feat: wallpaper and colour preview

modules/background/Wallpaper.qml

@@ -42,7 +42,7 @@ Item {
         asynchronous: true
         fillMode: Image.PreserveAspectCrop
         opacity: 0
-        scale: 0.8
+        scale: Wallpapers.showPreview ? 1 : 0.8
 
         onStatusChanged: {
             if (status === Image.Ready)

modules/launcher/WallpaperList.qml

@@ -24,6 +24,12 @@ PathView {
     }
 
     Component.onCompleted: currentIndex = Wallpapers.list.findIndex(w => w.path === Wallpapers.current)
+    Component.onDestruction: Wallpapers.stopPreview()
+
+    onCurrentItemChanged: {
+        if (currentItem)
+            Wallpapers.preview(currentItem.modelData.path);
+    }
 
     implicitWidth: Math.min(LauncherConfig.maxWallpapers, count) * (LauncherConfig.sizes.wallpaperWidth * 0.8 + Appearance.padding.larger * 2)
     pathItemCount: LauncherConfig.maxWallpapers

services/Colours.qml

@@ -33,8 +33,8 @@ Singleton {
         return Qt.hsla(c.hslHue, c.hslSaturation, 0.2, 1);
     }
 
-    function load(data: string, preview: bool): void {
-        const colours = preview ? preview : current;
+    function load(data: string, isPreview: bool): void {
+        const colours = isPreview ? preview : current;
         for (const line of data.trim().split("\n")) {
             let [name, colour] = line.split(" ");
             name = name.trim();

services/Wallpapers.qml

@@ -9,13 +9,13 @@ import Qt.labs.platform
 Singleton {
     id: root
 
-    readonly property string currentPath: `${StandardPaths.standardLocations(StandardPaths.GenericStateLocation)[0]}/caelestia/wallpaper/last.txt`.slice(7)
+    readonly property string currentNamePath: `${StandardPaths.standardLocations(StandardPaths.GenericStateLocation)[0]}/caelestia/wallpaper/last.txt`.slice(7)
     readonly property string path: `${StandardPaths.standardLocations(StandardPaths.PicturesLocation)[0]}/Wallpapers`.slice(7)
 
     property list<Wallpaper> list
     property bool showPreview: false
-    readonly property string current: showPreview ? preview : actualCurrent
-    property string preview
+    readonly property string current: showPreview ? previewPath : actualCurrent
+    property string previewPath
     property string actualCurrent
 
     readonly property list<var> preppedWalls: list.map(w => ({
@@ -33,19 +33,44 @@ Singleton {
     }
 
     function setWallpaper(path: string): void {
+        actualCurrent = path;
         setWall.path = path;
         setWall.startDetached();
     }
 
+    function preview(path: string): void {
+        previewPath = path;
+        showPreview = true;
+        getPreviewColoursProc.running = true;
+    }
+
+    function stopPreview(): void {
+        showPreview = false;
+        Colours.showPreview = false;
+    }
+
     reloadableId: "wallpapers"
 
     FileView {
-        path: root.currentPath
+        path: root.currentNamePath
         watchChanges: true
         onFileChanged: reload()
         onLoaded: root.actualCurrent = text().trim()
     }
 
+    Process {
+        id: getPreviewColoursProc
+
+        command: ["caelestia", "scheme", "print", root.previewPath]
+        stdout: SplitParser {
+            splitMarker: ""
+            onRead: data => {
+                Colours.load(data, true);
+                Colours.showPreview = true;
+            }
+        }
+    }
+
     Process {
         id: setWall