(svn r17373) -Codechange: make the timetable, station and subsidy GUIs use scrollbar wrappers

3 files changed, 43 insertions, 42 deletions

diff --git a/src/station_gui.cpp b/src/station_gui.cpp
index 424e8e7c7..c2861429a 100644
--- a/src/station_gui.cpp
+++ b/src/station_gui.cpp
@@ -173,6 +173,8 @@ protected:
 
 		this->stations.Compact();
 		this->stations.RebuildDone();
+
+		this->vscroll.SetCount(this->stations.Length()); // Update the scrollbar
 	}
 
 	/** Sort stations by their name */
@@ -259,7 +261,7 @@ public:
 	CompanyStationsWindow(const WindowDesc *desc, WindowNumber window_number) : Window(desc, window_number)
 	{
 		this->owner = (Owner)this->window_number;
-		this->vscroll.cap = 12;
+		this->vscroll.SetCapacity(12);
 		this->resize.step_height = 10;
 		this->resize.height = this->height - 10 * 7; // minimum if 5 in the list
 
@@ -335,11 +337,9 @@ public:
 		this->BuildStationsList(owner);
 		this->SortStationsList();
 
-		SetVScrollCount(this, this->stations.Length());
-
 		/* draw widgets, with company's name in the caption */
 		SetDParam(0, owner);
-		SetDParam(1, this->vscroll.count);
+		SetDParam(1, this->vscroll.GetCount());
 
 		this->DrawWidgets();
 
@@ -370,15 +370,15 @@ public:
 		cg_ofst = this->IsWidgetLowered(SLW_FACILALL) ? 2 : 1;
 		DrawString(71 + cg_ofst, 71 + cg_ofst + 12, y + cg_ofst, STR_ABBREV_ALL, TC_BLACK);
 
-		if (this->vscroll.count == 0) { // company has no stations
+		if (this->vscroll.GetCount() == 0) { // company has no stations
 			DrawString(xb, this->width, 40, STR_STATION_LIST_NONE);
 			return;
 		}
 
-		int max = min(this->vscroll.pos + this->vscroll.cap, this->stations.Length());
+		int max = min(this->vscroll.GetPosition() + this->vscroll.GetCapacity(), this->stations.Length());
 		y = 40; // start of the list-widget
 
-		for (int i = this->vscroll.pos; i < max; ++i) { // do until max number of stations of owner
+		for (int i = this->vscroll.GetPosition(); i < max; ++i) { // do until max number of stations of owner
 			const Station *st = this->stations[i];
 			int x;
 
@@ -409,9 +409,9 @@ public:
 			case SLW_LIST: {
 				uint32 id_v = (pt.y - 41) / 10;
 
-				if (id_v >= this->vscroll.cap) return; // click out of bounds
+				if (id_v >= this->vscroll.GetCapacity()) return; // click out of bounds
 
-				id_v += this->vscroll.pos;
+				id_v += this->vscroll.GetPosition();
 
 				if (id_v >= this->stations.Length()) return; // click out of list bound
 
@@ -568,7 +568,7 @@ public:
 
 	virtual void OnResize(Point delta)
 	{
-		this->vscroll.cap += delta.y / 10;
+		this->vscroll.UpdateCapacity(delta.y / 10);
 	}
 
 	virtual void OnInvalidateData(int data)
@@ -789,7 +789,7 @@ struct StationViewWindow : public Window {
 	{
 		Owner owner = Station::Get(window_number)->owner;
 		if (owner != OWNER_NONE) this->owner = owner;
-		this->vscroll.cap = 5;
+		this->vscroll.SetCapacity(5);
 		this->resize.step_height = 10;
 
 		this->FindWindowPlacementAndResize(desc);
@@ -852,7 +852,7 @@ struct StationViewWindow : public Window {
 				}
 			}
 		}
-		SetVScrollCount(this, (int)cargolist.size() + 1); // update scrollbar
+		this->vscroll.SetCount((int)cargolist.size() + 1); // update scrollbar
 
