/** DGui project file.

Copyright: Trogu Antonio Davide 2011-2013

License: $(HTTP boost.org/LICENSE_1_0.txt, Boost License 1.0).

Authors: Trogu Antonio Davide
*/
module dguihub.imagelist;

import dguihub.core.interfaces.idisposable;
import dguihub.core.collection;
import dguihub.core.charset;
import dguihub.core.winapi;
import dguihub.core.handle;
import dguihub.canvas;

enum ColorDepth : uint {
   depth4bit = ILC_COLOR4,
   depth8bit = ILC_COLOR8,
   depth16bit = ILC_COLOR16,
   depth24bit = ILC_COLOR24,
   depth32bit = ILC_COLOR32,
}

/*
 * Dynamic Binding (Uses The Latest Version Available)
 */

private alias extern (Windows) HIMAGELIST function(int, int, uint, int, int) ImageList_CreateProc;
private alias extern (Windows) HIMAGELIST function(HIMAGELIST) ImageList_DestroyProc;
private alias extern (Windows) BOOL function(HIMAGELIST, int) ImageList_RemoveProc;
private alias extern (Windows) int function(HIMAGELIST, HICON) ImageList_AddIconProc;
private alias extern (Windows) int function(HIMAGELIST, int, HDC, int, int, UINT) ImageList_DrawProc;
private alias extern (Windows) int function(HIMAGELIST, COLORREF) ImageList_SetBkColorProc;

class ImageList : Handle!(HIMAGELIST), IDisposable {
   private static ImageList_CreateProc imageList_Create;
   private static ImageList_RemoveProc imageList_Remove;
   private static ImageList_AddIconProc imageList_AddIcon;
   private static ImageList_DestroyProc imageList_Destroy;
   private static ImageList_DrawProc imageList_Draw;
   private static ImageList_SetBkColorProc imageList_SetBkColor;

   private ColorDepth _depth = ColorDepth.depth32bit;
   private Size _size;
   private Collection!(Icon) _images;

   public this() {
      if (!imageList_Create) {
         HMODULE hModule = getModuleHandle("comctl32.dll");

         /*
			  * Static Library Issue: Use Dynamic Binding so Visual Styles are enabled (if supported)
			  */

         imageList_Create = cast(ImageList_CreateProc)GetProcAddress(hModule, "ImageList_Create");
         imageList_Remove = cast(ImageList_RemoveProc)GetProcAddress(hModule, "ImageList_Remove");
         imageList_AddIcon = cast(ImageList_AddIconProc)GetProcAddress(hModule, "ImageList_AddIcon");
         imageList_Destroy = cast(ImageList_DestroyProc)GetProcAddress(hModule, "ImageList_Destroy");
         imageList_Draw = cast(ImageList_DrawProc)GetProcAddress(hModule, "ImageList_Draw");
         imageList_SetBkColor = cast(ImageList_SetBkColorProc)GetProcAddress(hModule,
               "ImageList_SetBkColor");
      }
   }

   public ~this() {
      if (this.created) {
         this.dispose();
      }
   }

   public void dispose() {
      foreach (Icon i; this._images) {
         i.dispose(); //Dispose Icons before delete the ImageList.
      }

      imageList_Destroy(this._handle);
   }

   @property public override HIMAGELIST handle() {
      if (!this.created) {
         if (this._size == nullSize) {
            this._size.width = 16;
            this._size.height = 16;
         }

         this._handle = imageList_Create(this._size.width, this._size.height,
               this._depth | ILC_MASK, 0, 0);
         imageList_SetBkColor(this._handle, CLR_NONE);
      }

      return super.handle;
   }

   public final void drawIcon(int i, Canvas dest, Point pos) {
      imageList_Draw(this._handle, i, dest.handle, pos.x, pos.y, ILD_NORMAL);
   }

   public final int addImage(Icon ico) {
      if (!this._images) {
         this._images = new Collection!(Icon)();
      }

      this._images.add(ico);

      if (!this.created) {
         if (this._size == nullSize) {
            this._size.width = 16;
            this._size.height = 16;
         }

         this._handle = imageList_Create(this._size.width, this._size.height,
               this._depth | ILC_MASK, 0, 0);
         imageList_SetBkColor(this._handle, CLR_NONE);
      }

      return imageList_AddIcon(this._handle, ico.handle);
   }

   public final void removeImage(int index) {
      if (this._images) {
         this._images.removeAt(index);
      }

      if (this.created) {
         imageList_Remove(this._handle, index);
      }
   }

   public final void clear() {
      imageList_Remove(this._handle, -1);
   }

   @property public final Icon[] images() {
      if (this._images) {
         return this._images.get();
      }

      return null;
   }

   @property public final Size size() {
      return this._size;
   }

   @property public final void size(Size sz) {
      this._size = sz;
   }

   @property public final ColorDepth colorDepth() {
      return this._depth;
   }

   @property public final void colorDepth(ColorDepth depth) {
      this._depth = depth;
   }
}