Make destructors virtual as appropriate.

19 files changed, 22 insertions, 9 deletions

diff --git a/plugingui/button.h b/plugingui/button.h
index f409a55..04656ba 100644
--- a/plugingui/button.h
+++ b/plugingui/button.h
@@ -40,7 +40,7 @@ namespace GUI {
 class Button : public Widget {
 public:
 	Button(Widget *parent);
-	~Button();
+	virtual ~Button();
 
 	// From Widget:
 	bool isFocusable() override { return true; }
diff --git a/plugingui/canvas.h b/plugingui/canvas.h
index 8cfe083..cafe483 100644
--- a/plugingui/canvas.h
+++ b/plugingui/canvas.h
@@ -35,6 +35,8 @@ namespace GUI
 class Canvas
 {
 public:
+	virtual ~Canvas() = default;
+
 	//! @returns a reference to the pixel buffer.
 	virtual PixelBufferAlpha& GetPixelBuffer() = 0;
 
diff --git a/plugingui/checkbox.h b/plugingui/checkbox.h
index f26c8d6..f85c1d9 100644
--- a/plugingui/checkbox.h
+++ b/plugingui/checkbox.h
@@ -36,6 +36,7 @@ namespace GUI {
 class CheckBox : public Widget {
 public:
 	CheckBox(Widget *parent);
+	virtual ~CheckBox() = default;
 
 	void setText(std::string text);
 
diff --git a/plugingui/combobox.h b/plugingui/combobox.h
index 2cf0eba..8946600 100644
--- a/plugingui/combobox.h
+++ b/plugingui/combobox.h
@@ -43,7 +43,7 @@ class ComboBox
 {
 public:
 	ComboBox(Widget* parent);
-	~ComboBox();
+	virtual ~ComboBox();
 
 	void addItem(std::string name, std::string value);
 
diff --git a/plugingui/drawable.h b/plugingui/drawable.h
index 346102d..ff9a4ff 100644
--- a/plugingui/drawable.h
+++ b/plugingui/drawable.h
@@ -36,6 +36,8 @@ class Colour;
 class Drawable
 {
 public:
+	virtual ~Drawable() = default;
+
 	virtual std::size_t width() const = 0;
 	virtual std::size_t height() const = 0;
 
diff --git a/plugingui/filebrowser.h b/plugingui/filebrowser.h
index bc2019f..20f8197 100644
--- a/plugingui/filebrowser.h
+++ b/plugingui/filebrowser.h
@@ -41,7 +41,7 @@ namespace GUI {
 class FileBrowser : public Widget {
 public:
 	FileBrowser(Widget *parent);
-	~FileBrowser();
+	virtual ~FileBrowser();
 
 	void setPath(const std::string& path);
 
diff --git a/plugingui/knob.h b/plugingui/knob.h
index 220ee80..64d66e1 100644
--- a/plugingui/knob.h
+++ b/plugingui/knob.h
@@ -37,6 +37,7 @@ namespace GUI {
 class Knob : public Widget {
 public:
 	Knob(Widget *parent);
+	virtual ~Knob() = default;
 
 	// From Widget:
 	bool catchMouse() override { return true; }
diff --git a/plugingui/label.h b/plugingui/label.h
index 019df17..f76a598 100644
--- a/plugingui/label.h
+++ b/plugingui/label.h
@@ -43,6 +43,7 @@ enum class TextAlignment {
 class Label : public Widget {
 public:
 	Label(Widget *parent);
+	virtual ~Label() = default;
 
 	void setText(const std::string& text);
 
diff --git a/plugingui/lineedit.h b/plugingui/lineedit.h
index d5d68b6..76babcc 100644
--- a/plugingui/lineedit.h
+++ b/plugingui/lineedit.h
@@ -41,7 +41,7 @@ class LineEdit
 {
 public:
 	LineEdit(Widget *parent);
-	~LineEdit();
+	virtual ~LineEdit();
 
 	bool isFocusable() override { return true; }
 
diff --git a/plugingui/listbox.h b/plugingui/listbox.h
index 1d5ed14..3032951 100644
--- a/plugingui/listbox.h
+++ b/plugingui/listbox.h
@@ -42,7 +42,7 @@ class ListBox
 {
 public:
 	ListBox(Widget *parent);
-	~ListBox();
+	virtual ~ListBox();
 
 	void addItem(std::string name, std::string value);
 	void addItems(std::vector<ListBoxBasic::Item> &items);
diff --git a/plugingui/listboxbasic.h b/plugingui/listboxbasic.h
index 73d841d..ae2bdae 100644
--- a/plugingui/listboxbasic.h
+++ b/plugingui/listboxbasic.h
@@ -47,7 +47,7 @@ public:
 	};
 
