Added helper objects to Label and Slider to allow lambda callbacks

modules/juce_gui_basics/widgets/juce_Label.cpp

@@ -191,6 +191,12 @@ void Label::editorShown (TextEditor* textEditor)
 {
     Component::BailOutChecker checker (this);
     listeners.callChecked (checker, [this, textEditor] (Label::Listener& l) { l.editorShown (this, *textEditor); });
+
+    if (checker.shouldBailOut())
+        return;
+
+    if (onEditorShow != nullptr)
+        onEditorShow();
 }
 
 void Label::editorAboutToBeHidden (TextEditor* textEditor)
@@ -200,6 +206,12 @@ void Label::editorAboutToBeHidden (TextEditor* textEditor)
 
     Component::BailOutChecker checker (this);
     listeners.callChecked (checker, [this, textEditor] (Label::Listener& l) { l.editorHidden (this, *textEditor); });
+
+    if (checker.shouldBailOut())
+        return;
+
+    if (onEditorHide != nullptr)
+        onEditorHide();
 }
 
 void Label::showEditor()
@@ -404,6 +416,12 @@ void Label::callChangeListeners()
 {
     Component::BailOutChecker checker (this);
     listeners.callChecked (checker, [this] (Listener& l) { l.labelTextChanged (this); });
+
+    if (checker.shouldBailOut())
+        return;
+
+    if (onTextChange != nullptr)
+        onTextChange();
 }
 
 //==============================================================================

modules/juce_gui_basics/widgets/juce_Label.h

@@ -200,6 +200,16 @@ public:
     /** Deregisters a previously-registered listener. */
     void removeListener (Listener* listener);
 
+    //==============================================================================
+    /** You can assign a lambda to this callback object to have it called when the label text is changed. */
+    std::function<void()> onTextChange;
+
+    /** You can assign a lambda to this callback object to have it called when the label's editor is shown. */
+    std::function<void()> onEditorShow;
+
+    /** You can assign a lambda to this callback object to have it called when the label's editor is hidden. */
+    std::function<void()> onEditorHide;
+
     //==============================================================================
     /** Makes the label turn into a TextEditor when clicked.
 

modules/juce_gui_basics/widgets/juce_Slider.cpp

@@ -320,6 +320,12 @@ public:
 
         Component::BailOutChecker checker (&owner);
         listeners.callChecked (checker, [&] (Slider::Listener& l) { l.sliderValueChanged (&owner); });
+
+        if (checker.shouldBailOut())
+            return;
+
+        if (owner.onValueChange != nullptr)
+            owner.onValueChange();
     }
 
     void sendDragStart()
@@ -328,6 +334,12 @@ public:
 
         Component::BailOutChecker checker (&owner);
         listeners.callChecked (checker, [&] (Slider::Listener& l) { l.sliderDragStarted (&owner); });
+
+        if (checker.shouldBailOut())
+            return;
+
+        if (owner.onDragStart != nullptr)
+            owner.onDragStart();
     }
 
     void sendDragEnd()
@@ -337,6 +349,12 @@ public:
 
         Component::BailOutChecker checker (&owner);
         listeners.callChecked (checker, [&] (Slider::Listener& l) { l.sliderDragEnded (&owner); });
+
+        if (checker.shouldBailOut())
+            return;
+
+        if (owner.onDragEnd != nullptr)
+            owner.onDragEnd();
     }
 
     struct DragInProgress

modules/juce_gui_basics/widgets/juce_Slider.h

@@ -586,6 +586,16 @@ public:
     /** Removes a previously-registered listener. */
     void removeListener (Listener* listener);
 
+    //==============================================================================
+    /** You can assign a lambda to this callback object to have it called when the slider value is changed. */
+    std::function<void()> onValueChange;
+
+    /** You can assign a lambda to this callback object to have it called when the slider's drag begins. */
+    std::function<void()> onDragStart;
+
+    /** You can assign a lambda to this callback object to have it called when the slider's drag ends. */
+    std::function<void()> onDragEnd;
+
     //==============================================================================
     /** This lets you choose whether double-clicking moves the slider to a given position.