devilutionX/SourceX/DiabloUI/diabloui.cpp

#include "devilution.h"
#include "miniwin/ddraw.h"
#include "stubs.h"
#include "utf8.h"
#include <string>
#include <algorithm>

#include "DiabloUI/scrollbar.h"
#include "DiabloUI/diabloui.h"

#include "DiabloUI/art_draw.h"
#include "DiabloUI/text_draw.h"
#include "DiabloUI/fonts.h"
#include "DiabloUI/button.h"
#include "DiabloUI/dialogs.h"

namespace dvl {

int SelectedItemMin = 1;
int SelectedItemMax = 1;

std::size_t ListViewportSize = 1;
const std::size_t *ListOffset = nullptr;

Art ArtLogos[3];
Art ArtFocus[3];
Art ArtBackground;
Art ArtCursor;
Art ArtHero;
bool gbSpawned;

void (*gfnSoundFunction)(char *file);
void (*gfnListFocus)(int value);
void (*gfnListSelect)(int value);
void (*gfnListEsc)();
bool (*gfnListYesNo)();
UiItem *gUiItems;
int gUiItemCnt;
bool UiItemsWraps;
char *UiTextInput;
int UiTextInputLen;


namespace {

int fadeValue = 0;
int SelectedItem = 0;

struct {
	bool upArrowPressed = false;
	bool downArrowPressed = false;
} scrollBarState;

const char *const errorTitle[] = {
	"SDL Error",
	"Out of Memory Error",
	"SDL Error",
	"Data File Error",
	"SDL Error",
	"Out of Disk Space",
	"SDL Error",
	"Data File Error",
	"Windows 2000 Restricted User Advisory",
	"Read-Only Directory Error",
};
const char *const errorMessages[] = {
	"Diablo was unable to properly initialize SDL.\nPlease try the following solutions to correct the problem:\n\n    Install the most recent SDL provided for your distribution.\n\nIf you continue to have problems with SDL, create an issue on GitHub:\n    https://github.com/diasurgical/devilutionX/issues\n\n\nThe error encountered while trying to initialize was:\n\n    %s",
	"Diablo has exhausted all the memory on your system.\nMake sure you have at least 512MB of free system memory\n\nThe error encountered was:\n\n    %s",
	"Diablo was unable to open a required file.\nPlease ensure that the diabdat.mpq is in the same folder as Devilution.\nIf this problem persists, try checking that the md5 of diabdat.mpq is either 011bc6518e6166206231080a4440b373 or 68f049866b44688a7af65ba766bef75a.\n\nThe problem occurred while trying to load %s",
	"Diablo was unable to find the file \"ddraw.dll\", which is a component of Microsoft DirectX.\nPlease run the program \"SETUP.EXE\" on the Diablo CD-ROM and install Microsoft DirectX.\n\nIf you continue to have problems with DirectX, please contact Microsoft's Technical Support at:\n\n    USA telephone: 1-800-426-9400\n    International telephone: 206-882-8080\n    http://www.microsoft.com\n\n\nThe error encountered while trying to initialize DirectX was:\n\n    %s",
	"Diablo was unable to find the file \"dsound.dll\", which is a component of Microsoft DirectX.\nPlease run the program \"SETUP.EXE\" on the Diablo CD-ROM and install Microsoft DirectX.\n\nIf you continue to have problems with DirectX, please contact Microsoft's Technical Support at:\n\n    USA telephone: 1-800-426-9400\n    International telephone: 206-882-8080\n    http://www.microsoft.com\n\n\nThe error encountered while trying to initialize DirectX was:\n\n    %s",
	"Diablo requires at least 10 megabytes of free disk space to run properly.\nThe disk:\n\n%s\n\nhas less than 10 megabytes of free space left.\n\nPlease free some space on your drive and run Diablo again.",
	"Diablo was unable to switch video modes.\nThis is a common problem for computers with more than one video card.\nTo correct this problem, please set your video resolution to 640 x 480 and try running Diablo again.\n\nFor Windows 95 and Windows NT\n    Select \"Settings - Control Panel\" from the \"Start\" menu\n    Run the \"Display\" control panel applet\n    Select the \"Settings\" tab\n    Set the \"Desktop Area\" to \"640 x 480 pixels\"\n\n\nThe error encountered while trying to switch video modes was:\n\n    %s",
	"Diablo cannot read a required data file.\nYour diabdat.mpq may not be in the Devilution folder.\nPlease ensure that the filename is in all lower case and try again.\n    %s",
	"In order to install, play or patch Diablo using the Windows 2000 operating system,\nyou will need to log in as either an Administrator or as a Power User.\n\nUsers, also known as Restricted Users, do not have sufficient access to install or play the game properly.\n\nIf you have further questions regarding User Rights in Windows 2000, please refer to your Windows 2000 documentation or contact your system administrator.",
	"Diablo is being run from:\n\n    %s\n\n\nDiablo or the current user does not seem to have write privilages in this directory. Contact your system administrator.\n\nNote that Windows 2000 Restricted Users can not write to the Windows or Program Files directory hierarchies.",
};