 	ListBoxBasic(Widget *parent);
-	~ListBoxBasic();
+	virtual ~ListBoxBasic();
 
 	void addItem(const std::string& name, const std::string& value);
 	void addItems(const std::vector<Item>& items);
diff --git a/plugingui/listboxthin.h b/plugingui/listboxthin.h
index 3f429f6..a5605f2 100644
--- a/plugingui/listboxthin.h
+++ b/plugingui/listboxthin.h
@@ -44,7 +44,7 @@ class ListBoxThin
 {
 public:
 	ListBoxThin(Widget *parent);
-	~ListBoxThin();
+	virtual ~ListBoxThin();
 
 	void addItem(std::string name, std::string value);
 	void addItems(std::vector<ListBoxBasic::Item> &items);
diff --git a/plugingui/progressbar.h b/plugingui/progressbar.h
index 9c651ef..bc8b82e 100644
--- a/plugingui/progressbar.h
+++ b/plugingui/progressbar.h
@@ -48,7 +48,7 @@ class ProgressBar
 {
 public:
 	ProgressBar(Widget* parent);
-	~ProgressBar();
+	virtual ~ProgressBar();
 
 	void setTotal(std::size_t total);
 	void setValue(std::size_t value);
diff --git a/plugingui/slider.h b/plugingui/slider.h
index 694be59..1ef3070 100644
--- a/plugingui/slider.h
+++ b/plugingui/slider.h
@@ -33,6 +33,7 @@ namespace GUI {
 class Slider : public Widget {
 public:
 	Slider(Widget* parent);
+	virtual ~Slider() = default;
 
 	// From Widget:
 	bool catchMouse() override { return true; }
diff --git a/plugingui/textedit.h b/plugingui/textedit.h
index ed93ae5..edad302 100644
--- a/plugingui/textedit.h
+++ b/plugingui/textedit.h
@@ -41,7 +41,7 @@ namespace GUI {
 class TextEdit : public Widget {
 public:
 	TextEdit(Widget *parent);
-	~TextEdit();
+	virtual ~TextEdit();
 
 	// From Widget
 	bool isFocusable() override { return true; }
diff --git a/plugingui/verticalline.h b/plugingui/verticalline.h
index dce5563..3403244 100644
--- a/plugingui/verticalline.h
+++ b/plugingui/verticalline.h
@@ -34,6 +34,7 @@ namespace GUI {
 class VerticalLine : public Widget {
 public:
 	VerticalLine(Widget* parent);
+	virtual ~VerticalLine() = default;
 
 protected:
 	// From Widget:
diff --git a/src/drumkitparser.h b/src/drumkitparser.h
index 444b459..cc1b3d6 100644
--- a/src/drumkitparser.h
+++ b/src/drumkitparser.h
@@ -35,6 +35,7 @@ class DrumKitParser
 {
 public:
 	DrumKitParser(Settings& setting, DrumKit& kit, Random& rand);
+	virtual ~DrumKitParser() = default;
 
 	virtual int parseFile(const std::string& filename) override;
 
diff --git a/src/inputfilter.h b/src/inputfilter.h
index 26f7294..45dd01e 100644
--- a/src/inputfilter.h
+++ b/src/inputfilter.h
@@ -32,6 +32,8 @@
 class InputFilter
 {
 public:
+	virtual ~InputFilter() = default;
+
 	//! Implement to filter a single event.
 	//! \param[in,out] event The event being processed. The filter method
 	//!  might alter any of the event parameters.
diff --git a/src/instrumentparser.h b/src/instrumentparser.h
index 793bfb6..512f12f 100644
--- a/src/instrumentparser.h
+++ b/src/instrumentparser.h
@@ -37,6 +37,7 @@ class InstrumentParser
 {
 public:
 	InstrumentParser(Instrument &instrument);
+	virtual ~InstrumentParser() = default;
 
 	virtual int parseFile(const std::string& filename) override;