Create a Zoomable Canvas Control : Canvas « Windows Presentation Foundation « C# / C Sharp





Create a Zoomable Canvas Control

Create a Zoomable Canvas Control
  
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:WpfApplication1="clr-namespace:WpfApplication1;assembly="
   Title="WPF" Height="300" Width="300" >

    <Window.Resources>
        <Style TargetType="Button">
            <Setter Property="Width" Value="Auto" />
            <Setter Property="Height" Value="24" />
        </Style>
    </Window.Resources>
    <DockPanel>
        <Slider DockPanel.Dock="Bottom" x:Name="zoomSlider" Minimum="0.1" Maximum="5" Value="1"/>
        <ScrollViewer VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto">
            <WpfApplication1:ZoomableCanvasControl x:Name="zoomControl">
                <Canvas.LayoutTransform>
                    <ScaleTransform ScaleX="{Binding Path=Value, ElementName=zoomSlider}"
                                    ScaleY="{Binding Path=Value, ElementName=zoomSlider}"/>
                </Canvas.LayoutTransform>
                <Rectangle Canvas.Top="0" Canvas.Left="0" StrokeThickness="2" Stroke="Red" Width="50" Height="50"/>
                <Rectangle Canvas.Top="50" Canvas.Left="50" StrokeThickness="2" Stroke="Blue" Width="150" Height="150"/>
                <Rectangle Canvas.Top="200" Canvas.Left="200" StrokeThickness="2" Stroke="Green" Width="200" Height="200"/>
            </WpfApplication1:ZoomableCanvasControl>
        </ScrollViewer>

    </DockPanel>
</Window>
//File:Window.xaml.cs

using System.Windows;
using System;
using System.Windows;
using System.Windows.Controls;
namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
    }

    public class ZoomableCanvasControl : Canvas
    {
        static ZoomableCanvasControl()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(ZoomableCanvasControl),new FrameworkPropertyMetadata(typeof(ZoomableCanvasControl)));
        }

        protected override Size MeasureOverride(Size constraint)
        {
            double bottomMost = 0d;
            double rightMost = 0d;

            foreach(object obj in Children)
            {
                FrameworkElement child = obj as FrameworkElement;

                if(child != null)
                {
                    child.Measure(constraint);

                    bottomMost = Math.Max(bottomMost,GetTop(child) +child.DesiredSize.Height);
                    rightMost = Math.Max(rightMost,GetLeft(child) +child.DesiredSize.Width);
                }
            }
            return new Size(rightMost, bottomMost);
        }
    }
}

   
    
  










Related examples in the same category

1.Nested CanvasNested Canvas
2.Positioning on a CanvasPositioning on a Canvas
3.Canvas without ViewboxCanvas without Viewbox
4.Animation target Canvas Left, TopAnimation target Canvas Left, Top
5.Pixel Not SnappedPixel Not Snapped
6.Rotate ShapeRotate Shape
7.Canvas dependantCanvas dependant
8.Simple Canvas LayoutSimple Canvas Layout
9.Canvas.SetTopCanvas.SetTop
10.Canvas.SetBottomCanvas.SetBottom
11.Canvas.SetRightCanvas.SetRight
12.Canvas PreviewMouseDown action and MouseDown actionCanvas PreviewMouseDown action and MouseDown action
13.Create a Scrollable Canvas ControlCreate a Scrollable Canvas Control
14.Set control position for CanvasSet control position for Canvas
15.Canvas Positioning Properties SampleCanvas Positioning Properties Sample
16.Get position on a Canvas with Canvas.GetLeftGet position on a Canvas with Canvas.GetLeft