} // namespace

DWORD FormatMessage(
    DWORD dwFlags,
    LPCVOID lpSource,
    DWORD dwMessageId,
    DWORD dwLanguageId,
    char *lpBuffer,
    DWORD nSize,
    va_list *Arguments)
{
	DUMMY();
	return 0;
}

LPCSTR DVL_MAKEINTRESOURCE(int i)
{
	switch (i) {
	case IDD_DIALOG1:
		return (LPCSTR)0;
	case IDD_DIALOG2:
		return (LPCSTR)1;
	case IDD_DIALOG3:
		return (LPCSTR)2;
	case IDD_DIALOG4:
		return (LPCSTR)3;
	case IDD_DIALOG5:
		return (LPCSTR)4;
	case IDD_DIALOG7:
		return (LPCSTR)5;
	case IDD_DIALOG8:
		return (LPCSTR)6;
	case IDD_DIALOG9:
		return (LPCSTR)7;
	case IDD_DIALOG10:
		return (LPCSTR)8;
	case IDD_DIALOG11:
		return (LPCSTR)9;
	}

	return (LPCSTR)-1;
}

int DialogBoxParam(HINSTANCE hInstance, LPCSTR msgId, HWND hWndParent, DLGPROC lpDialogFunc, LPARAM dwInitParam)
{
	char text[1024];
	snprintf(text, 1024, errorMessages[(intptr_t)msgId], dwInitParam);
	UiErrorOkDialog(errorTitle[(intptr_t)msgId], text, nullptr, 0);
	return 0;
}

BOOL SetDlgItemText(HWND hDlg, int nIDDlgItem, LPCSTR lpString)
{
	return false;
}

BOOL EndDialog(HWND hDlg, INT_PTR nResult)
{
	return false;
}

BOOL SetWindowPos(HWND hWnd, HWND hWndInsertAfter, int X, int Y, int cx, int cy, UINT uFlags)
{
	SDL_SetWindowPosition(window, X, Y);

	return true;
}

void UiDestroy()
{
	DUMMY();
	ArtHero.Unload();
	UnloadTtfFont();
}

void UiInitList(int min, int max, void (*fnFocus)(int value), void (*fnSelect)(int value), void (*fnEsc)(), UiItem *items, int itemCnt, bool itemsWraps, bool (*fnYesNo)())
{
	SelectedItem = min;
	SelectedItemMin = min;
	SelectedItemMax = max;
	ListViewportSize = SelectedItemMax - SelectedItemMin + 1;
	gfnListFocus = fnFocus;
	gfnListSelect = fnSelect;
	gfnListEsc = fnEsc;
	gfnListYesNo = fnYesNo;
	gUiItems = items;
	gUiItemCnt = itemCnt;
	UiItemsWraps = itemsWraps;
	if (fnFocus)
		fnFocus(min);

