public static IDisposable CreateTransactionIf(bool condition, Control controlToLayout, IArrangedElement elementCausingLayout, string property)
{
if (condition)
{
return(new LayoutTransaction(controlToLayout, elementCausingLayout, property));
}
CommonProperties.xClearPreferredSizeCache(elementCausingLayout);
return(new NullLayoutTransaction());
}
public static void DoLayout(IArrangedElement elementToLayout, IArrangedElement elementCausingLayout, string property)
{
if (elementCausingLayout != null)
{
CommonProperties.xClearPreferredSizeCache(elementCausingLayout);
if (elementToLayout != null)
{
CommonProperties.xClearPreferredSizeCache(elementToLayout);
elementToLayout.PerformLayout(elementCausingLayout, property);
}
}
}
public static void DoLayout(IArrangedElement elementToLayout, IArrangedElement elementCausingLayout, string property)
{
if (elementCausingLayout != null)
{
CommonProperties.xClearPreferredSizeCache(elementCausingLayout);
if (elementToLayout != null)
{
CommonProperties.xClearPreferredSizeCache(elementToLayout);
elementToLayout.PerformLayout(elementCausingLayout, property);
}
}
Debug.Assert(elementCausingLayout != null, "LayoutTransaction.DoLayout - elementCausingLayout is null, no layout performed - did you mix up your parameters?");
}
// This overload should be used when a property has changed that affects preferred size,
// but you only want to layout if a certain condition exists (say you want to layout your
// parent because your preferred size has changed).
public static void DoLayoutIf(bool condition, IArrangedElement elementToLayout, IArrangedElement elementCausingLayout, string property)
{
if (!condition)
{
if (elementCausingLayout != null)
{
CommonProperties.xClearPreferredSizeCache(elementCausingLayout);
}
}
else
{
LayoutTransaction.DoLayout(elementToLayout, elementCausingLayout, property);
}
}
internal static void xClearAllPreferredSizeCaches(IArrangedElement start)
{
CommonProperties.xClearPreferredSizeCache(start);
ArrangedElementCollection controlsCollection = start.Children;
// This may have changed the sizes of our children.
// PERFNOTE: This is more efficient than using Foreach. Foreach
// forces the creation of an array subset enum each time we
// enumerate
for (int i = 0; i < controlsCollection.Count; i++)
{
xClearAllPreferredSizeCaches(controlsCollection[i]);
}
}
public LayoutTransaction(Control controlToLayout, IArrangedElement controlCausingLayout, string property, bool resumeLayout)
{
CommonProperties.xClearPreferredSizeCache(controlCausingLayout);
this._controlToLayout = controlToLayout;
this._resumeLayout = resumeLayout;
if (this._controlToLayout != null)
{
this._controlToLayout.SuspendLayout();
CommonProperties.xClearPreferredSizeCache(this._controlToLayout);
if (resumeLayout)
{
this._controlToLayout.PerformLayout(new LayoutEventArgs(controlCausingLayout, property));
}
}
}
public LayoutTransaction(Control controlToLayout, IArrangedElement controlCausingLayout, string property, bool resumeLayout)
{
CommonProperties.xClearPreferredSizeCache(controlCausingLayout);
_controlToLayout = controlToLayout;
_resumeLayout = resumeLayout;
if (_controlToLayout != null)
{
#if DEBUG
_layoutSuspendCount = _controlToLayout.LayoutSuspendCount;
#endif
_controlToLayout.SuspendLayout();
CommonProperties.xClearPreferredSizeCache(_controlToLayout);
// Same effect as calling performLayout on Dispose but then we would have to keep
// controlCausingLayout and property around as state.
if (resumeLayout)
{
_controlToLayout.PerformLayout(new LayoutEventArgs(controlCausingLayout, property));
}
}
}