[Treeview] DrawNode = Sapin de Noel ?!

bonjour Seb.26
Pas de bidouile mon vieux.
Voici comment traiter ce cas simple avec un exemple tire de la sdk msdn.

il faut se servir du rectangle de selection car il est dessine avant le texte du node comme bacground du controle.
De plus ce rectangle a 2 etats (selectione et non selectionE =>2 couleurs).

Ensuite est dessine le texte du node et apres tout ce peut rajouter par exemple un message string ou un icon.
e.boounds est en lecture seile et sert pour le dessin par defaut :
-du rectangle de selection
-du texte du node.....

code vb.net :

Code:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
 
Public Class frmTreeViewDrawItemIconD
 
    Private tagIcon As Icon = My.Resources.Boss
 
    Private Sub frmTreeViewDrawItem_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Me.TreeView1.DrawMode = TreeViewDrawMode.OwnerDrawText
    End Sub
    Private Sub btnPopulate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPopulate.Click
        InitializeTreeView()
    End Sub
    ' Populates a TreeView control with example nodes. 
    Private Sub InitializeTreeView()
        TreeView1.BeginUpdate()
        TreeView1.Nodes.Add("Parent")
        TreeView1.Nodes(0).Tag = tagIcon
        TreeView1.Nodes(0).BackColor = Color.Yellow
 
        TreeView1.Nodes(0).Nodes.Add("Child 1")
        TreeView1.Nodes(0).Nodes.Add("Child 2")
 
        TreeView1.Nodes(0).Nodes(1).Nodes.Add("Grandchild")
        TreeView1.Nodes(0).Nodes(1).Nodes(0).Nodes.Add("Great Grandchild")
        TreeView1.Nodes(0).Nodes(1).Nodes(0).Tag = tagIcon
        TreeView1.Nodes(0).Nodes(1).Nodes(0).BackColor = Color.Yellow
 
        TreeView1.Nodes(0).Nodes.Add("Child 3")
        TreeView1.Nodes(0).Nodes(2).Tag = tagIcon
        TreeView1.Nodes(0).Nodes(2).BackColor = Color.Yellow
 
        TreeView1.EndUpdate()
    End Sub
    'version icone à droite
    Private Sub TreeView1_DrawNode(ByVal sender As Object, ByVal e As System.Windows.Forms.DrawTreeNodeEventArgs) Handles TreeView1.DrawNode
 
        ' Retrieve the node font. If the node font has not been set,
        ' use the TreeView font.
        If e.Node.NodeFont Is Nothing Then
            e.Node.NodeFont = CType(sender, TreeView).Font
        End If
 
 
        ' Draw the background and node text for a selected node.
        If (e.State And TreeNodeStates.Selected) <> 0 Then
 
            ' Draw the background of the selected node. The NodeBounds
            ' method makes the highlight rectangle large enough to
            ' include the icon of a node tag, if one is present.
 
            e.Graphics.FillRectangle(Brushes.Blue, NodeBounds(e.Node))
 
            ' Draw the node text.
            e.Graphics.DrawString(e.Node.Text, e.Node.NodeFont, Brushes.Red, _
               e.Bounds.Left, e.Bounds.Top)
 
            ' Use the default background and node text.
        Else
            e.DrawDefault = True
        End If
 
        ' If a node tag is present, draw its icon 
        ' to the right of the label text.
        If (e.Node.Tag IsNot Nothing) Then
 
            e.Graphics.DrawIcon(CType(e.Node.Tag, Icon), _
            NodeBounds(e.Node).Right - CType(e.Node.Tag, Icon).Width, NodeBounds(e.Node).Top)
 
        End If
 
        ' If the node has focus, draw the focus rectangle large, making
        ' it large enough to include the icon of the node tag, if present.
        If (e.State And TreeNodeStates.Focused) <> 0 Then
            Dim focusPen As New Pen(Color.Black)
            Try
                focusPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot
                Dim focusBounds As Rectangle = NodeBounds(e.Node)
                focusBounds.Size = New Size(focusBounds.Width - 1, _
                    focusBounds.Height - 1)
                e.Graphics.DrawRectangle(focusPen, focusBounds)
            Finally
                focusPen.Dispose()
            End Try
        End If
    End Sub
    '***   CALCUL DU RECTANGLE DE SELECTION    ***
 
    'Returns the bounds of the specified node, including the region 
    'occupied by the node label and any node tag displayed.
    Private Function NodeBounds(ByVal node As TreeNode) As Rectangle
 
        'Set the return value to the normal node bounds.
        Dim bounds As Rectangle = node.Bounds
        If (node.Tag IsNot Nothing) Then
 
            'Retrieve a Graphics object from the TreeView handle
            'and use it to calculate the display width of the tag
 
            Dim g As Graphics = TreeView1.CreateGraphics()
 
            'Adjust the node bounds using the calculated value.
 