	SDL_StopTextInput(); // input is enabled by default
	for (int i = 0; i < itemCnt; i++) {
		if (items[i].type == UI_EDIT) {
			SDL_StartTextInput();
			UiTextInput = items[i].edit.value;
			UiTextInputLen = items[i].edit.max_length;
		}
	}
}

void UiInitScrollBar(UiScrollBar *ui_sb, std::size_t viewport_size, const std::size_t *current_offset) {
	ListViewportSize = viewport_size;
	ListOffset = current_offset;
	if (ListViewportSize >= static_cast<std::size_t>(SelectedItemMax - SelectedItemMin + 1)) {
		ui_sb->add_flag(UIS_HIDDEN);
	} else {
		ui_sb->remove_flag(UIS_HIDDEN);
	}
}

void UiPlayMoveSound()
{
	if (gfnSoundFunction)
		gfnSoundFunction("sfx\\items\\titlemov.wav");
}

void UiPlaySelectSound()
{
	if (gfnSoundFunction)
		gfnSoundFunction("sfx\\items\\titlslct.wav");
}

void UiFocus(int itemIndex, bool wrap = false)
{
	if (!wrap) {
		if (itemIndex < SelectedItemMin) {
			itemIndex = SelectedItemMin;
			return;
		} else if (itemIndex > SelectedItemMax) {
			itemIndex = SelectedItemMax ? SelectedItemMax : SelectedItemMin;
			return;
		}
	} else if (itemIndex < SelectedItemMin) {
		itemIndex = SelectedItemMax ? SelectedItemMax : SelectedItemMin;
	} else if (itemIndex > SelectedItemMax) {
		itemIndex = SelectedItemMin;
	}

	if (SelectedItem == itemIndex)
		return;

	SelectedItem = itemIndex;

	UiPlayMoveSound();

	if (gfnListFocus)
		gfnListFocus(itemIndex);
}

// UiFocusPageUp/Down mimics the slightly weird behaviour of actual Diablo.

void UiFocusPageUp()
{
	if (ListOffset == nullptr || *ListOffset == 0) {
		UiFocus(SelectedItemMin);
	} else {
		const std::size_t relpos = (SelectedItem - SelectedItemMin) - *ListOffset;
		std::size_t prev_page_start = SelectedItem - relpos;
		if (prev_page_start >= ListViewportSize)
			prev_page_start -= ListViewportSize;
		else
			prev_page_start = 0;
		UiFocus(prev_page_start);
		UiFocus(*ListOffset + relpos);
	}
}

void UiFocusPageDown()
{
	if (ListOffset == nullptr || *ListOffset + ListViewportSize > static_cast<std::size_t>(SelectedItemMax)) {
		UiFocus(SelectedItemMax);
	} else {
		const std::size_t relpos = (SelectedItem - SelectedItemMin) - *ListOffset;
		std::size_t next_page_end = SelectedItem + (ListViewportSize - relpos - 1);
		if (next_page_end + ListViewportSize <= static_cast<std::size_t>(SelectedItemMax))
			next_page_end += ListViewportSize;
		else
			next_page_end = SelectedItemMax;
		UiFocus(next_page_end);
		UiFocus(*ListOffset + relpos);
	}
}

void selhero_CatToName(char *in_buf, char *out_buf, int cnt)
{
	std::string output = utf8_to_latin1(in_buf);
	output.resize(SDL_TEXTINPUTEVENT_TEXT_SIZE - 1);
	strncat(out_buf, output.c_str(), cnt - strlen(out_buf));
}

bool UiFocusNavigation(SDL_Event *event)
{
	if (event->type == SDL_QUIT)
		exit(0);

