fixes #132: non-GUI triggered parameter changes now update the GUI control label

[dreddi]

Fixes #132

Solution:

We patch Virus::Controller::sendParameterChange to update the GUI control label on every parameter change.

This is achieved by implementing a new VirusEditor::updateControlLabel that takes a pluginLib::Parameter as an argument, and updates the control label using its fields. We refactor the existing code to ensure that FocusedParameterTooltip behaviour continues as before.

Examples:

1. In single mode, updating 'Portamento Time' via midi controller or DAW plugin wrapper will display 'Portamento Time' in the control label.
2. In multi mode, you get the same behaviour, but also
3. if channel 5 is the currently active part, updating channel 2's 'Portamento Time' will display 'Ch 2 Portamento Time' rather than 'Portamento Time', to reduce ambiguity.

Other changes:

1. source/juceUiLib/tabgroup.h: We introduce a unique ID for each juce::Component during template <typename T> T* UiObject::createJuceObject(Editor& _editor, T* _object) , so that we can match on this key by calling component.getComponentID(), for example. We use this when checking whether a component exists on a particular page (for FocusedParameterTooltip).

Possible improvements:

• ~Investigate any performance implications, of walking the m_bindings vector linearly, on every single parameter change.~ This code has been made redundant.
• A small number of parameters will not trigger a message in the 'control label' (Ch1 Channel Volume, Ch1 Balance, possibly others). This occurs when the skin does not implement controls for these parameters. We could choose to implement labels for these parameters in a fall back capacity (by referencing the labels given in parameterDescriptions_C.json.
  • These parameters can always be reached from a DAWs plugin wrapper UI, or through a DAWs automation panel, and so a missing control label for them may be noticed, but irrelevant to the user's workflow.

[dreddi]

Bug: control label only updates correctly for the channel selected in the GUI (Ch1 in single mode, the selected channel in multi mode). Control label gets stuck when a different channel's value is changed. Will fix.

[dreddi]

Bugs fixed, ready to merge. Original post has been updated.

[dreddi]

Ran clang-format on the lines of code I touched, using source/.clang-format as a ruleset

[dsp56300]

thanks for the suggestion, I added it meanwhile