MarkupListBox
Printed From: Codejock Forums
Category: Codejock Products
Forum Name: MarkupLabel Control
Forum Description: Topics Related to Codejock MarkupLabel Control
URL: http://forum.codejock.com/forum_posts.asp?TID=16535
Printed Date: 23 November 2024 at 11:12pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: MarkupListBox
Posted By: jimmy
Subject: MarkupListBox
Date Posted: 29 March 2010 at 6:30am
Hello,
i use the MarkupListBox from MarkupSample.
But is you scroll with mouse wheel it's look like horror.
see markup sample (9 entrys).
Any solution for this ?
Jimmy
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Replies:
Posted By: jimmy
Date Posted: 29 March 2010 at 7:46am
Hello,
found a solution.
Handle WM_MOUSEWHEEL my self.
void CMarkupListBox::OnHandleMouseWheel(WPARAM wParam, LPARAM lParam)
{
short zDelta = GET_WHEEL_DELTA_WPARAM(wParam);
// Don't do anything if the vertical scrollbar is not enabled.
int scrollMin = 0, scrollMax = 0;
GetScrollRange(SB_VERT, &scrollMin, &scrollMax);
if ( scrollMin == scrollMax )
return;
// Compute the number of scrolling increments requested.
int numScrollIncrements = abs(zDelta) / WHEEL_DELTA;
// Each scrolling increment corresponds to a certain number of
// scroll lines (one scroll line is like a SB_LINEUP or SB_LINEDOWN).
// We need to query the system parameters for this value.
int numScrollLinesPerIncrement = 0;
::SystemParametersInfo(SPI_GETWHEELSCROLLLINES, 0, &numScrollLinesPerIncrement, 0);
// Check if a page scroll was requested.
if ( numScrollLinesPerIncrement == WHEEL_PAGESCROLL )
{
SendMessage(WM_VSCROLL, zDelta > 0 ? SB_PAGEUP : SB_PAGEDOWN, 0);
return;
}
// Compute total number of lines to scroll.
int numScrollLines = numScrollIncrements * numScrollLinesPerIncrement;
// Adjust numScrollLines to slow down the scrolling a bit more.
numScrollLines = max(numScrollLines/3, 1);
// Do the scrolling.
for(int i = 0; i < numScrollLines; ++i)
SendMessage(WM_VSCROLL, zDelta > 0 ? SB_LINEUP : SB_LINEDOWN, 0);
}
Jimmy
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