	switch (event->type) {
	case SDL_KEYUP:
	case SDL_MOUSEBUTTONUP:
	case SDL_MOUSEMOTION:
#ifndef USE_SDL1
	case SDL_MOUSEWHEEL:
#endif
	case SDL_JOYBUTTONUP:
	case SDL_JOYAXISMOTION:
	case SDL_JOYBALLMOTION:
	case SDL_JOYHATMOTION:
#ifndef USE_SDL1
	case SDL_FINGERUP:
	case SDL_FINGERMOTION:
	case SDL_CONTROLLERBUTTONUP:
	case SDL_CONTROLLERAXISMOTION:
	case SDL_WINDOWEVENT:
#endif
	case SDL_SYSWMEVENT:
		mainmenu_restart_repintro();
	}

	if (event->type == SDL_KEYDOWN) {
		switch (event->key.keysym.sym) {
		case SDLK_UP:
			UiFocus(SelectedItem - 1, UiItemsWraps);
			return true;
		case SDLK_DOWN:
			UiFocus(SelectedItem + 1, UiItemsWraps);
			return true;
		case SDLK_TAB:
			if (SDL_GetModState() & KMOD_SHIFT)
				UiFocus(SelectedItem - 1, UiItemsWraps);
			else
				UiFocus(SelectedItem + 1, UiItemsWraps);
			return true;
		case SDLK_PAGEUP:
			UiFocusPageUp();
			return true;
		case SDLK_PAGEDOWN:
			UiFocusPageDown();
			return true;
		case SDLK_RETURN:
		case SDLK_KP_ENTER:
		case SDLK_SPACE:
			UiFocusNavigationSelect();
			return true;
		case SDLK_DELETE:
			UiFocusNavigationYesNo();
			return true;
		default:
			break;
		}
	}

	if (SDL_IsTextInputActive()) {
		switch (event->type) {
		case SDL_KEYDOWN: {
			switch (event->key.keysym.sym) {
#ifndef USE_SDL1
			case SDLK_v:
				if (SDL_GetModState() & KMOD_CTRL) {
					char *clipboard = SDL_GetClipboardText();
					if (clipboard == NULL) {
						SDL_Log(SDL_GetError());
					}
					selhero_CatToName(clipboard, UiTextInput, UiTextInputLen);
				}
				return true;
#endif
			case SDLK_BACKSPACE:
			case SDLK_LEFT: {
				int nameLen = strlen(UiTextInput);
				if (nameLen > 0) {
					UiTextInput[nameLen - 1] = '\0';
				}
				return true;
			}
			default:
				break;
			}
#ifdef USE_SDL1
			if ((event->key.keysym.mod & KMOD_CTRL) == 0) {
				Uint16 unicode = event->key.keysym.unicode;
				if (unicode && (unicode & 0xFF80) == 0) {
					char utf8[SDL_TEXTINPUTEVENT_TEXT_SIZE];
					utf8[0] = (char)unicode;
					utf8[1] = '\0';
					selhero_CatToName(utf8, UiTextInput, UiTextInputLen);
				}
			}
#endif
			break;
		}
#ifndef USE_SDL1
		case SDL_TEXTINPUT:
			selhero_CatToName(event->text.text, UiTextInput, UiTextInputLen);
			return true;
#endif
		default:
			break;
		}
	}

	if (UiItemMouseEvents(event, gUiItems, gUiItemCnt))
		return true;

	if (gfnListEsc && event->type == SDL_KEYDOWN && event->key.keysym.sym == SDLK_ESCAPE) {
		UiFocusNavigationEsc();
		return true;
	}

	return false;
}

void UiFocusNavigationSelect()
{
	UiPlaySelectSound();
	if (SDL_IsTextInputActive()) {
		if (strlen(UiTextInput) == 0) {
			return;
		}
		SDL_StopTextInput();
		UiTextInput = NULL;
		UiTextInputLen = 0;
	}
	if (gfnListSelect)
		gfnListSelect(SelectedItem);
}

void UiFocusNavigationEsc()
{
	UiPlaySelectSound();
	if (SDL_IsTextInputActive()) {
		SDL_StopTextInput();
		UiTextInput = NULL;
		UiTextInputLen = 0;
	}
	if (gfnListEsc)
		gfnListEsc();
}

