Weird MetroProgressBar animation with IsIndeterminate=true #2591
Description
What steps will reproduce this issue?
This happens after upgrading from 1.3.0-ALPHA155 to 1.3.0-ALPHA178
I use the MetroProgressBar in a custom control to make a busy indicator.
It only occurs when the MetroProgressBar's IsIndeterminate=true and Visibility is not Visible at first.
It is fine if the bar's Visibility is Visible at first.
The Issue's Sample Code
https://github.com/p76984275/ProgressBarIssue
Normal (1.3.0-ALPHA155)
The animation is normal no matter at first time or not.
Weird (1.3.0-ALPHA178)
When the bar becomes visible at first time, the animation starts with a delay and the width is wrong. But after that the animation keeps normal as above. Only at first time this issue happens.
Expected outcome
I found that at first time, bar.ActualSize() will return 0 with Weird (1.3.0-ALPHA178) but the right width with Normal (1.3.0-ALPHA155).
It works as before if changing bar.Invoke(resetAction); back to bar.Dispatcher.BeginInvoke(DispatcherPriority.Background, resetAction);
I'm not sure if there is any concern to use that workaround or maybe there are some mistakes in my custom control. Would you please give me some advice? Many thanks.
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Environment
- MahApps.Metro 1.3.0-ALPHA178
- Windows 7 x64
- Visual Studio 2015
- .NET Framework 4.5.2