TreeView Control problem

[Adrian Soon]

Hi All, I working on my treeView. I had a treeView with both CheckBox and Expandlist. I had a "NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)" method. inside the method I wish to know whether I click on is a checkbox or the expand + button. how can I do it?

[Luc Pattyn]

Have a look at TreeView.HitTest() and in particular its Location property. :)

Luc Pattyn [Forum Guidelines] [My Articles]

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[Adrian Soon]

Hi thanks, but tat don't do the trick. I felt. my tree goes like this. c:\ ---a\ ---b\ -----a\ -----b\ ---c\ -----a\ -----b\ -------a\ -------b\ ---d\ I nd to find out whether I click is a + sign or a check box. how to program it? thanks.

[Hessam Jalali]

You can find list expanding using AfterExpand and BeforeExpands events and from the e argument you can find the affected node and action and the same approach works for check boxes with using AfterCheck and BeforeCheck events

    public Form1()
    {
        InitializeComponent();
        this.treeView1.BeforeExpand += new TreeViewCancelEventHandler(treeView1\_BeforeExpand);
        this.treeView1.BeforeCheck += new TreeViewCancelEventHandler(treeView1\_BeforeCheck);
    }

    void treeView1\_BeforeCheck(object sender, TreeViewCancelEventArgs e)
    {
        StringBuilder str=new StringBuilder();
        str.AppendFormat("\[Check\]   Name: {0}  CurrentStatus: {1}  NextStatus: {2}",e.Node.Text,e.Node.Checked.ToString(),(!e.Node.Checked).ToString());
        MessageBox.Show(str.ToString());
    }

    void treeView1\_BeforeExpand(object sender, TreeViewCancelEventArgs e)
    {
        StringBuilder str = new StringBuilder();
        str.AppendFormat("\[Expand\]   Name: {0}  CurrentStatus: {1}  NextStatus: {2}", e.Node.Text, e.Node.IsExpanded.ToString(), (!e.Node.IsExpanded).ToString());
        MessageBox.Show(str.ToString());
    }

good luck

[Adrian Soon]

I tink U don't get wat I mean See.. when I click using the mouse. it enter tv_local_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e) method In the method I wish to know whether I click on the check or click on the expand slot. is there a way??? -- modified at 5:04 Tuesday 14th August, 2007

[Hessam Jalali]

this.treeView1.BeforeExpand += new TreeViewCancelEventHandler(treeView1_BeforeExpand); associates method treeView1_BeforeExpand to this.treeView1.BeforeExpand event and same thing for the next one

[Hessam Jalali]

when you click on the node it's not going to expand or checked ,it's just clicked and for expanding them you must click on the + sign not the node so the click event would not be invoked but the BeforeExpand event would as beforeCheck event for checkboxes So there is no way to find the check or expand with click event (I think your problem was here) but with other four events I said before you can. if you need them to call the same method with expanding-checking and clicking you can do this

    public Form1()
    {
        InitializeComponent();
        this.treeView1.BeforeExpand += new TreeViewCancelEventHandler(treeView1\_comb);
        this.treeView1.BeforeCheck += new TreeViewCancelEventHandler(treeView1\_comb);
        this.treeView1.Click += new EventHandler(treeView1\_comb);
        this.treeView1.BeforeCollapse += new TreeViewCancelEventHandler(treeView1\_comb);

    }


    void treeView1\_comb(object sender, EventArgs e)
    {
        if (e is TreeViewCancelEventArgs)
        {
            TreeViewCancelEventArgs te = e as TreeViewCancelEventArgs;

            if (te.Action == TreeViewAction.Expand)
            {
                /\*node expanded\*/
                MessageBox.Show("On Expand");
            }
            else if (te.Action == TreeViewAction.Collapse)
            {
                /\*node Collapsed\*/
                MessageBox.Show("On Collapse");
            }
            else if (te.Action == TreeViewAction.ByKeyboard || te.Action == TreeViewAction.ByMouse)
            {
                /\*node checked\*/
                MessageBox.Show("On Check");
            }

        }
        else
        {
            //the node is just clicked
            MessageBox.Show("On Click");
        }
    }

as you see ,there is single method associated to four events for four different signals and you can simply do this with After events ,just change TreeViewCancelEventArgs to TreeViewEventArgs and associate after events instead of before events hope this one Help

[Adrian Soon]

Thanks I had tried ur method however no matter wat I click on it when to the last else statement. which means "if (e is TreeViewCancelEventArgs)" <== Had always been false isn't there a way I can stop a NodeMouseClickEvent in a BeforeExpand Method? if i can do something like this my problem will be solve. that wat I felt coz current situation is that when i click on expand it will call the NodeMouseClickEvent too which my mouse click event had other function to do which will affect the expand method which affect the result I wan to show. thanks private void tv_local_BeforeExpand(object sender, TreeViewCancelEventArgs e) { tv_local.Click -= new TreeNodeMouseClickEventHandler(tv_local_NodeMouseClick); tv_local.Click += new TreeNodeMouseClickEventHandler(tv_local_NodeMouseClick); }

[Hessam Jalali]

Hi it seems very odd so I upload the source that I tried on 2 PCs and it worked well you can test it if you want here is the link http://rapidshare.com/files/49488493/TreeViewTest.zip.html (does not contain executables) I sent it to you because I had some GUI problems in programming after installing transform pack on Xp so this code is tested on other two computers and can show this kind of errors good luck -- modified at 3:50 Friday 17th August, 2007

[Adrian Soon]

Hi, thanks. I can't see the link. but thanks for the advice it do gif me some clue to do my stuff. thanks alot.

[Hessam Jalali]

Sorry I Forgot to put the link :-O http://rapidshare.com/files/49488493/TreeViewTest.zip.html best regards

[Adrian Soon]

Hi. care to send to my emaiL? pls thanks.. I can't find my way to download this. :):):)

[Hessam Jalali]

Ok but I couldn't find your public email :( so try this one http://hjk.4shared.com/ and if did not work give me your Email address best regards