public SEListViewItemDoubleClickEventArgs(SEListViewItem item)
{
Item = item;
}
public void OnKeyDown(KeyEventArgs e)
{
// If the shift key or the control key is pressed and there is no focused item
// set the first item as the focused item.
if ((ShiftKey || ControlKey) && _imageListView.Items.Count != 0 &&
_imageListView.FocusedItem == null)
{
_imageListView.Items[0].Focused = true;
}
SEListViewItem currentFocusedItem = _imageListView.FocusedItem;
if (_imageListView.Items.Count != 0)
{
int index = 0;
if (currentFocusedItem != null)
{
index = currentFocusedItem.Index;
}
int newindex = ApplyNavKey(index, e.KeyCode);
if (index != newindex)
{
#region 根据新index做选择
if (ControlKey)
{
// Just move the focus
}
else if (_imageListView.AllowMultiSelection && ShiftKey)
{
int startIndex = 0;
int endIndex = 0;
List <SEListViewItem> selectedItems = _imageListView.GetSelectedItems();
if (selectedItems.Count != 0)
{
startIndex = selectedItems[0].Index;
endIndex = selectedItems[selectedItems.Count - 1].Index;
_imageListView.ClearSelect();
}
if (index == startIndex)
{
startIndex = newindex;
}
else if (index == endIndex)
{
endIndex = newindex;
}
for (int i = Math.Min(startIndex, endIndex); i <= Math.Max(startIndex, endIndex); i++)
{
_imageListView.Items[i].Selected = true;
}
}
else
{
_imageListView.ClearSelect();
_imageListView.Items[newindex].Selected = true;
}
currentFocusedItem.Focused = false;
_imageListView.Items[newindex].Focused = true;
EnsureVisible(newindex);
#endregion
//触发事件
_imageListView.OnSelectedItemChanged();
}
}
_imageListView.NeedPaint();
}
/// <summary>
/// 获取项的呈现区域
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
public Rectangle GetItemBounds(SEListViewItem item)
{
int index = _imageListView.Items.IndexOf(item);
return(GetItemBounds(index));
}
public void MouseDown(MouseEventArgs e)
{
/*
* 如果按下的是鼠标右键
* 如果按在已选定的项上，只切换焦点，不改变选择
* 如果按在未选定项上，则切换为点的项为选中项
* 不考虑键盘按键
*/
_mouseItemsAreaOffset = _itemsAreaOffset;
List <SEListViewItem> oldSelectedItems = _imageListView.GetSelectedItems();
SEListViewHitInfo hitInfo = HitTest(e.Location);
if (hitInfo.ItemHit)
{
SEListViewItem item = _imageListView.Items[hitInfo.ItemIndex];
List <SEListViewItem> allItems = _imageListView.Items.ToList();
SEListViewItem currentFocusedItem = _imageListView.FocusedItem;
if (_imageListView.LeftButton)
{
#region 如果不允许多选
if (_imageListView.AllowMultiSelection == false)
{
//如果点击的项就是当前选择的项
if (oldSelectedItems.Count > 0 && oldSelectedItems.Contains(item))
{
//判断Control键是否按下，如果按下了Control键，取消当前项的选择状态
if (_imageListView.ControlKey)
{
item.Selected = false;
}
}
else
{
//如果点击的项不是当前选择的项
//清除原选定项的选定状态
_imageListView.ClearSelect();
//设置新项为选定项
item.Selected = true;
}
}
#endregion
#region 如果允许多选
//在同时按下 Control 和 Shift 的情况下，优先考虑 Shift
else
{
#region 如果按下 Shift
//判断是否按下了 Shift ，如果按下 Shift，不考虑 Control 的状态
//也不用考虑是否点击的项是否是现有选定项之一
if (_imageListView.ShiftKey)
{
//如果当前存在具有输入焦点的项
if (currentFocusedItem != null && currentFocusedItem != item)
{
//连续选中从当前具有焦点的项至点击的项之间的所有项
//并将不在此范围内的项取消选中状态
int startIndex = Math.Min(currentFocusedItem.Index, hitInfo.ItemIndex);
int endIndex = Math.Max(currentFocusedItem.Index, hitInfo.ItemIndex);
foreach (var i in from c in oldSelectedItems where c.Index <startIndex || c.Index> endIndex select c)
{
i.Selected = false;
}
for (int i = startIndex; i <= endIndex; i++)
{
SEListViewItem eachItem = allItems[i];
if (eachItem.Selected == false)
{
eachItem.Selected = true;
}
}
}
//如果当前不存在具有输入焦点的项
else
{
//清除原选定项的选定状态
_imageListView.ClearSelect();
item.Selected = true;
}
}
#endregion
#region 如果 Shift键没有处于按下状态
else
{
#region 如果点击的项 是 当前选择的项之一
if (oldSelectedItems.Count > 0 && oldSelectedItems.Contains(item))
{
//判断是否按下了 Control，且没有按下 Shift
if (_imageListView.ControlKey && _imageListView.ShiftKey == false)
{
item.Selected = false;
}
//判断是否什么键都没有按下
if (_imageListView.ControlKey == false && _imageListView.ShiftKey == false)
{
//清除原选定项的选定状态
_imageListView.ClearSelect();
item.Selected = true;
}
}
#endregion
#region 如果点击的项 不是 当前选择的项之一
else
{
//判断Control键是否按下，如果按下了Control键，则保持原有选择的情况把新项也设置为选中
//否则清除当前选择
if (_imageListView.ControlKey == false)
{
//清除原选定项的选定状态
_imageListView.ClearSelect();
}
item.Selected = true;
}
#endregion
}
#endregion
}
#endregion
}
else
{
//如果点在未选中的项上
if (oldSelectedItems.Contains(item) == false)
{
_imageListView.ClearSelect();
//设置新项为选定项
item.Selected = true;
}
}
#region 为项设置输入焦点
//设置新的输入焦点要放在后面处理，因为在使用Shift连续选择时，需要用到原具有焦点的项
if (currentFocusedItem == null || (currentFocusedItem != null && currentFocusedItem != item))
{
if (currentFocusedItem != null)
{
currentFocusedItem.Focused = false;
}
item.Focused = true;
}
#endregion
}
else
{
_imageListView.ClearSelect();
}
List <SEListViewItem> newSelectedItems = _imageListView.GetSelectedItems();
if (oldSelectedItems.SequenceEqual(newSelectedItems) == false)
{
_imageListView.NeedPaint();
_imageListView.OnSelectedItemChanged();
}
}
public void RenderItem(Graphics graphics, SEListViewItem item)
{
Debug.Assert(MouseSelecting == false, "MouseSelecting 为 " + MouseSelecting.ToString());
_renderer.RenderItem(graphics, item);
}