FullScreenButton.xaml

 前办场

<UserControl x:Class="ComputerDropDragControl.FullScreenButton"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" HorizontalAlignment="Left">
        <Button Content="全屏"  x:Name="btnFullScreen" Click="btnFullScreen_Click"
                Width="53" Height="30"
                Margin="20,10,0,0" >
        </Button>
    </Grid>
</UserControl>

 

后半厂

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Interop;//为什么要引入这个命名空间呢？Pay Attention to it.

namespace ComputerDropDragControl
{
    public partial class FullScreenButton : UserControl
    {
        bool expand = false;
        public FullScreenButton(UIElement uc)
        {
            InitializeComponent();

            BackElement = uc;

            Application.Current.Host.Content.FullScreenChanged += new EventHandler(Content_FullScreenChanged);
        }

        #region <<控件事件>>

        #region <<全屏相关事件>>

        private void btnFullScreen_Click(object sender, RoutedEventArgs e)
        {
            FullScreen();
        }

        private void FullScreen()
        {
            Content contentObject = Application.Current.Host.Content;

            contentObject.IsFullScreen = !contentObject.IsFullScreen;
        }

        private void Content_FullScreenChanged(Object sender, EventArgs e)
        {
            Content contentObject = Application.Current.Host.Content;
            if (contentObject.IsFullScreen)
            {
                Content_Resized(sender, e, true);
                btnFullScreen.Background = new SolidColorBrush(Colors.Orange);
                btnFullScreen.Content = "退出全屏";
            }
            else
            {
                Content_Resized(sender, e, false);
                btnFullScreen.ClearValue(BackgroundProperty);
                btnFullScreen.Content = "全 屏";
            }
        }

        void Content_Resized(object sender, EventArgs e, bool fullScreen)
        {
            //double currentWidth = Application.Current.Host.Content.ActualWidth;
            //double currentHeight = Application.Current.Host.Content.ActualHeight;
            //uniformScaleAmount = Math.Min((currentWidth / width), (currentHeight / height));
            //stackFather.Width = stackFather.ActualWidth * uniformScaleAmount;
            //stackFather.Height = stackFather.ActualHeight * uniformScaleAmount;
            //RootLayoutScaleTransform.ScaleX = uniformScaleAmount;
            //RootLayoutScaleTransform.ScaleY = uniformScaleAmount;
            //RootLayoutScaleTransformOne.ScaleX = uniformScaleAmount;
            //RootLayoutScaleTransformOne.ScaleY = uniformScaleAmount;
            ScrollViewer scrollOne = (ScrollViewer)BackElement;
            if (fullScreen)
            {
                scrollOne.Width = Application.Current.Host.Content.ActualWidth;
                scrollOne.Height = Application.Current.Host.Content.ActualHeight;
                //this.scrollOne.Height = 700;
            }
            else
            {
                scrollOne.Width = 780;
                scrollOne.Height = 720;
            }

        }
        #endregion

        #endregion

        public UIElement BackElement { get; set; }

        public double scrollWidth { get; set; }

    }
}