GUI: Add method to know if a widget contains a given widget

gui/widget.cpp

@@ -175,6 +175,15 @@ Widget *Widget::findWidgetInChain(Widget *w, const char *name) {
 	return 0;
 }
 
+bool Widget::containsWidgetInChain(Widget *w, Widget *search) {
+	while (w) {
+		if (w == search || w->containsWidget(search))
+			return true;
+		w = w->_next;
+	}
+	return false;
+}
+
 void Widget::setEnabled(bool e) {
 	if ((_flags & WIDGET_ENABLED) != e) {
 		if (e)
@@ -837,6 +846,10 @@ ContainerWidget::~ContainerWidget() {
 	}
 }
 
+bool ContainerWidget::containsWidget(Widget *w) const {
+	return containsWidgetInChain(_firstWidget, w);
+}
+
 Widget *ContainerWidget::findWidget(int x, int y) {
 	return findWidgetInChain(_firstWidget, x, y);
 }

gui/widget.h

@@ -107,6 +107,7 @@ private:
 public:
 	static Widget *findWidgetInChain(Widget *start, int x, int y);
 	static Widget *findWidgetInChain(Widget *start, const char *name);
+	static bool containsWidgetInChain(Widget *start, Widget *search);
 
 public:
 	Widget(GuiObject *boss, int x, int y, int w, int h, const char *tooltip = 0);
@@ -158,6 +159,8 @@ public:
 	const Common::String &getTooltip() const { return _tooltip; }
 	void setTooltip(const Common::String &tooltip) { _tooltip = tooltip; }
 
+	virtual bool containsWidget(Widget *) const { return false; }
+
 protected:
 	void updateState(int oldFlags, int newFlags);
 
@@ -388,6 +391,7 @@ public:
 	ContainerWidget(GuiObject *boss, const Common::String &name);
 	~ContainerWidget();
 
+	virtual bool containsWidget(Widget *) const;
 	virtual Widget *findWidget(int x, int y);
 	virtual void removeWidget(Widget *widget);
 protected:

gui/widgets/list.cpp

@@ -101,6 +101,12 @@ ListWidget::~ListWidget() {
 	delete[] _textWidth;
 }
 
+bool ListWidget::containsWidget(Widget *w) const {
+	if (w == _scrollBar || _scrollBar->containsWidget(w))
+		return true;
+	return false;
+}
+
 Widget *ListWidget::findWidget(int x, int y) {
 	if (x >= _w - _scrollBarWidth)
 		return _scrollBar;

gui/widgets/list.h

@@ -89,6 +89,7 @@ public:
 	ListWidget(Dialog *boss, int x, int y, int w, int h, const char *tooltip = 0, uint32 cmd = 0);
 	virtual ~ListWidget();
 
+	virtual bool containsWidget(Widget *) const;
 	virtual Widget *findWidget(int x, int y);
 
 	void setList(const StringArray &list, const ColorList *colors = 0);

gui/widgets/scrollcontainer.cpp

@@ -144,6 +144,12 @@ void ScrollContainerWidget::drawWidget() {
 	g_gui.theme()->drawDialogBackgroundClip(Common::Rect(_x, _y, _x + _w, _y + getHeight() - 1), getBossClipRect(), ThemeEngine::kDialogBackgroundDefault);
 }
 
+bool ScrollContainerWidget::containsWidget(Widget *w) const {
+	if (w == _verticalScroll || _verticalScroll->containsWidget(w))
+		return true;
+	return containsWidgetInChain(_firstWidget, w);
+}
+
 Widget *ScrollContainerWidget::findWidget(int x, int y) {
 	if (_verticalScroll->isVisible() && x >= _w - _verticalScroll->getWidth())
 		return _verticalScroll;

gui/widgets/scrollcontainer.h

@@ -46,6 +46,8 @@ public:
 	virtual void handleCommand(CommandSender *sender, uint32 cmd, uint32 data);
 	virtual void reflowLayout();
 
+	virtual bool containsWidget(Widget *) const;
+
 protected:
 	// We overload getChildY to make sure child widgets are positioned correctly.
 	// Essentially this compensates for the space taken up by the tab title header.

gui/widgets/tab.cpp

@@ -334,6 +334,13 @@ void TabWidget::draw() {
 	}
 }
 
+bool TabWidget::containsWidget(Widget *w) const {
+	if (w == _navLeft || w == _navRight || _navLeft->containsWidget(w) || _navRight->containsWidget(w))
+		return true;
+	return containsWidgetInChain(_firstWidget, w);
+}
+
+
 Widget *TabWidget::findWidget(int x, int y) {
 	if (y < _tabHeight) {
 		if (_navButtonsVisible) {

gui/widgets/tab.h

@@ -107,6 +107,8 @@ public:
 	virtual int getFirstVisible() const;
 	virtual void setFirstVisible(int tabID, bool adjustIfRoom = false);
 
+	virtual bool containsWidget(Widget *) const;
+
 	virtual void reflowLayout();
 
 	virtual void draw();