void UiFocusNavigationYesNo()
{
	if (gfnListYesNo == NULL)
		return;

	if (gfnListYesNo())
		UiPlaySelectSound();
}

bool IsInsideRect(const SDL_Event &event, const SDL_Rect &rect)
{
	const SDL_Point point = { event.button.x, event.button.y };
	return SDL_PointInRect(&point, &rect);
}

void LoadUiGFX() {
	LoadMaskedArt("ui_art\\smlogo.pcx", &ArtLogos[LOGO_MED], 15);
	LoadMaskedArt("ui_art\\focus16.pcx", &ArtFocus[FOCUS_SMALL], 8);
	LoadMaskedArt("ui_art\\focus.pcx", &ArtFocus[FOCUS_MED], 8);
	LoadMaskedArt("ui_art\\focus42.pcx", &ArtFocus[FOCUS_BIG], 8);
	LoadMaskedArt("ui_art\\cursor.pcx", &ArtCursor, 1, 0);
	LoadArt("ui_art\\heros.pcx", &ArtHero, 4);
}

void UiInitialize()
{
	LoadUiGFX();
	LoadArtFonts();
	ShowCursor(false);
}

int UiProfileGetString()
{
	DUMMY();
	return 0;
}

char connect_plrinfostr[128];
char connect_categorystr[128];
void UiSetupPlayerInfo(char *infostr, _uiheroinfo *pInfo, DWORD type)
{
	DUMMY();
	SStrCopy(connect_plrinfostr, infostr, 128);
	char format[32] = "";
	strncpy(format, (char *)&type, 4);
	strcat(format, " %d %d %d %d %d %d %d %d %d");

	snprintf(
	    connect_categorystr,
	    128,
	    format,
	    pInfo->level,
	    pInfo->heroclass,
	    pInfo->herorank,
	    pInfo->strength,
	    pInfo->magic,
	    pInfo->dexterity,
	    pInfo->vitality,
	    pInfo->gold,
	    pInfo->spawned);
}

void UiAppActivate(BOOL bActive)
{
	DUMMY();
}

BOOL UiValidPlayerName(char *name)
{
	if (!strlen(name))
		return false;

	if (strpbrk(name, ",<>%&\\\"?*#/:") || strpbrk(name, " "))
		return false;

	for (BYTE *letter = (BYTE *)name; *letter; letter++)
		if (*letter < 0x20 || (*letter > 0x7E && *letter < 0xC0))
			return false;

	return true;
}

void UiProfileCallback()
{
	UNIMPLEMENTED();
}

void UiProfileDraw()
{
	UNIMPLEMENTED();
}

BOOL UiCategoryCallback(int a1, int a2, int a3, int a4, int a5, DWORD *a6, DWORD *a7)
{
	UNIMPLEMENTED();
}

BOOL UiGetDataCallback(int game_type, int data_code, void *a3, int a4, int a5)
{
	UNIMPLEMENTED();
}

BOOL UiAuthCallback(int a1, char *a2, char *a3, char a4, char *a5, LPSTR lpBuffer, int cchBufferMax)
{
	UNIMPLEMENTED();
}

BOOL UiSoundCallback(int a1, int type, int a3)
{
	UNIMPLEMENTED();
}

void UiMessageBoxCallback(HWND hWnd, char *lpText, LPCSTR lpCaption, UINT uType)
{
	UNIMPLEMENTED();
}

BOOL UiDrawDescCallback(int game_type, COLORREF color, LPCSTR lpString, char *a4, int a5, UINT align, time_t a7,
    HDC *a8)
{
	UNIMPLEMENTED();
}

BOOL UiCreateGameCallback(int a1, int a2, int a3, int a4, int a5, int a6)
{
	UNIMPLEMENTED();
}

BOOL UiArtCallback(int game_type, unsigned int art_code, PALETTEENTRY *pPalette, BYTE *pBuffer,
    DWORD dwBuffersize, DWORD *pdwWidth, DWORD *pdwHeight, DWORD *pdwBpp)
{
	UNIMPLEMENTED();
}

