Some more checks to avoid possible crashes.

gui.cpp

@@ -28,6 +28,7 @@
 #include "screenCommon.hpp"
 
 #include <3ds.h>
+#include <unistd.h>
 
 C3D_RenderTarget* Top;
 C3D_RenderTarget* TopRight;
@@ -39,20 +40,19 @@ std::stack<std::unique_ptr<Screen>> screens;
 bool currentScreen = false;
 
 // Clear Text.
-void Gui::clearTextBufs(void)
-{
-	C2D_TextBufClear(TextBuf);
-}
+void Gui::clearTextBufs(void) { C2D_TextBufClear(TextBuf); }
 
 // Draw a sprite from the sheet.
-void Gui::DrawSprite(C2D_SpriteSheet sheet, size_t imgindex, int x, int y, float ScaleX, float ScaleY)
-{
-	C2D_DrawImageAt(C2D_SpriteSheetGetImage(sheet, imgindex), x, y, 0.5f, nullptr, ScaleX, ScaleY);
+void Gui::DrawSprite(C2D_SpriteSheet sheet, size_t imgindex, int x, int y, float ScaleX, float ScaleY) {
+	if (sheet != nullptr) {
+		if (C2D_SpriteSheetCount(sheet) >= imgindex) {
+			C2D_DrawImageAt(C2D_SpriteSheetGetImage(sheet, imgindex), x, y, 0.5f, nullptr, ScaleX, ScaleY);
+		}
+	}
 }
 
 // Initialize GUI.
-Result Gui::init(void)
-{
+Result Gui::init(void) {
 	C3D_Init(C3D_DEFAULT_CMDBUF_SIZE);
 	C2D_Init(C2D_DEFAULT_MAX_OBJECTS);
 	C2D_Prepare();
@@ -67,43 +67,48 @@ Result Gui::init(void)
 
 // Load a Font.
 Result Gui::loadFont(bool sysFont, const char* Path) {
-	if (sysFont)	Font = C2D_FontLoadSystem(CFG_REGION_USA);
-	else	Font = C2D_FontLoad(Path);
+	if (sysFont) {
+		Font = C2D_FontLoadSystem(CFG_REGION_USA);
+	} else {
+		if (access(Path, F_OK) == 0)	Font = C2D_FontLoad(Path); // Only load if found.
+	}
 	return 0;
 }
 
 // Unload a Font.
 Result Gui::unloadFont() {
-	C2D_FontFree(Font);
+	if (Font != nullptr) {
+		C2D_FontFree(Font); // Make sure to only unload if not nullptr.
+	}
 	return 0;
 }
 
 // Load a Sheet.
 Result Gui::loadSheet(const char* Path, C2D_SpriteSheet &sheet) {
-	sheet	= C2D_SpriteSheetLoad(Path);
+	if (access(Path, F_OK) == 0)	sheet = C2D_SpriteSheetLoad(Path); // Only load if found.
 	return 0;
 }
 
 // Unload a Sheet.
 Result Gui::unloadSheet(C2D_SpriteSheet &sheet) {
-	C2D_SpriteSheetFree(sheet);
+	if (sheet != nullptr)	C2D_SpriteSheetFree(sheet); // Make sure to only unload if not nullptr.
 	return 0;
 }
 
 // Exit the GUI.
-void Gui::exit(void)
-{
+void Gui::exit(void) {
 	C2D_TextBufDelete(TextBuf);
 	C2D_Fini();
 	C3D_Fini();
 }
 
+// Draw a Centered String.
 void Gui::DrawStringCentered(float x, float y, float size, u32 color, std::string Text, int maxWidth, int maxHeight) {
 	float lineHeight, widthScale;
 	lineHeight = Gui::GetStringHeight(size, " ");
 	int line = 0;
 	while(Text.find('\n') != Text.npos) {
-		if(maxWidth == 0) {
+		if (maxWidth == 0) {
 			widthScale = Gui::GetStringWidth(size, Text.substr(0, Text.find('\n')));
 		} else {
 			widthScale = std::min((float)maxWidth, Gui::GetStringWidth(size, Text.substr(0, Text.find('\n'))));
@@ -112,7 +117,7 @@ void Gui::DrawStringCentered(float x, float y, float size, u32 color, std::strin
 		Text = Text.substr(Text.find('\n')+1);
 		line++;
 	}
-	if(maxWidth == 0) {
+	if (maxWidth == 0) {
 		widthScale = Gui::GetStringWidth(size, Text.substr(0, Text.find('\n')));
 	} else {
 		widthScale = std::min((float)maxWidth, Gui::GetStringWidth(size, Text.substr(0, Text.find('\n'))));
@@ -127,20 +132,19 @@ void Gui::DrawString(float x, float y, float size, u32 color, std::string Text,
 	C2D_TextOptimize(&c2d_text);
 
 	float heightScale;
-	if(maxHeight == 0) {
+	if (maxHeight == 0) {
 		heightScale = size;
 	} else {
 		heightScale = std::min(size, size*(maxHeight/Gui::GetStringHeight(size, Text)));
 	}
 
