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optimize<Avatar>: create formatted text only if fallback label changed

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This commit is contained in:
leo 2021-05-17 17:38:40 +08:00
parent 5b3b551b84
commit a46fceeea6
1 changed files with 33 additions and 18 deletions
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51
src/Views/Controls/Avatar.cs
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@ -61,7 +61,7 @@ namespace SourceGit.Views.Controls {
"FallbackLabel",
typeof(string),
typeof(Avatar),
new PropertyMetadata("?"));
new PropertyMetadata("?", OnFallbackLabelChanged));
/// <summary>
/// 下载头像失败时显示的Label属性
@ -75,6 +75,9 @@ namespace SourceGit.Views.Controls {
private static Dictionary<string, BitmapImage> loaded = new Dictionary<string, BitmapImage>();
private static Task loader = null;
private int colorIdx = 0;
private FormattedText label = null;
/// <summary>
/// 渲染实现
/// </summary>
@ -82,17 +85,7 @@ namespace SourceGit.Views.Controls {
protected override void OnRender(DrawingContext dc) {
base.OnRender(dc);
if (Source == null) {
var placeholder = FallbackLabel.Length > 0 ? FallbackLabel.Substring(0, 1) : "?";
var formatted = new FormattedText(
placeholder,
CultureInfo.CurrentCulture,
FlowDirection.LeftToRight,
new Typeface(new FontFamily("Consolas"), FontStyles.Normal, FontWeights.Normal, FontStretches.Normal),
Width * 0.65,
Brushes.White,
VisualTreeHelper.GetDpi(this).PixelsPerDip);
if (Source == null && label != null) {
var corner = Math.Max(2, Width / 16);
var offsetX = (double)0;
if (HorizontalAlignment == HorizontalAlignment.Right) {
@ -101,16 +94,38 @@ namespace SourceGit.Views.Controls {
offsetX = Width * 0.5;
}
var chars = placeholder.ToCharArray();
var sum = 0;
foreach (var ch in chars) sum += Math.Abs(ch);
Brush brush = BACKGROUND_BRUSHES[sum % BACKGROUND_BRUSHES.Length];
Brush brush = BACKGROUND_BRUSHES[colorIdx];
dc.DrawRoundedRectangle(brush, null, new Rect(-Width * 0.5 + offsetX, -Height * 0.5, Width, Height), corner, corner);
dc.DrawText(formatted, new Point(formatted.Width * -0.5 + offsetX, formatted.Height * -0.5));
dc.DrawText(label, new Point(label.Width * -0.5 + offsetX, label.Height * -0.5));
}
}
/// <summary>
/// 显示文本变化时触发
/// </summary>
/// <param name="d"></param>
/// <param name="e"></param>
private static void OnFallbackLabelChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) {
Avatar a = d as Avatar;
if (a == null) return;
var placeholder = a.FallbackLabel.Length > 0 ? a.FallbackLabel.Substring(0, 1) : "?";
a.colorIdx = 0;
a.label = new FormattedText(
placeholder,
CultureInfo.CurrentCulture,
FlowDirection.LeftToRight,
new Typeface(new FontFamily("Consolas"), FontStyles.Normal, FontWeights.Normal, FontStretches.Normal),
a.Width * 0.65,
Brushes.White,
VisualTreeHelper.GetDpi(a).PixelsPerDip);
var chars = placeholder.ToCharArray();
foreach (var ch in chars) a.colorIdx += Math.Abs(ch);
a.colorIdx = a.colorIdx % BACKGROUND_BRUSHES.Length;
}
/// <summary>
/// 邮件变化时触发
/// </summary>