Windows Presentation Foundation

Find Visual Child

Posted on by coder 
   
 
//http://simpledbbrowser.codeplex.com/
//License:  Microsoft Public License (Ms-PL)  
using System.Diagnostics;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace AWS.Framework.WPF.Utility
{
    public sealed class Helpers
    {
        public static childItem FindVisualChild<childItem>(DependencyObject obj) where childItem : DependencyObject
        {
            for (int i = 0; i <= VisualTreeHelper.GetChildrenCount(obj) - 1; i++)
            {
                DependencyObject child = VisualTreeHelper.GetChild(obj, i);

                if (child != null &amp;&amp; child is childItem)
                    return (childItem)child;
                else
                {
                    childItem childOfChild = FindVisualChild<childItem>(child);

                    if (childOfChild != null)
                        return childOfChild;
                }
            }

            return null;
        }
   }
}

Update Focused Field for FrameworkElement

Posted on by coder 
   
 

//http://simpledbbrowser.codeplex.com/
//License:  Microsoft Public License (Ms-PL)  
using System.Diagnostics;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace AWS.Framework.WPF.Utility
{
    public sealed class Helpers
    {
        #region Constructor

        private Helpers()
        { }

        #endregion // Constructor

        #region Methods


        public static void UpdateFocusedField()
        {
            FrameworkElement fwe = Keyboard.FocusedElement as FrameworkElement;

            if (fwe != null)
            {
                BindingExpression expression = null;

                if (fwe is TextBox)
                    expression = fwe.GetBindingExpression(TextBox.TextProperty);
                // TODO - developers - add more control types here. Won&#039;t be that many.
                // this would include custom TextBox controls or 3rd party TextBox controls

                if (expression != null)
                    expression.UpdateSource();
            }
        }

        #endregion // Methods
    }
}

Change Fill

Posted on by coder 


   
   

<StackPanel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
  xmlns:d="http://schemas.microsoft.com/expression/interactivedesigner/2006"
  mc:Ignorable="d"
  x:Class="PaintDrawExamples.ChangeFill" 
  Width="640" Height="480">

  <StackPanel.Resources>
    <Storyboard x:Key="OnLoaded"/>
  </StackPanel.Resources>

  <StackPanel.Triggers>
    <EventTrigger RoutedEvent="FrameworkElement.Loaded">
      <BeginStoryboard x:Name="OnLoaded_BeginStoryboard" Storyboard="{DynamicResource OnLoaded}"/>
    </EventTrigger>
  </StackPanel.Triggers>
  <Path d:LastTangent="0,0" Width="300" Height="82" x:Name="myShape" RenderTransformOrigin="0.5,0.5" Stretch="Fill" Data="M268,209 L134,209 147,249 250,290 z">
    <Path.RenderTransform>
      <TransformGroup>
        <TranslateTransform X="0" Y="0"/>
        <ScaleTransform ScaleX="1" ScaleY="1"/>
        <SkewTransform AngleX="0" AngleY="0"/>
        <RotateTransform Angle="0"/>
        <TranslateTransform X="0" Y="0"/>
      </TransformGroup>
    </Path.RenderTransform>
    <Path.Fill>
      <LinearGradientBrush StartPoint="0,0.5" EndPoint="1,0.5">
        <GradientStop Color="#11111111" Offset="0"/>
        <GradientStop Color="#FFFFFFFF" Offset="1"/>
      </LinearGradientBrush>
    </Path.Fill>
  </Path>
</StackPanel>
//File:Window.xaml.cs

using System;
using System.IO;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Navigation;

namespace PaintDrawExamples
{
  public partial class ChangeFill
  {
    public ChangeFill()
    {
      this.InitializeComponent();
      this.MouseDown += new MouseButtonEventHandler(MouseDownHandler);
    }

    private void MouseDownHandler(object sender, MouseButtonEventArgs e)
    {
      LinearGradientBrush brush = (LinearGradientBrush)this.myShape.Fill;
      brush.GradientStops[0].Color = Color.FromRgb(0,0,0);
    }
  }
}

Change the Visibility property of a UIElement.

Posted on by coder 


   
   

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="Visibility_Layout_Samp.Window1"
    Title="UIELement.Visibility Sample">
      <DockPanel>
            <StackPanel DockPanel.Dock="Left">
                <Button Name="btn1" Height="25" Click="contentVis">Visibility="Visible"</Button>
                <Button Name="btn2" Height="25" Click="contentHid">Visibility="Hidden"</Button>
                <Button Name="btn3" Height="25" Click="contentCol">Visibility="Collapsed"</Button> 
            </StackPanel>    
            <StackPanel HorizontalAlignment="Center">
                <TextBox Name="tb1" Width="100" Height="50">A TextBox</TextBox>
                <TextBlock Name="txt1" TextWrapping="Wrap" FontSize="14"/>
            </StackPanel>
        </DockPanel>
</Window>