-	if(maxWidth == 0) {
+	if (maxWidth == 0) {
 		C2D_DrawText(&c2d_text, C2D_WithColor, x, y, 0.5f, size, heightScale, color);
 	} else {
 		C2D_DrawText(&c2d_text, C2D_WithColor, x, y, 0.5f, std::min(size, size*(maxWidth/Gui::GetStringWidth(size, Text))), heightScale, color);
 	}
 }
 
-
 // Get String or Text Width.
 float Gui::GetStringWidth(float size, std::string Text) {
 	float width = 0;
@@ -170,31 +174,25 @@ bool Gui::Draw_Rect(float x, float y, float w, float h, u32 color) {
 
 // Mainloop the GUI.
 void Gui::mainLoop(u32 hDown, u32 hHeld, touchPosition touch) {
-	screens.top()->Draw();
-	screens.top()->Logic(hDown, hHeld, touch);
+	if (!screens.empty()) {
+		screens.top()->Draw();
+		screens.top()->Logic(hDown, hHeld, touch);
+	}
 }
 
 // Set the current Screen.
-void Gui::setScreen(std::unique_ptr<Screen> screen)
-{
-	screens.push(std::move(screen));
-}
+void Gui::setScreen(std::unique_ptr<Screen> screen) { screens.push(std::move(screen)); }
 
 // Go a Screen back.
-void Gui::screenBack()
-{
-	screens.pop();
-}
+void Gui::screenBack() { if (screens.size() > 0)	screens.pop(); }
 
 // Select, on which Screen should be drawn.
-void Gui::ScreenDraw(C3D_RenderTarget * screen)
-{
+void Gui::ScreenDraw(C3D_RenderTarget * screen) {
 	C2D_SceneBegin(screen);
 	currentScreen = (screen==Top || screen==TopRight) ? 1 : 0;
 }
 
-void Gui::drawGrid(float xPos, float yPos, float Width, float Height, u32 color)
-{
+void Gui::drawGrid(float xPos, float yPos, float Width, float Height, u32 color) {
 	static constexpr int w	= 1;
 	// BG Color for the Grid. (Transparent.)
 	C2D_DrawRectSolid(xPos, yPos, 0.5, Width, Height, C2D_Color32(0, 0, 0, 0));
@@ -206,24 +204,23 @@ void Gui::drawGrid(float xPos, float yPos, float Width, float Height, u32 color)
 	C2D_DrawRectSolid(xPos, yPos + Height - w, 0.5, Width, w, color);	// bottom
 }
 
-void Gui::drawAnimatedSelector(float xPos, float yPos, float Width, float Height, float speed, u32 SelectorColor, u32 colour)
-{
-	static constexpr int w     = 2;
-	static float timer         = 0.0f;
-	float highlight_multiplier = fmax(0.0, fabs(fmod(timer, 1.0) - 0.5) / 0.5);
-	u8 r                       = SelectorColor & 0xFF;
-	u8 g                       = (SelectorColor >> 8) & 0xFF;
-	u8 b                       = (SelectorColor >> 16) & 0xFF;
-	u32 color = C2D_Color32(r + (255 - r) * highlight_multiplier, g + (255 - g) * highlight_multiplier, b + (255 - b) * highlight_multiplier, 255);
+void Gui::drawAnimatedSelector(float xPos, float yPos, float Width, float Height, float speed, u32 SelectorColor, u32 bgColor) {
+	static constexpr int w		= 2;
+	static float timer			= 0.0f;
+	float highlight_multiplier  = fmax(0.0, fabs(fmod(timer, 1.0) - 0.5) / 0.5);
+	u8 r						= SelectorColor & 0xFF;
+	u8 g						= (SelectorColor >> 8) & 0xFF;
+	u8 b						= (SelectorColor >> 16) & 0xFF;
+	u32 color 					= C2D_Color32(r + (255 - r) * highlight_multiplier, g + (255 - g) * highlight_multiplier, b + (255 - b) * highlight_multiplier, 255);
 
