Add grid default image and folder image

Add default game image and folder image to the grid. They can be configured by the theme with the gameImage and folderImage properties of the imagegrid.

THEMES.md

@@ -578,6 +578,10 @@ Can be created as an extra.
 * `size` - type: NORMALIZED_PAIR.
     - The size of the grid. Take care the selected tile can go out of the grid size, so don't position the grid too close to another element or the screen border.
 * `margin` - type: NORMALIZED_PAIR.
+* `gameImage` - type: PATH.
+    - The default image used for games which doesn't have an image.
+* `folderImage` - type: PATH.
+    - The default image used for folders which doesn't have an image.
 * `scrollDirection` - type: STRING.
     - `vertical` by default, can also be set to `horizontal`. Not that in `horizontal` mod, the tiles are ordered from top to bottom, then from left to right.
 

es-core/src/ThemeData.cpp

@@ -29,6 +29,8 @@ std::map<std::string, std::map<std::string, ThemeData::ElementPropertyType>> The
 		{ "pos", NORMALIZED_PAIR },
 		{ "size", NORMALIZED_PAIR },
 		{ "margin", NORMALIZED_PAIR },
+		{ "gameImage", PATH },
+		{ "folderImage", PATH },
 		{ "scrollDirection", STRING } } },
 	{ "gridtile", {
 		{ "size", NORMALIZED_PAIR },

es-core/src/components/ImageGridComponent.h

@@ -2,6 +2,7 @@
 #ifndef ES_CORE_COMPONENTS_IMAGE_GRID_COMPONENT_H
 #define ES_CORE_COMPONENTS_IMAGE_GRID_COMPONENT_H
 
+#include "Log.h"
 #include "components/IList.h"
 #include "resources/TextureResource.h"
 #include "GridTileComponent.h"
@@ -61,6 +62,8 @@ private:
 
 	// IMAGES & ENTRIES
 	bool mEntriesDirty;
+	std::shared_ptr<TextureResource> mDefaultGameTexture;
+	std::shared_ptr<TextureResource> mDefaultFolderTexture;
 
 	// TILES
 	Vector2f mMargin;
@@ -80,6 +83,8 @@ ImageGridComponent<T>::ImageGridComponent(Window* window) : IList<ImageGridData,
 	Vector2f screen = Vector2f((float)Renderer::getScreenWidth(), (float)Renderer::getScreenHeight());
 
 	mEntriesDirty = true;
+	mDefaultGameTexture = TextureResource::get(":/blank_game.png");
+	mDefaultFolderTexture = TextureResource::get(":/folder.png");
 
 	mSize = screen * 0.80f;
 	mMargin = screen * 0.07f;
@@ -96,7 +101,21 @@ void ImageGridComponent<T>::add(const std::string& name, const std::string& imag
 	typename IList<ImageGridData, T>::Entry entry;
 	entry.name = name;
 	entry.object = obj;
-	entry.data.texture = ResourceManager::getInstance()->fileExists(imagePath) ? TextureResource::get(imagePath) : TextureResource::get(":/button.png");
+
+	if (ResourceManager::getInstance()->fileExists(imagePath))
+	{
+		entry.data.texture = TextureResource::get(imagePath);
+	}
+	else
+	{
+		// FileType::FOLDER = 2, but FileData is our template parameter T,
+		// so we don't want to bring that dependence to FileData here
+		if (obj->getType() == 2)
+			entry.data.texture = mDefaultFolderTexture;
+		else
+			entry.data.texture = mDefaultGameTexture;
+	}
+
 	static_cast<IList< ImageGridData, T >*>(this)->add(entry);
 	mEntriesDirty = true;
 }
@@ -189,6 +208,50 @@ void ImageGridComponent<T>::applyTheme(const std::shared_ptr<ThemeData>& theme,
 
 		if (elem->has("scrollDirection"))
 			mScrollDirection = (ScrollDirection)(elem->get<std::string>("scrollDirection") == "horizontal");
+
+		if (elem->has("gameImage"))
+		{
+			std::string path = elem->get<std::string>("gameImage");
+
+			if (!ResourceManager::getInstance()->fileExists(path))
+				LOG(LogWarning) << "Could not replace default game image, check path: " << path;
+			else
+			{
+				std::shared_ptr<TextureResource> oldDefaultGameTexture = mDefaultGameTexture;
+
+				mDefaultGameTexture = TextureResource::get(path);
+
+				// mEntries are already loaded at this point,
+				// so we need to update them with new game image texture
+				for (auto it = mEntries.begin(); it != mEntries.end(); it++)
+				{
+					if ((*it).data.texture == oldDefaultGameTexture)
+						(*it).data.texture = mDefaultGameTexture;
+				}
+			}
+		}
+
+		if (elem->has("folderImage"))
+		{
+			std::string path = elem->get<std::string>("folderImage");
+
+			if (!ResourceManager::getInstance()->fileExists(path))
+				LOG(LogWarning) << "Could not replace default folder image, check path: " << path;
+			else
+			{
+				std::shared_ptr<TextureResource> oldDefaultFolderTexture = mDefaultFolderTexture;
+
+				mDefaultFolderTexture = TextureResource::get(path);
+
+				// mEntries are already loaded at this point,
+				// so we need to update them with new folder image texture
+				for (auto it = mEntries.begin(); it != mEntries.end(); it++)
+				{
+					if ((*it).data.texture == oldDefaultFolderTexture)
+						(*it).data.texture = mDefaultFolderTexture;
+				}
+			}
+		}
 	}
 
 	// We still need to manually get the grid tile size here,