internal void RenderItem(ShengImageListViewItem item)
{
if (Suspend == false)
{
_layoutManager.RenderItem(this.CreateGraphics(), item);
}
}
/// <summary>
/// 双击项
/// </summary>
/// <param name="item"></param>
public void OnItemDoubleClick(ShengImageListViewItem item)
{
if (ItemDoubleClick != null)
{
ItemDoubleClick(this, new ShengImageListViewItemDoubleClickEventArgs(item));
}
}
/// <summary>
/// 判断指定的项是否处于可见状态
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
public ShengImageListViewItemVisibility IsItemVisible(ShengImageListViewItem item)
{
int itemIndex = _imageListView.Items.IndexOf(item);
if (_imageListView.Items.Count == 0)
{
return(ShengImageListViewItemVisibility.NotVisible);
}
if (itemIndex < 0 || itemIndex > _imageListView.Items.Count - 1)
{
return(ShengImageListViewItemVisibility.NotVisible);
}
if (itemIndex < _firstPartiallyVisible || itemIndex > _lastPartiallyVisible)
{
return(ShengImageListViewItemVisibility.NotVisible);
}
else if (itemIndex >= _firstVisible && itemIndex <= _lastVisible)
{
return(ShengImageListViewItemVisibility.Visible);
}
else
{
return(ShengImageListViewItemVisibility.PartiallyVisible);
}
}
/// <summary>
/// 绘制项的内容
/// </summary>
/// <param name="g"></param>
/// <param name="bounds"></param>
/// <param name="item"></param>
internal virtual void DrawItemContent(Graphics g, Rectangle bounds, ShengImageListViewItem item)
{
//显示debug信息
string debugInfo = item.Index + Environment.NewLine +
bounds.ToString() + Environment.NewLine +
item.State.ToString();
g.DrawString(debugInfo, SystemFonts.DefaultFont, Brushes.Black, bounds);
}
public bool Container(ShengImageListViewItem item)
{
Debug.Assert(item != null, "ImageListViewItem 为 null");
if (item == null)
{
return(false);
}
return(_thumbnails.Keys.Contains(item));
}
/// <summary>
/// 绘制项
/// </summary>
/// <param name="g"></param>
/// <param name="item"></param>
/// <param name="state"></param>
/// <param name="bounds"></param>
internal virtual void DrawItem(Graphics g, ShengImageListViewItem item)
{
Rectangle bounds = LayoutManager.GetItemBounds(item);
g.SetClip(bounds);
DrawItemBackground(g, bounds);
Rectangle backgroundRect = bounds;
backgroundRect.Width -= 1;
backgroundRect.Height -= 1;
// Paint background Selected
if ((LayoutManager.Focused && ((item.State & ShengImageListViewItemState.Selected) == ShengImageListViewItemState.Selected)) ||
(LayoutManager.Focused == false && ((item.State & ShengImageListViewItemState.Selected) == ShengImageListViewItemState.Selected) && ((item.State & ShengImageListViewItemState.Hovered) == ShengImageListViewItemState.Hovered)))
{
using (Brush bSelected = new LinearGradientBrush(backgroundRect, Theme.SelectedColorStart, Theme.SelectedColorEnd, LinearGradientMode.Vertical))
{
// ImageListViewUtility.FillRoundedRectangle(g, bSelected, bounds, 4);
g.FillPath(bSelected, DrawingTool.RoundedRect(backgroundRect, _radius));
}
}
// Paint background unfocused
else if (LayoutManager.Focused == false && ((item.State & ShengImageListViewItemState.Selected) == ShengImageListViewItemState.Selected))
{
using (Brush bGray64 = new LinearGradientBrush(backgroundRect, Theme.UnFocusedColorStart, Theme.UnFocusedColorEnd, LinearGradientMode.Vertical))
{
// ImageListViewUtility.FillRoundedRectangle(g, bGray64, bounds, 4);
g.FillPath(bGray64, DrawingTool.RoundedRect(backgroundRect, _radius));
}
}
// Paint background Hovered
//如果正处于框选状态，不绘制Hover状态，减小闪烁
if (LayoutManager.MouseSelecting == false && (item.State & ShengImageListViewItemState.Hovered) == ShengImageListViewItemState.Hovered)
{
using (Brush bHovered = new LinearGradientBrush(backgroundRect, Theme.HoverColorStart, Theme.HoverColorEnd, LinearGradientMode.Vertical))
{
// ImageListViewUtility.FillRoundedRectangle(g, bHovered, bounds, 4);
g.FillPath(bHovered, DrawingTool.RoundedRect(backgroundRect, _radius));
}
}
DrawItemBorder(g, bounds);
// Focus rectangle
if (LayoutManager.Focused && ((item.State & ShengImageListViewItemState.Focused) == ShengImageListViewItemState.Focused))
{
ControlPaint.DrawFocusRectangle(g, bounds);
}
DrawItemContent(g, bounds, item);
}
protected override void OnMouseDoubleClick(MouseEventArgs e)
{
if (ItemDoubleClick != null)
{
ShengImageListViewHitInfo hitInfo = _layoutManager.HitTest(e.Location);
if (hitInfo.ItemHit)
{
ShengImageListViewItem item = Items[hitInfo.ItemIndex];
OnItemDoubleClick(item);
}
}
base.OnMouseDoubleClick(e);
}
public void RenderItem(Graphics g, ShengImageListViewItem item)
{
if (LayoutManager.Suspend)
{
return;
