如何修改treeview的背景色

最新推荐文章于 2021-09-09 15:24:16 发布

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通常TreeView背景色不可修改，可通过API实现。博客给出了相关源码，包括对User32库中SendMessage、GetWindowLong、SetWindowLong等函数的声明，以及在Form_Load事件中调用这些函数修改TreeView背景色和样式的代码。

在通常情况下，treeview的背景色是不可以修改的，我们可以通过API实现，源码如下

Option Explicit

Private Declare Function SendMessage Lib "User32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Long) As Long
Private Declare Function GetWindowLong Lib "User32" Alias "GetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "User32" Alias "SetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

Private Const GWL_STYLE = -16&
Private Const TVM_SETBKCOLOR = 4381&
Private Const TVM_GETBKCOLOR = 4383&
Private Const TVS_HASLINES = 2&

Private Sub Form_Load()

Dim nodex As Node
Dim i As Integer
Dim lStyle As Long

Call SendMessage(TreeView1.hWnd, TVM_SETBKCOLOR, 0, ByVal RGB(255, 0, 0))
lStyle = GetWindowLong(TreeView1.hWnd, GWL_STYLE)
Call SetWindowLong(TreeView1.hWnd, GWL_STYLE, lStyle - TVS_HASLINES)
Call SetWindowLong(TreeView1.hWnd, GWL_STYLE, lStyle)

TreeView1.Style = tvwTreelinesPlusMinusPictureText
TreeView1.BorderStyle = ccFixedSingle
With TreeView1.Nodes
Set nodex = .Add(, , "R", "Root")
nodex.BackColor = RGB(255, 0, 0)
For i = 1 To 10
    Set nodex = .Add("R", tvwChild, "C" & i, "Child " & i)
    nodex.BackColor = RGB(255, 0, 0)
    nodex.EnsureVisible
Next
End With

End Sub