            '1- mesure  largeur du node.text suivant 
            'le NodeFont utilise & ajuste le rectangle de selection 
 
            Dim tagWidth As Integer = CInt(g.MeasureString( _
               node.Text, node.NodeFont).Width)
            bounds.Width = tagWidth
 
 
            '2-mesure la largeur d'icon 
            tagWidth = CType(node.Tag, Icon).Width
 
            'decale le sommet -x- du  rectangle de selection 
            bounds.Offset(tagWidth / 2, 0)
 
            ' ------ rappel :une dilatation accroit a gauche et à droite simuultanement).... 
            'dilate  suivant -x-  de tagWidth / 2  tel que
            bounds = Rectangle.Inflate(bounds, tagWidth / 2, 0)
            g.Dispose()
        End If
        Return bounds
    End Function 'NodeBounds
 
 
 
End Class

code csharp:

Code:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
 
 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
 
namespace TreeViewDrawItemCSharp
{
 
    //private System.  Icon tagIcon = My.Resources.Boss;
    public partial class Form1 : Form
    {
        //charge un icone Boss.ico a partir des resources du projet
         private Icon  tagIcon =TreeViewDrawItemCSharp.Properties.Resources.Boss;
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            this.treeView1.DrawMode = TreeViewDrawMode.OwnerDrawText;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            InitializeTreeView();
        }
        // Populates a TreeView control with example nodes. 
        private void InitializeTreeView()
        {
            treeView1.BeginUpdate();
           // un icon pour le parent
            treeView1.Nodes.Add("Parent");
            treeView1.Nodes[0].Tag = tagIcon;
            treeView1.Nodes[0].BackColor = Color.Yellow;
 
 
            treeView1.Nodes[0].Nodes.Add("Child 1");
            treeView1.Nodes[0].Nodes.Add("Child 2");
 
            // un icon pour le petit fils
            treeView1.Nodes[0].Nodes[1].Nodes.Add("Grandchild");
            treeView1.Nodes[0].Nodes[1].Nodes[0].Nodes.Add("Great Grandchild");
            treeView1.Nodes[0].Nodes[1].Nodes[0].Tag = tagIcon;
            treeView1.Nodes[0].Nodes[1].Nodes[0].BackColor = Color.Yellow;
 
            // un icon pour le  3 fils
            treeView1.Nodes[0].Nodes.Add("Child 3");
            treeView1.Nodes[0].Nodes[2].Tag = tagIcon;
            treeView1.Nodes[0].Nodes[2].BackColor = Color.Yellow;
 
 
 
            treeView1.EndUpdate();
        }
 
        private void treeView1_DrawNode(object sender, DrawTreeNodeEventArgs e)
        {
            // Retrieve the node font. If the node font has not been set,
            // use the TreeView font.
            if (e.Node.NodeFont == null) e.Node.NodeFont = ((TreeView)sender).Font;
 
 
            // Draw the background and node text for a selected node.
            if ((e.State & TreeNodeStates.Selected) != 0)
            {
                // Draw the background of the selected node. The NodeBounds
                // method makes the highlight rectangle large enough to
                // include the text of a node tag, if one is present.
                e.Graphics.FillRectangle(Brushes.Green, NodeBounds(e.Node));
 
 
                // Draw the node text.
                e.Graphics.DrawString(e.Node.Text, e.Node.NodeFont , Brushes.White,
                    Rectangle.Inflate(e.Bounds, 2, 0));
            }
 
            // Use the default background and node text.
            else
            {
                e.DrawDefault = true;
            }
 
 
 
            // If a node tag is present, draw its icon 
            // to the right of the label text.
            if (e.Node.Tag != null)
            {
                Icon icn = (Icon)(e.Node.Tag);
                e.Graphics.DrawIcon(icn,
            NodeBounds(e.Node).Right - icn.Width, NodeBounds(e.Node).Top);
 
            }
 
            // If the node has focus, draw the focus rectangle large, making
            // it large enough to include the text of the node tag, if present.
            if ((e.State & TreeNodeStates.Focused) != 0)
            {
                using (Pen focusPen = new Pen(Color.Black))
                {
                    focusPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot;
                    Rectangle focusBounds = NodeBounds(e.Node);
                    focusBounds.Size = new Size(focusBounds.Width - 1,
                    focusBounds.Height - 1);
                    e.Graphics.DrawRectangle(focusPen, focusBounds);
                }
            }
 
        }
        /*   CALCUL DU RECTANGLE DE SELECTION    */
        // Returns the bounds of the specified node, including the region 
        // occupied by the node label and any node tag displayed.
        private Rectangle NodeBounds(TreeNode node)
        {
            // Set the return value to the normal node bounds.
            Rectangle bounds = node.Bounds;
            if (node.Tag != null)
            {
                // Retrieve a Graphics object from the TreeView handle
                // and use it to calculate the display width of the tag.
                Graphics g = treeView1.CreateGraphics();
 
                // Adjust the node bounds using the calculated value.
 
 
                //  1- mesure  largeur du node.text suivant 
                //  le NodeFont utilise & ajuste le rectangle de selection 
 
                int tagWidth = (int)(g.MeasureString( 
                   node.Text, node.NodeFont).Width);
                bounds.Width = tagWidth;
 
                //  2-mesure la largeur d'icon 
                Icon icn = (Icon)(node.Tag);
                tagWidth = icn.Width;
 
                // decale le sommet -x- du  rectangle de selection 
 
                bounds.Offset(tagWidth / 2, 0);
 
 
               /* ------ rappel :une dilatation accroit a gauche et à droite simuultanement)....*/ 
               //   dilate  suivant -x-  de tagWidth / 2  tel que
 
                bounds = Rectangle.Inflate(bounds, tagWidth / 2, 0);
                g.Dispose();
            }
 
            return bounds;
 
        }
 
 
 
    }
}

bon code...