方法 : タイムラインの速度を変更せずにクロックの速度を変更する
更新 : 2007 年 11 月
ClockController オブジェクトの SpeedRatio プロパティを使用すると、クロックの Timeline の SpeedRatio を変更せずに Clock の速度を変更できます。次の例では、クロックの SpeedRatio を対話的に変更するために、ClockController を使用しています。CurrentGlobalSpeedInvalidated イベントと、クロックの CurrentGlobalSpeed プロパティを使用して、クロックの対話型 SpeedRatio が変更されるたびに、クロックの現在のグローバル速度を表示します。
使用例
/*
This example shows how to interactively control
the speed of a clock
*/
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;
using System.Windows.Media.Animation;
namespace Microsoft.Samples.Animation.TimingBehaviors
{
public class ClockControllerSpeedRatioExample : Page
{
private AnimationClock myControllableClock;
private Button speedRatioButton;
private TextBox speedRatioSettingTextBox;
private double doubleParseResult = 1;
private TextBlock currentGlobalSpeedTextBlock;
public ClockControllerSpeedRatioExample()
{
StackPanel mainPanel = new StackPanel();
// Create a rectangle to animate.
Rectangle animatedRectangle = new Rectangle();
animatedRectangle.Width = 100;
animatedRectangle.Height = 100;
animatedRectangle.Fill = Brushes.Orange;
mainPanel.Children.Add(animatedRectangle);
// Create a DoubleAnimation to
// animate its width.
DoubleAnimation widthAnimation =
new DoubleAnimation(
100,
500,
new Duration(TimeSpan.FromSeconds(5)));
//widthAnimation.RepeatBehavior = RepeatBehavior.Forever;
widthAnimation.AutoReverse = true;
widthAnimation.SpeedRatio = 0.5;
// Create a clock from the animation.
myControllableClock = widthAnimation.CreateClock();
// Apply the clock to the rectangle's Width property.
animatedRectangle.ApplyAnimationClock(
Rectangle.WidthProperty, myControllableClock);
//
// Create some controls the enable the user to
// interactively control the SpeedRatio of the clock.
//
StackPanel speedRatioDetailsPanel = new StackPanel();
speedRatioDetailsPanel.Margin = new Thickness(0,20,0,20);
speedRatioDetailsPanel.Orientation = Orientation.Horizontal;
Label speedRatioLabel = new Label();
speedRatioLabel.Content = "Speed Ratio:";
speedRatioDetailsPanel.Children.Add(speedRatioLabel);
// Create a text box so that the user can
// specify the amount by which to seek.
speedRatioSettingTextBox = new TextBox();
speedRatioSettingTextBox.Text =
myControllableClock.Controller.SpeedRatio.ToString();
speedRatioSettingTextBox.VerticalAlignment = VerticalAlignment.Top;
speedRatioSettingTextBox.TextChanged +=
new TextChangedEventHandler(seekAmountTextBox_TextChanged);
speedRatioDetailsPanel.Children.Add(speedRatioSettingTextBox);
// Create a button to apply SpeedRatio changes.
speedRatioButton = new Button();
speedRatioButton.Content = "Apply Speed Ratio";
speedRatioButton.Click += new RoutedEventHandler(speedRatioButton_Clicked);
speedRatioDetailsPanel.Children.Add(speedRatioButton);
mainPanel.Children.Add(speedRatioDetailsPanel);
// Display the clock's global speed information.
Label myLabel = new Label();
myLabel.Content = "CurrentGlobalSpeed ";
mainPanel.Children.Add(myLabel);
currentGlobalSpeedTextBlock = new TextBlock();
currentGlobalSpeedTextBlock.Text =
myControllableClock.CurrentGlobalSpeed.ToString();
mainPanel.Children.Add(currentGlobalSpeedTextBlock);
// List for speed changes.
myControllableClock.CurrentGlobalSpeedInvalidated +=
new EventHandler(myControllableClock_currentGlobalSpeedInvalidated);
this.Content = mainPanel;
}
// Updates the clock's SpeedRatio.
private void speedRatioButton_Clicked(object sender, RoutedEventArgs e)
{
// This statement triggers a CurrentGlobalSpeedInvalidated
// event.
myControllableClock.Controller.SpeedRatio = doubleParseResult;
}
// Displays the current global speed.
private void myControllableClock_currentGlobalSpeedInvalidated(object sender, EventArgs e)
{
currentGlobalSpeedTextBlock.Text =
myControllableClock.CurrentGlobalSpeed.ToString()
+ " Event triggered at: "
+ DateTime.Now.ToString();
}
// Verifies that speedRatioSettingTextBox has valid text content.
// If it doesn't, the speedRatioButton is disabled.
private void seekAmountTextBox_TextChanged(object sender, TextChangedEventArgs e)
{
TextBox theTextBox = (TextBox)e.Source;
if (theTextBox.Text == null || theTextBox.Text.Length < 1
|| Double.TryParse(theTextBox.Text,
System.Globalization.NumberStyles.Any,
null, out doubleParseResult) == false)
speedRatioButton.IsEnabled = false;
else
speedRatioButton.IsEnabled = true;
}
}
}