BOOL UiCreatePlayerDescription(_uiheroinfo *info, DWORD mode, char *desc)
{
	char format[32] = "";
	strncpy(format, (char *)&mode, 4);
	strcat(format, " %d %d %d %d %d %d %d %d %d");

	snprintf(
	    desc,
	    128,
	    format,
	    info->level,
	    info->heroclass,
	    info->herorank,
	    info->strength,
	    info->magic,
	    info->dexterity,
	    info->vitality,
	    info->gold,
	    info->spawned);

	return true;
}

int GetCenterOffset(int w, int bw)
{
	if (bw == 0) {
		bw = SCREEN_WIDTH;
	}

	return (bw - w) / 2;
}

void LoadBackgroundArt(char *pszFile)
{
	PALETTEENTRY pPal[256];

	fadeValue = 0;
	LoadArt(pszFile, &ArtBackground, 1, pPal);
	if (ArtBackground.surface == nullptr)
		return;

	LoadPalInMem(pPal);
	ApplyGamma(logical_palette, orig_palette, 256);
}

void UiFadeIn(int steps)
{
	if (fadeValue < 256) {
		fadeValue += steps;
		if (fadeValue > 256) {
			fadeValue = 256;
		}
	}

	SetFadeLevel(fadeValue);
}

void DrawSelector(const SDL_Rect &rect)
{
	int size = FOCUS_SMALL;
	if (rect.h >= 42)
		size = FOCUS_BIG;
	else if (rect.h >= 30)
		size = FOCUS_MED;
	Art *art = &ArtFocus[size];

	int frame = GetAnimationFrame(art->frames);
	int y = rect.y + (rect.h - art->h()) / 2; // TODO FOCUS_MED appares higher then the box

	DrawArt(rect.x, y, art, frame);
	DrawArt(rect.x + rect.w - art->w(), y, art, frame);
}

void UiPollAndRender() {
	SDL_Event event;
	while (SDL_PollEvent(&event)) {
		UiFocusNavigation(&event);
	}
	UiRenderItems(gUiItems, gUiItemCnt);
	DrawMouse();
	UiFadeIn();
}

namespace {

void Render(UiText *ui_text)
{
	DrawTTF(ui_text->text,
	    ui_text->rect,
	    ui_text->flags,
	    ui_text->color,
	    ui_text->shadow_color,
	    &ui_text->render_cache);
}

void Render(const UiArtText &ui_art_text)
{
	DrawArtStr(ui_art_text.text, ui_art_text.rect, ui_art_text.flags);
}

void Render(const UiImage &ui_image)
{
	int x = ui_image.rect.x;
	if ((ui_image.flags & UIS_CENTER) && ui_image.art != nullptr) {
		const int x_offset = GetCenterOffset(ui_image.art->w(), ui_image.rect.w);
		x += x_offset;
	}
	if (ui_image.animated) {
		DrawAnimatedArt(ui_image.art, x, ui_image.rect.y);
	} else {
		DrawArt(x, ui_image.rect.y, ui_image.art, ui_image.frame, ui_image.rect.w);
	}
}

void Render(const UiArtTextButton &ui_button)
{
	DrawArtStr(ui_button.text, ui_button.rect, ui_button.flags);
}

void Render(const UiList &ui_list)
{
	for (std::size_t i = 0; i < ui_list.length; ++i) {
		SDL_Rect rect = ui_list.itemRect(i);
		const auto &item = ui_list.items[i];
		if (item.value == SelectedItem)
			DrawSelector(rect);
		DrawArtStr(item.text, rect, ui_list.flags);
	}
}

void Render(const UiScrollBar &ui_sb) {
	// Bar background (tiled):
	{
		const std::size_t bg_y_end = DownArrowRect(ui_sb).y;
		std::size_t bg_y = ui_sb.rect.y + ui_sb.arrow->h();
		while (bg_y < bg_y_end) {
			std::size_t drawH = std::min(bg_y + ui_sb.bg->h(), bg_y_end) - bg_y;
			DrawArt(ui_sb.rect.x, bg_y, ui_sb.bg, 0, SCROLLBAR_BG_WIDTH, drawH);
			bg_y += drawH;
		}
	}

