imagelist.go

// Copyright 2010 The Walk Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package walk

import . "github.com/lxn/go-winapi"

type ImageList struct {
	hIml      HIMAGELIST
	maskColor Color
}

func NewImageList(imageSize Size, maskColor Color) (*ImageList, error) {
	hIml := ImageList_Create(
		int32(imageSize.Width),
		int32(imageSize.Height),
		ILC_MASK|ILC_COLOR24,
		8,
		8)
	if hIml == 0 {
		return nil, newError("ImageList_Create failed")
	}

	return &ImageList{hIml: hIml, maskColor: maskColor}, nil
}

func (il *ImageList) Add(bitmap, maskBitmap *Bitmap) (int, error) {
	if bitmap == nil {
		return 0, newError("bitmap cannot be nil")
	}

	var maskHandle HBITMAP
	if maskBitmap != nil {
		maskHandle = maskBitmap.handle()
	}

	index := int(ImageList_Add(il.hIml, bitmap.handle(), maskHandle))
	if index == -1 {
		return 0, newError("ImageList_Add failed")
	}

	return index, nil
}

func (il *ImageList) AddMasked(bitmap *Bitmap) (int32, error) {
	if bitmap == nil {
		return 0, newError("bitmap cannot be nil")
	}

	index := ImageList_AddMasked(
		il.hIml,
		bitmap.handle(),
		COLORREF(il.maskColor))
	if index == -1 {
		return 0, newError("ImageList_AddMasked failed")
	}

	return index, nil
}

func (il *ImageList) Dispose() {
	if il.hIml != 0 {
		ImageList_Destroy(il.hIml)
		il.hIml = 0
	}
}

func (il *ImageList) MaskColor() Color {
	return il.maskColor
}