Setting plugin editor scale factor (and other plugin editor changes) (#…

…134)

* Implement guiSetScale in a JUCE correct way

guiSetScale calles editor->setScale
but then we need to use that editor scale transform to go
from logical units to physical units when representing
set/get size at the edges.

This works in Linux / Reaper at 200% on ubuntu.

* Not working in bitwig

* Scaling works for example plugin (no resizing)

* Example plugin works with resizing

* Little tweaks

* Move GUI resizing and transform logic to a wrapper component

* Fixing some mistakes on MacOS

* Fixing plugin editor not showing after closing and re-opening

* PR fixes

---------

Co-authored-by: baconpaul <[email protected]>

examples/GainPlugin/PluginEditor.cpp

@@ -56,6 +56,11 @@ PluginEditor::PluginEditor(GainPlugin &plug) : juce::AudioProcessorEditor(plug),
     plugin.getValueTreeState().addParameterListener(gainParameter->paramID, this);
 
     setSize(300, 300);
+    setResizable (true, true);
+
+    constrainer.setSizeLimits (200, 200, 500, 500);
+    constrainer.setFixedAspectRatio (1.0);
+    setConstrainer (&constrainer);
 }
 
 PluginEditor::~PluginEditor()

examples/GainPlugin/PluginEditor.h

@@ -21,5 +21,7 @@ class PluginEditor : public juce::AudioProcessorEditor,
     std::unique_ptr<juce::Slider> gainSlider;
     std::unique_ptr<juce::SliderParameterAttachment> sliderAttachment;
 
+    juce::ComponentBoundsConstrainer constrainer;
+
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(PluginEditor)
 };