	// Arrows:
	{
		const SDL_Rect rect = UpArrowRect(ui_sb);
		const int frame = static_cast<int>(scrollBarState.upArrowPressed ? ScrollBarArrowFrame::UP_ACTIVE : ScrollBarArrowFrame::UP);
		DrawArt(rect.x, rect.y, ui_sb.arrow, frame, rect.w);
	}
	{
		const SDL_Rect rect = DownArrowRect(ui_sb);
		const int frame = static_cast<int>(scrollBarState.downArrowPressed ? ScrollBarArrowFrame::DOWN_ACTIVE : ScrollBarArrowFrame::DOWN);
		DrawArt(rect.x, rect.y, ui_sb.arrow, frame, rect.w);
	}

	// Thumb:
	{
		const SDL_Rect rect = ThumbRect(
			    ui_sb, SelectedItem - SelectedItemMin, SelectedItemMax - SelectedItemMin + 1);
		DrawArt(rect.x, rect.y, ui_sb.thumb);
	}
}

void Render(const UiEdit &ui_edit)
{
	DrawSelector(ui_edit.rect);
	SDL_Rect rect = ui_edit.rect;
	rect.x += 43;
	rect.y += 1;
	rect.w -= 86;
	DrawArtStr(ui_edit.value, rect, ui_edit.flags, /*drawTextCursor=*/true);
}

void RenderItem(UiItem *item)
{
	if (item->has_flag(UIS_HIDDEN))
		return;
	switch (item->type) {
	case UI_TEXT:
		Render(&item->text);
		break;
	case UI_ART_TEXT:
		Render(item->art_text);
		break;
	case UI_IMAGE:
		Render(item->image);
		break;
	case UI_ART_TEXT_BUTTON:
		Render(item->art_text_button);
		break;
	case UI_BUTTON:
		RenderButton(&item->button);
		break;
	case UI_LIST:
		Render(item->list);
		break;
	case UI_SCROLLBAR:
		Render(item->scrollbar);
		break;
	case UI_EDIT:
		Render(item->edit);
		break;
	}
}

bool HandleMouseEventArtTextButton(const SDL_Event &event, const UiArtTextButton &ui_button)
{
	if (event.type != SDL_MOUSEBUTTONDOWN || event.button.button != SDL_BUTTON_LEFT)
		return false;
	ui_button.action();
	return true;
}

bool HandleMouseEventList(const SDL_Event &event, const UiList &ui_list)
{
	if (event.type != SDL_MOUSEBUTTONDOWN || event.button.button != SDL_BUTTON_LEFT)
		return false;
	const UiListItem *list_item = ui_list.itemAt(event.button.y);
	if (gfnListFocus != NULL && SelectedItem != list_item->value) {
		UiFocus(list_item->value);
#ifdef USE_SDL1
	} else if (gfnListFocus == NULL) {
#else
	} else if (gfnListFocus == NULL || event.button.clicks >= 2) {
#endif
		SelectedItem = list_item->value;
		UiFocusNavigationSelect();
	}
	return true;
}

