Merge pull request #8096 from Robyt3/UI-ScrollRegion-Popup-Handling

Support overlapping scroll regions, always allow mouse scrolling

src/game/client/lineinput.h

@@ -15,7 +15,7 @@
 enum class EInputPriority
 {
 	NONE = 0,
-	Ui,
+	UI,
 	CHAT,
 	CONSOLE,
 };

src/game/client/ui.cpp

@@ -113,11 +113,6 @@ CUi::CUi()
 {
 	m_Enabled = true;
 
-	m_pHotItem = nullptr;
-	m_pActiveItem = nullptr;
-	m_pLastActiveItem = nullptr;
-	m_pBecomingHotItem = nullptr;
-
 	m_MouseX = 0;
 	m_MouseY = 0;
 	m_MouseWorldX = 0;
@@ -220,6 +215,8 @@ void CUi::Update(float MouseX, float MouseY, float MouseDeltaX, float MouseDelta
 	if(m_pActiveItem)
 		m_pHotItem = m_pActiveItem;
 	m_pBecomingHotItem = nullptr;
+	m_pHotScrollRegion = m_pBecomingHotScrollRegion;
+	m_pBecomingHotScrollRegion = nullptr;
 
 	if(Enabled())
 	{
@@ -231,6 +228,7 @@ void CUi::Update(float MouseX, float MouseY, float MouseDeltaX, float MouseDelta
 	{
 		m_pHotItem = nullptr;
 		m_pActiveItem = nullptr;
+		m_pHotScrollRegion = nullptr;
 	}
 }
 
@@ -804,7 +802,7 @@ bool CUi::DoEditBox(CLineInput *pLineInput, const CUIRect *pRect, float FontSize
 		SetHotItem(pLineInput);
 
 	if(Enabled() && Active && !JustGotActive)
-		pLineInput->Activate(EInputPriority::Ui);
+		pLineInput->Activate(EInputPriority::UI);
 	else
 		pLineInput->Deactivate();
 
@@ -1416,7 +1414,10 @@ void CUi::RenderPopupMenus()
 		const bool Active = i == m_vPopupMenus.size() - 1;
 
 		if(Active)
+		{
+			// Prevent UI elements below the popup menu from being activated.
 			SetHotItem(pId);
+		}
 
 		if(CheckActiveItem(pId))
 		{
@@ -1437,6 +1438,12 @@ void CUi::RenderPopupMenus()
 				SetActiveItem(pId);
 		}
 
+		if(Inside)
+		{
+			// Prevent scroll regions directly behind popup menus from using the mouse scroll events.
+			SetHotScrollRegion(nullptr);
+		}
+
 		CUIRect PopupRect = PopupMenu.m_Rect;
 		PopupRect.Draw(PopupMenu.m_Props.m_BorderColor, PopupMenu.m_Props.m_Corners, 3.0f);
 		PopupRect.Margin(SPopupMenu::POPUP_BORDER, &PopupRect);

src/game/client/ui.h

@@ -14,6 +14,7 @@
 #include <string>
 #include <vector>
 
+class CScrollRegion;
 class IClient;
 class IGraphics;
 class IKernel;
@@ -322,10 +323,12 @@ public:
 private:
 	bool m_Enabled;
 
-	const void *m_pHotItem;
-	const void *m_pActiveItem;
-	const void *m_pLastActiveItem; // only used internally to track active CLineInput
-	const void *m_pBecomingHotItem;
+	const void *m_pHotItem = nullptr;
+	const void *m_pActiveItem = nullptr;
+	const void *m_pLastActiveItem = nullptr; // only used internally to track active CLineInput
+	const void *m_pBecomingHotItem = nullptr;
+	const CScrollRegion *m_pHotScrollRegion = nullptr;
+	const CScrollRegion *m_pBecomingHotScrollRegion = nullptr;
 	bool m_ActiveItemValid = false;
 
 	vec2 m_UpdatedMousePos = vec2(0.0f, 0.0f);
@@ -464,9 +467,11 @@ public:
 		}
 		return false;
 	}
+	void SetHotScrollRegion(const CScrollRegion *pId) { m_pBecomingHotScrollRegion = pId; }
 	const void *HotItem() const { return m_pHotItem; }
 	const void *NextHotItem() const { return m_pBecomingHotItem; }
 	const void *ActiveItem() const { return m_pActiveItem; }
+	const CScrollRegion *HotScrollRegion() const { return m_pHotScrollRegion; }
 
