[英]List view sort arrow vb.net
我正在嘗試在列表視圖列標題上繪制排序箭頭以及默認的視覺樣式
到目前為止,我已經知道了
Private Sub List_DrawColumnHeader(sender As Object, e As DrawListViewColumnHeaderEventArgs) Handles List.DrawColumnHeader
e.DrawDefault = True
If e.ColumnIndex = selectedIndex Then
e.Graphics.DrawImage(ImageList1.Images(1), CType(e.Bounds.Left + e.Bounds.Width / 2, Single) - 5, -2)
End If
End Sub
但是視覺風格是以某種方式繪制在箭頭上的,所以我認為我可以嘗試這樣做:
Private Sub List_DrawColumnHeader(sender As Object, e As DrawListViewColumnHeaderEventArgs) Handles List.DrawColumnHeader
e.DrawDefault = True
If lastDrawn.ColumnIndex = selectedIndex Then
e.Graphics.DrawImage(ImageList1.Images(1), CType(lastDrawn.Bounds.Left + lastDrawn.Bounds.Width / 2, Single) - 5, -2)
End If
lastDrawn=e
End Sub
當下一個對應的列被繪制時它會繪制箭頭,但是我無法為最后一列繪制它
截圖:
為了使用.NET內置解決方案顯示列表視圖列標題的自定義圖標,您需要:
該示例類(一種簡單的形式)顯示了如何正確地設置圖像,而不使用ListView標題列的自定義繪圖。
它沒有實現任何形式! (此MSDN文章中顯示了如何實現ListViewSorter)
在對列進行排序之后,您需要實現一個自定義ListView-Sorter類並從中檢索圖像或圖像鍵。
Public Class SimpleForm
Inherits Form
Private sortItems = New ImageList()
Dim lv As ListView = New ListView()
Dim so = System.Windows.Forms.SortOrder.Ascending
Public Sub New()
' create columns, items and ListView
Dim columns = New List(Of ColumnHeader)
Dim c1 = New ColumnHeader()
c1.Name = "c1"
c1.Text = "Name"
Dim c2 = New ColumnHeader()
c2.Name = "c2"
c2.Text = "Type"
columns.Add(c1)
columns.Add(c2)
Dim items = New List(Of ListViewItem)
Dim i1 = New ListViewItem("Terminator")
i1.SubItems.Add("T1000")
Dim i2 = New ListViewItem("Terminator")
i2.SubItems.Add("T10")
Dim i3 = New ListViewItem("J.C.")
i3.SubItems.Add("Human")
items.Add(i1)
items.Add(i2)
items.Add(i3)
' init and bind column click
lv.Columns.AddRange(columns.ToArray())
lv.Items.AddRange(items.ToArray())
lv.SmallImageList = sortItems
lv.View = View.Details
lv.Dock = DockStyle.Fill
Controls.Add(lv)
AddHandler lv.ColumnClick, AddressOf clickEventHandler
' init images list
sortItems.TransparentColor = System.Drawing.Color.Transparent
sortItems.Images.Add("up", Image.FromFile("d:\temp\32\arrow_up.gif"))
sortItems.Images.Add("down", Image.FromFile("d:\temp\32\arrow_down.gif"))
sortItems.Images.Add("empty", Image.FromFile("d:\temp\32\check.gif"))
End Sub
Private Sub clickEventHandler(ByVal o As Object, ByVal e As ColumnClickEventArgs)
' Implement a custom ListViewItemSorter and fetch the icon from it!
' Set the ListViewItemSorter property to a new ListViewItemComparer
' object. Setting this property immediately sorts the
' ListView using the ListViewItemComparer object.
' THIS CODE SHOWS ONLY HOW TO SET THE SORT ICON!
For i As Integer = 0 To lv.Columns.Count - 1
If (i = e.Column) Then
Select Case (so)
Case System.Windows.Forms.SortOrder.Ascending
lv.Columns(i).ImageKey = "up"
so = System.Windows.Forms.SortOrder.Descending
Case System.Windows.Forms.SortOrder.Descending
lv.Columns(i).ImageKey = "down"
so = System.Windows.Forms.SortOrder.Ascending
Case Else
lv.Columns(i).ImageKey = "empty"
so = System.Windows.Forms.SortOrder.None
End Select
Else
lv.Columns(i).ImageKey = "empty"
End If
Next i
End Sub
End Class
輸出看起來像這樣:
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