?
Solved

TreeView Component

Posted on 1998-12-16
1
Medium Priority
?
306 Views
Last Modified: 2009-07-29
I am trying to drag a TTreeNode from one TTreeView component to another using the onDragDrop event. I have set the DragMode to dmAutomatic for both components but at run time when I select a node, it seems to picking up the TTreeView component itself rather than the selected node.

So, as soonas I began dragging, the cursor changes to DragNoDrop preventing the onDragDrop event from occuring.

Have, I missed some vital property setting? I am using the standard code provided in the help for the OnDragDrop event, but I can't get the event to go off.

Lee Berry
0
Comment
Question by:leeberry2
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 3

Accepted Solution

by:
williams2 earned 200 total points
ID: 1351341
When you set your Drag mthod to dmAutomatic, you'll have to provide some extra code to make the control accept the drag. This is done by this example:

procedure TForm1.TreeView1DragOver(Sender, Source: TObject; X, Y: Integer;
  State: TDragState; var Accept: Boolean);
begin
  Accept:= True;
end;


You will ofcourse have to to this on both TreeViews, but then it will work allright.

Regards,
Williams

BTW: If you are trying to use drag and drop with files, this will need special handling.. then use the components on www.melander.dk, they provide all the functions you'll need for that.
0

Featured Post

New feature and membership benefit!

New feature! Upgrade and increase expert visibility of your issues with Priority Questions.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…
Suggested Courses
Course of the Month14 days, 2 hours left to enroll

800 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question