Allow plugin UIs to be user-resizable, test with info example

dgl/Window.hpp

@@ -98,6 +98,8 @@ public:
     bool isResizable() const noexcept;
     void setResizable(bool yesNo);
 
+    void setGeometryConstraints(uint width, uint height, bool aspect);
+
     uint getWidth() const noexcept;
     uint getHeight() const noexcept;
     Size<uint> getSize() const noexcept;

dgl/src/Window.cpp

@@ -549,6 +549,15 @@ struct Window::PrivateData {
 
     // -------------------------------------------------------------------
 
+    void setGeometryConstraints(uint width, uint height, bool aspect)
+    {
+        DISTRHO_SAFE_ASSERT_RETURN(fResizable,);
+
+        puglUpdateGeometryConstraints(fView, width, height, aspect);
+    }
+
+    // -------------------------------------------------------------------
+
     void setSize(uint width, uint height, const bool forced = false)
     {
         if (width <= 1 || height <= 1)
@@ -1236,6 +1245,11 @@ void Window::setResizable(bool yesNo)
     pData->setResizable(yesNo);
 }
 
+void Window::setGeometryConstraints(uint width, uint height, bool aspect)
+{
+    pData->setGeometryConstraints(width, height, aspect);
+}
+
 uint Window::getWidth() const noexcept
 {
     return pData->fWidth;

distrho/DistrhoUI.hpp

@@ -54,13 +54,20 @@ public:
       UI class constructor.
       The UI should be initialized to a default state that matches the plugin side.
     */
-    UI(uint width = 0, uint height = 0);
+    UI(uint width = 0, uint height = 0, bool userResizable = false);
 
    /**
       Destructor.
     */
     virtual ~UI();
 
+   /**
+      Set geometry constraints for the UI when resized by the user.
+      This is a convenience function that calls getParentWindow().setGeometryConstraints()
+      @see Window::setGeometryConstraints(uint,uint,bool)
+    */
+    void setGeometryConstraints(uint minWidth, uint minHeight, bool keepAspectRatio);
+
    /* --------------------------------------------------------------------------------------------------------
     * Host state */
 

distrho/src/DistrhoUI.cpp

@@ -37,9 +37,9 @@ const char* g_nextBundlePath   = nullptr;
  * UI */
 
 #ifdef HAVE_DGL
-UI::UI(uint width, uint height)
+UI::UI(uint width, uint height, bool userResizable)
     : UIWidget(*d_lastUiWindow),
-      pData(new PrivateData())
+      pData(new PrivateData(userResizable))
 {
     ((UIWidget*)this)->pData->needsFullViewport = false;
 
@@ -47,9 +47,9 @@ UI::UI(uint width, uint height)
         setSize(width, height);
 }
 #else
-UI::UI(uint width, uint height)
+UI::UI(uint width, uint height, bool userResizable)
     : UIWidget(width, height),
-      pData(new PrivateData()) {}
+      pData(new PrivateData(userResizable)) {}
 #endif
 
 UI::~UI()
@@ -57,6 +57,11 @@ UI::~UI()
     delete pData;
 }
 
+void UI::setGeometryConstraints(uint minWidth, uint minHeight, bool keepAspectRatio)
+{
+    return getParentWindow().setGeometryConstraints(minWidth, minHeight, keepAspectRatio);
+}
+
 /* ------------------------------------------------------------------------------------------------------------
  * Host state */
 

distrho/src/DistrhoUIInternal.hpp

@@ -60,6 +60,9 @@ struct UI::PrivateData {
     void*    dspPtr;
 #endif
 
+    // UI
+    const bool userResizable;
+
     // Callbacks
     void*         callbacksPtr;
     editParamFunc editParamCallbackFunc;
@@ -68,12 +71,13 @@ struct UI::PrivateData {
     sendNoteFunc  sendNoteCallbackFunc;
     setSizeFunc   setSizeCallbackFunc;
 
