Codechange: Use unified NWidgetContainer methods instead of duplicating.

Most NWidgetContainer derivatives implemented Draw() and GetWidgetFromPos()
the same way. Move this these to NWidgetContainer itself to avoid repeating.

src/network/network_gui.cpp

@@ -161,24 +161,6 @@ public:
 			}
 		}
 	}
-
-	void Draw(const Window *w) override
-	{
-		for (NWidgetBase *child_wid = this->head; child_wid != nullptr; child_wid = child_wid->next) {
-			child_wid->Draw(w);
-		}
-	}
-
-	NWidgetCore *GetWidgetFromPos(int x, int y) override
-	{
-		if (!IsInsideBS(x, this->pos_x, this->current_x) || !IsInsideBS(y, this->pos_y, this->current_y)) return nullptr;
-
-		for (NWidgetBase *child_wid = this->head; child_wid != nullptr; child_wid = child_wid->next) {
-			NWidgetCore *nwid = child_wid->GetWidgetFromPos(x, y);
-			if (nwid != nullptr) return nwid;
-		}
-		return nullptr;
-	}
 };
 
 class NetworkGameWindow : public Window {

src/smallmap_gui.cpp

@@ -1763,21 +1763,6 @@ public:
 		display->AssignSizePosition(ST_RESIZE, x, y, given_width, display_height, rtl);
 		bar->AssignSizePosition(ST_RESIZE, x, y + display_height, given_width, bar_height, rtl);
 	}
-
-	NWidgetCore *GetWidgetFromPos(int x, int y) override
-	{
-		if (!IsInsideBS(x, this->pos_x, this->current_x) || !IsInsideBS(y, this->pos_y, this->current_y)) return nullptr;
-		for (NWidgetBase *child_wid = this->head; child_wid != nullptr; child_wid = child_wid->next) {
-			NWidgetCore *widget = child_wid->GetWidgetFromPos(x, y);
-			if (widget != nullptr) return widget;
-		}
-		return nullptr;
-	}
-
-	void Draw(const Window *w) override
-	{
-		for (NWidgetBase *child_wid = this->head; child_wid != nullptr; child_wid = child_wid->next) child_wid->Draw(w);
-	}
 };
 
 /** Widget parts of the smallmap display. */

src/toolbar_gui.cpp

@@ -1477,21 +1477,7 @@ public:
 		GfxFillRect(this->pos_x, this->pos_y, this->pos_x + this->current_x - 1, this->pos_y + this->current_y - 1, PC_VERY_DARK_RED);
 		GfxFillRect(this->pos_x, this->pos_y, this->pos_x + this->current_x - 1, this->pos_y + this->current_y - 1, PC_DARK_RED, FILLRECT_CHECKER);
 
-		bool rtl = _current_text_dir == TD_RTL;
+		this->NWidgetContainer::Draw(w);
-		for (NWidgetBase *child_wid = rtl ? this->tail : this->head; child_wid != nullptr; child_wid = rtl ? child_wid->prev : child_wid->next) {
-			child_wid->Draw(w);
-		}
-	}
-
-	NWidgetCore *GetWidgetFromPos(int x, int y) override
-	{
-		if (!IsInsideBS(x, this->pos_x, this->current_x) || !IsInsideBS(y, this->pos_y, this->current_y)) return nullptr;
-
-		for (NWidgetBase *child_wid = this->head; child_wid != nullptr; child_wid = child_wid->next) {
-			NWidgetCore *nwid = child_wid->GetWidgetFromPos(x, y);
-			if (nwid != nullptr) return nwid;
-		}
-		return nullptr;
 	}
 
 	/**

src/widget.cpp

@@ -1303,6 +1303,24 @@ void NWidgetContainer::FillNestedArray(NWidgetBase **array, uint length)
 	}
 }
 
+void NWidgetContainer::Draw(const Window *w)
+{
+	for (NWidgetBase *child_wid = this->head; child_wid != nullptr; child_wid = child_wid->next) {
+		child_wid->Draw(w);
+	}
+}
+
+NWidgetCore *NWidgetContainer::GetWidgetFromPos(int x, int y)
+{
+	if (!IsInsideBS(x, this->pos_x, this->current_x) || !IsInsideBS(y, this->pos_y, this->current_y)) return nullptr;
+
+	for (NWidgetBase *child_wid = this->head; child_wid != nullptr; child_wid = child_wid->next) {
+		NWidgetCore *nwid = child_wid->GetWidgetFromPos(x, y);
+		if (nwid != nullptr) return nwid;
+	}
+	return nullptr;
+}
+
 /**
  * Widgets stacked on top of each other.
  */
@@ -1465,24 +1483,6 @@ void NWidgetPIPContainer::SetPIP(uint8_t pip_pre, uint8_t pip_inter, uint8_t pip
 	this->pip_post = ScaleGUITrad(this->uz_pip_post);
 }
 
-void NWidgetPIPContainer::Draw(const Window *w)
-{
-	for (NWidgetBase *child_wid = this->head; child_wid != nullptr; child_wid = child_wid->next) {
-		child_wid->Draw(w);
-	}
-}
-
-NWidgetCore *NWidgetPIPContainer::GetWidgetFromPos(int x, int y)
-{
-	if (!IsInsideBS(x, this->pos_x, this->current_x) || !IsInsideBS(y, this->pos_y, this->current_y)) return nullptr;
-
-	for (NWidgetBase *child_wid = this->head; child_wid != nullptr; child_wid = child_wid->next) {
-		NWidgetCore *nwid = child_wid->GetWidgetFromPos(x, y);
-		if (nwid != nullptr) return nwid;
-	}
-	return nullptr;
-}
-
 /** Horizontal container widget. */
 NWidgetHorizontal::NWidgetHorizontal(NWidContainerFlags flags) : NWidgetPIPContainer(NWID_HORIZONTAL, flags)
 {

src/widget_type.h

@@ -412,6 +412,9 @@ public:
 	void Add(NWidgetBase *wid);
 	void FillNestedArray(NWidgetBase **array, uint length) override;
 
+	void Draw(const Window *w) override;
+	NWidgetCore *GetWidgetFromPos(int x, int y) override;
+
 	/** Return whether the container is empty. */
 	inline bool IsEmpty() { return head == nullptr; }
 
@@ -480,9 +483,6 @@ public:
 	void AdjustPaddingForZoom() override;
 	void SetPIP(uint8_t pip_pre, uint8_t pip_inter, uint8_t pip_post);
 
-	void Draw(const Window *w) override;
-	NWidgetCore *GetWidgetFromPos(int x, int y) override;
-
 protected:
 	NWidContainerFlags flags; ///< Flags of the container.
 	uint8_t pip_pre;            ///< Amount of space before first widget.