I'm trying to learn SharpDX by using an example program (http://sharpdxwpf.codeplex.com/SourceControl/latest#SharpDX.WPF.sln) ... it creates a quadrant of 4 shaded triangles using 4 different approaches and it just runs by itself redrawing the graphics. It runs continuously and seems to be event-driven because I continuously hit breakpoints in event handlers (see below) but I don't understand what triggers these events. In the XAML it has . . .
xmlns:dxc="clr-namespace:SharpDX.WPF;assembly=SharpDX.WPF". . .
<dxc:DXElement Grid.Column="0" Grid.Row="0" x:Name="dxview10"/><Image Grid.Column="1" Grid.Row="0" x:Name="img"/>
<dxc:DXElement Grid.Column="0" Grid.Row="1" x:Name="dxview11"/>
<dxc:DXElement Grid.Column="1" Grid.Row="1" x:Name="dxview2d"/>
. . . Where DXElement's declaration and constructor look like this . . .
public class DXElement : FrameworkElement, INotifyPropertyChanged
public DXElement()
{
base.SnapsToDevicePixels = true;
m_renderTimer = new Stopwatch();
m_surface = new DXImageSource();
m_surface.IsFrontBufferAvailableChanged += delegate
{
UpdateReallyLoopRendering();
if (!m_isReallyLoopRendering && m_surface.IsFrontBufferAvailable)
Render();
};
IsVisibleChanged += delegate { UpdateReallyLoopRendering(); };
}
The rest of DXElement is just brief event handlers. Here's one example:
protected override void OnRender(DrawingContext dc){
dc.DrawImage(Surface, new Rect(RenderSize));
}
Notice the "override". I'm assuming that one of the parent classes of DXElement ( FrameworkElement or INotifyPropertyChanged ) are already listening for these events. But what's triggering these events? (e.g., OnRender(), OnLoopRendering(), etc) They seem to be the engine that runs the program. How can I track what causes events like this to fire in a WPF program? If I set a breakpoint at them I see them getting hit, but they're called from the framwework, e.g.,
SharpDX.WPF.dll!SharpDX.WPF.DXElement.OnRender(System.Windows.Media.DrawingContext dc) Line 153 C# PresentationCore.dll!System.Windows.UIElement.Arrange(System.Windows.Rect finalRect) Unknown PresentationFramework.dll!System.Windows.Controls.Grid.ArrangeOverride(System.Windows.Size arrangeSize) Unknown PresentationFramework.dll!System.Windows.FrameworkElement.ArrangeCore(System.Windows.Rect finalRect) Unknown PresentationCore.dll!System.Windows.UIElement.Arrange(System.Windows.Rect finalRect) Unknown PresentationFramework.dll!MS.Internal.Helper.ArrangeElementWithSingleChild(System.Windows.UIElement element, System.Windows.Size arrangeSize) Unknown PresentationFramework.dll!System.Windows.Controls.ContentPresenter.ArrangeOverride(System.Windows.Size arrangeSize) Unknown
... so I don't understand what the program is doing to make these events happen. How do I figure that out? Thanks in advance for any help! (and if you'd like 200 reputation points on Stack Overflow, I've also posted it there with a bonus at http://stackoverflow.com/questions/36651696/need-to-understand-the-event-triggering-in-this-wpf-program )
