private static bool ScrollBarParameterChanged(ScrollBarParameter scrollBarParameter1, ScrollBarParameter scrollBarParameter2)
{
return(scrollBarParameter1.StartValue != scrollBarParameter2.StartValue ||
scrollBarParameter1.EndValue != scrollBarParameter2.EndValue ||
scrollBarParameter1.SmallChange != scrollBarParameter2.SmallChange ||
scrollBarParameter1.LargeChange != scrollBarParameter2.LargeChange);
}
private void UpdateVScrollBar()
{
int linesOnScreen = FullyVisibleLines;
(double min, double max) = GetVisibleRange(linesOnScreen);
(double smallChange, double largeChange) = CalcScrollChange(min, max, linesOnScreen, 1);
var newScrollBarParameter = new ScrollBarParameter(min, max, smallChange, largeChange);
UpdateScrollBarParameter(newScrollBarParameter);
}
private void UpdateScrollBarParameter(ScrollBarParameter parameter)
{
bool update = curScrollBarParameter.StartValue != parameter.StartValue ||
curScrollBarParameter.EndValue != parameter.EndValue ||
curScrollBarParameter.SmallChange != parameter.SmallChange ||
curScrollBarParameter.LargeChange != parameter.LargeChange;
if (update)
{
curScrollBarParameter = parameter;
IntSetVScroll(curScrollBarParameter.StartValue, curScrollBarParameter.EndValue);
}
}
private void OnScrollBarValueChanged(System.Windows.Controls.Primitives.ScrollBar scrollBar, ScrollBarParameter parameter)
{
if (scrollBar != null)
{
double oldThumbLength = scrollBar.GetThumbLength();
double oldThumbCenter = scrollBar.GetThumbCenter();
double newThumbLength = parameter.EndValue - parameter.StartValue;
double newThumbCenter = (parameter.StartValue + parameter.EndValue) / 2;
bool newEnabled = (parameter.StartValue > 0 || parameter.EndValue < 1);
double newMaximuum = newEnabled ? 1 : 0;
if (oldThumbLength != newThumbLength ||
oldThumbCenter != newThumbCenter ||
scrollBar.SmallChange != parameter.SmallChange ||
scrollBar.LargeChange != parameter.LargeChange ||
scrollBar.IsEnabled != newEnabled ||
scrollBar.Maximum != newMaximuum)
{
scrollBar.IsEnabled = newEnabled;
scrollBar.Maximum = newMaximuum;
scrollBar.SmallChange = parameter.SmallChange;
scrollBar.LargeChange = parameter.LargeChange;
scrollBar.SetThumbLength(newThumbLength);
scrollBar.SetThumbCenter(newThumbCenter);
}
}
}
private void STextBox_VScrollBarValueChanged(object sender, ScrollBarParameter parameter)
{
OnScrollBarValueChanged(vScrollBar, parameter);
}