public void AddRange(ImageListViewCollection value)
{
_owner.SuspendLayout();
for (int i = 0; (i < value.Count); i = (i + 1))
{
this.Add(value[i]);
}
_owner.ResumeLayout();
}
/// <summary>
/// 根据矩形区域选择项
/// </summary>
/// <param name="rect"></param>
private void SelectItemsByRectangle(Rectangle rect)
{
int viewOffset = _itemsAreaOffset;
Point pt1 = new Point(SelectionRectangle.Left, SelectionRectangle.Top);
Point pt2 = new Point(SelectionRectangle.Right, SelectionRectangle.Bottom);
//- ItemsArea.Y 和 - ItemsArea.X
//是因为，选择框的是以整个控件可视区域为坐标系的，而绘制的项是在Padding区内的
//那么就需要修正或者说同步这个偏差，才能得到正确的行列
int startRow = (int)Math.Floor((float)(Math.Min(pt1.Y, pt2.Y) + viewOffset - ItemsArea.Y) /
(float)this._itemSizeWithMargin.Height);
int endRow = (int)Math.Floor((float)(Math.Max(pt1.Y, pt2.Y) + viewOffset - ItemsArea.Y) /
(float)this._itemSizeWithMargin.Height);
int startCol = (int)Math.Floor((float)(Math.Min(pt1.X, pt2.X) - ItemsArea.X) /
(float)this._itemSizeWithMargin.Width);
int endCol = (int)Math.Floor((float)(Math.Max(pt1.X, pt2.X) - ItemsArea.X) /
(float)this._itemSizeWithMargin.Width);
//行不能这样判断，因为_rowCount表示的只是控件可视范围内的可视行数
//在框选时，框会跨越可视区域的，这里的endRow要的是实际的项所在行数
//列不存在这个问题，因为不支持水平滚动
//if (endRow >= _rowCount)
// endRow = _rowCount -1;
if (endCol >= _columnCount)
{
endCol = _columnCount - 1;
}
if (startCol < 0)
{
startCol = 0;
}
//创建一个应该被选定的项的index数组
int itemsCount = _imageListView.Items.Count;
List <int> selectItemsIndex = new List <int>();
for (int i = startRow; i <= endRow; i++)
{
for (int j = startCol; j <= endCol; j++)
{
int index = i * _columnCount + j;
if (index >= 0 && index < itemsCount)
{
selectItemsIndex.Add(index);
}
}
}
//如果当前没有按下Shift键，那么
//判断当前选定的项中有没有不在框选区内的，如果有将其取消选定
if (ShiftKey == false)
{
List <ImageListViewItem> currentSlectedItems = _imageListView.GetSelectedItems();
foreach (var item in currentSlectedItems)
{
if (selectItemsIndex.Contains(item.Index) == false)
{
item.Selected = false;
}
}
}
ImageListViewCollection allItems = _imageListView.Items;
//使框选区内的项都处于选中状态
foreach (var index in selectItemsIndex)
{
if (allItems[index].Selected == false)
{
allItems[index].Selected = true;
}
}
//debug
StartRow = startRow;
EndRow = endRow;
StartCol = startCol;
EndCol = endCol;
}
public ImageListViewItemEnumerator(ImageListViewCollection mappings)
{
this.temp = ((IEnumerable)(mappings));
this.baseEnumerator = temp.GetEnumerator();
}
public ImageListViewCollection(ImageListViewCollection value)
{
this.AddRange(value);
}