 	void StartCheck() { m_ActiveItemValid = false; }
 	void FinishCheck()
@@ -629,7 +634,7 @@ public:
 	struct SSelectionPopupContext : public SPopupMenuId
 	{
 		CUi *m_pUI; // set by CUi when popup is shown
-		class CScrollRegion *m_pScrollRegion;
+		CScrollRegion *m_pScrollRegion;
 		SPopupMenuProperties m_Props;
 		char m_aMessage[256];
 		std::vector<std::string> m_vEntries;

src/game/client/ui_listbox.cpp

@@ -117,7 +117,6 @@ void CListBox::DoStart(float RowHeight, int NumItems, int ItemsPerRow, int RowsP
 	// setup the scrollbar
 	m_ScrollOffset = vec2(0.0f, 0.0f);
 	CScrollRegionParams ScrollParams;
-	ScrollParams.m_Active = m_Active;
 	ScrollParams.m_ScrollbarWidth = ScrollbarWidthMax();
 	ScrollParams.m_ScrollbarMargin = ScrollbarMargin();
 	ScrollParams.m_ScrollUnit = (m_ListBoxRowHeight + m_AutoSpacing) * RowsPerScroll;
@@ -208,7 +207,7 @@ CListboxItem CListBox::DoSubheader()
 int CListBox::DoEnd()
 {
 	m_ScrollRegion.End();
-	m_Active |= m_ScrollRegion.Params().m_Active;
+	m_Active |= m_ScrollRegion.Active();
 
 	m_ScrollbarShown = m_ScrollRegion.ScrollbarShown();
 	if(m_ListBoxNewSelOffset != 0 && m_ListBoxNumItems > 0 && m_ListBoxSelectedIndex == m_ListBoxNewSelected)

src/game/client/ui_scrollregion.cpp

@@ -79,7 +79,7 @@ void CScrollRegion::End()
 	CUIRect RegionRect = m_ClipRect;
 	RegionRect.w += m_Params.m_ScrollbarWidth;
 
-	if(m_ScrollDirection != SCROLLRELATIVE_NONE || (Ui()->Enabled() && m_Params.m_Active && Ui()->MouseHovered(&RegionRect)))
+	if(m_ScrollDirection != SCROLLRELATIVE_NONE || Ui()->HotScrollRegion() == this)
 	{
 		bool ProgrammaticScroll = false;
 		if(Ui()->ConsumeHotkey(CUi::HOTKEY_SCROLL_UP))
@@ -106,6 +106,11 @@ void CScrollRegion::End()
 		}
 	}
 
+	if(Ui()->Enabled() && Ui()->MouseHovered(&RegionRect))
+	{
+		Ui()->SetHotScrollRegion(this);
+	}
+
 	const float SliderHeight = maximum(m_Params.m_SliderMinHeight, m_ClipRect.h / m_ContentH * m_RailRect.h);
 
 	CUIRect Slider = m_RailRect;
@@ -163,7 +168,6 @@ void CScrollRegion::End()
 			m_SliderGrabPos = Ui()->MouseY() - Slider.y;
 			m_AnimTargetScrollY = m_ScrollY;
 			m_AnimTime = 0.0f;
-			m_Params.m_Active = true;
 		}
 	}
 	else if(InsideRail && Ui()->MouseButtonClicked(0))
@@ -174,7 +178,6 @@ void CScrollRegion::End()
 		m_SliderGrabPos = Slider.h / 2.0f;
 		m_AnimTargetScrollY = m_ScrollY;
 		m_AnimTime = 0.0f;
-		m_Params.m_Active = true;
 	}
 	else if(Ui()->CheckActiveItem(pId) && !Ui()->MouseButton(0))
 	{
@@ -259,3 +262,8 @@ bool CScrollRegion::Animating() const
 {
 	return m_AnimTime > 0.0f;
 }
+
+bool CScrollRegion::Active() const
+{
+	return Ui()->ActiveItem() == &m_ScrollY;
+}

src/game/client/ui_scrollregion.h

@@ -7,7 +7,6 @@
 
 struct CScrollRegionParams
 {
-	bool m_Active;
 	float m_ScrollbarWidth;
 	float m_ScrollbarMargin;
 	bool m_ScrollbarNoMarginRight;
@@ -28,7 +27,6 @@ struct CScrollRegionParams
 
 	CScrollRegionParams()
 	{
-		m_Active = true;
 		m_ScrollbarWidth = 20.0f;
 		m_ScrollbarMargin = 5.0f;
 		m_ScrollbarNoMarginRight = false;
@@ -140,6 +138,7 @@ public:
 	bool RectClipped(const CUIRect &Rect) const;
 	bool ScrollbarShown() const;
 	bool Animating() const;
+	bool Active() const;
 	const CScrollRegionParams &Params() const { return m_Params; }
 };