 		/* disable some buttons */
 		this->SetWidgetDisabledState(SVW_RENAME,   st->owner != _local_company);
@@ -867,10 +867,10 @@ struct StationViewWindow : public Window {
 
 		int x = 2;  ///< coordinates used for printing waiting/accepted/rating of cargo
 		int y = 15;
-		int pos = this->vscroll.pos; ///< = this->vscroll.pos
+		int pos = this->vscroll.GetPosition();
 
 		uint width = this->widget[SVW_WAITING].right - this->widget[SVW_WAITING].left - 4;
-		int maxrows = this->vscroll.cap;
+		int maxrows = this->vscroll.GetCapacity();
 
 		StringID str;
 
@@ -979,7 +979,7 @@ struct StationViewWindow : public Window {
 	{
 		switch (widget) {
 			case SVW_WAITING:
-				this->HandleCargoWaitingClick((pt.y - this->widget[SVW_WAITING].top) / 10 + this->vscroll.pos);
+				this->HandleCargoWaitingClick((pt.y - this->widget[SVW_WAITING].top) / 10 + this->vscroll.GetPosition());
 				break;
 
 			case SVW_LOCATION:
@@ -1053,7 +1053,7 @@ struct StationViewWindow : public Window {
 	virtual void OnResize(Point delta)
 	{
 		if (delta.x != 0) ResizeButtons(this, SVW_LOCATION, SVW_RENAME);
-		this->vscroll.cap += delta.y / (int)this->resize.step_height;
+		this->vscroll.UpdateCapacity(delta.y / (int)this->resize.step_height);
 	}
 };
 
@@ -1224,7 +1224,7 @@ struct SelectStationWindow : Window {
 		select_station_cmd(cmd),
 		area(ta)
 	{
-		this->vscroll.cap = 6;
+		this->vscroll.SetCapacity(6);
 		this->resize.step_height = 10;
 
 		FindStationsNearby<T>(this->area, true);
@@ -1235,19 +1235,19 @@ struct SelectStationWindow : Window {
 
 	virtual void OnPaint()
 	{
-		SetVScrollCount(this, _stations_nearby_list.Length() + 1);
+		this->vscroll.SetCount(_stations_nearby_list.Length() + 1);
 
 		this->DrawWidgets();
 
 		uint y = 17;
-		if (this->vscroll.pos == 0) {
+		if (this->vscroll.GetPosition() == 0) {
 			DrawString(3, this->widget[JSW_PANEL].right - 2, y, T::EXPECTED_FACIL == FACIL_WAYPOINT ? STR_JOIN_WAYPOINT_CREATE_SPLITTED_WAYPOINT : STR_JOIN_STATION_CREATE_SPLITTED_STATION);
 			y += 10;
 		}
 
-		for (uint i = max<uint>(1, this->vscroll.pos); i <= _stations_nearby_list.Length(); ++i, y += 10) {
+		for (uint i = max<uint>(1, this->vscroll.GetPosition()); i <= _stations_nearby_list.Length(); ++i, y += 10) {
 			/* Don't draw anything if it extends past the end of the window. */
-			if (i - this->vscroll.pos >= this->vscroll.cap) break;
+			if (i - this->vscroll.GetPosition() >= this->vscroll.GetCapacity()) break;
 
 			const T *st = T::Get(_stations_nearby_list[i - 1]);
 			SetDParam(0, st->index);
@@ -1260,7 +1260,7 @@ struct SelectStationWindow : Window {
 	{
 		if (widget != JSW_PANEL) return;
 
-		uint32 st_index = (pt.y - 16) / 10 + this->vscroll.pos;
+		uint32 st_index = (pt.y - 16) / 10 + this->vscroll.GetPosition();
 		bool distant_join = (st_index > 0);
 		if (distant_join) st_index--;
 
