Panel.ZIndex Attached Property

Definition

Namespace:

System.Windows.Controls

Assembly:

PresentationFramework.dll

Gets or sets a value that represents the order on the z-plane in which an element appears.

see GetZIndex, and SetZIndex

see GetZIndex, and SetZIndex

see GetZIndex, and SetZIndex

Examples

The following example demonstrates how to set the value of the ZIndex property by using Extensible Application Markup Language (XAML) and code.

// Create the application's main window
mainWindow = gcnew Window();
mainWindow->Title = "Canvas ZIndex Sample";

// Create the Canvas
myCanvas = gcnew Canvas();

// Create the child Rectangle elements
myRectangle1 = gcnew Rectangle();
myRectangle2 = gcnew Rectangle();
myRectangle3 = gcnew Rectangle();
myRectangle4 = gcnew Rectangle();
myRectangle5 = gcnew Rectangle();
myRectangle6 = gcnew Rectangle();

// Set properties on the Rectangle elements
Canvas::SetTop(myRectangle1, 100);
Canvas::SetLeft(myRectangle1, 100);
Canvas::SetZIndex(myRectangle1, 3);
myRectangle1->Fill = Brushes::Blue;
myRectangle1->Width = 100;
myRectangle1->Height = 100;

Canvas::SetTop(myRectangle2, 150);
Canvas::SetLeft(myRectangle2, 150);
Canvas::SetZIndex(myRectangle2, 1);
myRectangle2->Fill = Brushes::Yellow;
myRectangle2->Width = 100;
myRectangle2->Height = 100;

Canvas::SetTop(myRectangle3, 200);
Canvas::SetLeft(myRectangle3, 200);
Canvas::SetZIndex(myRectangle3, 2);
myRectangle3->Fill = Brushes::Green;
myRectangle3->Width = 100;
myRectangle3->Height = 100;

Canvas::SetTop(myRectangle4, 300);
Canvas::SetLeft(myRectangle4, 200);
Canvas::SetZIndex(myRectangle4, 1);
myRectangle4->Fill = Brushes::Green;
myRectangle4->Width = 100;
myRectangle4->Height = 100;

Canvas::SetTop(myRectangle5, 350);
Canvas::SetLeft(myRectangle5, 150);
Canvas::SetZIndex(myRectangle5, 3);
myRectangle5->Fill = Brushes::Yellow;
myRectangle5->Width = 100;
myRectangle5->Height = 100;

Canvas::SetTop(myRectangle6, 400);
Canvas::SetLeft(myRectangle6, 100);
Canvas::SetZIndex(myRectangle6, 2);
myRectangle6->Fill = Brushes::Blue;
myRectangle6->Width = 100;
myRectangle6->Height = 100;

// Add the Rectangles to the Canvas' Children collection
myCanvas->Children->Add(myRectangle1);
myCanvas->Children->Add(myRectangle2);
myCanvas->Children->Add(myRectangle3);
myCanvas->Children->Add(myRectangle4);
myCanvas->Children->Add(myRectangle5);
myCanvas->Children->Add(myRectangle6);

// Add the Canvas as the Content of the parent Window Object
mainWindow->Content = myCanvas;
mainWindow->Show();

// Create the application's main window
mainWindow = new Window ();
mainWindow.Title = "Canvas ZIndex Sample";

// Create the Canvas
myCanvas = new Canvas();

// Create the child Rectangle elements
myRectangle1 = new Rectangle();
myRectangle2 = new Rectangle();
myRectangle3 = new Rectangle();
myRectangle4 = new Rectangle();
myRectangle5 = new Rectangle();
myRectangle6 = new Rectangle();

// Set properties on the Rectangle elements
Canvas.SetTop(myRectangle1, 100);
Canvas.SetLeft(myRectangle1, 100);
Canvas.SetZIndex(myRectangle1, 3);
myRectangle1.Fill = Brushes.Blue;
myRectangle1.Width = 100;
myRectangle1.Height = 100;

Canvas.SetTop(myRectangle2, 150);
Canvas.SetLeft(myRectangle2, 150);
Canvas.SetZIndex(myRectangle2, 1);
myRectangle2.Fill = Brushes.Yellow;
myRectangle2.Width = 100;
myRectangle2.Height = 100;

Canvas.SetTop(myRectangle3, 200);
Canvas.SetLeft(myRectangle3, 200);
Canvas.SetZIndex(myRectangle3, 2);
myRectangle3.Fill = Brushes.Green;
myRectangle3.Width = 100;
myRectangle3.Height = 100;

Canvas.SetTop(myRectangle4, 300);
Canvas.SetLeft(myRectangle4, 200);
Canvas.SetZIndex(myRectangle4, 1);
myRectangle4.Fill = Brushes.Green;
myRectangle4.Width = 100;
myRectangle4.Height = 100;

Canvas.SetTop(myRectangle5, 350);
Canvas.SetLeft(myRectangle5, 150);
Canvas.SetZIndex(myRectangle5, 3);
myRectangle5.Fill = Brushes.Yellow;
myRectangle5.Width = 100;
myRectangle5.Height = 100;

Canvas.SetTop(myRectangle6, 400);
Canvas.SetLeft(myRectangle6, 100);
Canvas.SetZIndex(myRectangle6, 2);
myRectangle6.Fill = Brushes.Blue;
myRectangle6.Width = 100;
myRectangle6.Height = 100;

// Add the Rectangles to the Canvas' Children collection
myCanvas.Children.Add(myRectangle1);
myCanvas.Children.Add(myRectangle2);
myCanvas.Children.Add(myRectangle3);
myCanvas.Children.Add(myRectangle4);
myCanvas.Children.Add(myRectangle5);
myCanvas.Children.Add(myRectangle6);

// Add the Canvas as the Content of the parent Window Object
mainWindow.Content = myCanvas;
mainWindow.Show ();

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" WindowTitle="ZIndex Sample">
  <Canvas>
    <Rectangle Canvas.ZIndex="3" Width="100" Height="100" Canvas.Top="100" Canvas.Left="100" Fill="blue"/>
    <Rectangle Canvas.ZIndex="1" Width="100" Height="100" Canvas.Top="150" Canvas.Left="150" Fill="yellow"/>
    <Rectangle Canvas.ZIndex="2" Width="100" Height="100" Canvas.Top="200" Canvas.Left="200" Fill="green"/>

    <!-- Reverse the order to illustrate z-index property -->

    <Rectangle Canvas.ZIndex="1" Width="100" Height="100" Canvas.Top="300" Canvas.Left="200" Fill="green"/>
    <Rectangle Canvas.ZIndex="3" Width="100" Height="100" Canvas.Top="350" Canvas.Left="150" Fill="yellow"/>
    <Rectangle Canvas.ZIndex="2" Width="100" Height="100" Canvas.Top="400" Canvas.Left="100" Fill="blue"/>
  </Canvas>
</Page>

Remarks

The greater the value of a given element, the more likely the element is to appear in the foreground. Likewise, if an element has a relatively low value, the element will likely appear in the background. For example, an element that has a value of 5 will appear above an element that has a value of 4, which in turn will appear above an element that has a value of 3, and so on. Negative values are allowed, and they continue this precedence pattern.

Members of a Children collection that have equal ZIndex values are rendered in the order in which they appear in the visual tree. You can determine the index position of a child by iterating the members of the Children collection.

Dependency Property Information

Identifier field	ZIndexProperty
Metadata properties set to true	None