 	// BG Color for the Selector.
-	C2D_DrawRectSolid(xPos, yPos, 0.5, Width, Height, colour);
+	C2D_DrawRectSolid(xPos, yPos, 0.5, Width, Height, bgColor);
 
 	// Animated Selector part.
-	C2D_DrawRectSolid(xPos, yPos, 0.5, Width, w, color);                      // top
-	C2D_DrawRectSolid(xPos, yPos + w, 0.5, w, Height - 2 * w, color);          // left
+	C2D_DrawRectSolid(xPos, yPos, 0.5, Width, w, color); // top
+	C2D_DrawRectSolid(xPos, yPos + w, 0.5, w, Height - 2 * w, color); // left
 	C2D_DrawRectSolid(xPos + Width - w, yPos + w, 0.5, w, Height - 2 * w, color); // right
-	C2D_DrawRectSolid(xPos, yPos + Height - w, 0.5, Width, w, color);             // bottom
+	C2D_DrawRectSolid(xPos, yPos + Height - w, 0.5, Width, w, color); // bottom
 
 	timer += speed; // Speed of the animation. Example : .030f / .030
 }

gui.hpp

@@ -24,8 +24,8 @@
 *         reasonable ways as different from the original version.
 */
 
-#ifndef GUI_HPP
-#define GUI_HPP
+#ifndef _UNIVERSAL_CORE_GUI_HPP
+#define _UNIVERSAL_CORE_GUI_HPP
 
 #include "screen.hpp"
 
@@ -36,65 +36,138 @@
 
 namespace Gui
 {
-	// Clear Text Buffer.
+	// Clear the Text Buffer.
 	void clearTextBufs(void);
 
-	// Draw a sprite from a sheet.
+	/*	Draw a sprite from a SpriteSheet.
+	*	sheet: The SpriteSheet which should be used.
+	*	imgIndex: The index of the sprite from the sheet which should be drawn.
+	*	x: The X Position where the sprite should be drawn.
+	*	y: The Y Position where the sprite should be drawn.
+	*	ScaleX: The X-Scale for the sprite. (Optional!)
+	*	ScaleY: The Y-Scale for the sprite. (Optional!)
+	*/
 	void DrawSprite(C2D_SpriteSheet sheet, size_t imgindex, int x, int y, float ScaleX = 1, float ScaleY = 1);
 
-	// Initialize the GUI with Citro2D & Citro3D and initialize the Textbuffer.
+	// Initialize the GUI with Citro2D & Citro3D and initialize the Textbuffer. (call this when initializing.)
 	Result init(void);
 
-	// Load a Font. (bcfnt)
+	/*	Load a Font. (BCFNT)
+	*	sysFont: Whether the system font should be loaded instead of custom Font.
+	*	Path: Path to the BCFNT file.
+	*	if you're unsure, just call 'Gui::loadFont();' and it will load the system font.
+	*/
 	Result loadFont(bool sysFont = true, const char * Path = "");
 
-	// Unload a Font. (bcfnt)
+	/*	Unload a Font. (BCFNT)
+	*	Only use this if a custom Font has been loaded.
+	*/
 	Result unloadFont();
 
-	// Load a spritesheet.
+	/*	Load a spritesheet.
+	*	Path: Path to the SpriteSheet file. (T3X)
+	*	sheet: Reference to the C2D_SpriteSheet declaration.
+	*/
 	Result loadSheet(const char* Path, C2D_SpriteSheet &sheet);
 
-	// Unload a spritesheet.
+	/*	Unload a spritesheet.
+	*	sheet: Reference to the C2D_SpriteSheet which should be free'd.
+	*/
 	Result unloadSheet(C2D_SpriteSheet &sheet);
 
-	// Exit the GUI.
+	// Exit the GUI. (Call this at exit.)
 	void exit(void);
 	
-	// Draw a centered String.
+	/*	Draws a centered String.
+	*	x: The X Offset from center. (Center: 200 px on top, 160 px on Bottom.)
+	*	y: The Y Position of the Text.
+	*	size: The size of the Text.
+	*	color: The Color of the Text.
+	*	Text: The Text which should be displayed.
+	*	maxWidth: The maxWidth for the Text. (Optional!)
+	*	maxHeight: The maxHeight of the Text. (Optional!)
+	*/
 	void DrawStringCentered(float x, float y, float size, u32 color, std::string Text, int maxWidth = 0, int maxHeight = 0);
 