}
if (LayoutManager.IsItemVisible(item) == ShengImageListViewItemVisibility.NotVisible)
{
return;
}
DrawItem(g, item);
}
public Image GetThumbnail(ShengImageListViewItem item)
{
Debug.Assert(item != null, "ImageListViewItem 为 null");
if (item == null)
{
throw new ArgumentNullException();
}
if (Container(item) == false)
{
throw new ArgumentOutOfRangeException();
}
return(_thumbnails[item]);
}
public void AddThumbnail(ShengImageListViewItem item, Image thumbnail)
{
Debug.Assert(item != null, "ImageListViewItem 为 null");
Debug.Assert(thumbnail != null, "thumbnail 为 null");
if (item == null || thumbnail == null)
{
return;
}
if (Container(item))
{
Debug.Assert(false, "已经缓存过了指定 ImageListViewItem 的缩略图");
return;
}
_thumbnails.Add(item, thumbnail);
}
/// <summary>
/// 移除指定项的缓存缩略图，并dispose
/// </summary>
/// <param name="item"></param>
public void RemoveThumbnail(ShengImageListViewItem item)
{
Debug.Assert(item != null, "ImageListViewItem 为 null");
if (item == null)
{
return;
}
if (Container(item) == false)
{
Debug.Assert(false, "不存在指定 ImageListViewItem 的缓存缩略图");
return;
}
_thumbnails[item].Dispose();
_thumbnails.Remove(item);
}
internal override void DrawItemContent(Graphics g, Rectangle bounds, ShengImageListViewItem item)
{
if (_thumbnailSizeInited == false)
{
SizeF headerSize = g.MeasureString(item.Header, Theme.ItemHeaderFont);
_headerHeight = (int)Math.Ceiling(headerSize.Height);
int width = LayoutManager.ItemSize.Width - _itemPadding.Width * 2;
//_itemPadding.Height * 3 是因为去掉缩略图顶部，底部，和与文本区域之间的Padding
int height = LayoutManager.ItemSize.Height - _itemPadding.Height * 3 - _headerHeight;
_thumbnailSize = new Size(width, height);
_thumbnailSizeInited = true;
}
#region 绘制缩略图
Image img = null;
if (_thumbnailsCache.Container(item))
{
img = _thumbnailsCache.GetThumbnail(item);
}
else
{
img = DrawingTool.GetScaleImage(item.Image, _thumbnailSize);
_thumbnailsCache.AddThumbnail(item, img);
}
if (img != null)
{
Rectangle pos = DrawingTool.GetSizedImageBounds(img, new Rectangle(bounds.Location + _itemPadding, _thumbnailSize));
g.DrawImage(img, pos);
// Draw image border
if (Math.Min(pos.Width, pos.Height) > 32)
{
using (Pen pOuterBorder = new Pen(Theme.ImageOuterBorderColor))
{
g.DrawRectangle(pOuterBorder, pos);
}
if (System.Math.Min(_thumbnailSize.Width, _thumbnailSize.Height) > 32)
{
using (Pen pInnerBorder = new Pen(Theme.ImageInnerBorderColor))
{
//Rectangle.Inflate(pos, -1, -1) 用于取内框
g.DrawRectangle(pInnerBorder, Rectangle.Inflate(pos, -1, -1));
}
}
}
}
#endregion
#region 绘制文本
_headerBounds = new Rectangle();
_headerBounds.X = _itemPadding.Width;
_headerBounds.Y = LayoutManager.ItemSize.Height - _headerHeight - _itemPadding.Height;
_headerBounds.Width = _thumbnailSize.Width;
_headerBounds.Height = _headerHeight;
_headerBounds.Offset(bounds.Location);
//g.DrawRectangle(Pens.Gray, _headerBounds);
using (SolidBrush brush = new SolidBrush(Theme.ItemHeaderColor))
{
g.DrawString(item.Header, Theme.ItemHeaderFont, brush, _headerBounds, _itemHeaderStringFormat);
}
#endregion
}
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;
}
ShengImageListViewItem 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 <ShengImageListViewItem> 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();
}
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 <ShengImageListViewItem> oldSelectedItems = _imageListView.GetSelectedItems();
ShengImageListViewHitInfo hitInfo = HitTest(e.Location);
if (hitInfo.ItemHit)
{
ShengImageListViewItem item = _imageListView.Items[hitInfo.ItemIndex];
List <ShengImageListViewItem> allItems = _imageListView.Items.ToList();
ShengImageListViewItem 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++)
{
ShengImageListViewItem 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 <ShengImageListViewItem> newSelectedItems = _imageListView.GetSelectedItems();
if (oldSelectedItems.SequenceEqual(newSelectedItems) == false)
{
_imageListView.NeedPaint();
_imageListView.OnSelectedItemChanged();
}
}
/// <summary>
/// 获取项的呈现区域
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
public Rectangle GetItemBounds(ShengImageListViewItem item)
{
int index = _imageListView.Items.IndexOf(item);
return(GetItemBounds(index));
}
public ShengImageListViewItemDoubleClickEventArgs(ShengImageListViewItem item)
{
Item = item;
}
public void RenderItem(Graphics graphics, ShengImageListViewItem item)
{
Debug.Assert(MouseSelecting == false, "MouseSelecting 为 " + MouseSelecting.ToString());
_renderer.RenderItem(graphics, item);
}