bool HandleMouseEventScrollBar(const SDL_Event &event, const UiScrollBar &ui_sb) {
	if (event.button.button != SDL_BUTTON_LEFT)
		return false;
	if (event.type == SDL_MOUSEBUTTONUP) {
		if (scrollBarState.upArrowPressed && IsInsideRect(event, UpArrowRect(ui_sb))) {
			UiFocus(SelectedItem - 1);
			return true;
		} else if (scrollBarState.downArrowPressed && IsInsideRect(event, DownArrowRect(ui_sb))) {
			UiFocus(SelectedItem + 1);
			return true;
		}
	} else if (event.type == SDL_MOUSEBUTTONDOWN) {
		if (IsInsideRect(event, BarRect(ui_sb))) {
			// Scroll up or down based on thumb position.
			const SDL_Rect thumb_rect = ThumbRect(
			    ui_sb, SelectedItem - SelectedItemMin, SelectedItemMax - SelectedItemMin + 1);
			if (event.button.y < thumb_rect.y) {
				UiFocusPageUp();
			} else if (event.button.y > thumb_rect.y + thumb_rect.h) {
				UiFocusPageDown();
			}
			return true;
		} else if (IsInsideRect(event, UpArrowRect(ui_sb))) {
			scrollBarState.upArrowPressed = true;
			return true;
		} else if (IsInsideRect(event, DownArrowRect(ui_sb))) {
			scrollBarState.downArrowPressed = true;
			return true;
		}
	}
	return false;
}

bool HandleMouseEvent(const SDL_Event &event, UiItem *item)
{
	if (item->has_any_flag(UIS_HIDDEN | UIS_DISABLED) || !IsInsideRect(event, item->rect()))
		return false;
	switch (item->type) {
	case UI_ART_TEXT_BUTTON:
		return HandleMouseEventArtTextButton(event, item->art_text_button);
	case UI_BUTTON:
		return HandleMouseEventButton(event, &item->button);
	case UI_LIST:
		return HandleMouseEventList(event, item->list);
	case UI_SCROLLBAR:
		return HandleMouseEventScrollBar(event, item->scrollbar);
	default:
		return false;
	}
}

} // namespace

void LoadPalInMem(const PALETTEENTRY *pPal)
{
	for (int i = 0; i < 256; i++) {
		orig_palette[i].peFlags = 0;
		orig_palette[i].peRed = pPal[i].peRed;
		orig_palette[i].peGreen = pPal[i].peGreen;
		orig_palette[i].peBlue = pPal[i].peBlue;
	}
}

void UiRenderItems(UiItem *items, std::size_t size)
{
	for (std::size_t i = 0; i < size; i++)
		RenderItem(&items[i]);
}

bool UiItemMouseEvents(SDL_Event *event, UiItem *items, std::size_t size)
{
	if (!items || size == 0) return false;

	bool handled = false;
	for (std::size_t i = 0; i < size; i++) {
		if (HandleMouseEvent(*event, &items[i])) {
			handled = true;
			break;
		}
	}

	if (event->type == SDL_MOUSEBUTTONUP && event->button.button == SDL_BUTTON_LEFT) {
		scrollBarState.downArrowPressed = scrollBarState.upArrowPressed = false;
		for (std::size_t i = 0; i < size; ++i) {
			UiItem &item = items[i];
			if (item.type == UI_BUTTON)
				HandleGlobalMouseUpButton(&item.button);
		}
	}

	return handled;
}

void DrawMouse()
{
	SDL_GetMouseState(&MouseX, &MouseY);

#ifndef USE_SDL1
	if (renderer) {
		float scaleX;
		SDL_RenderGetScale(renderer, &scaleX, NULL);
		MouseX /= scaleX;
		MouseY /= scaleX;

		SDL_Rect view;
		SDL_RenderGetViewport(renderer, &view);
		MouseX -= view.x;
		MouseY -= view.y;
	}
#endif

	DrawArt(MouseX, MouseY, &ArtCursor);
}

/**
 * @brief Get int from ini, if not found the provided value will be added to the ini instead
 */
void DvlIntSetting(const char *valuename, int *value)
{
	if (!SRegLoadValue("devilutionx", valuename, 0, value)) {
		SRegSaveValue("devilutionx", valuename, 0, *value);
	}
}

/**
 * @brief Get string from ini, if not found the provided value will be added to the ini instead
 */
void DvlStringSetting(const char *valuename, char *string, int len)
{
	if (!SRegLoadString("devilutionx", valuename, 0, string, len)) {
		SRegSaveString("devilutionx", valuename, 0, string);
	}
}
}