wxMemoryDC();
      dc->SelectObject(*bitmap);

      if (mHW) {
         dc->DrawBitmap(backgroundBitmap, 0, 0);
      }
      else {
         AColor::Medium(dc, i==1);
         dc->DrawRectangle(0, 0, mWidth, mHeight);
      }

      AColor::Medium(dc, i==1);
      dc->DrawLine(mLeftX, mCenterY, mRightX+2, mCenterY);
      AColor::Dark(dc, false);
      dc->DrawLine(mLeftX, mCenterY+1, mRightX+2, mCenterY+1);

      int divs = 10;
      double upp = divs / (double)(mWidthX-1);
      double d = 0;
      int int_d = -1;
      for(int p=0; p<=mWidthX; p++) {
         if (((int)d) > int_d) {
            int_d = (int)d;
            int ht = (int_d==0 || int_d==divs? 5: 3);
            AColor::Light(dc, false);
            dc->DrawLine(mLeftX+p, mCenterY-ht, mLeftX+p, mCenterY);
            AColor::Dark(dc, false);
            dc->DrawLine(mLeftX+p+1, mCenterY-ht+1, mLeftX+p+1, mCenterY);
         }
         d += upp;
      }

      if (style == PAN_SLIDER)
      {
         wxFont labelFont(sliderFontSize, wxSWISS, wxNORMAL, wxNORMAL);
         dc->SetFont(labelFont);

         /* i18n-hint: One-letter abbreviation for Left, in the Pan slider */
         dc->DrawText(_("L"), mLeftX, 1);

         /* i18n-hint: One-letter abbreviation for Right, in the Pan slider */