-	// Draw a String.
+	/*	Draws a String.
+	*	x: The X Position where the Text should be drawn.
+	*	y: The Y Position where the Text should be drawn.
+	*	size: The size of the Text.
+	*	color: The Color of the Text.
+	*	Text: The Text which should be displayed.
+	*	maxWidth: The maxWidth for the Text. (Optional!)
+	*	maxHeight: The maxHeight of the Text. (Optional!)
+	*/
 	void DrawString(float x, float y, float size, u32 color, std::string Text, int maxWidth = 0, int maxHeight = 0);
 
-	// Get the width of a String.
+	/*	Get the width of a String.
+	*	size: The size of the Text.
+	*	Text: The Text where the width should be getted from.
+	*/
 	float GetStringWidth(float size, std::string Text);
 
-	// Get the size of a String.
+	/*	Get the size of a String.
+	*	size: The size of the Text.
+	*	width: The width of the Text.
+	*	height: The height of the Text.
+	*	Text: The Text where the size should be getted from.
+	*/
 	void GetStringSize(float size, float *width, float *height, std::string Text);
 
-	// Get the height of a String.
+	/*	Get the height of a String.
+	*	size: The size of the Text.
+	*	Text: The Text where the height should be getted from.
+	*/
 	float GetStringHeight(float size, std::string Text);
 
-	// Draw a Rectangle.
+	/*	Draw a Rectangle.
+	*	x: X Position of the Rectangle.
+	*	y: Y Position of the Rectangle.
+	*	w: The width of the rectangle.
+	*	h: The height of the rectangle.
+	*	color: The color of the rectangle.
+	*/
 	bool Draw_Rect(float x, float y, float w, float h, u32 color);
 	
-	// Mainloop the GUI / Screen part.
+	/*	Used for the mainLoop to display the screens. (Optional!)
+	*	hDown: the hidKeysDown() variable.
+	*	hHeld: the HidKeysHeld() variable.
+	*	touch: The TouchPosition variable.
+	*/
 	void mainLoop(u32 hDown, u32 hHeld, touchPosition touch);
 
-	// Set a specific Screen.
+	/* Set a specific Screen.
+	*	screen: unique_ptr of the screen. (Optional by using the screen class.)
+	*/
 	void setScreen(std::unique_ptr<Screen> screen);
 
-	// Go a Screen back.
+	//	Go a Screen back. (Optional by using the screen class.)
 	void screenBack();
 
-	// Set on which screen to draw.
+	/*	Set on which screen to draw.
+	*	screen: The render target. (Targets are inside the screenCommon.hpp file.)
+	*/
 	void ScreenDraw(C3D_RenderTarget * screen);
 
-	// Draw a grid.
+	/*	Draws a grid.
+	*	xPos: X Position of the grid.
+	*	yPos: Y Position of the grid.
+	*	Width: Width of the grid.
+	*	Height: Height of the grid.
+	*	color: Color of the grid.
+	*/
 	void drawGrid(float xPos, float yPos, float Width, float Height, u32 color);
 
-	// Draw an animated selector.
-	void drawAnimatedSelector(float xPos, float yPos, float Width, float Height, float speed, u32 SelectorColor, u32 colour);
+	/*	Draws an animated selector.
+	*	xPos: X Position of the selector.
+	*	yPos: Y Position of the Selector.
+	*	Width: Width of the Selector.
+	*	Height: Height of the Selector.
+	*	speed: The speed of the animation. (Use .030 or something by default.)
+	*	SelectorColor: The Color of the Selector.
+	*	bgColor: The Color from the middle of the Selector. (Optional! It's transparent by default.)
+	*/
+	void drawAnimatedSelector(float xPos, float yPos, float Width, float Height, float speed, u32 SelectorColor, u32 bgColor = C2D_Color32(0, 0, 0, 0));
 }
 
 #endif

hid.cpp

@@ -27,49 +27,35 @@
 #include "hid.hpp"
 
 HID::HID(size_t EntryPerPage, size_t EntryAmount) {
-	maxEntries = EntryAmount;
-	pageEntry = EntryPerPage;
+	this->maxEntries = EntryAmount;
+	this->pageEntry = EntryPerPage;
 }
 
-size_t HID::getIndex() {
-	return currentEntry;
-}
+size_t HID::getIndex() { return this->currentEntry; }
 
