//2.[初始化part-3]-通过向canvas中添加一个FontSize大小的弹幕来获取在canvas中显示时的真是尺寸
private void libInit(initCompleteHandler initCompleted)
{
BarrageUIBlock _testBarrage = new BarrageUIBlock();
_testBarrage.Text = "Hello,World!";
_testBarrage.FontFamily = (FontFamily) new FontFamilyConverter().ConvertFromString("Microsoft YaHei");
_testBarrage.Name = "uni_testforheight";
_testBarrage.FontSize = barrage_FontSize;
_testBarrage.FontWeight = FontWeights.Bold;
_testBarrage.Loaded += delegate(object sender, RoutedEventArgs e)
{
calcRow(system_RenderCanvas.Height, _testBarrage.Name, _testBarrage.ActualHeight);
if (system_enableAPCS)
{
preventBarrageCover(initCompleted);
}
else
{
initCompleted();
}
};
system_RenderCanvas.Children.Add(_testBarrage);
system_RenderCanvas.RegisterName(_testBarrage.Name, _testBarrage);
}
//3.[初始化part-3]-辅助函数
private void calcRow(double _renderHeight, string _testTargetName, double _fontHeight)
{
//canvas中移除该元素
BarrageUIBlock _testTargetBarrage = system_RenderCanvas.FindName(_testTargetName) as BarrageUIBlock;
system_RenderCanvas.Children.Remove(_testTargetBarrage);
system_RenderCanvas.UnregisterName(_testTargetName);
_maxRow = (int)(_renderHeight / _fontHeight);
_barrage_rowHeight = (int)_fontHeight;
Console.WriteLine(_renderHeight);
Console.WriteLine(_fontHeight);
Console.WriteLine(_maxRow);
}
//1.生成弹幕
public void createBarrage(string _content, int _targetRow, int _rowHeight, int _fontSize, int _duration, byte _R, byte _G, byte _B, bool _enableShadow)
{
BarrageUIBlock _singleBarrage = new BarrageUIBlock();
_singleBarrage.Text = _content;
_singleBarrage.FontFamily = (FontFamily) new FontFamilyConverter().ConvertFromString("Microsoft YaHei");
_singleBarrage.Name = "uni_" + getRandomString(ra.Next(5, 8));
_singleBarrage.FontSize = _fontSize;
_singleBarrage.SetValue(Canvas.TopProperty, (double)_targetRow * _rowHeight);
_singleBarrage.Fill = new SolidColorBrush(Color.FromRgb(_R, _G, _B));
_singleBarrage.CacheMode = new BitmapCache();
_singleBarrage.FontWeight = FontWeights.Bold;
if (_enableShadow == true)
{
DropShadowEffect _ef = new DropShadowEffect();
_ef.RenderingBias = RenderingBias.Performance;
_ef.Opacity = (double)100;
_ef.ShadowDepth = (double)0;
_ef.BlurRadius = (double)11;
if (_R == 0 && _G == 0 && _B == 0)
{
_ef.Color = Color.FromRgb(255, 255, 255);
}
else
{
_ef.Color = Color.FromRgb(0, 0, 0);
}
_singleBarrage.Effect = _ef;
}
_singleBarrage.Loaded += delegate(object sender, RoutedEventArgs e)
{
doAnimation(_singleBarrage.Name, _duration, _targetRow);//添加动画（弹幕移动）
};
system_RenderCanvas.Children.Add(_singleBarrage);
system_RenderCanvas.RegisterName(_singleBarrage.Name, _singleBarrage);
if (system_enableAPCS)
{
lockRow(_targetRow);//置为忙状态
}
}
//2.添加动画（移动）效果
private void doAnimation(string _targetUniqueName, int _duration, int _row)
{
BarrageUIBlock _targetBarrage = system_RenderCanvas.FindName(_targetUniqueName) as BarrageUIBlock;
double _barrageWidth = _targetBarrage.ActualWidth;
DoubleAnimation _doubleAnimation = new DoubleAnimation(system_RenderCanvas.Width, -_barrageWidth, new Duration(TimeSpan.FromMilliseconds(_duration)), FillBehavior.Stop);
Storyboard _sb = new Storyboard();
Storyboard.SetTarget(_doubleAnimation, _targetBarrage);
Storyboard.SetTargetProperty(_doubleAnimation, new PropertyPath("(Canvas.Left)"));
_sb.Completed += delegate(object sender, EventArgs e) {
removeOutdateBarrage(_targetUniqueName, _row);
};
_sb.Children.Add(_doubleAnimation);
_sb.Begin();
}
//3.移除canvas中已经显示完成的弹幕
private void removeOutdateBarrage(string _targetUniqueName, int _row)
{
BarrageUIBlock ready2remove = system_RenderCanvas.FindName(_targetUniqueName) as BarrageUIBlock;
if (ready2remove != null)
{
system_RenderCanvas.Children.Remove(ready2remove);
system_RenderCanvas.UnregisterName(_targetUniqueName);
ready2remove = null;
if (system_enableAPCS)
{
unlockRow(_row);
}
}
else
{
Console.WriteLine("移除弹幕失败！");
}
}