mouse scroll

Question

Hi how to move through records by scrolling mouse. I have a ListViewItem where list of records are there. suppose 5 records are their in listviewitem. by default it will select the first record now when i scroll down the mouse the second third  fourth records are going to select till it get the end of the list. and in scroll up from the last records it will come to the first record one by one. Scrolling the mouse i want to move through the records. i am using windows application and C# as language. Please help. regards bjb

b b · Answer

Hi thanks for the reply but your code is not working on my case. In my case what i want is that I have a ListViewItem where list of records are there. suppose 5 records are their in ListViewItem. by default it will select(focus) the first record now when i scroll down the mouse the second will focus third will focus fourth records are going to select(focus) till it get the end of the list. and in scroll up from the last records it will come to the first record one by one. Scrolling the mouse i want to move through the records. i am using windows application and C# as language. Please help. regards bjb

Roei Bar · Answer

dont forget to mark this as Accepted Answer here is the code : class ListViewBase : ListView { private Timer tmrLVScroll ; private System . ComponentModel . IContainer components ; private int mintScrollDirection ; [ DllImport ( user32.dll  CharSet = CharSet . Auto )] private static extern int SendMessage ( IntPtr hWnd  int wMsg  IntPtr wParam  IntPtr lParam ); const int WM_VSCROLL = 277 ; // Vertical scroll const int SB_LINEUP = 0 ; // Scrolls one line up const int SB_LINEDOWN = 1 ; // Scrolls one line down public ListViewBase () { InitializeComponent (); } protected void InitializeComponent () { this . components = new System . ComponentModel . Container (); this . tmrLVScroll = new System . Windows . Forms . Timer ( this . components ); this . SuspendLayout (); // // tmrLVScroll // this . tmrLVScroll . Tick += new System . EventHandler ( this . tmrLVScroll_Tick ); // // ListViewBase // this . DragOver += new System . Windows . Forms . DragEventHandler ( this . ListViewBase_DragOver ); this . ResumeLayout ( false ); } protected void ListViewBase_DragOver ( object sender  DragEventArgs e ) { Point position = PointToClient ( new Point ( e . X  e . Y )); if ( position . Y ( Font . Height / 2 )) { // getting close to top ensure previous item is visible mintScrollDirection = SB_LINEUP ; tmrLVScroll . Enabled = true ; } else if ( position . Y >= ClientSize . Height - Font . Height / 2 ) { // getting close to bottom ensure next item is visible mintScrollDirection = SB_LINEDOWN ; tmrLVScroll . Enabled = true ; } else { tmrLVScroll . Enabled = false ; } } private void tmrLVScroll_Tick ( object sender  EventArgs e ) { SendMessage ( Handle  WM_VSCROLL  ( IntPtr ) mintScrollDirection  IntPtr . Zero ); } }