-    PrivateData() noexcept
+    PrivateData(bool resizable) noexcept
         : sampleRate(d_lastUiSampleRate),
           parameterOffset(0),
 #if DISTRHO_PLUGIN_WANT_DIRECT_ACCESS
           dspPtr(d_lastUiDspPtr),
 #endif
+          userResizable(resizable),
           callbacksPtr(nullptr),
           editParamCallbackFunc(nullptr),
           setParamCallbackFunc(nullptr),
@@ -155,9 +159,9 @@ public:
           fIsReady(false)
     {
         DISTRHO_SAFE_ASSERT_RETURN(fUI != nullptr,);
+        DISTRHO_SAFE_ASSERT_RETURN(fUI->pData != nullptr,);
 
-        // set window size
-        setResizable(false);
+        setResizable(fUI->pData->userResizable);
         setSize(fUI->getWidth(), fUI->getHeight());
     }
 
@@ -182,6 +186,7 @@ protected:
     {
         DISTRHO_SAFE_ASSERT_RETURN(fUI != nullptr,);
 
+        fUI->setSize(width, height);
         fUI->uiReshape(width, height);
         fIsReady = true;
     }

examples/Info/InfoExampleUI.cpp

@@ -18,6 +18,8 @@
 
 #include "DistrhoUI.hpp"
 
+#include "Window.hpp"
+
 START_NAMESPACE_DISTRHO
 
 // -----------------------------------------------------------------------------------------------------------
@@ -26,13 +28,16 @@ class InfoExampleUI : public UI
 {
 public:
     InfoExampleUI()
-        : UI(405, 256)
+        : UI(405, 256, true),
+          fScale(1.0f)
     {
         std::memset(fParameters, 0, sizeof(float)*kParameterCount);
         std::memset(fStrBuf, 0, sizeof(char)*(0xff+1));
 
         fSampleRate = getSampleRate();
         fFont       = createFontFromFile("sans", "/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf");
+
+        setGeometryConstraints(405, 256, false);
     }
 
 protected:
@@ -69,13 +74,13 @@ protected:
     */
     void onNanoDisplay() override
     {
-        static const float lineHeight = 20;
+        const float lineHeight = 20 * fScale;
 
-        fontSize(15.0f);
+        fontSize(15.0f * fScale);
         textLineHeight(lineHeight);
 
-        float x = 0;
-        float y = 15;
+        float x = 0.0f * fScale;
+        float y = 15.0f * fScale;
 
         // buffer size
         drawLeft(x, y, "Buffer Size:");
@@ -104,8 +109,8 @@ protected:
         y+=lineHeight;
 
         // BBT
-        x = 200;
-        y = 15;
+        x = 200.0f * fScale;
+        y = 15.0f * fScale;
 
         const bool validBBT(fParameters[kParameterTimeValidBBT] > 0.5f);
         drawLeft(x, y, "BBT Valid:");
@@ -148,6 +153,14 @@ protected:
         y+=lineHeight;
     }
 
+
+    void onResize(const ResizeEvent& ev) override
+    {
+        fScale = static_cast<float>(ev.size.getHeight())/256.0f;
+
+        UI::onResize(ev);
+    }
+
     // -------------------------------------------------------------------------------------------------------
 
 private:
@@ -155,8 +168,9 @@ private:
     float  fParameters[kParameterCount];
     double fSampleRate;
 
-    // font
+    // UI stuff
     FontId fFont;
+    float fScale;
 
     // temp buf for text
     char fStrBuf[0xff+1];
@@ -190,7 +204,7 @@ private:
         beginPath();
         fillColor(200, 200, 200);
         textAlign(ALIGN_RIGHT|ALIGN_TOP);
-        textBox(x, y, 100, text);
+        textBox(x, y, 100 * fScale, text);
         closePath();
     }
 
@@ -199,7 +213,7 @@ private:
         beginPath();
         fillColor(255, 255, 255);
         textAlign(ALIGN_LEFT|ALIGN_TOP);
-        textBox(x+105, y, 100, text);
+        textBox(x + (105 * fScale), y, 100 * fScale, text);
         closePath();
     }