//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;

namespace Visibility_Layout_Samp
{
  public partial class Window1 : Window
  {
        public void contentVis(object sender, RoutedEventArgs e)
        {
            tb1.Visibility = System.Windows.Visibility.Visible;
            txt1.Text = "Visibility is now set to Visible.";
        }

        public void contentHid(object sender, RoutedEventArgs e)
        {
            tb1.Visibility = System.Windows.Visibility.Hidden;
            txt1.Text = "Visibility is now set to Hidden.";
        }

        public void contentCol(object sender, RoutedEventArgs e)
        {
            tb1.Visibility = System.Windows.Visibility.Collapsed;
            txt1.Text = "Visibility is now set to Collapsed.";
        }
    }
}

Changing graphical elements

Posted on by coder 


   
   

<Window x:Class="ChangeItem.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Change Item">

  <Canvas x:Name="mainCanvas">
    <Ellipse Canvas.Left="10" Canvas.Top="30" Fill="Indigo" Width="40" Height="20" />
    <Ellipse Canvas.Left="20" Canvas.Top="40" Fill="Blue" Width="40" Height="20" />
    <Ellipse Canvas.Left="30" Canvas.Top="50" Fill="Cyan" Width="40" Height="20" />
    <Ellipse Canvas.Left="40" Canvas.Top="60" Fill="LightGreen" Width="40" Height="20" />
    <Ellipse Canvas.Left="50" Canvas.Top="70" Fill="Yellow" Width="40" Height="20" />
  </Canvas>
</Window>
//File:Window.xaml.cs
using System.Windows;
using System.Windows.Shapes;

namespace ChangeItem
{
    public partial class MainWindow : Window
    {
        public MainWindow(): base()
        {
            InitializeComponent();
            mainCanvas.MouseLeftButtonDown += OnClick;
        }

        private void OnClick(object sender, RoutedEventArgs e)
        {
            Ellipse r = e.Source as Ellipse;
            if (r != null)
            {
                r.Width += 10;
            }
        }
    }
}

Change control background in mouse enter and leave

Posted on by coder 


   
   


<Window x:Class="Styles.EventSetter"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="EventSetter" Height="300" Width="300">
  <Window.Resources>
    <Style x:Key="MouseOverHighlightStyle">
      <Setter Property="TextBlock.Padding" Value="5"/>
      <EventSetter Event="FrameworkElement.MouseEnter" Handler="element_MouseEnter" />
      <EventSetter Event="FrameworkElement.MouseLeave" Handler="element_MouseLeave" />
    </Style>
  </Window.Resources>
  
  <StackPanel>
    <TextBlock Style="{StaticResource MouseOverHighlightStyle}">Hover over me.</TextBlock>
    <TextBlock Padding="5">asdf</TextBlock>
    <TextBlock Style="{StaticResource MouseOverHighlightStyle}">Hover over me.</TextBlock>
  </StackPanel>
</Window>
//File:Window.xaml.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace Styles
{
    public partial class EventSetter : System.Windows.Window
    {
        public EventSetter()
        {
            InitializeComponent();
        }
        private void element_MouseEnter(object sender, MouseEventArgs e)
        {
            ((TextBlock)sender).Background = new SolidColorBrush(Colors.LightGoldenrodYellow);
        }
        private void element_MouseLeave(object sender, MouseEventArgs e)
        {
            ((TextBlock)sender).Background = null;
        }
    }
}

Print Visual(Canvas)

Posted on by coder 


   
   
<Window x:Class="Printing.PrintVisual"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="PrintVisual" Height="259" Width="282">
    <StackPanel>
      <Canvas Name="canvas">
        <TextBlock Canvas.Top="50" Canvas.Left="20" FontSize="25" FontWeight="Bold">Hello There</TextBlock>

        <Path Fill="Yellow" Stroke="Blue" Margin="5" Canvas.Top="10" Canvas.Left="10" >
          <Path.Data>
            <GeometryGroup>
              <RectangleGeometry Rect="0 0 100 100"></RectangleGeometry>
              <EllipseGeometry Center="50 50" RadiusX="35" RadiusY="25"></EllipseGeometry>
            </GeometryGroup>
          </Path.Data>
        </Path>
      </Canvas>
      <Button Grid.Row="3" Click="cmdPrint_Click">Print</Button>
    </StackPanel>
</Window>

//File:Window.xaml.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace Printing
{
    public partial class PrintVisual : System.Windows.Window
    {

        public PrintVisual()
        {
            InitializeComponent();
        }

        private void cmdPrint_Click(object sender, RoutedEventArgs e)
        {
            PrintDialog printDialog = new PrintDialog();
            
            if (printDialog.ShowDialog() == true)
            {             
                double zoom = 30;                 

                canvas.Background = Brushes.LightSteelBlue;                                    
                    
                canvas.LayoutTransform = new ScaleTransform(zoom / 100, zoom / 100);

                Size pageSize = new Size(printDialog.PrintableAreaWidth - 20, printDialog.PrintableAreaHeight - 20);
                    
                canvas.Measure(pageSize);
                canvas.Arrange(new Rect(10, 10, pageSize.Width, pageSize.Height));

                printDialog.PrintVisual(canvas, "A Scaled Drawing");

                canvas.Background = null;
                canvas.LayoutTransform = null;                        
            }
        }
    }
}