@@ -1287,7 +1287,7 @@ struct SelectStationWindow : Window {
 
 	virtual void OnResize(Point delta)
 	{
-		this->vscroll.cap = (this->widget[JSW_PANEL].bottom - this->widget[JSW_PANEL].top) / 10;
+		this->vscroll.UpdateCapacity((this->widget[JSW_PANEL].bottom - this->widget[JSW_PANEL].top) / 10);
 	}
 
 	virtual void OnInvalidateData(int data)
diff --git a/src/subsidy_gui.cpp b/src/subsidy_gui.cpp
index a57f87584..fec94b8bc 100644
--- a/src/subsidy_gui.cpp
+++ b/src/subsidy_gui.cpp
@@ -41,7 +41,7 @@ struct SubsidyListWindow : Window {
 	{
 		this->InitNested(desc, window_number);
 		this->OnInvalidateData(0);
-		this->vscroll.cap = this->nested_array[SLW_PANEL]->current_y / this->resize.step_height;
+		this->vscroll.SetCapacity(this->nested_array[SLW_PANEL]->current_y / this->resize.step_height);
 	}
 
 	virtual void OnClick(Point pt, int widget)
@@ -49,9 +49,9 @@ struct SubsidyListWindow : Window {
 		if (widget != SLW_PANEL) return;
 
 		int y = (pt.y - this->nested_array[SLW_PANEL]->pos_y - WD_FRAMERECT_TOP) / this->resize.step_height;
-		if (!IsInsideMM(y, 0, this->vscroll.cap)) return;
+		if (!IsInsideMM(y, 0, this->vscroll.GetCapacity())) return;
 
-		y += this->vscroll.pos;
+		y += this->vscroll.GetPosition();
 
 		int num = 0;
 		const Subsidy *s;
@@ -168,17 +168,18 @@ struct SubsidyListWindow : Window {
 		int y = r.top + WD_FRAMERECT_TOP;
 		int x = r.left + WD_FRAMERECT_LEFT;
 
-		int pos = -this->vscroll.pos;
+		int pos = -this->vscroll.GetPosition();
+		const int cap = this->vscroll.GetCapacity();
 
 		/* Section for drawing the offered subisidies */
-		if (IsInsideMM(pos, 0, this->vscroll.cap)) DrawString(x, right, y + pos * FONT_HEIGHT_NORMAL, STR_SUBSIDIES_OFFERED_TITLE);
+		if (IsInsideMM(pos, 0, cap)) DrawString(x, right, y + pos * FONT_HEIGHT_NORMAL, STR_SUBSIDIES_OFFERED_TITLE);
 		pos++;
 
 		uint num = 0;
 		const Subsidy *s;
 		FOR_ALL_SUBSIDIES(s) {
 			if (!s->IsAwarded()) {
-				if (IsInsideMM(pos, 0, this->vscroll.cap)) {
+				if (IsInsideMM(pos, 0, cap)) {
 					/* Displays the two offered towns */
 					SetupSubsidyDecodeParam(s, 1);
 					SetDParam(7, _date - ymd.day + s->remaining * 32);
@@ -190,19 +191,19 @@ struct SubsidyListWindow : Window {
 		}
 
 		if (num == 0) {
-			if (IsInsideMM(pos, 0, this->vscroll.cap)) DrawString(x, right, y + pos * FONT_HEIGHT_NORMAL, STR_SUBSIDIES_NONE);
+			if (IsInsideMM(pos, 0, cap)) DrawString(x, right, y + pos * FONT_HEIGHT_NORMAL, STR_SUBSIDIES_NONE);
 			pos++;
 		}
 
 		/* Section for drawing the already granted subisidies */
 		pos++;
-		if (IsInsideMM(pos, 0, this->vscroll.cap)) DrawString(x, right, y + pos * FONT_HEIGHT_NORMAL, STR_SUBSIDIES_SUBSIDISED_TITLE);
+		if (IsInsideMM(pos, 0, cap)) DrawString(x, right, y + pos * FONT_HEIGHT_NORMAL, STR_SUBSIDIES_SUBSIDISED_TITLE);
 		pos++;
 		num = 0;
 
