Make Link and IconButton inherit from Button privately

Each part of the code deals with either Links or IconButtons, but
not both: the base class is only used to share implementation and
not interface. Make this explicit by doing private inheritance.

src/button.cpp

@@ -5,23 +5,14 @@
 using namespace std;
 
 Button::Button(Touchscreen &ts_, bool doubleClick_)
-	: ts(ts_)
+	: action(BIND(&Button::voidAction))
-	, action(BIND(&Button::voidAction))
 	, rect((SDL_Rect) { 0, 0, 0, 0 })
+	, ts(ts_)
 	, doubleClick(doubleClick_)
 	, lastTick(0)
 {
 }
 
-void Button::paint() {
-	if (ts.inRect(rect))
-		if (!paintHover()) return;
-}
-
-bool Button::paintHover() {
-	return false;
-}
-
 bool Button::isPressed() {
 	return ts.pressed() && ts.inRect(rect);
 }
@@ -34,22 +25,20 @@ bool Button::handleTS() {
 	if (isReleased()) {
 		if (doubleClick) {
 			int tickNow = SDL_GetTicks();
-			if (tickNow - lastTick < 400)
+			if (tickNow - lastTick < 400) {
-				exec();
+				ts.setHandled();
+				action();
+			}
 			lastTick = tickNow;
 		} else {
-			exec();
+			ts.setHandled();
+			action();
 		}
 		return true;
 	}
 	return false;
 }
 
-void Button::exec() {
-	ts.setHandled();
-	action();
-}
-
 SDL_Rect Button::getRect() {
 	return rect;
 }
@@ -63,7 +52,3 @@ void Button::setPosition(int x, int y) {
 	rect.x = x;
 	rect.y = y;
 }
-
-void Button::setAction(function_t action) {
-	this->action = action;
-}

src/button.h

@@ -28,31 +28,29 @@
 class Touchscreen;
 
 class Button {
-protected:
-	Touchscreen &ts;
-	function_t action;
-	SDL_Rect rect;
-	bool doubleClick;
-	int lastTick;
-
 public:
+	SDL_Rect getRect();
+	virtual void setPosition(int x, int y);
+
+	bool isPressed();
+	bool handleTS();
+
+protected:
 	Button(Touchscreen &ts, bool doubleClick = false);
 	virtual ~Button() {};
 
-	SDL_Rect getRect();
 	void setSize(int w, int h);
-	virtual void setPosition(int x, int y);
 
-	virtual void paint();
+	function_t action;
-	virtual bool paintHover();
+	SDL_Rect rect;
 
-	bool isPressed();
+private:
 	bool isReleased();
-	bool handleTS();
-
-	void exec();
 	void voidAction() {};
-	void setAction(function_t action);
+
+	Touchscreen &ts;
+	bool doubleClick;
+	int lastTick;
 };
 
 #endif // BUTTON_H

src/iconbutton.cpp

@@ -14,10 +14,6 @@ IconButton::IconButton(
 {
 	this->icon = icon;
 	this->label = label;
-	updateSurfaces();
-}
-
-void IconButton::updateSurfaces() {
 	iconSurface = gmenu2x->sc[icon];
 	recalcSize();
 }
@@ -39,10 +35,6 @@ void IconButton::paint() {
 	}
 }
 
-bool IconButton::paintHover() {
-	return true;
-}
-
 void IconButton::recalcSize() {
 	Uint16 h = 0, w = 0;
 	if (iconSurface) {

src/iconbutton.h

@@ -8,25 +8,27 @@
 class GMenu2X;
 class Surface;
 
-class IconButton : public Button {
+class IconButton : private Button {
 public:
 	IconButton(GMenu2X *gmenu2x, Touchscreen &ts,
 			const std::string &icon, const std::string &label = "");
 	virtual ~IconButton() {};
 
 	virtual void paint();
-	virtual bool paintHover();
 
 	virtual void setPosition(int x, int y);
 
 	void setAction(function_t action);
 
+	// Expose some Button functionality:
+	SDL_Rect getRect() { return Button::getRect(); }
+	bool handleTS() { return Button::handleTS(); }
+
 private:
-	void updateSurfaces();
+	void recalcSize();
 
 	GMenu2X *gmenu2x;
 	std::string icon, label;
-	void recalcSize();
 	SDL_Rect iconRect, labelRect;
 
 	Surface *iconSurface;

src/link.cpp

@@ -51,12 +51,11 @@ void Link::paint() {
 	gmenu2x->s->write(gmenu2x->font, getTitle(), iconX+16, rect.y + gmenu2x->skinConfInt["linkHeight"]-padding, Font::HAlignCenter, Font::VAlignBottom);
 }
 
-bool Link::paintHover() {
+void Link::paintHover() {
 	if (gmenu2x->useSelectionPng)
 		gmenu2x->sc["imgs/selection.png"]->blit(gmenu2x->s, rect, Font::HAlignCenter, Font::VAlignMiddle);
 	else
 		gmenu2x->s->box(rect.x, rect.y, rect.w, rect.h, gmenu2x->skinConfColors[COLOR_SELECTION_BG]);
-	return true;
 }
 
 void Link::updateSurfaces()

src/link.h

@@ -35,7 +35,7 @@ Base class that represents a link on screen.
 
 	@author Massimiliano Torromeo <massimiliano.torromeo@gmail.com>
 */
-class Link : public Button {
+class Link : private Button {
 private:
 	void recalcCoordinates();
 
@@ -59,7 +59,7 @@ public:
 	virtual ~Link() {};
 
 	virtual void paint();
-	virtual bool paintHover();
+	void paintHover();
 
 	virtual void loadIcon();
 
@@ -75,6 +75,11 @@ public:
 	const std::string &getIconPath();
 
 	void run();
+
+	// Expose some Button functionality:
+	//SDL_Rect getRect() { return Button::getRect(); }
+	bool isPressed() { return Button::isPressed(); }
+	bool handleTS() { return Button::handleTS(); }
 };
 
 #endif