Initial release

engine/vendor/vst3sdk/vstgui4/vstgui/lib/controls/cvumeter.cpp

@@ -0,0 +1,155 @@
+// This file is part of VSTGUI. It is subject to the license terms 
+// in the LICENSE file found in the top-level directory of this
+// distribution and at http://github.com/steinbergmedia/vstgui/LICENSE
+
+#include "cvumeter.h"
+#include "../coffscreencontext.h"
+#include "../cbitmap.h"
+#include "../cvstguitimer.h"
+#include <list>
+
+namespace VSTGUI {
+
+//------------------------------------------------------------------------
+// CVuMeter
+//------------------------------------------------------------------------
+/**
+ * CVuMeter constructor.
+ * @param size the size of this view
+ * @param onBitmap TODO
+ * @param offBitmap TODO
+ * @param nbLed TODO
+ * @param style kHorizontal or kVertical
+ */
+//------------------------------------------------------------------------
+CVuMeter::CVuMeter (const CRect& size, CBitmap* onBitmap, CBitmap* offBitmap, int32_t nbLed,
+					Style style)
+: CControl (size, nullptr, 0), offBitmap (nullptr), nbLed (nbLed), style (style)
+{
+	setDecreaseStepValue (0.1f);
+
+	setOnBitmap (onBitmap);
+	setOffBitmap (offBitmap);
+
+	rectOn  (size.left, size.top, size.right, size.bottom);
+	rectOff (size.left, size.top, size.right, size.bottom);
+
+	setWantsIdle (true);
+}
+
+//------------------------------------------------------------------------
+CVuMeter::CVuMeter (const CVuMeter& v)
+: CControl (v)
+, offBitmap (nullptr)
+, nbLed (v.nbLed)
+, style (v.style)
+, decreaseValue (v.decreaseValue)
+, rectOn (v.rectOn)
+, rectOff (v.rectOff)
+{
+	setOffBitmap (v.offBitmap);
+	setWantsIdle (true);
+}
+
+//------------------------------------------------------------------------
+CVuMeter::~CVuMeter () noexcept
+{
+	setOnBitmap (nullptr);
+	setOffBitmap (nullptr);
+}
+
+//------------------------------------------------------------------------
+void CVuMeter::setViewSize (const CRect& newSize, bool invalid)
+{
+	CControl::setViewSize (newSize, invalid);
+	rectOn  = getViewSize ();
+	rectOff = getViewSize ();
+}
+
+//------------------------------------------------------------------------
+bool CVuMeter::sizeToFit ()
+{
+	if (getDrawBackground ())
+	{
+		CRect vs (getViewSize ());
+		vs.setWidth (getDrawBackground ()->getWidth ());
+		vs.setHeight (getDrawBackground ()->getHeight ());
+		setViewSize (vs);
+		setMouseableArea (vs);
+		return true;
+	}
+	return false;
+}
+
+//-----------------------------------------------------------------------------
+void CVuMeter::setOffBitmap (CBitmap* bitmap)
+{
+	if (offBitmap)
+		offBitmap->forget ();
+	offBitmap = bitmap;
+	if (offBitmap)
+		offBitmap->remember ();
+}
+
+//------------------------------------------------------------------------
+void CVuMeter::setDirty (bool state)
+{
+	CView::setDirty (state);
+}
+
+//------------------------------------------------------------------------
+void CVuMeter::onIdle ()
+{
+	if (getOldValue () != value)
+		invalid ();
+}
+
+//------------------------------------------------------------------------
+void CVuMeter::draw (CDrawContext *_pContext)
+{
+	if (!getOnBitmap ())
+		return;
+
+	CRect _rectOn (rectOn);
+	CRect _rectOff (rectOff);
+	CPoint pointOn;
+	CPoint pointOff;
+	CDrawContext *pContext = _pContext;
+
+	bounceValue ();
+	
+	float newValue = getOldValue () - decreaseValue;
+	if (newValue < value)
+		newValue = value;
+	setOldValue (newValue);
+
+	newValue = (newValue - getMin ()) / getRange (); // normalize
+
+	if (style == Style::kHorizontal)
+	{
+		auto tmp = (CCoord)(((int32_t)(nbLed * newValue + 0.5f) / (float)nbLed) * getOnBitmap ()->getWidth ());
+		pointOff (tmp, 0);
+
+		_rectOff.left += tmp;
+		_rectOn.right = tmp + rectOn.left;
+	}
+	else 
+	{
+		auto tmp = (CCoord)(((int32_t)(nbLed * (1.f - newValue) + 0.5f) / (float)nbLed) * getOnBitmap ()->getHeight ());
+		pointOn (0, tmp);
+
+		_rectOff.bottom = tmp + rectOff.top;
+		_rectOn.top     += tmp;
+	}
+
+	if (getOffBitmap ())
+	{
+		getOffBitmap ()->draw (pContext, _rectOff, pointOff);
+	}
+
+	getOnBitmap ()->draw (pContext, _rectOn, pointOn);
+
+	setDirty (false);
+}
+
+} // VSTGUI