 		FOR_ALL_SUBSIDIES(s) {
 			if (s->IsAwarded()) {
-				if (IsInsideMM(pos, 0, this->vscroll.cap)) {
+				if (IsInsideMM(pos, 0, cap)) {
 					SetupSubsidyDecodeParam(s, 1);
 					SetDParam(7, s->awarded);
 					SetDParam(8, _date - ymd.day + s->remaining * 32);
@@ -216,19 +217,19 @@ struct SubsidyListWindow : Window {
 		}
 
 		if (num == 0) {
-			if (IsInsideMM(pos, 0, this->vscroll.cap)) DrawString(x, right, y + pos * FONT_HEIGHT_NORMAL, STR_SUBSIDIES_NONE);
+			if (IsInsideMM(pos, 0, cap)) DrawString(x, right, y + pos * FONT_HEIGHT_NORMAL, STR_SUBSIDIES_NONE);
 			pos++;
 		}
 	}
 
 	virtual void OnResize(Point delta)
 	{
-		this->vscroll.cap += delta.y / (int)this->resize.step_height;
+		this->vscroll.UpdateCapacity(delta.y / (int)this->resize.step_height);
 	}
 
 	virtual void OnInvalidateData(int data)
 	{
-		SetVScrollCount(this, this->CountLines());
+		this->vscroll.SetCount(this->CountLines());
 	}
 };
 
diff --git a/src/timetable_gui.cpp b/src/timetable_gui.cpp
index 10ced998b..46db9d703 100644
--- a/src/timetable_gui.cpp
+++ b/src/timetable_gui.cpp
@@ -59,7 +59,7 @@ struct TimetableWindow : Window {
 	{
 		this->vehicle = Vehicle::Get(window_number);
 		this->owner = this->vehicle->owner;
-		this->vscroll.cap = 8;
+		this->vscroll.SetCapacity(8);
 		this->resize.step_height = 10;
 		this->sel_index = -1;
 
@@ -75,9 +75,9 @@ struct TimetableWindow : Window {
 		 */
 		int sel = (y - 15) / 10;
 
-		if ((uint)sel >= this->vscroll.cap) return INVALID_ORDER;
+		if ((uint)sel >= this->vscroll.GetCapacity()) return INVALID_ORDER;
 
-		sel += this->vscroll.pos;
+		sel += this->vscroll.GetPosition();
 
 		return (sel < v->GetNumOrders() * 2 && sel >= 0) ? sel : INVALID_ORDER;
 	}
@@ -148,7 +148,7 @@ struct TimetableWindow : Window {
 		const Vehicle *v = this->vehicle;
 		int selected = this->sel_index;
 
-		SetVScrollCount(this, v->GetNumOrders() * 2);
+		this->vscroll.SetCount(v->GetNumOrders() * 2);
 
 		if (v->owner == _local_company) {
 			bool disable = true;
@@ -179,7 +179,7 @@ struct TimetableWindow : Window {
 		this->DrawWidgets();
 
 		int y = 15;
-		int i = this->vscroll.pos;
+		int i = this->vscroll.GetPosition();
 		VehicleOrderID order_id = (i + 1) / 2;
 		bool final_order = false;
 
@@ -187,7 +187,7 @@ struct TimetableWindow : Window {
 
 		while (order != NULL) {
 			/* Don't draw anything if it extends past the end of the window. */
-			if (i - this->vscroll.pos >= this->vscroll.cap) break;
+			if (!this->vscroll.IsVisible(i)) break;
 
 			if (i % 2 == 0) {
 				DrawOrderString(v, order, order_id, y, i == selected, true, this->widget[TTV_TIMETABLE_PANEL].right - 4);
@@ -335,7 +335,7 @@ struct TimetableWindow : Window {
 	virtual void OnResize(Point delta)
 	{
 		/* Update the scroll + matrix */
-		this->vscroll.cap = (this->widget[TTV_TIMETABLE_PANEL].bottom - this->widget[TTV_TIMETABLE_PANEL].top) / 10;
+		this->vscroll.UpdateCapacity(delta.y / 10);
 	}
 };