Added mouse wheel support to the world selection screen.

src/client/gui/screens/IngameBlockSelectionScreen.cpp

@@ -202,6 +202,25 @@ void IngameBlockSelectionScreen::keyPressed(int eventKey)
 #endif
 }
 
+//------------------------------------------------------------------------------
+// wheel support for creative inventory; scroll moves selection vertically
+void IngameBlockSelectionScreen::mouseWheel(int dx, int dy, int xm, int ym)
+{
+	if (dy == 0) return;
+	// just move selection up/down one row; desktop UI doesn't have a pane
+	int cols = InventoryCols;
+	int maxIndex = InventorySize - 1;
+	int idx = selectedItem;
+	if (dy > 0) {
+		// wheel up -> previous row
+		if (idx >= cols) idx -= cols;
+	} else {
+		// wheel down -> next row
+		if (idx + cols <= maxIndex) idx += cols;
+	}
+	selectedItem = idx;
+}
+
 int IngameBlockSelectionScreen::getSelectedSlot(int x, int y)
 {
 	int left = width / 2 - InventoryCols * 10;

src/client/gui/screens/IngameBlockSelectionScreen.h

@@ -23,6 +23,9 @@ protected:
 
 	virtual void buttonClicked(Button* button);
 
+	// wheel input for creative inventory scrolling
+	virtual void mouseWheel(int dx, int dy, int xm, int ym) override;
+
 	virtual void keyPressed(int eventKey);
 private:
 	void renderSlots();

src/client/gui/screens/SelectWorldScreen.cpp

@@ -356,7 +356,7 @@ void SelectWorldScreen::render( int xm, int ym, float a )
 	worldsList->setComponentSelected(bWorldView.selected);
 	// #ifdef PLATFORM_DESKTOP
 
-	// We should add scrolling with mouse wheel but currently i dont know how to implement it
+	// desktop: render the list normally (mouse wheel handled separately below)
 	if (_mouseHasBeenUp)
 		worldsList->render(xm, ym, a);
 	else {
@@ -412,6 +412,28 @@ std::string SelectWorldScreen::getUniqueLevelName( const std::string& level )
 
 bool SelectWorldScreen::isInGameScreen() { return true;  }
 
+void SelectWorldScreen::mouseWheel(int dx, int dy, int xm, int ym)
+{
+	if (!worldsList)
+		return;
+	if (dy == 0)
+		return;
+	int num = worldsList->getNumberOfItems();
+	int idx = worldsList->selectedItem;
+	if (dy > 0) {
+		if (idx > 0) {
+			idx--;
+			worldsList->stepLeft();
+		}
+	} else {
+		if (idx < num - 1) {
+			idx++;
+			worldsList->stepRight();
+		}
+	}
+	worldsList->selectedItem = idx;
+}
+
 void SelectWorldScreen::keyPressed( int eventKey )
 {
 	if (bWorldView.selected) {

src/client/gui/screens/SelectWorldScreen.h

@@ -90,6 +90,9 @@ public:
 
 	void render(int xm, int ym, float a);
 
+	// mouse wheel scroll (new in desktop implementation)
+	virtual void mouseWheel(int dx, int dy, int xm, int ym);
+
 	bool isInGameScreen();
 private:
 	void loadLevelSource();

src/client/gui/screens/touch/TouchIngameBlockSelectionScreen.cpp

@@ -153,6 +153,11 @@ int IngameBlockSelectionScreen::getSlotPosY(int slotY) {
 	return height - 16 - 3 - 22 * 2 - 22 * slotY;
 }
 
+int IngameBlockSelectionScreen::getSlotHeight() {
+	// same as non-touch implementation
+	return 22;
+}
+
 void IngameBlockSelectionScreen::mouseClicked(int x, int y, int buttonNum) {
 	_pendingClose = _blockList->_clickArea->isInside((float)x, (float)y);
 	if (!_pendingClose)
@@ -166,6 +171,24 @@ void IngameBlockSelectionScreen::mouseReleased(int x, int y, int buttonNum) {
 		super::mouseReleased(x, y, buttonNum);
 }
 
+void IngameBlockSelectionScreen::mouseWheel(int dx, int dy, int xm, int ym)
+{
+	if (dy == 0) return;
+	if (_blockList) {
+		float amount = -dy * getSlotHeight();
+		_blockList->scrollBy(0, amount);
+	}
+	int cols = InventoryColumns;
+	int maxIndex = InventorySize - 1;
+	int idx = selectedItem;
+	if (dy > 0) {
+		if (idx >= cols) idx -= cols;
+	} else {
+		if (idx + cols <= maxIndex) idx += cols;
+	}
+	selectedItem = idx;
+}
+
 bool IngameBlockSelectionScreen::addItem(const InventoryPane* pane, int itemId)
 {
 	Inventory* inventory = minecraft->player->inventory;

src/client/gui/screens/touch/TouchIngameBlockSelectionScreen.h

@@ -39,12 +39,16 @@ public:
 protected:
 	virtual void mouseClicked(int x, int y, int buttonNum);
 	virtual void mouseReleased(int x, int y, int buttonNum);
+
+	// also support wheel scrolling
+	virtual void mouseWheel(int dx, int dy, int xm, int ym) override;
 private:
 	void renderDemoOverlay();
 
 	//int getLinearSlotId(int x, int y);
 	int getSlotPosX(int slotX);
 	int getSlotPosY(int slotY);
+	int getSlotHeight();
 
 private:
 	int selectedItem;

src/client/gui/screens/touch/TouchSelectWorldScreen.cpp

@@ -389,6 +389,26 @@ static char ILLEGAL_FILE_CHARACTERS[] = {
 	'/', '\n', '\r', '\t', '\0', '\f', '`', '?', '*', '\\', '<', '>', '|', '\"', ':'
 };
 
+void SelectWorldScreen::mouseWheel(int dx, int dy, int xm, int ym)
+{
+	if (!worldsList) return;
+	if (dy == 0) return;
+	int num = worldsList->getNumberOfItems();
+	int idx = worldsList->selectedItem;
+	if (dy > 0) {
+		if (idx > 0) {
+			idx--;
+			worldsList->stepLeft();
+		}
+	} else {
+		if (idx < num - 1) {
+			idx++;
+			worldsList->stepRight();
+		}
+	}
+	worldsList->selectedItem = idx;
+}
+
 void SelectWorldScreen::tick()
 {
 #if 0

src/client/gui/screens/touch/TouchSelectWorldScreen.h

@@ -97,6 +97,9 @@ public:
 	virtual void buttonClicked(Button* button);
 	virtual void keyPressed(int eventKey);
 
+	// support for mouse wheel when desktop code uses touch variant
+	virtual void mouseWheel(int dx, int dy, int xm, int ym) override;
+
 	bool isInGameScreen();
 private:
 	void loadLevelSource();