Codechange: Make GetCurrentRect() conform to usual Rect bounds, and reuse it.

Similar code is already repeated in other locations.

src/station_gui.cpp

@@ -1440,7 +1440,7 @@ struct StationViewWindow : public Window {
 		if (!this->IsShaded()) {
 			/* Draw 'accepted cargo' or 'cargo ratings'. */
 			const NWidgetBase *wid = this->GetWidget<NWidgetBase>(WID_SV_ACCEPT_RATING_LIST);
-			const Rect r = {(int)wid->pos_x, (int)wid->pos_y, (int)(wid->pos_x + wid->current_x - 1), (int)(wid->pos_y + wid->current_y - 1)};
+			const Rect r = wid->GetCurrentRect();
 			if (this->GetWidget<NWidgetCore>(WID_SV_ACCEPTS_RATINGS)->widget_data == STR_STATION_VIEW_RATINGS_BUTTON) {
 				int lines = this->DrawAcceptedCargo(r);
 				if (lines > this->accepts_lines) { // Resize the widget, and perform re-initialization of the window.
@@ -1468,7 +1468,7 @@ struct StationViewWindow : public Window {
 
 			/* Draw waiting cargo. */
 			NWidgetBase *nwi = this->GetWidget<NWidgetBase>(WID_SV_WAITING);
-			Rect waiting_rect = { (int)nwi->pos_x, (int)nwi->pos_y, (int)(nwi->pos_x + nwi->current_x - 1), (int)(nwi->pos_y + nwi->current_y - 1)};
+			Rect waiting_rect = nwi->GetCurrentRect();
 			this->DrawEntries(&cargo, waiting_rect, pos, maxrows, 0);
 			scroll_to_row = INT_MAX;
 		}

src/widget.cpp

@@ -1964,11 +1964,7 @@ void NWidgetBackground::Draw(const Window *w)
 {
 	if (this->current_x == 0 || this->current_y == 0) return;
 
-	Rect r;
-	r.left = this->pos_x;
-	r.right = this->pos_x + this->current_x - 1;
-	r.top = this->pos_y;
-	r.bottom = this->pos_y + this->current_y - 1;
+	Rect r = this->GetCurrentRect();
 
 	const DrawPixelInfo *dpi = _cur_dpi;
 	if (dpi->left > r.right || dpi->left + dpi->width <= r.left || dpi->top > r.bottom || dpi->top + dpi->height <= r.top) return;
@@ -2232,11 +2228,7 @@ void NWidgetScrollbar::Draw(const Window *w)
 {
 	if (this->current_x == 0 || this->current_y == 0) return;
 
-	Rect r;
-	r.left = this->pos_x;
-	r.right = this->pos_x + this->current_x - 1;
-	r.top = this->pos_y;
-	r.bottom = this->pos_y + this->current_y - 1;
+	Rect r = this->GetCurrentRect();
 
 	const DrawPixelInfo *dpi = _cur_dpi;
 	if (dpi->left > r.right || dpi->left + dpi->width <= r.left || dpi->top > r.bottom || dpi->top + dpi->height <= r.top) return;
@@ -2615,11 +2607,7 @@ void NWidgetLeaf::Draw(const Window *w)
 	DrawPixelInfo *old_dpi = _cur_dpi;
 	_cur_dpi = &new_dpi;
 
-	Rect r;
-	r.left = this->pos_x;
-	r.right = this->pos_x + this->current_x - 1;
-	r.top = this->pos_y;
-	r.bottom = this->pos_y + this->current_y - 1;
+	Rect r = this->GetCurrentRect();
 
 	bool clicked = this->IsLowered();
 	switch (this->type) {

src/widget_type.h

@@ -167,8 +167,8 @@ public:
 		Rect r;
 		r.left = this->pos_x;
 		r.top = this->pos_y;
-		r.right = this->pos_x + this->current_x;
-		r.bottom = this->pos_y + this->current_y;
+		r.right = this->pos_x + this->current_x - 1;
+		r.bottom = this->pos_y + this->current_y - 1;
 		return r;
 	}
 

src/widgets/dropdown.cpp

@@ -448,12 +448,8 @@ void ShowDropDownList(Window *w, DropDownList &&list, int selected, int button,
 {
 	/* Our parent's button widget is used to determine where to place the drop
 	 * down list window. */
-	Rect wi_rect;
 	NWidgetCore *nwi = w->GetWidget<NWidgetCore>(button);
-	wi_rect.left   = nwi->pos_x;
-	wi_rect.right  = nwi->pos_x + nwi->current_x - 1;
-	wi_rect.top    = nwi->pos_y;
-	wi_rect.bottom = nwi->pos_y + nwi->current_y - 1;
+	Rect wi_rect      = nwi->GetCurrentRect();
 	Colours wi_colour = nwi->colour;
 
 	if ((nwi->type & WWT_MASK) == NWID_BUTTON_DROPDOWN) {

src/window.cpp

@@ -2097,10 +2097,7 @@ static void EnsureVisibleCaption(Window *w, int nx, int ny)
 	Rect caption_rect;
 	const NWidgetBase *caption = w->nested_root->GetWidgetOfType(WWT_CAPTION);
 	if (caption != nullptr) {
-		caption_rect.left   = caption->pos_x;
-		caption_rect.right  = caption->pos_x + caption->current_x;
-		caption_rect.top    = caption->pos_y;
-		caption_rect.bottom = caption->pos_y + caption->current_y;
+		caption_rect = caption->GetCurrentRect();
 
 		/* Make sure the window doesn't leave the screen */
 		nx = Clamp(nx, MIN_VISIBLE_TITLE_BAR - caption_rect.right, _screen.width - MIN_VISIBLE_TITLE_BAR - caption_rect.left);