protected override void WndProc(ref Message m)
{
if (m.Msg == WM_VSCROLL)
{
GetScrollPosition(out int min, out int max, out int pos, out int smallchange, out int largechange);
ScrollPositionChanged?.Invoke(this, pos);
if (_vScrollbar != null)
{
_vScrollbar.Value = pos;
}
}
else if (m.Msg == WM_NCCALCSIZE) // WM_NCCALCSIZE
{
int style = (int)GetWindowLong(this.Handle, GWL_STYLE);
if ((style & WS_VSCROLL) == WS_VSCROLL)
{
SetWindowLong(this.Handle, GWL_STYLE, style & ~WS_VSCROLL);
}
}
else if (m.Msg == LVM_INSERTITEMA || m.Msg == LVM_INSERTITEMW)
{
OnItemAdded();
}
else if (m.Msg == LVM_DELETEITEM || m.Msg == LVM_DELETEALLITEMS)
{
OnItemsRemoved();
}
base.WndProc(ref m);
}
protected override void OnResize(EventArgs e)
{
base.OnResize(e);
this.ScrollPosition = this.ScrollPosition;
UpdateHorizontalScrollWidth();
ScrollPositionChanged?.Invoke(this, e);
}
private void ctrlTextbox_ScrollPositionChanged(object sender, EventArgs e)
{
this.vScrollBar.Value = this.ctrlTextbox.ScrollPosition;
this.hScrollBar.Value = this.ctrlTextbox.HorizontalScrollPosition;
UpdateHorizontalScrollbar();
UpdateVerticalScrollbar();
ScrollPositionChanged?.Invoke(null, null);
}
/// <summary>
/// An application-defined function that processes messages sent to a window.
/// </summary>
/// <param name="message">
/// System defined windows message.
/// </param>
protected override void WndProc(ref Message message)
{
if (message.Msg == WM_VSCROLL || message.Msg == WM_MOUSEWHEEL ||
LoWord(message.WParam) == (int)ScrollBarCommands.SB_LINEUP ||
LoWord(message.WParam) == (int)ScrollBarCommands.SB_LINEDOWN ||
LoWord(message.WParam) == (int)ScrollBarCommands.SB_PAGEUP ||
LoWord(message.WParam) == (int)ScrollBarCommands.SB_PAGEDOWN ||
LoWord(message.WParam) == (int)ScrollBarCommands.SB_THUMBTRACK ||
LoWord(message.WParam) == (int)ScrollBarCommands.SB_THUMBPOSITION)
{
// Update immediate position of the scrollbar returned by the function
// 'GetScrollbarPosition' in the label 'lbScrollbarPosition'.
ScrollPositionChanged?.Invoke(this, new ScrollEventArgs(ScrollEventType.EndScroll, GetScrollbarPosition()));
}
base.WndProc(ref message);
}
public void MoveSelectionUp(int lines = 1)
{
_disableScrollPositionChangedEvent = true;
while (lines > 0)
{
bool singleLineSelection = this.SelectionLength == 0;
if (singleLineSelection)
{
if (this.SelectionStart == 0)
{
//Top of document reached
break;
}
this.SelectionStart--;
this.SelectedLine = this.SelectionStart;
this.SelectionLength++;
}
else if (this.SelectionStart == this.SelectedLine)
{
if (this.SelectionStart == 0)
{
//Top of document reached
break;
}
this.SelectionStart--;
this.SelectedLine--;
this.SelectionLength++;
}
else
{
this.SelectedLine--;
this.SelectionLength--;
}
lines--;
}
_disableScrollPositionChangedEvent = false;
ScrollPositionChanged?.Invoke(this, null);
}
public void MoveSelectionDown(int lines = 1)
{
_disableScrollPositionChangedEvent = true;
while (lines > 0)
{
bool singleLineSelection = this.SelectionLength == 0;
if (singleLineSelection)
{
if (this.SelectionStart + this.SelectionLength >= this._contents.Length - 1)
{
//End of document reached
break;
}
this.SelectedLine = this.SelectionStart + 1;
this.SelectionLength++;
}
else if (this.SelectionStart + this.SelectionLength == this.SelectedLine)
{
if (this.SelectionStart + this.SelectionLength >= this._contents.Length - 1)
{
//End of document reached
break;
}
this.SelectedLine++;
this.SelectionLength++;
}
else
{
this.SelectionStart++;
this.SelectedLine++;
this.SelectionLength--;
}
lines--;
}
_disableScrollPositionChangedEvent = false;
ScrollPositionChanged?.Invoke(this, null);
}
private void OnScrollPositionChanged()
{
ScrollPositionChanged?.Invoke(this, null);
}
private void OnScrollPositionChanged()
{
ScrollPositionChanged?.Invoke(this, EventArgs.Empty);
Invalidate();
}
public void Scrolled(UIScrollView scrollView)
{
ScrollPositionChanged?.Invoke(this, scrollView.ContentOffset.Y);
}
