/// <summary>
/// The actual scroll magic is here
/// </summary>
private void SetDisplayRectLocation(YamuiScrollHandler scroll, int deltaValue)
{
if (deltaValue == 0 || !scroll.HasScroll)
{
return;
}
// (found in ScrollablePanel.SetDisplayRectLocation(0, deltaVerticalValue);)
Rectangle cr = ClientRectangle;
WinApi.RECT rcClip = WinApi.RECT.FromXYWH(cr.X, cr.Y, cr.Width - scroll.BarThickness, cr.Height);
WinApi.RECT rcUpdate = WinApi.RECT.FromXYWH(cr.X, cr.Y, cr.Width - scroll.BarThickness, cr.Height);
WinApi.ScrollWindowEx(
new HandleRef(this, Handle),
scroll.IsVertical ? 0 : deltaValue,
scroll.IsVertical ? deltaValue : 0,
null,
ref rcClip,
WinApi.NullHandleRef,
ref rcUpdate,
WinApi.ScrollWindowExFlags.SW_ERASE |
WinApi.ScrollWindowExFlags.SW_INVALIDATE |
WinApi.ScrollWindowExFlags.SW_SCROLLCHILDREN |
WinApi.ScrollWindowExFlags.SW_SMOOTHSCROLL);
UpdateChildrenBound();
Refresh(); // not critical but help reduce flickering
}
/// <summary>
/// Creates a new HtmlPanel and sets a basic css for it's styling.
/// </summary>
public YamuiScrollControl()
{
VerticalScroll = new YamuiScrollHandler(true, this)
{
SmallChange = 70,
LargeChange = 400,
BarThickness = ScrollBarWidth
};
HorizontalScroll = new YamuiScrollHandler(false, this)
{
SmallChange = 70,
LargeChange = 400,
BarThickness = ScrollBarWidth
};
VerticalScroll.OnValueChanged += OnScrollValueChanged;
VerticalScroll.OnScrollbarsRedrawNeeded += OnScrollbarsRedrawNeeded;
HorizontalScroll.OnValueChanged += OnScrollValueChanged;
HorizontalScroll.OnScrollbarsRedrawNeeded += OnScrollbarsRedrawNeeded;
}
public YamuiScrollPanel()
{
TabStop = false;
SetStyle(ControlStyles.Selectable, false);
SetStyle(ControlStyles.UserMouse, true);
VerticalScroll = new YamuiScrollHandler(true, this)
{
SmallChange = 70,
LargeChange = 400,
BarThickness = ScrollBarWidth
};
HorizontalScroll = new YamuiScrollHandler(false, this)
{
SmallChange = 70,
LargeChange = 400,
BarThickness = ScrollBarWidth
};
VerticalScroll.OnValueChanged += ScrollOnOnValueChanged;
VerticalScroll.OnScrollbarsRedrawNeeded += OnScrollbarsRedrawNeeded;
HorizontalScroll.OnValueChanged += ScrollOnOnValueChanged;
HorizontalScroll.OnScrollbarsRedrawNeeded += OnScrollbarsRedrawNeeded;
}
protected void PaintScrollBars(YamuiScrollHandler yamuiScrollHandler)
{
if (!IsHandleCreated)
{
return;
}
// get non client area device
var hdc = WinApi.GetWindowDC(new HandleRef(this, Handle));
if (hdc == IntPtr.Zero)
{
return;
}
try {
// paint the left over between the 2 scrolls (the small square)
if (_needBothScroll)
{
PaintOnRectangle(hdc, ref _leftoverBar, PaintLeftOver);
}
if (VerticalScroll.HasScroll)
{
var verticalBar = VerticalScroll.BarRect;
PaintOnRectangle(hdc, ref verticalBar, PaintVerticalScroll);
}
if (HorizontalScroll.HasScroll)
{
var horizontalBar = HorizontalScroll.BarRect;
PaintOnRectangle(hdc, ref horizontalBar, PaintHorizontalScroll);
}
} finally {
WinApi.ReleaseDC(new HandleRef(this, Handle), new HandleRef(null, hdc));
}
}