void MidiKeyboardComponent::timerCallback()
{
if (shouldCheckState)
{
shouldCheckState = false;
for (int i = rangeStart; i <= rangeEnd; ++i)
{
if (keysCurrentlyDrawnDown[i] != state.isNoteOnForChannels (midiInChannelMask, i))
{
keysCurrentlyDrawnDown.setBit (i, state.isNoteOnForChannels (midiInChannelMask, i));
repaintNote (i);
}
}
}
if (shouldCheckMousePos)
{
Desktop& desktop = Desktop::getInstance();
for (int i = desktop.getNumMouseSources(); --i >= 0;)
{
MouseInputSource* source = desktop.getMouseSource (i);
jassert (source != nullptr);
updateNoteUnderMouse (getLocalPoint (nullptr, source->getScreenPosition()),
source->isDragging(), source->getIndex());
}
}
}
void DragAndDropContainer::startDragging (const var& sourceDescription,
Component* sourceComponent,
const Image& dragImage_,
const bool allowDraggingToExternalWindows,
const Point<int>* imageOffsetFromMouse)
{
Image dragImage (dragImage_);
if (dragImageComponent == nullptr)
{
Component* const thisComp = dynamic_cast <Component*> (this);
if (thisComp == nullptr)
{
jassertfalse; // Your DragAndDropContainer needs to be a Component!
return;
}
MouseInputSource* draggingSource = Desktop::getInstance().getDraggingMouseSource (0);
if (draggingSource == nullptr || ! draggingSource->isDragging())
{
jassertfalse; // You must call startDragging() from within a mouseDown or mouseDrag callback!
return;
}
const Point<int> lastMouseDown (Desktop::getLastMouseDownPosition());
Point<int> imageOffset;
if (dragImage.isNull())
{
dragImage = sourceComponent->createComponentSnapshot (sourceComponent->getLocalBounds())
.convertedToFormat (Image::ARGB);
dragImage.multiplyAllAlphas (0.6f);
const int lo = 150;
const int hi = 400;
Point<int> relPos (sourceComponent->getLocalPoint (nullptr, lastMouseDown));
Point<int> clipped (dragImage.getBounds().getConstrainedPoint (relPos));
for (int y = dragImage.getHeight(); --y >= 0;)
{
const double dy = (y - clipped.getY()) * (y - clipped.getY());
for (int x = dragImage.getWidth(); --x >= 0;)
{
const int dx = x - clipped.getX();
const int distance = roundToInt (std::sqrt (dx * dx + dy));
if (distance > lo)
{
const float alpha = (distance > hi) ? 0
: (hi - distance) / (float) (hi - lo)
+ Random::getSystemRandom().nextFloat() * 0.008f;
dragImage.multiplyAlphaAt (x, y, alpha);
}
}
}
imageOffset = -clipped;
}
else
{
if (imageOffsetFromMouse == nullptr)
imageOffset = -dragImage.getBounds().getCentre();
else
imageOffset = -(dragImage.getBounds().getConstrainedPoint (-*imageOffsetFromMouse));
}
dragImageComponent = new DragImageComponent (dragImage, sourceDescription, sourceComponent,
draggingSource->getComponentUnderMouse(), this, imageOffset);
currentDragDesc = sourceDescription;
if (allowDraggingToExternalWindows)
{
if (! Desktop::canUseSemiTransparentWindows())
dragImageComponent->setOpaque (true);
dragImageComponent->addToDesktop (ComponentPeer::windowIgnoresMouseClicks
| ComponentPeer::windowIsTemporary
| ComponentPeer::windowIgnoresKeyPresses);
}
else
thisComp->addChildComponent (dragImageComponent);
static_cast <DragImageComponent*> (static_cast <Component*> (dragImageComponent))->updateLocation (false, lastMouseDown);
dragImageComponent->setVisible (true);
#if JUCE_WINDOWS
// Under heavy load, the layered window's paint callback can often be lost by the OS,
// so forcing a repaint at least once makes sure that the window becomes visible..
ComponentPeer* const peer = dragImageComponent->getPeer();
if (peer != nullptr)
peer->performAnyPendingRepaintsNow();
#endif
}
}
