LV2EffectMeter Class Reference

UI widget that watches a floating point location and then updates a bar. More...

#include <LV2EffectMeter.h>

Inheritance diagram for LV2EffectMeter:

Collaboration diagram for LV2EffectMeter:

Public Member Functions
	LV2EffectMeter (wxWindow *parent, const LV2ControlPortPtr ctrl, const float &value)
virtual	~LV2EffectMeter ()
void	Disconnect ()

Private Member Functions
void	OnErase (wxEraseEvent &evt)
void	OnPaint (wxPaintEvent &evt)
void	OnIdle (wxIdleEvent &evt)
void	OnSize (wxSizeEvent &evt)

Private Attributes
bool	mConnected { true }
const LV2ControlPortPtr	mControlPort
const float &	mValue
float	mLastValue

Detailed Description

UI widget that watches a floating point location and then updates a bar.

Definition at line 22 of file LV2EffectMeter.h.

Constructor & Destructor Documentation

LV2EffectMeter()

LV2EffectMeter::LV2EffectMeter	(	wxWindow *	parent,
		const LV2ControlPortPtr	ctrl,
		const float &	value
	)

Definition at line 34 of file LV2EffectMeter.cpp.

   : wxWindow{ parent, wxID_ANY, wxDefaultPosition, wxDefaultSize,
      wxSIMPLE_BORDER }
   , mControlPort(port)
   , mValue{ value }
{
   mLastValue = -value;
   SetBackgroundColour(*wxWHITE);
   SetMinSize({ 20, 20 });
}

~LV2EffectMeter()

LV2EffectMeter::~LV2EffectMeter ( )

virtual

Definition at line 46 of file LV2EffectMeter.cpp.

{
}

Member Function Documentation

Disconnect()

void LV2EffectMeter::Disconnect ( )

inline

Definition at line 28 of file LV2EffectMeter.h.

   {
      // Stop using mValue, it may be dangling
      mConnected = false;
   }

References mConnected.

OnErase()

void LV2EffectMeter::OnErase ( wxEraseEvent &  evt )

private

Definition at line 59 of file LV2EffectMeter.cpp.

{
   // Just ignore it to prevent flashing
}

OnIdle()

void LV2EffectMeter::OnIdle ( wxIdleEvent &  evt )

private

Definition at line 50 of file LV2EffectMeter.cpp.

{
   evt.Skip();
   if (!mConnected)
      return;
   if (mLastValue != mValue)
      Refresh(false);
}

References mConnected, mLastValue, and mValue.

OnPaint()

void LV2EffectMeter::OnPaint ( wxPaintEvent &  evt )

private

Definition at line 64 of file LV2EffectMeter.cpp.

{
   if (!mConnected)
      return;
 
   std::unique_ptr<wxDC> dc {wxAutoBufferedPaintDCFactory(this)};
 
   // Cache some metrics
   wxRect r = GetClientRect();
   wxCoord x = r.GetLeft();
   wxCoord y = r.GetTop();
   wxCoord w = r.GetWidth();
   wxCoord h = r.GetHeight();
 
   // These use unscaled value, min, and max
   float val = std::clamp(mValue, mControlPort->mMin, mControlPort->mMax)
      - mControlPort->mMin;
 
   // Setup for erasing the background
   dc->SetPen(*wxTRANSPARENT_PEN);
   dc->SetBrush(wxColour(100, 100, 220));
 
   dc->Clear();
   dc->DrawRectangle(x, y, (w * (val / fabs(mControlPort->mMax - mControlPort->mMin))), h);
 
   mLastValue = mValue;
}

References mConnected, mControlPort, mLastValue, and mValue.

OnSize()

void LV2EffectMeter::OnSize ( wxSizeEvent &  evt )

private

Definition at line 92 of file LV2EffectMeter.cpp.

{
   Refresh(false);
}

Member Data Documentation

mConnected

bool LV2EffectMeter::mConnected { true }

private

Definition at line 41 of file LV2EffectMeter.h.

Referenced by Disconnect(), OnIdle(), and OnPaint().

mControlPort

const LV2ControlPortPtr LV2EffectMeter::mControlPort

private

Definition at line 42 of file LV2EffectMeter.h.

Referenced by OnPaint().

mLastValue

float LV2EffectMeter::mLastValue

private

Definition at line 44 of file LV2EffectMeter.h.

Referenced by OnIdle(), and OnPaint().

mValue

const float& LV2EffectMeter::mValue

private

Definition at line 43 of file LV2EffectMeter.h.

Referenced by OnIdle(), and OnPaint().

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The documentation for this class was generated from the following files:

• LV2EffectMeter.h
• LV2EffectMeter.cpp