-size_t HID::getMaxEntries() {
-	return maxEntries;
-}
+size_t HID::getMaxEntries() { return this->maxEntries; }
 
-void HID::nextEntry() {
-	if (currentEntry < maxEntries-1) {
-		currentEntry++;
-	}
-}
+void HID::nextEntry() { if (this->currentEntry < this->maxEntries-1)	this->currentEntry++; }
 
-void HID::lastEntry() {
-	if (currentEntry > 0) {
-		currentEntry--;
-	}
-}
+void HID::lastEntry() { if (this->currentEntry > 0)	this->currentEntry--; }
 
 void HID::nextPage() {
 	// Only go to the next page, if the next Page doesn't reach the maxEntries.
-	if (currentEntry + pageEntry < maxEntries - 1) {
-		currentPage++;
-		currentEntry += pageEntry;
+	if (this->currentEntry + this->pageEntry < this->maxEntries - 1) {
+		this->currentPage++;
+		this->currentEntry += this->pageEntry;
 		// If the first index of the page is smaller than maxEntries -> Go to the next page.
-	} else if (currentPage * pageEntry < maxEntries - 1) {
-		currentPage++;
-		currentEntry = currentPage * pageEntry;
+	} else if (this->currentPage * this->pageEntry < this->maxEntries - 1) {
+		this->currentPage++;
+		this->currentEntry = this->currentPage * this->pageEntry;
 	}
 }
 
-size_t HID::getPage() {
-	return currentPage;
-}
+size_t HID::getPage() { return this->currentPage; }
 
 void HID::prevPage() {
-	if (currentPage > 0) {
-		currentPage--;
-		currentEntry -= pageEntry;
+	if (this->currentPage > 0) {
+		this->currentPage--;
+		this->currentEntry -= this->pageEntry;
 	}
 }

hid.hpp

@@ -24,29 +24,46 @@
 *         reasonable ways as different from the original version.
 */
 
-#ifndef HID_HPP
-#define HID_HPP
+#ifndef _UNIVERSAL_CORE_HID_HPP
+#define _UNIVERSAL_CORE_HID_HPP
 
 #include <cstddef>
 
 class HID
 {
 public:
-	// The parameters to initialize this class.
+
+	/*	The parameters to initialize this class.
+	*	EntryPage: The entries per page.
+	*	EntryAmount: The amount of entries.
+	*/
 	HID(size_t EntryPerPage, size_t EntryAmount);
-	// get the current index.
+
+	/*	Get the current index.
+	*	returns the current index as a size_t.
+	*/
 	size_t getIndex();
-	// get the max amount of the index.
+
+	/*	Get the max amount of the entries per page.
+	*	returns the max amount of entries per page as a size_t.
+	*/
 	size_t getMaxEntries();
+
 	// Go to the next Entry, if maxEntries is not reached.
 	void nextEntry();
+
 	// Go to the last Entry, if 0 is not reached.
 	void lastEntry();
+
 	// Go to the next Page.
 	void nextPage();
+
 	// Go to the previous Page.
 	void prevPage();
-	// Get the current page.
+
+	/*	Get the current page.
+	*	returns the current page as a size_t.
+	*/
 	size_t getPage();
 
 private:

screen.hpp

@@ -24,8 +24,8 @@
 *         reasonable ways as different from the original version.
 */
 
-#ifndef SCREEN_HPP
-#define SCREEN_HPP
+#ifndef _UNIVERSAL_CORE_SCREEN_HPP
+#define _UNIVERSAL_CORE_SCREEN_HPP
 
 #include <3ds.h>
 #include <memory>

screenCommon.hpp

@@ -24,8 +24,8 @@
 *         reasonable ways as different from the original version.
 */
 
-#ifndef SCREENCOMMON_HPP
-#define SCREENCOMMON_HPP
+#ifndef _UNIVERSAL_CORE_SCREENCOMMON_HPP
+#define _UNIVERSAL_CORE_SCREENCOMMON_HPP
 
 #include "gui.hpp"
 #include "structs.hpp"

structs.hpp

@@ -24,8 +24,8 @@
 *         reasonable ways as different from the original version.
 */
 
-#ifndef STRUCTS_HPP
-#define STRUCTS_HPP
+#ifndef _UNIVERSAL_CORE_STRUCTS_HPP
+#define _UNIVERSAL_CORE_STRUCTS_HPP
 
 #include <string>