CODEWITHSUNDEEP
c#treeview
user34537
user34537

Reputation:

TreeView control in C#, select() and focus

When I select a Node in the TreeView, it highlights and I show data based on that Node. When I select another Control (the TreeView loses focus) it is no longer highlighted. How do I keep it highlighted after losing focus?
While doing a search I cant tell which node is selected since I must keep the focus on the textbox (so the user can type more text).

Upvotes: 8

Views: 9002

Answers (3)

wnutt
wnutt

Reputation: 549

If the highlight color isn't bright enough to your liking when HideSelection is set to False and the TreeView lost focus:

Make sure your TreeView's HideSelection is set to True (default value).

Then handle the TreeView's Enter and Leave events like:

void myTreeView_Leave(object sender, EventArgs e)
{
    if((sender as TreeView).SelectedNode != null)
        (sender as System.Windows.Forms.TreeView).SelectedNode.BackColor = Color.Red; //your highlight color
}

void myTreeView_Enter(object sender, EventArgs e)
{
    if((sender as TreeView).SelectedNode != null)
        (sender as TreeView).SelectedNode.BackColor = (sender as TreeView).BackColor;
}

Upvotes: 0

Bedasso
Bedasso

Reputation: 1682

I just run into this issue and this is how I addressed it: Changed the DrawMode property to TreeViewDrawMode.OwnerDrawText and registered to DrawNode event

 
    private void MyTreeGridview_DrawNode(object sender, DrawTreeNodeEventArgs e) 
    {
        if ((e.State == TreeNodeStates.Selected) && (!MyTreeGridview.Focused))
        {
            Font font = e.Node.NodeFont ?? e.Node.TreeView.Font;
            Color fore = e.Node.ForeColor;
            if (fore == Color.Empty)fore = e.Node.TreeView.ForeColor;      
            fore = SystemColors.HighlightText;
            Color highlightColor = SystemColors.Highlight;
            e.Graphics.FillRectangle(new SolidBrush(highlightColor), e.Bounds);
            ControlPaint.DrawFocusRectangle(e.Graphics, e.Bounds, fore, highlightColor);
            TextRenderer.DrawText(e.Graphics, e.Node.Text, font, e.Bounds, fore, highlightColor, TextFormatFlags.GlyphOverhangPadding);
        }
        else
        {
            e.DrawDefault = true;
        }
    }

Upvotes: 4

bernhardrusch
bernhardrusch

Reputation: 11910

You have to set the HideSelection property to false - so you'll see the selection, altough the TreeView control lost focus

Upvotes: 10

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