Add some freewheelin' palette entry action

frontend/src/App.svelte

@@ -28,6 +28,19 @@
   let primaryColorIndex: number = 1
   let secondaryColorIndex: number = 0
 
+  // Oh no, what are you doing, step palette~
+  function stepPalette(step: number, primary: boolean) {
+    if (primary) {
+      primaryColorIndex += step
+      if (primaryColorIndex < 0) primaryColorIndex = focusedFile?.canvas.palette.length-1
+      if (primaryColorIndex >= focusedFile?.canvas.palette.length) primaryColorIndex = 0
+    } else {
+      secondaryColorIndex += step
+      if (secondaryColorIndex < 0) secondaryColorIndex = focusedFile?.canvas.palette.length-1
+      if (secondaryColorIndex >= focusedFile?.canvas.palette.length) secondaryColorIndex = 0
+    }
+  }
+  
   let showImport: boolean = false
   let importValid: boolean = false
   let importFile: data.StackistFileV1 = null
@@ -127,6 +140,10 @@
         <Shortcut global cmd='move down' keys={['arrowdown']} on:trigger={()=>toolMove.shift({file: focusedFile}, {x: 0, y: 1, id: 0})} />
         <Shortcut global cmd='brush' keys={['b']} on:trigger={()=>swapTool(toolBrush)} />
         <Shortcut global cmd='brushToPicker' keys={['alt']} on:trigger={()=>currentTool===toolBrush?swapTool(toolPicker):null} on:release={()=>previousTool===toolBrush&&currentTool===toolPicker?swapTool(toolBrush):null} />
+        <Shortcut global cmd='previousPrimaryPaletteEntry' keys={['alt+wheelup']} on:trigger={()=>stepPalette(-1, true)}/>
+        <Shortcut global cmd='nextPrimaryPaletteEntry' keys={['alt+wheeldown']} on:trigger={()=>stepPalette(1, true)}/>
+        <Shortcut global cmd='previousSecondaryPaletteEntry' keys={['alt+shift+wheelup']} on:trigger={()=>stepPalette(-1, false)}/>
+        <Shortcut global cmd='nextSecondaryPaletteEntry' keys={['alt+shift+wheeldown']} on:trigger={()=>stepPalette(1, false)}/>
         <Shortcut global cmd='fill' keys={['f']} on:trigger={()=>swapTool(toolFill)} />
         <Shortcut global cmd='picker' keys={['i']} on:trigger={()=>swapTool(toolPicker)} />
         <Shortcut global cmd='erase' keys={['e']} on:trigger={()=>swapTool(toolErase)} />

frontend/src/components/Shortcuts.svelte

@@ -71,6 +71,29 @@
     keys.delete(key.toLowerCase())
     keystring = keysToString([...keys])
   })
+
+  window.addEventListener('wheel', (event: WheelEvent) => {
+    if (event.deltaY < 0 || event.deltaX < 0) {
+      keys.add('wheelup')
+    } else if (event.deltaY > 0 || event.deltaX > 0) {
+      keys.add('wheeldown')
+    }
+
+    keystring = keysToString([...keys])
+    
+    let cur = get(currentShortcuts)
+    for (let shortcut of get(shortcuts)) {
+      if (shortcut.group !== cur.group) continue
+      if (!shortcut.global && shortcut.id !== cur.id) continue
+      if (shortcut.keys.includes(keystring)) {
+        shortcut.trigger()
+      }
+    }
+
+    keys.delete('wheelup')
+    keys.delete('wheeldown')
+  })
+
   window.addEventListener('blur', () => {
     keys.clear()
     keystring = ''

frontend/src/sections/Editor2D.svelte

@@ -274,6 +274,7 @@
         }
         return
       }
+      if (e.altKey) return
       if (e.deltaY < 0) {
         if (e.shiftKey) {
           offsetX--

frontend/src/sections/Palette.svelte

@@ -15,9 +15,21 @@
       primaryColorIndex = index
     }
   }
+  function handleWheel(event: WheelEvent) {
+    if (event.deltaX < 0) {
+      secondaryColorIndex = (secondaryColorIndex - 1 + file.canvas.palette.length) % file.canvas.palette.length
+    } else if (event.deltaX > 0) {
+      secondaryColorIndex = (secondaryColorIndex + 1) % file.canvas.palette.length
+    }
+    if (event.deltaY < 0) {
+      primaryColorIndex = (primaryColorIndex - 1 + file.canvas.palette.length) % file.canvas.palette.length
+    } else if (event.deltaY > 0) {
+      primaryColorIndex = (primaryColorIndex + 1) % file.canvas.palette.length
+    }
+  }
 </script>
 
-<main>
+<main on:wheel={handleWheel}>
   {#if file}
     {#each file.canvas.palette as palette, paletteIndex}
       <span on:click={paletteClick} x-index={paletteIndex} class='entry{paletteIndex===primaryColorIndex?' primary':''}{paletteIndex===secondaryColorIndex?' secondary':''}'>